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Herein we study the economic performance of hydrochar and synthetic natural gas co-production from olive tree pruning. The process entails a combination of hydrothermal carbonization and methanation. In a previous work, we evidenced that standalone hydrochar production via HTC results unprofitable. Hence, we propose a step forward on the process design by implementing a methanation, adding value to the gas effluent in an attempt to boost the overall process techno-economic aspects. Three different plant capacities were analyzed (312.5, 625 and 1250 kg/hr). The baseline scenarios showed that, under the current circumstances, our circular economy strategy in unprofitable. An analysis of the revenues shows that hydrochar selling price have a high impact on NPV and subsidies for renewable coal production could help to boost the profitability of the process. On the contrary, the analysis for natural gas prices reveals that prices 8 times higher than the current ones in Spain must be achieved to reach profitability. This seems unlikely even under the presence of a strong subsidy scheme. The costs analysis suggests that a remarkable electricity cost reduction or electricity consumption of the HTC stage could be a potential strategy to reach profitability scenarios. Furthermore, significant reduction of green hydrogen production costs is deemed instrumental to improve the economic performance of the process. These results show the formidable techno-economic challenge that our society faces in the path towards circular economy societies. [ABSTRACT FROM AUTHOR]

Repurposing agricultural and forestry by-products not only is beneficial for the environment but also follows the principles of the circular economy. In southeastern Spain, the Canary Island palm tree (Phoenix canariensis W.) is widely used in urban landscapes. Plantations affected by the red weevil, a pest, generate an abundance of plant waste that must be crushed and transferred to authorized landfills. The aim of this study was to manufacture boards using particles from trunks of the Canary Island palm tree without adding any binders in order to obtain an ecological and fire-resistant product. In order to manufacture the boards, three particle sizes (<0.25, 0.25–1, and 1–2 mm), a temperature of 110 °C, a pressure of 2.6 MPa, and a pressing time of 7 min were used. The boards were pressed in a hot plate press for 7 min up to four times (7 min, 7 + 7 min, 7 + 7 + 7 min, and 7 + 7 + 7 + 7 min). The resulting boards showed good thermal performance, and the board´s reaction-to-fire performance was classified as Bd0 (an Fs value of 70.3 mm). This study also showed that boards with a particle size smaller than 0.25 mm that underwent four pressing cycles of 7 min each in the press can be categorized as grade P2 according to the European Standards (MOR of 20 N/mm2, MOE of 2589.8 N/mm2, and IB of 0.74 N/mm2). Therefore, these manufactured particleboards could be used as a flame-retardant material for the interior enclosures of buildings (vertical and horizontal) without the need for coatings. [ABSTRACT FROM AUTHOR]

Circular start-ups (CSUs) are gaining popularity to radically rethink the linear resource flows of global production systems and adopt ambitious approaches towards a circular economy from inception. For CSUs, the institutional environment is particularly relevant; this is because the complex nature of sustainability challenges requires a deep engagement with institutions to drive transitions from linear to circular practices. This article analyses how and why institutional factors influence CSUs in the highly entrepreneurial region of Catalonia in Spain. Based on a multiple case study, our findings demonstrate that CSUs are affected by informal institutions through founder motivations, their ability to create opportunities and social values. Formal institutions influence CSUs regarding the previous experience of founders, accessible ecosystem actors and supportive laws and regulations. These findings are important for effective policymaking to develop adequate support mechanisms and understand the particular challenges and opportunities CSUs face compared to traditional start-ups. [ABSTRACT FROM AUTHOR]

• Significant reduction (18.44%) in overall Spanish GHG emissions from 2008 to 2018, highlighting some differences depending on the considered phase of the crisis. • The total intensity effect has been noticeable negative, especially in Agriculture, Transport, and Other Services. • The total carbonization effect has contributed to increase GHG emissions by 5.86%, being particularly negative in the case of Industry. • Per capita production effect was strongly negative in Industry and slightly positive in the rest of the economic sectors. • R&D, more eco-friendly technologies, green energies, circular economy and consumer green attitudes: the best strategies to reduce GHG emissions. The reduction of GHG emissions to reverse the greenhouse effect is one of the main challenges in this century. In this paper we pursue two objectives. First, we analyze the evolution of GHG emissions in Spain in 2008–2018, at both the global and sectoral levels, with the variation in emissions decomposed into a set of determining factors. Second, we propose several actions specifically oriented to more tightly controlling the level of emissions. Our results showed a remarkable reduction (18.44%) in GHG emissions, mainly due to the intensity effect, but also to the production-per-capita effect. We detected somewhat different patterns among the various sectors analyzed. While the intensity effect was the most influential one in the agricultural, transport, and others sectors, the production-per-capita effect was predominant in the case of industry. The carbonization effect was revealed as crucial in the commerce sector. The above findings highlight the importance of the energy efficiency measures taken in recent years in the Spanish economy, also pointing to the need to deepen those strategies and to propose new measures that entail greater efficiency in emissions. Additional efforts in areas like innovation, R&D, diffusion of more eco-friendly technologies, and a greater use of greener energies all prove to be essential reduction actions to fight the greenhouse effect. [ABSTRACT FROM AUTHOR]

• Community composting was systematically studied in terms of atmospheric emissions. • Ammonia, methane, nitrous oxide, VOC and odours were measured in several sites. • Community compost presents a good quality, especially in terms of stability. • VOC families were diverse, although terpenes were the predominant compounds. • The age of the material and turning dramatically affects gaseous emissions. Composting has demonstrated to be an effective and sustainable technology to valorise organic waste in the framework of circular economy, especially for biowaste. Composting can be performed in various technological options, from full-scale plants to community or even individual composters. However, there is scarce scientific information about the potential impact of community composting referred to gaseous emissions. This work examines the emissions of methane and nitrous oxide as main GHG, ammonia, VOC and odours from different active community composting sites placed in Spain, treating kitchen, leftovers and household biowaste. Expectedly, the gaseous emissions have an evident relation with the composting progress, represented mainly by its decrease as temperature or biological activity decreases. GHG and odour emission rates ranged from 5.3 to 815.2 mg CO 2eq d-1 kg-1VS and from 69.8 to 1088.5 ou d-1 kg-1VS, respectively, generally being lower than those find in open-air full-scale composting. VOC characterization from the community composting gaseous emissions showed a higher VOC families' distribution in the emissions from initial composting phases, even though terpenes such as limonene, α-pinene and β-pinene were the most abundant VOC along the composting process occurring in the different sites studied. The results presented in this study can be the basis to evaluate systematically and scientifically the numerous current projects for a worldwide community composting implementation in decentralised biowaste management schemes. [ABSTRACT FROM AUTHOR]

The addition of ground olive stones in the manufacture of mortar bricks reduces their thermal conductivity coefficient and increases heat exchange insulation. So, it can improve energy efficiency and reduce the energy demand of buildings. This research analyzes, from other points of view, the economic, social and environmental impacts of the doping of GERO mortar bricks with ground olive stone in a percentage between 5% and 15% by volume of fine aggregate for use in building construction. The study focuses mainly on the region of Andalusia, Spain, where large quantities of olive stones are collected as waste from olive oil production. The economic analysis shows how the use of ground olive stones as a partial replacement of fine aggregate in mortar can generate significant savings and economic returns in the medium term (10–20 years) by reducing conventional energy consumption in heating and air conditioning installations. Finally, the Environmental Life Cycle Analysis shows that the use of ground olive stones in GERO perforated bricks reduces environmental impacts in the medium term. In summary, the research concludes that the doping of mortar bricks with ground olive stones can have a positive impact on the economy, society and the environment, and represents a sustainable and cost-effective alternative for the construction industry. [ABSTRACT FROM AUTHOR]

Background: The development of cities and transport infrastructure produces a large volume of mineral waste (e.g. excavated earth material). At the same time, cities are increasingly trying to develop green infrastructures, given the ecosystem services they provide to people, but this comes with considerable economic and environmental costs associated with the transfer of fertile soil from rural areas to cities. In a circular economy approach, the reuse of mineral waste to build fertile soil is a substantial opportunity to reduce the economic and environmental costs of both mineral waste management and green infrastructure development. Soils constructed from these materials (constructed Technosols) must be able to support vegetation growth and become a suitable living environment for soil organisms. This requires ecological engineering to maximise the potential of constructed soils for biodiversity, both from a taxonomic and functional perspective. In this context, we systematically mapped the evidence related to the ability of soils constructed from mineral wastes to support biodiversity. Methods: We gathered published and grey literature through searches in two publications databases (Scopus and Web of Science Core Collection), one search engine (Google Scholar), nine organisational websites and through a call for literature. Titles, abstracts, and full-texts were successively screened using eligibility criteria. All included studies were described with coded variables and a database was produced. The extent of evidence was assessed and knowledge clusters and gaps were identified. Review findings: The searches yielded 9265 articles, and 153 articles were retained after the screening process. More than half of these articles were from European countries, with France leading the field with 40 articles, followed by Spain (15 articles) and Italy (10 articles). Most of the articles (75%) were produced after 2015. The main reasons for constructing soils from mineral waste were for mine rehabilitation (35%), waste recycling (16%) and experimental purpose (15%). The 153 articles were divided into 1962 studies, a study being a combination of a taxon, an intervention (i.e. soil construction) and a measured outcome. Among these studies, the most studied biological group is plants (69% of studies) and especially herbaceous species (32%), followed by microorganisms (17%) and invertebrates (14%). The most used type of mineral waste is mine waste (31% of studies) followed by excavated soil (16%) and demolition waste (14%). Finally, the most frequently measured outcome is plant growth (42% of studies), followed by organism abundance (16%) and diversity (10%). Conclusions: Three main knowledge clusters were identified which could be addressed in the future for full synthesis of the results: (1) How well do plants grow in soils constructed from mineral wastes? (2) What is the potential of soils constructed from mineral wastes to support biodiversity? and (3) How do microbial communities develop in soils constructed from mineral wastes? There is a lack of studies investigating several biological groups at the same time: only 6 articles out of 153 investigated the response of both plants, invertebrates and microorganisms to soil construction. More research is therefore needed on the ability to support a diversity of organisms. [ABSTRACT FROM AUTHOR]

• Raffia and mulching film hamper the direct reuse or plant residues in horticulture. • As a result, contaminated plant residues are often landfilled or incinerated. • We assess the use of biodegradable and compostable alternatives. • These alternatives are more expensive than conventional options. • They have a lower carbon footprint when conventional plastic waste is incinerated. Plastics and other materials commonly used in horticulture for plant support (e.g. raffia) and soil protection (e.g. mulching film) pose a challenge to achieving a circular economy. These materials contaminate plant residues, hampering their direct reuse due to the need for separation and cleaning. As a result, contaminated plant residues is often landfilled or incinerated. This study investigates the replacement of conventional plastic raffia and mulching film with biodegradable and compostable alternatives. Polypropylene raffia is compared with a biodegradable viscose polymer and compostable jute fibre, while polyethylene mulching film is compared with a biodegradable polylactic acid film. Conventional and novel alternatives are compared economically using Life-Cycle Costing and environmentally using Life-Cycle Assessment. The economic assessment is based on case studies with two horticultural companies in Almeria (south-eastern Spain), while the environmental analysis uses data from the Ecoinvent database. The use of biodegradable and compostable alternatives for raffia and mulching film proved to be 49% more expensive than conventional options. However, when conventional plastic waste is incinerated rather than landfilled, biodegradable and compostable alternatives have a lower carbon footprint. Although biodegradable and compostable options can be more expensive and have higher impacts in certain situations, proper waste management can lead to environmental benefits. With optimisation and incentives, these alternative options support the transition of horticulture to a sustainable circular economy. [ABSTRACT FROM AUTHOR]

Population growth and greater global interconnection require a profound transformation in how we produce, consume, and manage natural resources. In this sense, the circular transition of the agricultural and livestock sectors is vital to guarantee adequate production without compromising the availability of resources for future generations. In this work, we analyze the level of circular development of the primary sector in Spain using a sample of the 84 largest companies. We utilize the biplot analysis, multivariate graphic models that represent the joint distribution of four scores (constructed with sixteen ecological initiatives), and three financial and geographic variables. These techniques allow for visualization of the status and the relationships between all of them. We evidence an important degree of progress in initiatives associated with the use of non-polluting energy, eco-design, eco-innovation, management, and care of ecosystems. We also observe that the current transition towards a circular primary sector is strongly associated with firms' capital investments and long-term innovations. On the other hand, the actions aimed at protecting water resources are in an intermediate state of progress, being necessary to invest in additional friendly water initiatives. In this vein, it is advisable to promote public policies focused on promoting the ecological transition of this sector and the research that advances efficient water management. [ABSTRACT FROM AUTHOR]

Copyright of Revista Catalana de Dret Ambiental is the property of Universitat Rovira I Virgili and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Catalana de Dret Ambiental is the property of Universitat Rovira I Virgili and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista de Administración Pública is the property of Centro de Estudios Politicos y Constitucionales and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Mining and quarrying were important economic activities in Europe in past centuries, but during the 20th century, raw materials became vital to societal development. Mining has been subject to fluctuations related to wars, economic crises, and advances in environmental rights. A series of events led some European countries, such as Spain, to assume a leading position in the market for certain raw materials, such as tungsten. However, most of Europe's mines have been abandoned. This paper considers several postindustrial heritage sites that can used to illustrate how metal and stone were extracted in past centuries. Such sites have become a tourist attraction in the context of heritage in some countries. This area in western Spain, which contains ancestral quarries that helped build the architectural heritage of UNESCO World Heritage Cities and artisanal mines that contributed to building the economy of an extremely poor population, has a story to tell. All these mines and quarries can be used to explain the cultural heritage of the area as part of a postindustrial heritage landscape. [ABSTRACT FROM AUTHOR]

Background: The Next Generation EU (NGEU) is the primary financial instrument of the European Union’s post-COVID recovery policy. In particular, this major stimulus package is being used as an opportunity to accelerate the process of decarbonisation and reinforce climate policies. The article analyses Spain’s recovery plan and assess its potential contribution to the EU’s environmental and sustainability goals. Method: the study is drawn on a combination of academic literature, legal instruments and EU institutions and Spanish Government documents. The approach is mainly analytical. Results: NGEU funds provide Spain with the opportunity to undertake profound changes to construct a more resilient economic model. The green transition is the main axis of the Spanish recovery plan, with almost 40% of resources allocated to this process. Investments and reforms aimed at the ecological transition are currently being implemented in Spain at a rapid pace, in line with the EU’s goals and policies. Conclusions: The new challenges generated by the war in Ukraine will require Spain to deploy additional efforts not initially covered by the recovery plan. In particular, the deployment of renewable energy and improvement of circular economy policies will be crucial to accelerate the green transition. [ABSTRACT FROM AUTHOR]

Featured Application: Papermaking industry and technology. Innovative applications of vegetal residues. This study examines the potential of four invasive plant species, both arboreal and herbaceous, within the riparian forest of the Umia River in Galicia, a common ecosystem in northern Spain. These invasive species (Arundo donax, Phytolacca americana, Eucalyptus globulus, and Tradescantia fluminensis) were collected and assessed for their suitability as an alternative source of pulp and paper materials for the paper industry to mitigate the environmental impacts associated with conventional cellulose fiber production from harmful monocultures. Cellulosic material from leaves, bark, and/or stems of each of the selected species was isolated from lignin and hemicelluloses through kraft pulping processes. Resulted fibers and pulps were analyzed visually, morphologically, chemically, and mechanically to evaluate their papermaking properties. To compare these properties with those of commercially available pulp, test sheets were concurrently produced using commercial bleached Eucalyptus cellulose. The findings reveal that the employed fibers exhibit promising characteristics for artistic paper production. Regarding the pulp, two refining times were tested in a PFI machine, and the Schopper–Riegler degree was measured. Paper sheets underwent various tests to determine thickness, basis weight, apparent volume, apparent density, permeability, and chemical composition, as well as microscopic optical and morphological properties. The fibers obtained from the waste derived from the removal of invasive exotic species and biodiversity control present a viable and intriguing alternative for decentralized paper production, yielding noteworthy results for the creative sector. This research highlights the potential of harnessing invasive species for sustainable and innovative paper manufacturing practices. [ABSTRACT FROM AUTHOR]

In Spain and other Mediterranean countries, significant quantities of semi-solid olive mill waste are generated, which should be preferentially applied to agricultural soils to close nutrient cycles. However, two-phase olive mill waste (termed alperujo in Spanish) is known to pose risks to soil quality and plant production when applied to soil in large quantities. Alperujo has high contents of polyphenol substances, which can inhibit microbial growth and are also phytotoxic in nature. However, when applied in appropriate quantities and following specific methods, it is possible that the practice may not pose any risks, and this requires evaluation. As a waste management option, direct application of alperujo can supply plant nutrients and organic matter to degradation-prone Mediterranean soils. In order to validate this circular economy fertilization and soil protection strategy, an 18-month field experiment was undertaken, applying moderate quantities of alperujo on permanent crop groves throughout the Spanish region of Valencia. Eleven experimental parcels with permanent crops managed by farmers were identified to test two scenarios: a single application of 10 t/ha, and a second application of 10 t/ha after 10 months. Soil chemical parameters were assessed at 0, 6, 10, and 18 months. Soil organic carbon, total Kjeldahl nitrogen, pH, electrical conductivity, nitrates, and polyphenol contents were modified by alperujo application, but these effects were highly transient in nature, with generally no lasting effects after 4–6 months for either application scenario. Also, qualitative evaluations carried out by farmers revealed few effects, although some reductions in erosive processes and improvements in plant vigor were noted. As such, based on the measured parameters, it is concluded that the direct soil application of alperujo olive mill wastes at low application rates did not lead to any lasting detrimental effects on soil quality or compromise the productivity of permanent crops in this Mediterranean region. [ABSTRACT FROM AUTHOR]

Sustainable development has become an essential criterion for structural policies of the European Union, and these policies have extended its environmental dimensions. The EU has decided that circular economy will be framed within the principles of sustainable development. Thus, the changes brought forth will affect activities like agriculture, where environmental policy can undermine the stability of agricultural systems by reducing their profitability. The objective of this study was to evaluate how the implementation of these techniques impacted the southeastern peninsula of Spain, a farming region that supports the sovereignty and food security of the European Union in terms of fruit and vegetable products. The production techniques evaluated can increase production costs by up to 5.5%, although there are no significant differences in crop profitability. It is necessary to guarantee that all producers can access the incentive system to reduce their economic pressure, due in many cases to financial losses. In this regard, it is necessary to establish a specific green architecture for this subsector that factors in the effects of inflation to balance the triple aspect of sustainability. [ABSTRACT FROM AUTHOR]

Open pit mining causes damage in natural and rural regions; that is why soil restoration is necessary in order to recovery soil–plant systems. The application of waste can be a good solution for rehabilitation, and it clearly complies with the circular economy and the zero-waste strategy. This study was carried out in a quarry restoration area in the southeast of Spain, where experimental plots were designed and fertilized with different amendments (commonly used inorganic fertilizer N-K-P, pig slurry, pruning waste and urban solid wastes) with the objective of studying ways to improve the restoration of the soil by using these residues and increase the soil fertility before planting. The treatments applied were evaluated in the short term (two and four months from their addition to topsoil) and medium term (nine months) in order to determine if the restored soils will be adequate for agriculture based on nutrients' availability. The results showed that in all the treatments, the pH exceeded 8.5 due to the nature of the soil matrix, but after 9 months of the application, in the plots treated with NPK and pig slurry, the pH decreased. In general, with the application of the treatments, soil macro- (N, P, K, Na, Ca and Mg) and micro-nutrients (Fe and Cu) were increased. However, pig slurry and urban solid waste favored N and P, respectively. [ABSTRACT FROM AUTHOR]

Green Public Food Procurement (GPFP) has revealed itself to be an ally for achieving ecological transition objectives, however there is little work attempting to assess its contribution. This work proposes a set of sustainability and health indicators that comprise a tool able to evaluate the performance of GPFP. A Delphi analysis and a participatory process is used to determine Key Performance Indicators that have been tested through two case studies in Spain. The results obtained show that the presence of short marketing circuits and food sovereignty and institutions rooted in the territory contribute to improved economic sustainability and good performance in terms of health. However, for environmental issues the performance is somewhat lacking, as instruments such as renewable energies and the circular economy are not implemented on a local scale. Elements linked to territorial cohesion and social capital are key for the principles of social and labor justice, as well as governance, to prevail. The Mediterranean diet integral to the case studies presented results in adequate health indicators. These types of indicators would be a useful tool for introducing sustainable food certification as a driving force for changing the food model. [ABSTRACT FROM AUTHOR]

The income and residue production from agriculture has a strong impact in Spain. A circular economy and a bioeconomy are two alternative sustainable models that include the revalorization of agri-food by-products to recover healthy biomolecules. However, most crops are conventional, implying the use of pesticides. Hence, the reutilization of agri-food by-products may involve the accumulation of pesticides. Even though the waste-to-bioproducts trend has been widely studied, the potential accumulation of pesticides during by-product revalorization has been scarcely assessed. Therefore, in this study, the most common pesticides found in eight highly productive crops in Spain are evaluated according to the available published data, mainly from EFSA reports. Among these, oranges, berries and peppers showed an increasing tendency regarding pesticide exceedances. In addition, the adverse effects of pesticides on human and animal health and the environment were considered. Finally, a safety assessment was developed to understand if the reutilization of citrus peels to recover ascorbic acid (AA) would represent a risk to human health. The results obtained seem to indicate the safety of this by-product to recover AA concentrations to avoid scurvy (45 mg/day) and improve health (200 mg/day). Therefore, this work evaluates the potential risk of pesticide exposure through the revalorization of agri-food by-products using peels from citruses, one of the major agricultural crops in Spain, as a case study. [ABSTRACT FROM AUTHOR]

We live in a planet with finite resources and a limited availability of absorbing residues. Thus, Spain -as well as the rest of the countries-faces the inevitable challenge of moving towards a more circular and sustainable economy. The 2030 Sustainable Development Agenda and the European Green Deal set this course. This is also the aim of the strategy 2030 Circular Spain. But, given the colossal dimension of this ecological transition, it is essential that the Spanish central Government seeks new -and unexplored- allies, such as the "social currencies", which are alternative economic experiences that try to stimulate the local economy and that can also effectively help to reduce the environmental footprint of their users. In this research we confirm that there are potential synergies between social currencies and the circular economy, but social currencies are not taken into account in the strategy 2030 Circular Spain. This situation is due to the lack of awareness about social currencies among the different public administrations, as well as the lack of social demand in favour of social currencies, the high heterogeneity of these currencies, the lack of coordination among them, and the lack of confidence of public administrations in alternative economical experiences. [ABSTRACT FROM AUTHOR]

Copyright of Mediterranean Journal of Communication / Revista Mediterránea de Comunicación is the property of Revista Mediterranea de Comunicacion / Mediterranean Journal of Communication and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Catalana de Dret Ambiental is the property of Universitat Rovira I Virgili and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The agrifood sector is a sector that, in the context of the global economy, has been registering an intrinsic potential to build, rather than deplete, natural capital. It supports daily and longterm well-being, contributing to economic and social development and, therefore, natural systems. The olive oil subsector has assumed a gradual economic importance in recent years due to the growth in production. However, this phenomenon has not changed Portuguese consumption habits too much, unlike Spain, as we will see. The olive oil line is a strategic route in both countries' agricultural policy and economy. In Portugal and Spain this sector has registered a high level of investment and production, despite the expectation of a certain price stability. The Circular Economy is a recent concept, but it has long been present in the agrifood sector. The creation of "return circuits" in agriculture is inspired by the mechanisms of natural ecosystems and is an integral part of these same cycles. From the statistical analysis used, we conclude that there are several ways that the olive sector contributes to the circularity of the economy. [ABSTRACT FROM AUTHOR]

Sustainable and circular production models, such as the circular economy and circular bioeconomy, have become key mechanisms to leave behind the traditional linear model of food production. Under this approach and considering the waste biomass potential available in Spain and the Czech Republic, the main objective of this study is to analyse the most relevant aspects of the generation, use and regulation of agricultural waste biomass (AWB) in both countries. For this purpose, a scientometric analysis and systematic review of published research in the Scopus database were carried out. A complementary analysis of AWB management policies and regulations was also part of the methodology. The results show that Spain has published almost twice as much research as the Czech Republic. Furthermore, 91% of the retrieved research prioritizes the characterization and estimation of the potential of more than 15 AWB types. Among the main ones are olive residues, horticultural residues and wheat straw, which are used for producing organic amendments, bioenergy and biofuels. The results confirm that the reduction and valorization of AWB is an issue that has become more important in the last 13 years, mainly due to the policies and strategies for circular economy and circular bioeconomy. With this in mind, this study provides relevant information for governments on the aspects that need to be improved to advance in the valorization of AWB. This study also provides guidance to farmers on the reduction and/or recovery alternatives that they can implement to move towards sustainable and circular agriculture. [ABSTRACT FROM AUTHOR]

The most recent years of research have shifted the perception of desalination brine from being waste to a high-value resource, in consonance with a circular economy perspective. The Canary Islands, containing the largest number of desalination plants per square kilometre in the world, are a perfect location to study its characteristics and evaluate its potential. A total of 10 heterogeneous seawater reverse osmosis plants were selected to determine the brine's physicochemical characterisation, comprising 37 parameters, and its correlation to the technical and operational aspects of the desalination plants. The results show a stable narrow range of the percentage of major ions concentration in relation to the total dissolved solids (55% Cl−, 29.5% Na+, 8% SO42−, 4% Mg2+, 1.5% Ca2+, 1.2% K+, 0.5% HCO3−, and 0.2% Br−) irrespective of specific differences between plants. The results obtained in this study are highly beneficial to industrial suppliers and future users of desalination brine valorisation (DBV) technologies, allowing an estimation of the chemical composition of a brine through knowledge only of its conductivity. Such information is crucial before investing in and optimizing DBV technologies. Nonetheless, from an environmental, economic, operational, energy-based, and R&D point of view, several improvements are required to promote their large-scale feasibility and viability. [ABSTRACT FROM AUTHOR]

Purpose: The circular economy is a key issue for any company, city, or institution. The linear economy model, based on "take, make, use and waste" of products and resources, has discarded potentially valuable resources and caused serious contamination problems. In contrast, the circular economy (CE) model is a strategic paradigm whose purpose is to regenerate and conserve resources through closed material loops and the sustainable use of energy in its processes. Therefore, a growing number of companies are applying different tools and techniques to implement the CE principles to innovate their products, services, and processes, achieving promising results. Thus, the main objective of this study is to suggest an implementation model named "Circular clock" based on a set of tools and techniques which firms may use for implementing CE. Design/methodology/approach: The paper presents an empirical analysis based on the triangulation method that includes three different data sources: semi-structured interviews in Spain, academic literature and books, and non-academic publications from institutions and consultancy firms. Findings: The most relevant result of this study is the proposal of a Circular Clock model for circular economy implementation is based on six fields of action define in the academic literature: take, make, distribute, use, recover, and industrial symbiosis. Moreover, this study may serve as guidance in facilitating the strategic adoption of eco-innovation practices in firms' transition to a CE. Research limitations/implications: The sample of companies that participated in the triangulation is exploratory; however, this limitation is overcome by reviewing academic literature and institutional reports. On the other hand, academics could expand the selection of tools with subsequent studies. Practical implications: The current study is based on the triangulation method, which was vital to balance the theory and practice provided by academic sources, reports, and books. In addition, this study has improved our understanding of the goals or intentions that may motivate firms to implement the CE and align them with the suggested set of tools. Consequently, this study is relevant to support practitioners in selecting a tool based on the goal they want to achieve towards circular economy implementation. Social implications: This research suggests several tools; however, each organization could adapt some that it already knows. Therefore, firms and implementation leaders should customize the circle with short lines in each case. Moreover, the clock bells represent the deadline considering that every CE implementation process requires a deadline to ensure its success in micro-level or firms. Originality/value: The "circular clock" provides a didactic way for sustainability leaders, consultants, or companies to facilitate the implementation of the circular economy by choosing the field of action on which they want to focus and the most appropriate tool according to their strategy, objective, and budget. Therefore, this model is based on the balance between theory and practice. [ABSTRACT FROM AUTHOR]

Value-Added Compounds (VACs) are molecules that have attracted great attention in the literature regarding their potential for integration into existing processes or products. In Winery Wastewater (WW), VACs are valuable because of their antioxidant characteristics. Furthermore, integrated systems for recovery of these molecules and treatment of WW can be a powerful strategy towards an environmentally efficient way of wine production. Therefore, a bibliometric analysis was conducted to establish the status and trace research trends on that topic. The analysis investigated the Web of Science database from 1953–2023, where the software VOSviewer® and R were used. Secondly, an extensive literature review was carried out on VACs recovery from WW by membrane process, which was identified as a promising strategy. As a result, the historical evolution of publications has a growing behavior while citations take time to grow. The most productive authors, journals, and countries were analyzed, with Spain being the leading country in publications on that topic. Lastly, keyword mapping revealed the relevance of "circular economy" and "biorefinery" as knowledge transfer concepts where both traditional and emergent technologies are connected towards the achievement of sustainable development goals. The recovery of phenolic compounds from wine production through membrane processes stands out as a promising technology. Different recovery approaches using membrane processing were assessed in the review. Studies could achieve up to 100% phenolic compound and polysaccharide rejections and also addressed the possibility of fractioning these compounds. [ABSTRACT FROM AUTHOR]

Hospitals generate huge amounts of nonwoven residues daily. This paper focused on studying the evolution of nonwoven waste generated in the Francesc de Borja Hospital, Spain, over the last few years and its relation to the COVID-19 pandemic. The main objective was to identify the most impacting pieces of nonwoven equipment in the hospital and to analyze possible solutions. The carbon footprint of the nonwoven equipment was studied through a life-cycle assessment. The results showed an apparent increase in the carbon footprint in the hospital from 2020. Additionally, due to the higher annual volume, the simple nonwoven gown used primarily for patients had a higher carbon footprint over a year than the more sophisticated surgical gowns. It can be concluded that developing a local circular economy strategy for medical equipment could be the solution to avoid the enormous waste generation and the carbon footprint of nonwoven production. [ABSTRACT FROM AUTHOR]

The construction and demolition sectors are among the world's most critical activities, generating large amounts of waste. Thus, these sectors' waste accumulation problem is related to the environmental protection system and proper waste management. On the other hand, it is well known that proper waste disposal can increase its value. In this way, the economic potential of the trash can be raised again. Therefore, this article will examine the economic potential of construction and demolition (C & D) waste. Different waste management processes will be analyzed to better understand the topic from a financial perspective in this area underway in Spain. Therefore, data from other regions of Spain were collected. This data led to results where the most expensive rooms were Pais Vasco and the Balearic Islands, where disposal of C & D waste had the highest prices, exceeding EUR 30 per ton. Conversely, the lowest prices are found in regions such as Navarre and Andalusia, where prices per ton are EUR 8 and EUR 6, respectively. The values show a direct relationship between the treatment price and the amount of C & D waste disposed of. Therefore, this article will look at different factors influencing sustainable waste management. Such activities have a positive impact, as waste needs to be recycled and reevaluated by waste management operators. The cost of construction waste is an integral part of the budget because it represents the monetary value of the cost of collecting and recycling construction waste. Construction waste is an essential resource for economic and social development, as it contributes to job creation, education and culture, and the protection and preservation of the environment. [ABSTRACT FROM AUTHOR]

Knowledge-based and innovative bioeconomy is a cornerstone for achieving the goals of the European Green Deal. Due to its comprehensive coverage, bioeconomy performance is challenging to assess unambiguously. This paper presents the results of a cross-country comparison of 22 EU countries applying the Complex Bioeconomy Sustainability Index for 2012–2018. Results were compared with results of the TOPSIS multi-criteria decision-making method on national bioeconomy strategies in Finland, France, Spain, Italy, Ireland, and Latvia. The research aims to combine a quantitative assessment of bioeconomy output indicators with a qualitative evaluation of bioeconomy strategies of EU Member States. [ABSTRACT FROM AUTHOR]

The new Law 7/2022, on Waste and Contaminated Soils, introduces important changes in terms of textile waste, a sector that has traditionally received less attention in terms of the volume and management of waste produced. The textile industry is, in fact, the fourth most polluting in terms of waste volume and, in addition, it has been increased by the social practice of fast fashion employment. Due to the aforementioned, the European Directive ((EU) 2018/851) which modifies Directive 2008/98/EC on waste is of particular importance. This new Directive obliges the Member States to the selective collection of textile waste before January 1st, 2025, and to establish objectives related to the preparation for reuse and recycling of this waste. This will have an impact on the entire textile value chain as it will be necessary for companies to start designing and preparing their products to contain recycled material and to allow its recycling. The new tendencies in the management of textile disposables promote an increase in public awareness about consumption practices as well as the co-responsibility of producers and users. The management of textile waste, whose main destination is the social economy, will have to promote technologies for the recovery of surpluses to reintroduce these materials into the consumption process, thus favoring the circular economy and sustainability. [ABSTRACT FROM AUTHOR]

• The lack of praxis of circular material flow cost accounting makes its application difficult in small companies. • Tools such as material flow cost accounting contribute to the introduction of circular processes in companies. • Managers can allocate the materials-related costs to different cost centres defined as "circular" costs. • Circular economy requires specific dynamic capabilities for environmental accounting practices. • Accountants could play pivotal roles in influencing circular economy adoption, especially in small companies. Tools as material flows cost accounting contribute to the introduction of the circular economy in companies, but praxis of these tools adapted to circular environments are scarce and the lack of accounting references makes its application difficult, particularly in SMEs. In addition, the circular economy requires of specific dynamic capabilities for environmental accounting practices to reflect the different alternatives for closing materials, stocks, and resources loops. To address the dimensioning of circular flows and their relative costs, this study offers a simplified application at a small scale of material flows cost accounting methodology based on the results of an agri-food case study in Spain using a dual approach, Ultimately, the accounting implications derived from the introduction of circular models are defined in this study to analyze firms' specific circular accounting capabilities applied by small companies to less complex processes than those usually studied in the previous literature. [Display omitted] [ABSTRACT FROM AUTHOR]

The article highlights the call for the Conama Sustainability Award for Small and Medium-Sized Municipalities, organized by the Conama Foundation. The award seeks to recognize projects related to the environment, demographic challenge, or sustainable development, addressing various themes such as conservation of natural heritage, adaptation to climate change, and circular economy. Local entities in Spain are invited to submit their projects, dividing the award into categories based on the size of the participating municipalities. [Extracted from the article]

The use of by-products from agricultural and forestry activity, apart from many other environmental benefits, constitutes an alternative source of income, cost reduction, and support for the principles of the circular economy. The bobal grape is a variety of red grape that is cultivated on 65 thousand hectares only in Spain. Periodic maintenance of the crop must be carried out through winter pruning from December to March. The pruning biomass is burned or crushed and incorporated into the soil, producing environmental contamination and disease transmission. The objective of this work was to use the biomass from vineyard residues in the production of binderless particleboards without using any adhesives, thereby obtaining an ecological product that would benefit the environment. In the manufacturing process, the press temperature (130 °C) and pressure (2.6 MPa) were fixed, varying the particle size (<0.25, 0.25 to 1.00, and 1.00 to 2.00), and the pressing time (15, 30, and 45 min). The results showed that by using particles smaller than 0.25 mm and applying 45 min in the hot press, panels were manufactured that are suitable for general use in a dry environment and for the manufacture of furniture according to European standards. [ABSTRACT FROM AUTHOR]

The effects of olive waste biochar and green compost as soil amendments on soil physical properties, as well as on physiological parameters and yield of a super-intensive olive crop cultivated under deficit irrigation conditions, were investigated in south-west Spain during the 2021 growing season. Thus, soils were amended with 40 t ha−1 of olive pomace waste biochar, green-compost, or a biochar-compost mixture (50% w/w), and no amended plots were used as control. On a bi-monthly basis, soil pH, water holding capacity, humidity, and resistance to penetrability were determined. In addition, various indicators of the physiological status and water stress of the plant were also monitored. Finally, the olive yield per tree was measured. Results showed that biochar application was the most effective amendment for increasing soil moisture and reducing soil compaction. The latter was evidenced by the significant reduction of the resistance to the penetrability of the amended soils. Plants of the amended plots showed better leaf water potential. In addition, values of the net photosynthesis rate, the average intrinsic water-use efficiency, and the maximum rate of electron transport in the time before the harvest improved significantly in the trees from the biochar-amended plots, for which olive fruit yields increased by about 15% in comparison with the other treatments. Nevertheless, the estimated net oil yield per tree was similar because the olives from the biochar-amended trees contained more moisture. This field trial shows for the first time that by providing the soil with biochar from olive crop waste as an organic amendment, having high water retention capacity, porosity, and stability, it would be possible to reduce the irrigation water needed and maintain plant yields. [ABSTRACT FROM AUTHOR]

"Circular economy" and "eco-design" are concepts that people not only understand but also demand. The scarcity of resources and their fluctuating cost forces us to transform linear production systems into circular ones, which implies the entire life cycle of the product. This study arises from this fact, to analyze the impact of eco-design on the circular economy. We developed a bibliometric analysis in the research community of Spain, analyzing the frequencies, typology, and evolution of knowledge. We define a conceptual framework of the two concepts, to reaffirm our results after applying the analysis in a very deep way. We carefully reviewed 86 articles that adhered to the defined variables. Both quantitative and cooccurrence analyses have been performed. This makes it possible to differentiate three clear fields of knowledge - the cradle-to-grave approach, energy efficiency and emission reduction, and the circular economy and eco-design group. The results are quite clear in the Spanish sphere, and it can be stated that there has been instability until 2016, that is, until the action of the European Commission. There are collaboration networks with other countries. The co-occurrence analysis indicates that, until 2016, these terms have given way to those of "circular economy" and "climate change," without neglecting "eco-design," as a tool for action, that, although it was published before, it is shown that they are complementary. [ABSTRACT FROM AUTHOR]

Background: Waste disposal is an activity that pollutes the environment. The European Union has developed different legislative measures which are based on the circular economy (CE) to avoid this negative externality. The management of agricultural packaging (fertilizers and phytosanitary products) is carried out through Collective Deposit, Return, and Refund Systems (CDRRS). New regulations on waste tax the consumption of non-recyclable plastic in packaging, but also reward the use of plastic by-products from packaging. The administrations recommend using biodegradable plastic in the means of production, as well as establishing a traceability system (TS) to control the proper management of all the generated waste. The proposed measures can affect producer cost accounts. This work aimed to identify and evaluate the existing agricultural packaging management system in Spain. It also studied the influence of the price of a barrel of oil, crop surface, irrigation regime, and the type of subsectors on CDRRS, and quantified the impact of the latest fiscal measures and initiatives proposed by Spanish administrations. Results: The generation of agricultural packaging is influenced by variables including the cultivated area, irrigation regime, and agricultural subsector. The price of a barrel of oil directly influences the current by-product utilization system. Using biodegradable plastic or implementing a TS can increase production costs by up to 9.80%. The current system of subsidies to producers can soften the economic impact caused by the additional cost of biodegradable plastic (4.03%), but no subsidies have been foreseen to encourage the use of environmentally friendly alternatives. Conclusions: Findings indicate that public administrations should be guided by the specific characteristics of the different agricultural systems when defining regulations on agricultural waste management. The fixed rate in the current system of subsidies for using plastic by-products obtained from packaging should be substituted for a variable rate. Transferring powers to autonomous communities to define by-products may lead to heterogeneity in the Spanish territory. New measures derived from the recent environmental agreements to comply with the 2030 Agenda will increase production costs even after considering the current aid scheme. The subsidy coefficient should be increased to 80% of the purchase invoice. [ABSTRACT FROM AUTHOR]

Currently, the absence of specific regulations on soil fertilization gives rise to sectorial normative with different regional approaches regarding application conditions, quality and other conditions that reused materials must meet. The purpose of this case study in Galicia (NW Spain) is to analyse the coherence of legal texts in the application of organic waste in soils regarding a more circular economy. The context of the case study is characterized by several Directives such as the Nitrates Directive or the "out of date" Directive on sewage sludge, among others, the lack of soil quality protection regulations and the existence of different administrative levels (European Union, Member State and Region). Manures and other agriculture wastes represent the main source of wastes being vastly applied to soils without previous treatment. Other waste streams (i.e. industrial biowaste, municipal biowaste and sewage sludge) undergo treatment generating commercial fertilizers, biostabilized wastes, technosols and waste-treated products that are subject to different standards. The screening of regulations and scientific literature detected limiting situations in the recycling of organic wastes due to natural or legal issues. On the other hand, risky applications are identified due to the lack of quality requirements for waste-treated products under regional legislation, or no mandatory compliance with codes of good agricultural practices for manures and waste-treated products. Contradictory situations of legal regulations and other issues were outlined and discussed. Final considerations were outlined to promote a more effective recycling of organic wastes and the design of a suitable legislation adapted to the natural conditions of the region. [ABSTRACT FROM AUTHOR]

In recent years, the concept of the circular economy has been gaining relevance and its importance has grown both in academia and in rural municipalities in general. The rural development policy of the European Union, in addition to prioritizing the diversification of the productive activities of municipalities, encourages the adoption of the circular economy. The aim of this article is to show and publicize the applications relating to the circular economy that are being carried out in a rural mountain municipality with a small population focused on agriculture, and which are setting an example for others that are suffering the endemic problem of depopulation. A diagnosis is carried out taking into consideration local sustainable development methodologies. In relation to the results, the positive impact of these practices with a rural development approach based on awareness and education regarding the basic 3Rs (reduce, reuse, recycle) is highlighted. Almócita is an example that can be extrapolated to many mountain municipalities at national and international levels. [ABSTRACT FROM AUTHOR]

Copyright of Revista Catalana de Dret Ambiental is the property of Universitat Rovira I Virgili and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This paper presents the results of an extensive experimental campaign related to the use of Coal Mining Waste Geomaterials (CMWGs) as recycled constituents (fine and coarse aggregates) in Ordinary Portland Cement mortars and concretes. To this purpose, a reference mix and other mixes with different percentages of replacement of natural aggregates by CMWGs, up to 40% by volume, were investigated. CMWGs came from different providers: Central Mining Institute (GIG), POLTEGOR, both in Poland, and SUBTERRA in Spain and tests were performed at two different laboratories working on similar, but not identical, compositions. This represents a novelty in the literature, generally focusing on one single-source waste and single-lab results. The physical and mechanical properties of all the mixes were evaluated and correlated with respect to the percentage of replacement of natural aggregates by CMWGs. While the presence of CMWGs, likely because of their grain size distribution, reduced the porosity of mortars (decrease of 9.5 and 20.4% for 10 and 20% of replacement respectively) and concretes (70% reduction for concretes with 10% of fines and 30% of coarse aggregates replaced by CMWGs), the mechanical properties decreased when natural aggregates were replaced with CMWGs, likely because of the reduced strength of the CMWGs aggregates. This decrease was found to be roughly proportional to the percentage of replacement of aggregates (for instance, a 12–23% reduction of flexural strength in mortars with 25% replacement of sand and, a decrease of 25% in concretes for a 25% replacement of fine and coarse aggregates); nonetheless the concrete performance remained in the range of applicability for several civil engineering applications without affecting their functionality. In conclusion, the replacement of natural aggregates by CMWGs has resulted an interesting option for real applications providing an added value to the implementation of circular economy concepts in the management and up-cycling of coal mine tailings and CMWGs. • Recycling Coal Mine Waste Geomaterials as partial replacement of fine and coarse aggregates in concrete is feasible.. • Complementarity and coherence of results from two different labs with aggregates from three sources validate the methodology. • Thin section analysis provides insight into microstructural reasons of macroscopic properties highlighting the interaction of CMWGs with cement paste. • Reduction in compressive strength induced by weaker CMWG aggregates does not jeopardize the possibility of producing concrete still retaining values of compressive strength fit for several structural applications. [ABSTRACT FROM AUTHOR]

"Metals for energy & digital transition in Spain: demand, recycling and sufficiency alternatives" - Martín Lallana, Jorge Torrubia, Alicia Valero. • Material flow analysis at country-level with a tailored approach to public policies. • Electric mobility accounts for 54–92 % cumulative metal demand between 2020 and 2050. • Ambitious recycling and collection rates could meet 23–68 % of cumulative metal demand. • The 'equitable fraction of global reserves' for lithium and cobalt would be surpassed. • Sufficiency alternatives could reduce by 11–61 % the primary extraction requirements. This study employs Material Flow Analysis (MFA) to comprehensively forecast metal demand in alignment with energy and digital transition policies at the country level, focusing on Spain. Our analysis spans eight technologies and ten metal groups, projecting metal demand and end-of-life recycling by 2050. We apply ambitious collection and recycling rate objectives, providing estimates of primary extraction requirements. We define and evaluate six scenarios targeting circular economy and sufficiency alternatives aimed at reducing primary extraction. Our results highlight electric mobility as the predominant driver of future metal demand, accounting for 54–92 % of cumulative demand for aluminum, copper, manganese, cobalt, nickel, lithium, dysprosium, and neodymium. From a global justice perspective, the 'equitable fraction of global reserves' for lithium and cobalt is surpassed. Ambitious recycling efforts could potentially cover 23–68 % of the cumulative metal demand between 2020 and 2050, while implementing circular economy and sufficiency alternatives might reduce primary extraction requirements by 11–61 %. [ABSTRACT FROM AUTHOR]

[Display omitted] • A methodology was proposed to evaluate circularity alternatives for CDW products. • Key CE alternatives for concrete waste were identified. • CE and linear economy alternatives were compared using multicriteria analysis. • An environmental (LCA) and economic assessment of alternatives was performed. • CE options showed environmental and economic advantages over conventional options. Construction and demolition waste (CDW) is identified by multiple circular economy (CE) policies as a key sector for implementing circularity strategies due to the high volume of waste produced and the large consumption of raw materials. However, CE is not widely applied in the sector because of the lack of solid estimations on its environmental and economic viability. The main aim of this study was to propose a set of methodological steps to identify the optimal circularity alternatives for CDW products based on a multicriteria analysis of their environmental and economic performance. This methodology is applied to evaluate concrete waste. In specific, high-grade applications of concrete waste were analyzed comprising the processing into recycled coarse aggregates (RCA) for their use in structural and non-structural concrete. Multiple scenarios with different RCA replacements (20%, 30% and 100%) and different types of sorting and recycling (on-site and off-site) were evaluated in accordance with the specific site conditions of the region of Catalonia, Spain. The Life Cycle Analysis methodology (LCA) was used to perform the environmental analysis, while a detailed cost analysis was conducted for the economic aspect. The multicriteria method VIKOR was used for the selection of alternatives considering three different criteria. The results of this study showed environmental and economic advantages of CE scenarios based on the use of RCA over conventional concrete, mainly due to the influence of landfilling and transport distances. RCA produced on-site showed a better performance than RCA from fixed plants. [ABSTRACT FROM AUTHOR]

The article provides a summary of the new waste law in Spain, Law 7/2022, on Waste and Contaminated Soils for a Circular Economy. The law aims to establish the principles of the circular economy and review aspects of the previous law to ensure its progress. It focuses on waste management, prevention, production, and extended producer responsibility. It also addresses topics such as plastics, contaminated soils, and fiscal measures to incentivize the circular economy. The law incorporates European directives and defines various concepts related to waste and plastics. [Extracted from the article]

Copyright of Boletín Económico de ICE is the property of S.G.E.E.I.P.C., Secretaria de Estado de Comercio, Ministerio de Industria, Comercio y Turismo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Although several studies have approached the environmental or economic impacts derived from the adoption of the circular economy's principles by businesses, the social dimension of the circular model at the micro‐level is underexplored in the literature. To fill this gap, this study defines and analyses different categories of social impacts related to a circular business model to assess and report the holistic dimension of the circular economy at the micro‐level. This paper is eminently reflective, and the methodology is mainly based on a desk research method. In addition, the results of 137 brief surveys collected in Spain are summarised to reflect the social metrics of a circular business model proposed in the literature. This study contributes to the existing knowledge on circular economy from a sustainability accounting perspective and invites scholars towards new research topics from the triple bottom line approach of the circular business model. [ABSTRACT FROM AUTHOR]

The European Union, as delineated in Regulation (EU) 2020/741, sets forth minimum criteria for the reuse of wastewater. Directive 86/278/CEE sets the regulations for the reuse of sewage sludge in agriculture. This study aimed to investigate the treated water derived from a pilot plant situated in Granada, Spain, that utilizes membrane bioreactor technology to process real urban wastewater with the quality standards necessary for agricultural reuse. Additionally, the study evaluated the utilization potential of other resources generated during wastewater treatment, including biogas and biostabilized sludge. The pilot plant incorporated a membrane bioreactor featuring four ultrafiltration membranes operating continuously alongside a sludge treatment line operating in batch mode. The pilot plant operated during four cycles, each with distinct hydraulic retention times (6 h and 12 h) and variable mixed liquor-suspended solids concentrations (ranging from 2688 mg L -1 to 7542 mg L -1 ). During these cycles, the plant was doped with increasing concentrations of emerging contamination compounds (diclofenac, ibuprofen, and erythromycin) to test their effect on the resources derived from the treatment. Subsequently, a tertiary treatment involving an advanced oxidation process was applied to the different water lines, which left the wastewater treatment plant for a period of 30 min and utilized varying concentrations of oxidant. The results indicate that the effluent obtained meets the required quality standards for agricultural use. Therefore, there is potential to use this waste as a resource, which is in line with the principles of the circular economy. Furthermore, the other resources generated during the treatment process, such as the biogas produced during the digestion process and the biostabilized sludge, have the potential to be used as resources according to the circular economy indicators., Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Laura Antiñolo Bermúdez reports financial support by the Ministerio de Ciencia, Innovación y Universidades, Gobierno de España Project PID2021-124740NB-I00 financed by MCIN/AEI/10.13039/501100011033/ and by ERDF, EU., (Copyright © 2024 The Authors. Published by Elsevier B.V. All rights reserved.)

The Water-Energy-Food (WEF) nexus approach is increasingly being used for supporting a transition to sustainable development, with initiatives involving the concept of circular economy (CE). In the agricultural sector in particular, assessing this nexus is crucial to ensure food security, control the consumption of key resources such as water and energy, as well as measure atmospheric emissions linked to climate change. This manuscript aims to propose a novel approach by coupling the WEF nexus with a circularity indicator, seeking to capture in a single index (the WEF+CEi) both performances in a sample of companies. The novel approach is applied to 30 dairy farms located in Galicia (NW Spain) to benchmark them in a holistic manner. To do this, the WEF nexus of each farm was represented through the following indicators: carbon footprint, water footprint, energy footprint, and food productivity. In addition, the percentage of circularity for each farm, and for the agro-industrial cooperative was measured thanks to the application of a circularity tool in percentage terms. Finally, the WEF+CEi indicator was obtained using the multicriteria mathematical tool of Data Envelopment Analysis (DEA). The results show that without considering the agro-industrial cooperative, the system is 51 % circular. On the other hand, considering the farms and the cooperative, the system goes up to 80 % of circularity. Finally, the proposed approach can support decision-making and provide insights for producers and stakeholders in the area., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)

• Circular economy strategies can be fostered with the use of waste taxation. • We assess the economic and environmental effects of landfill and incineration taxes. • An energy-environment-economy dynamic CGE model for Spain is developed. • The model provides high detail, with 19 different waste treatment industries. • We find a low economic impact and a reduction of all the environmental impacts. Economic theory states that incineration and landfill taxation can effectively diminish the environmental impacts of pollution and resource use by reducing their associated pollutants while stimulating the reuse and recycling of materials, and therefore, fostering a circular economy. The aim of this research is to assess the economic and environmental effects of these taxes in Spain in different scenarios with a detailed dynamic computable general equilibrium (CGE) model, as there are no studies analyzing this in detail. We focus on the economic impact on GDP and sectorial production and the environmental impact on different categories: global warming potential, marine eutrophication potential, photochemical ozone formation potential, particulate matter, human toxicity (cancer and noncancer), ecotoxicity, and depletion of fossil resources. We find in all scenarios that these taxes have a limited economic impact while reducing all of the environmental impact categories analyzed. The study reinforces the theory that policy makers need to impose taxes on landfill and incineration to reinforce the circularity of the economy and reduce environmental burdens, but also demonstrates that they can improve their design without additional costs. [ABSTRACT FROM AUTHOR]