9 results on '"Devendra, Saroj"'
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2. Life cycle assessment of nutrient recovery strategies from domestic wastewaters to quantify environmental performance and identification of trade-offs
- Author
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Carla Mae Pausta, Pradip Kalbar, and Devendra Saroj
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Life cycle assessment ,Nutrient recovery ,Wastewater ,Septage ,Water quality ,Medicine ,Science - Abstract
Abstract Increase in anthropogenic activities proliferated the consumption of resources such as phosphorus; and increase the adverse environmental impacts especially eutrophication on water resources such as lakes. Nutrient recovery from domestic wastewaters to produce a fertiliser has been explored to address these challenges in the context of a sustainable circular nutrient economy. Life cycle assessment (LCA) was performed to holistically assess the impacts of integrating a nutrient recovery system on wastewater and water resource management using Laguna de Bay, Philippines as the geographical boundary. The inventory was developed based on the results of the emerging nutrient recovery reactor operations and the application of the recovered fertiliser on the agricultural crops. The LCA results for the proposed scenario showed environmental benefits of about 83.6% freshwater eutrophication, 102.5% terrestrial ecotoxicity, 26.9% water consumption, 100.7% mineral resource scarcity, while the global warming potential is 95.4% higher than the baseline scenario. Results imply policy review for septage management, system optimisation, and evaluation of alternative methods of wastewater management, in terms of life cycle thinking and sustainability across the globe.
- Published
- 2024
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3. Modelling and optimization studies on decolorization of brilliant green dye using integrated nanofiltration and photocatalysis
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Naresh Yadav Donkadokula, Anand Kishore Kola, and Devendra Saroj
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Dye degradation ,Photocatalysis ,Ceramic nanofiltration ,Hybrid system ,RSM ,Environmental technology. Sanitary engineering ,TD1-1066 - Abstract
Abstract The current work explores the treatment of dye wastewater using the combination of photocatalysis and ceramic nanofiltration process. Commercial ceramic membrane and titanium dioxide (TiO2) photocatalyst were used in this study to investigate the removal of Brilliant Green (BG) dye from the synthetic dye wastewater solution. The effect of various operating parameters on dye decolorization and total organic carbon removal were investigated. The operating parameters (pH, catalyst loading and time duration) were optimized using an experimental design model namely Response Surface Methodology (RSM). The use of experimental design by RSM resulted in the improvement of dye decolorization at optimum conditions. In addition to these operating parameters, the trend of initial dye concentration and the influence of catalyst loading on permeate flux was also studied. Around 99% of decolorization was obtained by the hybrid system at 500 mg L− 1 of dye concentration, 1 g L− 1 of TiO2 dosage, pH of 4.2 and 90 min. The integrated system i.e. photocatalytic reactor with nanofiltration membrane has shown complete removal of BG dye compared to individual systems. From the present study, it can be concluded that this integrated system is one of the efficient methods for dye treatment.
- Published
- 2020
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- View/download PDF
4. Whose resilience matters? A socio-ecological systems approach to defining and assessing disaster resilience for small islands
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Joan Pauline Talubo, Stephen Morse, and Devendra Saroj
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Resilience ,Disaster Resilience ,Small Islands ,Vulnerability ,Socio-ecological Systems ,Island Resilience ,Environmental sciences ,GE1-350 - Abstract
Resilience is a multi-faceted concept that traces its evolution based on the field of discipline wherein it was used. Various researchers have defined the term throughout the years according to their own expertise. This has impacted the development and evolution of the concept and how it was used in each specific discipline. One of the most recent and important use of the term is in the disaster paradigm. This paper traces the evolution of the definition of resilience and narrows it down to the disaster realm, eventually focusing on small islands as a socio-ecological system. It also discusses the relationship of resilience with vulnerability and enumerates the various tools and methods that have been used to measure both concepts. This review also presents an integration which identifies social, economic and ecological resilience as the different facets of disaster resilience of small islands. This paper reveals that there are gaps in defining disaster resilience of small islands through a socio-ecological systems approach. Moreover, there are few studies on using the participatory approach for determining indicators of disaster resilience which contributes to a research-policy gap in resilience studies. The paper recommends a strong future research direction on how to translate research findings into a tool that could help communities at the local level, especially those living in small islands.
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- 2022
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5. ICRED: A multi-stakeholder approach for assessing the resilience to disaster of small island communities
- Author
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Joan Pauline Talubo, Stephen Morse, and Devendra Saroj
- Abstract
Despite the ongoing challenge of the operationalization of the concept of resilience, it has become a significant global political agenda. However, the lack of integration among the sectors involved – academia, politicians, civil society, and local practitioners, has resulted in problems in the usefulness and efficacy in the operationalisation of the concept in the grassroots. The lack of participation at the grassroots and the local practitioners’ level in developing indicators that has caused gaps in the definition, assessment, and operationalisation of the concept. The measurement of community resilience is considered a significant step towards reducing risk to disasters and increasing disaster preparedness and the capacity to adapt to various kinds of disaster. Assessment tools for resilience that were developed without the consideration of the insights, perspectives, knowledge, and experience of the stakeholders are in the danger of serving a different purpose which they were originally built for.This paper introduces the Island Community Resilience to Disasters (ICRED) approach. An approach that is integrated, taking into account the different facets of a small island community’s resilience to disasters and aggregating the various indicators under the themes of small island disaster resilience. This approach is also multi-stakeholder, considering all the perspectives of the various stakeholders that play a role in the disaster resilience of a small island community – from the communities on ground, to the local decision-makers to the experts who work in the disaster risk management field.
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- 2023
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6. Resource-Oriented Sanitation: On-Farm Septage Treatment and Nutrient Recycling for Sustainable Agriculture in the Philippine
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Carla Mae Jabar Pausta, Michael Angelo Baliwag Promentilla, Alberto Longos Jr., Aileen Huelgas Orbecido, Arnel Bas Beltran, Regina Gador Damalerio, Maria Eda Apple Suplido, and Devendra Saroj
- Abstract
Nutrient recovery technologies have been constantly developed and optimised to address challenges in water and wastewater management, sanitation, and agri-food systems, while promoting sustainable management of resources, and circular phosphorus economy. However, these technologies have been rarely explored beyond laboratory-scale in developing countries where it is mostly needed, such as the Philippines. In this study, a nutrient recovery batch reactor system was installed at a local farm to process raw septage from an onsite sanitation system, septic tank, to recover a high-value fertiliser for local crop production. The batch reactor was used for two processes; acid hydrolysis for pre-treatment of septage and chemical precipitation to recover phosphorus fertiliser (RPF). The recovered fertiliser was then applied to produce eggplants and tomatoes, which are the common crops grown in the farm. Results show that an average of 290 g of recovered RPF was produced for every 100 L of raw septage processed. With hydrolysis, 77% of the phosphate concentration were released as phosphates from the solid component of the raw septage. About 98.5% of phosphates were recovered from the hydrolysed septage. The RPF when applied to the farm’s eggplants and tomatoes have yields comparable to that of the commercial fertilisers. This study was able to demonstrate the potential of a resource-oriented sanitation system that promotes nutrient recycling toward sustainable agriculture that further leads to meeting the United Nation’s Sustainable Development Goals, particularly Zero Hunger (goal 2), Clean Water and Sanitation (goal 6), Sustainable Cities and Communities (goal 11), and Responsible Consumption and Production (goal 12).
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- 2023
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7. Practitioners’ Participatory Development of Indicators for Island Community Resilience to Disasters
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Joan Pauline Talubo, Roy Alvin Malenab, Stephen Morse, and Devendra Saroj
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Renewable Energy, Sustainability and the Environment ,Geography, Planning and Development ,Management, Monitoring, Policy and Law ,community resilience ,disaster resilience indicators ,small islands ,principal component analysis ,participatory approaches ,web-Delphi ,Batanes - Abstract
Despite the existence of a wide range of literature on indicators of disaster resilience in various geographical contexts that have been developed by different agencies and academia, not much has been done to include the insights of practitioners at the local level. This paper seeks to address the lack of practitioner insight and perspective by proposing a mixed methodology in developing composite indicators for the resilience of an island community to disasters. We used a combination of participatory approaches, such as semi-structured interviews with key informants, the web-based Delphi method, and expert interviews through a case study site in the Philippines—the Batanes island province. Principal Component Analysis (PCA) was utilized to analyse the data from web-Delphi, and the results from the content analysis of the interviews were used to support these findings. From a broad list of 144 indicators, the process identified 22 composite indicators for assessing the disaster resilience of an island community. We conclude that the development of new approaches for assessing disaster resilience of island communities is a positive step towards a better understanding and operationalization of the concept of resilience. The process followed in this paper is a significant milestone in developing new approaches to answer the question of what makes an island community resilient to disasters.
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- 2022
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8. A Review of the Impact of Conductive Materials on Antibiotic Resistance Genes During the Anaerobic Digestion of Sewage Sludge and Animal Manure
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Mac-Anthony, Nnorom, Devendra, Saroj, Lisa, Avery, Rupert, Hough, and Bing, Guo
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Environmental Engineering ,Health, Toxicology and Mutagenesis ,Environmental Chemistry ,Pollution ,Waste Management and Disposal - Abstract
The urgent need to reduce the environmental burden of antibiotic resistance genes (ARGs) has become even more apparent as concerted efforts are made globally to tackle the dissemination of antimicrobial resistance. Concerning levels of ARGs abound in sewage sludge and animal manure, and their inadequate attenuation during conventional anaerobic digestion (AD) compromises the safety of the digestate, a nutrient-rich by-product of AD commonly recycled to agricultural land for improvement of soil quality. Exogenous ARGs introduced into the natural environment via the land application of digestate can be transferred from innocuous environmental bacteria to clinically relevant bacteria by horizontal gene transfer (HGT) and may eventually reach humans through food, water, and air. This review, therefore, discusses the prospects of using carbon- and iron-based conductive materials (CMs) as additives to mitigate the proliferation of ARGs during the AD of sewage sludge and animal manure. The review spotlights the core mechanisms underpinning the influence of CMs on the resistome profile, the steps to maximize ARG attenuation using CMs, and the current knowledge gaps. Data and information gathered indicate that CMs can profoundly reduce the abundance of ARGs in the digestate by easing selective pressure on ARGs, altering microbial community structure, and diminishing HGT.
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- 2022
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9. The role of ozone combined with UVC/H
- Author
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Pello, Alfonso-Muniozguren, Ana I, Gomes, Devendra, Saroj, Vítor J P, Vilar, and Judy, Lee
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Ozone ,Hydrogen Peroxide ,Wastewater ,Oxidation-Reduction ,Abattoirs ,Water Pollutants, Chemical ,Water Purification - Abstract
The main goal of this work is to evaluate the usage of ozone (O
- Published
- 2020
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