Search

Leachate generated from landfills contains many toxic contaminants, such as dissolved organics, inorganic salts, ammonia, and heavy metals, which impact the surrounding environmental systems. This study characterized the AL-Mufarrihat Sanitary Landfill (MSL) leachate in Al-Medinah Al-Munawwarh (MM) province, Saudi Arabia, by analyzing important physicochemical parameters. Phytotoxicity was assessed using various higher plant bioassays, namely, cucumber (Cucumis sativus L.), tomato (Lycopersicum esculentum L.), cabbage (Brassica oleracea var. capitata L.), and corn (Zea mays L.). The effective concentration of seed germination represented by EC50 was calculated using a USEPA computer program based on Finney's Probit analysis method. Selected phytotoxicity test endpoint parameters, namely relative seed germination (RSG), relative root elongation (RRE), and germination index (GI) were determined. The tested leachate exhibited low concentrations of heavy metals, whereas high levels of chemical oxygen demand (COD) and ammonia nitrogen (NH3-N) were recorded. The mean EC50 values for MSL leachate exposed to B. oleracea, L. esculentum, C. sativus, and Z. mays were 2.66%, 3.12%, 4.27%, and 5.22%, respectively. These values indicate that B. oleracea was the most sensitive bioassay, whereas Z. mays was the least sensitive. All tested bioassays showed severe phytotoxic responses to the exposed higher leachate concentrations, represented by complete inhibition for RSG, RRE, and GI. Lower leachate concentrations exhibited stimulatory effects on RSG, whereas RRE and GI were hindered, even at these lower concentrations. The results revealed that although RSG and RRE were effective and promising parameters in phytotoxicity evaluation, GI was the most responsive parameter for phytotoxicity assessment. The high levels of organic and inorganic compounds in the leachate are likely the primary cause of the phytotoxicity observed in the bioassays. The results of this study highlight the pollution potential of landfill leachate in Saudi Arabia and will furnish supplementary reference information for hazard assessment and future leachate management. [ABSTRACT FROM AUTHOR]

This article explores the environmental and health implications of the construction of the Panama Canal. It highlights the significant amount of dirt and rock that was moved during the excavation and the lack of attention given to where this material was dumped. The article discusses the transformation of landscapes and the loss of wetlands and mangroves during this period. It also examines the decision-making process behind the location of dumps, which was influenced by concerns about public health and economic gain. The article emphasizes the power relations and economic concerns involved in canal construction and the impact on ecosystems in Panama. [Extracted from the article]

Copyright of Environmental & Social Management Journal / Revista de Gestão Social e Ambiental is the property of Environmental & Social Management Journal 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.)

Hydrogen plays a fundamental role in the context of decarbonization as a pillar of energy transition. It can be produced through different manners, including from residual biomass. Aiming to mitigate the effects of climate change, this study seeks to estimate Greenhouse Gas (GHG) emissions, specifically the carbon footprint of biohydrogen (Bio-H 2) derived from dark fermentation of Organic Fractions of Urban Solid Waste (OFUSW) and reforming biomethane from Landfill Gas (LFG) at landfill consortia. The goal of this study is to address the question of how Low Carbon Emission Hydrogen generation may be achieved. Population and solid waste generation projections for the next 20 years at landfill consortia in the Brazilian southeast were estimated. The potential for generating (Bio-H 2) and Life Cycle Analysis (LCA) were defined according to ABNT ISO 14040 and ABNT ISO 14044 using the two aforementioned scenarios. The results showed that the bio-H 2 potential generation from methane flows were 654, 517, 453, and 162 million m³, respectively for the states of São Paulo, Minas Gerais, Rio de Janeiro, and Espírito Santo. Moreover, the carbon footprint calculations for bio-H 2 generation showed that up to 9.23 and 18.41 gCO 2eq /MJ, respectively, are generated by producing 1.0 MJ of hydrogen via dark fermentation and the biogas reforming process. These values indicated a reduction of up to 75% for biogas reformation, and 87% for dark fermentation, compared to conventional hydrogen production from natural gas. This underscores the significance of waste energy recovery management aiming to achieve the goal of producing Low Carbon Emission Hydrogen. • Economic feasibility of leveraging H 2 from biogas for sanitary landfill in Brazil. • Two processes were analyzed: steam methane reforming and pyrolysis reforming. • Biogas production was estimated along with the production of hydrogen and ammonia. • Ammonia attainment from H 2 and the Levelized Cost of Ammonia were determined. • Installed capacity of consortia varied from 12,738.08 to 1,716,651.77 kgH 2 /year. [ABSTRACT FROM AUTHOR]

This study evaluates the efficacy of the Thiopaq bio-desulfurization system at the Daegu Bangcheon-ri Sanitary Landfill in Korea over 1 year focusing on operational insights and microbial dynamics. The system employs sulfur-oxidizing bacteria (SOBs) to convert hydrogen sulfide (H2S) in landfill gas (LFG) into elemental sulfur. Key findings include maintaining over 96% H2S removal efficiency despite operational challenges such as sulfur clogging and foam formation. Significant microbial community shifts were observed, with Thioalkalibacter halophilus remaining robust, Alkalilimnicola ehrlichii declining, and Halothiobacillus kellyi becoming more prominent, especially during new well installations with high thiol (methanethiol) concentrations. Scanning electron microscopy revealed distinct morphological characteristics of bio-sulfur under varying conditions contributing to process optimization. Our results underscore the necessity for continuous monitoring and adaptive management of microbial populations and system parameters to effectively handle fluctuating LFG compositions and operational conditions. This study provides substantial guidance for enhancing LFG quality and bio-sulfur production in large-scale landfills. [ABSTRACT FROM AUTHOR]

Application of sewage sludge as fertilizer can be beneficial for sustainable agriculture as it could largely account for nitrogen and phosphorus demand for crops and has lower costs compared to other disposal routes, e.g., incineration, and sanitary landfills. This study evaluates the feasibility of pilot-scale pelletization of sewage sludge for non-food crops (e.g., ornamental plants). The co-pelletization method was designed by mixing sewage sludge and binder (tapioca starch) at a 9:1 sludge-to-starch weight ratio. The amount of nitrogen (N), phosphorus (P), and potassium (K) of the resultant pellets were determined at 5.7%, 4.9%, and 0.2%, respectively. Following Malaysian and US Standards, non-essential elements and pathogenicity of the pelletized sewage sludge were measured below the predetermined limits and hence safe for agricultural application. The planting trial using 50% inorganic fertilizer + 50% sewage sludge pellets exhibited a promising result on the growth of the flowering plant Celosia plumosa, with having better dimension and color, 20% higher in height, 4% more chlorophyll content, 54% more leaf, 43% greater stem growth, and 27% more flowers compared to control. Likewise, the planting trial on Tagetes erecta resulted in 10.5% wider leaf, 10.6% heavier leaf dry weight, and 12.5% more chlorophyll content compared to control with full usage of inorganic fertilizer. By considering liquidities to operate the production facility, the economic analysis estimated that the production cost per ton of pelletized sewage sludge produced was USD 0.98. [ABSTRACT FROM AUTHOR]

A significant amount of municipal solid waste (MSW) generation and ineffective management can cause adverse impacts on the environment (air and water pollution) and human health. Therefore, a sustainable approach for handling MSW is required. This study aims to develop a tool to select the most promising MSW management system using the superstructure optimization technique to ensure that the selected system can achieve minimization of the total annual cost and environmental impacts. This can lead to a multi-objective superstructure optimization problem solved by using the augmented ϵ -constraint method. The developed model is based on the concept of material balance and all potential technologies include anaerobic digestion, pyrolysis, gasification, incineration, sanitary landfill, material recovery facility and composting. The proposed methodology is applied to synthesize the MSW management system in Warin Chamrap district to determine its applicability. In this research, the composition of MSW includes organics, paper, plastic, glass, and others. The results show that the Pareto-optimal solutions optimizing both total annual cost and environmental impacts can be developed. The MSW management system with the lower total annual cost tends to have the higher environmental impacts and the trade-offs between each objective can be identified so the decision-makers are able to consider before making their decision. Further investigation on sensitivity analysis reveals that the selling prices of products, annual capital cost, and operating cost factors have different degree of impacts on the waste management strategies and total annual cost. [ABSTRACT FROM AUTHOR]

There are environmental concerns (especially regarding climate change) associated with the negative effects of some pruning waste management practices. Converting urban tree waste into valuable products can help mitigate climate change, but it is important to quantify the repercussions of tree waste scenarios in an urban context. The objective of this study was to quantify the greenhouse gas (GHG) emissions for six scenarios of urban pruning waste in urban areas. To this end, the life cycle assessment methodology was applied to real data obtained from five municipalities of the Paraíba state in 2012–2021 (northeast Brazil). The six scenarios were: sanitary landfill (current practice), sanitary landfill with methane capture, municipal incineration, reuse of wood, heat generation and electricity generation. Considering the 10-year period, the sanitary landfill emitted 1048 kt CO2e, and when methane was captured at the landfill, emissions decreased to 1033 kt CO2e. The lowest emissions were associated with electricity generation, with 854 kt CO2e. The municipality of João Pessoa presented the highest emissions, followed by Cabedelo, Santa Rita, Bayeux, and Conde. Transportation was responsible for the highest share of GHG emissions. Disposal of urban pruning waste at the sanitary landfill presented the highest emissions, and it has been demonstrated herein that pruning waste can be used for the production of bioenergy, with significant potential to mitigate GHG emissions at local levels. [ABSTRACT FROM AUTHOR]

This paper deals with the kinetics of microbial cell growth, utilization of organic substrates and methane production in upflow anaerobic filters in two and three separated stages (UAF‐2SS and UAF‐3SS) treating sanitary landfill leachates, under three temperatures (20, 27, and 34°C), fed with volumetric organic loads (VOLs) for UAF‐2SS (1.8, 2.25, 2.76, 3.45, 3.71, 4.64 kgCOD (chemical oxygen demand)/m3/d) and UAF‐3SS (1.7, 2.25, 2.44, 2.6, 3.15, 3.45, 3.5, 4.57, 4.64, 6.31, 11.61, 14.18, 17.48 kgCOD/m3/d). Kinetic parameters were obtained at temperature (20–34°C), pH (8.8–9.1), each one of three stages within the UAF‐2SS and UAF‐3SS reactors containing methanogenic bacteria (Methanococcus sp., and Methanobacterium sp.) and Clostridium sp.: Maximum substrate utilization rate (rm,s) resulted in 102 mg COD/L/h, maximum microbial cell growth rate (μm) varied 102–103 CFU (colony forming units)/mL/h, methane (CH4) production rate (rm,CH4) tended to vary 100–101 mg CH4/d and the maximum production coefficient (Y) varied 0–102 CFU/mL/h/mgCOD/L/h. [ABSTRACT FROM AUTHOR]

The biosorption capacity of untreated olive stones (OS) and olive stones chemically treated (TOS) to remove COD's landfill leachate was investigated in this study. Characterization of the both biosorbents was performed using XRD, SEM, FTIR and 13C NMR techniques. Leachate was taken from Hassi Bounif Sanitary Landfill (HBSL) in Oran (Western Algeria). So, Hassi Bounif Leachate (HBL) exhibited a basic pH between 7.83 and 8.2, high COD level varying from 5,200 to 8,000 mg.L-1, low BOD5/COD ratio from 0.1 to 0.16, and high NH3-N concentrations ranged from 2,300 to 2,800 mg.L-1. Accordingly, this leachate can be classified as an intermediate leachate that is likely to stabilize. Biosorption studies were carried out in a batch system and the effects of contact time, media pH, and biosorbent mass on the removal efficiency of COD were explored. Based on results obtained at pH=11, contact times of 55 and 105 min were achieved for biosorbent masses of 0.1 g for TOS and 0.3 g for OS, respectively, and were found to be the optimal operating conditions for HBL treatment. Thus, the highest COD removal efficiencies of 79.94 and 67.04% were reached for TOS and OS, correspondently. The pseudo-second order model was the best fitted to our experimental data with high regression coefficients (R2 ≥ 0.98). The Langmuir isotherm model adequately represented the COD removal process, with a maximum adsorption capacity of 90.91 mg.g-1 for TOS and 31.25 mg.g-1 for OS at T=50°C and pH=11. The thermodynamic parameters indicated that the biosorption process was feasible, spontaneous, and endothermic. These findings suggested that TOS might be employed as an inexpensive and effective biosorbent for COD removal from stabilized leachate. They can also provide baseline information and design assistance for a leachate treatment plant at the HBSL site, as well as for any sanitary landfill in Algeria. [ABSTRACT FROM AUTHOR]

In this study, we evaluated the utilization rate of organic substrates contained in sanitary landfill leachates (SLLs) by fixed and suspended biomass reactors. Five bioreactors were designed, constructed, and tested for chemical oxygen demand (COD) removal. We applied three levels of organic loading in the influent for each bioreactor, including (1) a rotating biological contactor (RBC) (12, 20, and 25 g COD/m2/day); (2) a trickling filter (TF) (2.67, 5.33, and 8 kg COD/m3/day); (3) an upflow anaerobic sludge blanket (UASB) (13.31, 15.98, and 18.65 kg COD/m3/day); (4) an upflow anaerobic filter in two separated stages (UAF-2SS) (3.71, 2.76, and 1.8 kg COD/m3/day); and (5) an upflow anaerobic filter in three separated stages (UAF-3SS) (2.25, 3.45, and 4.44 kg COD/m3/day). Two equations for predicting the substrate utilization rate (SUR) of organic compounds by microorganisms were calibrated and validated, modeled under a nonsteady state condition. We modified Monod's equation to obtain the significant organic SUR and COD removal efficiency by the biomasses. These kinetic parameters were performed by the microorganisms fixing controlled experimental conditions for pH (8–9) and temperature for the UAFs (20°C, 27°C, and 34°C) and the remaining reactors (18°C– 20°C). The SUR and COD removal efficiency results were as follows: for UASB, −400 to −800 mg/L/h , 70% to 85%; for UAF-3SS, −100 to −300 mg/L/h , 85% to 95%; for UAF-2SS, −100 to −200 mg/L/h , 70% to 85%; and for RBC and TF, −50 to −250 mg/L/h , 70% to 80%. The results were mainly influenced by the structural arrangement of the organic compounds being biodegraded and the geometric configurations of the bioreactors in multiple separated stages, allowing the influence of the solubility of the recalcitrant substances, which varied from 7 to 14:1 COD dilition, to obtain subinhibitory levels for the microbial metabolism and achieve a high COD removal efficiency. Practical Applications: Two of the five bioreactors evaluated in this study, the upflow anaerobic filter in two separated stages and the upflow anaerobic filter in three separated stages, are proposed and designed as innovative reactors for treating groundwater from tropical aquifers contaminated with hydrocarbons. Additionally, UAFs were configured in a coupled bioreactor arrangement (i.e., a sequencing batch reactor followed by UAFs) to restore water quality by removing organic compounds in tropical rivers. By comparing the five bioreactors, the capacity for the chemical oxygen demand removal was significant related to the organic substrate utilization rate (SUR) for treating sanitary landfill leachates with low recalcitrance levels (i.e., rapidly biodegradable). Rapidly biodegradable SLLs can be associated with La Cortada-SLL percolated from the cells/trenches excavated for the disposal of municipal solid waste (MSW) (i.e., Pamplona Municipality, Colombia) due to the contents of a high fraction of putrescible wastes (67%) and a high biochemical oxygen demand/chemical oxygen demand ratio (62%). This level ratio produced a suitable SUR obtained from the microbial metabolism starting with the upflow anaerobic sludge blanket reactor (−400 to −1,200 mg/L/h) followed by the remaining bioreactors (−150 to −350 mg/L/h). Upflow anaerobic filters in multiple separated stages reactors constitute a feasible technical option for overcoming medium to high recalcitrance levels in SLLs obtained from cells/trenches excavated storing around 25% components fraction (e.g., metals, plastics, rubber, leather, textiles). [ABSTRACT FROM AUTHOR]

Copyright of Environmental & Social Management Journal / Revista de Gestão Social e Ambiental is the property of Environmental & Social Management Journal 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 research demonstrates changes in the behaviors and characteristics of sintered bricks while using industrial sludge ash (ISA) and waste glass (WG) as a replacement for clay in the brick manufacturing procedure. Owing to the limited amount of available land in Taiwan, it is becoming increasingly difficult to locate suitable sites for sanitary landfills, which is a common final disposal method for ash that is produced during thermal treatment in sludge factories. To meet the urgent need for land, the final waste disposal must convert this waste into a new resource. This research investigated the feasibility of using general industrial sludge ash waste, due to its abundance and high potential as a raw material in producing bricks. The result of this study shows that the bricks made from ISA and WG under a certain mixture proportion (ISA50%/WG40%/Clay10%) had excellent industrial potentials, such as compressive strength and water absorption rate. However, owing to the wide variety of components from different sources of ISA, the mixture proportion might vary accordingly. This study also analyzed the incineration index, proportion design, and process improvement, as well as investigating the possibility of increasing the total use of sludge ash as a resource. This study shows the potentials of utilizing wastes as raw materials in industrial manufacturing procedures. Therefore, more wastes can be tested and turned into resources in the future. [ABSTRACT FROM AUTHOR]

This study presents an analysis of soil contamination caused by Ni, Zn, Cd, Cu, and Pb at municipal solid waste (MSW) landfills, with a focus on ecological risk assessment. The approach aims to assess how different landfill practices and environmental conditions affect soil contamination with potentially toxic elements (PTEs) and associated environmental risks. Soil samples were collected from MSW landfills in Poland and the Czech Republic. The research included a comprehensive assessment of PTEs in soils in the context of global environmental regulations. The degree of soil contamination by PTEs was assessed using indices: Geoaccumulation Index (Igeo), Single Pollution Index (Pi), Nemerow Pollution Index (PN), and Load Capacity of a Pollutant (PLI). The ecological risk was determined using the Risk of PTEs (ERi) and Sum of Individual Potential Risk Factors (ERI). The maximum values of the indicators observed for the Radiowo landfill were as follows: Igeo = 4.04 for Cd, Pi = 24.80 for Cd, PN = 18.22 for Cd, PLI = 2.66, ERi = 744 for Cd, ERI = 771.80. The maximum values of the indicators observed for the Zdounky landfill were as follows: Igeo = 1.04 for Cu, Pi = 3.10 for Cu, PN = 2.52 for Cu, PLI = 0.27, ERi = 25 for Cd, ERI = 41.86. The soils of the tested landfills were considered to be non-saline, with electrical conductivity (EC) values less than 2,000 μS/cm. Varying levels of PTEs were observed, and geostatistical analysis highlighted hotspots indicating pollution sources. Elevated concentrations of Cd in the soil indicated potential ecological risks. Concentrations of Cu and lead Pb were well below the thresholds set by the environmental legislation in several countries. In addition, Ni concentrations in the soils of both landfills indicated that the average levels were within acceptable limits. Principal Component Analysis (PCA) revealed common sources of PTEs. The identification of specific risk points at the Radiowo and Zdounky sites contributes to a better understanding of potential hazards in landfill environments. By establishing buffer zones and implementing regular maintenance programs, emerging environmental problems can be addressed in a timely manner. [ABSTRACT FROM AUTHOR]

The Brazilian National Policy on Solid Waste assigned a key role to the Municipalities in achieving its goals, which are: to reduce waste generation, promote its integrated management, and the environmentally appropriate disposal of waste. The Municipality of Foz do Iguaçu met the main requirements of the national policy law, since it published the Municipal Plan for Integrated Solid Waste Management in 2012, closed the "dump" in 1992, and installed sanitary landfill in 2001. However, some policy instruments - such as reverse logistics and the organization of collector's associations - still need to be evaluated. The article analyzes the implementation of the public policy of solid waste in Foz do Iguaçu (PR), through a model of indicators, to prepare a diagnosis of municipal solid waste management. [ABSTRACT FROM AUTHOR]

Copyright of Revista de Arqueologia is the property of Revista de Arqueologia 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 efforts to encourage sustainable development have brought to attention the use of secondary materials in civil engineering applications. Global experimental data suggest that municipal solid waste (MSW) incineration bottom ash (IBA) can potentially replace natural aggregates in field applications. However, IBA is currently disposed in open dumps or sanitary landfills in India. Assessing contaminant leaching from IBA is crucial to ascertain its options for disposal or reuse. The current study analyzes the mineralogy, chemical constituents, organic content, and leaching of contaminants from IBA collected from two incineration plants in Delhi. The study takes into consideration the effect of particle size, liquid-to-solid (L/S) ratio, and pH on contaminant leaching. The experimental results revealed that the leaching concentration of contaminants and organic content of IBA decreases with an increase in particle size. A considerable influence of pH was noted on the leaching of all contaminants except chlorides, sulfates, and antimony. The results further indicate that IBA is suitable for disposal in non-hazardous waste landfills regardless of particle size at its intrinsic pH. However, it is recommended to dispose IBA in monofils as co-disposal with MSW in sanitary landfills can cause the pH of IBA to shift toward the acidic range, which may exacerbate the contaminant leaching from IBA. The comparison of leaching test results with international regulatory standards for reuse demonstrates that using IBA in unbound applications is feasible in paved roads and earthworks subjected to minimal infiltration of water. [ABSTRACT FROM AUTHOR]

Approximately 95% of urban solid waste worldwide is disposed of in landfills. About 14 million metric tonnes of this municipal solid waste are disposed of in landfills every year in Malaysia, illustrating the importance of landfills. Landfill leachate is a liquid that is generated when precipitation percolates through waste disposed of in a landfill. High concentrations of heavy metal(loid)s, organic matter that has been dissolved and/or suspended, and inorganic substances, including phosphorus, ammonium, and sulphate, are present in landfill leachate. Globally, there is an urgent need for efficient remediation strategies for leachate-metal-contaminated soils. The present study expatiates on the physicochemical conditions and heavy metal(loid)s' concentrations present in leachate samples obtained from four landfills in Malaysia, namely, Air Hitam Sanitary Landfill, Jeram Sanitary landfill, Bukit Beruntung landfill, and Taman Beringin Landfill, and explores bioaugmentation for the remediation of leachate-metal-contaminated soil. Leachate samples (replicates) were taken from all four landfills. Heavy metal(loids) in the collected leachate samples were quantified using inductively coupled plasma mass spectrometry. The microbial strains used for bioaugmentation were isolated from the soil sample collected from Taman Beringin Landfill. X-ray fluorescence spectrometry was used to analyze heavy metal(loid)s in the soil, prior to the isolation of microbes. The results of the present study show that the treatments inoculated with the isolated bacteria had greater potential for bioremediation than the control experiment. Of the nine isolated microbial strains, the treatment regimen involving only three strains (all Gram-positive bacteria) exhibited the highest removal efficiency for heavy metal(loid)s, as observed from most of the results. With regard to new findings, a significant outcome from the present study is that selectively blended microbial species are more effective in the remediation of leachate-metal-contaminated soil, in comparison to a treatment containing a higher number of microbial species and therefore increased diversity. Although the leachate and soil samples were collected from Malaysia, there is a global appeal for the bioremediation strategy applied in this study. [ABSTRACT FROM AUTHOR]

Copyright of Environmental & Social Management Journal / Revista de Gestão Social e Ambiental is the property of Environmental & Social Management Journal 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.)

Compacted clay is often used as a sanitary landfill liner due to its impermeable characteristics. However, compacted clay is susceptible to shrinkage as the temperature changes, which may affect the permeability due to the development of shrinkage cracks. Thus, clay was mixed with polyurethane, a stable polymer, once the reaction was completed. The polyurethane-clay mixture was compacted wet of the optimum moisture content and monitored through several moisture contents using direct measurement of the specimen diameter by Vernier caliper. The study inferred that the ratio of the lateral shrinkage of the compacted polyurethane-clay mixture is significantly less than that of the clay specimen with the same initial void ratio. Hence, the changes in the soil structure induced by the addition of polyurethane into the compacted mixture increased the resistance of the soil mass from lateral shrinkage quantified using the free shrinkage ratio. Furthermore, the regression model of the free shrinkage ratio for a wide variety of moisture content was also presented for the compacted polyurethane clay and compacted clay. [ABSTRACT FROM AUTHOR]

This study aims to determine the COD, NH3-N and turbidity disposal efficiencies from leachate in the Bingöl landfill and highlight the electrocoagulation (EC) process's performance in removing these pollutants. After establishing that landfill leachate was intermediate aged, its characteristics were identified using physical, chemical and elemental analyses. Six parallel-connected electrode plates with stainless steel as the cathode and aluminium as the anode were used to construct an electrocoagulation cell. After a 40-min treatment interval, the optimal disposal efficiencies for COD and turbidity from the leachate were determined to be 87% and 62%, respectively, at pH 5. Following a 40-min reaction, BOD5 concentration and BOD5/COD ratio were determined to be 85.75 mg O2/L and 0.64, respectively, at pH 5. At a NaCl concentration of 10 mM, the optimum disposal efficiency for NH3-N was determined to be 33%. The reaction kinetics matched pseudo-first-order (PFO) kinetics due to high correlation coefficients (R2 = 0.93–0.99) in removing COD, NH3-N and turbidity under different experimental conditions. The optimal reaction rate constants were determined as 2.93 × 10−2 min−1, 1.92 × 10−2 min−1 and 7.3 × 10−3 min−1 for the disposal of COD, NH3-N and turbidity, respectively. Energy consumption, unit energy consumption and total consumption cost rose in the EC process when the current density was augmented from 15 to 25 mA/cm2. [ABSTRACT FROM AUTHOR]

The increase of the urban population in the world and the associated economic expansion have accelerated municipal solid waste (MSW) production. About 40% of the world's waste is disposed of inappropriately in open dumps and/or only partially controlled landfills. Many types of waste are mixed and disposed without treatment in illegal dumpsites or non-sanitary landfills, especially in developing countries such as Brazil. This research aims to identify areas for the implementation of landfills in the tropical climate of the Metropolitan Region of Salvador (MRS), Brazil, which generates approximately 4900 tons of MSW per day. In a first step, geographic information system (GIS) is used to apply Boolean logic to 15 restrictive criteria based on Brazilian legislation. In a second step, locations found to be legally appropriate are ranked with the analytic hierarchy process (AHP) in a multi-criteria decision approach using 11 non-restrictive criteria based on technical knowledge and literature. Results show that 6% of the areas are classified as highly suitable, 16% as suitable, 9% not suitable, and 69% with legal restrictions. The result of this study serves as a guide for suitably siting landfills in the MRS and similar regions in the world, reducing costs and biased assessments potentially implied by empirical methods. [ABSTRACT FROM AUTHOR]

Copyright of Environmental & Social Management Journal / Revista de Gestão Social e Ambiental is the property of Environmental & Social Management Journal 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.)

Disposal of solid wastes through landfill becomes more expensive and has shortened the lifespan of the landfill as the generation of waste is increasing rapidly. In addition, the construction of new landfills becomes a constraint due to the lack of sufficient site, rising land prices, and increasing demands. Some factors such as the population growth, less sanitary landfill, and poor management of solid waste led to difficulties in treating large amounts of leachate. Due to the leachate infiltrating into the soil, it can pollute the groundwater and affect the nature that is located around the dumping site. In order to detect the movement of leachate in landfill and to determine the contamination area of leachate, the electrical resistivity method is more suitable to use in terms of cost and time required. The aim of this research is to determine the properties of heavy metal in soil, analyse electrical resistivity method using Schlumberger configuration, and determine and produce the subsurface profile of electrical resistivity mapping for leachate at Krubong landfill. The soil characteristics were determined using XRF. From the result, the highest heavy metal concentration in a sample from Krubong landfill site is barium (Ba) followed by zirconium (Zr), and vanadium (V). The study was focused on the application of the geophysics method by electrical resistivity in survey work using a Terrameter SAS4000 imaging system to produce a subsurface profile of the Krubong landfill. Three spread lines were successfully installed and applied at the site to get the subsurface profile of the site. According to the resistivity result, there are some spots at the subsurface of the site that show the leachate plume. Therefore, the movement of leachate can be determined and will assist in the improvement of landfill management and treatment purposes. [ABSTRACT FROM AUTHOR]

The controlling microplastics (MPs) at source is a management method that can effectively reduce the amount of contamination in the environment. The main source of MPs was landfills that the decomposition of solid waste, MPs has an impact on environmental quality especially the health of humans. This research was investigated of MPs contamination at landfill site in the Muangpak municipality for analysis of MPs quantitative and source apportionment of MPs. The results of the composition of municipal solid waste by quartering method found that biodegradable solid waste was as high as 36.27% followed by general solid waste of 35.97% which was mostly plastic waste and effect the contamination of MPs in the environment. The distribution of MPs in environmental found that highest abundance was 66.44% of leachate sludge pond 1 followed by leachate sludge pond 2 (26.30%), sediment of surface water (3.32%), leachate pond 1 (1.04%), leachate pond 2 (0.80%), groundwater point 3 (0.62%), groundwater point 1 (0.58%), surface water (0.53%) and groundwater point 2 (0.37%). The contamination of polymer types of MPs at higher densities of low density polyethylene (LDPE) and high density polyethylene (HDPE) than polypropylene (PP) was found in samples closest to landfill area especially leachate pond more than 90%. The source apportionment of MPs using statistical analysis found that plastic waste has correlated to occurrence of LDPE and plastic bottle waste has correlated to occurrence of HDPE that both types of plastic waste are related to the amount of general solid waste and recycle solid waste increases every year. [ABSTRACT FROM AUTHOR]

The use of heterogeneous Fenton process combined with biological and physical treatment of sanitary landfill leachate has been evaluated. Leachate used in this study was collected from the drainage system of a landfill in Borg El-Arab city – Egypt. As a pre-treatment step, the collected leachate was subjected to ammonia stripping at pH 10.0 for 6 h to reduce the ammonia toxicity for the subsequent biological treatment steps. In this step, over 80% of the ammonia content of the leachate could be removed. Then, the ammonia-stripped leachate was subjected to heterogeneous Fenton process or to aerobic biological treatment. At its optimum operating conditions namely; 37.18 g/L H2O2, 5 g/L catalyst and a reaction time of 4 h, the use of heterogeneous Fenton process achieved COD removal up to 73%. Corresponding COD removal obtained after biological treatment was 68%. To select the best sequence of the treatment steps, the ammonia-stripped sanitary landfill leachate was subjected to two treatment trains. The first one was biological treatment followed by heterogeneous Fenton process; while, the second was heterogeneous Fenton process followed by biological treatment. The highest reductions of the organic compounds and ammonia were achieved after using biological treatment followed by the heterogeneous Fenton process. The use of this treatment configuration achieved total COD, BOD and NH4-N removals of 88%, 84% and 96% respectively. Accordingly, the proposed treatment train can be considered effective in the treatment of landfill leachate and environmental protection. [ABSTRACT FROM AUTHOR]

The leachate discharges generated in sanitary landfills contain many pollutants that are harmful to the environment; treatments are scarce and should be carried out better. The use of coagulation–flocculation processes has been one of the most widely used, but due to the complexity of the characterization of the leachate, the dosing strategy of coagulants and biopolymers needs to be clarified. Therefore, the present study was carried out to determine the doses of coagulants and biopolymers suitable for coagulation–flocculation processes in the treatment of leachates using computational models of machine learning techniques such as artificial neural networks (ANNs); these allow for decreasing the operations of the tests of jars in the laboratory, optimizing resources. Through laboratory experimentation, there are real results of the effectiveness of applying biopolymers in leachate treatments at different concentration levels. The laboratory results were taken as input variables for the algorithms used; after the validation and calibration process, we proceeded to estimate predicted data with the computational model, obtaining predictions of optimal doses for treatment with high statistical adjustment indicators. It is verified that the applied coagulation–flocculation treatments reduce the turbidity values in the leachate and contaminants associated with suspended solids. In this way, the jar tests are optimized so that the operational costs decrease without affecting the results of adequate dosing. [ABSTRACT FROM AUTHOR]

The sustainable management of landfill leachates remains a matter of important concern in many countries. We used as case study a medium-sized Greek landfill, and we initially investigated the performance of the existing secondary leachate treatment system. The activated sludge process removed chemical oxygen demand (COD), biochemical oxygen demand (BOD), NH4-N, and PO4-P by 55%, 84%, 94%, and 14%, respectively, but the effluents did not meet the legislation requirements for discharge or reuse. Afterwards, different management options of these effluents (co-treatment with sewage in the centralized treatment plant, onsite tertiary treatment with reverse osmosis, granular activated carbon (GAC), ozonation, photo-Fenton, or constructed wetlands) were evaluated regarding their operational costs and environmental footprint. The use of constructed wetlands presented the lower operational cost, energy requirements, and greenhouse gas (GHG) emissions, not exceeding 21.5 kg CO2eq/day. On the other hand, the power consumption and the GHG emissions of the other on-site technologies ranged from 0.37 kWh/m3 and 5.56 kg CO2eq/day (use of GAC) to 39.19 kWh/m3 and 588.6 kg CO2eq/day (use of ozonation), respectively. The co-treatment of the leachates with municipal wastewater required 0.6 kWh/m3 and emitted 30.18 kg CO2eq/day. For achieving zero-discharge of the treated leachates, a system consisting of constructed wetlands and evaporation ponds in series was designed. [ABSTRACT FROM AUTHOR]

A of the major problems nowadays is the final allocation of solid waste. In this perspective, the question about the conditions of how these residues within the state of Roraima were disposed, became a concern, so this work sought to characterize the environmental scenario of the solid waste disposal areas in the municipalities of the State. For this purpose, the Waste Landfill Quality Index in Trenches and Dumps-IQR-Ditches/Dumps was used as an indicator of environmental quality, a form adapted from the Waste Landfill Quality Index-IQR, which is a methodological instrument created and used by the Environmental Company of the State of São Paulo. This form was completed using on-site visits, photographs, remote sensing images and data obtained from the environmental agencies of each municipality through a standardized questionnaire as a source. The collected information was quantified by scoring criteria, classifying as inadequate, controlled and adequate areas. Thus, it was concluded that none of the municipalities in the State reached a score higher than 8.1, an area that would be classified under appropriate conditions and in accordance with the provisions of the National Policy on Solid Waste. Under controlled conditions, only the municipality of Normandia scored the equivalent of 6.7, as it has a small sanitary landfill in accordance with the standards of ABNT/NBR 15849/2010. Thus, the other Municipalities function in inadequate conditions, not meeting the current legislatures and configuring a mere disposition in the open. [ABSTRACT FROM AUTHOR]

Leachates are produced as a filtrate from waste landfills as a result of highly polluted waters. Organic substances that are mostly present are: phenolic compounds, halogen organic substances, oils and fats. The presence of nitrogen substances is significant, followed by phosphoric substances, sulfates, chlorides, and heavy metals. Sanitary landfill "Smiljevići", created 60 years ago, is placed on the hill area of Novi Grad municipality, Sarajevo. In that time area around landfill was very sparsely populated. Following the legislative, the leachate from the Smiljevići landfill does not have a good environmental status. On the other hand, according to global - typical values, contaminant concentrations are much closer to low than average values. The content of contaminants with long retention in nature and tendency to bioaccumulation is within legal limits. Most parameters that exceed the permitted values include usually biodegradable compounds that the stream of the river Bosnia can absorb better than the small ecosystem of the Lepenički creek. The problem is further aggravated bz the fact that the area surrounding the creek is now relatively densely populated, the stream has a small water capacity, especially in the summer, and the contaminants are mostly volatile. Finally, this problem also can be attributed to irresponsible activity of urban planning. [ABSTRACT FROM AUTHOR]

Heavy metal contamination poses severe threats to ecosystems and human health, necessitating effective remediation strategies. Phytoremediation, which leverages plants to remove heavy metals, offers a promising solution. However, this approach remains underexplored, particularly in tropical ecosystems like Malaysia. Thus, this study examines the potential of native plant species in addressing heavy metal pollution, at Air Hitam Sanitary Landfill (AHSL). This location was selected due to it being an urban ecosystem that is susceptible to soil heavy metal contamination from municipal waste disposal and atmospheric deposition. Native plant species, namely Pueraria phaseoloides, Dicranopteris linearis, Cyperus rotundus, Acacia spp., and Melastoma malabathricum were found to grow well at AHSL, thus were selected for this study. The phytoremediation potential of these plant species were determined by calculating their translocation (TF) and bioaccumulation factors (BCF). Based on the TF and BCF values of all the plants studied, none of the plant species were potential phytoremediators. However, four plant species were identified as potential bioindicators of Cd. These species were Pueraria phaseoloides, Cyperus rotundus, Acacia spp. and Melastoma malabathricum. In conclusion, this study underscores the importance of understanding phytoremediation potential within challenging environments and its contribution to heavy metal mitigation. By investigating native plant species in AHSL, the research aids in expanding the application of phytoremediation strategies, ultimately fostering ecological restoration, and safeguarding human health. [ABSTRACT FROM AUTHOR]

Sanitary landfills are the most used way to dispose of the garbage generated in the country. In landfills, it is essential to know the amount of waste that is collected and disposed of, as well as its characteristics, such as density, composition, humidity, and calorific value, to design collection, transport, and final disposal systems. This work aims to determine the economic and environmental potential of the methane gas production of generated clean energy in a landfill in Mexico. This work considers standards developed for measuring gases released into the environment. An in situ sampling was carried out in a sanitary landfill in 36 biogas wells using a GA5000 analyzer. The emission of 28,965 tons of methane gas and 83,244 tons of carbon dioxide per day is estimated at the landfill. A negative externality can become positive when the use of solid urban waste produces electrical energy by capturing the greenhouse gases generated in the decomposition of the waste present in the landfill. [ABSTRACT FROM AUTHOR]

The management of solid waste is one of the biggest challenges for sustainability. Aiming at gains of scale, guaranteeing universal access and the technical and economic viability of the services, intermunicipal cooperation has been implemented in several countries, and in Brazil, it presents itself as one of the main instruments of public policies in the sector of sanitation. The main objective of this article is to propose a set of indicators and the construction of an index to evaluate the performance of regionalized management of urban solid waste, applying them to intermunicipal public consortia operating in Brazil. Based on the Delphi methodology, a total of 15 indicators were defined, divided into 5 sustainability dimensions, used for the construction of the Regionalized Urban Solid Waste Management Performance Index (IDGRSU). In Brazil, the performance of regionalized management was classified as Regular for most of the operating consortia analysed. The adequacy of the final disposal in regional sanitary landfills is the common practice among the municipalities, and consequently, the reduction of the areas of dumps represents the main advance in the management. The index developed proved to be an important instrument to support municipalities and consortia for waste management, contributing to the implementation of sustainable strategies and to the development of policies, and its application in other countries is feasible, regardless of the size of the municipalities. [ABSTRACT FROM AUTHOR]

The present study proposes an alternative gelatin extraction method from waste materials generated by tanneries, including trimmings, offcuts, and leather scraps. These industrial byproducts yield substantial monthly volumes that are managed by an environmental entity and disposed of in a sanitary landfill. To harness the potential of these waste materials, experimental techniques were employed, involving protein analysis, assessment of response to varying concentrations of acetic acid, and the application of various treatments to individual samples. The objective was to maximize yield and minimize ecological impact. The most effective treatment was found to be T16 (1 mole of acid per liter) for trimmings, T12 (0.8 moles of acid per liter) for offcuts, and T8 (0.7 moles of acid per liter) for leather scraps. Approximately 90% of the obtained protein values correspond to collagen, with a more pronounced presence in the trimmings samples. [ABSTRACT FROM AUTHOR]