Waste management最新文献_第5页

Solid waste based manufactured soil – Stabilization of “organics-microorganisms-inorganic skeleton” and performance evaluation

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-03-11 DOI: 10.1016/j.wasman.2025.114738

Jun Chen , Qingyi Li , Jianbo Zhang , Hao Zhou , Siwei Peng , Shufeng Qiao , Hang He , Kewei Li , Dongsheng Wang , Weijun Zhang

{"title":"Solid waste based manufactured soil – Stabilization of “organics-microorganisms-inorganic skeleton” and performance evaluation","authors":"Jun Chen , Qingyi Li , Jianbo Zhang , Hao Zhou , Siwei Peng , Shufeng Qiao , Hang He , Kewei Li , Dongsheng Wang , Weijun Zhang","doi":"10.1016/j.wasman.2025.114738","DOIUrl":"10.1016/j.wasman.2025.114738","url":null,"abstract":"<div><div>The safe disposal and utilization of bulk solid waste (SW) are critical challenges. Manufactured soil, a soil-like material composed of SW, offers a novel solution for resource recycling. However, the mechanisms underlying SW-based manufactured soil fertility development remain unclear. This study systematically investigated the performance of SW-based manufactured soil using aerobic compost sludge (ACS-soil) and anaerobic digestion sludge (ADS-soil), focusing on the microbial mechanism which driving manufactured soil fertility development. Results showed that the soil nutrient index (SNI) of SW-based manufactured soil was 5 to 8 times higher than that of natural topsoil. These soils significantly promoted wheatgrass growth. However, ACS-soil exhibited superior fertility and plant performance, maintaining stable nutrient levels, whereas the SNI value and soil pH of ADS-soil decreased by 27.13% and 17.68% respectively. Microbial community analysis revealed that homogeneous selection in ACS-soil drove microbial community succession, maintaining stable nutrition content and increasing humification degree. In ADS-soil, the rich in labile compounds (accounting for 41%) led to lower environmental stress, stochastic processes dominated bacterial succession, which driving declined pH and thus negatively impact the soil fertility. Furthermore, based on life cycle analysis results, using SW to prepare manufactured soils had lower carbon emissions than conventional disposal methods (including safe landfill, incineration and direct land use), which demonstrated that SW-based manufactured soil is a promising method for SW disposal. This research underscores the potential of SW-based manufactured soil for waste disposal and enhanced plant growth, emphasizing the importance of selecting appropriate organic components to optimize soil performance.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"200 ","pages":"Article 114738"},"PeriodicalIF":7.1,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring the potential of chemical recycling using a distributed model in the UK – A life cycle assessment perspective

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-03-08 DOI: 10.1016/j.wasman.2025.02.052

Suviti Chari, Andrea Paulillo, Massimiliano Materazzi

{"title":"Exploring the potential of chemical recycling using a distributed model in the UK – A life cycle assessment perspective","authors":"Suviti Chari, Andrea Paulillo, Massimiliano Materazzi","doi":"10.1016/j.wasman.2025.02.052","DOIUrl":"10.1016/j.wasman.2025.02.052","url":null,"abstract":"<div><div>The study investigates the potential of chemical recycling of plastic waste in the UK, specifically through a small-scale, decentralised pyrolysis process that incorporates in-situ upgrading. With rising plastic production and limited capacity for mechanical recycling, chemical recycling (CR) emerges as a complementary solution for handling complex waste streams, such as multi-layered or contaminated plastics. The research focuses on the life cycle assessment (LCA) of a 165 kg/hr plant designed to convert mixed plastic waste (MPW) into naphtha, which can be used as a substitute of virgin petroleum feedstock in the production of plastic films. The LCA evaluates both waste and product perspectives, comparing chemical recycling with conventional waste management methods, including incineration with energy recovery (waste-to-energy) and a mixed end-of-life scenario (waste perspective) and with virgin plastic film (product perspective). Results show that chemical recycling significantly reduces climate change impacts—by 1284 kg CO<sub>2</sub>-eq./tonne compared to waste-to-energy and by 430 kg CO<sub>2</sub>-eq./tonne against the mixed end-of-life option. From the product perspective, chemically recycled naphtha results in up to 2977 kg CO<sub>2</sub>-eq./tonne or 636 kg CO<sub>2</sub>-eq./tonne lower impacts compared to virgin plastic production. The study highlights the use of small-scale, decentralised CR plants, however, challenges remain, such as the environmental impacts of by-products. The research concludes that chemical recycling offers a viable pathway to greenhouse gas emissions reductions compared to conventional waste management and virgin plastic production, albeit with interlinked trade-offs observable in other impact categories, highlighting that further optimisation and policy support are essential.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"199 ","pages":"Pages 13-24"},"PeriodicalIF":7.1,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sustainable use of fly ash waste in tire tread rubber: Characterization of physical properties and environmental impact assessment

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-03-08 DOI: 10.1016/j.wasman.2025.114737

Hassarutai Yangthong , Papawarin Udomsin , Siriwan Jansinak , Supitta Suethao , Kheng Lim Goh , Wirasak Smitthipong

{"title":"Sustainable use of fly ash waste in tire tread rubber: Characterization of physical properties and environmental impact assessment","authors":"Hassarutai Yangthong , Papawarin Udomsin , Siriwan Jansinak , Supitta Suethao , Kheng Lim Goh , Wirasak Smitthipong","doi":"10.1016/j.wasman.2025.114737","DOIUrl":"10.1016/j.wasman.2025.114737","url":null,"abstract":"<div><div>This study explores the use of fly ash (FA), a waste material, to partially replace zinc oxide (ZnO) as an activator in tire tread processing. Reducing ZnO addresses its environmental risks, particularly the impact of ZnO leakage into aquatic ecosystems throughout the tire’s life cycle. The FA was altered by including rubber compound with and without ZnO, using ZnO-to-FA ratios of 3:0 (control), 2:1, 1:2, 0:3, or 0:5 parts per hundred of rubber (phr). The results show that crosslinking of the rubber compound occurred with FA, even in the absence of ZnO. Notably, sample recipes with ZnO-to-FA ratios of 2:1 and 1:2 phr had similar Δ torque values to the control (3:0), allowing for ZnO reductions of 33.7% and 67.0%, respectively. This effectiveness is likely due to metal oxides in FA, such as CaO, MgO, Al<sub>2</sub>O<sub>3</sub>, and Fe<sub>2</sub>O<sub>3</sub>, which support the vulcanization process. Additionally, tensile strength and modulus remained unchanged. Elemental analysis further indicated that a ZnO-to-FA ratio of 1:2 reduced zinc release by 63.0% compared to the control recipe. A gate-to-gate life cycle assessment revealed that replacing ZnO with FA in vulcanized rubber formulations reduces environmental impacts, with the lowest effects observed at the 0:3 ZnO:FA ratio, though higher FA content may increase impacts. Using FA as a partial replacement for ZnO in tire tread processing shows promise for reducing environmental impact in tire manufacturing by lowering zinc release, decreasing ecotoxicity, and promoting waste reduction through the recycling of fly ash.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"200 ","pages":"Article 114737"},"PeriodicalIF":7.1,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143578149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Generalization abilities of foundation models in waste classification

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-03-06 DOI: 10.1016/j.wasman.2025.02.032

Aloïs Babé , Rémi Cuingnet , Mihaela Scuturici , Serge Miguet

{"title":"Generalization abilities of foundation models in waste classification","authors":"Aloïs Babé , Rémi Cuingnet , Mihaela Scuturici , Serge Miguet","doi":"10.1016/j.wasman.2025.02.032","DOIUrl":"10.1016/j.wasman.2025.02.032","url":null,"abstract":"<div><div>Industrial waste classification systems based on computer vision require strong generalization abilities across location and time period in order to be deployed. This study investigates the potential of foundation models, known for their adaptability to a wide range of tasks and promising generalization capabilities, to serve as the basis for such systems. To evaluate the generalization performance of foundation models we use five waste classification datasets spanning various domains, train the models on one dataset and test them on all others. Additionally, we explore various training procedures to optimize foundation model adaptation for this specific domain. Our findings reveal that foundation models exhibit superior generalization abilities compared to standard models and that good generalization performance is correlated with the model size and the size of the model pretraining dataset. Furthermore, we demonstrate that elaborate classifier heads are not necessary for extracting discriminative features from foundation models. Both standard fine-tuning and Parameter-Efficient Fine-tuning (PEFT) improve generalization performance, with PEFT being particularly effective for larger models. Simple data augmentation techniques were found to be ineffective. Overall, application of foundation models to industrial waste classification holds very promising results.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"198 ","pages":"Pages 187-197"},"PeriodicalIF":7.1,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recovery and recycling of silica fabric from waste printed circuit boards to develop epoxy composite for electrical and thermal insulation applications

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-03-06 DOI: 10.1016/j.wasman.2025.02.017

E.I. Anjana , K Aiswariya , K.P. Prathish , Sushanta K Sahoo , K Jayasankar

{"title":"Recovery and recycling of silica fabric from waste printed circuit boards to develop epoxy composite for electrical and thermal insulation applications","authors":"E.I. Anjana , K Aiswariya , K.P. Prathish , Sushanta K Sahoo , K Jayasankar","doi":"10.1016/j.wasman.2025.02.017","DOIUrl":"10.1016/j.wasman.2025.02.017","url":null,"abstract":"<div><div>Printed Circuit Boards (PCBs), a primary component of electronic waste (E-waste), contain silica fabric as a major non-metallic material, which needs to be reutilized for high-performance applications. This study focuses on the separation and recovery of silica fabrics through pyrolysis and their subsequent use in developing silica fabric-epoxy composites (SFR). Extracted silica fabric was characterized through FTIR, XRD, XPS, and SEM for morphology analysis. Subsequently, silica fabric was incorporated into epoxy to fabricate a composite with different compositions through a hand lay-up technique to achieve enhanced mechanical, thermal, and dielectric properties. The interface morphology, dielectric constant, mechanical strength, thermal conductivity, and thermal stability of composites were investigated. A strong-fabric matrix interface in composite was observed through micrographs, revealing the stress transfer through the fabric. The composition of silica fabric: epoxy (70:30) showed a high electrical resistance >30000 Ω/m, a high dielectric constant value (ɛ<sub>r</sub>) of 4–5, and ultimate tensile strength (UTS) of 105 MPa. The thermal conductivity of epoxy was reduced from 0.35 to 0.15 W/m K after incorporating the silica fabric. This study introduces a novel method for recycling electronic waste, specifically focusing on PCBs to extract silica fabric (>95 %) through low-temperature pyrolysis (600 ⁰C) to create high-performance silica fabric-epoxy (SFR) composites. These SFR composites are suitable for several applications, including structural components and industry insulation materials such as battery boxes. This sustainable approach addresses e-waste management and enhances composite material performance, highlighting SFR epoxy composites’ versatility and research potential in various applications.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"198 ","pages":"Pages 174-186"},"PeriodicalIF":7.1,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Increased stability of CuFe2O4 oxygen carriers in biomass combustion by Mg doping

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-03-06 DOI: 10.1016/j.wasman.2025.02.046

Rafal Lysowski , Ewelina Ksepko , HoWon Ra

{"title":"Increased stability of CuFe2O4 oxygen carriers in biomass combustion by Mg doping","authors":"Rafal Lysowski , Ewelina Ksepko , HoWon Ra","doi":"10.1016/j.wasman.2025.02.046","DOIUrl":"10.1016/j.wasman.2025.02.046","url":null,"abstract":"<div><div>Biomass derived from agricultural waste is a promising source of renewable energy. When used in low-emission combustion technologies such as chemical looping combustion (CLC), it has the potential to achieve net negative CO<sub>2</sub> emissions. In CLC, the fuel is isolated from atmospheric air, resulting in flue gases that comprise mainly CO<sub>2</sub> and H<sub>2</sub>O. Since the fumes are not diluted by atmospheric N<sub>2</sub>, low-cost CO<sub>2</sub> capture is possible. The oxygen required for CLC is delivered entirely by an oxygen carrier (OC). Spinel-type OCs have a high oxygen-transport capacity, mechanical durability, and chemical stability. However, biomass ash is rich in alkali metals and SiO<sub>2</sub>, which adversely affect OCs by promoting cracking and agglomeration. Herein, the effect of Mg doping on the resistance of OCs to biomass ash is explored. Five Mg<em><sub>x</sub></em>Cu<sub>1−</sub><em><sub>x</sub></em>Fe<sub>2</sub>O<sub>3</sub> −type spinels (<em>x</em> = 0–1) are evaluated for the combustion of four types of biomass with varying ash compositions: three agricultural waste products (pine wood, kenaf, and rice husk) and one dedicated energy crop (<em>Miscanthus</em>). Among the tested OCs, Cu<sub>0.5</sub>Mg<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub> demonstrates the highest reactivity and conversion rates, with a reaction rate of 2.70 wt.%/min for kenaf and 95.9 % conversion for <em>Miscanthus</em>. Following multiple reaction cycles, undoped and low-Mg OCs (<em>x</em> ≤ 0.5) exhibit cracking and structural degradation, whereas high-Mg OCs (<em>x</em> ≥ 0.75) retain their structural integrity, confirming the benefit of Mg doping on the durability of spinel-type OCs. This study provides insight into the design of more resilient OCs for biomass combustion, which will guide future research on CLC technologies.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"199 ","pages":"Pages 1-12"},"PeriodicalIF":7.1,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143549383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stepping up to the plate: Leadership and local government waste managers opinions of household food waste interventions

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-03-06 DOI: 10.1016/j.wasman.2025.02.054

Esther Landells , Olav Muurlink , Gamithri G. Karunasena , Samuel Oakden , Anjum Naweed

{"title":"Stepping up to the plate: Leadership and local government waste managers opinions of household food waste interventions","authors":"Esther Landells , Olav Muurlink , Gamithri G. Karunasena , Samuel Oakden , Anjum Naweed","doi":"10.1016/j.wasman.2025.02.054","DOIUrl":"10.1016/j.wasman.2025.02.054","url":null,"abstract":"<div><div>Landfilling of household food waste contributes to global emissions yet remains prevalent worldwide. Achieving net-zero emissions targets necessitates the diversion of organic waste from landfills, placing considerable pressure on local authorities to provide waste diversion services. However, even where policies, funding, and capacity to implement food waste diversion appears to exist, service inconsistencies abound.</div><div>Many countries have local authority staff responsible for providing waste services and they are key contributors to determining how domestic waste is managed. Using Australia’s diverse geographic and demographic situation as an example, this study examines the decision-making processes and influence of local waste management staff through a national survey (n = 183) and online interviews (n = 45). A novel thematic network analysis approach revealed complex patterns of polarisation surrounding household food waste implementations. Key findings highlighted the interplay between staff attitudes, decision-making, and intervention strategies, emphasising systemic support as critical for transformative change.</div><div>Three overarching concerns emerged: (1) the need for sustained and supportive leadership to normalise food waste management and promote its value as a resource, (2) clearer delineation of responsibilities among stakeholders, and (3) enhanced and consistent funding for waste initiatives. Recommendations include leadership development, comprehensive policy impact assessments, and reliable financial support to strengthen local government operations.</div><div>This study underscores the importance of empowering local authorities to advance organic waste diversion and reduce emissions. Australia’s approach offers actionable strategies that may inform global efforts to address similar challenges.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"198 ","pages":"Pages 161-173"},"PeriodicalIF":7.1,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reducing the climate impact of residual waste treatment: A German case study on carbon management strategies

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-03-05 DOI: 10.1016/j.wasman.2025.02.048

Sarah Schmidt, David Laner

{"title":"Reducing the climate impact of residual waste treatment: A German case study on carbon management strategies","authors":"Sarah Schmidt, David Laner","doi":"10.1016/j.wasman.2025.02.048","DOIUrl":"10.1016/j.wasman.2025.02.048","url":null,"abstract":"<div><div>Climate neutrality goals require adapting the management of fossil carbon in waste management. This study evaluates the effectiveness of two key carbon management strategies addressing greenhouse gas (GHG) emissions from residual waste treatment, namely: pre-sorting residual waste in a material recovery facility to remove recyclable, carbon-rich materials (S_MRF) versus post-treatment of municipal solid waste incineration (MSWI) flue gas through carbon capture and storage (S_MSWI_CCS). Using residual waste management in Kassel, Germany, as a case study, GHG emissions are assessed for current and prospective scenarios, accounting for changes in waste inputs, material and energy systems, substitution choices, and uncertainties in treatment technology data. It is shown that MSWI in Kassel emits 857 kg of CO<sub>2</sub> per t of wet residual waste, with 31 % fossil CO<sub>2</sub>. Carbon management strategies can reduce direct fossil CO<sub>2</sub> emissions by 27 % (S_MRF) or 90 % (S_MSWI_CCS) and increase the net life cycle GHG savings of residual waste management by a factor of 1.6 (S_MRF) or 2.6 (S_MSWI_CCS), respectively. S_MSWI_CCS offers the highest potential to decrease the GHG footprint of residual waste management and is least sensitive to variations in waste composition, energy and material systems, and substitution choices. Discernibly higher net GHG savings of S_MRF compared to S_MSWI_CCS can only be observed if residual waste is rich in recyclables (low separate collection). Overall, this study highlights the utility of refined scenario, uncertainty and discernability analysis in accounting for local conditions and different settings as well as potential future changes to promote environmental decision support on waste management.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"198 ","pages":"Pages 137-150"},"PeriodicalIF":7.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A combined process of reverse flotation and slurry electrolysis for step-by-step recovery of copper and gold from waste printed circuit boards

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-03-05 DOI: 10.1016/j.wasman.2025.02.047

Tingting Chen , Yutong Cui , Yifan Li , Xin Ma , Wei Shu , Zhanfang Cao , Hong Zhong , Shuai Wang

{"title":"A combined process of reverse flotation and slurry electrolysis for step-by-step recovery of copper and gold from waste printed circuit boards","authors":"Tingting Chen , Yutong Cui , Yifan Li , Xin Ma , Wei Shu , Zhanfang Cao , Hong Zhong , Shuai Wang","doi":"10.1016/j.wasman.2025.02.047","DOIUrl":"10.1016/j.wasman.2025.02.047","url":null,"abstract":"<div><div>Waste printed circuit boards (WPCBs) constitute a significant component of e-waste, harboring abundant recyclable valuable metals. The ongoing increase in e-waste requires an efficient recycling method to recover valuable metals, thereby enhancing the recycling efficiency. In this study, an efficient and environmentally friendly combined process of reverse flotation and two-step slurry electrolysis was used to recover copper and gold from WPCBs. In the reverse flotation process, tannic acid was conducted using as a dispersant to enhance the separation selectivity, and the recoveries of copper and gold from WPCBs reached 94.57 % and 98.01 % respectively. A new high-efficiency alkaline slurry electrolysis system with ethylenediamine (en), NH<sub>3</sub>·H<sub>2</sub>O, (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> and Cu<sup>2+</sup> was devoted to recover copper from WPCBs. Under the optimal conditions, the leaching ratio, electrodeposition recovery and current efficiency of copper from WPCBs were 99.57 %, 97.53 %, and 65.64 %, respectively. Afterwards, for the anode residue after copper recovery, a kind of electrolyte consisting only of potassium iodide (KI) was proposed for recovering gold by slurry electrolysis. Under the optimal conditions, the leaching ratio, electrodeposition recovery and current efficiency of gold from WPCBs were 99.08 %, 89.12 % and 3.57 %, respectively. Thus, the copper and gold from WPCBs are recovered step by step via slurry electrolysis in different systems, it is expected to realize the application of slurry electrolysis in the e-waste industry.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"198 ","pages":"Pages 151-160"},"PeriodicalIF":7.1,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prediction of landfill gases concentration based on Grey Wolf Optimization – Support Vector Regression during landfill excavation process 垃圾填埋场挖掘过程中基于灰狼优化-支持向量回归的垃圾填埋场气体浓度预测

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-03-04 DOI: 10.1016/j.wasman.2025.02.040

Zhansheng Liu , Zehua Zhang , Qingwen Zhang , Linlin Zhao

{"title":"Prediction of landfill gases concentration based on Grey Wolf Optimization – Support Vector Regression during landfill excavation process","authors":"Zhansheng Liu , Zehua Zhang , Qingwen Zhang , Linlin Zhao","doi":"10.1016/j.wasman.2025.02.040","DOIUrl":"10.1016/j.wasman.2025.02.040","url":null,"abstract":"<div><div>In some areas, there is a phenomenon that the landfill is full or even over-capacity with the extension of the service period. With the aging and damage of the protective facilities, this phenomenon may have a more serious impact on the surrounding environment. It is necessary to excavate and transport the waste beyond the part to control it. This process will inevitably produce many landfill gas emissions, which will pollute the air. Therefore, it is necessary to predict and control the landfill gas. This study utilizes the Grey Wolf Optimization (GWO) algorithm to optimize Support Vector Regression (SVR). It establishes prediction models for various LFG concentrations based on previous LFG concentration data and real-time environmental monitoring data. The models are compared with traditional Support Vector Regression and Random Forest (RF) algorithms, predicting the concentrations of odor, ammonia, hydrogen sulfide, methane, and nitrogen oxides. The results indicate that GWO-SVR demonstrates more stable and accurate predictions across various LFG, with the coefficient of determination R<sup>2</sup> approximately 10% higher than that of SVR and RF, and most other error metrics significantly lower. In contrast, SVR and RF show substantial errors in predicting odor, hydrogen sulfide, and nitrogen oxides. Thus, the GWO-SVR algorithm substantially improves the performance in predicting LFG concentrations, meeting the needs of on-site management.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"198 ","pages":"Pages 128-136"},"PeriodicalIF":7.1,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0