Waste Management Bulletin最新文献

{"title":"Conversion of municipal solid waste to green energy: numerical studies","authors":"M. Nazim Uddin ,&nbsp;Md.Abdus Salam ,&nbsp;Salma Akhter ,&nbsp;Abu Yousuf ,&nbsp;Arup Kumar Biswas ,&nbsp;Badrul Amin Khan ,&nbsp;M. Rakib Uddin","doi":"10.1016/j.wmb.2025.100211","DOIUrl":"10.1016/j.wmb.2025.100211","url":null,"abstract":"<div><div>Greenhouse gas (GHG) emissions from the conventional management of municipal solid waste (MSW) are a serious environmental problem. Transformation of energy content present in MSW to combined heat and power (CHP) offers simultaneous advantages of reduction in GHG emission and pressure on finite fossil fuel reserve. Current research is devoted to developing a numerical model in Aspen Plus software to estimate the CHP generation potentiality of MSW and application to Bangladesh for the first time. CHP generation is accomplished through thermal treatment of gasification coupling with an internal combustion engine (ICE) system. Gasification model development is completed through calibration and validation. Model calibration is performed by comparing the experimental data on syngas generation from a blend of waste pulp (WP) and deinking sludge (DIS) in a pilot-scale fluidized bed reactor (FBR) whereas validation is by linking the outcomes on gasification of bamboo chips in an FBR at four different operating conditions. Sensitivity analysis identifies 850 °C and an equivalence ratio of 0.2 as the optimal conditions for air-gasification of MSW. The study estimates the CHP generation capacity of the analyzed MSW is 0.89 kWh/kg of dry solid (DS) MSW for electrical energy and 1.61 kWh/kg of DS for thermal energy. MSW in Bangladesh could generate approximately 3,300 GWh/yr of electricity and 6,000 GWh/yr of thermal energy in 2024. Electrical and thermal energy generation from MSW can reduce net annual GHG emissions of 2,510 Mt CO₂/yr compared to similar quantities of CHP generation from fossil fuels. This ensures proper MSW management, greater GHG reduction, and some relief for Bangladesh’s energy crisis.</div></div>","PeriodicalId":101276,"journal":{"name":"Waste Management Bulletin","volume":"3 3","pages":"Article 100211"},"PeriodicalIF":0.0,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploring the potential of garbage enzyme as an eco-friendly option for leachate treatment collected from Pirana dumping site, Ahmedabad, Gujarat, India","authors":"Dharni Parekh ,&nbsp;Sachin Vaidh ,&nbsp;Dhara Patel ,&nbsp;Shuvomoy Banerjee ,&nbsp;Gajendra Singh Vishwakarma","doi":"10.1016/j.wmb.2025.100210","DOIUrl":"10.1016/j.wmb.2025.100210","url":null,"abstract":"<div><div>Garbage enzyme (GE), a bio-catalytic solution produced through the fermentation of organic waste, has gained popularity as an alternate way to wastewater and leachate treatment. This study examines the ability of GE to degrade organic pollutants, and hazardous chemicals usually present in leachate. In this regard, the leachate samples were collected from the Pirana solid waste dumping site in Ahmedabad, India. The samples were having average values of different parameters like pH: 8.8 ± 0.12 mg/L, Total dissolve solids (TDS mg/L) 19000 ± 199.9 mg/L, and Electric conductivity (EC mg/L) 21800 ± 110.12, Chemical Oxygen Demand (COD mg/L) 13500 ± 2411 mg/L, and Ammoniacal nitrogen (NH₃-N mg/L): 1750 ± 15.01 mg/L. Furthermore, one of the representative samples was utilized for the exploration of the biodegradation capacity of GE of the organic pollutants present in the leachate. Before the utilization of the GE in the treatment, the GE is characterized via biochemical profiling, enzymatic activity analysis, and metagenomic profiling of microbial populations. The findings show the presence of metabolites like flavonoids, alkaloids, quinones, saponins, and cardenolides in the GE; the bacterial group <em>Acetobacter senegalensis</em> was generally considered higher in the population, and the <em>Komagataeibacter swingsii was in</em> low abundance<em>.</em> In addition to that, the presence of enzymes like lipase and amylase was also confirmed with the further biochemical analysis. The treatment efficiency showed the significant reduction in the COD (47 % for citrus fruit GE and 60 % for the non-citrus fruit GE) and NH₃-N 40 % for citrus fruit GE and 45 % for the non-citrus fruit) GE as compared to the control.</div></div>","PeriodicalId":101276,"journal":{"name":"Waste Management Bulletin","volume":"3 3","pages":"Article 100210"},"PeriodicalIF":0.0,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing salt-stress tolerance in tomato (Solanum lycopersicum): The crucial role of bio-compost and rhizospheric Luteimonas spp","authors":"Yanting Chen ,&nbsp;Jia Ding ,&nbsp;Ning Wang ,&nbsp;Xiaoyan Ding ,&nbsp;Yuquan Wei ,&nbsp;Ji Li ,&nbsp;Guo-chun Ding","doi":"10.1016/j.wmb.2025.100208","DOIUrl":"10.1016/j.wmb.2025.100208","url":null,"abstract":"<div><div>The rhizosphere microbiome, as the ‘second genome’ of plants, greatly extends the ability of plants to cope with various biotic and abiotic stresses. Organic amendments have also been demonstrated to elevate the tolerance of plants to salt-stress. However, the interlinking between rhizosphere microbiome, plant tolerance to salt-stress, and organic amendments remains unclear. Herein, two halotolerant microbial consortia (H1 and H2) expedited the composting process without affecting the quality of the resulting composts. Interestingly, both bio-composts (C-H1 and C-H2), especially C-H1, greatly improved the growth and photosynthetic ability of tomato under salt-stress by 25.63 % to 56.0 %. The levels of superoxide dismutase, peroxidase and catalase activities, and the content of malondialdehyde in tomato by C-H1 were 67.6 %, 76.9 %, 137.4 %, and 276.3 % higher, respectively, than those by the control compost (C). The 16S rRNA profiling analysis revealed that compost fertilization shifted the microbial community in the tomato rhizosphere, leading to a consistent enrichment of <em>Luteimonas</em> and a transient enrichment of <em>Conexibacter, Solirubrobacter, Lactobacillus</em>, and <em>Ureibacillus,</em> especially C-H1. <em>In vitro</em> analysis further confirmed that a <em>Luteimonas</em> bacterium which was over-represent in the rhizosphere of bio-compost-fertilized tomatoes promoted the growth of root by 29.9 % and 15.8 % at 0.4 % and 0.8 % NaCl, respectively. In conclusion, bio-compost could improve salt tolerance of tomato by stimulating the expression of salt-tolerance-related enzymes and recruiting beneficial <em>Luteimonas spp</em>.</div></div>","PeriodicalId":101276,"journal":{"name":"Waste Management Bulletin","volume":"3 3","pages":"Article 100208"},"PeriodicalIF":0.0,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143844180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Process Residues in Cement Clinker Production: A Review","authors":"Emmanuel Mache,&nbsp;Magdalena Rajczakowska,&nbsp;Andrzej Cwirzen","doi":"10.1016/j.wmb.2025.100205","DOIUrl":"10.1016/j.wmb.2025.100205","url":null,"abstract":"<div><div>Portland cement (PC) production accounts for about 8 % of global CO₂ emissions. As the demand for cement grows, sustainable alternative raw materials for cement production are essential for reducing the impacts of its production. Process residues from industrial processes like mine tailings, metallurgical slags, incinerated municipal solid wastes (MSWI), glass industry wastes, and Kraft pulp mill wastes are being studied as suitable raw materials for clinker production. These materials contain CaO, SiO₂, Al₂O₃, and Fe₂O₃, which are required for the formation of tricalcium silicate (C₃S, alite), dicalcium silicate (C₂S, belite), tricalcium aluminate (C₃A), and tetracalcium aluminoferrite (C₄AF) clinker phases. However, these raw materials may contain impurities such as alkali oxides and heavy metals, which can significantly influence the clinkering process. While alkali oxides tend to lower the eutectic temperature, heavy metals can modify phase stability and hinder the formation of essential clinker phases. This review examines whether these residues are chemically and mineralogically suitable for alternative raw materials. It examines their impact on phase transformations, reactions, environmental sustainability, hydration and performance of the resultant cement. Process residues in clinker production present challenges and opportunities, affecting hydration, workability, and setting times. However, research remains limited to the combined effects of multiple residues on clinker reaction kinetics, durability, heavy metal stabilization, and life cycle impacts.</div></div>","PeriodicalId":101276,"journal":{"name":"Waste Management Bulletin","volume":"3 3","pages":"Article 100205"},"PeriodicalIF":0.0,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A green process for lignin extraction and lignocellulose degrading enzyme production from rice straw by solid state fermentation with Streptomyces thermoviolaceous strains","authors":"Sonam Priyadarshani ,&nbsp;Preeti Nandal ,&nbsp;Anju Arora ,&nbsp;Gautam Chawla ,&nbsp;Rajesh kumar ,&nbsp;Debarup Das ,&nbsp;Archna Suman","doi":"10.1016/j.wmb.2025.100207","DOIUrl":"10.1016/j.wmb.2025.100207","url":null,"abstract":"<div><div>Actinobacteria belonging to genus <em>Streptomyces</em> are a versatile group actively involved in global C cycle with abilities to degrade several recalcitrant substrates. Inhabiting diverse ecological niches, they are active in different pH and temperature regimes thus a source of robust enzymes for exploitation in bioprocessing. Compost is one such habitat supporting huge microbial diversity, lignocellulolytic actinobacteria being predominant in community. In this study, two actinobacterial strains isolated from compost through enrichment culture, identified as <em>Streptomyces thermoviolaceous</em> S1 and S2, showed lignocellulolose degrading enzyme production. When grown on rice straw under solid state fermentation they disrupted lignocellulose matrix. Structural changes in solid substrate were observed by non-invasive techniques SEM, XRD and FTIR. Alkali extraction of fermented solids removed about ∼ 33 % lignin from rice straw while buffer extracts showed high specific activities of all three components of cellulases, xylanase (84 IU/ mL), laccase (59 IU/ mL) and lignin peroxidase (26 IU/ mL).</div><div><em>S. thermoviolaceous</em> S2 showed better enzyme activities, lignin removal and cellulose enrichment than S1 (53.03 % and 49.01 % by <em>S. thermoviolaceous</em> S2 and S1 respectively). Alkali extraction led to efficient lignin removal than buffer extraction as evident from higher absorbance of alkali extracts (@205 nm) which was corroborated by higher recovery of acid precipitable lignin. Better cellulose enrichment enabled higher glucan loading and higher sugar yields upon enzymatic saccharification than uninoculated substrate. This study outlined a green like process involving biological treatment of rice straw with <em>S. thermoviolaceous</em> strains for delignification, lignin recovery and simultaneous lignocellulose degrading enzyme production for biomass processing.</div></div>","PeriodicalId":101276,"journal":{"name":"Waste Management Bulletin","volume":"3 3","pages":"Article 100207"},"PeriodicalIF":0.0,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143828912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysing disparities between household food waste metrics and their socioeconomic drivers in Chamwino District, Tanzania","authors":"Denis M. Silayo,&nbsp;Abiud J. Bongole,&nbsp;Mary Kulwijila","doi":"10.1016/j.wmb.2025.100206","DOIUrl":"10.1016/j.wmb.2025.100206","url":null,"abstract":"<div><div>Food waste measurement has garnered significant attention in recent years due to its critical role in devising interventions to mitigate the environmental, social, and economic impacts of food waste. However, the absence of a standardized protocol for Food Waste (FdW) quantification remains a key obstacle in formulating and evaluating effective minimization strategies. This study utilizes Bland-Altman plots and regression analysis to evaluate the agreement between Self-Reported Food Waste (SR_FW) and Direct Weighing Food Waste (DW_FW) in a sample of 402 randomly selected households in Chamwino District, Tanzania. It also investigates the socioeconomic factors influencing disparities between these measurement methods, providing valuable insights into the drivers of these discrepancies. The findings reveal a bias of 0.100067 Kilogram (kg), indicating that SR_FW measurements significantly underestimate household FdW. On average, respondents report edible FdW of 0.032703 kg through SR_FW, while DW_FW measures 0.132769 kg. Furthermore, gender, age, marital status, house ownership, awareness, and price and cost sensitivity are identified as significant factors influencing the bias between the two methods. The study concludes by advocating for increased awareness creation, the combined use of SR_FW and DW_FW methods, and measures to foster household accountability. These recommendations aim to enhance the accuracy of FdW quantification and support the development of effective waste reduction strategies.</div></div>","PeriodicalId":101276,"journal":{"name":"Waste Management Bulletin","volume":"3 3","pages":"Article 100206"},"PeriodicalIF":0.0,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comprehensive review on exposure to toxins and health risks from plastic waste: Challenges, mitigation measures, and policy interventions","authors":"Salia S. Sheriff ,&nbsp;Abdulfatah Abdu Yusuf ,&nbsp;Oluwole O. Akiyode ,&nbsp;Ezekiel Fayiah Hallie ,&nbsp;Saidi Odoma ,&nbsp;Rebecca Alicia Yambasu ,&nbsp;Kula Thompson-Williams ,&nbsp;Charles Asumana ,&nbsp;Sylvester Z. Gono ,&nbsp;Mohammed A. Kamara","doi":"10.1016/j.wmb.2025.100204","DOIUrl":"10.1016/j.wmb.2025.100204","url":null,"abstract":"<div><div>The rapid accumulation of plastic waste in the environment poses a significant global challenge, exacerbating ecosystem pollution and public health risks. Annually, approximately 8 million tons of plastic waste enter the oceans, contributing to ecosystem degradation and human exposure to toxic substances. Toxins such as phthalates, bisphenol A (BPA), dioxins, furans, and heavy metal residues released from plastic degradation cause severe health risks, including endocrine disruption, carcinogenesis, and respiratory diseases. This study reviews exposure pathways and bioaccumulation mechanisms of plastic-derived toxins, their health risks, mitigation strategies, and policy interventions. The findings reveal that BPA concentrations in rivers can exceed 12 µg/L, and dioxins in soil surpass 1000 ng Toxic Equivalency Quotient (TEQ)/kg in areas with open burning, exceeding WHO thresholds. In Poland, landfill leachate shows phthalate levels over 303 µg/L, while heavy metals in fish tissue reached over 2.26 ng/g wet weight in Sweden. Vulnerable populations in low- and middle-income countries (LMICs), particularly in Sub-Saharan Africa, face heightened risk exposure, with 39–45 % of urban waste being formally managed. Despite recycling efforts, only 9 % of plastic waste is recycled globally, while open burning and inadequate incineration release hazardous pollutants like dioxins and furans. Advanced solutions, such as chemical recycling, with recovery rates up to 97 % for polyethylene terephthalate (PET), and enzymatic degradation, achieving 90 % plastic breakdown in 10 h, show promise but face scalability challenges. Case studies from Germany, Japan, and Rwanda demonstrate effective strategies, including extended producer responsibility schemes and bans on single-use plastics, achieving recycling rates exceeding 41 % and reducing waste by 90 %. However, challenges persist, particularly in low- and middle-income countries with inadequate waste management infrastructure. This study concludes by recommending stricter regulations, investment in advanced recycling technologies, development of bioplastics, and international collaborations to mitigate health risks and environmental contamination from plastic waste.</div></div>","PeriodicalId":101276,"journal":{"name":"Waste Management Bulletin","volume":"3 3","pages":"Article 100204"},"PeriodicalIF":0.0,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation and characterization of biochar and briquettes from agricultural wastes for sustainable energy production","authors":"Olufunke O. Oyebamiji ,&nbsp;Akin S. Olaleru ,&nbsp;Raifu B. Oyeleke ,&nbsp;Lauretta N. Ofodile","doi":"10.1016/j.wmb.2025.100198","DOIUrl":"10.1016/j.wmb.2025.100198","url":null,"abstract":"<div><div>Utilizing agricultural waste presents a promising solution for sustainable energy production and efficient waste management. This study focuses on producing and characterizing biochar and briquettes derived from the pyrolysis of seven abundant agricultural residues: Corn Cob, Groundnut shell, Rice Bran, Sawdust, Corn Straw, Dry Leaf, and Sugar Cane peel. The process involves subjecting the raw materials to controlled pyrolysis conditions and compaction into briquettes. FTIR analysis of biochar and raw dried samples, physicochemical analysis, and percentage yield on biochar, and calorific value on the briquettes produced were conducted to characterize the agricultural wastes. The physicochemical parameters of their biochar revealed significant differences in their composition. The pH ranged from 8.76 (Dry leaves) to 14.09 (Corn cob), Cation Exchange Capacity ranged from 1.55 − 7.39 cmol (+)/Kg, moisture content ranged from 2.74 − 6.36 %, volatile matter ranged from 1.85 – 6.87 %, ash content ranged from 16.70 – 79.25 %, and fixed carbon ranged from 11.30 – 72.07 %. The percentage yield of biochar from raw materials ranged from 8.6 % (sugarcane) to 27 % (groundnut shell), while the calorific value of the briquettes produced ranged from 1,868.57 KJ/g (sugarcane) to 55,511.2 KJ/g (Rice bran). The FTIR analysis revealed distinct spectral peaks for all charred waste compared to their raw counterparts, indicating structural changes during pyrolysis. These findings show the potential of some agricultural waste-derived briquettes as an efficient, sustainable, and renewable alternative fuel source. The characterization tests demonstrate their viability as a practical energy source, offering agricultural waste management solutions.</div></div>","PeriodicalId":101276,"journal":{"name":"Waste Management Bulletin","volume":"3 3","pages":"Article 100198"},"PeriodicalIF":0.0,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143821285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Linking solid waste and onsite sanitation: Quantification, stakeholder perspectives, and practices in two divisions of Kampala, Uganda","authors":"C. Furlong ,&nbsp;E. Akol ,&nbsp;N.L. Bateganya ,&nbsp;C.M. Hooijmans","doi":"10.1016/j.wmb.2025.100203","DOIUrl":"10.1016/j.wmb.2025.100203","url":null,"abstract":"<div><div>Understanding the connection between solid waste and sanitation is crucial for improving both systems. This exploratory case study is the first to examine the type and amount of solid waste in onsite sanitation systems, the reasons behind these practices, their impact, and potential prevention methods, across various stakeholders. The study was conducted in two municipal divisions of Kampala, Uganda (Kawempe and Makindye). Solid waste from 19 shared sanitation systems was collected, dried, classified, and quantified during emptying. Interviews were conducted with 20 emptiers, 40 users (20 male, 20 female), and 16 key informants (all male). Most solid waste found in pit latrines and septic tanks was classified as “taboo” waste—items hidden due to social, cultural, or religious reasons. The reasons given for disposing of solid waste in these systems supports previous hypotheses which had remained unexplored. This study generated new hypotheses, particularly emphasizing the role of “taboo” waste, due to its comprehensive methodology. Findings highlight the need for sanitation and waste management sectors to address “taboo” waste specifically rather than general solid waste. Additionally, no stakeholders had considered the complex relationship between these systems, yet an integrated approach is essential for sustainable solutions. These novel insights are critical for solid waste and sanitation specialists worldwide, emphasizing the importance of addressing hidden waste disposal behaviours to improve system efficiency and sustainability.</div></div>","PeriodicalId":101276,"journal":{"name":"Waste Management Bulletin","volume":"3 3","pages":"Article 100203"},"PeriodicalIF":0.0,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pilot-scale anaerobic digestion of on-farm agro-residues: Boosting biogas production and digestate quality with thermophilic post-digestion","authors":"Shruti Katti ,&nbsp;Bernard Willems ,&nbsp;Erik Meers ,&nbsp;Çağrı Akyol","doi":"10.1016/j.wmb.2025.100201","DOIUrl":"10.1016/j.wmb.2025.100201","url":null,"abstract":"<div><div>Environmental challenges associated with the disposal of organic farm waste and the growing demand for renewable energy underscore the importance of anaerobic digestion (AD), a process that converts organic matter into biogas and nutrient-rich digestate, offering a sustainable solution for waste management and energy production. This study evaluated a two-step AD process using cow manure and yeast extract through mono- and co-digestion trials at pilot-scale, serving as a preliminary step to assess feasibility and performance prior to scaling up for full-scale implementation on a dairy farm. Two 72 L continuously stirred tank reactors were operated, with the primary reactor maintained at mesophilic conditions and the secondary reactor acting as a thermophilic post-digester. This configuration was used to assess the influence of thermophilic post-digestion on biogas yield and digestate quality. During the mono-digestion of manure, mesophilic digestion yielded 138 L CH₄/kg VS, while thermophilic post-digestion provided an additional methane recovery of 100 L CH₄/kg VS. Co-digestion with yeast extract significantly enhanced methane yield, increasing it 1.77-fold to 421 L CH₄/kg VS in the two-stage AD system. However, co-digestion resulted in elevated hydrogen sulphide (H₂S) levels, posing potential challenges for biogas purification. Additionally, higher and more fluctuating volatile fatty acid concentrations were observed compared to manure mono-digestion. The quality and safety of the digestates remained comparable between mono- and co-digestion treatments, suggesting that co-digestion with yeast extract can offer advantages for manure-based AD systems, although an effective H₂S mitigation strategy is recommended to optimise process sustainability.</div></div>","PeriodicalId":101276,"journal":{"name":"Waste Management Bulletin","volume":"3 3","pages":"Article 100201"},"PeriodicalIF":0.0,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}