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Landfill gas loading ramp-up strategies: Acclimatization optimization and long-term oxidation capacity of methane oxidation biosystems 垃圾填埋气体负荷提升策略:甲烷氧化生物系统的适应性优化和长期氧化能力
IF 7.1 2区 环境科学与生态学
Waste management Pub Date : 2026-02-28 Epub Date: 2026-01-31 DOI: 10.1016/j.wasman.2026.115372
Jessica Leindorf de Almeida, Jacopo De Tommaso, Federico Galli, Alexandre Cabral
{"title":"Landfill gas loading ramp-up strategies: Acclimatization optimization and long-term oxidation capacity of methane oxidation biosystems","authors":"Jessica Leindorf de Almeida,&nbsp;Jacopo De Tommaso,&nbsp;Federico Galli,&nbsp;Alexandre Cabral","doi":"10.1016/j.wasman.2026.115372","DOIUrl":"10.1016/j.wasman.2026.115372","url":null,"abstract":"<div><div>Methane (CH<sub>4</sub>) emissions from landfills represent a challenge in global climate mitigation efforts. Methane oxidation biosystems (MOB) offer a low-cost solution for addressing residual and fugitive CH<sub>4</sub> emissions, yet the role of the acclimatization phase has not received enough attention in the technical literature. Here we optimize the acclimatization of compost-based MOBs through controlled landfill gas (LFG) ramp-up strategies. Four identical laboratory-scale columns were subjected to distinct flow increase patterns: exponential, linear, first-order-like, and constant inlet loading. The results showed that exponential and linear strategies accelerated the attainment of 100% CH<sub>4</sub> removal faster than the constant-flow system. Additionally, the axial gas concentration profile revealed that ramp-up strategies influenced the depth required for complete oxidation. Notably, exponential ramp-up led to full CH<sub>4</sub> removal within the first 50 mm of the methane oxidation layer (MOL) when actively aerated, suggesting the potential to significantly reduce its thickness in field systems. An additional 175-day column test, designed to estimate the maximum methane oxidation capacity under increasing loadings, confirmed the benefits of gradual acclimatization. By assuming that the oxidation rate follows the Michaelis–Menten model, the system achieved sustained removal efficiencies (&gt;90%) and reached a maximum oxidation rate (<span><math><mrow><msub><mi>V</mi><mrow><mi>max</mi></mrow></msub></mrow></math></span>) of 3811 g<sub>CH4</sub>·m<sup>−3</sup>·d<sup>-1</sup> and a <span><math><mrow><msub><mi>K</mi><mi>m</mi></msub></mrow></math></span> of 12 g<sub>CH4</sub>·m<sup>−3</sup>. These findings highlight the importance of ramp-up strategies in designing efficient and more compact MOBs that can quickly attain design loadings.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"213 ","pages":"Article 115372"},"PeriodicalIF":7.1,"publicationDate":"2026-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080098","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
Extended exergy accounting applied to waste-to-energy facilities location-allocation problem 扩展火用会计在垃圾焚烧发电设施选址分配问题中的应用。
IF 7.1 2区 环境科学与生态学
Waste management Pub Date : 2026-02-28 Epub Date: 2026-02-04 DOI: 10.1016/j.wasman.2026.115388
Yong Liu , Zi-hong Huang , Yuan-fang Zhang , Qiong-jie Zheng
{"title":"Extended exergy accounting applied to waste-to-energy facilities location-allocation problem","authors":"Yong Liu ,&nbsp;Zi-hong Huang ,&nbsp;Yuan-fang Zhang ,&nbsp;Qiong-jie Zheng","doi":"10.1016/j.wasman.2026.115388","DOIUrl":"10.1016/j.wasman.2026.115388","url":null,"abstract":"<div><div>With the unexpected increase in municipal solid waste (MSW), the existing waste-to-energy (WTE) facilities have been overloaded, which has posed a severe threat to urban environmental safety. The location of WTE facilities directly determines the economic costs and is essential to sustainable urban development. However, most of the current WTE facility location models are constructed based on optimization frameworks. These frameworks mainly consider economic costs, transportation distances, emissions and capacity limitations, often ignoring the comprehensive integration of thermodynamic efficiency and social environmental factors. Herein, we propose a novel Mixed-Integer Linear Programming (MILP) model integrating Extended Exergy Accounting (EEA) to optimize WTE facility locations by evaluating thermodynamic, economic, social, and environmental impacts. The case study on the site allocation for solid waste incineration plants in Shenzhen City shows that, compared with the current situation and the site allocation plan proposed by the government, the model proposed in this paper generates less external environmental and social costs exergy when handling the same amount of household waste, and can recover more valuable products. It generates 31.06% and 24.12% more additional value products respectively. Our research results indicate that strategic facility layout can reduce transportation energy consumption and dependence on landfill, providing an expandable solution for sustainable municipal solid waste management.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"213 ","pages":"Article 115388"},"PeriodicalIF":7.1,"publicationDate":"2026-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146126714","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
A comprehensive overview of the potential of recycled carbon fiber from composite waste: reclamation, remanufacturing, and performance 从复合材料废物中回收碳纤维的潜力的全面概述:回收,再制造和性能
IF 7.1 2区 环境科学与生态学
Waste management Pub Date : 2026-02-28 Epub Date: 2026-01-29 DOI: 10.1016/j.wasman.2026.115352
Peter Sántha , Peter Tamás-Bényei
{"title":"A comprehensive overview of the potential of recycled carbon fiber from composite waste: reclamation, remanufacturing, and performance","authors":"Peter Sántha ,&nbsp;Peter Tamás-Bényei","doi":"10.1016/j.wasman.2026.115352","DOIUrl":"10.1016/j.wasman.2026.115352","url":null,"abstract":"<div><div>The widespread adoption of carbon fiber–reinforced polymers (CFRPs) across high-performance sectors such as aerospace, automotive, wind energy, and construction has significantly increased the global demand for carbon fibers (CFs). However, the energy-intensive production process and growing volume of end-of-life (EoL) CFRP waste present significant environmental and economic challenges. This review offers a comprehensive analysis of the state of the art in carbon fiber recycling, focusing on the reclamation, remanufacturing, and reuse of recycled carbon fibers (rCFs) to support a sustainable circular economy. These waste streams are projected to grow substantially, driven by the decommissioning of wind turbines and aircraft. The valuable fibers are lost in traditional waste management practices, such as landfilling and incineration. Landfilling is also detrimental to the environment and unsustainable. Hence, recovering CFs through recycling is essential for minimizing environmental impacts and preserving material value.</div><div>This review presents a comprehensive assessment of recycling technologies, including mechanical, thermal, chemical, and emerging methods. Each technique is assessed based on quantified fiber retention, energy efficiency, scalability, and technological readiness. The study further explores remanufacturing technologies for rCFs, detailing their transformation into intermediate forms suitable for reuse. The alignment of discontinuous fibers is critical for maximizing mechanical performance. Analytical and numerical modeling tools applied to predict fiber orientation, alignment efficiency, and composite behavior are included. In addition to technical insights, the article integrates economic viability, quality assurance, and life cycle assessment (LCA) to evaluate environmental performance, supporting market acceptance and regulatory compliance by quantifying the sustainability advantages of rCFs.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"213 ","pages":"Article 115352"},"PeriodicalIF":7.1,"publicationDate":"2026-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080678","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
Numerical study of in‑situ aeration using landfillFoam: effects of landfill properties and aeration strategies 利用垃圾填埋泡沫进行原位曝气的数值研究:垃圾填埋场特性和曝气策略的影响
IF 7.1 2区 环境科学与生态学
Waste management Pub Date : 2026-02-28 Epub Date: 2026-01-28 DOI: 10.1016/j.wasman.2025.115306
Junlong Huang , Yiping Wu , Fangming Xu , Hongtao Wang , Yanjun Liu
{"title":"Numerical study of in‑situ aeration using landfillFoam: effects of landfill properties and aeration strategies","authors":"Junlong Huang ,&nbsp;Yiping Wu ,&nbsp;Fangming Xu ,&nbsp;Hongtao Wang ,&nbsp;Yanjun Liu","doi":"10.1016/j.wasman.2025.115306","DOIUrl":"10.1016/j.wasman.2025.115306","url":null,"abstract":"<div><div>In-situ aeration, achieved by injecting air into municipal solid waste, accelerates landfill stabilization, yet current designs remain largely empirical. This study introduces <em>landfillFoam</em>, an open-source solver built on OpenFOAM and porousMultiphaseFoam, integrating unsaturated two-phase flow, the dusty gas model for multicomponent transport, Monod-type aerobic and anaerobic degradation, methane oxidation, and heat transfer. Validation against analytical solutions and field data confirmed its accuracy. A 1,200-day baseline simulation identified four aerobic stabilization stages, with aerobic processes contributing 36% of total organic degradation. Aeration shortened stabilization time by 10-15% relative to non-aerated conditions. Parametric analyses showed that higher permeability enhanced injection rates but increased overheating risk, while water saturation of 40-60% provided an optimal balance between degradation and oxygen transport. A hexagonal well layout improved energy efficiency by 40% compared with a square layout, and reducing spacing from 15 m to 12 m yielded marginal benefits. In contrast, alternating injection-extraction wells and intermittent injection hindered stabilization relative to continuous injection. Early aeration initiation markedly enhanced stabilization, with a critical delay threshold beyond which benefits diminished. These findings provide quantitative guidance for optimizing aeration strategies to reduce landfill aftercare requirements.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"213 ","pages":"Article 115306"},"PeriodicalIF":7.1,"publicationDate":"2026-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080679","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
Post-consumer paper cups to hydrogen and functional catalytic material 消费后纸杯以氢和功能催化材料为主
IF 7.1 2区 环境科学与生态学
Waste management Pub Date : 2026-02-28 Epub Date: 2026-01-29 DOI: 10.1016/j.wasman.2026.115364
Vigneshwar N. Gnanasekaran , Ayush Dave , Sivamohan N. Reddy
{"title":"Post-consumer paper cups to hydrogen and functional catalytic material","authors":"Vigneshwar N. Gnanasekaran ,&nbsp;Ayush Dave ,&nbsp;Sivamohan N. Reddy","doi":"10.1016/j.wasman.2026.115364","DOIUrl":"10.1016/j.wasman.2026.115364","url":null,"abstract":"<div><div>A novel catalytic hydrothermal technique for the conversion of post-consumer paper cups (PCPC) containing polyethylene (PE) linings into hydrogen-rich fuel gas and synthesizing value-added nickel-decorated carbon composites (NDCC). The impact of operating gasification parameters such as temperature, residence time, and nickel concentration on the degradation of PCPC was investigated. A maximum H<sub>2</sub> yield (9.71 ± 0.19 mmol/g), total gas yield (TGY) (23.79 ± 0.47 mmol/g), carbon gasification efficiency (CGE) of 38.27%, and lower heating value (LHV) of 2994 KJ/Nm<sup>3</sup> was attained at 600 °C, 40 min, and a Ni concentration of 0.3 wt%. The incorporation of nickel enhances the degradation of PCPC by catalyzing the water–gas shift and cracking reactions. Compared with deionized water, the in-situ doping of nickel elevates the H<sub>2</sub> yield by 1.8 times, and TGY, CGE, and LHV by ∼ 1.7 times. The NDCC obtained at 600 °C has a cubical structure with an average particle size of 40 nm, as examined by FESEM and TEM analysis. Additionally, the synthesized NDCC was employed as an external catalyst for the degradation of glucose to hydrogen-rich fuel gas. It retained catalytic activity for up to 7 consecutive cycles, producing a maximum H<sub>2</sub> yield of 20.34 mmol/g of glucose.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"213 ","pages":"Article 115364"},"PeriodicalIF":7.1,"publicationDate":"2026-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080097","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
A GIS-based thermal mapping and forecasting approach to decarbonize residential heating systems based on metals: A city-level case study 基于gis的基于金属的住宅供暖系统脱碳的热制图和预测方法:城市层面的案例研究。
IF 7.1 2区 环境科学与生态学
Waste management Pub Date : 2026-02-28 Epub Date: 2026-02-01 DOI: 10.1016/j.wasman.2026.115382
Daniel Maestre-Cambronel, James Cotton, Keena Trowell
{"title":"A GIS-based thermal mapping and forecasting approach to decarbonize residential heating systems based on metals: A city-level case study","authors":"Daniel Maestre-Cambronel,&nbsp;James Cotton,&nbsp;Keena Trowell","doi":"10.1016/j.wasman.2026.115382","DOIUrl":"10.1016/j.wasman.2026.115382","url":null,"abstract":"<div><div>Decarbonizing residential heating requires the widespread implementation of cleaner energy infrastructures. The absence of reliable technologies to phase out natural gas from this sector remains as a key barrier in arresting residential emissions. A methodology to quantify community resources with energetic value to meet residential heating demands is developed. The enabling technology is a seasonal energy storage model that relies on community scrap metals to produce hydrogen and heat on demand via metal-water reactions. A comprehensive geospatial quantification of suitable metal stocks at the city level is derived from municipal solid waste data. The model integrates open-source data and machine learning algorithms for waste generation forecasting. Results indicate that Hamilton, Ontario, can produce between 10 and 14.6 GWh of clean heat per year between 2021 and 2050. This represents an overall reduction of 2.9 ktonnes of space heating CO<sub>2</sub> emissions every year. An optimized machine learning model based on a gradient boosting algorithm captured 86% of the variability in the municipal waste data with a root mean square error of 11.8 kg/person. The methodology presents reproducible steps to replicate the analysis in different contexts to facilitate community energy planning.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"213 ","pages":"Article 115382"},"PeriodicalIF":7.1,"publicationDate":"2026-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146107730","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
Use of compost extract as acclimatization accelerator for methane oxidation biosystems 堆肥提取物作为甲烷氧化生物系统驯化促进剂的应用
IF 7.1 2区 环境科学与生态学
Waste management Pub Date : 2026-02-28 Epub Date: 2026-01-23 DOI: 10.1016/j.wasman.2026.115359
Jeovana Jisla das Neves Santos , Fatima Osorio Baron , Alexandre R. Cabral , Federico Galli
{"title":"Use of compost extract as acclimatization accelerator for methane oxidation biosystems","authors":"Jeovana Jisla das Neves Santos ,&nbsp;Fatima Osorio Baron ,&nbsp;Alexandre R. Cabral ,&nbsp;Federico Galli","doi":"10.1016/j.wasman.2026.115359","DOIUrl":"10.1016/j.wasman.2026.115359","url":null,"abstract":"<div><div>The acclimatization process of methane oxidation biosystems typically requires several days or even months for the establishment of efficient and stable microbial communities. Here we assessed whether inoculating methane oxidation media with compost extract from pre-acclimatized compost-based materials accelerated acclimatization and increased methane oxidation capacity. Batch assays using biosolids and leaf compost were tested by the addition of compost extract in different dilutions of 100%, 66.6% (33.3% water), and 33.3% (66.6% water) at two initial CH<sub>4</sub> concentrations (10% and 5% v/v). The most promising dilution (33.3%) was then assessed in continuous-flow column experiments with a structured engineered media (biosolids compost–gravel mixture (1:2 v/v). Results from batch assays showed that for the biosolids compost, the addition of compost extract reduced acclimatization time by 54–82% and increased oxidation rates from 16 to 70 µg CH<sub>4</sub>·gdw<sup>−1</sup>·h<sup>−1</sup>. The test with leaf compost showed a slightly smaller gain in acclimatization time (50–66%) and increase in oxidation rates from 11 to 32 µg CH<sub>4</sub>·gdw<sup>−1</sup>·h<sup>−1</sup>. In column tests, inoculation enabled full CH<sub>4</sub> removal within 3 days, whereas in the test without inoculation, the sample was not yet fully acclimatized after 18 days. Microbiological analysis indicated that the compost extract preserved a diverse methanotrophic community. These findings demonstrate that compost extract inoculation is a simple, low-cost, and effective approach to accelerate start-up and enhance early-stage CH<sub>4</sub> removal in methane oxidation biosystems. Implementing this strategy at full scale will likely shorten the stabilization period needed for methane oxidation biosystems to attain their full methane mitigation capacity.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"213 ","pages":"Article 115359"},"PeriodicalIF":7.1,"publicationDate":"2026-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039528","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
Linking landfill operational characteristics and treatment conditions to Daphnia magna toxicity of leachates 垃圾填埋场操作特点及处理条件与大水蚤毒性的关系
IF 7.1 2区 环境科学与生态学
Waste management Pub Date : 2026-02-28 Epub Date: 2026-01-27 DOI: 10.1016/j.wasman.2026.115368
Tomas Makaras, Brigita Gylytė, Janina Pažusienė, Roberta Valskienė
{"title":"Linking landfill operational characteristics and treatment conditions to Daphnia magna toxicity of leachates","authors":"Tomas Makaras,&nbsp;Brigita Gylytė,&nbsp;Janina Pažusienė,&nbsp;Roberta Valskienė","doi":"10.1016/j.wasman.2026.115368","DOIUrl":"10.1016/j.wasman.2026.115368","url":null,"abstract":"<div><div>Leachate toxicity is influenced by multiple landfill factors, yet the drivers and the biological levels at which effects manifest remain poorly understood. We conducted a multi-level biological assessment of <em>Daphnia magna</em> exposed to leachates from non-hazardous/industrial landfills differing in operational status (operational vs. non-operational), environmental exposure (precipitation-protected vs. unprotected), and treatment stage (untreated, partially, or fully treated). Acute effective (EC<sub>50</sub>) and low-effect equivalent (EC<sub>5</sub>, 1/4, and 1/16 EC<sub>5</sub>) concentrations were evaluated to compare treatments and relate response magnitude to leachate physicochemical characteristics and landfill-specific factors. This approach enabled biologically equivalent comparisons across sites and spanned four interconnected levels—physiological, behavioural, growth, and reproductive—providing insights beyond standard endpoints. Even treated leachates retained toxicity at the lowest concentrations tested. Specific physicochemical parameters driving leachate toxicity were identified, guiding testing and risk assessment. Based on toxicity unit (TU) values, the highest toxicity was observed in precipitation-protected leachate (108.36), followed by precipitation-unprotected leachates (19.69–60.24), non-operational leachate (6.70), and partially treated leachate after mechanical/biological treatment (4.84). No toxic effects on <em>D. magna</em> immobilization were detected in fully treated leachate following reverse osmosis. Sublethal exposures affected heart rate, behaviour, and growth, with reproduction largely unaffected; heart rate was the most sensitive endpoint, responding even at 1/16 EC<sub>5</sub>, including in post-treated leachates. These results show that landfill age, composition, management, and post-treatment collectively shape leachate toxicity, influencing both magnitude and type of biological response. Further studies should explore interactions with environmental factors and identify suitable test organisms and endpoints for rapid, sensitive assessment.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"213 ","pages":"Article 115368"},"PeriodicalIF":7.1,"publicationDate":"2026-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080677","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
Nutrient recovery from Co-Hydrothermal carbonization of animal manures: Synergistic effects on hydrochar properties and agronomic potential 动物粪便共热炭化的养分回收:对碳氢化合物性质和农艺潜力的协同效应
IF 7.1 2区 环境科学与生态学
Waste management Pub Date : 2026-02-28 Epub Date: 2026-01-31 DOI: 10.1016/j.wasman.2026.115391
Bilash Devnath , Sami Khanal , Ajay Shah , Toufiq Reza
{"title":"Nutrient recovery from Co-Hydrothermal carbonization of animal manures: Synergistic effects on hydrochar properties and agronomic potential","authors":"Bilash Devnath ,&nbsp;Sami Khanal ,&nbsp;Ajay Shah ,&nbsp;Toufiq Reza","doi":"10.1016/j.wasman.2026.115391","DOIUrl":"10.1016/j.wasman.2026.115391","url":null,"abstract":"<div><div>This study evaluates the effects of co-hydrothermal carbonization (Co-HTC) of poultry (PM), dairy (DM), and swine manure (SM) at 180, 220, and 260 °C on hydrochar yield, nutrient recovery, phytotoxicity, and heavy metal retention. Co-HTC of PM with DM (PMDM) and PM with SM (PMSM) were assessed for synergistic effects by comparing observed values to predicted additive outcomes based on individual HTC data. Hydrochar yield decreased with increasing temperature across all treatments; however, PMSM and PMDM exhibited synergistic enhancement in yield at 180 °C (synergistic coefficient: 1.13–1.23). Elemental analysis indicated that nitrogen retention was maximized in PMDM hydrochars (4.71 ± 0.61% N at 180 °C), while PMSM hydrochars exhibited superior retention of phosphorus, magnesium, and calcium. Most potassium leached into the co-HTC process liquid. Heavy metals (Zn, Cu, and Ni) were effectively immobilized, with Co-HTC resulting in lower concentrations of Mo, Pb, and Cr compared to individual HTC. Seed germination index (GI), used to assess phytotoxicity, revealed temperature- and feedstock dependent trends, with PMSM hydrochar produced at 180 °C achieving the highest GI (140.91 ± 7.05%), indicating synergistic reduction in phytotoxicity. These findings demonstrate that Co-HTC can optimize recovery of nutrients into hydrochar and enhance the agronomic and environmental quality of hydrochars through tailored feedstock interactions and process tuning.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"213 ","pages":"Article 115391"},"PeriodicalIF":7.1,"publicationDate":"2026-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080094","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
Ecological reorganization of fungal communities driven by floc-size stratification and process upgrading in a full-scale landfill leachate treatment plant 在一个大型垃圾渗滤液处理厂中,由絮凝粒径分层和工艺升级驱动的真菌群落生态重组
IF 7.1 2区 环境科学与生态学
Waste management Pub Date : 2026-02-28 Epub Date: 2026-01-22 DOI: 10.1016/j.wasman.2026.115357
Shitong Liu , Shuang Zhu , Rongxin Zhang , Binbin Sheng
{"title":"Ecological reorganization of fungal communities driven by floc-size stratification and process upgrading in a full-scale landfill leachate treatment plant","authors":"Shitong Liu ,&nbsp;Shuang Zhu ,&nbsp;Rongxin Zhang ,&nbsp;Binbin Sheng","doi":"10.1016/j.wasman.2026.115357","DOIUrl":"10.1016/j.wasman.2026.115357","url":null,"abstract":"<div><div>Floc size in activated sludge systems plays a critical role in shaping bacterial communities by regulating microenvironmental heterogeneity, yet its ecological influence on fungal assemblages during process upgrading remains largely unexplored. This study aimed to systematically investigate the effects of floc-size stratification on fungal community composition, assembly mechanisms, source contribution patterns, and molecular ecological co-occurrence network structures during the transition from conventional nitrification–denitrification (CND) to partial nitrification–denitrification (PND) in a full-scale landfill leachate treatment plant. Fungal communities from large (L, &gt;100 μm), medium (M, 25–100 μm), and small (S, &lt;25 μm) flocs were characterized across three operational stages (CND, Trans, and PND) using high-throughput ITS sequencing. Analytical approaches including neutral community model, normalized stochasticity ratio, fast expectation–maximization for microbial source tracking, and molecular ecological network modeling were applied. Results showed that S-flocs consistently contributed the largest proportion to the supernatant fungal community across all stages. Community assembly transitioned from predominantly stochastic in the CND stage to increasingly deterministic in the PND stage, especially within L and M flocs. Co-occurrence network analysis revealed a shift from small-world to scale-free modular topologies, indicating substantial remodeling of fungal co-occurrence correlations. Dissolved oxygen, representing an operational factor, and sludge physicochemical indicators jointly influenced fungal community differentiation across floc-size gradients. This study highlights the regulatory role of floc-size stratification in shaping fungal ecology and network architecture during engineered nitrogen removal process upgrading. These findings provide new insights into spatial microbial dynamics and inform floc-scale strategies for optimizing biological wastewater treatment performance.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"213 ","pages":"Article 115357"},"PeriodicalIF":7.1,"publicationDate":"2026-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146006522","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
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