Waste management最新文献_第8页

A comprehensive review of sustainable valorisation of lignocellulosic biomass and plastic waste into biofuels and chemicals via co-liquefaction 木质纤维素生物质和塑料废物通过共液化转化为生物燃料和化学品的可持续增值的全面审查

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-04-26 DOI: 10.1016/j.wasman.2025.114827

Rasangika Thathsaranee Weligama Thuppahige , Leonie Barner , Mahboobeh Shahbazi , Gabriel Fraga , Lalehvash Moghaddam

{"title":"A comprehensive review of sustainable valorisation of lignocellulosic biomass and plastic waste into biofuels and chemicals via co-liquefaction","authors":"Rasangika Thathsaranee Weligama Thuppahige , Leonie Barner , Mahboobeh Shahbazi , Gabriel Fraga , Lalehvash Moghaddam","doi":"10.1016/j.wasman.2025.114827","DOIUrl":"10.1016/j.wasman.2025.114827","url":null,"abstract":"<div><div>Liquefaction stands out as a promising strategy within the bioeconomy, offering a pathway to convert waste into valuable fuels and products. However, bio-oil from biomass liquefaction has high oxygen content and poor calorific value, limiting its practical applications. To overcome these challenges, one promising approach is the co-liquefaction of oxygen-rich biomass with hydrogen-rich plastic, offering a sustainable means of producing high-quality oil. This review explores lignocellulosic biomass and plastic co-liquefaction, highlighting its behaviours, reaction pathways, and process parameters’ effects. The co-liquefaction process offers significant advantages over lignocellulosic biomass or plastic liquefaction in improving oil quality and yield. Comprehensive studies on the effect of process parameters and reaction pathways are much needed to optimise the conditions and design an efficient and effective co-liquefaction process for lignocellulosic biomass and plastics. Life cycle assessment (LCA) and techno-economic assessment (TEA) are two viable approaches to evaluating the potential environmental impacts and economic performance, respectively. Finally, lignocellulosic biomass and plastic waste co-liquefaction is a viable approach to managing waste and producing valuable materials, which promotes significant values, including resource efficiency, waste reduction, environmental sustainability, and economic opportunities.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"202 ","pages":"Article 114827"},"PeriodicalIF":7.1,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143873542","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

Effects of different types of municipal solid waste incineration slag on landfill stabilization and related microbiological mechanism 不同类型城市生活垃圾焚烧渣对垃圾填埋场稳定化的影响及其微生物机制

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-04-26 DOI: 10.1016/j.wasman.2025.114833

Ya-nan Wang, Yahui Li, Wenyu Yang, Wenyu Wang, Huawei Wang, Yingjie Sun, Jingliang Xie, Yifan Zheng, Xiongbo Cui, Weihua Li, Rongxing Bian

{"title":"Effects of different types of municipal solid waste incineration slag on landfill stabilization and related microbiological mechanism","authors":"Ya-nan Wang, Yahui Li, Wenyu Yang, Wenyu Wang, Huawei Wang, Yingjie Sun, Jingliang Xie, Yifan Zheng, Xiongbo Cui, Weihua Li, Rongxing Bian","doi":"10.1016/j.wasman.2025.114833","DOIUrl":"10.1016/j.wasman.2025.114833","url":null,"abstract":"<div><div>Municipal solid waste incineration slag has the potential to accelerate the stabilization of landfills, but the effects of key slag components (i.e., alkaline substances and ferromagnetic substances) on the landfilling process have not been systematically studied. Therefore, landfill bioreactors containing different types of incineration slag, including a control group (CK), raw slag (RS), iron-rich slag (FM), and alkali-rich slag (AL), mixed with refuse at 5% and 10% ratios, were established. The results showed that the addition of RS was superior than FM and AL in accelerating refuse degradation, and the degree of stabilization was significantly better at a high slag addition ratio (10%) than at a low ratio (5%). Addition of 10% RS was most effective in DOM removal in the leachate, which was mainly because the raw slag had a high content of alkaline substances (46.78%) and a relatively low content of ferromagnetic substances (7.01%). The addition of RS and AL increased the bacterial population in the early and middle stages of landfilling, but the addition of 10% FM resulted in a decrease in bacterial population. The dominant genus was <em>Lactobacillus</em> in the early stage of landfilling, while <em>Clostridium</em> and <em>Petrimonas</em> were the dominant genera in the late and final stages of landfilling in the slag addition systems, and alkaline substances played a vital role in the succession of bacterial community. The addition of slag promoted the abundance of amino acid metabolism and carbohydrate metabolism pathways involved in refuse degradation.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"202 ","pages":"Article 114833"},"PeriodicalIF":7.1,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877106","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

Zeolite synthesis using recycled silicon and aluminum components from spent FCC catalysts 用废催化裂化催化剂回收硅和铝组分合成沸石

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-04-25 DOI: 10.1016/j.wasman.2025.114817

Mathias S. Marschall, Markus Seifert, Mathias Hauck, Oliver Busse, Jan J. Weigand

{"title":"Zeolite synthesis using recycled silicon and aluminum components from spent FCC catalysts","authors":"Mathias S. Marschall, Markus Seifert, Mathias Hauck, Oliver Busse, Jan J. Weigand","doi":"10.1016/j.wasman.2025.114817","DOIUrl":"10.1016/j.wasman.2025.114817","url":null,"abstract":"<div><div>Significant efforts have been made to partially reuse FCC catalysts, particularly rare earth elements (REE), but only comprehensive recycling strategies can effectively contribute to a sustainable chemical industry. This work presents a novel recycling process for spent FCC catalyst materials, involving pre-treatment, selective separation of silica and alumina species, and synthesis of zeolites or zeolite-like materials. The process exclusively utilizes silicon and aluminum recovered from the spent FCC catalyst to produce high-quality catalyst components and sorbents. Optional rare earth element (REE) leaching, acid treatment after reactivation with sodium hydroxide, precipitation, and filtration yield silicon species (silica). The acidic, aluminum-rich filtrate is processed further by converting it into an alkaline medium with sodium hydroxide, enabling the precipitation and removal of unwanted heavy metals and rare earth elements. Aluminum species are recovered through neutralization of the alkaline solution, followed by precipitation and filtration. Overall, up to 95 % of the silicic acid and aluminum oxide are recovered. Subsequent chemical syntheses yield high-crystalline zeolite Y and ZSM-5 as active zeolites for FCC catalysts, alongside AlPO<sub>4</sub> as an alternative binder. A techno-economic analysis reveals a manageable turnover on industrial scale next to a refinery, while the costs still surpass current market prices, as long they do not care about environmental remediation. Unlike recent studies, no additional silicon and aluminum sources are required, which promotes a more independent local recycling. Furthermore, zeolite A was synthesized as a sorbent using the filtrate solution obtained during the production of zeolite Y, thus nearly completing the recycling loop.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"202 ","pages":"Article 114817"},"PeriodicalIF":7.1,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143870422","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

Analysis of lithium demand for electric vehicles from supply and demand perspectives under China’s carbon peak and neutrality goals 中国碳峰值和碳中和目标下的电动汽车锂需求供需分析

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-04-25 DOI: 10.1016/j.wasman.2025.114822

Linchang Zheng , Ge Chen , Bojie Wen , Wenqi Bao

{"title":"Analysis of lithium demand for electric vehicles from supply and demand perspectives under China’s carbon peak and neutrality goals","authors":"Linchang Zheng , Ge Chen , Bojie Wen , Wenqi Bao","doi":"10.1016/j.wasman.2025.114822","DOIUrl":"10.1016/j.wasman.2025.114822","url":null,"abstract":"<div><div>Securing lithium supplies and realizing China’s carbon peak and neutrality goals necessitates accurately grasping the extent of lithium demand in the transition to automobile electrification. This study investigates trends in lithium demand under different scenarios of EV development in China, considering the scale of electric vehicle (EV) sales and dynamic changes in lithium content per EV unit. The study elucidates the main factors affecting lithium demand of EVs from demand and supply perspectives, revealing three main outcomes: (1) Demand for lithium resources for EVs in China under low-, medium-, and high-demand intensity scenarios is expected to reach 340,000 t–450,000 t in 2035, which is 6–8 times higher than in 2022. (2) The main factor driving rapid growth in lithium demand for EVs is demand-side change, whereby EV demand for lithium resources in 2035 is expected to reach 260,000–350,000 t. (3) The impacts of supply-side change on lithium demand for EVs should not be ignored, whereby EV demand for lithium in 2035 is expected to be close to 11,3000 t. (4) The lithium recovery potential for electric vehicles is increasing rapidly. Under low-, medium-, and high-intensity demand scenarios, the recovered lithium is projected to account for 30 %–31 % of the total lithium demand for electric vehicles by 2035. Supplying lithium for EVs in China will become increasingly vital and challenging in the future.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"202 ","pages":"Article 114822"},"PeriodicalIF":7.1,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143870423","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

Ecotoxicological impact of deactivated asbestos-cement on soil ecosystems 失活石棉水泥对土壤生态系统的生态毒理学影响

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-04-24 DOI: 10.1016/j.wasman.2025.114825

Ilaria Negri , Erica Saldi , Giancarlo Capitani

{"title":"Ecotoxicological impact of deactivated asbestos-cement on soil ecosystems","authors":"Ilaria Negri , Erica Saldi , Giancarlo Capitani","doi":"10.1016/j.wasman.2025.114825","DOIUrl":"10.1016/j.wasman.2025.114825","url":null,"abstract":"<div><div>The effects of thermally deactivated asbestos cement (DAC) on the soil ecosystem were evaluated using the soil model organism <em>Folsomia candida</em> (Collembola). Two materials were obtained by treating asbestos cement slates, commonly used for roofing, at 1100 °C under oxidizing conditions (Red DAC) and at 1150 °C under reducing conditions (Green DAC). Ten age-synchronized juveniles of <em>F. candida</em> were exposed to DAC powder:soil mixtures in ratios of 1:1 and 1:10 for both types. After 28 days, adults and juveniles were counted to assess treatment effects.</div><div>The results indicate distinct toxicity profiles. The Red powder did not induce adult lethality at the tested concentrations; however, a significant reduction in juvenile production was observed at the higher concentration (1:1). In contrast, the Green powder caused adult lethality at 1:1 concentration, with no juveniles produced.</div><div>Both materials contain a high percentage of silica glass (∼40% by weight), a well-known insect dehydration agent and mechanical insecticide. At the highest concentration, silica glass may cause detrimental effects on juveniles, which are more sensitive to dehydration than adults. Green DAC also contains 8.5% lime (CaO), an antimicrobial and insecticidal agent that can disrupt soil pH. The combination of silica-induced dehydration and lime-mediated alkalinity may account for the lethal effects of Green DAC on <em>F. candida</em> adults. These findings reinforce the need for proper DAC recycling. While asbestos deactivation effectively eliminates its hazard in the built environment, improper disposal or soil contamination may pose ecological risks. Recycling DAC into stable matrices, such as ceramics or mortar, minimizes environmental contamination while promoting circular economy.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"202 ","pages":"Article 114825"},"PeriodicalIF":7.1,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864969","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

Enhanced microbial activity for moisture removal in biodrying with the assistance of stacked MFCs 在堆叠mfc的帮助下，生物干燥过程中微生物活性的增强

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-04-23 DOI: 10.1016/j.wasman.2025.114813

Xia Hou , Xin Wang , Yulin Zhang , Zegang Fu , Lei Zhang , Aimin Li

{"title":"Enhanced microbial activity for moisture removal in biodrying with the assistance of stacked MFCs","authors":"Xia Hou , Xin Wang , Yulin Zhang , Zegang Fu , Lei Zhang , Aimin Li","doi":"10.1016/j.wasman.2025.114813","DOIUrl":"10.1016/j.wasman.2025.114813","url":null,"abstract":"<div><div>Low microbial activity affected the organics degradation and limited the improvement of matrix temperature, leading to inefficient drying performance in conventional biordying (CB). In this study, two microbial fuel cells (MFCs) connected in series were applied on biodrying to facilitate water removal. Compared with CB process, moisture content (MC) of organic waste for stacked MFCs assisted biodrying (MB) process was rapidly decreased by 36.7 % within 6 days (CB: 13.8 %). Meanwhile, the assist of MFCs reshaped microbial communities and enriched electroactive bacteria <em>Bacillus</em>, 1.5 times and 3.4 times higher than those in CB during thermophilic and cooling phase, respectively. It could facilitate extracellular electron transfer and thus improving the reaction with O<sub>2</sub>. The analysis of O<sub>2</sub> content also proved that electric field provided by stacked MFCs boosted O<sub>2</sub> utilization and stimulated microbial metabolism. Therefore, organics biodegradation was greatly increased by 50.0 % and high-temperature duration was prolonged from 1.4 d to 2.3 d, which were essential driving forces for water removal. The dried product of MB was identified to be a satisfactory refuse-derived fuel (RDF) with low heating value of 9.35 MJ/kg, which was about 1.57-fold higher than that of CB. These results suggested that stacked MFCs assisted biodrying is an effective technology to ameliorate conventional biodrying, achieving rapid drying of municipal solid wastes with high MC and helping to improve the resource utilization of wastes. In particular, the integration of MFCs using reality organic wastewater as substrate and biodrying system could provide a feasible reference for the development of circular economy.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"202 ","pages":"Article 114813"},"PeriodicalIF":7.1,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864968","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

Comparative life cycle assessment of sewage sludge drying by solar and thermal drying technologies 太阳能和热干燥技术对污泥干燥生命周期的比较评价

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-04-23 DOI: 10.1016/j.wasman.2025.114826

I.Ethem Karadirek, Onur Erkaya, Aslı S. Ciggin

{"title":"Comparative life cycle assessment of sewage sludge drying by solar and thermal drying technologies","authors":"I.Ethem Karadirek, Onur Erkaya, Aslı S. Ciggin","doi":"10.1016/j.wasman.2025.114826","DOIUrl":"10.1016/j.wasman.2025.114826","url":null,"abstract":"<div><div>Sewage sludge management is a critical challenge requiring sustainable treatment solutions. Drying is an essential pre-treatment step for utilizing sludge in waste-to-energy systems. Although drying is an essential step in sludge management, it has often been represented in a simplified manner using general assumptions in life cycle assessment (LCA) studies aimed at evaluating environmental impacts and greenhouse gas emissions. In many assessments, sludge drying has been identified as the most environmentally burdensome stage of sludge management due to its high energy demand, with solar drying frequently proposed as a low-energy alternative. Given these findings, optimizing the environmental performance of the sludge drying process is crucial for reducing the overall life cycle impacts of sludge management. Accordingly, this study aims to compare the environmental impacts of thermal drying technologies (belt, fluidized bed, and rotary) and solar drying using a gate-to-gate LCA approach. Additionally, impact reduction scenarios were assessed, including renewable energy integration and adjusting the final solids content of sludge. The LCA was performed using the ReCiPe 2016 Endpoint (H) method. Results indicate that using photovoltaic electricity and waste-incineration steam can significantly lower the environmental impacts of belt and rotary dryers, making them comparable to solar drying. On the other hand, solar drying’s high land demand remains a major limitation. These findings provide key insights for decision-makers, helping optimize sludge drying processes with lower environmental impacts. The study highlights the importance of technology-specific strategies and renewable energy integration in wastewater treatment plants.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"201 ","pages":"Article 114826"},"PeriodicalIF":7.1,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860472","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

Zero-shot and few-shot multimodal plastic waste classification with vision-language models 基于视觉语言模型的零次和少次多模态塑料垃圾分类

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-04-23 DOI: 10.1016/j.wasman.2025.114815

Iman Ranjbar , Yiannis Ventikos , Mehrdad Arashpour

{"title":"Zero-shot and few-shot multimodal plastic waste classification with vision-language models","authors":"Iman Ranjbar , Yiannis Ventikos , Mehrdad Arashpour","doi":"10.1016/j.wasman.2025.114815","DOIUrl":"10.1016/j.wasman.2025.114815","url":null,"abstract":"<div><div>The construction sector is a large consumer of plastic, generating substantial volumes of plastic waste. Effective recycling of this waste requires accurate classification, as different plastic materials undergo distinct recycling processes to retain their value. Existing approaches for plastic waste classification predominantly utilise fully supervised deep learning models, which require extensive labelled datasets. Such datasets are challenging to compile and label, and restrict the model’s generalisability and scalability, as identifying new plastic classes necessitates additional labelled data. Hence, this paper explores the application of Vision-Language Models (VLMs) for classifying construction and demolition plastic waste by resin type. VLMs offer the advantage of generalising to unseen categories through zero-shot learning, utilising only the natural language descriptions of visual concepts. Comprehensive experiments are conducted to evaluate the efficacy of advanced VLMs, in zero-shot classification of plastic waste, using natural language descriptions of plastic categories. Furthermore, image and textual modalities are integrated in multimodal few-shot learning frameworks and the outcomes are compared with those from data-intensive, fully supervised baselines to assess a balance between accuracy, scalability, and data efficiency. The findings demonstrate that VLMs effectively classify end-of-life plastics with minimal to no training data, with the best-performing models achieving 70.15 % accuracy in zero-shot classification and improving to 85.07 % with multimodal few-shot learning, showcasing substantial improvements in data efficiency and scalability.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"202 ","pages":"Article 114815"},"PeriodicalIF":7.1,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864886","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

Detailed analysis of olefins and diolefins in hydrotreated plastic waste pyrolysis oils by GC-VUV 采用气相色谱-紫外分光光度法对加氢处理后的废塑料热解油中的烯烃和二烯烃进行了详细分析

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-04-23 DOI: 10.1016/j.wasman.2025.114828

Yannick Ureel , César Pernalete Piña , Melissa N. Dunkle , Pascal Pijcke , Bruno da Costa Magalhaes , Marvin Kusenberg , Georgios Bellos , Maarten K. Sabbe , Joris W. Thybaut , Kevin M. Van Geem

{"title":"Detailed analysis of olefins and diolefins in hydrotreated plastic waste pyrolysis oils by GC-VUV","authors":"Yannick Ureel , César Pernalete Piña , Melissa N. Dunkle , Pascal Pijcke , Bruno da Costa Magalhaes , Marvin Kusenberg , Georgios Bellos , Maarten K. Sabbe , Joris W. Thybaut , Kevin M. Van Geem","doi":"10.1016/j.wasman.2025.114828","DOIUrl":"10.1016/j.wasman.2025.114828","url":null,"abstract":"<div><div>Recently, the hydrotreatment of plastic waste pyrolysis oils has been considered a promising route to remove heteroatoms and unsaturates from plastic pyrolysis oils to be used as steam cracking feedstock. As plastic waste pyrolysis oils differ vastly in composition from conventional crude oils, accurately identifying the different molecular species present in the mixture is essential to acquire further insights into their hydrogenation pathways. This work used gas chromatography coupled to a vacuum ultraviolet detector (GC-VUV) to obtain accurate quantification of (di)olefins compared to more conventional methods. It was found that there is no difference in intrinsic hydrogenation rates between diolefins and olefins, at least for chain lengths above C<sub>10</sub>. Moreover, an explicit dependency of the carbon chain length is identified on the hydrogenation rate for both olefins and diolefins with optimal hydrogenation rates up to C<sub>15</sub>. This is a consequence of the competition between hydrogenation and cracking reactions. Shorter unsaturated chains are thus formed because intrapore diffusional limitations prevent the hydrogenation of larger species. In addition, the degree of substitution (non-branched, methyl, dimethyl, trimethyl, etc.) of the unsaturated molecules mattered concerning the hydrogenation rate. Linear olefins were more rapidly hydrogenated than branched components. Apart from hydrogenation, skeletal isomerization reactions are also important, especially at high olefin conversions. These fundamental insights demonstrate the capability of GC-VUV to analyze hydrotreated plastic pyrolysis oils and provide essential knowledge for designing and optimizing the hydrotreatment processes of plastic waste pyrolysis oils.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"202 ","pages":"Article 114828"},"PeriodicalIF":7.1,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864887","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 investigation on co-combustion of sludge and coal in a 660 MW pulverized coal boiler 660mw煤粉锅炉中污泥与煤共燃的数值研究

IF 7.1 2区环境科学与生态学

Waste management Pub Date : 2025-04-22 DOI: 10.1016/j.wasman.2025.114814

Guozhen Xiao, Qihang Ye, Zhaoping Zhong, Baosheng Jin

{"title":"Numerical investigation on co-combustion of sludge and coal in a 660 MW pulverized coal boiler","authors":"Guozhen Xiao, Qihang Ye, Zhaoping Zhong, Baosheng Jin","doi":"10.1016/j.wasman.2025.114814","DOIUrl":"10.1016/j.wasman.2025.114814","url":null,"abstract":"<div><div>The co-combustion of sludge in coal-fired boilers, as a novel approach to sludge treatment, holds promising prospects for extensive application. The numerical simulation method is employed in this study to model the co-combustion of sludge in a 660 MW pulverized coal boiler at a power plant. By varying operational conditions, we thoroughly investigate the impact of sludge blending ratio, moisture content, and boiler load on combustion performance and pollutant emissions. The numerical investigation reveals that the impact on the boiler remains relatively insignificant when the blending ratio is below 10 %. However, surpassing a blending ratio of 10 % leads to a substantial reduction in temperature. Specifically, at a blending ratio of 20 %, there is an average temperature decrease of 9.3 K observed across each sections of the boiler. Moreover, as the blending ratio increases, there is a concurrent decline in SO<sub>2</sub> and NO<sub>x</sub> levels, while CO exhibits an upward trend. Increasing the moisture content will result in a reduction in boiler temperature. In comparison to sludge with a 25 % moisture content, blending sludge with a 45 % moisture content will cause an average temperature decrease of approximately 10 K within the boiler. Augmenting the moisture content will diminish the concentrations of SO<sub>2</sub> and NO<sub>x</sub>, while concurrently leading to an elevation in CO concentration (up to a maximum of 107.4 mg/Nm<sup>3</sup>). The internal temperature and outlet pollutant concentrations both escalate as the boiler load increases. Based on this study, the optimal sludge blending ratio is determined to be 10 %, accompanied by a moisture content of 35 %.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"202 ","pages":"Article 114814"},"PeriodicalIF":7.1,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859314","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