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Evaluation of the shear stability of aerobic granular sludge from a pilot-scale membrane bioreactor:Establishment of a quantitative method

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Journal of environmental Sciences 2025年第2期148卷 579-590页

作者： Biao Yang Bingduo Wang Liying Bin Weirui Chen Xinyi Chen Ping Li Shanglong Wen Shaosong Huang Zhiqi Zhang Bing Tang School of environmental Science and Engineering Guangdong University of TechnologyGuangzhou 510006China Guangdong Guangshen environmental Protection Technology co. Ltd.Guangzhou 510663China Guangdong Yuehai Water Investment co. Ltd.Shenzhen 518000China

This work established a quantitative method to access the shear stability of aerobic granular sludge(AGS)and validated its feasibility by using the mature AGS from a pilot-scale(50 tons/day)membrane bioreactor(MBR)for treating real municipal *** results showed that the changing rate( S)of the peak area(S)of granule size distribution(GSD)exhibited an exponential relationship(R^(2)≥0.76)with the shear time(y=a−b·cx),which was a suitable indicative index to reflect the shear stability of different AGS *** limiting granule size(LGS)was defined and proposed to characterize the equilibrium size for AGS after being sheared for a period of time,whose value in terms of Dv50 showed high co.relation(R^(2)=0.92)with the parameter *** free Ca^(2+)(28.44-34.21 mg/L)in the influent specifically interacted with polysaccharides(PS)in the granule’s extracellular polymeric substance(EPS)as a nucleation site,thereby inducing the formation of Ca precipitation to enhance its Young’s modulus,while Ca2+primarily interacted with PS in soluble metabolic product(SMP)during the initial granulation ***,the Young’s modulus significantly affected the parameter a related to shear stability(R^(2)=0.99).Since the parameter a was more closely related(R^(2)=1.00)to S than that of the parameter b or c,the excellent co.relation(R^(2)=0.99)between the parameter a and the wet density further verified the feasibility of this method.

关键词： Shear stability Quantitative evaluation Aerobic granular sludge Membrane bioreactor Pilot-scale study Municipal wastewater

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The mechanisms of pH regulation on promoting volatile fatty acids production from kitchen waste

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Journal of environmental Sciences 2025年第1期147卷 414-423页

作者： Feng Liu Tingting Wang Leiyu Feng Yinguang Chen co.lege of environmental Science and Engineering Tongji UniversityShanghai 200092China TUS-environmental Science and Technology Development co. Ltd.Beijing 100084China

The anaerobic acid production experiments were co.ducted with the pretreated kitchen waste under pH *** results showed that pH 8 was co.sidered to be the most suitable co.dition for acid production,especially for the formation of acetic acid and propionic *** average value of total volatile fatty acid at pH 8 was 8814 mg co./L,1.5 times of that under blank *** average yield of acetic acid and propionic acid was 3302 mg co./L and 2891 mg co./L,*** activities of key functional enzymes such as phosphotransacetylase,acetokinase,oxaloacetate transcarboxylase and succinylco. transferase were all *** further explore the regulatory mechanisms within the system,the distribution of microorganisms at different levels in the fermentation system was obtained by microbial sequencing,results indicating that the relative abundances of Clostridiales,Bacteroidales,Chloroflexi,Clostridium,Bacteroidetes and Propionibacteriales,which were great co.tributors for the hydrolysis and acidification,increased rapidly at pH 8 co.pared with the blank ***,the proportion of genes enco.ing key enzymes was generally increased,which further verified the mechanism of hydrolytic acidification and acetic acid production of organic matter under pH regulation.

关键词： Kitchen waste Acid fermentation Volatile fatty acids pH regulation Functional genes

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co.ransport of nanoplastics with nZnO in saturated porous media:From brackish water to seawater

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Journal of environmental Sciences 2025年第2期148卷 541-552页

作者： Yuanzhang Hou Yange Wang Yidi Zhang Zhibo Lu Zhenbo Zhang Zhiqiang Dong Yuping Qiu Department of environmental Science College of Environmental Science and EngineeringTongji UniversityState Key Laboratory of Pollution Control and Resources ReuseShanghai Institute of Pollution Control and Ecological SecurityShanghai 200092China School of Medicine Tongji UniversityShanghai 200065China Municipal environmental Protection Engineering co. Ltd of CERC Shanghai GroupShanghai 201906China China Railway Engineering Group co. Beijing 100039China

The ocean serves as a repository for various types of artificial ***(NPs)and nano zinc oxide(nZnO),which are frequently employed in personal care products and food packaging materials,are likely simultaneously released and eventually into the ocean with surface ***,their mutual influence and shared destiny in marine environment cannot be *** study examined how nanomaterials interacted and transported through sea sand in various salinity *** showed that NPs remained dispersed in brine,while nZnO formed *** seawater of 35 practical salinity units(PSU),nZnO formed heteroaggregates with NPs,inhibiting NPs mobility and decreasing the reco.ered mass percentage(Meff)from 24.52%to 12.65%.In 3.5 PSU brackish water,nZnO did not significantly aggregate with NPs,and thus barely affected their ***,NPs greatly enhanced nZnO transport with Meff increasing from 14.20%to 25.08%,attributed to the carrier effect of higher mobility *** from brackishwater to seawater was simulated in salinity change experiments and revealed a critical salinity threshold of 10.4 PSU,below which the mobility of NPs was not affected by co.xisting nZnO and above which nZnO strongly inhibited NP *** study highlights the importance of co.sidering the mutual influence and shared destiny of artificial nanoparticles in the marine environment and how their interaction and co.ransport are dependent on changes in seawater salinity.

关键词： Homoaggregate Heteroaggregate Transport Sea sand Salinity threshold

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Effects of Ti-and Nb-based transition element from single to multiple co.pound oxides and carbon-based co.posite additives on Mg-MgH2 hydrogen storage material

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Tungsten 2025年第1期7卷 32-49页

作者： Li-Rong Xiao Chen Chen Shuo Wang Zi-Yin Dai Hideo Kimura Cui Ni Chuan-Xin Hou Xue-Qin Sun Si-Jie Guo Wei Du Xiu-Bo Xie School of environmental and Material Engineering Yantai University Bosch HUAYU Steering Systems (Yantai) co. Ltd.Ytp/MFE University of Tennessee Knoxville Shandong Key laboratory of Eco.environmental Science for the Yellow River Delta Shandong University of Aeronautics

MgH2is co.sidered as a promising hydrogen storage material for its high hydrogen storage capacity,low co.t and abundant resource ***,the low kinetics and high enthalpy formation of MgH2limit its wide *** the perspective of adding catalysts to enhance the hydrogen storage properties of Mg-MgH2,this article elaborated the main catalysts based on Ti and Nb transition elements,including single oxide catalysts,binary oxides catalysts（co.bined with Ni,Na,Sr,V,etc.）,multiple catalysts bound to carbon,and co.posite catalysts with Ti and Nb elements co.bined with MXene ***,the main pathways of various catalysts to reduce the reaction activity and broaden the hydrogen desorption channel were also *** Ti-based catalysts can enhance the reactive sites of the matrix by forming multivalent states,while Nb-based catalysts broaden the hydrogen reaction channels by forming tiny *** improving the size structure and enhancing the grain size stability,co.bined with carbon materials should be the future co.siderations.

关键词： Catalysts Mg-based hydrogen storage alloys Solid hydrogen storage Transition metal elements

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Carbon emissions in China’s steel industry from a life cycle perspective:Carbon footprint insights

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Journal of environmental Sciences 2025年第2期148卷 650-664页

作者： Xiaoco.g Song Shuai Du Chenning Deng Peng Shen Minghui Xie Ci Zhao Chen Chen Xiaoyu Liu State Key laboratory of environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China Beijing Key laboratory of Water Resources&environmental Engineering China University of Geosciences(Beijing)Beijing 100083China Chinese Research Academy of environmental Sciences environmental Technology&Engineering co.ltd. Beijing 100012China

China is the most important steel producer in the world,and its steel industry is one of themost carbon-intensive industries in ***,research on carbon emissions from the steel industry is crucial for China to achieve carbon neutrality and meet its sustainable global development *** co.structed a carbon dioxide(co.(2))emission model for China’s iron and steel industry froma life cycle perspective,co.ducted an empirical analysis based on data from2019,and calculated the co.(2)emissions of the industry throughout its life *** emission reduction factors were identified using sensitivity *** results demonstrated that the co.(2)emission intensity of the steel industry was 2.33 ton co.(2)/ton,and the production and manufacturing stages were the main sources of co.(2)emissions,acco.nting for 89.84%of the total steel life-cycle ***,fossil fuel co.bustion had the highest sensitivity to steel co.(2)emissions,with a sensitivity co.fficient of 0.68,reducing the amount of fossil fuel co.bustion by 20%and carbon emissions by 13.60%.The sensitivities of power structure optimization and scrap co.sumption were similar,while that of the transportation structure adjustment was the lowest,with a sensitivity co.fficient of less than *** the current strategic goals of peak carbon and carbon neutrality,it is in the best interest of the Chinese government to actively promote energy-saving and low-carbon technologies,increase the ratio of scrap steel to steelmaking,and build a new power system.

关键词： Iron and steel industry Life cycle Carbon dioxide(co.(2))emissions Carbon footprint China

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Microplastics enhance the adsorption capacity of zinc oxide nanoparticles:Interactive mechanisms and influence factors

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Journal of environmental Sciences 2025年第1期147卷 665-676页

作者： Weiping Xiong Min Hu Siying He Yuhang Ye Yinping Xiang Haihao Peng Zhaomeng Chen Zhengyong Xu Honglin Zhang Weixiang Li Shudian Peng co.lege of environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control(Hunan University)Ministry of EducationChangsha 410082China Hunan Boke environmental Engineering co.ltd. Hengyang 421099China co.lege of environmental Protection and Safety Engineering University of South ChinaHengyang 421001China Hunan Modern environmental Technology co.ltd. Changsha 410004China

Microplastics(MPs)are of particular co.cern due to their ubiquitous occurrence and propensity to interact and co.centrate various waterborne co.taminants from aqueous *** on the interaction and joint toxicity of MPs on engineered nanoparticles(ENPs)are exhaustive,but limited research on the effect of MPs on the properties of ENPs in multisolute ***,the effect of MPs on adsorption ability of ENPs to antibiotics was investigated for the first *** results demonstrated that MPs enhanced the adsorption affinity of ENPs to antibiotics and MPs before and after aging showed different effects on *** polyamide prevented aggregation of ZnONPs by introducing negative charges,whereas virgin polyamide affected ZnONPs with the help of electrostatic ***-IR and XPS analyses were used to probe the physico.hemical interactions between ENPs and *** results showed no chemical interaction and electrostatic interactionwas the dominant force between ***,the adsorption rate of antibiotics positively co.related with pH and humic acid but exhibited a negative co.relation with ionic *** study highlights that ENPs are highly capable of accumulating and transporting antibiotics in the presence of MPs,which co.ld result in a widespread distribution of antibiotics and an expansion of their environmental risks and toxic effects on *** also improves our understanding of the mutual interaction of various co.existing co.taminants in aqueous environments.

关键词： Microplastics Engineered nanoparticles Adsorption Tetracycline

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Removal of particulate matter and dissolved organic matter from sedimentation sludge water during pre-sedimentation process:Performances and mechanisms

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Journal of environmental Sciences 2025年第2期148卷 409-419页

作者： Shule Duan Huiyu Dong Caifang Jiang Hong Liang Ling Jiang Qian Xu Xiaoyu Cheng Zhimin Qiang Key laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Guangxi Nanning Water co. Ltd.Nanning 530029China

Sedimentation sludge water(SSW),a prominent co.stituent of wastewater from drinking water treatment plants,has received limited attention in terms of its treatment and utilization likely due to the perceived difficulties associated with managing SSW *** study co.prehensively evaluated the water quality of SSW by co.paring it to a well-documented wastewater(filter backwash water(FBW)).Furthermore,it investigated the pollutant variations in the SSW during pre-sedimentation process,probed the underlying reaction mechanism,and explored the feasibility of employing a pilot-scale co.gulation-sedimentation process for SSW *** levels of most water quality parameters were generally co.parable between SSW and *** the pre-sedimentation of SSW,significant removal of turbidity,bacterial co.nts,and dissolved organic matter(DOM)was *** characterization of DOM co.ponents,molecular weight distributions,and optical properties revealed that the macromolecular proteinaceous biopolymers and humic acids were preferentially *** characterization of particulates indicated that high surface energy,zeta potential,and bridging/adsorption/sedimentation/co.gulation capacities in aluminum residuals of SSW,undersco.ing its potential as a co.gulant and promoting the generation and sedimentation of inorganic-organic *** co.gulation-sedimentation process co.ld effectively remove pollutants from low-turbidity SSW([turbidity]0<15 NTU).These findings provide valuable insights into the water quality dynamics of SSW during the pre-sedimentation process,facilitating the development of SSW quality management and enhancing its reuse rate.

关键词： Sedimentation sludge water Filter backwash water Reuse Health risk co.gulation-sedimentation

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Effects of biomass co.pyrolysis and herbaceous plant co.onization on the transformation of tailings into soil like substrate

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Journal of environmental Sciences 2025年第1期147卷 230-243页

作者： Bin Zhu Meiyan Si Xin Xie Ximin Yan Jianhong Huang Senlin Tian Ping Ning Faculty of environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China Guizhou Research Institute of co.l Mine Design co. Ltd.Guiyang 550025China

Enhancing soil organic matter characteristics,ameliorating physical structure,mitigating heavy metal toxicity,and hastening mineral weathering processes are crucial approaches to acco.plish the transition of tailings substrate to a soil-like *** inco.poration of biomass co.pyrolysis and plant co.onization has been established to be a significant factor in soil substrate formation and soil pollutant *** this,there is presently an absence of research efforts aimed at synergistically utilizing these two technologies to expedite the process of mining tailings soil substrate *** current study aimed to investigate the underlying mechanism of geochemical changes and rapid mineral weathering during the process of transforming tailings substrate into a soil-like substrate,under the co.bined effects of biomass co.smoldering pyrolysis and plant *** findings of this study suggest that the inco.poration of smoldering pyrolysis and plant co.onization induces a high-temperature effect and biological effects,which enhance the physical and chemical properties of tailings,while simultaneously accelerating the rate of mineral *** improvements include the amelioration of extreme pH levels,nutrient enrichment,the formation of aggregates,and an increase in enzyme activity,all of which co.lectively demonstrate the successful attainment of tailings substrate *** of the acceleratedweathering was verified by phase and surfacemorphology analysis using X-ray diffraction and scanning electron *** co.rosion and fragmentation on the surface *** weathering resulted in co.rosion and fragmentation of the surface of the treated *** study co.firms that co.smoldering pyrolysis of biomass,co.bined with plant co.onization,can effectively promote the transformation of tailings into soil-like *** method has can effectively address the key challenges that have previously hind

关键词： Smoldering Biomass co.pyrolysis Phytoremediation Soil-like substrate Tailing restoration

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Bioenergy reco.ery and carbon emissions benefits of short-term bio-thermophilic pretreatment on low organic sewage sludge anaerobic digestion:A pilot-scale study

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Journal of environmental Sciences 2025年第2期148卷 321-335页

作者： Hui Wang Xiang Fu Haozhe Huang Danni Shen Dongdong Fan Liming Zhu Xiaohu Dai Bin Dong co.lege of environmental Science and Engineering Tongji UniversityShanghai 200092China Yangtze Eco.Environment Engineering Research Center China Three Gorges CorporationBeijing 100038China Yangtze River Eco.environmental Engineering Research Center Shanghai InvestigationDesign and Research Institute Co.LTDShanghai 200092China China co.struction Third Engineering Bureau First Engineering co. Ltd.Wuhan 430000China

Sewage sludge in cities of Yangzi River Belt,China,generally exhibits a lower organic co.tent and higher silt co.tentdue to leakage of drainage system,which caused low bioenergy reco.ery and carbon emission benefits in co.ventional anaerobic digestion(CAD).Therefore,this paper is on a pilot scale,a bio-thermophilic pretreatment anaerobic digestion(BTPAD)for low organic sludge(volatile solids(VS)of 4%)was operated with a long-term co.tinuous flow of 200 *** VS degradation rate and CH_(4) yield of BTPAD increased by 19.93%and 53.33%,respectively,co.pared to those of *** analysis of organic co.positions in sludge revealed that BTPAD mainly improved the hydrolysis of proteins in *** analysis of microbial co.munity proportions by high-throughput sequencing revealed that the short-term bio-thermophilic pretreatment was enriched in Clostridiales,co.rothermobacter and Gelria,was capable of hydrolyzing acidified proteins,and provided more volatile fatty acid(VFA)for the subsequent *** co.bined with fluorescence quantitative polymerase chain reaction(PCR)analysis showed that the number of bacteria with high methanogenic capacity in BTPAD was much higher than that in CAD during the medium temperature digestion stage,indicating that short-term bio-thermophilic pretreatment co.ld provide better methanogenic co.ditions for ***,the greenhouse gas emission footprint analysis showed that short-term bio-thermophilic pretreatment co.ld reduce the carbon emission of sludge anaerobic digestion system by 19.18%.

关键词： Sludge Anaerobic digestion Bio-thermophilic pretreatment Pilot scale Molecular microbiology Carbon emissions

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LiDAR-Visual SLAM with Integrated Semantic and Texture Information for Enhanced Eco.ogical Monitoring Vehicle Localization

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co.puters, Materials & co.tinua 2025年第1期82卷 1401-1416页

作者： Yiqing Lu Liutao Zhao Qiankun Zhao Foreign environmental co.peration Center Ministry of Ecology and Environment of PRCBeijing100035China Beijing co.puting Center co. Ltd.Beijing Academy of Science and TechnologyBeijing100083China Beijing Guyu Interactive Artificial Intelligence Application co. Ltd.Beijing100024China

Eco.ogical monitoring vehicles are equipped with a range of sensors and monitoring devices designed to gather data on eco.ogical and environmental *** vehicles are crucial in various fields,including environmental science research,eco.ogical and environmental monitoring projects,disaster response,and emergency management.A key method employed in these vehicles for achieving high-precision positioning is LiDAR(lightlaser detection and ranging)-Visual Simultaneous Localization and Mapping(SLAM).However,maintaining highprecision localization in co.plex scenarios,such as degraded environments or when dynamic objects are present,remains a significant *** address this issue,we integrate both semantic and texture information from LiDAR and cameras to enhance the robustness and efficiency of data ***,semantic information simplifies the modeling of scene elements,reducing the reliance on dense point clouds,which can be less ***,visual texture information co.plements LiDAR-Visual localization by providing additional co.textual *** inco.porating semantic and texture details frompaired images and point clouds,we significantly improve the quality of data association,thereby increasing the success rate of *** approach not only enhances the operational capabilities of eco.ogical monitoring vehicles in co.plex environments but also co.tributes to improving the overall efficiency and effectiveness of eco.ogical monitoring and environmental protection efforts.

关键词： LiDAR-Visual simultaneous localization and mapping integrated semantic texture information

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