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Development of a coupled model to simulate and assess arsenic contamination and impact factors in the Jinsha River Basin,China

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Journal of Environmental sciences 2025年第1期147卷 50-61页

作者： Yidian Sun Xu Zhang Hong Peng Wenting Zhou Anna Jiang Feng Zhou Hao Wang Wanshun Zhang School of Resource and Environmental sciences Wuhan UniversityWuhan 430079China School of water Conservancy and Hydropower Engineering Wuhan UniversityWuhan 430072China China Institute of water Resources and Hydropower Research Beijing 100038China School of water Resources and Hydropower State Key Laboratory of Water Resources and Hydropower Engineering ScienceWuhan UniversityWuhan 430072China

With the increasing severity of arsenic(As)pollution,quantifying the environmental behavior of pollutant based on numerical model has become an important approach to determine the potential impacts and finalize the precise control *** the industrialintensive Jinsha River Basin as typical area,a two-dimensional hydrodynamic water quality model coupled with Soil andwater Assessment Tool(SWAT)model was developed to accurately simulate the watershed-scale distribution and transport of As in the terrestrial and aquatic environment at high spatial and temporal *** effects of hydro-climate change,hydropower station construction and non-point source emissions on Aswere quantified based on the coupled *** result indicated that higher As concentration areas mainly centralized in urban districts and concentration slowly decreased from upstream to *** to the enhanced rainfall,the As concentration was significantly higher during the rainy season than the dry ***-climate change and the construction of hydropower station not only affected the dissolved As concentration,but also affected the adsorption and desorption of As in ***,As concentration increased with the input of non-point source pollution,with the maximum increase about 30%,resulting that non-point sources contributed important pollutant impacts to *** coupled model used in pollutant behavior analysis is generalwith high potential application to predict and mitigate water pollution.

关键词： watershed system Arsenic Modeling Distribution Hydro-climate change Non-point source pollution

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Metagenomic perspectives on antibiotic resistance genes in tap water:The environmental characteristic,potential mobility and health threat

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Journal of Environmental sciences 2025年第1期147卷 582-596页

作者： Qiyue Meng Yibo Zhang Da He Yu Xia Jie Fu Chenyuan Dang School of Environmental science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Ecological Impacts of Hydraulic Projects and Restoration of Aquatic Ecosystem of Ministry of water Resources Institute of HydroecologyMinistry of Water Resources&Chinese Academy of SciencesWuhan 430074China School of Environmental science and Engineering College of EngineeringSouthern University of Science and TechnologyShenzhen 518055China

As an emerging environmental contaminant,antibiotic resistance genes(ARGs)in tap water have attracted great *** studies have provided ARG profiles in tap water,research on their abundance levels,composition characteristics,and potential threat is still ***,9 household tap water samples were collected from the Guangdong-Hong Kong-Macao Greater Bay Area(GBA)in ***,75 sets of environmental sample data(9 types)were downloaded from the public *** was then performed to explore the differences in the abundance and composition of ARGs.221 ARG subtypes consisting of 17 types were detected in tap *** the ARG abundance in tap water was not significantly different from that found in drinking water plants and reservoirs,their composition *** tap water samples,the three most abundant classes of resistance genes were multidrug,fosfomycin and MLS(macrolide-lincosamidestreptogramin)ARGs,and their corresponding subtypes ompR,fosX and macB were also the most abundant ARG *** the potential mobility,vanS had the highest abundance on plasmids and viruses,but the absence of key genes rendered resistance to vancomycin ***,the majority of ARGs present in tap water were those that have not been assessed and are currently not listed as high-threat level ARG families based on the World Health Organization *** the current potential threat to human health posed by ARGs in tap water is limited,with persistent transfer and accumulation,especially in pathogens,the potential danger to human health posed by ARGs should not be ignored.

关键词： Antibiotic resistance genes Tap water Plasmids Viruses Health threat

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Occurrence of phthalate esters in the yellow and Yangtze rivers of china:Risk assessment and source apportionment

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Journal of Environmental sciences 2025年第3期149卷 628-637页

作者： Qinkui Miao Wenxiang Ji Huiyu Dong Ying Zhang College of Environmental science and Engineering Nankai UniversityTianjin 300350China Key Laboratory of Drinking water science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

Phthalate esters(PAEs),recognized as endocrine disruptors,are released into the environment during usage,thereby exerting adverse ecological *** study investigates the occurrence,sources,and risk assessment of PAEs in surface water obtained from 36 sampling points within the Yellow River and Yangtze River *** total concentration of PAEs in the Yellow River spans from124.5 to 836.5 ng/L,with Dimethyl phthalate(DMP)(75.4±102.7 ng/L)and Diisobutyl phthalate(DiBP)(263.4±103.1 ng/L)emerging as the predominant *** exhibit a pattern of upstream(512.9±202.1 ng/L)>midstream(344.5±135.3 ng/L)>downstream(177.8±46.7 ng/L).In the Yangtze River,the total concentration ranges from 81.9 to 441.6 ng/L,with DMP(46.1±23.4 ng/L),Diethyl phthalate(DEP)(93.3±45.2 ng/L),and DiBP(174.2±67.6 ng/L)as the primary *** levels follow a midstream(324.8±107.3 ng/L)>upstream(200.8±51.8 ng/L)>downstream(165.8±71.6 ng/L)*** should be directed towards the moderate ecological risks of DiBP in the upstream of HH,and both the upstream and midstream of CJ need consideration for the moderate ecological risks associated with Di-n-octyl phthalate(DNOP).Conversely,in other regions,the associated risk with PAEs is either low or *** main source of PAEs in Yellow River is attributed to the release of construction land,while in the Yangtze River Basin,it stems from the accumulation of pollutants in lakes and forests discharged into the *** findings are instrumental for pinpointing sources of PAEs pollution and formulating control strategies in the Yellow and Yangtze Rivers,providing valuable insights for global PAEs research in other major rivers.

关键词： Phthalates Spatial variation Potential sources Risk assessment

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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 constituent 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 comprehensively evaluated the water quality of SSW by comparing 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 coagulation-sedimentation process for SSW *** levels of most water quality parameters were generally comparable between SSW and *** the pre-sedimentation of SSW,significant removal of turbidity,bacterial counts,and dissolved organic matter(DOM)was *** characterization of DOM components,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/coagulation capacities in aluminum residuals of SSW,underscoring its potential as a coagulant and promoting the generation and sedimentation of inorganic-organic *** coagulation-sedimentation process could effectively remove pollutants from low-turbidity SSW([turbidity]0water 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 Coagulation-sedimentation

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Stable partial nitrification was achieved for nitrogen removal from municipal wastewater by gel immobilization:A pilot-scale study

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Journal of Environmental sciences 2025年第5期151卷 529-539页

作者： Xin Hu Hong Yang Xiaoyue Fang Xuyan Liu Jiawei Wang Xiaotong Wang Yongsheng Bai Bojun Su Key Laboratory of Beijing for water Quality science and water Environmental Recovery Engineering Faculty of ArchitectureCivil and Transportation EngineeringBeijing University of TechnologyBeijing 100124China Beijing General Municipal Engineering Design&Research Institute Co. Ltd.Beijing 100044China Hebei GEO University Shijiazhuang 050031China Hebei Key Laboratory of water Quality Engineering and Comprehensive Utilization of water Resources Hebei University of ArchitectureZhangjiakou 075000China School of Environmental science and Safety Engineering Tianjin University of TechnologyTianjin 300384China Beijing Drainage Group Co.Ltd. Beijing 100022China

As an energy and carbon saving process for nitrogen removal from wastewater,the partial nitrification and denitrification process(PN/D)has been extensively ***,achieving stable PNinmunicipalwastewater has always been *** this study,a gel immobilized PN/D nitrogen removal process(GI-PN/D)was established.A 94 days pilot-scale experiment was conducted using real municipal wastewater with an ammonia concentration of 43.5±5.3mg N/L at a temperature range of 11.3–28.7◦*** nitrogen removal performance and associated pathways,shifts in the microbial community as well as sludge yield were *** results were as follows:the effluent TN and COD were 0.6±0.4mg/L and 31.1±3.8 mg/L respectively,and the NAR exceeding 95%.GI-PN/D achieved deep nitrogen removal ofmunicipalwastewater through stable PN without taking any *** primary pathways for nitrogen removal were identified as denitrification,simultaneous nitrification-denitrification,and aerobic ***-throughput sequencing analysis revealed that the immobilized fillers facilitated the autonomous enrichment of functional bacteria in each reactor,effectively promoting the dominance and stability of the microbial *** addition,GI-PN/D had the characteristic of low sludge yield,with an average sludge yield of 0.029 kg SS/kg *** study provides an effective technical for nitrogen removal from municipal wastewater through PN.

关键词： Gel immobilization Partial nitrification Deep nitrogen removal Autonomous enrichment Sludge yield

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Deciphering environmental factors influencing phytoplankton community structure in a polluted urban river

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Journal of Environmental sciences 2025年第2期148卷 375-386页

作者： Xiaxia Li Kai Chen Chao Wang Tianyu Zhuo Hongtao Li Yong Wu Xiaohui Lei Ming Li Bin Chen Beibei Chai School of water Conservancy and Hydroelectric Power Hebei University of EngineeringHandan 056038China Collaborative Innovation Center for Intelligent Regulation and Comprehensive Management of water Resources School of Water Conservancy and HydroelectricHebei University of EngineeringHandan 056038China Hebei Key Laboratory of Intelligent water Conservancy Hebei University of EngineeringHandan 056038China Tianjin water Group Binhai water Co. Ltd.Tianjin 300308China State Key Laboratory of Simulation and Regulation of water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 100038China School of Architecture and Civil Engineering Xi’an University of Science and TechnologyXi’an 710054China Chengdu University of Technology Chengdu 610059China College of Natural Resources and Environment Northwest A&F UniversityYangling 712100China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing 100875China

Tuojiang River Basin is a first-class tributary of the upper reaches of the Yangtze River—which is the longest river in *** phytoplankton are sensitive indicators of trophic changes inwater bodies,characterizing phytoplankton communities and their growth influencing factors in polluted urban rivers can provide new ideas for pollution ***,we used direct microscopic count and environmental DNA(eDNA)metabarcoding methods to investigate phytoplankton community structure in Tuojiang River Basin(Chengdu,Sichuan Province,China).The association between phytoplankton community structure and water environmental factors was evaluated by Mantel *** environmental monitoring data were used to pinpoint major factors that influenced phytoplankton growth based on structural equation *** the phylum level,the dominant phytoplankton taxa identified by the conventional microscopic method mainly belonged to Bacillariophyta,Chlorophyta,and Cyanophyta,in contrast with Chlorophyta,Dinophyceae,and Bacillariophyta identified by eDNA ***α-diversity analysis,eDNA metabarcoding detected greater species diversity and achieved higher precision than the microscopic *** growth was largely limited by phosphorus based on the nitrogen-to-phosphorus ratios>16:1 in all water *** analysis and structural equation modeling also confirmed that the nitrogen-to-phosphorus ratio was the principal factor influencing phytoplankton *** results could be useful for implementing comprehensive management of the river basin *** is recommended to control the discharge of point-and surface-source pollutants and the concentration of dissolved oxygen in areas with excessive nutrients(e.g.,Jianyang-Ziyang).Algae monitoring techniques and removal strategies should be improved in 201 Hospital,Hongrihe Bridge and Colmar Town areas.

关键词： Environmental DNA Microscopic count Phytoplankton growth Structural equation modeling Tuojiang River Basin

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Changes in River Cross-section Morphology and Response to Streamflow and Sediment Processes in Middle Reaches of Yellow River,China

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Chinese Geographical science 2025年第1期35卷 161-174页

作者： WEN Yongfu LI Pengfei LI Mengzhen MA Chaohui GAO Peng MU Xingmin ZHAO Guangju The Research Center of Soil and water Conservation and Ecological Environment Chinese Academy of Sciences and Ministry of EducationYangling 712100China Institute of Soil and water Conservation Chinese Academy of Sciences&Ministry of Water ResourcesYangling 712100China University of Chinese Academy of sciences Beijing 100049China Hebei University of water Resources and Electric Engineering Cangzhou 061001China Xi’an University of science and Technology Xi’an 710054China Institute of Soil and water Conservation Northwest A&F UniversityYangling 712100China

Changes in river cross-section morphology have decisive influences on the flood discharge and sand transport capacity of rivers;thus,these changes strongly reflect the vitality of a *** this paper,based on the river cross-section and water and sediment data of two different periods(1974−1987 and 2007−2021),the trend analysis,change-point analysis and sediment rating curve method were used to analyze the change process of river cross-section morphology and its response to streamflow and sediment changes in the main river stream of the Yellow River at the Longmen hydrological *** 1974 to 1987(except in 1977),the riverbed experi-enced siltation,and the riverbed elevation ***,from 2007 to 2021,the riverbed experienced scouring,and the riverbed el-evation gradually *** cross-section shape changed from rectangular to U-shaped(deeper on the right side)at the Longmen *** changes in streamflow and sediment processes significantly impacted the evolution of river ***-flow(Pwater depth and sediment load coefficients followed a power *** decreasing trend in sediment discharge was sig-nificantly stronger than that in *** sediment particles tended to become *** sediment rating curve indicates that the sediment supply from upstream decreased while the erosive power in the river channel increased,leading to a gradual decline in riverbed elevation at the Longmen cross-section from 2007 to *** findings help us better understand the impacts of ecological restoration on changes in river streamflow and sediment during river evolution.

关键词： cross-section shape riverbed elevation water depth streamflow sediment discharge eco-restoration Longmen station middle reaches of the Yellow River,China

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Disentangling the contributing components of stream water by using environmental tracers

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Journal of Mountain science 2025年第1期22卷 260-277页

作者： Abul Amir KHAN Naresh Chandra PANT Amity centre for Air Pollution Control(ACAPC)&Amity centre for Ocean Atmospheric science and Technology(ACOAST) Amity University Haryana(AUH)Gurugram-122413India Department of Geology University of DelhiNorth CampusDelhi-11007India

Identifying the various components contributing to river discharge can be *** study relies on stable isotopes and electrical conductivity(EC)of water as tracers to distinguish the different components contributing to total river ***,we have made an effort to comprehend the processes that may influence glacier ice melt as well as the limits of oxygen-based hydrograph *** distinct geographic domains in terms of climates and topographies were *** first study site represents the upper Ganga catchment(central Himalaya),while the second site is located in the Chandra sub-basin in western *** in estimating the proportion of glacier melt in isotope mixing model are likely if end-member isotopic compositions,are not well defined,particularly for *** separation results indicate that snowmelt is the largest contributor to total river flow in both *** contribution of snowmelt to the total runoff of the upper Ganga ranged from~60%to 70%.The estimated contributions of glacier melt varied from 36%to 63%in upper Ganga headwater to 6%to 15%at Devprayag and~8%at *** the Hamtah River,glacier and snowmelt contributions,quantified using a two-component mixing model,ranged from 10%to 14%during the pre-and postmonsoon seasons of *** significant spatial and temporal variability,coupled with overlapping isotopic signatures,suggests complex glacio-fluvial interactions in these *** slow-moving air masses with whirling motion closer to the study area irrespective of the direction,and air parcels coming through Bay of Bengal branch are characterized by depleted isotopic rainfall compared to air masses originating from the Arabian Sea.

关键词： Snowmelt Glacier melt Oxygen isotopes Bhagirathi River Alaknanda River Hamtah

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Enhancing microbial superoxide generation and conversion to hydroxyl radicals for enhanced bioremediation using iron-binding ligands

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Journal of Environmental sciences 2025年第1期147卷 597-606页

作者： Yuhan Wang Xue Ning Jinsong Liang Aijie Wang Jiuhui Qu School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhen 518055China SFI MaREI centre for Energy Climate and MarineEnvironmental Research InstituteUniversity College CorkCorkIreland Center for water and Ecology Tsinghua UniversityBeijing 100084China

Harnessing bacteria for superoxide production in bioremediation holds immense promise,yet its practical application is hindered by slow production rates and the relatively weak redox potential of *** study delves into a cost-effective approach to amplify superoxide production using an Arthrobacter strain,a prevalent soil bacterial *** research reveals that introducing a carbon source along with specific iron-binding ligands,including deferoxamine(DFO),diethylenetriamine pentaacetate(DTPA),citrate,and oxalate,robustly augments microbial superoxide ***,our findings suggest that these iron-binding ligands play a pivotal role in converting superoxide into hydroxyl radicals by modulating the electron transfer rate between Fe(Ⅲ)/Fe(Ⅱ)and ***,among the tested ligands,only DTPA emerges as a potent promoter of this conversion process when complexed with Fe(Ⅲ).We identify an optimal Fe(Ⅲ)to DTPA ratio of approximately 1:1 for enhancing hydroxyl radical production within the Arthrobacter *** research underscores the efficacy of simultaneously introducing carbon sources and DTPA in facilitating superoxide production and its subsequent conversion to hydroxyl radicals,significantly elevating bioremediation ***,our study reveals that DTPA augments superoxide production in cultures of diverse soils,with various soil microorganisms beyond Arthrobacter identified as contributors to superoxide *** emphasizes the universal applicability of DTPA across multiple bacterial *** conclusion,our study introduces a promising methodology for enhancing microbial superoxide production and its conversion into hydroxyl *** findings hold substantial implications for the deployment of microbial reactive oxygen species in bioremediation,offering innovative solutions for addressing environmental contamination challenges.

关键词： Superoxide Hydroxyl radical Iron-binding ligand Bioremediation DTPA

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Discrete Numerical Study on Type II Fracture of Partially Detached Concrete Panels in Cold Region

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Structural Durability & Health Monitoring 2025年第1期19卷 167-191页

作者： Huayi Zhang Maobin Song Lei Shen Nizar Faisal Alkayem Maosen Cao College of water Conservancy and Hydropower Engineering Hohai UniversityNanjing210024China Haihe River Huaihe River and Xiaoqinghe River Basin Water Conservancy Management and Service Center of Shandong ProvinceJinan250100China College of Mechanics and Engineering science Hohai UniversityNanjing211100China

When the upper chord beam of the beam-string structure(BSS)is made of concrete-ﬁlled steel tube(CFST),its overall stiffness will change greatly with the construction of concrete placement,which will have an impact on the design of the tensioning plans and selection of control measures for the *** order to accurately obtain the bending stiffness of CFST beam and clarify its impact on the mechanical properties of composite BSS during con-struction,the inﬂuence of some factors such as height-width ratio,wall thickness of steel tube,elasticity modulus of concrete,and friction coefﬁcient on the bending stiffness are analyzed parametrically by the numerical simula-tion technology based on an actual *** calculation formula of the equivalent bending stiffness of CFST is also established through mathematical statistical ***,the equivalent bending stiffness is introduced into the construction and use stages of the composite BSS,respectively,and the mechanical properties such as prestress-tensioning control value,structural deformation,and internal force of key members are comparatively analyzed when adopting two different construction ***,the optimal construction plan of concrete placementﬁrst and then prestress-tensioning is proposed.

关键词： Beam-string structure(BSS) concrete-ﬁlled steel tube(CFST) bending stiffness timing of concrete placement prestress-tensioning

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