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Journal of Environmental Sciences 2019年第6期31卷 229-239页

作者： Hexi Zhou Guoren Xu State Key laboratory of Urban Water Resource and Environment Harbin Institute of Technology national engineering laboratory for sustainable sludge management & resourcelization technology Harbin Institute of Technology

The effects of silver nanoparticles(AgNPs) on reactor performance, extracellular polymeric substances composition and microbial community structure and function in integrated fixed-film activated sludge–sequencing batch reactors(IFAS–SBRs) were *** showed that the addition of AgNPs from 0.1 to 10 mg/L exhibited no significant effects on nutrient removal. The average overall removal of COD, NH4+–N and PO43-–P was96.6%, 99.9% and 98.8%, respectively. The introduction of AgNPs caused an increase in extracellular polymeric substances content for the sludge and biofilm of IFAS–SBRs. The release of Ag+from Ag NPs and lactate dehydrogenase test implied the low toxicity of AgNPs to IFAS–SBRs. High-throughput sequencing revealed that microbial community structure showed significant shifts at phylum and genus levels after long-term exposure to AgNPs,but core functional groups responsible for nutrient removal remained at high *** function prediction indicated that the metabolic categories showed no significant shifts under AgNPs stress, therefore good process performance could still be achieved.

关键词： AgNPs Performance Toxicity Community structure IFAS-SBR

The nitritation performance of biofilm reactor for treating domestic wastewater under high dissolved oxygen

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Journal of Environmental Sciences 2016年第4期28卷 267-274页

作者： Zhaoming Zheng Zebing Li Jing Ma Jia Du Guanghui Chen Wei Bian Jun Li Baihang Zhao Key laboratory of Beijing for Water Quality Science and Water Environment Recovery engineering Beijing University of Technology School of Water Resources and Environmental engineering East China Institute of Technology

The objective of this study was to investigate the nitritation performance in a biofilm reactor for treating domestic *** reactor was operated in continuous feed mode from phases 1 to *** dissolved oxygen（DO）was controlled at 3.5–7 mg/L throughout the *** biofilm reactor showed excellent nitritation performance after the inoculation of nitrifying sludge,with the hydraulic retention time being reduced from 24 to 7 *** 90%nitrite accumulation ratio（NAR）was maintained in phase ***,nitratation occurred with the low NH4^＋–N concentration in the *** improvement of NH4^＋–N concentration to 20–35 mg/L had a limited effect on the recovery of ***,nitritation recovered rapidly when sequencing batch feed mode was adopted in phase 4,with the effluent NH4^＋-N concentration above 7 mg/*** improvement of ammonia oxidizing bacteria（AOB）activity and the combined inhibition effect of free ammonia（FA）and free nitrous acid（FNA）on the nitrite oxidizing bacteria（NOB）were two key factors for the rapid recovery of *** activity was obtained in batch *** results of batch tests had a good relationship with the long term operation performance of the biofilm reactor.

关键词： Nitritation High dissolved oxygen Domestic wastewater Biofilm reactor Control measures

Unraveling natural aging-induced properties change of sludge-derived hydrochar and enhanced cadmium sorption site heterogeneity

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Biochar 2022年第1期4卷 615-634页

作者： Bingyu Wang Cenyao Shang Huifang Xie Haijun Sun Qiang Zhang Lihong Xue Filip M.G.Tack Deyi Hou Yanfang Feng Jörg Rinklebe Jiangsu Key laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China Key laboratory of Agro-Environment in Downstream of Yangtze Plain National Agricultural Experiment Station for Agricultural EnvironmentMinistry of Agriculture and Rural AffairsInstitute of Agricultural Resources and EnvironmentJiangsu Academy of Agricultural SciencesNanjing 210014China Co-Innovation Center for sustainable Forestry in Southern China College of ForestryNanjing Forestry UniversityNanjing 210037China Department of Green Chemistry and technology Ghent University9052 GhentBelgium School of Environment Tsinghua UniversityBeijing 100084China School of Architecture and Civil engineering Institute of Foundation EngineeringWaterand Waste-ManagementLaboratory of Soiland Groundwater-ManagementUniversity of WuppertalPauluskirchstraße 742285 WuppertalGermany

Hydrochar has potential applications in soil improvement and heavy metal *** would undergo the process of aging when introduced into the soil,altering its ***,recent studies have focused mainly on the artificial aging of hydrochar,which could not reveal the cumulative effect of multiple environmental ***,the periodical monitoring of the property and sorption behavior of hydrochar after amending soils is necessary to better understand the multifaceted mechanisms associated with the natural aging of *** study selected the sludge-derived hydrochar(SLHC)as a typical hydrochar and applied a 16-month rice-wheat-rice rotation to mimic the natural aging of hydrochar,focusing on changing properties and cadmium(Cd)sorption and literature contrast between aging strategies and biochar *** porosity,O abundance,and ash content of 16-month aged SLHC increased by 37%,47%,and 8.5%,respectively,facilitating Cd sorption due to surface complexation,pore sorption,and *** sorption percentage of Cd to SLHC was in the range of 11-14%for SLHC-A0 and increased to 17-31%for SLHC-A4 and 20-32%for SLHC-A16 after natural *** natural aging of SLHC induced by ash content played an essential role in Cd sorption site *** regression analysis showed that aging strategies on sorption behavior significantly differed between ***,studies involving natural aging with multiple environmental factors are preferred over those involving chemical or biological *** studies should continue to explore the mechanisms of natural aging-induced heavy metal sorption between hydrochar and *** results improve insights to appraise the potential of SLHC as soil amendments to alleviate the adverse effects of heavy metal contamination and provide an essential basis for researchers and staff in soil management and environmental prevention.

关键词： sludge-derived hydrochar Hydrothermal carbonization Natural aging Physicochemical properties Sorption behavior Cadmium

Improving sludge dewaterability via Fe^(2+) chelated citrate activated peroxydisulfate oxidation

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Journal of Environmental Sciences 2023年第3期125卷 223-233页

作者： Donghai Yuan Xinyu Li Siyu Xiong Jun Cui Jijiao Zhou Yingying Kou Key laboratory of Urban Stormwater System and Water Environment Ministry of EducationBeijing University of Civil Engineering and ArchitectureBeijing 100044China Department of Environmental Science and engineering Beijing University of Chemical TechnologyBeijing 100029China Huzhou Environmental Sanitation management Center Huzhou 313000China

Citrate (Ct) was chosen as a typical chelator used in the Fe^(2+)-peroxydisulfate (PDS) process to improve sludge *** PDS-Fe^(2+)-Ct process exhibited better performance in sludge dewatering than PDS-Fe^(2+).Specifically,with a PDS dosage of 1.2 mmol/g VS,the molar ratio of PDS/Fe^(2+)and Ct/Fe^(2+)were 4:5 and 1:4,respectively,the capillary suction time decreased from 155.8 to 24.8sec,and the sludge cake water content decreased from 82.62%to 64.11%(-0.06MPa).The oxidation led to a reduced negative charge and a decrease in particle *** enhanced sludge dewaterability and changes of sludge properties were attributed to the decomposition of extracellular polymeric substances,and it was explored by protein,polysaccharide,3D-EEMs,and ***,the quenching experiments of radical species demonstrated that SO_(4)-·played a more important role than·OH,and its productivity was improved with the addition of ***,the reasons for the improved productivity of radicals with the addition of Ct were *** results of this study could serve as a basis for improving sludge dewatering using the PDS-Fe^(2+)-Ct process and suggest that the addition of Ct may improve the productivity of SO_(4)-·in the activation o PDS via Fe^(2+).

关键词： Wastewater sludge Dewaterability Peroxydisulfate oxidation Citrate

Practical consideration for design and optimization of the step feed process

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Frontiers of Environmental Science & engineering 2013年第1期7卷 135-142页

作者： Shijian GE Yongzhen PENG Congcong LU Shuying WANG College of Environmental and Energy engineering Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering Beijing University of Technology Beijing 100124 China

Based on the anoxic/oxic (A/O) step feed process, a modified University of Cape Town (UCT) step feed process was developed by adding an anaerobic zone and adjusting sludge return pipeline. Performance evaluation of these two types of processes was investigated by optimizing operational parameters, such as the anaerobic/anoxic/oxic volumes, internal recycle ratios, and sludge retention times, for removal of chemical oxygen demanding (COD), nitrogen, and phosphorus. Results showed high removal efficiencies of COD of (85.0±1.7)%, ammonium of (99.7±0.2)%, total nitrogen (TN) of (85.5±1.7)%, phosphorus of (95.1±3.3)%, as well as excellent sludge settleability with average sludge volume index of (83.7±9.5) L·mg?1 in the modified UCT process. Moreover, (61.5±6.0)% of influent COD was efficiently involved in denitrification or phosphorus release process. As much as 35.3% of TN was eliminated through simultaneous nitrification and denitrification process in aerobic zones. In addition, the presence of denitrifying phosphorus accumulating organisms (DNPAOs), accounting for approximately 39.2% of PAOs, was also greatly beneficial to the nitrogen and phosphorus removal. Consequently, the modified UCT step feed process was more attractive for the wastewater treatment plant, because it had extremely competitive advantages such as higher nutrient removal efficiencies, lower energy and dosages consumption, excellent settling sludge and operational assurance.

关键词： step feed anoxic/oxic (A/O) University of Cape Town (UCT) simultaneous nitrification and denitrification (SND) denitrifying phosphorus removal biological nutrient removal (BNR)

New insight into adsorption characteristics and mechanisms of the biosorbent from waste activated sludge for heavy metals

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Journal of Environmental Sciences 2016年第7期28卷 248-256页

作者： Yun Zhou Zhiqiang Zhang Jiao Zhang Siqing Xia Key laboratory of Yangtze River Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University State Key laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Swette Center for Environmental Biotechnology Arizona State University School of Civil engineering and Transportation Shanghai Technical College of Urban Management

The adsorption characteristics and mechanisms of the biosorbent from waste activated sludge were investigated by adsorbing Pb2＋and Zn2＋in aqueous single-metal solutions. A p H value of the metal solutions at 6.0 was beneficial to the high adsorption quantity of the biosorbent. The optimal mass ratio of the biosorbent to metal ions was found to be 2. A higher adsorption quantity of the biosorbent was achieved by keeping the reaction temperature below 55°C. Response surface methodology was applied to optimize the biosorption processes, and the developed mathematical equations showed high determination coefficients（above 0.99 for both metal ions） and insignificant lack of fit（p = 0.0838 and 0.0782 for Pb2＋and Zn2＋, respectively）. Atomic force microscopy analyses suggested that the metal elements were adsorbed onto the biosorbent surface via electrostatic interaction. X-ray photoelectron spectroscopy analyses indicated the presence of complexation（between –NH2,-CN and metal ions） and ion-exchange（between –COOH and metal ions）. The adsorption mechanisms could be the combined action of electrostatic interaction, complexation and ion-exchange between functional groups and metal ions.

关键词： Waste activated sludge Biosorbent Adsorption Metal ions Response surface methodology(RSM)

Stability of potentially toxic elements in municipal sludge biochars modified by MgCl2 and phosphate

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Waste Disposal and sustainable Energy 2023年第1期5卷 13-23页

作者： Qiqi Huang Siqi Chen Jinhao Lin Jingzi Beiyuan Jin Wang Juan Liu Yundang Wu Xiaolian Wu Fuhua Li Wenbing Yuan Chengrong Nie School of Environmental and Chemical engineering Foshan UniversityFoshan528000China School of Food Science and technology Foshan UniversityFoshan528000China Foshan engineering and technology Research Center for Contaminated Soil Remediation School of Environmental and Chemical EngineeringFoshan UniversityFoshan528000China School of Environmental Science and engineering Key Laboratory of Water Quality and Conservation in the Pearl River DeltaMinistry of EducationGuangzhou UniversityGuangzhou510006China Guangdong Key laboratory of Integrated Agro-Environmental Pollution Control and management Institute of Eco-Environmental and Soil SciencesGuangdong Academy of SciencesNational-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South ChinaGuangzhou510650China

Municipal wastewater sludge can be pyrolyzed as biochars to better use nutrients and stabilize carbon compared with other typical technologies,such as landfill and ***,sludge-derived biochars might contain large amounts of potentially toxic elements(PTEs),such as Zn,Cu,Cr,Ni,Pb,and *** stability of PTEs in biochars might be improved by higher pyrolytic temperatures,which can be further improved by different ***,PO4-modification at 300°C and Cl-modification at 700°C were carried out,respectively,to enhance the stability of *** leaching tests have been performed to assess the stability of PTEs in biochars,including the synthetic precipitation leaching procedure(SPLP),toxicity characteristic leaching procedure(TCLP),diethylenetriamine pentaacetate(DTPA)extraction,and in vitro simple bioaccessibility extraction test(SBET).The morphological structure,elemental mapping,and mineral formation of the pristine and modified biochars were studied by scanning electron microscopy–energy-dispersive X-ray spectroscopy(SEM–EDS)and X-ray diffraction(XRD).Our results suggested that the leachability,mobility,plant-availability,and bioaccessibility of most PTEs were decreased by pyrolysis,yet the total contents of PTEs were elevated,especially at 700°***,modification by phosphates and MgCl2 enhanced the stability of PTEs in ***,it should be noted that higher bioaccessibility of PTEs was observed in biochars of P-modification than Cl-modification,which is associated with the dissolution of phosphate precipitates under acidic conditions(pH<2).Additionally,Cl-modification leads to higher plant-available Zn and Cu and bioaccessible Zn compared with the unmodified biochar produced at 700°C.

关键词： Biochar modification sludge biochar Sewage sludge utilization Chlorination Pyrolysis Heavy metals

Potential acute effects of suspended aluminum nitride (AlN) nanoparticles on soluble microbial products (SMP) of activated sludge

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Journal of Environmental Sciences 2017年第7期29卷 284-292页

作者： Lijie Zhou Weiqin Zhuang Xin Wang Ke Yu Shufang Yang Siqing Xia State Environmental Protection Key laboratory of Drinking Water Source management and technology Shenzhen Key Laboratory of Drinking Water Source Safety ControlShenzhen Key Laboratory of Emerging Contaminants Detection & Control in Water EnvironmentShenzhen Academy of Environmental Sciences State Key laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji University Department of Civil and Environmental engineering University of Auckland School of Environment and Energy Peking University Shenzhen Graduate School Shenzhen Municipal Design & Research Institute Co. Ltd

The study aims to identify the potential acute effects of suspended aluminum nitride（Al N）nanoparticles（NPs） on soluble microbial products（SMP） of activated *** activated sludge loaded with 1,10,50,100,150 and 200 mg/L of Al N NPs were carried out in this *** results showed,Al N NPs had a highly inverse proportionality to bacterial dehydrogenase and OUR,indicating its direct toxicity to the activated sludge *** toxicity of Al N NPs was mainly due to the nano-scale of Al N *** SMP,Al N NPs led to the decrease of polysaccharide and humic compounds,but had slight effects on *** decrease of tryptophan-like substances in SMP indicated the inhibition of Al N NPs on the bacterial ***,Al N NPs reduced obviously the molecular weight of SMP,which might be due to the nano-scale of Al N.

关键词： Aluminum nitride nanoparticles Topic Soluble microbial products(SMP) Activated sludge Bacterial viability

Effects of persulfate-assisted hydrothermal treatment of municipal sludge on aqueous phase characteristics and phytotoxicity

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Journal of Environmental Sciences 2023年第4期126卷 163-173页

作者： Guangchun Shan Weiguang Li Yujie Zhou Shanshan Bao Lin Zhu Wenbing Tan State Key laboratory of Environmental Criteria and Risk Assessment and State Environmental Protection Key Laboratory of Simulation and Control of Groundwater PollutionChinese Research Academy of Environmental SciencesBeijing 100012China State Key laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China Key laboratory of Water management and Water Security for Yellow River Basin of Ministry of Water Resources(Under Construction) Yellow River Engineering Consulting Co.LtdZhengzhou 450003China

Hydrothermal technology (HT) has received much attention in recent years as a process to convert wet organic waste into *** aqueous phase (HTAP) produced by this process is still a burden and has become a bottleneck issue for HT process *** this study,we provide the?rst investigation of the HTAP characteristics,phytotoxicity,and their correlation with persulfate (PS)(PS,2.0 mmol/g TS)-assisted municipal sludge *** results showed that PS accelerated the hydrolysis of protein substances and increased the concentration of NH_(4)^(+)by 13.4%to 190.5%and that of PO_(4)^(3-)by 24.2%to 1103.7%in HTAP at hydrothermal temperatures of 120 to 240℃.PS can reduce the phytotoxicity of HTAP by reducing aldehydes,ketones,N heterocyclic compounds,and particle size and by increasing its humi?cation *** maximum values of the root length and biomass of pakchoi(Brassica chinensis L.) seedlings occurred when electrical conductivity was 0.2 mS/cm of *** work provided a new strategy for the selection and design of HTAP management strategies.

关键词： Hydrothermal technology Aqueous phase characteristics Pakchoi Seedlings Phytotoxicity

Overview of key operation factors and strategies for improving fermentative volatile fatty acid production and product regulation from sewage sludge

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Journal of Environmental Sciences 2020年第1期32卷 93-111页

作者： Wei Fang Xuedong Zhang Panyue Zhang Jijun Wan Hongxiao Guo Dara S.M.Ghasimi Xavier Carol Morera Tao Zhang State Key laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China School of Environmental Science and engineering Beijing Forestry UniversityBeijing 100083China Department of Water management Section Sanitary EngineeringDelft University of TechnologyPO Box 50482600 GA Delftthe Netherlands Department of Civil engineering University of Kurdistan HewlerErbilKurdistan RegionIraq Institut Quimic de Sarria Uniuersitat Ramon LlullVia Augusta 390E-08017 BarcelonaSpain Key laboratory of Northwest Water Resource Environment and EcologyMOEXi'an University of Architecture and TechnologyXi'an 710055China

In recent years,volatile fatty acid(VFA)production through anaerobic fermentation of sewage sludge,instead of methane production,has been regarded as a high-value and promising roadmap for sludge stabilization and resource *** review first presents the effects of some essential factors that influence VFA production and *** the second part,we present an extensive analysis of conventional pretreatment and co-fermentation strategies ultimately addressed to improving VFA production and ***,the effectiveness of these approaches is summarized in terms of sludge degradation,hydrolysis rate,and VFA production and *** to published studies,it is concluded that some pretreatments such as alkaline and thermal pretreatment are the most effective ways to enhance VFA production from sewage *** possible reasons for the improvement of VFA production by different methods are also ***,this review also highlights several current technical challenges and opportunities in VFA production with spectrum control,and further related research is proposed.

关键词： Sewage sludge Anaerobic digestion VFA production Pretreatment Co-fermentation