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Arsenic removal from groundwater by acclimated sludge under autohydrogenotrophic conditions

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Journal of Environmental Sciences 2014年第2期26卷 248-255页

作者： Siqing Xia Shuang Shen Xiaoyin Xu Jun Liang lijie zhou State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University

Arsenic in the environment is attracting increasing attention due to its chronic health effects. Although arsenite （As（III）） is generally more mobile and more toxic than arsenate （As（V））, reducing As（V） to As（III） may still be a means for decontamination, because As（III） can be removed from solution by precipitation with sulfide or by adsorption or complexation with other metal sulfides. The performance of As（V） bio-reduction under autohydrogenotrophic conditions was investigated with batch experiments. The results showed that As（V） reduction was a biochemical process while both acclimated sludge and hydrogen were essential. Most of the reduced arsenic remained in a soluble form, although 20% was removed with no addition of sulfate, while 82% was removed when sulfate was reduced to sulfide. The results demonstrated that the reduced arsenic was re-sequestered in the precipitates, probably as arsenic sulfides. Kinetic analysis showed that pseudo first-order kinetics described the bio-reduction process better than pseudo second-order. In particular, the influences of pH and temperature on As（V） reduction by acclimated sludge under autohydrogenotrophic conditions and total soluble As removal were examined. The reduction process was highly sensitive to both pH and temperature, with the optimum ranges of pH 6.5-7.0 and 30-40℃ respectively. Furthermore, Arrhenius modeling results for the temperature effect indicated that the As（V） reduction trend was systematic. Total soluble As removal was consistent with the trend of As（V） reduction.

关键词： arsenic autohydrogenotrophic bio-reduction hydrogen groundwater

Technology for recycling and regenerating graphite from spent lithium-ion batteries

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Chinese Journal of Chemical Engineering 2021年第11期34卷 37-50页

作者： Chenxing Yi lijie zhou Xiqing Wu Wei Sun Longsheng Yi Yue Yang School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Beijing Battery Green Resources Technology Co. LtdBeijing 100081China

With the annual increase in the amount of lithium-ion batteries(LIBs),the development of spent LIBs recycling technology has gradually attracted *** is one of the most critical materials for LIBs,which is listed as a key energy source by many developed ***,it was neglected in spent LIBs recycling,leading to pollution of the environment and waste of *** this paper,the latest research progress for recycling of graphite from spent LIBs was ***,the processes of pretreatment,graphite enrichment and purification,and materials regeneration for graphite recovery are introduced in ***,the problems and opportunities of graphite recycling are raised.

关键词： Spent lithium-ion batteries Graphite Anode materials Recycle

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

Bioreduction of vanadium(V) in groundwater by autohydrogentrophic bacteria:Mechanisms and microorganisms

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Journal of Environmental Sciences 2015年第4期27卷 122-128页

作者： Xiaoyin Xu Siqing Xia lijie zhou Zhiqiang Zhang Bruce E.Rittmann State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Swette Center for Environmental Biotechnology Biodesign Institute at Arizona State University Key Laboratory of Yangtze River Water Environment Ministry of Education College of Environmental Science and EngineeringTongji University

As one of the transition metals, vanadium（V）（V（V）） in trace amounts represents an essential element for normal cell growth, but becomes toxic when its concentration is above 1 mg/L. V（V） can alter cellular differentiation, gene expression, and other biochemical and metabolic phenomena. A feasible method to detoxify V（V） is to reduce it to V（IV）, which precipitates and can be readily removed from the water. The bioreduction of V（V） in a contaminated groundwater was investigated using autohydrogentrophic bacteria and hydrogen gas as the electron donor. Compared with the previous organic donors,H2 shows the advantages as an ideal electron donor, including nontoxicity and less production of excess biomass. V（V） was 95.5% removed by biochemical reduction when autohydrogentrophic bacteria and hydrogen were both present, and the reduced V（IV）precipitated, leading to total-V removal. Reduction kinetics could be described by a first-order model and were sensitive to p H and temperature, with the optimum ranges of p H 7.5–8.0 and 35–40°C, respectively. Phylogenetic analysis by clone library showed that the dominant species in the experiments with V（V） bioreduction belonged to theβ-Proteobacteria. Previously known V（V）-reducing species were absent, suggesting that V（V）reduction was carried out by novel species. Their selective enrichment during V（V）bioreduction suggests that Rhodocyclus, a denitrifying bacterium, and Clostridium, a fermenter known to carry out metal reduction, were responsible for V（V） bioreduction.

关键词： Vanadium Bioreduction Hydrogen Rhodocyclus Clostridium

Privacy-Preserving Prepayment Based Power Request and Trading in Smart Grid

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China Communications 2018年第4期15卷 14-27页

作者： Shaohua Li Xiang Zhang Kaiping Xue lijie zhou Hao Yue Department of Electronic Engineering and Information Science University of Science and Technology of China Hefei 230027 Chin Science and Technology on Communication Networks Laboratory Shijiazhuang Hebei 050081 China Department of Computer Science San Francisco State University San Francisco CA 94132 USA.

Demand response has been intensively studied in recent years. It can motivate customers to change their consumption patterns according to the dynamic(time-varying) electricity price, which is considered to be the most cost-effective and reliable solution for smoothing the demand curve. However, many existing schemes, based on users' demand request in each period, require users to consume their requested electricity exactly, which sometimes causes inconvenience and losses to the utility, because customers cannot always be able to consume the accurate electricity demand due to various personal reasons. In this paper, we tackle this problem in a novel approach. Instead of charging after consumption, we adopt the prepayment mechanism to implement power request. Furthermore, we propose a trading market running by the control center to cope with the users' dynamic demand. It is noteworthy that both users' original demand and trading records are protected against potential adversaries including the curious control center. Through the numerical simulation, we demonstrate that our scheme is highly efficient in both computation and communication.

关键词： Demand response power request smart grid prepayment privacy preserving.

Enhanced struvite recovery from wastewater using a novel cone-inserted fluidized bed reactor

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Journal of Environmental Sciences 2014年第4期26卷 765-774页

作者： Awoke Guadie Siqing Xia Wei Jiang lijie zhou Zhiqiang Zhang Slawomir W.Hermanowicz Xiaoyin Xu Shuang Shen UNEP-Tongji Institute of Environment for Sustainable Development 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 Key Laboratory of Yangtze River Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University Department of Civil and Environmental Engineering University of California

The feasibility of struvite recovery at low （12.5 mg/L） and high （120 mg[L） phosphorus concentrations was studied by constructing a novel fluidized bed reactor with cones （FBRwc） and without cones （FBRwoc）. The crystallization process was continuously operated for 133 days under different hydraulic retention times （HRT = 1-10 hr）, pH （7.5-10）, and molar ratios of Mg/P （0.75-1.75）, N/P （1-10） and Ca/Mg （0-2）. The optimum operating conditions of HRT, pH, Mg/P and N/P molar ratios were found to be 2 hr, 9, 1.25, and 7.5, respectively. Under these optimum conditions, the phosphorus precipitation efficiencies of FBRwc were 93% for low and 98% for high phosphorus influent; however, the efficiencies were 78% and 81% for FBRwoc, respectively. Due to crystal losses at each junction （17%-31%）, the crystal recovery efficiency of FBRwoc was relatively low （47%-65%） for both influent concentrations. However, the losses were minimal in FBRwc, which showed 75% and 92% crystal recovery for low and high phosphorus concentrations, respectively. At low calcium concentration, crystal chemical analysis showed the product to be pure struvite （〉 99%）. The scanning electron microscope and X-ray diffraction results further confirmed that the crystal recovered from FBRwc contained pure struvite, which could be considered a high quality fertilizer. Except HRT, all parameters （pH, Mg/P, N/P and Ca/Mg） were found to be influencing factors for FBRwc performance. Overall, inserting cones in each part of the reactor played a significant role in enhancing struvite recovery from a wide range of phosphorus-containing wastewater.

关键词： ftuidized bed reactor phosphorus recovery struvite wastewater

CmMYB3-like negatively regulates anthocyanin biosynthesis and flower color formation during the post-flowering stage in Chrysanthemum morifolium

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Horticultural Plant Journal 2024年第1期10卷 194-204页

作者： lijie zhou Shenhui Liu Yiguang Wang Yuxi Wang Aiping Song Jiafu Jiang Sumei Chen Zhiyong Guan Fadi Chen State Key Laboratory of Crop Genetics and Germplasm Enhancement The Key Laboratory of LandscapingMinistry of Agriculture and Rural AffairsCollege of HorticultureNanjing Agricultural UniversityNanjingJiangsu 210095China

Color fading caused by a decrease in anthocyanin accumulation during the post-flowering stage significantly affects postharvest quality of ***,the underlying mechanism by which anthocyanin accumulation decreases during the post-flowering stage still unclear,which greatly restricts design of molecular breeding in ***,a chrysanthemum SG7 R2R3 MYB transcription factor(TF),CmMYB3-like,was identified to have a function in regulating anthocyanin biosynthesis during the post-flowering *** real time PCR(qRT-PCR)assays showed that the expression of CmMYB3-like was gradually downregulated when anthocyanin content increased during the flowering stage and was significantly upregulated during the post-flowering *** transformation of chrysanthemum and dual-luciferase assays in *** leaves showed that CmMYB3-like suppressed anthocyanin accumulation by inhibiting the transcription of CmCHS and CmANS directly and that of CmF3H ***,overexpression or suppression of CmMYB3-like did not affect the biosynthesis of flavones or *** transformation of chrysanthemum revealed that the overexpression of CmMYB3-like inhibited anthocyanin accumulation,but its suppression prevented the decrease in anthocyanin accumulation during the post-flowering *** results revealed a crucial role of CmMYB3-like in regulating the color of petals during the post-flowering stage and provided a target gene for molecular design breeding to improve the postharvest quality of chrysanthemum.

关键词： Post-flowering stage Color fading Anthocyanins CmMYB3-like Chrysanthemum Molecular breeding

Enhancing biofilm formation in the hydrogen-based membrane biofilm reactor through bacterial Acyl-homoserine lactones

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Frontiers of Environmental Science & Engineering 2024年第11期18卷 145-157页

作者： Yuchao Chen Kun Dong Yiming Zhang Junjian Zheng Minmin Jiang Dunqiu Wang Xuehong Zhang Xiaowu Huang lijie zhou Haixiang Li College of Environmental Science and Engineering Guilin University of TechnologyGuilin 541006China College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China College of Life and Environmental Sciences Guilin University of Electronic TechnologyGuilin 541004China Department of Environmental Science and Engineering Guangdong Technion-Israel Institute of TechnologyShantou 515063China Guangdong Provincial Key Laboratory of Materials and Technologies for Energy Conversion Guangdong Technion-Israel Institute of TechnologyShantou 515063China

The slow growth rate of autotrophic bacteria and regulation of biofilm thickness are critical factors that limit the development of a hydrogen-based membrane biofilm reactor(H_(2)-MBfR).The acylhomoserine lactone(AHL)mediated quorum sensing(QS)system is a crucial mechanism regulating biofilm ***,the AHLs that promote biofilm formation in autotrophic denitrification systems and their underlying mechanisms,remain *** study explored the impact of AHLmediated QS signaling molecules on biofilm development in H_(2)-*** study revealed that C_(14)-HSL and C_(4)-HSL are potential signaling molecules that enhanced biofilm formation in long-term stable operating H_(2)-*** short-term experiments with C_(14)-HSL and C_(4)-HSL confirmed their ability to increase bacterial adhesion to carrier surfaces by promoting the production of extracellular polymeric substances(EPS).Functional gene annotation indicated that exogenous C_(14)-HSL and C_(4)-HSL increased the abundance of signal transduction(increased by 0.250%–0.375%),strengthening the inter bacterial QS response while enhancing cell motility(increased by 0.24%and 0.21%,respectively)and biological adhesion(increased by 0.044%and 0.020%,respectively),thereby accelerating the initial bacterial attachment to hollow fiber membranes and facilitating biofilm *** findings contribute to the understanding of microbial community interactions in H_(2)-MBfRs and provide novel approaches for biofilm management in wastewater treatment systems.

关键词： Hydrogen-based membrane biofilm reactor (H2-MBfR) Acyl-homoserine lactones(AHLs) Quorum sensing(QS)Biofilm enhancement

High-performance wearable bimetallic nanowire-assisted composite foams for efficient electromagnetic interference shielding,infrared stealth,and piezoresistive sensing

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Nano Research 2024年第7期17卷 6757-6765页

作者： Tianyi Hang lijie zhou Chenhui Xu Yiming Chen Jiahui Shen Jiajia Zheng Pingan Yang Xiping Li Heng Luo Guoxiu Tong Key Laboratory of Urban Rail Transit Intelligent Operation and Maintenance Technology and Equipment of Zhejiang Province College of EngineeringZhejiang Normal UniversityJinhua 321004China School of Automation Chongqing University of Posts and TelecommunicationsChongqing 400065China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China

With the accelerated development of modern detection and communication technology,the multifunctional wearable materials with excellent electromagnetic interference(EMI)shielding,infrared stealth,and human monitoring for improving military combat capability have received extensive *** this work,the lightweight melamine foam(MF)@silver nanowires(AgNWs)-iron nanowires(FeNWs)(AgFe-MF)was fabricated by a vacuum-assisted dip-coating *** to the porous structure and synergistic electrical and magnetic losses,this lightweight(0.115 g/cm^(3))composite foam with an ultra-low filler content(0.62 vol.%)exhibited an ideal EMI shielding efficiency of 38.4 *** the other hand,the AgFe-MF realized a powerful multifunctional *** surface saturation temperature of the AgFe-MF reached 94.2℃under a low applied voltage of 1.8 V and remained extremely fast heating and cooling response and terrific working stability,resulting in excellent infrared stealth and camouflage ***,taking virtues of the elastic porous conductive architecture,the AgFe-MF was utilized as a piezoresistive sensor exhibiting board compressive interval of 0–1.62 kPa(50%strain)with a good sensitivity of 0.57 kPa^(−1).This work will provide new ideas and insights for developing multifunctional wearable devices in the fields of EMI shielding,thermal management,and piezoresistive sensing.

关键词： metal nanowires porous foams electromagnetic interference shielding infrared stealth wearable sensors