Exoelectrogenic biofilms have received considerable attention for their ability to enhance electron transfer between contaminants and electrodes in bioelectrochemical systems.In this study,we constructed anaerobic-aerobic-coupled upflow bioelectrochemical reactors(AO-UBERs)with different voltage application modes,voltages and hydraulic retention times(HRTs).In addition,we evaluated their capacity to remove chloramphenicol(CAP).AO-UBER can effectively mineralize CAP and its metabolites through electrical stimulation when an appropriate voltage is applied.The CAP removal efficiencies were～81.1％±6.1％(intermittent voltage application mode)and 75.2％±4.6％(continuous voltage application mode)under 0.5 V supply voltage,which were～21.5％and 15.6％greater than those in the control system without voltage applied,respectively.The removal efficiency is mainly attributed to the anaerobic chamber.High-throughput sequencing combined with catabolic pathway analysis indicated that electrical stimulation selectively enriched Megasphaera,Janthinobacterium,Pseudomonas,Emticicia,Zoogloea,Cloacibacterium and Cetobacterium,which are capable of denitrification,dechlorination and benzene ring cleavage,respectively.This study shows that under the intermittent voltage application mode,AO-UBERs are highly promising for treating antibiotic-contaminated wastewater.

Yifan Liu;Qiongfang Zhang;Ainiwaer Sidike;Nuerla Ailijiang;Anwar Mamat;Guangxiao Zhang;Miao Pu;Wenhu Cheng;Zhengtao Pang

Key Laboratory of Oasis Ecology of Education Ministry,College of Ecology and Environment,Xinjiang University,Urumqi 830017,China;Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem,Ministry of Education,Urumqi 830017,China;School of Geographical Sciences,Xinjiang University,Urumqi 830017,China;School of Chemical Engineering and Technology,Xinjiang University,Urumqi 830017,China

环境科学与工程前沿

[1]Yifan Liu;Qiongfang Zhang;Ainiwaer Sidike;Nuerla Ailijiang;Anwar Mamat;Guangxiao Zhang;Miao Pu;Wenhu Cheng;Zhengtao Pang-.The impact of different voltage application modes on biodegradation of chloramphenicol and shift of microbial community structure)[J].环境科学与工程前沿,2022(11):53-64

Exoelectrogenic,upflow,UBERs,HRTs,UBER,Emticicia

impact,different,application,modes,biodegradation,chloramphenicol,shift,microbial,community,structure,biofilms,have,received,considerable,attention,their,ability,enhance,electron,transfer,between,contaminants,electrodes,bioelectrochemical,systems,In,this,study,constructed,anaerobic,coupled,reactors,AO,voltages,hydraulic,retention,times,addition,evaluated,capacity,remove,CAP,can,effectively,mineralize,its,metabolites,electrical,stimulation,when,appropriate,applied,removal,efficiencies,were,intermittent,continuous,under,supply,which,greater,than,those,control,without,respectively,efficiency,mainly,attributed,chamber,High,throughput,sequencing,combined,catabolic,pathway,analysis,indicated,that,selectively,enriched,Megasphaera,Janthinobacterium,Pseudomonas,Zoogloea,Cloacibacterium,Cetobacterium,are,capable,denitrification,dechlorination,benzene,ring,cleavage,This,shows,highly,promising,treating,antibiotic,contaminated,wastewater

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