Intermittent electrical stimulation removes mixed antibiotics and associated antibiotic resistance genes at low temperatures  

作　　者：Chaoyue He Nuerla Ailijiang Zaimire Abdusalam Yincang Cui Na Li Mei Wu Hailiang Chen Yiming Zhang 

机构地区：[1]Key Laboratory of Oasis Ecology of Education Ministry,College of Ecology and Environment,Xinjiang University,Urumqi,830017,PR China [2]Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem,Ministry of Education,Urumqi,830017,PR China [3]The Analysis and Testing Center of Xinjiang University,Urumqi,830017,Xinjiang,PR China

出　　处：《Emerging Contaminants》2024年第4期275-285,共11页新兴污染物(英文)

基　　金：supported by the National Natural Science Foundation of China[grant No.51968067];the Fundamental Research Funds for the Autonomous Region Universities[grant No.XJEDU2023P006];Graduate Education Innovation Program of Xinjiang Uygur Autonomous Region of China[grant No.XJ2023G094];Special fund project for central guidance of local scientific and technological development[grant No.ZYYD2023A04];State Key Joint Laboratory of Environment Simulation and Pollution Control[grant No.22K01ESPCT];Funded by Key Laboratory of Degraded and Unused Land Consolidation Engineering,the Ministry of Natural Resources[grant No.SXDJ2024-14].

摘　　要：Biotechnology has limited effectiveness in terms of removing mixed antibiotics at low temperatures,leading to ecological risks arising from the presence of antibiotics in environmental waters.In this study,the removal of tetracycline(TCs)and sulfonamide(SAs)from antibiotic wastewater was improved by the intermittent electrical stimulation of anaerobic-aerobic-coupled upflow bioelectrochemical reactors(AO-UBERs)at low temperatures.The removal effects of oxytetracycline and tetracycline were 48.6±3.5%and 71.5±2.9%,respectively.Under 0.9V,the removal rates of oxytetracycline,tetracycline,and trimethoprim were significantly increased in both the aerobic-cathodic and anaerobic anodic chambers,with a more obvious increase at low temperatures.Compared with the blank control group,the removal efficiency of oxytetracycline,trimethoprim and tetracycline in the electric group was increased by 11.8±2.5%,27.8±10.5%and 11.2±5.8%.The anaerobic chamber contributed more to the removal of TCs and trimethoprim than the aerobic chamber.Furthermore,electrical stimulation selectively enriched electroactive bacteria(Methylophage and Pleuromonas),drug-resistant bacteria(Proteobacteria),and ni-trifying bacteria associated with biodegradation.The abundance of antibiotic-resistance genes is related to the distribution of potential hosts and mobile genetic elements(sul1),and electrical stimulation in-duces the enrichment of both.This suggests that while potentially effective for treating TCs-and SAs-containing wastewater at low temperatures,AO-UBERs may lead to the accumulation of antibiotic-resistance genes.

关 键 词：ANTIBIOTICS BIOELECTROCHEMISTRY Low temperature Antibiotic resistance genes Bacterial community 

分 类 号：X70[环境科学与工程—环境工程]