Enhanced biodegradation of fluoroquinolones and the changes of bacterial communities and antibiotic-resistant genes under intermittent electrical stimulation

被引：27
作者：
Abudureheman, Mukadasi [1 ,2 ]
Ailijiang, Nuerla [1 ,2 ]
Mamat, Anwar [3 ]
Feng, Yuran [1 ,2 ]
He, Chaoyue [1 ,2 ]
Pu, Miao [1 ,2 ]
机构：
[1] Xinjiang Univ, Coll Ecol & Environm, Key Lab Oasis Ecol, Educ Minist, Urumqi 830017, Peoples R China
[2] Minist Educ, Xinjiang Jinghe Observat & Res Stn Temperate Deser, Urumqi 830017, Peoples R China
[3] Xinjiang Univ, Sch Chem Engn & Technol, Urumqi 830017, Peoples R China
来源：
ENVIRONMENTAL RESEARCH | 2023年 / 219卷
基金：
中国国家自然科学基金;
关键词：
Fluoroquinolone; Bioelectrochemical reactor; Intermittent electrical stimulation; Microbial community; Antibiotic -resistant genes; WASTE-WATER TREATMENT; MICROBIAL COMMUNITY; SLUDGE; CIPROFLOXACIN; REDUCTION; REMOVAL; BIOTRANSFORMATION; NORFLOXACIN; PERFORMANCE; OFLOXACIN;
D O I：
10.1016/j.envres.2022.115127
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this study, an anaerobic-aerobic coupling system under intermittent electrical stimulation was used to improve the biodegradation of synthetic wastewater containing fluoroquinolones (FQs). The effect of electrical stimulation on FQ removal performance is more pronounced with appropriate voltage and hydraulic retention time. In addition, the combination of anaerobic-anodic and aerobic-cathodic chambers is more conducive to improving the removal efficiency of FQs. Under 0.9 V, the removal efficiencies of ofloxacin, norfloxacin, cip-rofloxacin, and enrofloxacin were significantly improved in the anaerobic-anodic and aerobic-cathodic system. The contribution of the anaerobic/aerobic anodic chambers to FQ removal was greater than that of the anaer-obic/aerobic cathodic chambers. Electrical stimulation selectively enriched electroactive bacteria related to biodegradation (Desulfovibrio and Terrimonas), antibiotic-resistant bacteria (Atopobium and Neochlamydia), and nitrifying bacteria (SM1A02 and Reyranella). This study indicated the potential effectiveness of intermittent electrical stimulation in treating fluoroquinolone-containing wastewater in a biofilm reactor. However, electrical stimulation led to an increase in mobile genetic elements , induced horizontal gene transfer and enriched resistant bacteria, which accelerated the spread of antibiotic-resistant genes (ARGs) in the system, indicating that the diffusion of ARGs remains a challenge.
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页数：12
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