4种典型抗生素在反硝化体系中的去除特性  

Removal Characteristics of Four Typical Antibiotics in Denitrification System

作　　者：唐佳 陈茜 覃牧川 唐溪 唐崇俭 TANG Jia;CHEN Xi;QIN Mu-chuan;TANG Xi;TANG Chong-jian(School of Metallurgy and Environment,Central South University,Changsha 410083,China;Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution,Central South University,Changsha 410083,China)

机构地区：[1]中南大学冶金与环境学院,长沙410083 [2]国家重金属污染防治工程技术研究中心,长沙410083

出　　处：《环境科学》2022年第6期3204-3210,共7页Environmental Science

基　　金：国家自然科学基金项目(U21A20291,51878662);湖南省科技计划重点项目(2017SK2420);湖南省自然科学基金杰出青年项目(2019JJ20033)。

摘　　要：污水处理厂是抗生素的重要汇集场所,反硝化是污水处理厂生物脱氮的关键环节.为了探究抗生素在反硝化污泥体系的去除特性,选取诺氟沙星(NOR)、土霉素(OTC)、磺胺甲■唑(SMX)和甲氧苄啶(TMP),对比研究了其在不同碳源条件下的变化规律,评估了吸附和生物降解等途径对抗生素去除的贡献.结果表明,反硝化脱氮体系对NOR、 OTC和TMP具有一定的去除作用,且NOR和OTC可被用作碳源进行反硝化.反硝化污泥对NOR和OTC的去除是快速吸附和缓慢生物降解的过程,其中,吸附对NOR和OTC总去除量的贡献率分别达到83.5%和58.9%,生物降解的贡献率分别为16.5%和41.1%.在吸附过程中,胞外聚合物(EPS)吸附的贡献率达到40%以上,而在OTC的生物降解过程中,P450酶发挥重要作用,其贡献率达到20%.Wastewater treatment plants are an important gathering place for antibiotics,where denitrification plays a vital role in biological nitrogen removal.In order to explore the removal characteristics of antibiotics in a denitrifying sludge system,norfloxacin(NOR),oxytetracycline(OTC),sulfamethoxazole(SMX),and trimethoprim(TMP)were selected to investigate their transformation under different carbon source conditions in a denitrification system.The contribution of adsorption and biodegradation for antibiotic removal was also evaluated in this study.The results showed that a certain proportion of NOR,OTC,and TMP could be removed by denitrification,whereas NOR and OTC could act as the sole carbon source for denitrification.The removal of NOR and OTC showed a rapid adsorption and then slow biodegradation trend in the denitrification system.The contributions of adsorption were recorded as 83.5%and 58.9%for NOR and OTC removal,respectively.More than 40%were adsorbed by extracellular polymer substances(EPS),whereas the P450 enzyme played an important role in the OTC biodegradation process,with a contribution of 20%.

关 键 词：反硝化 抗生素 吸附 生物降解 胞外聚合物 

分 类 号：X703[环境科学与工程—环境工程]