抗生素抗性基因在生活及工业混合废水处理系统中的分布和去除

Distribution and Removal of Antibiotic Resistance Genes in Municipal and Industrial Mixed Wastewater Treatment Systems

抗生素抗性基因(ARGs)由于其广泛的传播与转移,成为日益严峻的环境问题。污水处理厂(WWTP)被公认为ARGs的主要来源之一。膜生物反应器(MBR)是一种新型污染物去除工艺。在一个具有传统生物处理和膜系统处理的城镇污水处理系统的进水中,检出17种ARGs,并首次检出甲氧苄啶类ARGs。进水中sulΙ基因的绝对丰度最高,随后依次是tet C、sulⅡ、tet W、dfr A1、flo R和dfr A13基因。不同的处理系统去除同一种ARGs效果各不相同,MBR对ARGs去除效果显著优于传统生物处理工艺,同一个处理系统处理不同类ARGs,四环素类ARGs被去除的效果显著优于其他ARGs被去除的效果,绝对丰度下降了3.8个数量级。ARGs没有真正意义上的去除,只是从水体转移到污泥中,污泥中的ARGs不断积累。

The antibiotic resistance genes(ARGs)have widely transmitted and transfered in the surroundings and gradually become a serious environmental problem.Wastewater treatment plants(WWTPs)are considered as the main sources of ARGs.Membrane bioreactor(MBR)is an efficient wastewater treatment process for this emerging contaminants.Seventeen ARGs were detected in the influents of a wastewater treatment plant,which applies traditional biological treatment process and MBR process.At the same time,trimethoprim ARGs was first tested and reported.The sulⅠwas the most abundant ARGs in the influents,followed by tet C,sulⅡ,tet W,dfr A1,flo R and dfr A13.The removal efficiencies of ARGs depends on the wastewater treatment process and the types of ARGs.MBR removes more ARGs than the traditional biological treatment process.Under the MBR process,tetracycline ARGs was removed by 3.8 log,and its removal efficiency is better than other ARGs.However,ARGs are not truly got rid of,and instead,they are transported from water to sludge.