摘要
新型污染物抗生素抗性基因(ARGs)具有极大的生态和健康风险,污水处理厂是其重要的源汇之一;同时,零价铁(ZVI)作为一种强还原性物质,被广泛用于污水的强化处理且作用显著。该文基于现有研究,首先概述了污水处理厂中ARGs的赋存情况和传播机制;其次基于污水和污泥处理环节,评述了污水处理厂中ARGs行为对ZVI强化的处理技术(主要是生物和化学过程)的响应及相关机制,发现ZVI虽能选择性降低ARGs的丰度和多样性,但仍存在处理后出水ARGs丰度的回弹,目前新型ZVI(硫化ZVI、活性炭负载ZVI、银杏叶提取物修饰的纳米ZVI等)有望进一步提高ARGs消除效率并全面控制ARGs潜在风险。
Antibiotic resistance genes(ARGs) as a kind of emerging contaminants, are widely detected in the environment,with potential ecological and health risks. Wastewater treatment plants are considered as key sources and sinks of ARGs, and also play a key role in eliminating ARGs entering the environment. Zero-valent iron(ZVI) as a strong reducing agent has been proved to be excellent in improving wastewater treatment performance. Based on current knowledge, an overview is provided of the occurrence, generation and propagation mechanisms of ARGs in wastewater treatment plants. Reponses of ARGs’ behavior to ZVI-involved technologies, mainly biological and chemical processes, from perspectives of wastewater and waste activated sludge treatments, are also considered. It is found that ZVI can selectively reduce the abundance of ARGs.However, the resilience of ARGs in the effluent after treatments still exists. The current novel ZVI, including sulfidized nanoscale ZVI, activated carbon modified ZVI, Ginkgo biloba L. modified nanoscale ZVI, are expected to further improve ARGs elimination efficiency and comprehensively control their potential risks.
作者
李汶倩
刘心怡
卢媛媛
庞丽娜
杨平
LI Wenqian;LIU Xinyi;LUYuanyuan;PANG Lina;YANG Ping(College of Architecture and Environment,Sichuan Universiy,Chengdu 610065,China;Institute for Infrastructure and Environment,Schoolof Engineering,The University of Edinburgh,Edinburgh EH93JL United Kingdom)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2022年第5期109-117,共9页
Environmental Science & Technology
基金
国家自然科学基金(52079094)
四川大学-遂宁市校市合作专项资金项目(2020CDSN-21)。
关键词
零价铁
抗生素抗性基因
污水
污泥处理
zero-valent iron
antibiotic resistance genes
sewage
sludge treatments
