浙江省单村供水中消毒副产物存在水平及健康风险评估  

Occurrence and health risk of DBPs in finished water from small centralized water plants in Zhejiang province

作　　者：叶小凡 周小峰 万杨 王维 刘丽敏 YE Xiaofan;ZHOU Xiaofeng;WAN Yang;WANG Wei;LIU Limin(Zhejiang Institute of Hydraulics and Estuary(Zhejiang Institute of Marine planning and Design),Hangzhou 310000,China)

机构地区：[1]浙江省水利河口研究院(浙江省海洋规划设计研究院),杭州310000

出　　处：《给水排水》2023年第6期1-8,共8页Water & Wastewater Engineering

基　　金：浙江省水利科技计划项目(RA1908、RC2177);浙江省基础公益研究计划项目(LGC19B070004);中国科学院生态环境研究中心环境化学与生态毒理学国家重点实验室资助项目(KF2018-15)。

摘　　要：以浙江省单村供水站为研究对象,采集8个地级市194座单村水站出厂水,结合微生物、消毒副产物(Disinfectionby-products,DBPs,包括三卤甲烷THMs和卤乙酸HAAs)浓度水平等综合评价农村饮用水安全。结果表明:浙江省单村供水站出厂水的细菌总数达标率为96.1%;总THMs和总HAAs的检出率分别为41.8%和26.3%,平均浓度水平分别为13.1μg/L和14.7μg/L;DBPs主要检出物质为三氯甲烷(TCM)和三氯乙酸(TCAA);出厂水中DBPs致癌风险R值均小于10-4,非致癌风险HI值均介于0~0.5,即长期饮用不会对人体造成慢性毒性效应;单村供水中THMs的风险分级高于HAAs,且相互间存在较强相关性,建议单村供水站将THMs作为指示DBPs。The safety of drinking water in rural areas was analyzed by microorganisms(total number of bacteria),disinfected by-products(DBPs,including THMs and HAAs)and health risks.The evaluation was based on the total of 194 finished water samples from small centralized water plants of eight cities in Zhejiang province.The main influencing factors were also investigated in terms of the condition of water plants.The results showed that the qualification rate of total number of bacteria in the finished water reached 96.1%.The detectable rate of THMs was 41.8%and mean concentration was 13.1μg/L,and the detectable rate of HAAs was 26.3%and mean concentration was 14.7μg/L.In addition,trichloromethane and trichloroacetic acid were the main detected species of DBPs.The carcinogenic risk values of 57.7%of finished water were less than 10-6,while that of 42.3%of finished water were between 10-6~10-4.The range of non-carcinogenic risk values was 0~0.5.Based on the carcinogenic risk and non-carcinogenic risk assessment,it was inferred that long-term drinking finished water from small centralized water plants would not cause toxic effects on the human body.Furthermore,it was suggested that using THMs as a indicator of DBPs.Because the risk grade of THMs was higher than that of HAAs,and there was a strong correlation between them.

关 键 词：农村单村供水站 细菌总数 消毒副产物 健康风险 

分 类 号：TU991[建筑科学—市政工程]