Distribution and health risk of residual trihalomethane in regional drinking water
10.19428/j.cnki.sjpm.2023.23069
- VernacularTitle:区域性饮用水中三卤甲烷的残留及健康风险
- Author:
Xuefei PANG
1
;
Minxian ZHAO
2
;
Qiang LIU
2
;
Xiaolong ZHOU
2
;
Songwen LU
2
;
Ying WANG
2
;
Wei LIANG
2
;
Haibing YANG
1
Author Information
1. School of public health, Nanjing Medical University, Nanjing, Jiangsu 210000, China
2. Environment and Health Department, Suzhou Center for Disease Control and Prevention, Suzhou, Jiangsu 215004, China
- Publication Type:Journal Article
- Keywords:
drinking water;
disinfection byproduct;
health risk assessment;
carcinogenic risk;
non-carcinogenic risk
- From:
Shanghai Journal of Preventive Medicine
2023;35(12):1212-1217
- CountryChina
- Language:Chinese
-
Abstract:
ObjectiveTo explore the variation rules and health risks of trihalomethane in regional drinking water， and to provide evidence for the innovative water processing technology and the optimization of drinking water quality. MethodsBased on regional drinking water sanitation monitoring， non-parametric rank sum test was used to analyze the effects of residual trihalomethane production in different periods and with disinfection methods. The United States environmental protection agency （USEPA） classic "four-step" health risk assessment model was used to evaluate the carcinogenic risk and non-carcinogenic risk of trihalomethane through drinking water exposure. ResultsThe yield of trichloromethane in wet season was 6.3 μg·L-1， which was higher than that in dry season. Compared with chlorination pretreatment， ozone pretreatment reduced the content of bromomethane dichloromethane. Compared to liquid chlorine disinfection， sodium hypochlorite treatment incresed the levels of trichloromethane and bromomethane chloride. Although the total carcinogenic and non-carcinogenic risks of trihalomethane in drinking water in the region were at safe levels， they were above the acceptable limits occasionally. The highest carcinogenic risk of trihalomethane were dichlorobromomethane and chlorodibromomethane，and the highest non-carcinogenic risk was trichloromethane. The health risk of children was 1.2 times higher than that for adults. ConclusionThe production of residual trihalomethane in drinking water in this area is relatively low， which is less harmful to the health of adults and children. Monitoring， including other disinfection byproducts， should continue and appropriate disinfection techniques for drinking water should be explored.
