Assessment of intervention measures on trihalomethane in finished water by interrupted time series analysis
10.11836/JEOM23297
- VernacularTitle:应用中断时间序列方法评估干预措施对陆家嘴水厂出厂水三卤甲烷的影响
- Author:
Yangyang REN
1
;
Hailei QIAN
1
;
Saifeng PEI
1
;
Xiaodong SUN
1
;
Zheng WU
1
;
Chen WU
1
;
Jingxian ZHOU
1
;
Aimin DU
1
;
Shaofeng SUI
1
Author Information
1. .
- Publication Type:Investigation
- Keywords:
drinking water;
disinfection by-products;
trihalomethanes;
interrupted time series;
sanitary intervention
- From:
Journal of Environmental and Occupational Medicine
2024;41(4):420-424
- CountryChina
- Language:Chinese
-
Abstract:
Background The Qingcaosha Reservoir is facing issues of algal blooms and eutrophication, and the resulting increase in the level of chlorination disinfection by-products in the water has been a major concern. Objective To evaluate the impact of "Algae Monitoring and Control Program in Qingcaosha Reservoir" (hereinafter referred to as the program) on the control of trihalomethanes (THMs) in conventional finished water. Methods From 2011 to 2019, water samples were collected from the Lujiazui Water Plant once per season, one sample each time, and the concentrations of four THMs (trichloromethane, dichlorobromomethane, monochlorodibromomethane, and tribromomethane) were measured in the samples. Using 2014 when the program was implemented as a cut-off point, the entire study period was divided into two phases: pre-implementation (2011–2013) and post-implementation(2014–2019). Segmented linear regression with interrupted time series analysis was applied to assess the concentrations and trends of THMs in the finished water before and after the program launch. Results The concentration of total THMs in finished water increased by 1.561 µg·L−1 (P=0.010) for each season of time extension before launching the program. The change in the concentration of total THMs in finished water was not statistically significant after the program launch, but the THMs concentration showed a decreasing trend as the slope was −0.626 (P=0.001). From 2017 until the end of 2019, the average concentration of THMs in finished water of Lujiazui Water Plant dropped to 10 μg·L−1 or less. Conclusions The algae and eutrophication control measures in Qingcaosha Reservoir have achieved good results, controlling THMs in finished water at a low level, and the trend of THMs has changed from a yearly increase pattern before the program to a yearly decrease pattern after the program.
