GU Xin,ZHAI Hong yan,BAI Hui. Health Risk Assessment of Trihalomethanes in Drinking Water and Purification Efficiency of Water Purifiers [J].China Water & Wastewater,2020,36(13):31-37.
Health Risk Assessment of Trihalomethanes in Drinking Water and Purification Efficiency of Water Purifiers
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
13
Page:
31-37
Column:
Date of publication:
2020-07-01
- Keywords:
- drinking water; household water purifier; public drinking water; trihalomethanes; health risk
- Abstract:
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The usage and influent and effluent water quality ［total coliforms, total organic carbon (TOC), free residual chlorine,total chlorine and trihalomethanes (THMs)］ of household water purifiers and public drinking water purifiers in two water supply areas in Tianjin were investigated. No coliform was detected in influent and effluent of the purifiers. Compared to public drinking water purifiers, household water purifiers showed better removal efficiencies of free residual chlorine，total chlorine, TOC, and THMs. For household water purifiers, the removal efficiency of TOC from 30% of the purifiers reached above 80%, the removal efficiency of free residual chlorine from 80% of the purifiers reached 100%, and the removal efficiency of THMs from 80% of the purifiers reached above 75%. For public drinking water purifiers, the removal efficiency of TOC from 80% of the purifiers was lower than 30%, the removal efficiency of free residual chlorine from 50% of the purifiers reached 100%, and the removal efficiency of THMs from 40% of the purifiers reached above 50%. Moreover, water purifiers with reverse osmosis membrane exhibited higher removal efficiencies of TOC, free residual chlorine，total chlorine and THMs than those of purifiers with ultrafiltration membrane. According to analysis results of the health risk model of THMs, the order of carcinogenic risk and noncarcinogenic risk of four THMs was BDCM (bromodichloromethane)>TCM (trichloromethane)>DBCM (dibromochloromethane)>TBM (tribromomethane). The control effect of carcinogenic risk and noncarcinogenic risk of household water purifiers was better than those of public drinking water purifiers.
Last Update:
2020-07-01