Occurrence of Trihalomethanes in Chlorinated Tap Water: a Case Study of the Water Supply System of Nakhon Pathom Municipality
The concentrations of trihalomethanes in the tap water in Nakhorn Pathom were investigated. The samples were collected at the treatment plant and along the pipeline during March 2006–April 2007. The concentration was varied in each month depending on the raw water quality. The concentrations of total trihalomethane (Total THMs), chloroform, bromodichloromethane, dibromochloromethane, and bromoform in the tap water were 12.70–41.74, 6.72–29.19, 1.12–11.75, 0.63–3.35 and 0.08–3.40 μg/L, respectively. The concentration of Total THMs from one-third of the samples was in the range of 15–20 μg/L. None of Total THMs concentration exceeded the standard values specified by WHO, EU and USEPA. The total guideline value of all 4 THM species was 0.41 which was lower than WHO guideline value. It was found that the dissolved organic matter containing aromatic rings was the main precursor of THM formation, which was indicated by a correlation coefficient (R2)=0.9413. The concentration of Total THMs was continuously increased when the distance from the treatment plant was increased. This is due to the longer contact time between chlorine and organic matter in the pipelines.
tap water chlorination chlorination by-products trihalomethanes
Mallika PANYAKAPO Pongsri PAOPUREE
Department of Environmental Science,Faculty of Science,Silpakorn University,Nakhon Pathom,73000,Thailand
国际会议
2009 International Symposium on Environmental Science and Technology(2009环境科学与技术国际会议)
上海
英文
1789-1797
2009-06-02（万方平台首次上网日期，不代表论文的发表时间）