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KMID : 1024520050140100965
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Journal of the Environmental Sciences
2005 Volume.14 No. 10 p.965 ~ p.972
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e Effect of Physical Chemistry Factors on Formation of Disinfection by-products
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Chung Yong
Kim Jun-Sung
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Abstract
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This research studied the effect of factors that are able to form disinfection by-products (DBPs) of chlorination, including natural organic matter (NOM) with sewage, bromide ions, pH and contact time. Trihalomethane (THMs) yield of was higher than other DBPs yield for the chlorinated humic acid samples. THMs yield of sewage sample was and haloacetonitriles (HANs) yield in the sewage samples were but only for the humic acid samples. As the concentration of bromide ions increased, brominated DBPs increased while chlorinated DBPs decreased, because bromide ions produce brominated DBPs. THMs were highest at a pH of 7.9 and haloacetic acids (HAAs) were highest at a pH of 5. Also THMs increased with increasing pH while HAAs decreased with increasing pH. After chlorination, the rate of THMs and HAA formation are faster at initial contact time and then reaches a nearly constant value after 24 hours. This study considers ways to reduce DBP formation by chlorination.
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KEYWORD
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Trihalomethanes, Disinfection by-products, DBPs factors, Chlorination
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