Trihalomethanes formation potential in groundwater and surface water
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Date
2017-06
Authors
Norainna Binti Che Rozi
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Abstract
Chlorination is widely used as disinfection method in Malaysia which aim ensuring an
acceptable and safe drinking water quality. However, studies conducted demonstrated
that during chlorination process, the reaction between chlorine and natural organic matter
in source waters may cause the formation of Trihalomethanes potential (THMFP).
In this study, factors influencing THM formation such as UV254, pH, and Dissolved
organic carbon (DOC) was investigated. This experiment were conducted with two
different water sources which are groundwater and surface water. The samples were
taken from Borehole, USM and Jalan Baru WTP, Perak. Sodium hypochlorite were
used as disinfectant. The water samples were chlorinated at different pH and contact time
of 1 hr, 3 hrs, 6 hrs, and 24 hrs. After completed contact time, the range of TTHM
concentration for groundwater and surface water were measured.
The results of this study have shown that THM formation increases with increasing
contact time. Besides that, THM formation rates ranged between 7.7 µg/L to 49.4 µg/L
for groundwater while 13.8 µg/L to 40.3 µg/L for surface water. The highest
concentration of TTHM were found at pH 7.