Please use this identifier to cite or link to this item: https://doi.org/10.1023/A:1006076204603
Title: Disinfection by-products in water produced by ozonation and chlorination
Authors: Hu, J.Y. 
Wang, Z.S.
Ng, W.J. 
Ong, S.L. 
Keywords: Chlorination
DBPs
HAAs
Mutagenic activity
Ozonation
THMs
Issue Date: 1999
Source: Hu, J.Y., Wang, Z.S., Ng, W.J., Ong, S.L. (1999). Disinfection by-products in water produced by ozonation and chlorination. Environmental Monitoring and Assessment 59 (1) : 81-93. ScholarBank@NUS Repository. https://doi.org/10.1023/A:1006076204603
Abstract: Water produced by advanced treatment of a groundwater was evaluated to determine the amount of DBPs (Disinfection By-Products) including trihalomethanes (THMs). Both Gas Chromatography (GC) and Gas Chromatography/Mass Spectrometry (GS/MS) were adopted for detection and identification of DBPs such as trihalomethanes (THMs), halo-acetic acids (HAAs) and aldehydes. Two disinfection modes (ozonation followed by chlorination and chlorination alone) were compared to determine the DBPs generation. The mutagenitic acivity of ozonated water, chlorinated water after ozonation and potable water was assessed using the Ames test. Chloroform, dichloroacetic acid (DCAA) and trichloroacetic acid (TCAA) were the main constituents of THMs and HAAs, respectively. THMs accounted for more than 85% of all DBPs measured, whereas haloacetic acids accounted for around 14%. Ozonation followed by chlorination proved to be better in terms of THMs and HAAs control. The combined system produced 28.3% less DBPs compared to chlorination alone. Ozonation was found capable of reducing mutagenic matter in the groundwater by 54.7%. The combined system also resulted in water with no mutagenicity.
Source Title: Environmental Monitoring and Assessment
URI: http://scholarbank.nus.edu.sg/handle/10635/65439
ISSN: 01676369
DOI: 10.1023/A:1006076204603
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