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Characterization of precursors to trihalomethanes formation in Bangkok source water |
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| Authors: | Panyapinyopol Bunyarit Marhaba Taha F Kanokkantapong Vorapot Pavasant Prasert |
| Affiliation: | aNational Research Center for Environmental and Hazardous Waste Management, Chulalongkorn University, Bangkok, Thailand bDepartment of Civil and Environmental Engineering, New Jersey Institute of Technology, Newark, NJ 07102-1982, USA cDepartment of Environmental Health, Faculty of Environment and Public Health, Huachiew Chalermprakiet University, Samutprakarn, Thailand dDepartment of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand eDepartment of Sanitary Engineering, Faculty of Public Health, Mahidol University, Bangkok, Thailand |
| Abstract: | Resin adsorption techniques using three types of resin (DAX-8, AG-MP-50, and WA-10) were employed to characterize the raw water (RW) from the major 3 million m3/day (793 million gal/day) drinking water treatment plant in Bangkok, Thailand. The dissolved organic carbon (DOC) mass distribution sequences of the six organic fractions in raw water, from high to low, were hydrophilic neutral (HPIN), hydrophobic acid (HPOA), hydrophilic acid (HPIA), hydrophobic neutral (HPON), hydrophilic base (HPIB), and hydrophobic base (HPOB). HPIN and HPOA were the two main precursors for trihalomethanes formation (THMFP) in this water source following chlorination. The chlorination of HPON and HPIN fractions only led to the formation of mostly chloroform, while other organic fractions formed both chloroform and bromodichloromethane. The linear dependency between each organic fraction concentration and THMFP indicated that the reactions of each organic fraction with chlorine were first-order. |
| Keywords: | THMFP Disinfection by-products Organic matter Surface water Fractionation |
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