title: Characterization of precursors to trihalomethanes formation in Bangkok source water.
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.
authors.affiliation: National Research Center for Environmental and Hazardous Waste Management, Chulalongkorn University, Bangkok, Thailand.
authors.forename: Bunyarit
authors.initials: B
authors.lastname: Panyapinyopol
authors.forename: Taha F
authors.initials: TF
authors.lastname: Marhaba
authors.forename: Vorapot
authors.initials: V
authors.lastname: Kanokkantapong
authors.forename: Prasert
authors.initials: P
authors.lastname: Pavasant
mesh_terms: D004784:Environmental Monitoring; D013785:Thailand; D022882:Trihalomethanes / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply
chemical_list: D022882:Trihalomethanes; D014874:Water Pollutants, Chemical