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http://dx.doi.org/10.5322/JES.2006.15.8.785

The Formation Characteristics of THMs and HAAs in Chlorination of Raw Water of Different Organic Matter Characteristics  

Oh, Sun-Mi (Jeju Provincial Water Resources Management Office)
Kim, Seung-Hyun (Department of Civil Engineering, Kyungnam University)
Lee, Min-Gyu (Division of Applied Chemical Engineering, Pukyong National University)
Xu, Mei-Lan (Division of Civil and Environmental Engineering, Cheju National University)
Kam, Sang-Kyu (Division of Civil and Environmental Engineering, Cheju National University)
Publication Information
Journal of Environmental Science International / v.15, no.8, 2006 , pp. 785-797 More about this Journal
Abstract
The formation characteristics of trihalomethanes (THMs) and haloacetic acids (HAAs) were investigated in chlorination of raw water of different organic mallet characteristics. The samples used in this study were hydrophobic (N-HPO) and hydrophilic fraction (N-HPI) (which were concentrated and separated from Nakdong river water), and humic acid (HA) (which is known as a strong hydrophobic acid) as a reference organic matter, the specific UV absorbance (SUVA) of which was 2.19, 1.15 and 7.92, respectively. With increasing chlorine contact time, THMFP and HAAFP (the formation potential of THMs and HAAs) increased, but their increase was different depending on the organic mallet characteristics (i.e., for N-HPI, THMFP was higher than HAAFP, but the inverse result was obtained for N-HPO and HA and the ratio between them was greater for HA), and the mainly formed chemical species were CHCI$_3$ in case of THMs and dichloroacetic acid (DCAA) and trichloroacetic acid (TCAA) in case of HAAs for N-HPO and HA (and the ratios of CHCI$_3$ to total THMs and DCAA and TCAA to total HAAs for HA were higher than those for N-HPO), but for N-HPI, the ratio of brominated THMs was a little higher than that of CHCI$_3$ and the ratio of DCAA and TCAA to total HAAs was lower than that of N-HPO, although they are main chemical species in case of HAAs. Comparing THMFP and HAAFP with the increase in bromide concentration added with those in not adding it, the former increased greatly and its increase was higher for the organic mallet with stronger hydrophobicity, but the latter was lower for N-HPO and N-HPI and was similar for HA. The main chemical species with increasing bromide concentration were CHBt$_3$ in case of THMs regardless of organic matter characteristics, and dibromoacetic acid (DBAA) for N-HPO and N-HPI, DBAA and tribromoacetic acid (TBAA) for HA in case of HAAs. With increasing reaction temperature and pH, THMFP and HAAFP increased for the former, but for the latter, THMFP increased and HAAFP decreased, although the rate of increase or decrease was different with organic mallet characteristics.
Keywords
Trihalomethane formation potential (THMFP); Haloacetic acid formation potential (HAAFP); Organic matter characteristics; Chlorination;
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