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

상수원수의 유기물 특성에 따른 염소처리시 THMs 및 HAAs의 생성특성

  • 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)
  • 오순미 (제주도 광역수자원관리본부) ;
  • 김승현 (경남대학교 토목공학과) ;
  • 이민규 (부경대학교 응용화학공학부) ;
  • 허미란 (제주대학교 토목환경공학전공) ;
  • 감상규 (제주대학교 토목환경공학전공)
  • Published : 2006.08.01

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.

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