Effect of Chlorination on Disinfection Byproducts Production and Release of Microcystins from Bloom-forming Algae

녹조현상 원인조류들의 염소처리에 의한 소독부산물 생성 및 microcystins 유출

  • Park, Hae-Kyung (Han river Environmental Research Laboratory, National Institute of Environment Research) ;
  • Seo, Yong-Chan (Department of Environment Engineering, Sangji University) ;
  • Cho, Il-Hyung (Han river Environmental Research Laboratory, National Institute of Environment Research) ;
  • Park, Byung-Hwang (Department of Environment Engineering, Sangji University)
  • 박혜경 (국립환경과학원 한강물환경연구소) ;
  • 서용찬 (상지대학교 환경공학과) ;
  • 조일형 (국립환경과학원 한강물환경연구소) ;
  • 박병황 (상지대학교 환경공학과)
  • Received : 2005.12.22
  • Accepted : 2006.03.02
  • Published : 2006.05.30

Abstract

The effect of chlorination on disinfection byproducts (DBPs) production from bloom-forming freshwater algae including 7 strains of cyanobacteria and 6 strains of diatoms was investigated. The release and degradation of hepatotoxin (microcystins) by the chlorination on Microcystis under differential condition of the chlorination time and dose were also investigated. The disinfection byproducts formation potentials (DBPFP) of cyanobacterial species and diatoms were ranged from 0.017 to $0.070{\mu}mol\;DBPs/mg$ C and from 0.129 to $0.708{\mu}mol\;DBPs/mg$ C respectively. Among three major groups of DBPs, haloacetonitrils (HANs) was major product in most test strains except Aphanizomenon sp. and Oscillatoria sp. Haloacetic acids (HAAs) was less than 5 % of total DBPs. Chloroform and dichloroacetonitril (DCAN) were dominant compounds in trihalomethanes (THMs) and HANs respectively. After 4 hours chlorination of toxic Microcystis aeruginosa under the dose range of 0.5 to $10mg\;Cl_2/L$, the concentration of intracellular microcystins decreased, but dissolved dissolved microcystins concentration increased with the treatment of more than $3mg\;Cl_2/L$. However the total amount of microcystins was almost constant even at $10mg\;Cl_2/L$ of chlorination. To conclude, our results indicate that the chlorination causes algal cell lysis and release of intracellular microcystins in the intact form to surrounding waters.

Keywords

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