| Title |
Effect of Chlorination on Disinfection Byproducts Production and Release of Microcystins from Bloom-forming Algae |
| Authors |
박혜경 ( Hae Kyung Park ) ; 서용찬 ( Yong Chan Seo ) ; 조일형 ( Il Hyung Cho ) ; 박병황 ( Byung Hwang Park ) |
| Keywords |
Bloom-forming algae; Disinfection byproducts; Haloacetonitriles; Microcystins |
| 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 μmol DBPs/㎎ C and from 0.129 to 0.708 μmol DBPs/㎎ 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 10 ㎎ Cl2/L, the concentration of intracellular microcystins decreased, but dissolved dissolved microcystins concentration increased with the treatment of more than 3 ㎎ Cl2/L. However the total amount of microcystins was almost constant even at 10 ㎎ Cl2/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. |