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Study on disinfection by-products formation according to kind of salt in on-site production

정수장 현장제조염소의 브로메이트와 클로레이트의 생성 특성연구

Min, Byungdae;Chung, Hyenmi;Kim, Taewook;Park, Juhyun
민병대;정현미;김태욱;박주현

  • Received : 2015.08.21
  • Accepted : 2015.10.13
  • Published : 2015.10.15

Abstract

Although disinfection in drinking water treatment plants provides a safer water supply by inactivating pathogenic microorganisms, harmful disinfection by-products may be formed. In this study, the disinfectant, chlorine, was produced on-site from the electrolysis of salt (NaCl), and the by-products of the disinfection process, bromate and chlorate, were analyzed. The provisional guideline levels for bromate and chlorate in drinking water are $10{\mu}g/L$ and $700{\mu}g/L$, in Korea, respectively. Bromide salt was detected at concentrations ranging from 6.0 ~ 622 mg/kg. Bromate and chlorate were detected at concentrations ranging from non-detect (ND) ~ 45.3mg/L and 40.5 ~ 1,202 mg/L, respectively. When comparing the bromide concentration in the salt to the bromate concentration in the chlorine produced by salt electrolysis, the correlation of bromide to bromate concentration was 0.870 (active chlorine concentration from on-site production: 0.6-0.8%, n=40). The correlation of bromate concentration in the chlorine produced to that in the treated water was 0.866.

Keywords

On-site production of chlorine;Bromate;Bromide;Disinfection by-products;Liquid chlorine

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Acknowledgement

Grant : 수돗물 2차 오염방지를 위한 배급수관망 부식성 관리 연구(Ⅱ)