Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Study on the Characteristics of Dielectric Barrier Discharging System and Usability as a Disinfectant

2계면 플라즈마 방전시스템(DBD System)의 특징 및 소독제로서 방전수의 사용가능성에 대한 연구

  • 류승민 (한국과학기술원 건설 및 환경공학과) ;
  • 박희경 (한국과학기술원 건설 및 환경공학과) ;
  • 이봉주 (한국기초과학지원연구원)
  • Received : 2004.07.16
  • Accepted : 2004.07.30
  • Published : 2004.08.15
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Abstract

Innovated technique to inactivate microorganisms has been developed. This technique uses plasma discharge in 2-phase (Air-Water). Dielectric Barrier (two phase) Discharging system is able to produce new oxidants for microorganisms. Products from discharging are $HNO_2$, $NO_2{^-}$, $HNO_3$, $NO_3{^-}$ and ozone but many other radicals can be generated as well. DBD water has low concentration of ozone (about 0.5mg/L), $NO_2{^-}$, $NO_3{^-}$ (about 10mg-N/L, 20mg-N/L respectively) and lots of $H^+$. These products play an important role in oxidation. Oxidation power by KI titration methods is approximately equivalent to $50mg-O_3/L$. Surprisingly stored DBD water could oxidize KI and maintain stable pH (about pH3) even after several days. Stored DBD water for 5 days has also more than 4log disinfection power to E. coli. However, DBD water cannot be used for drinking water directly due to it's toxicity. Additional process to neutralize pH and decrease toxicity must be applied.

Keywords

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