Dielectric barrier discharge plasma is a new technique in water pollutant degradation, which that is characterized by the production of chemically active species such as hydroxyl radicals, ozone, hydrogen peroxide, etc. If dissolving of plasma gas generated in the plasma reaction has increased, it is possible to increase the contaminant removal capacity. In this study, the improvement on the dissolving performance of plasma gas was evaluated by the indirect method measuring the overall oxygen transfer coefficient. Experiments were conducted to examine the effects of nozzle type, distance from water surface, air supply rate and liquid circulation rate. The experimental results showed that the KLa value of the 3-prong nozzle is 2.67 times higher than the diffuser. The order of KLa value with nozzle type ranked in the following order: 3-prong nozzle (inner diameter, less 1 mm) > circular nozzle (inner diameter, 1.5 mm) > ellipse nozzle (short diameter 1 mm, long diameter 2.5 mm) > circular nozzle (inner diameter, 3 mm). Optimal liquid circulation rate was appeared to be 1.7 L/min, the value of KLa was 0.510 1/min. The value of KLa with increasing air supply rate was revealed in the form of an exponential such as KLa=0.3581e0.2919＊air flow rate

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 실험재료 및 실험방법
  2.2. 분석 및 측정방법
 3. 결과 및 고찰
  3.1. 노즐 종류에 따른 KLa
  3.2. 3구 노즐과 산기관의 수면 아래 깊이에 따른 KLa변화
  3.3. 액체순환 유량에 따른 KLa 변화
  3.4. 공기공급 유량에 따른 KLa 변화
 4. 결론
 REFERENCE

• 박영식(대구대학교 기초교육대학) | Young-Seek Park (Division of Creative Integrater General Studies, Daegu University) Corresponding author