Effect of improvement of the dielectric barrier discharge (DBD) plasma system on the inactivation performance of bacteria were investigated. The improvement of plasma reactor was performed by combination with the basic plasma reactor and UV process or combination with the basic plasma reactor and circulation system which was equipped with gas-liquid mixer. Experimental results showed that tailing effect was appeared after the exponential decrease in basic plasma reactor. There was no enhancement effect on the Ralstonia Solanacearum inactivation with combination of basic plasma process and UV process. The application of gas-liquid mixing device on the basic plasma reactor reduced inactivation time and led to complete sterilization. The effect existence of gas-liquid mixing device, voltage, air flow rate (1 ～ 5 L/min), water circulation rate (2.8 ～ 9.4 L/min) in gas—liquid mixing plasma, plasma voltage and UV power of gas—liquid mixing plasma+UV process were evaluated. The optimum air flow rate, water circulation rate, voltage of gas-liquid mixing system were 3 L/min, 3.5 L/min and 60 V, respectively. There was no enhancement effect on the Ralstonia Solanacearum inactivation with combination of gas-liquid mixing plasma and UV process.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 실험재료 및 실험방법
  2.2. 분석 및 측정
 3. 결과 및 고찰
  3.1. 기본 반응기에서 전압과 플라즈마+UV 공정의 결합이R. Solanacearum 불활성화에 미치는 영향
  3.2. 이온화 가스의 혼합, 공기 공급량 및 액체순환 유량이R. Solanacearum 불활성화에 미치는 영향
  3.3. 기-액 혼합 플라즈마 반응기에서 1차 전압과 가스-혼합 플라즈마+UV 반응기에서 UV 전력이 R.Solanacearum 불활성화에 미치는 영향
 4. 결 론
 참 고 문 헌

• 김동석(대구가톨릭대학교 환경과학과) | Dong-Seog Kim (Department of Environmental Science, Catholic University of Daegu)
• 박영식(대구대학교 기초교육원) | Young-Seek Park (Faculty of Liberal Education, Daegu University) Corresponding author