Many chemically active species such as ·H, ·OH, O3, H2O2, hydrated e-, as well as ultraviolet rays, are produced by Dielectric Barrier Discharge (DBD) plasma in water and are widely use to remove non-biodegradable materials and deactivate microorganisms. As the plasma gas containing chemically active species that is generated from the plasma reaction has a short lifetime and low solubility in water, increasing the dissolution rate of this gas is an important challenge. To this end, the plasma gas and water within reactor were mixed using the air-automizing nozzle, and then, water-gas mixture was injected into water. The dissolving effect of plasma gas was indirectly confirmed by measuring the RNO (N-Dimethyl-4-nitrosoaniline, indicator of the formation of OH radical) solution. The plasma system consisted of an oxygen generator, a high-voltage power supply, a plasma generator and a liquid-gas mixing reactor. Experiments were conducted to examine the effects of location of air-automizing nozzle, flow rate of plasma gas, water circulation rate, and high-voltage on RNO degradation. The experimental results showed that the RNO removal efficiency of the air-automizing nozzle is 29.8% higher than the conventional diffuser. The nozzle position from water surface was not considered to be a major factor in the design and operation of the plasma reactor. The plasma gas flow rate and water circulation rate with the highest RNO removal rate were 3.5 L/min and 1.5 L/min, respectively. The ratio of the plasma gas flow rate to the water circulation rate for obtaining an RNO removal rate of over 95% was 1.67 ~ 4.00.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 실험재료 및 실험방법
  2.2. 분석 및 측정방법
 3. 결과 및 고찰
  3.1. RNO 분해에 대한 산기관과 이류체 노즐의 성능 비교
  3.2. RNO 분해에 대한 이류체 노즐 위치의 영향
  3.3. RNO 분해에 대한 플라즈마 가스 유량의 영향
  3.4. RNO 분해에 대한 물 순환유량의 영향
  3.5. RNO 분해에 대한 플라즈마 고전압의 영향
 4. 결 론
 REFERENCES

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