Pilot 플라즈마 반응기를 이용한 하수 중 미생물의 불활성화

• 영문명: Inactivation of Microorganisms in Sewage Using a Pilot Plasma Reactor
• 발행기관: 한국환경보건학회
• 저자명: 김동석(Dong-Seog Kim) 박영식(Young-Seek Park)
• 간행물 정보: 『한국환경보건학회지』제39권 제3호, 289~299쪽, 전체 11쪽
• 주제분류: 공학 > 환경공학
• 파일형태: PDF
• 발행일자: 2013.06.30

영문 초록

Objectives: For the field application of the dielectric barrier discharge plasma reactor, scale-up of the plasma reactor is needed. This study investigated the possibility of inactivation of microorganisms in sewage using pilot multi-plasma reactor. We also considered the possibility of degradation of total organic carbon (TOC) and nonbiodegradable matter (UV254) in sewage. Methods: The pilot plasma reactor consists of plasma reactor with three plasma modules (discharge electrode and quartz dielectric tube), liquid-gas mixer, high voltage transformers, gas supply equipment and a liquid circulation system. In order to determine the operating conditions of the pilot plasma reactor, we performed experiments on the operation parameters such as gas and liquid flow rate and electric discharge voltage. Results: The experimental results showed that optimum operation conditions for the pilot plasma reactor in batch experiments were 1 L/min air flow rate), 4 L/min liquid circulation rate, and 13 kV electric discharge voltage, respectively. The main operation factor of the pilot plasma process was the high voltage. In continuous operation of the air plasma process, residual microorganisms, UV254 absorbance and TOC removal rate at optimal condition of 13 kV were 102.24 CFU/mL, 56.5% and 8.6%, respectively, while in oxygen plasma process at 10 kV, residual microorganisms, UV254 absorbance and TOC removal rate at optimal conditions were 101.0 CFU/mL, 73.3% and 24.4%, respectively. Electric power was increased exponentially with the increase in high voltage (R2 = 0.9964). Electric power = 0.0492×exp(0.6027×electric discharge voltage) Conclusions: Inactivation of microorganisms in sewage effluent using the pilot plasma process was done. The performance of oxygen plasma process was superior to air plasma process. The power consumption of oxygen plasma process was less than that of air plasma process. However, it was considered that the final evaluation of air and oxygen plasma must be evaluated by considering low power consumption, high process performance, operating costs and facility expenses of an oxygen generator.

키워드

E. coli Inactivation Multi-plasma Oxygen gas Sewage