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중공사분리막 모듈이 침지된 고액분리조를 이용한 활성슬러지의 고액분리
박헌휘(Hun-Hwee Park) 호서대학교 공업기술연구소 2002 공업기술연구 논문집 Vol.21 No.1
In this study, solid-liquid separation of permeates from the final aerobic basin was performed using solid-liquid separation basin containing hollow fiber m em brane m odules(S L S B M ). The M L S S value of the final aerobic basin and the S L S B M w as about 5,500 m g /L in both cases. W hen the air flow was increased from 30 N m3/hr to 45 Nm 3 /hr, the water flux(£/m 2 • hr) w as increased 20% and the fouling of the m em brane was reduced. The water flux w as also measured at various operating conditions such as suction time, idle time and backw ashing time. W hen the backw ashing time was increased twice w ithout an idle time, the flux w as increased 20%. W hen the backw ashing time was increased twice w ith 10 or 20 sec. idle time, the flux w as increased 30%. T he experimental results indicated that suspended solids(SS) and turmdity were removed about 99%. In addition, the organic(CODMn) removal efficiency of SLSBM was 2 times higher than that of the conventional activated sludge process.
고도처리용 MBR의 막오염 저감을 위한 막분리 침전조에 대한 연구
신동환(Shin, Dong-Whan),박헌휘(Park, Hun-Hwee),장인성(Chang In-Soung) 한국산학기술학회 2006 한국산학기술학회 학술대회 Vol.- No.-
본 연구에서는 고도처리를 위한 BNR 공정에 사용되는 MBR (Membrane Bioreactor)의 막 오염(membrane fouling)을 저감시키기 위해 분리막을 침지시킨 침전조를 상하로 나누어 상부는 폭기조로, 하부는 침전조의 역할을 수행하게 하는 새로운 형태의 막분리 침전조 (aerated settler)의 성능을 평가 하였다. 막분리 침전조는 상하로 구분하기 위해서 baffle을 설치하였다. 파일럿 규모 (Q=50㎥/d)의 MBR 공정은 실제 오수를 유입수로 사용하였으며 약 6개월간 운전하였다. 탈질을 위하여 막분리 침전조 하부에서 무산소조로 반송되는 반송수의 DO를 크게 줄어들게 함으로써 무산조에서의 탈질효율이 증가되었다. 처리수의 총 TN 제거율은 75%이었다. 또한 막분리침전조 상·하부의 MLSS 농도 차에 의해 상부에 침지된 막 모듈은 기존의 MBR 공정보다 막 오염 저감 효과가 있어서 세정주기가 증가하였다. 운전 개시 후 4개월째 되는 시점에 TMP가 40cmHg에 도달하여 1회 화학적 약품세정만이 필요하였다.
생물화공 에너지 / 환경 : 저온 플라즈마를 이용한 질소산화물 제거
함성원(Sung Won Ham),박헌휘(Hun Hwee Park),목영선(Young Sun Mok) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.5
The removal of nitric oxide by a pulsed corona discharge process was investigated. As an energy saving technique, the addition of hydrocarbons such as ethylene and propylene to flue gas was examined, and the scheme for the oxidation of NO facilitated by hydrocarbon was discussed. Compared to ethylene known as the most powerful additive, propylene gave much better performance in the conversion of NO. From the theoretical and experimental analyses performed to find out active component dominantly affecting the oxidation of NO, ozone was found to play a major role in the oxidation of NO. It indicates that the removal of NO is also possible by injecting ozone to flue gas as well as by inducing corona discharge. The possibility for the removal of NO using ozone was experimentally proved. Maximum energy utilization efficiency for the removal of nitric oxide was obtained when the pulse-forming capacitance in the pulse voltage generator was five times larger than the geometric capacitance of the corona reactor.