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Si 입자를 함유한 반도체 세정폐수의 한외여과 특성[I] -Polysulfone 평판막에 의한 투과분리-
곽순철,이석기,전재홍,남석태,최호상 한국막학회 1998 멤브레인 Vol.8 No.2
본 연구는 Si 미립자를 함유한 반도체 세정폐수의 평판막을 이용한 한외여과특성을 검토하였다. 평판막의 투과유속은 시간이 경과함에 따라 점차 감소하는 경향을 나타냈으며, 이현상은 막표면에 형성된 케익층의 증가 및 기공막힘에 기인한다. 흐름형태에 따른 투과유속은 cross flow가 dead-end flow의 약 1.4배 높았다. Si 미립자에 의한 막오염을 제거하는데는 역세법이 sweeping법 보다 우수하였다. 막오염으로 인한 투과유속의 감소는 질소가스로 역세척하여 초기투과유속의 약 85% 정도 회복되었다. 평판막을 이용한 cross flow 공정의 용질배제율은 약 90%였으며, 투과수증의 Si 미립자의 크기는 평균 70 nm였다. Permeation behavior of the semiconductor rinsing wastewater containing Si particles was examined by ultrafiltration using the polysulfone plate membrane. The permeation flux was gradually decreased with time. It was due to the growth of cake deposited on the membrane surface and the pore plugging by Si particles. Permeation flux of cross flow type was 1.4 times higher than that of the dead end flow type. Nitrogen back flushing which is the removing method of membrane fouling was superior to the water sweeping. With nitrogen back flushing, the decrease of permeation flux due to the fouling was recovered about 85 % to the initial flux in the flat plate membrane system. The rejection rate of Si particles was about 90 % and the size of Si particle in the permeate was about 70 nm.
Si 입자를 함유한 반도체 세정폐수의 한외여과 특성 1 : Polysulfone 평판막에 의한 투과분리
곽순철,이석기,전재홍,남석태,최호상 한국막학회 1998 멤브레인 Vol.8 No.2
본 연구는 Si 미립자를 함유한 반도체 세정폐수의 평판막을 이용한 한외여과특성을 검토하였다. 평판막의 투과유속은 시간이 경과함에 따라 점차 감소하는 경향을 나타냈으며, 이현상은 막표면에 형성된 케익층의 증가 및 기공막힘에 기인한다. 흐름형태에 따른 투과유속은 cross flow가 dead-end flow의 약 1.4배 높았다. Si 미립자에 의한 막오염을 제거하는데는 역세법이 sweeping법 보다 우수하였다. 막오염으로 인한 투과유속의 감소는 질소가스로 역세척하여 초기투과유속의 약 85% 정도 회복되었다. 평판막을 이용한 cross flow 공정의 용질배제율은 약 90%였으며, 투과수증의 Si 미립자의 크기는 평균 70 nm였다. Permeation behavior of the semiconductor rinsing wastewater containing Si particles was examined by ultrafiltration using the polysulfone plate membrane. The permeation flux was gradually decreased with time. It was due to the growth of cake deposited on the membrane surface and the pore plugging by Si particles. Permeation flux of cross flow type was 1.4 times higher than that of the dead end flow type. Nitrogen back flushing which is the removing method of membrane fouling was superior to the water sweeping. With nitrogen back flushing, the decrease of permeation flux due to the fouling was recovered about 85 % to the initial flux in the flat plate membrane system. The rejection rate of Si particles was about 90 % and the size of Si particle in the permeate was about 70 nm.
곽순철(Soonchul Gwoak),서충열(Chungyul Seo),강대일(Daeil Kang),박정민(Jungmin Park),임윤성(Yoonsung Yim),황춘식,엄명도(Myoungdo Eom),김종춘(Jongchoon Kim),이영재(Youngjae Lee),표영덕(Youngdug Pyo),정충섭(Choongsub jung),장은정(Eunjung J 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Biodiesel and GTL which are getting interest recently because of there low environmental impact when used as alternative fuels for diesel engines. Futhermore, the engines would not require any significant modification. The tested diesel engines were fueled on blends of synthetic fuels/ultra low sulfur diesel fuel(ULSD). The authors studied regulated emissions(CO, NOx, HC, PM) of diesel alternative fuels using light-duty vehicles and described reduction rate of exhaust emissions of alternative fuels compare to conventional diesel.
곽순철(Soonchul Gwoak),서충열(Chungyul Seo),강대일(Daeil Kang),이태우(Taewoo Lee),신창현(Changhyun Shin),황춘식(Chunsic Hwang),안재국(Jackook Ahn),김성민(Seongmin Kim) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Exhaust emissions of automobile and performance of after-treatment system are impacted by chemical composition of fuel and engine lubricant. Especially, sulfur in fuel and engine lubricant is known to poison oxidation catalyst. Therefore, in this study, we analyzed sulfur of domestically-distributed engine oil for diesel-fuelled vehicle by Energy Dispersive X-ray Fluorescence Spectrometry method, Then, we obtained that the sulfur content of domestically-distributed lubricants for diesel-fuelled vehicles has possibility of impact on exhaust emissions and after-treatment system.
곽순철(Soonchul Gwoak),서충열(Chungyoul Seo),강대일(Daeil Kang),박정민(Jungmin Park),임윤성(Yunsung Lim),황춘식(Chunshik Hwang) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
GTL(Gas-to-Liquids) technology converts natural gas, coal and biomass feedstocks into diesel or kerosene by Fisher-Tropsch synthesis. These synthetic diesel fuels display very high cetane value, low density, free sulfur and aromatics contents and autoignition characteristics. These properties make it potentially valuable as a diesel fuel with lower emissions than conventional diesel. GTL therefore is a promising alternative fuel because it can be used in unmodified diesel engines or vehicle fuel systems. The study regarding regulated emissions(CO, NOx, HC, PM) by light-duty vehicle on Shell GTL(SMDS) described reduction rate of exhaust gas of GTL compare to conventional diesel.