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액상촉매를 이용한 SO₂/NO 동시제거 공정의 최적화 연구
배진열(Jin Youl Bae),정승호(Seung Ho Jung),박돈희(Don Hee Park),박상일(Sang Il Park),정경훈(Kyung Hoon Jung),차규석(Kyu Suk Cha),장태사(Tae Sa Jang),차진명(Jin Myeong Cha) 大韓環境工學會 2007 대한환경공학회지 Vol.29 No.10
화석연료의 사용 증가로 인해 대기오염이 전지구적 차원에서 심각한 문제가 되고 있다. 특히 화석연료의 연소 시 발생되는 SOx, NOx는 다양한 문제를 발생시키기 때문에 발생을 저감시키는 것이 대기오염 관리에서 중요한 목적이 되고 있다. SOx, NOx를 제거하기 위한 다양한 공정이 개발되었으나 몇 가지 문제점들을 가지고 있다. 본 연구의 목적은 연소가스 중에 포함되어 있는 SO₂/NO를 동시제거하기 위해 최적의 액상촉매 조성물, 농도 및 반응조건을 도출하는 데 있다. 다양한 금속염과 킬레이트 및 실험조건에 따른 가스의 제거효율을 살펴보았으며. 그 결과 철염과 EDTA를 선정할 수 있었으며 적정 농도는 각각 0.03 M이었다. 최적반응조건은 pH=8, Ca/S 당량비=1.5이었으며 O₂ 가스 농도는 낮을수록 유리하였다. 본 연구조건 하에서 촉매 성능을 증가시키기 위한 안정제 조성물과 농도는 ascorbic acid=0.024 M, adipic acid=0.024 M, sodium sulfite=0.09 M로 결정되었다. 다만 안정제의 농도가 본 연구의 조건보다 증가한다면 가스의 제거효율도 증가할 것으로 예상된다. With increasing use of fossil fuel, air pollution is becoming a serious problem in the world. Especially SOx and NOx, which are formed when fossil fuel burns, generate various problem and thus abatement of their emission is a major target in air pollution control. Various process have developed to remove SOx and NOx, but that has several disadvantage. This study aimed at selecting the optimum liquid catalyst component, concentration and reaction conditions for simultaneous removal of SO₂/NO in flue gas. It was that make on investigation into SO₂/NO simultaneous removal efficiencies using some metallic salts and chelates under various conditions, which optimum components were selected iron salts and EDTA and its concentrations were 0.03 M respectively. The optimum reaction conditions were pH=8.0, Ca/S equivalent ratio=1.5 and low O₂ concentration. Under the testing conditions of this study, additive component and concentration to increase performance of liquid catalyst were as follow: ascorbic acid=0.024 M, adipic acid=0.024 M and sodium sulfite=0.09 M. But SO₂/NO simultaneous removal efficiency would be increased if additive concentration was to increase in liquid catalyst.
원수의 수질화학과 HA의 물리화학적 특성이 막 오염에 미치는 영향
배진열 ( Jin Youl Bae ),한인섭 ( Ihn Sup Han ),박성호 ( Sung Ho Park ),신지원 ( Jee Won Shin ) 한국물환경학회 2005 한국물환경학회지 Vol.21 No.3
In this study, we investigated the removal efficiencies of pollutants and permeate fluxes depending on chemistry of feed water, various molecular weight cut-offs (MWCOs) and materials of membrane, operating pressure. We used seven MWCO membranes of YC0.5, YM1, YM3, YM10, YM30, YM100 and PM30, humic acid solution and surface water as feed water, and examined variation in permeate flux. Results of TOC removal experiment demonstrate that MWCO lower 1,000daltons could remove humic acid effectively. As increasing solution pH and decreasing divalent cations (Ca^(2+)) concentration, TOC removal increased. But UV_(254) removal efficiency increased with higher divalent cation concentration and solution pH. Membrane fouling increased with increasing electrolyte (NaCl), divalent cation concentration and decreasing solution pH. In spite of initial permeate flux of the hydrophobic membrane (PM30) was higher than that of the hydrophilic membrane (YM30), flux decline of PM30 was significant during operation. At higher operating pressure, compactness of the cake layer on the membrane surface increased, resulting in gradual increase in hydraulic resistance.