• 제목/요약/키워드: Environment Technology

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PSA 공정에 의한 이성분 및 삼성분 혼합기체로부터 수소분리 (Hydrogen Separation from Binary and Ternary Mixture Gases by Pressure Swing Adsorption)

  • 강석현;정병만;최현우;안의섭;장성철;김성현;이병권;최대기
    • Korean Chemical Engineering Research
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    • 제43권6호
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    • pp.728-739
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    • 2005

  • 활성탄을 흡착제로 이용한 2bed-6step PSA 공정에서 이성분 혼합기체 $H_2/Ar$(80％/ 20％)와 삼성분 혼합기체 $H_2/Ar/CH_4$(60％/ 20％/ 20％)의 수소 분리를 연구하였다. 비등온-비단열 상태에서 LRC 등온식과 LDF 모델을 고려하여 공정실험과 공정모사를 하였으며, 주기정상상태에 도달할 때까지 탑 내의 농도와 온도변화를 각각 알아보았다. 두 공정 모두에서 수소에 대한 순도 99％와 회수율 75％의 결과를 얻을 수 있었다. 이때, PSA 공정에 미치는 영향으로는 공급유량, 흡착압력 그리고 P/F ratio를 변수로 실험과 전산모사를 수행하여 결과를 비교하였다. 이 결과로부터, 다성분에서 최적의 공정조건을 결정에서 중요한 결정요인과 삼성분에서 최적의 공정조건을 알아보았다.

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Effect of the Repository Configuration on Radionuclide Transport with the Multi-compartment Model for the LILW Repository Performance

  • Park, Jin-Beak;Park, Joo-Wan;Kim, Chang-Lak;Joonhong Ahn;Daisuke Kawasaki
    • 한국방사성폐기물학회:학술대회논문집
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    • 한국방사성폐기물학회 2004년도 학술논문집
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    • pp.228-228
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    • 2004

  • Nuclear Environment Technology Institute (KHNP-NETEC) developed the conceptual design of the low and intermediate-level radioactive waste (LILW) repository. Among many engineering challenges, it is of particular importance to find out an optimum arrangement of near-surface disposal vaults in the repository area to minimize the radionuclide flux and concentration at the interface between the geo-sphere and bio-sphere. (omitted)

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BTEX 분해미생물의 순수분리와 혼합 배양에 따른 기질 분해율 및 미생물 성장률 변화에 관한 연구 (A Study on Isolation of BTEX Degrading Microorganism and Variation of BTEX Removal Efficiency and Microorganism Growth Rate According to Co-Culture)

  • 정경미;이상협;이한웅;홍석원;김영오;최용수;유명진
    • 한국물환경학회지
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    • 제21권4호
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    • pp.347-352
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    • 2005

  • The isolated microorganisms, Pseudomonas stutzeri, Raoultella planticola (Klebsiella), Serratia fonticola from petroleum contaminated soil were enriched on benzene, toluene, ethylbenzene, o-xylene as carbon and energy sources, respectively. And the degradation characteristics of BTEX was observed in the mixed BTEX substrates. We found that the BTEX in mixed substrates were degraded more than 50% by three isolated microorganisms. Among three isolated microorganisms, the highest degradation rate was observed in Pseudomonas stutzeri, but the degradation rate was different according to microorganisms. In order to increase the degradation efficiency, we applied the co-culture of isolated three microorganisms. The mixture rate of pseudomonas stutzeri : Raoultella planticola (Klebsiella) : Serratia fonticola was follows ; 1:2:1, 1:1:2, and 2:1:1, respectively. In two co-culture of 1:2:1 and 1:1:2, degradation rate was lower than isolated microorganisms. However, degradation rate became higher than isolated microorganisms and the degradation rate of benzene, toluene, and ethylene was more than 95% in co-culture of 2:1:1. The degradation rate increased through the co-culture of isolated microorganisms, however, the growth rate decreased. This was resulted from the substrate competition between microorganisms. The co-culture of microorganisms is a effective method to increase the degradation efficiency of BTEX and the co-culture mixing rate is a important factor for determination of degradation efficiency.

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