• Title/Summary/Keyword: environment technology

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

  • Kang, Seok-Hyun;Jeong, Byung-Man;Choi, Hyun-Woo;Ahn, Eui-Sub;Jang, Seong-Cheol;Kim, Sung-Hyun;Lee, Byung-Kwon;Choi, Dae-Ki
    • Korean Chemical Engineering Research
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    • v.43 no.6
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    • pp.728-739
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    • 2005

  • An experiment and simulation were performed for hydrogen separation of mixtures by PSA (pressure swing adsorption) process on activated carbon. The binary ($H_2/Ar$; 80％/ 20％) and ternary ($H_2/Ar/CH_4$; 60％/ 20％/ 20％) mixtures were used to study the effects of feed composition. The cyclic performances such as purity, recovery, and productivity of 2bed-6step PSA process were experimentally and theoretically compared under non-isothermal and non-adiabatic conditions. The develped process produced the hydrogen with 99％ purity and 75％ recovery from both processes. Therefore, optimal separation condition was referred multicomponent gas mixtures.

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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
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • 2004.06a
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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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A Study on Isolation of BTEX Degrading Microorganism and Variation of BTEX Removal Efficiency and Microorganism Growth Rate According to Co-Culture (BTEX 분해미생물의 순수분리와 혼합 배양에 따른 기질 분해율 및 미생물 성장률 변화에 관한 연구)

  • Chung, Kyung-mi;Lee, Sang-hyup;Lee, Han-woong;Hong, Seok-won;Kim, Young-o;Choi, Yong-su;Yu, Myong-jin
    • Journal of Korean Society on Water Environment
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    • v.21 no.4
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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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