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RISS 인기검색어
- 검색키워드
- 저자 : Chien-Jun Tien (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Evaluation of Intrinsic Bioremediation of Methyl Tert-butyl Ether (MTBE) Contaminated Groundwater
Chen, Colin S.,Tien, Chien-Jun,Zhan, Kai-Van Korean Society of Soil and Groundwater Environment 2014 지하수토양환경 Vol.19 No.5
This paper reported the use of real-time polymerase chain reaction (PCR), denaturing gradient gel electrophoresis (DGGE), and the culture-based method in the intrinsic bioremediation study at a petroleum contaminated site. The study showed that phenol hydroxylase gene was detected in groundwater contaminated with benzene, toluene, ethylbenzene, xylene isomers (BTEX) and methyl tert-butyl ether (MTBE). This indicated that intrinsic bioremediation occurred at the site. DGGE analyses revealed that the petroleum-hydrocarbon plume caused the variation in microbial communities. MTBE degraders including Pseudomonas sp. NKNU01, Bacillus sp. NKNU01, Klebsiella sp. NKNU01, Enterobacter sp. NKNU01, and Enterobacter sp. NKNU02 were isolated from the contaminated groundwater using the cultured-based method. Among these five strains, Enterobacter sp. NKNU02 is the most effective stain at degrading MTBE without the addition of pentane. The MTBE biodegradation experiment indicated that the isolated bacteria were affected by propane. Biodegradation of MTBE was decreased but not totally inhibited in the mixtures of BTEX. Enterobacter sp. NKNU02 degraded about 60% of MTBE in the bioreactor study. Tert-butyl alcohol (TBA), acetic acid, 2-propanol, and propenoic acid were detected using gas chromatography/mass spectrometry during MTBE degraded by the rest cells of Enterobacter sp. NKNU02. The effectiveness of bioremediation of MTBE was assessed for potential field-scale application.
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Evaluation of Intrinsic Bioremediation of Methyl Tert-butyl Ether (MTBE) Contaminated Groundwater
Colin S. Chen,Chien-Jun Tien,Kai-Van Zhan 한국지하수토양환경학회 2014 지하수토양환경 Vol.19 No.5
This paper reported the use of real-time polymerase chain reaction (PCR), denaturing gradient gel electrophoresis(DGGE), and the culture-based method in the intrinsic bioremediation study at a petroleum contaminated site. The studyshowed that phenol hydroxylase gene was detected in groundwater contaminated with benzene, toluene, ethylbenzene,xylene isomers (BTEX) and methyl tert-butyl ether (MTBE). This indicated that intrinsic bioremediation occurred at thesite. DGGE analyses revealed that the petroleum-hydrocarbon plume caused the variation in microbial communities. MTBE degraders including Pseudomonas sp. NKNU01, Bacillus sp. NKNU01, Klebsiella sp. NKNU01, Enterobacter sp. NKNU01, and Enterobacter sp. NKNU02 were isolated from the contaminated groundwater using the cultured-basedmethod. Among these five strains, Enterobacter sp. NKNU02 is the most effective stain at degrading MTBE without theaddition of pentane. The MTBE biodegradation experiment indicated that the isolated bacteria were affected by propane. Biodegradation of MTBE was decreased but not totally inhibited in the mixtures of BTEX. Enterobacter sp. NKNU02degraded about 60% of MTBE in the bioreactor study. Tert-butyl alcohol (TBA), acetic acid, 2-propanol, and propenoicacid were detected using gas chromatography/mass spectrometry during MTBE degraded by the rest cells of Enterobactersp. NKNU02. The effectiveness of bioremediation of MTBE was assessed for potential field-scale application.
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Si-Jia Dong,Jian Ye,Lin Zhu,Li Guo,Peter Jusu Moray,Wei-Lai Liu,Jun Sun,Tien-Chien Jen 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.7
This investigation is aimed to evaluate thermal effects of the high-velocity particle impingement on the coating quality in CGDS (cold gas dynamic spray). To achieve this, the authors used an explicit time integration approach to predict interface temperatures and deformation profiles of the substrate, as well as, their relationship in commercial solver ABAQUS 6.13. Copper (Cu) and aluminum (Al) materials were specified to particle and substrate, respectively. Two essential process parameters, including six different impact velocities (300, 400, 500, 600, 700, 800 m/s) and three different particle sizes (1, 5, 15 μm), were involved in all simulations. There are very good agreements between the simulated and the published that the non-uniform interface temperature and the poor/failure particle deposition have the direct relationship with either impact velocity or particle size. Once again this study strongly demonstrates the thermal effect of the high-velocity particle impingement on coating quality in CGDS, in turn providing insights into process parameter selection.
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