• Title/Summary/Keyword: Trichloroethylene

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Isotope Selectivity in the CO$_2$Laser Induced Decomposition of Trichloroethylene-H and Trichloroethylene-D

  • Koo Sang Man;Chun Byung Soo;Choo Kwang Yul
    • Bulletin of the Korean Chemical Society
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    • v.10 no.1
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    • pp.96-101
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    • 1989

  • The infrared multiphoton decomposition of trichloroethylene-H(TCE-H) and trichloroehtylene-D(TCE-D) was studied by using the high power $CO_2$ laser. The pressure dependence of TCE-H decomposition showed that the HCl elimination channel to form ClC ≡ CCl was the major step at high pressures, while the HC ≡ CCl formation step became important at low pressures. $Cl_2C$ = CHCl ${\rightarrow}$ (high pressure) ClC ${\equiv}$ CCl + HCl ${\rightarrow}$ (low pressure) HC ${\equiv}$ CCl + 2Cl${\cdot}$($Cl_2$) The IRMPD of TCE-H and TCE-D mixtures with 10P(20) laser line showed that optimum conditions of large isotope selectivity were the low system pressures and high laser powers. The experimentally observed dependence of the branching ratios on the pressure and laser fluence, and the isotope selectivity coefficients were quantitatively explained by using the modified energy grained master equations (EGME) model.

  • https://doi.org/10.5012/bkcs.1989.10.1.96 인용 PDF

Optimization of Cometabolic Trichloroethylene Degradation Conditions by Response Surface Analysis (반응표면 분석법을 이용한 트리클로로에틸렌의 공대사적 분해조건 최적화)

  • 윤성준
    • KSBB Journal
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    • v.15 no.4
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    • pp.393-397
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    • 2000

  • The cometaboic biodegradation conditionso f trichloroethylene(TCE) by Burkholderia cepacia G4 were optimized using response surface analysis. The experimental sets of phenol concentration temperature and pH were designed using central composite experimental design. The optimal conditions of phenol concentration temperature and pH were determined to be 0.91 ppm 21.5$^{\circ}C$ and 7.65 respectively by the Ridge analysis of the contour plot for TCE biodegradation rates. The TCE biodegradation rate could be enhanced up to 2.43 nmol.mg protein$.$min by response surface methodology.

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Numerical Simulation and Laboratory Test Analysis of Air Sparging for TCE Remediation

  • 김훈미;이강근
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2003.04a
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    • pp.348-351
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    • 2003

  • Trichloroethylene, which is one of the representative DNAPL, has been found in underground water sources as a result of the manufactural use, and disposal of the chemical. In this research, in situ air sparging method was chosen to reduce the TCE concentration from the source zone. The concentration reduction in the source zone resulting from air sparging is simulated using the modified STOMP Water-Air operational mode in a two dimensional axisymmetric domain and bench scale test is conducted to analyze the performance of air sparging. The results of laboratory tests are compared with numerical simulations.

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