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首页> 外文会议>1998 Joint Conference on the Environment, 1998, Mar 31-Apr 1, 1998, Albuquerque, NM >Kinetic Studies of Aerobic Transformation of Chlorinated Solvents by Butane-Utilizing Microorganisms
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Kinetic Studies of Aerobic Transformation of Chlorinated Solvents by Butane-Utilizing Microorganisms

机译：利用丁烷微生物对氯化溶剂进行好氧转化的动力学研究

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The kinetics of aerobic cometabolism of chlorinated aliphatic hydrocarbons (CAHs) by a butane-grown mixed culture was evaluated, with a focus on measuring the CAH transformation capacity (T_c). Cell inactivation after exposure to CAHs and chloride release from CAH by cometabolism were also evaluated. The T_c values for 22 individual chlorinated compounds were inversely proportional to the chlorine content within each group of chlorinated methanes, ethanes, and ethylenes. Transformation of dichloromethane (DCM) and chloroform (CF) highly inactivated cells, with CF having the lower T_c, but causing greater inactivation. The transformation of chloromethane (CM) had very little effect on cell activity, but had the highest T_c within the chlorinated methanes. Effective transformation was achieved for mono-, di-, and tri-chloroethanes. T_c values ranged from 0.29 μmole/mg-cells for 1,1,2-trichloroethane (1,1,2-TCA) to 7.0 μmole/mg-cells for chloroethane (CA). Cells were more highly inactivated from transforming of 1,2-dichloroethane (1,2-DCA) and 1,1,2-TCA than from 1,1-dichloroethane (1,1-DCA) and 1,1,1-trichloroethane (1,1,1-TCA), suggesting that cells were less inactivated when cells transformed di- or tri-chloroethanes that have chlorines on one carbon compared to those with chlorines on both carbons. For chlorinated ethylenes, T_c values ranged from 0.1 μmole/mg-cells for trichloroethylene (TCE) to 2.7 μmole/mg-cells for vinyl chloride (VC). Transformation of chlorinated ethylenes resulted in very high inactivation of cells. Chloride release studies showed nearly complete oxidative dechlorination of CM, DCM, and CF was observed. Incomplete dechlorination was observed for 1,1-DCA, 1,2-DCA. 1,1,1-TCA, and 1,1,2-TCA, but chloroethane (CA) was completely dechlorinated. Vinyl chloride (VC) and c-DCE were also completely dechlorinated, but only 75% dechlorination resulted for 1,1-DCE transformation. The results show butane-grown microorganisms have potential for cometabolizing a broad range of CAHs. The most promising use will be likely for 1,1,1-TCA and 1,1-DCE that are often observed together as groundwater contaminants.
机译：评估了丁烷生长的混合培养物对氯化脂肪族烃（CAHs）的有氧代谢的动力学，重点是测量CAH转化能力（T_c）。还评估了暴露于CAH后的细胞失活以及通过新陈代谢从CAH中释放出氯化物。 22种单独的氯化化合物的T_c值与每组氯化甲烷，乙烷和乙烯中的氯含量成反比。二氯甲烷（DCM）和氯仿（CF）的转化高度灭活了细胞，CF的T_c较低，但导致更大的失活。氯甲烷（CM）的转化对细胞活性影响很小，但在氯化甲烷中T_c最高。单，二和三氯乙烷实现了有效的转化。 T_c值范围从1,9,1,2-三氯乙烷（1,1,2-TCA）的0.29μmol/ mg-cells到氯乙烷（CA）的7.0μmol/ mg-cells。与1,1,1-二氯乙烷（1,1-DCA）和1,1,1-三氯乙烷相比，1,2-二氯乙烷（1,2-DCA）和1,1,2-TCA转化对细胞的灭活作用更高（1,1,1-TCA），表明当细胞转化一个或两个碳原子上带有氯的二-或三-氯乙烷时，细胞的失活程度较小。对于氯化乙烯，T_c值范围从三氯乙烯（TCE）的0.1μmol/ mg细胞到氯乙烯（VC）的2.7μmol/ mg细胞。氯化乙烯的转化导致细胞高度失活。氯化物释放研究表明，可以观察到CM，DCM和CF几乎完全氧化脱氯。观察到1,1-DCA，1,2-DCA的脱氯不完全。 1,1,1-TCA和1,1,2-TCA，但氯乙烷（CA）已完全脱氯。氯乙烯（VC）和c-DCE也已完全脱氯，但只有1,75％的脱氯可实现1,1-DCE转化。结果表明，丁烷生长的微生物具有潜在的代谢能力，可广泛代谢多种CAH。最有前途的用途可能是1,1,1-TCA和1,1-DCE，它们经常一起被视为地下水污染物。

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