Cometabolic microbial degradation of trichloroethylene in the presence of toluene

Abstract： Trichloroethylene(TCE), a common groundwater pollutant, was cometabolized by microorganisms in the presence of toluene as a growth substrate. The effect of concentrations of toluene and TCE and temperature on biodegradation was discussed. Acclimated microorganisms degraded TCE after a lag period of 5 to 22 h depending on toluene concentrations. Approximately 60%, 90% and 64% of TCE were degraded at toluene to TCE concentration ratios of 23:1, 115:1 and 230:1, respectively. At a TCE concentration of 1.46 μg/ml, 80% of TCE and 98.4% of toluene were removed. But less degradation of TCE and toluene was observed when TCE concentration was above 48.8 μg/ml. The lag time of TCE decreased and the TCE biodegradation rates increased with the increase of temperature. 作 者： Sui Hong    LI Xin-Gang    XU Shi-Min   作者单位： Sui Hong(National Engineering Research Center for Distillation Technology, Tianjin 300072, China；School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China)

LI Xin-Gang,XU Shi-Min(National Engineering Research Center for Distillation Technology, Tianjin 300072, China) 

期 刊： 环境科学学报(英文版)  ISTICSCI   Journal： JOURNAL OF ENVIRONMENTAL SCIENCES  年，卷(期)： 2004, 16(3)  分类号： X131  Keywords： cometabolism    microbial degradation    toluene    trichloroethylene