Cometabolic microbial degradation of trichloroethylene in the presence of toluene |
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Authors: | Sui Hong Li Xin-gang Xu Shi-min |
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Affiliation: | 1. National Engineering Research Center for Distillation Technology, Tianjin 300072, China;School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China 2. National Engineering Research Center for Distillation Technology, Tianjin 300072, China |
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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 microg/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 microg/ml. The lag time of TCE decreased and the TCE biodegradation rates increased with the increase of temperature. |
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Keywords: | cometabolism microbial degradation toluene trichloroethylene |
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