Effect of different nutrients on the anaerobic degradation of trichloroethene at optimal temperature

Temperature as an important environmental factor in the in-situ bioremediation of contaminated sites, we examined the effect of temperature on trichloroethene (TCE) anaerobic degradation by a Dehalococcoides-containing consortium (UC-1). In addition, this paper was also intended to determine whether varying the growth medium would provide useful information about the degradation of TCE by UC-1 at the optimal temperature. The results indicated that (i) TCE degradation rate increased with increasing temperature to 35 degrees C; (ii) at 4 degrees C, a part of TCE was degraded to cis-dichloroethene (cis-DCE), and at 20 degrees C, the products of TCE degradation were cis-DCE, vinyl chloride (VC) and ethene, and TCE was completely degraded to VC and ethene at 35 degrees C. Presumably, temperature influences the primary metabolism of Dehalococcoides spp. which results in different TCE degradation rate and different products distribution of TCE degradation at the end of the experiment; (iii) different media compositions had a great influence on the degradation activity of UC-1. (C) 2013 Elsevier Ltd. All rights reserved.