“Strange Bedfellows": Positive Interactions During
Biodegradation of Chlorinated Solvents
September 27, 2013
G33 Jordan Hall
David L. Freedman, Ph.D.
Department of Environmental Engineering and Earth Sciences
"The co-occurrence of certain anthropogenic compounds in contaminated aquifers often results in antagonistic interactions. For example, chloroform and 1,1,1-trichloroethane strongly inhibit the Dehalococcoides spp. required for reductive dechlorination of polychlorinated ethenes to non-toxic ethene. However, there are certain combinations of organic contaminants that result in synergistic opportunities. This seminar will review the beneficial interactions that occur during anaerobic biodegradation of dichloromethane by Dehalobacter spp. in combination with organohalide respiration of tetrachloroethene by Dehalococcoides spp.; and during aerobic biodegradation of benzene and chlorinated benzenes by Rhodococcus, Ralstonia, and Variovorax spp. in combination with cometabolic oxidation of cis-1,2-dichloroethene and vinyl chloride. The pathways involved in these interactions will be described, and the implications for in situ bioremediation at hazardous waste sites will be discussed."
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