Title |
Role of bicarbonate as a pH buffer and electron sink in microbial dechlorination of chloroethenes
|
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Published in |
Microbial Cell Factories, September 2012
|
DOI | 10.1186/1475-2859-11-128 |
Pubmed ID | |
Authors |
Anca G Delgado, Prathap Parameswaran, Devyn Fajardo-Williams, Rolf U Halden, Rosa Krajmalnik-Brown |
Abstract |
Buffering to achieve pH control is crucial for successful trichloroethene (TCE) anaerobic bioremediation. Bicarbonate (HCO3-) is the natural buffer in groundwater and the buffer of choice in the laboratory and at contaminated sites undergoing biological treatment with organohalide respiring microorganisms. However, HCO3- also serves as the electron acceptor for hydrogenotrophic methanogens and hydrogenotrophic homoacetogens, two microbial groups competing with organohalide respirers for hydrogen (H2). We studied the effect of HCO3- as a buffering agent and the effect of HCO3--consuming reactions in a range of concentrations (2.5-30 mM) with an initial pH of 7.5 in H2-fed TCE reductively dechlorinating communities containing Dehalococcoides, hydrogenotrophic methanogens, and hydrogenotrophic homoacetogens. |
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