Anaerobic Phenol Degradation by Microorganisms of Swine Manure |
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Authors: | Ramaraj Boopathy |
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Institution: | (1) Environmental Research Division, Building 203, Argonne National Laboratory, Argonne, IL 60439, USA , US |
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Abstract: | Swine manure contains diverse groups of aerobic and anaerobic bacteria. An anaerobic bacterial consortium containing sulfate-reducing
bacteria (SRB) and acetate-utilizing methanogenic bacteria was isolated from swine manure. This consortium used phenol as
its sole source of carbon and converted it to methane and CO2. The sulfate-reducing bacterial members of the consortium are the incomplete oxidizers, unable to carry out the terminal
oxidation of organic substrates, leaving acetic acid as the end product. The methanogenic bacteria of the consortium converted
the acetic acid to methane. When a methanogen inhibitor was used in the culture medium, phenol was converted to acetic acid
by the SRB, but the acetic acid did not undergo further metabolism. On the other hand, when the growth of SRB in the consortium
was suppressed with a specific SRB inhibitor, namely, molybdenum tetroxide, the phenol was not degraded. Thus, the metabolic
activities of both the sulfate-reducing bacteria and the methanogenic bacteria were essential for complete degradation of
phenol.
Received: 31 January 1997 / Accepted: 7 March 1997 |
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