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Effect of molybdate ions on methanation of simulated and natural waste-waters |
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| Authors: | Jaakko A Puhakka Mirja Salkinoja-Salonen John F Ferguson Mark M Benjamin |
| Institution: | (1) Water and Environmental Engineering, Department of Civil Engineering, Tampere University of Technology, P. O. Box 527, SF-33101 Tampere, Finland;(2) Department of General Microbiology, University of Helsinki, Helsinki, Finland;(3) Department of Civil Engineering, University of Washington, 98195 Seattle, WA, USA |
| Abstract: | Summary Sulphate in concentrations of 500 and 1000 mg SO4-S/l did not inhibit methanation of synthetic waste-water (acetate + methanol + glucose) by sludge from a digester treating neutral spent sulphite process effluents. The role of sulphate reducers in the conversion of those substrates was minor although sulphate-reducing bacteria were present with a viable count similar to that of methane-producing bacteria in the sludge. Neutral spent sulphite liquor was partially converted to methane (40% of chemical oxygen demand) under these conditions.Molybdate (20 mM) inhibited methanation of both synthetic waste-water and neutral spent sulphite liquor. Acetate accumulated in glucose plus molybdate media. Molybdate had a direct inhibitory effect on enriched acetoclastic methane-producing bacteria. Molybdate was bacteriocidic to sulphate-reducing bacteria and bacteriostatic to methane-producing bacteria. |
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