Effects of o-cresol co-disposal and pH on the methanogenic degradation of refuse |
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| Authors: | Sulisti. I.A. Watson-Craik E. Senior |
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| Affiliation: | Department of Bioscience and Biotechnology, University of Strathclyde, Glasgow, UK;International Centre for Waste Technology (Africa), University of Natal, Pietermaritzburg, South Africa |
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| Abstract: | SULISTI, I.A. WATSON-CRAIK AND E. SENIOR. 1996. Both maximum o -cresol degradation and activity of sulphate-reducing bacteria (SRB) were observed at refuse pH values between 7.0 and 8.0. Optimum pH values for methane release were between 6.5 and 7.5. Partial inhibition of methane production was recorded at pH 5.7, 6.0 and 8.0, whilst sulphate reduction was inhibited partially at pH values 5.7–6.5. Both sulphate reduction and methanogenesis were completely inhibited in refuse with initial pH 4.0. The catabolism of acetate occurred under similar conditions to methane production, and was promoted at pH 6.5–7.5. It appeared that propionate oxidation depended upon the activities of SRB. Optimum conditions for the metabolism of propionate and other volatile fatty acids were between pH 7.0 and 8.0. |
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