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Long chain volatile fatty acid relationships in anaerobic digestion of swine waste
AbstractVolatile Fatty Acid (VFA) relationships have been receiving increased attention in anaerobic digestion in recent research due to their important role as precursors in methane fermentation and because they are known inhibitors in excess concentrations. Most recently, VFAs have received considerable attention as performance indicators, with particular emphasis on developing stress/failure indices using the short chain acetic and propionic acids. Longer chain VFAs, such as butyric, iso-butyric, valeric and iso-valeric, have received little attention, primarily because they are either completely non-detectable or they are present in low concentrations in the properly functioning digester. Stress/failure indices that would give the operator sufficient time to adjust operating parameters of a digestion system would be an invaluable aid in fortelling impending process failure. Given a simple test that would indicate stress, the operator could reduce the chance of complete failure and thus avoid a 6 to 8 week recovery period. Reported here are promising results of such a test using the relationship of the longer chain branched (iso) VFAs. The relationship developed involves iso-butyric and iso-valeric acids and appears to give as much as 7 days advance notice of digestion failure using methane yield <0·25 liter CH4 per g VS added as the failure criteria.
Long chain volatile fatty acid relationships in anaerobic digestion of swine waste
AbstractVolatile Fatty Acid (VFA) relationships have been receiving increased attention in anaerobic digestion in recent research due to their important role as precursors in methane fermentation and because they are known inhibitors in excess concentrations. Most recently, VFAs have received considerable attention as performance indicators, with particular emphasis on developing stress/failure indices using the short chain acetic and propionic acids. Longer chain VFAs, such as butyric, iso-butyric, valeric and iso-valeric, have received little attention, primarily because they are either completely non-detectable or they are present in low concentrations in the properly functioning digester. Stress/failure indices that would give the operator sufficient time to adjust operating parameters of a digestion system would be an invaluable aid in fortelling impending process failure. Given a simple test that would indicate stress, the operator could reduce the chance of complete failure and thus avoid a 6 to 8 week recovery period. Reported here are promising results of such a test using the relationship of the longer chain branched (iso) VFAs. The relationship developed involves iso-butyric and iso-valeric acids and appears to give as much as 7 days advance notice of digestion failure using methane yield <0·25 liter CH4 per g VS added as the failure criteria.
Long chain volatile fatty acid relationships in anaerobic digestion of swine waste
Hill, D.T. (author) / Holmberg, R.D. (author)
Biological Wastes ; 23 ; 195-214
1987-08-18
20 pages
Article (Journal)
Electronic Resource
English
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