Abstract
Anaerobic digestion of calf skin collagenous waste was optimized for a batch process based on accelerated maximal methane yield per gram of input volatile solid. A kinetic analysis with respect to changes in the levels of volatile solid, collagen, amino sugars, amino acids, hydroxyproline, ammonium ions, and volatile fatty acid were followed for a period of 80 d. Distinct metabolic phases included an initial high rate collagenolysis for 4 d, with 50% degradation and was followed by an acidogenic phase between 4–12 d with voltatile fatty acids levels increasing to 215 mmol/L. Subsequently methanogenesis ensued and was maximal between 12–24 d when volatile fatty acids attained steady state levels. During the period of 80 d, the overall decrease in volatile solid level was 65%, whereas the collagen level declined by 85% with 0.45 L of methane yield/g of volatile solid degraded. Based on the levels of various metabolites detected, the concept of interactive metabolic control earlier proposed has been validated.
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Lalitha, K., Swaminathan, K.R. & Padma Bai, R. Kinetics of biomethanation of solid tannery waste and the concept of interactive metabolic control. Appl Biochem Biotechnol 47, 73–87 (1994). https://doi.org/10.1007/BF02788677
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DOI: https://doi.org/10.1007/BF02788677