Kinetics of biomethanation of solid tannery waste and the concept of interactive metabolic control |
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Authors: | K Lalitha K R Swaminathan R Padma Bai |
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Institution: | (1) Department of Chemistry, Indian Institute of Technology, 600 036 Madras, India;(2) Central Leather Research Institute, Madras, India |
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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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Keywords: | Biomethanation of tannery waste anaerobic digestion skin collagen metabolic control pollution control methanogenesis mixed culture tannery waste skin collagen biomethanation anaerobic digestion pollution control bioenergy metabolic control mixed culture methanogenesis collagenolysis |
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