Effect of the Pretreatment by Thermal Hydrolysis on Biochemical Methane Potential of Piggery Sludge

The objective of this study was to investigate the organic solubilization (SCOD) and improvement of methane production for pig slurry by thermal hydrolysis. A sludge cake was pretreated by thermal hydrolysis at different reaction temperatures (200, 220, 250, ). Ultimate methane potential (Bu) was determined at several substrate and inoculum (S/I) ratios (1:9, 3:7, 5:5, 7:3 in volume ratio) by biochemical methane potential (BMP) assay for 73 days. Pig slurry SCOD were obtained with 98.4~98.9% at the reaction temperature of . Theoretical methane potentials () of thermal hydrolysates at the reaction temperature of , , , were 0.631, 0.634, 0.705, , respectively. of thermal hydrolysate were decreased from to with the changes of S/I ratio from 1:9 to 7:3, and also of different thermal hydrolysates (, , ) showed same tendency to of thermal hydrolysate according to the changes of S/I ratio. Anaerobic biodegradability () of thermal hydrolysate at different S/I ratios was decreased from 32.2% for S/I ratio of 1:9 to 17.6% for S/I ratio of 7:3. of , , and thermal hydrolysat were decreased from 36.4% to 9.6%, from 31.3% to 0.8%, and from 26.6% to 0.8%, respectively, with the S/I ratio change, respectively. In this study, the rise of thermal reaction temperature caused the decrease of anaerobic digestibility and methane production while organic materials of pig slurry were more solubilized.

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