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Batch Optimization of Biogas Yield from Pasteurized Slaughterhouse By-Products Incorporating Residues from Bioethanol Industry

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Document pages: 16 pages

Abstract: Batch anaerobic digestion of pasteurized pig slaughterhouse waste (SW) and corn sieving waste (CSW), and anaerobic co-digestion of CSW SW were studied at lab scale employing several carbon to nitrogen ratio (C N) and total solids (TS) content. Mixtures with highest biogas yield and suitable process inhibition parameter values were scaled up to pilot scale. Results showed that SW and CSW co-digestion improved biogas yield over that obtained from mono-digestion of both substrates. Thus, CSW demonstrates to be a proper substrate to balance C N and improves biogas yield. Also, all studies reveal that the best biogas yield for each C N mixture was achieved for the lowest TS content. Moreover, SW CSW mixture with C N 15 and 5 TS achieved the highest biogas yield and the best inhibition parameters values. Pilot scale assay demonstrates that biogas yield, methane yield and degradability for C N 15 mixture were 41 , 25 , and 24 higher than those using C N 20. Also, the methane content was similar for both C N 15 and C N 20 at pilot scale, however, other gasses composition (H2, CO2) presented variations. Kinetic analysis was employed to test cumulative methane production observed for mixtures tested at pilot scale.

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