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Optimising the biogas production from leather fleshing waste by co-digestion with MSW.

Shanmugam, P and Horan, NJ (2009) Optimising the biogas production from leather fleshing waste by co-digestion with MSW. Bioresource Technology, 100 (18). 4117 - 4120 . ISSN 1873-2976

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Abstract

Waste from the leather industry, known as limed leather fleshing (LF), has a low C:N (3.2) and an alkaline pH of 11.4. This is a major disadvantage for anaerobic digestion due to ammonia toxicity for methanogenesis. This study describes co-digestion of LF with biodegradable fraction of municipal solids waste optimised over a range of C:N and pH to minimise ammonia and to maximise biogas yield. The optimum conditions were found with a blend that provided C:N of 15 and pH of 6.5 and the cumulative biogas yield increased from 560 mL using LF fraction alone, to 6518 mL with optimum blend. At higher pH of 8.5, unionised ammonia was high (2473 mg L(-1)) coincided with poor biogas yield (47 m Ld(-1)) that confirms ammonia toxicity. By contrast at a pH of 4.5 the ammonia was minimum (510 mg L(-1)), but high VFA (26,803 mg L(-1)) inhibited the methanogens. Biomass activity measured using ATP correlated well with biogas yield as reported previously.

Item Type: Article
Keywords: Biomass, Gases, Hydrogen-Ion Concentration, Tanning
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Civil Engineering (Leeds)
The University of Leeds > Faculty of Engineering (Leeds) > School of Civil Engineering (Leeds) > Inst for Pathogen Control Engineering (Leeds)
Depositing User: Symplectic Publications
Date Deposited: 14 Feb 2011 10:58
Last Modified: 08 Feb 2013 17:30
Status: Published
Publisher: Elsevier Ltd
Identification Number: 10.1016/j.biortech.2009.03.052
URI: http://eprints.whiterose.ac.uk/id/eprint/42787

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