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Energy optimisation from co-digested waste using a two-phase process to generate hydrogen and methane

Horan, NJ, Siddiqui, Z and Salter, M (2011) Energy optimisation from co-digested waste using a two-phase process to generate hydrogen and methane. International Journal of Hydrogen Energy, 36 (8). 4792 - 4799. ISSN 0360-3199

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Abstract

The total energy produced fromco-digested food waste and sewage sludge was compared for single phase mesophilic anaerobic digestion producing methane and two-phase hydrogen production followed by methane production. Both single and two-phase reactors were operated at close to optimum conditions. The single phase methaniser had a methane yield of 0.48m3 methane/kg VS destroyed. The two-phase system had a hydrogen yield of 0.13m3 hydrogen/kg VS destroyed, and a methane yield of 0.67 m3 methane/kg VS destroyed. Introduction of a hydrogen producing, pre-treatment phase increased the overall VS destruction 69e89%, however the total energy yield decreased by 13.4% due to the low hydrogen yield obtained in the first stage. The release of ammonia in the hydrogeniser was low and so with less alkalinity available, pH control was necessary. It was much higher in the methaniser and adequate to buffer any pH change. This also ensures more nitrogen in the digestate to enhance its value for recycling. The two-stage process is an attractive option where solids destruction is an important consideration but further optimisation of the hydrogen production stage is still required.

Item Type: Article
Keywords: Anaerobic digestion; Food waste and sewage sludge; Acetogenic hydrogen production; Methanogenesis; Energy optimisation
Institution: The University of Leeds
Academic Units: 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: 23 Mar 2011 13:38
Last Modified: 28 Nov 2014 11:47
Published Version: http://dx.doi.org/10.1016/j.ijhydene.2010.12.118
Status: Published
Publisher: Elsevier
Identification Number: 10.1016/j.ijhydene.2010.12.118
URI: http://eprints.whiterose.ac.uk/id/eprint/42903

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