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Optimisation of C:N Ratio for Co-Digested Processed Industrial FoodWaste and Sewage Sludge Using the BMP Test

Horan, NJ, Siqqiqui, Z and Anaman, K (2011) Optimisation of C:N Ratio for Co-Digested Processed Industrial FoodWaste and Sewage Sludge Using the BMP Test. International Journal of Chemical Reactor Engineering. ISSN 1542-6580

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Abstract

Biomethane production from processed industrial food waste (IFW) in admixture with sewage sludge (primary and waste activated sludge: PS and WAS) was evaluated at a range of C:N ratios using a standard biochemical methane potential (BMP) test. IFW alone had a C:N of 30 whereas for WAS it was 5.4 and thus the C:N ratio of the blends fell in that range. Increasing the IFW content in mix improves the methane potential by increasing both the cumulative biogas production and the rate of methane production. Optimum methane yield 239 mL/g VSremoved occurred at a C:N ratio of 15 which was achieved with a blend containing 11 percent (w/w) IFW. As the fraction of IFW in the blend increased, volatile solids (VS) destruction was increased and this led to a reduction in methane yield and amount of production. The highest destruction of volatile solids of 93 percent was achieved at C:N of 20 followed by C:N 30 and 15. A shortened BMP test is adequate for evaluating optimum admixtures.

Item Type: Article
Copyright, Publisher and Additional Information: © 2001 Berkeley Electronic Press. This is an author produced version of a paper accepted for publication in International Journal of Chemical Reactor Engineering. Uploaded in accordance with the publisher's self-archiving policy
Keywords: biochemical methane potential (BMP), co-blending, methane yield,
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: 13 May 2011 09:06
Last Modified: 08 Feb 2013 17:31
Status: In preparation
Publisher: Berkeley Press
URI: http://eprints.whiterose.ac.uk/id/eprint/42981

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