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Bioresource Technology 99 (2008) 1280–1292
Biogas production with horse dung in solid-phase digestion systems
Sigrid Kusch *, Hans Oechsner, Thomas Jungbluth
University of Hohenheim, Institute for Agricultural Engineering, State Institute for Machinery and Construction in Agriculture,
Garbenstrasse 9, D-70599 Stuttgart, Germany
Received 7 October 2004; received in revised form 12 December 2006; accepted 9 February 2007
Available online 26 March 2007
Abstract
Experiments on methanogenesis from horse dung were conducted in laboratory-scale batch reactors in order to determine the sub-
strate performance in a solid-phase digestion process, more specifically in terms of potential energy recovery and suitable process tech-
nology. Dung from a horse stable with straw bedding was used. The temperature was kept in the mesophilic range. In the percolation
process (with process water sprinkled over the stacked biomass) a proportion of 10–20% of solid inoculum (pre-digested horse dung) was
found to be suitable. Comparative experiments with both percolation and flooding revealed a higher biogas production per volume for
the flooded process, as no addition of solid inoculum was necessary. Methane yield from fresh material was similar in both processes:
around 170 LN CH4 per kg VS added was obtained in six-week cycles with untreated material under optimized conditions. Methane
production was increased after chopping the substrate. Pre-aeration resulted in decreased methane production.
Ó 2007 Elsevier Ltd. All rights reserved.
Keywords: Anaerobic digestion; Dry digestion; High-solids digestion; Percolation; Flooding
1. Introduction tion, the second phase converts soluble matter into biogas.
This allows for a more rapid and more stable -
Digestion with an elevated content of total solids (TS) is pared to single-phase systems (O’Keefe and Chynoweth,
widely used for municipal solid waste (MSW). Since 1993, 2000). However, distinct sep