Abstract
Pre-digestion of cattle waste slurry was tried to increase acid production. Batch and semi-continuous systems with pre-digestion times of 1 to 5 days were used. Pre-digestion in a batch system for 1 to 2 days was found to increase acetate production. Use of this pre-digested slurry as feed material for anaerobic digesters increased biogas production by 17–19% and methane content from 68–75% to 75–86%.
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