A methodology for optimising feed composition for anaerobic co-digestion of agro-industrial wastes

Sus scrofa Fishes 0211 other engineering and technologies Industrial Waste Agriculture 02 engineering and technology Refuse Disposal 12. Responsible consumption Manure Kinetics Biodegradation, Environmental Bioreactors Biofuels 0202 electrical engineering, electronic engineering, information engineering Animals Anaerobiosis Methane
DOI: 10.1016/j.biortech.2009.09.061 Publication Date: 2009-10-15T08:29:10Z
ABSTRACT
An optimisation protocol for maximising methane production by anaerobic co-digestion of several wastes was carried out. A linear programming method was utilised to set up different blends aimed at maximising the total substrate biodegradation potential (L CH(4)/kg substrate) or the biokinetic potential (L CH(4)/kg substrate d). In order to validate the process, three agro-industrial wastes were considered: pig manure, tuna fish waste and biodiesel waste, and the results obtained were validated by experimental studies in discontinuous assays. The highest biodegradation potential (321 L CH(4)/kg COD) was reached with a mixture composed of 84% pig manure, 5% fish waste and 11% biodiesel waste, while the highest methane production rate (16.4 L CH(4)/kg COD d) was obtained by a mixture containing 88% pig manure, 4% fish waste and 8% biodiesel waste. Linear programming was proved to be a powerful, useful and easy-to-use tool to estimate methane production in co-digestion units where different substrates can be fed.
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