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

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 potenti...

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Bibliographic Details
Published in:Bioresource technology 2010-02, Vol.101 (4), p.1153-1158
Main Authors: Álvarez, J.A., Otero, L., Lema, J.M.
Format: Article
Language:English
Subjects:
agricultural industry
Agriculture
Agronomy. Soil science and plant productions
Anaerobic co-digestion
anaerobic digestion
Anaerobiosis
Animals
Applied sciences
Batch assay
biodegradation
Biodegradation, Environmental
Biodiesel
Biofuels - analysis
biogas
Biological and medical sciences
Biological treatment of sewage sludges and wastes
biomass
Bioreactors
Biotechnology
Blends
Environment and pollution
Exact sciences and technology
Fish
fish waste
Fishes
food processing wastes
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Industrial applications and implications. Economical aspects
Industrial Waste - analysis
industrial wastes
Kinetics
Linear programming
Manure
Manure - analysis
Methane
Methane - analysis
methane production
Optimization
Organic waste
pig manure
Pollution
Refuse Disposal - methods
renewable energy sources
Sus scrofa
Thunnus
tuna
Use of agricultural and forest wastes. Biomass use, bioconversion
Wastes
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Summary: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.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2009.09.061