Influence of chemical composition on the biochemical methane potential of agro-industrial substrates from Estonia
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Kuupäev
2017
Kättesaadav alates
Autorid
Luna-del Risco, M.A.
Orupõld, Kaja
Diaz-Forero, I.
González-Palacio, M.
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
Batch trials were carried out to evaluate the Biochemical Methane Potential (BMP) of
61 different substrates collected from agricultural farms and industrial sites in Estonia. Tests were
performed in 500 mL plasma bottles at 36°C. The highest methane yield from all tested substrates
was obtained from unconsumed dairy products (557 ± 101 L kg-1 VS) while the lowest was
obtained from animal slurries (238 L kg-1 VS ± 42). From tested energy crops, foxtail millet
achieved the highest methane yield (320 L kg-1 VS). Silages from different crops presented
methane yields from 296 ± 31 L CH4 kg-1 VS to 319 ± 19 L CH4 kg-1 VS. The influence of
chemical composition and kinetic rate constants (k) on methane potential was analyzed.
Anaerobic digestibility of selected agro-industrial substrates was markedly influenced by their
organic content, i.e. total proteins and lignin concentrations. Rate constants were found to
correlate negatively with hemicellulose, cellulose and lignin (p < 0.05). Results from this study
suggest that an appropriate characterization of the chemical composition of the substrates is
important not only for predicting BMP and the kinetics rates, but also for identifying possible
inhibitors during the anaerobic digestion process. Results on the BMP and national availability
of studied substrates indicate that herbal biomass and agro-industrial residues are promising
substrates for biogas production in agricultural biogas facilities in Estonia.
Kirjeldus
Article
Märksõnad
biogas, biomass, biochemical methane potential, kinetic rate, agro-industrial, wastes, articles