Impact of melafen-metaferm additive on maize silage anaerobic digestion process
2016
Dubrovskis, V., Latvia Univ. of Agriculture, Jelgava (Latvia) | Plume, I., Latvia Univ. of Agriculture, Jelgava (Latvia)
Maize silage is widely used as the raw material in biogas plants, and its fermentation takes a long time. Different additives were used to achieve faster and better decomposition of silage biomass. The additive MM1 (composed of Melafen and Metaferm mixtures) was tested in this study at three different concentration levels of efficiency. The study was performed in 16 bioreactors filled with inoculums, added maize silage and additive MM1 in an amount of 1, 2 or 3 ml. Anaerobic fermentation was performed in 0.75 l bioreactors operating in batch mode at a temperature of 38 ºC. The higher average biogas yield improvement was obtained from bioreactors with 2 ml (by 3.8 %) or 3 ml (by 1.3 %) MM1additive. The addition of MM1 at any concentration to maize silage substrate resulted in an increase in the methane content in biogas up to 3.7 % compared to maize silage substrate processed without MM1 additive. Usage of additive MMI for enhancement of the anaerobic fermentation process can be regarded as useful as the increased methane content in biogas can lower the carbon dioxide emissions and improve the overall efficiency of biogas cogeneration plants.
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