Theoretical and observed biogas production from plant biomass of different fibre contents
2010
Klimiuk, Ewa | Pokój, Tomasz | Budzyński, Wojciech | Dubis, Bogdan
The methane productivity of silage of four crop species -Zea mays L., Sorghum saccharatum, Miscanthus × giganteus and Miscanthus sacchariflorus - was investigated. The experiments revealed that at a hydraulic retention time of 60days the volumetric methane yields from the Z. mays L. or S. saccharatum silages were higher than those from the Miscanthus × giganteus or M. sacchariflorus silages because of the higher crude fibre content in Miscanthus spp. However, at comparable lignin concentrations in the feedstock, methane productivity for M. sacchariflorus (0.19±0.08L/g volatile solids) was twice that of Miscanthus × giganteus (0.10±0.03L/g volatile solids). The efficiency of cellulose conversion varied from 83.6% (S. saccharatum) to 52.1% (Miscanthus × giganteus), and hemicellulose from 88.9% (Z. mays L.) to 59.7% (Miscanthus × giganteus). Conversion of cellulose and hemicellulose depended on the ratio of these polysaccharides to the lignin concentration of the feedstock.
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