Galega biomass for biogas production
2008
Dubrovskis, V., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Engineering | Plume, I., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Engineering | Adamovics, A., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture | Auzins, V., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture | Straume, I., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Engineering
There is need to find an acceptable energy crops for energy production for climatic and soil conditions in Latvian. The 35 mixed swards of fodder galega (Galega orientalis Lam.) were developed on Stagnic Luvisol and Gleyic Podzol soils. Swards were cut two to four times during the growing season. Green biomass yield of pure galega swards varies between 40-70 t haE-1, obtained without application of pesticides or chemical fertilizers. Yield of dry matter (DM) for galega varies between 10.27-14.23 t haE-1 DM, obtained by harvesting in early flower stage. Biogas from galega and cow manure (control) was investigated in laboratory scale digesters of volume 5 l. Methane yield in digesters was 384.2 l/kgVSd; 309.2 l/kgVSd; 244 l/kgVSd obtained from different mixtures of galega and cow manure, and was 218.6 l/kgVSd from cow manure. Estimated cumulative volume of biogas released from galega haylage, having volatile solids content 19.4 % or 11.1 %, was 116 l kgE-1 VS or 244 l kgE-1 VS respectively, or was 2 times higher in digester with lower content of volatile solids after 64-day fermentation period.
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