Biogas composition depending on the type of plant biomass used
Herout, M., Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Technologickych Zarizeni Staveb | Malatak, J., Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Technologickych Zarizeni Staveb | Kucera, L., Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Technologickych Zarizeni Staveb | Dlabaja, T., Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Technologickych Zarizeni Staveb
The aim of this work was to determine and analyse concentrations of individual biogas components according to the raw material used. Maize silage, grass haylage and rye grain were used as raw materials. The total amount of plant biomass entering the fermenter operating on the principle of wet anaerobic fermentation process varied at around 40% w/w, the rest was liquid beef manure. The measured values were statistically evaluated and optimised for the subsequent effective operation of the biogas plant. The biogas production takes place during the wet fermentation process in the mesophile operation at an average temperature of 40 deg C. The technology of the biogas plant is based on the principle of using two fermenters. It follows from the measured results that maize silage with liquid beef manure in the ratio of 40:60 can produce biogas with a high content of methane; this performance is not stable. At this concentration of input raw material, the formation of undesirable high concentrations of hydrogen sulphide occurs as well. The process of biogas production is stabilised by the addition of other components of plant biomass like grass haylage and rye grain and a limitation of the formation of hydrogen sulphide occurs. In conclusion, the maize silage should form about 80% w/w of the total amount of the plant biomass used.
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