Estimation of biomethane yield from silage fermented biomass of oilseed radish (Raphanus sativus l. var. oleiformis Pers.) for different sowing and harvesting dates
Faculty of Agronomy and Forestry, Vinnytsia National Agrarian University, Soniachna street, 3, UA21008 Vinnytsia, Ukraine
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The potential possibility of using oilseed radish biomass of different sowing dates (technological interval from spring to summer (post-harvest) sowing) and phenological harvesting (budding-green pod) after the silage fermentation procedure for the production of biogas and biomethane using the methodology of anaerobic digestion with the addition of inoculum was investigated. Comprehensive methods for assessing the kinetics and dynamics of production of both total biogas volumes and biomethane production levels were applied, with an assessment of the levels of approximation of the curves of daily volume fixation.
Based on a systematic analysis with an assessment of the individual characteristics of the kinetics of the process of anaerobic digestion of silage substrate for each variant of the experiment, the high potential of this crop at different terms of its sowing and harvesting with a level of bioproductivity at the level of 0.54–3.62 t ha-1 DM (depending on the phase and timing of sowing) at the level of biomethane productivity in the range of SMY 201.03–319.66 LN kg-1ODM at the level of biomethane concentration in the range of 49.92–59.11%.
The maximum level of biomethane production was achieved when using silage mass (inoculum subtracted) obtained by silage fermentation from fresh biomass harvested in the flowering phase during the first sowing period with a level of biochemical methane potential (BMPGomp) of 344.13 LN kg-1ODM, specific methane yield (SMY) of 319.66 LN kg-1ODM at a maximum specific methane production rate (Rm) of 33.74 LN kg-1ODM d-1.