This analysis reveals improved biogas yield from co-digesting rapeseed oil cake with microalgal biomass, suggesting potential for renewable energy generation.
This study aimed to evaluate the potential benefits of co-digesting rapeseed oil cake, a by-product of biodiesel production, with microalgal biomass. Anaerobic fermentation was carried out under mesophilic conditions using various doses of press residue as a co-substrate. The results demonstrate that the addition of rapeseed oil cake enhances biogas production. The highest biogas yield was achieved during co-digestion with 1 g VS·L−1 of microalgal biomass and 0.5 g VS·L−1 of rapeseed oil cake. The average methane content in the biogas was 62.42%. The average hydrogen sulfide concentration ranged from 400 to 700 ppm. The maximum energy yield of 3.76 kWh·kg−1 DM was obtained from co-digesting microalgal and rapeseed oil cake biomass in a 2:1 ratio.
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Hawrot-Paw et al. (2025) studied this question.
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