Abstract
This study investigates the effect of catch crops as co-substrate on manure-based anaerobic digestion. Batch experiments were carried out for two catch crops, namely Italian ryegrass (IR) and oil seed radish (OSR), in co-digestion with manure. Methane yields in the range of 271–558 and 216–361 ml CH4/g volatile solids (VS) were obtained for OSR and IR in co-digestion, respectively. OSR co-digestion was chosen for semi-continuous reactor experiments. The addition of 50 % of OSR to manure (on VS basis) in semi-continuous anaerobic digestion resulted in a methane yield of 348 ml CH4/g VS, an improvement of 1.46 times compared to manure alone. Adaptation to OSR was observed, and no ammonia or volatile fatty acid-mediated inhibition was detected. The results prove that it is feasible to use catch crops as co-substrate for manure-based biogas production, obtaining a stable process with significantly higher methane yields than that of manure alone.
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Authors are grateful to Energinet.dk for financial support through the project no. 10683 (Catchcrop2biogas).
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Molinuevo-Salces, B., Ahring, B.K. & Uellendahl, H. Optimization of the Co-Digestion of Catch Crops with Manure Using a Central Composite Design and Reactor Operation. Appl Biochem Biotechnol 175, 1710–1723 (2015). https://doi.org/10.1007/s12010-014-1391-3
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DOI: https://doi.org/10.1007/s12010-014-1391-3