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Anaerobic digestion of lignocellulosic biomass has gained attention in recent years due to its increase availability and productivity. In this study, anaerobic mono- and co-digestion of three lignocellulosic biomass, viz. duckweed, switchgrass, and rice straw, were performed in 1 litre laboratory-scale batch reactors. The initial biochemical methane potential (BMP) test was performed at three different total solids concentrations (10%, 15%, 20%) and cattle dung: feedstock ratios (1:1, 1:1.5, 1:2) under mesophilic conditions (28–32 °C) for 36 days. Co-digestion of feedstocks at 1:1 ratio yielded better results than other cattle dung: feedstock ratios. Optimized physical parameters were further implemented for a scale-up co-digestion study of biogas potential from 4 m3 community-size biogas digesters. The investigation was performed for 60 days maintaining a hydraulic retention time (HRT) of 40 days, and a comparative analysis with mono digestion of cattle dung was also analyzed. Average daily biogas production for digester containing rice straw and cattle dung was 0.36 m3/kg-VS, whereas it was 0.34 m3/kg-VS and 0.32 m3/kg-VS for switchgrass and duckweed, respectively. An overall comparative analysis of the biogas production and its composition for both BMP tests and continuous processes are discussed in this work. |
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