Abstract:In order to overcome the low bioavailability of lignocellulosic biomass, the hydrolysis of rice straw was enhanced by co-inoculating ruminal microbiota and anaerobic sludge in a pilot-scale anaerobic reactor, and the digestion efficiency was evaluated by gradually increasing organic load rate (OLR). The optimal fermentation performance was obtained at the OLR of 4.26 g·(L·d)?1 (calculated in VS), where the biogas yield, methane yield and volumetric biogas productivity reached 528 mL·g?1 (calculated in VS), 287 mL·g?1 and 2.20 L·(L·d)?1, respectively. With the increase of OLR from 1.05 g·(L·d)?1 to 4.26 g·(L·d)?1, the degradation efficiencies of cellulose, hemicellulose and lignin was maintained at (71 ± 2)%, (92 ± 4)% and (15 ± 3)%, respectively. The operational stability indicated that a highly efficient lignocellulose degradation system was successfully established by the continuous reactor operation, providing a theoretical basis for the practical scale-up application. Key words:rice straw/ anaerobic digestion/ organic loading rate (OLR)/ lignocellulose/ degradation.
图1秸秆厌氧消化反应器 Figure1.Anaerobic digestion reactor with rice straw
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1.School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China 2.Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, China Received Date: 2018-11-14 Accepted Date: 2019-03-25 Available Online: 2019-08-06 Keywords:rice straw/ anaerobic digestion/ organic loading rate (OLR)/ lignocellulose/ degradation Abstract:In order to overcome the low bioavailability of lignocellulosic biomass, the hydrolysis of rice straw was enhanced by co-inoculating ruminal microbiota and anaerobic sludge in a pilot-scale anaerobic reactor, and the digestion efficiency was evaluated by gradually increasing organic load rate (OLR). The optimal fermentation performance was obtained at the OLR of 4.26 g·(L·d)?1 (calculated in VS), where the biogas yield, methane yield and volumetric biogas productivity reached 528 mL·g?1 (calculated in VS), 287 mL·g?1 and 2.20 L·(L·d)?1, respectively. With the increase of OLR from 1.05 g·(L·d)?1 to 4.26 g·(L·d)?1, the degradation efficiencies of cellulose, hemicellulose and lignin was maintained at (71 ± 2)%, (92 ± 4)% and (15 ± 3)%, respectively. The operational stability indicated that a highly efficient lignocellulose degradation system was successfully established by the continuous reactor operation, providing a theoretical basis for the practical scale-up application.
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