Performance of zeolite and trace elements on biogas production from alkaline hydrogen peroxide pretreated sweet sorghum bagasse slurry

Abstract In order to alleviate the inhibition of sodium ions and phenols on methanogenesis by anaerobic digestion of sweet sorghum bagasse pretreated with alkaline hydrogen peroxide, zeolite and trace elements (TEs) were added to sweet sorghum bagasse slurry (PSSBS) for biogas production. The influence of zeolite dosage and TE on the anaerobic digestion performance was revealed from the perspective of biogas production, as well as the cellulase and dehydrogenase activities. The results showed that zeolite and TE increased methane production and shorten the lag time. The maximum methane yield of 274.5 mL/gVS from PSSBS + 5 g/L zeolite + 1 mL TE could be obtained and 58.4% higher than that of untreated sweet sorghum bagasse. Addition of zeolite and TE was beneficial to increase the activities of cellulase and dehydrogenase of the digestate. This work would provide a theoretical reference for the resource utilization of sweet sorghum bagasse for clean industrial application in future.