Effect of Biochar and Anaerobic Fermentation Conditions on the Co-production of Straw Ethanol-methane
The research on co-production of ethanol and methane from straw was conducted to address the issues of incom-plete hemicellulose utilization,low ethanol yield,incomplete biogas fermentation,and low energy conversion rate in straw fermentation.The effects of exogenous biochar on straw ethanol production and different fermentation temperature and pH on methane production from ethanol fermentation residue were investigated.The experimental results demonstrated that bio-char could improve the ethanol production from corn straw,with an achieved concentration of 1.99 mg·mL-1.Moreover,under the anaerobic fermentation temperature of 55 ℃(pH 7.5),corn straw exhibited the highest conversion rates for both ethanol and methane;each gram of dry straw yielded 0.0663 g ethanol and 0.1409 g methane,resulting in an energy con-version rate of 51.25％,which was significantly higher by 13.57％compared to the control group.Biochar-coupled tech-nology for co-producing ethanol and methane can effectively enhance the energy conversion rate of straw while providing a theoretical reference for the multi-stage utilization of corn straw components.
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