生物炭与厌氧发酵条件对秸秆乙醇-甲烷联产效果的影响

Effect of Biochar and Anaerobic Fermentation Conditions on the Co-production of Straw Ethanol-methane

为解决秸秆乙醇发酵中半纤维素利用不充分、乙醇产率低、秸秆沼气发酵不完全、秸秆能源转换率低等诸多问题,开展秸秆乙醇-甲烷联产技术研究。通过添加外源生物炭研究秸秆发酵产乙醇效果,并以乙醇发酵残余物为底物,研究不同发酵温度及pH值对秸秆甲烷产率的影响。实验结果表明,在玉米秸秆炭的促进作用下,秸秆产乙醇效果较好,乙醇浓度达1.99 mg·mL^(-1);厌氧发酵温度为55℃(pH值7.5)时,玉米秸秆醇烷转化率最大,每克干秸秆可产0.0663 g乙醇、0.1409 g甲烷,能量转化率达到51.25%,比对照组提高13.57%。通过生物炭偶联乙醇-甲烷联产技术可显著提高秸秆能源转化率,为玉米秸秆组分多级利用提供理论参考。

The research on co-production of ethanol and methane from straw was conducted to address the issues of incomplete 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 biochar 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 conversion rate of 51.25%,which was significantly higher by 13.57%compared to the control group.Biochar-coupled technology 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.