纤维素乙醇糟液对稻秸猪粪厌氧发酵的促进机制

发布时间：2018-05-06 21:31

本文选题：厌氧发酵 + 沼气　；参考：《环境工程学报》2017年12期

【摘要】：纤维乙醇生产会伴随产出大量酸性糟液。利用厌氧技术处理糟液存在C/N低、p H值低等难题,采用糟液与秸秆、猪粪混合后厌氧发酵是一种有效的糟液处理途径。秸秆添加糟液后,TS比例为3%,6%和9%时各组产气量分别为627.8、585.6和443.9 m L·g~(-1)TS,大幅度高于不添加糟液的秸秆对照组产气量292.5 m L·g~(-1)TS,且嗜氢产甲烷途径增强,甲烷体积分数从低于60%增至70%以上。猪粪添加糟液在较低TS浓度3%时产气量最高676.7 m L·g~(-1)TS,秸秆和猪粪按TS1∶1的比例混合时添加糟液的产气效果最佳。秸秆添加糟液的最大VFAs比秸秆对照高2.8~4.7倍,产气延迟增加,从混合型发酵变为典型的丁酸型发酵;猪粪添加糟液后VFAs浓度相对较低,产气启动快,从混合型发酵转变为典型的丙酸型发酵,说明糟液在不同碳源条件下,有着不同的代谢促进途径。糟液与农业废弃物混合厌氧发酵,是一种高效的共发酵体系。糟液在刺激促进秸秆、猪粪产气提升和解除抑制风险的同时,自身也得到高效降解利用。
[Abstract]:Cellulosic ethanol production can be accompanied by the production of a large amount of acid lees. Low C / N ratio and low pH value exist in the treatment of lees by anaerobic technology. It is an effective way to treat lees by anaerobic fermentation after mixed waste liquid with straw and pig manure. The gas production of each group was 627.8585.6 and 443.9 mL / L respectively, which was significantly higher than that of the straw control group (292.5 mL / kg) and the hydrophilic methanogenic pathway was increased from less than 60% to more than 70%. The maximum gas production of pig manure was 676.7 mL / g ~ (-1) when the concentration of TS was 3 and the mixture of straw and pig dung was the best when the ratio of TS1:1 was the same. The maximum VFAs of the waste liquor added by straw was 2.8N 4.7 times higher than that of the straw control, and the gas production delay increased, from mixed fermentation to typical butyric acid fermentation, the concentration of VFAs was relatively low and the gas production started quickly after adding the waste liquor to pig manure. The transformation from mixed fermentation to typical propionic acid fermentation showed that the lees had different metabolic promoting pathways under different carbon sources. Mixed anaerobic fermentation of lees and agricultural wastes is an efficient co-fermentation system. In addition to stimulating straw, pig manure gas production and removing inhibition risks, the lees can be degraded and utilized efficiently.
【作者单位】：华中农业大学工学院;湖北省健康养殖协同创新中心;农业部沼气科学研究所;
【基金】：国家自然科学基金资助项目(51406064) 中央高校基本科研业务费专项(2015PY077)
【分类号】：X713

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