摘要
以汽爆狼尾草的高底物浓度乙醇发酵全残留物为底物,进行甲烷潜力测试(BMP)以及单相全混式连续搅拌反应器(CSTR)厌氧消化实验,以验证乙醇发酵全残留物的产甲烷特性及残留物中各组分在生产清洁能源甲烷时的底物贡献率。经过50 d的BMP实验,甲烷产量最终达到884 mL,相应的甲烷产率为390.6 mL/g VS,其中纤维素和半纤维素在第10天达到产气高峰,累计产气量占全残留物累计产气量的48.2%,小分子酸和酶与酵母在第2天达到产气高峰,其产气量分别占全残留物累计产气量的22.4%和26.4%。随后使用CSTR反应器进行单相厌氧消化,有机负荷从1.5 g VS/(L·d)逐渐提升至3.5 g VS/(L·d),最终获得457.1 L/kg VS的甲烷产率和47.3%的挥发性固体(VS)去除率。结果表明:狼尾草作为一种木质纤维素原料,在获得满足工业蒸馏需求的乙醇浓度后,其发酵全残留物仍可作为良好的底物通过厌氧消化制取甲烷,不仅减少工艺的环境排放负荷,而且可提高原料的利用率。
In this study,the whole stillage of ethanol fermentation of Pennisetum purpureum is used as substrate to do the methane potential test(BMP)and the single-phase continuous stirring reactor(CSTR)anaerobic digestion experiment. The aim is to verify the methane production characteristics of the ethanol residue and the contribution of the components in the residue to the production of clean energy methane. After 50 d of BMP experiments,the final methane production reaches884 mL and the corresponding methane yield is 390.6 mL/g VS,while cellulose and hemicellulose reach a peak of production on tenth day with a percent of 48.2% on the total gas production. The small molecular acid and enzyme reach the peak of gas production on the second day,and the gas production accounts for 22.4% and 26.4% of the total gas production.The organic loading rate was gradually increased from 1.5 g VS/(L·d)to 3.5 g VS/(L·d)using a CSTR reactor followed by a single-phase anaerobic digestion. The final results obtain 457.1 L/kg VS yield of methance and 47.3% VS removal rate.The results show that the ethanol fermentation whole stillage of Pennisetum purpureum can be used as a good anaerobic digestion substrate to produce biogas.
作者
陈乐
左然然
李建安
杜济良
杨秀山
田沈
Chen Le;Zuo Ranran;Li Jian’an;Du Jiliang;Y ang Xiushan;Tian Shen(College of Life Science,Capital Normal University,Beijing 100048,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2020年第3期345-350,共6页
Acta Energiae Solaris Sinica
基金
国家自然科学基金面上项目(31971202)。
