Key Laboratory of Industrial Ecology and Environmental Engineering (Dalian University of Technology), Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
Key Laboratory of Industrial Ecology and Environmental Engineering (Dalian University of Technology), Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
Bioresour Technol. 2019 Aug;286:121388. doi: 10.1016/j.biortech.2019.121388. Epub 2019 Apr 30.
Commercial ethanol production from straw is a series of complex processes that are energy-intensive and uneconomical. Corn straw was used as a bioethanol source to mix with waste activated sludge for improving anaerobic co-digestion (AcoD) in this study. Ethanol production from the straw after yeast fermentation was 1400-2200 mg COD/L, accounting for about 0.1% of the fermentative effluent, but methane production of the yeast-group increased by 36% compared to that of control-group with no ethanol production in advance. Volatile suspended solid removal achieved 60%, obviously higher than common anaerobic digestion (AD). Multiple lines of evidence including sludge conductance, effects of activated carbon on methanogenesis and microbial community demonstrated that ethanol from the straw fermentation stimulated direct interspecies electron transfer to be established in the digesters. The results suggested that using ethanol produced from straw was a cost-effective novel way for energy recovery from disposal of agricultural and municipal wastes.
从秸秆中生产商业乙醇是一系列复杂的过程，需要大量的能源且不经济。本研究以玉米秸秆为生物乙醇原料，与剩余活性污泥混合，以提高厌氧共消化（AcoD）。酵母发酵后，秸秆中的乙醇产量为 1400-2200mg COD/L，占发酵废水的 0.1%左右，但与对照组相比，提前不生产乙醇的酵母组的甲烷产量增加了 36%。挥发性悬浮固体去除率达到 60%，明显高于普通厌氧消化（AD）。包括污泥电导率、活性炭对产甲烷作用和微生物群落的影响在内的多种证据表明，来自秸秆发酵的乙醇刺激了在消化器中建立直接种间电子转移。结果表明，利用秸秆生产的乙醇是从农业和城市废物处理中回收能源的一种具有成本效益的新方法。
