Journal
BIORESOURCE TECHNOLOGY
Volume 148, Issue -, Pages 453-460Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.08.095
Keywords
Ethanol fermentation; Thin stillage; Anaerobic digestion; Energetic assessment; Corn
Funding
- Science & Technology Program of Jiangsu Province [BE2011623]
- Scientific Research Project of provincial environmental protection bureau of Jiangsu Province [2012043]
- Tianguan Fuel Ethanol Co. Ltd.
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An integrated corn ethanol-methane fermentation system was proposed to solve the problem of stillage handling, where thin stillage was treated by anaerobic digestion and then reused to make mash for the following ethanol fermentation. This system was evaluated at laboratory and pilot scale. Anaerobic digestion of thin stillage ran steadily with total chemical oxygen demand removal efficiency of 98% at laboratory scale and 97% at pilot scale. Ethanol production was not influenced by recycling anaerobic digestion effluent at laboratory and pilot scale. Compared with dried distillers' grains with solubles produced in conventional process, dried distillers' grains in the proposed system exhibited higher quality because of increased protein concentration and decreased salts concentration. Energetic assessment indicated that application of this novel process enhanced the net energy balance ratio from 1.26 (conventional process) to 1.76. In conclusion, the proposed system possessed technical advantage over the conventional process for corn fuel ethanol production. (C) 2013 Elsevier Ltd. All rights reserved.
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