期刊
WASTE MANAGEMENT
卷 62, 期 -, 页码 241-246出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2017.01.040
关键词
Saccharomyces cerevisiae; Ethanol; Anaerobically-aerobically treated stillage; Ion exchange resin; Wastewater
资金
- Shandong Province Natural Science Foundation of University Joint Special-Project [ZR2013CL007]
- Independent Research Program of Jiangnan University Youth Fund [1012050205150710]
- Suzhou Science and Technology Support Project [SS201412]
- National Natural Science Foundation of China [21506075]
- Fundamental Research Funds for the Central Universities [JUSRP51504]
A novel cleaner ethanol production process has been developed. Thin stillage is treated initially by anaerobic digestion followed by aerobic digestion and then further treated by chloride anion exchange resin. This allows the fully-digested and resin-treated stillage to be completely recycled for use as process water in the next ethanol fermentation batch, which eliminates wastewater discharges and minimizes consumption of fresh water. The method was evaluated at the laboratory scale. Process parameters were very similar to those found using tap water. Maximal ethanol production rate in the fully-recycled stillage was 0.9 g/L/h, which was similar to the 0.9 g/L/h found with the tap water control. The consumption of fresh water was reduced from 4.1 L/L (fresh water/ethanol) to zero. Compared with anaerobically-aerobically digested stillage which had not been treated with resin, the fermentation time was reduced by 28% (from 72 h to 52 h) and reached the level achieved with tap water. This novel process can assist in sustainable development of the ethanol industry. (C<^>)2017 Elsevier Ltd. All rights reserved.
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