| 摘要: |
| 为研究燃料乙醇生产废水回用的可行性，以燃料乙醇生产发酵过程中产生的清液和二次凝水为研究对象，分析其有机酸组成，并研究单一有机酸和经D318离子交换树脂处理前后的清液和二次凝水对酿酒酵母Saccharomyce cerevisiae NJ-2019生长和发酵生产乙醇的影响。结果显示，乙酸、乳酸、丙酸和柠檬酸是清液中的主要有机酸，乙酸和乳酸是二次凝水中的主要有机酸；乳酸和丙酸对酿酒酵母S.cerevisiae NJ-2019的生长和发酵过程表现出显著抑制作用，其最低抑制浓度分别为7.0 g/L和1.0 g/L；清液和二次凝水分别直接回用时，清液对乙醇发酵过程的抑制作用更强；去除或者部分去除有机酸能使清液和二次凝水回用时的乙醇产量分别提高10.11%和9.85%。燃料乙醇发酵过程产生的清液和二次凝水具有回用的潜力，有利于实现乙醇生产过程节能减排。 |
| 关键词: 燃料乙醇 清液 二次凝水 回用 节能减排 有机酸 发酵 |
| DOI：10.13656/j.cnki.gxkx.20200422.002 |
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| 基金项目: |
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| Effects of Supernatant and Secondary Condensate from Industrial Waste Water on Fuel Ethanol Fermentation |
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ZHOU Yong
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| (Cofco Biotechnology Co., Ltd., Bengbu, Anhui, 233010, China) |
| Abstract: |
| In order to study the feasibility of reusing the waste water from fuel ethanol production,the organic acids in the supernatant and secondary condensate samples produced during the process of fuel ethanol fermentation were taken as the research object to analyze the compositions of organic acids in these samples as well as to investigate the effects of single organic acid,water samples before and after D318 ion exchange resin treatment on the growth and ethanol production of S.cerevisiae NJ-2019. Results showed that acetic acid,lactic acid,propionic acid and citric acid were the main organic acids in the supernatant,but the main organic acids in the secondary condensate were acetic acid and lactic acid.Lactic acid and propionic acid showed significant inhibition on the growth and fermentation of S.cerevisiae NJ-2019,with the minimum inhibitory concentrations of 7.0 and 1.0 g/L,respectively.When the supernatant and secondary condensate samples were reused directly,the supernatant presented stronger inhibition on ethanol fermentation process.However,removal or partial removal of organic acids in the supernatant and secondary condensate samples could increase ethanol production by 10.11% and 9.85%,respectively.Therefore,both the supernatant and the secondary condensate produced in the fuel ethanol fermentation had potential for reuse,which was conducive to energy conservation and emission reduction in the ethanol production process. |
| Key words: fuel ethanol supernatant secondary condensate reuse energy conservation and emission reduction organic acids fermentation |
