乳酸发酵与分离耦合法处理马铃薯淀粉废弃物

Study on Coupling Technology of Lactic Acid Fermentation and Extraction Applied on the Treatment of Potato Starchy Waste

以米根霉Rhizopus oryzae为发酵菌种,马铃薯淀粉废弃物为培养基,在培养基初始pH为5.5-6.0,研究了发酵与离子交换树脂耦合法对发酵液利用情况及乳酸产量的影响。结果显示,此方法成功地消除了产物乳酸对米根霉生长和发酵的抑制作用,产酸量达12.59g/L,对糖转化率为79.9%,比CaCO3添加法产量提高近21%。发酵前后总糖含量由19.6%降至3.8%,有效地降低了废水、废渣中的糖含量。

Mycelial fungus Rhizopus oryzae was used for production of Lactic acid from potato waste as the fer- mentation medium. With starting medium at pH 5.5 - 6.0, the effect of a novel coupling method of extractive fermentation of lactic acid by Iron resin on the yield of lactic acid and the utilization of the fermentation liquid was studied. The improved method successfully alleviated the inhibition to lactic acid-producing Rhizopus oryzae growth and fermentation. The yield of acid reaches 12.59g/L, and the conversion rate for glucose is 79.9% , which is increased by 21% than the method of addition with CaCO3. Total carbohydrate content has been decreased greatly from 19.6% to 3.8% in the course of fermentation.