酵母菌对味精生产中离交尾液的处理初探

通过富集培养并利用选择性培养基分离筛选到2种能适应味精生产过程中离交尾液(COD为40690mg/L,NH₄⁺-N含量为16914mg/L)的酵母菌,经鉴定分属于嗜盐假丝酵母(Candida halophila)和粘红酵母(Rhodotorula glutinis).这二种菌混合培养时在pH4～9范围内其COD去除率均可达到80%以上;对于10倍、3倍、2倍稀释的离交尾液,48h之内,其COD去除率均可高达84.5%,日平均去除速度COD/SS均在1.0kg/(kg@d)以上,远高于对照的活性污泥法对于10倍稀释液最高去除率为78.9%,去除速度为0.34kg/(kg·d)],同时也高于国内报道的其他酵母菌菌株.经处理后,还原糖可去除95.7%,而NH+4-N没有明显变化.

Treatment of Ion-exchange Monosodium Glutamate Wastewater by Yeast

Two strains of yeasts, Candida halophila and Rhodotorula glutinis, were acquired through screening from ion-exchange monosodium glutamate wastewater (IEMGW) which was characterized by its high contents of COD (40,690 mg/L), NH(4+)-N (16,914 mg/L) and SO(4)2- (18,000 mg/L). The mixture of the two species had a good COD removal performance for treating IEMGW in a pH rang of 4-9. The yeast technology was superior to the conventional activated sludge in terms of COD removal and COD decomposition rate, In a dilution rate range of wastewater from 1:1 to 1:9, a COD removal of 84.5% and an average COD decomposition rate of over 1.0 kg/(kg.d) were obtained under an initial pH of 4.