超滤膜对谷氨酸发酵液的除菌效果研究

Application of Ultrafiltration Membrane in the Sterilization of Glutamic Acid

研究了超滤膜在谷氨酸发酵液中的过滤效果及其清洗工艺。结果表明:超滤膜在谷氨酸发酵液中的菌体去除率达到98%以上,COD的平均去除率达到49%,NH4+-N的平均去除率达到18%,而氨基酸基本无截留;超滤除菌后需采用碱液、氧化液、酸液进行分步清洗,各种清洗溶液的最佳浓度分别为:NaOH溶液20g/L、漂白水30g/L、硝酸溶液15g/L。

In order to comprehensively utilize waste water of MGS, utrafiltration membrane was used for removing microbe in fermented broth in glutamic acid feremtation. The results showed that 98%of bacteria in the fermentation liquid were removed. In addition, the average removal rates of COD and NH4^＋-N were 49% and 18%, respectively, while amino acids could wholly pass through the membrane. Then the used utrafiltration membrane needed to be washed by the lye, oxidation solution and acidic fluid in turn. The best washing agents were 20 g/L of NaOH, 30 g/L of bleaching water and 15 g/L of HNO3.