酶膜反应器制备直链麦芽低聚糖过程中膜污染机制及再生研究

Membrane fouling mechanism and regeneration in the preparation of linear malto-oligosaccharides by enzymatic membrane reactor

应用酶膜反应器制备直链麦芽低聚糖可明显提高生产效率,但不可避免的会使膜组件发生污染,影响产物的制备及分离。该文主要针对在应用陶瓷膜反应器制备直链麦芽低聚糖过程中,膜组件出现的污染现象进行污染模型拟合分析,确定其污染机制由完全堵塞模型所主导;分别应用纯水、柠檬酸、NaOH溶液、NaOH与NaClO的混合溶液、α-淀粉酶5种清洗剂在低压高流速条件下对膜进行清洗再生,研究发现其对应的膜通量恢复率分别为71.53%、86.92%、95.7%、99.61%、和92.31%。碱清洗、氧化剂清洗和酶清洗均能将膜通量恢复至90%以上,其中氧化清洗剂可将膜通量恢复至接近100%,说明对于淀粉及多糖造成的膜污染有着良好的再生效果。该研究可为陶瓷膜在淀粉糖工业中的膜污染及膜再生提供理论支撑及借鉴。

The application of enzymatic membrane reactors to prepare linear malto-oligosaccharides can significantly improve the production efficiency.However,it is inevitable that membrane components can be fouled leading to bad influence on the production and separation of products.This article mainly focused on the pollution model fitting analysis of the pollution phenomenon in the membrane module during the preparation of linear malto-oligosaccharides using ceramic membrane reactor.Results showed that complete blocking model dominated the pollution mechanism.Five cleaning agents including pure water,citric acid,NaOH solution,mixed solution of NaOH and NaClO andα-amylase were used to clean and regenerate the membrane in the condition of low pressure and high flow rate.The corresponding membrane flux recovery rates were 71.53%,86.92%,95.7%,99.61%,92.31%,respectively.Alkaline cleaning,oxidant cleaning,and enzyme cleaning were capable of recovering the membrane flux to more than 90%,among which oxidation cleaning restored to nearly 100%,indicating a good regeneration effect on membrane fouling caused by starch and polysaccharides.This study can provide theoretical support and reference for the membrane fouling and membrane regeneration of ceramic membrane in starch sugar industry.