考察了1,3-丙二醇发酵液金属膜过滤在不同浓缩比下的拟稳定通量、黏度及湿固含量变化,在此基础上初步探讨了膜的污染机理,提出了有效的膜清洗方法.结果表明:50 nm的膜适用于1,3-丙二醇发酵液的膜过滤,按料液体积35%,加入去离子水、浓缩倍率在9左右时回收率达到95%.膜污染的主要来源是蛋白,有效的化学清洗方法是:用质量分数为1%NaOH和0.05%EDTA混合溶液清洗膜30 min后,再以0.5%HNO_3溶液清洗5 min,膜通量可迅速恢复.
At the different concentration rate the change of quasi -steady filtrate flux, viscosity and wet solid content for 1,3- propanediol fermentation broth were investigated by metal membranes.On the basis of this, the mechanism of membrane fouling was pre- investigated and the method of membrane cleaning was obtained.It showed that 50 nm membrane was suited for membrane filtration of 1,3-propanediol fermentation broth.The recovery rate could be improved to 95 % by adding 35 % of the dieonized water, the concentration ratio of about 9.The major source of membrane pollution was protein and effective chemical method of cleaning was that it took 40 minutes to clean membranes by mixed solution composed of 1% NaOH and 0.05 % EDTA, where-after, 0.5 % HNO_3 was used to clean membrane for 5 minutes.The results indicated that membrane flux could be recovered rapidly.
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