肌苷发酵液的陶瓷膜过滤研究

以工业化陶瓷膜考察了肌苷发酵液在不同浓缩比下的拟稳定通量、粘度及湿固含量变化,在此基础上,将发酵液进、出口调换,可使膜通量提高;分析了水洗方式对肌苷含量及膜通量的影响;探讨了膜的污染机理,提出了有效的膜清洗方法.结果表明:200 nm膜适宜于肌苷发酵液的膜过滤,按流加率4%加入洗水有利于菌体的洗涤,不可逆污染阻力Rf在总阻力中占主要地位,有效的化学清洗方法是:用1%NaOH和0.2%NaClO混合溶液清洗膜40 min后,再以0.5%HNO3溶液清洗5 min,膜通量可迅速恢复.图7,表2,参8.

Membrane Filtration of Inosine Fermentation Broth by Ceramic Membranes

At the different concentration rate the change of quasi-steady filtrate flux,viscosity and wet solid content for inosine fermentation broth were investigated by industrialized ceramic membranes.On basis of this,membrane filtrate flux can be enhanced in the process of inlet in exchange with outlet.The effect of water washing mode on the inosine content and membrane flux was discussed.The mechanism of membrane fouling was investigated and the method of membrane cleaning was obtained.It shons that 200 nm membrane was suited for membrane filtration of inosine fermentation broth.It was advantageous for the washing of strains to feed washing water by feeding ratio 4%.In the total resistance,the irreversible fouling resistancewas principal.The effective method of chemical cleaning was that it took 40 minutes to clean membranes by mixed solution composed of 1% NaOH and 0.2% NaClO,whereafter,0.5%HNO_3 was used to clean membrane for 5 minutes.Results indicated that membrane flux could be recovered rapidly.7figs.,2tabs.,8refs.