关于超滤膜临界运行通量的探讨

发布时间：2018-06-26 22:41

本文选题：膜污染 + 临界通量　；参考：《膜科学与技术》2017年01期

【摘要】：临界通量一般被用于反映膜污染状态,但是临界通量对应的压力值偏小,不能完全反映实际过滤过程中的膜污染过程.按照我们提出的临界运行通量概念,本文将临界通量与临界运行通量进行了比较.通过考察无脉冲工艺、脉冲工艺和脉冲+硅藻土组合工艺的临界通量和临界运行通量,探讨二者反映膜污染的情况.结果表明,临界通量虽然可以表征3种工艺下膜污染状态的不同,但是由于此时滤饼层尚未形成,不能完全反映实际膜过滤过程中滤饼层的污染情况,临界通量数值缺乏实际指导意义.临界运行通量则较好地表征了实际膜过滤过程中的膜污染状态,更真实地反映滤饼层对膜通量的影响,与临界通量相比,临界运行通量对于实际工程应用更具实际指导意义.
[Abstract]:The critical flux is generally used to reflect the membrane fouling state, but the pressure value corresponding to the critical flux is too small to fully reflect the membrane fouling process in the actual filtration process. According to the concept of critical operating flux, the critical flux and critical operating flux are compared in this paper. The critical flux and critical operating flux of pulsation-free process, pulse process and pulsed diatomite combination process were investigated, and the reflection of membrane fouling was discussed. The results show that the critical flux can represent the difference of membrane fouling state in the three processes, but because the filter cake layer has not been formed at this time, it can not completely reflect the fouling situation of the filter cake layer in the actual membrane filtration process. The critical flux value is lack of practical guiding significance. The critical operating flux represents the fouling state of the membrane in the actual membrane filtration process, and reflects the effect of the cake layer on the membrane flux more truthfully. Compared with the critical flux, the critical operating flux is more practical and instructive for the practical engineering application.
【作者单位】：分离膜与膜过程国家重点实验室生物化工研究所天津工业大学;
【基金】：国家自然科学基金(21176188,21576210)
【分类号】：TQ051.893

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