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.
Critical flux was generally used to reflect the membrane fouling,but the pressure value corresponded critical flux was small,could not reflect the actual membrane fouling in filtrating process.According to our proposed the concept of critical operating flux,critical flux and critical operating flux were compared in this paper.Both two fluxes of the non-pulsation process,pulsation process and pulsation coupled with diatomite were investigated to discuss the case of reflecting the membrane fouling.The results showed that critical flux could show the difference of the membrane fouling state in the three process,but it was lack in the practical guiding significance because the actual membrane filtration process was done in a certain degree of cake layer.However,critical operating flux could better represent the actual state of membrane fouling in filtration process and reflect the influence of cake layer on membrane flux.Compared with critical flux,critical operating flux was sufficient in guiding significance in practical engineering appli cations.
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