Blocking filtration model of microfiltration membrane separation for non-Newtonian fluid solution

摘要

Microfiltration (MF) mechanism for non-Newtonian fluid solution is one of the key problems to be resolved in membrane filtration process. To depict the mathematic model of MF rate variation for non-Newtonian fluid solution, Darcy equation was extended to non-Newtonian fluid solution and the basic membrane filtration equation was established. MF rate variation for non-Newtonian fluid based on Darcy equation was derived by introducing the blocking filtration constant. Under the constant pressure, three kinds of MF flat membranes (sulfonated polyethersulfone MF, SPES, 0.45 μ m; cellulose acetate MF, CA, 0.22 μ m and polyamid MF ,PA, 0.22 μ m) were used for the filtration test and the on-line diagnoses of the time dependences of MF rate and the filtrate mass have been carried out to characterize the above model. Experimental results show that the measurement data fit well with the established mathematic model. The MF rate variation rule suggested in this paper could be used for the study on fine filtration including MF together with the conventional fine filtration theory for non-Newtonian fluid based on Poiseuilles equation.