Cake formation and particle rejection in microfiltration of binary mixtures of particles with two different sizes
Cake formation and particle rejection in microfiltration of binary mixtures of particles with two different sizes
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DOI：
10.1016/j.seppur.2013.12.033
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发表时间：
2014-02
影响因子：
8.6
通讯作者：
E. Iritani;N. Katagiri;Yoshihito Ishikawa;Da-Qi Cao
中科院分区：
文献类型：
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作者：
E. Iritani;N. Katagiri;Yoshihito Ishikawa;Da-Qi Cao
考察了两种不同粒径混合颗粒的微滤性能。将粒径分别为0.522和0.091μm的单分散聚苯胶乳的稀释悬浮液用标称孔径为0.3μm的微滤膜过滤，使其对较大颗粒基本不渗透，但对较小颗粒可渗透。最初形成由较大颗粒组成的滤饼是因为较小颗粒透过膜。然而，由于较小的颗粒被困在较大颗粒的滤饼的孔隙中，通量下降逐渐明显。最终，较小的粒子被完全拒绝，此后，更大和更小的粒子的二元蛋糕都变大了。通量衰减和颗粒截留率的数据反映了这种过滤行为，并用Logistic方程描述了小颗粒截留率随过滤过程的变化。在串联阻力模型的基础上，用Logistic方程很好地描述了通量下降行为，总的滤饼阻力是将捕获较小颗粒引起的滤饼阻力与大颗粒的滤饼阻力相加来表示的。
The filtration behaviors were examined in microfiltration of binary mixtures of particles with two different sizes. Dilute suspension of monodisperse polystyrene latexes with particle diameters of 0.522 and 0.091 μm was filtered using the microfiltration membranes with the nominal pore size of 0.3 μm, making them essentially impermeable to larger particles but permeable to smaller particles.The filter cake comprised of larger particles alone initially formed because smaller particles permeate through the membrane. However, the flux decline became gradually marked since smaller particles were trapped into the pores of the filter cake of larger particles. Eventually, smaller particles were fully rejected, and thereafter the binary cake of both larger and smaller particles grew. This filtration behavior was reflected by both data of flux decline and particle rejection.The logistic equation was employed to describe the variation of the rejection of smaller particles with the progress of filtration. The flux decline behaviors were well described using the logistic equation on the basis of the resistance-in-series model that the total cake resistance was represented by adding the increased cake resistance caused by the capture of smaller particles to the cake resistance of larger particles alone.