The resistance distribution and fouling mechanism of kaolin dynamic membrane in treating wastewater were studied.Based on flux measurement and calculation

the ratio and change of diversified resistances under different operation conditions were made clear

the resistance of dynamic membrane was controlled by in-pore blockage and fouling layer on the dynamic membrane.The total resistance and the ratio of diversified resistances changed with the increase of cross-flow velocity.The classical theory about membrane pollution was used to analyze fouling mechanism of the dynamic membrane

and the following conclusions were reached that particles clogged pores or bridged the pore entrances in the first 10 minutes of filtration

then particles were brought up to the surface

and deposited on the surface of the dynamic membrane.The filtrate flux fitted the cake filtration model when cross-flow velocity was small.Moderately high velocity was advantageous for reducing filtration resistance.