For the microporous pleated filter element
, it has a unique characteristic, which has a great effect in actual filtration, that is, the co-current microfiltration of the microporous pleated filter element. The role of the pleated filter element is brought into full play. The raw material liquid is placed upstream of the membrane. Driven by the pressure difference, the solvent and particles smaller than the membrane pores permeate the membrane, and the particles larger than the membrane pores are retained by the membrane. The pressure difference can be pressurized by the raw material liquid side or the permeate can be vacuumed. produce. In this parallel flow operation, with the increase of time, the trapped particles will form a pollution layer on the membrane surface, so that the filtration resistance will grow with time, and the trapped particles will form a pollution layer on the membrane surface, so that the filtration resistance will continue. When the operating pressure is constant, the membrane permeation flow rate will decrease. At the same time, the folding technology can ensure that when fluid passes through the filter element, each unit area of u200bu200bthe filter medium has fluid passing through, ensuring that the area of u200bu200bthe filter medium is completely converted into an effective filter area. Therefore, the parallel flow operation of the microporous folded filter element can only be intermittent, and the pollution layer on the membrane surface must be periodically removed or the membrane replaced. Parallel flow operation is simple and easy, suitable for small-scale occasions such as laboratories and industrial processes with low solid content. Generally, this form can be used directly for materials with solid content less than 0.1%, and materials with solid content above 0.1%. Liquid requires pretreatment. In co-flow microfiltration, if the membrane pore size is smaller than the size of the particles contained in the main liquid, the surface filtration mechanism is the main one. According to this theory, the flux drop caused by the accumulation of trapped particles on the membrane surface can be predicted. When the particle size contained in the main fluid is smaller than the membrane pore size, the particles are trapped in the membrane pores, and the separation mechanism is a deep filtration mechanism. According to this theory, the separation process of particles in gas and liquid can be detected, and the filtration efficiency of removing particles of a given size can be predicted.
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