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membrane technology is one kind of technology which widely applies in many fields, especially in the liquid or gas separation, concentration and purification. In ultrafiltration and microfiltration process the solvent and the low molecularsolute pass through the membrane under pressure, the macromolecular solutes and suspended solids are cut off. The membrane technology has many advantages such as highly efficient separation, high selectivity, simple operation, low energy consumption without phase transition, running under room temperature, etc. Generally membrane processes used in liquid separation include microfiltration(MF), ultrafiltration(UF), reverse osmosis(RO), nanofiltration(NF), and membrane bioreactor(MBR).