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UF is a pressurized membrane separation technology, the aperture range is 0.001 ~ 0.02μm, the operation of raw water under the external driving force (pressure) to trap the water colloid, particles and relatively high molecular weight substances, and water and small solute particles through the membrane separation process. Substances with molecular weight of 5000-300000 can be intercepted by screening through micropores on the surface of the membrane. The application in sewage treatment is: membrane module for solid-liquid separation of wastewater and sludge mixture. The sludge is concentrated and returned to the bioreactor, thus avoiding the loss of microorganisms. The membrane module is equivalent to the traditional secondary sedimentation tank, but it overcomes many shortcomings of the traditional secondary sedimentation tank. According to the location of the membrane components, the solid-liquid separation membrane bioreactor can be divided into two categories: external membrane bioreactor and built-in membrane bioreactor.