Abstract: Roll-type reverse osmosis membrane filter core is widely used in water purification because of its large filling area and high separation efficiency. With the implementation of GB 34914 water efficiency standards, the performance of reverse osmosis (ro) membrane filter has met great challenges due to the increase of concentration ratio and operation load under high water efficiency conditions. By analyzing the filtration mechanism, fouling mechanism and mass transfer process equation, it is concluded that the structure of filter element has an important influence on the mass transfer process of reverse osmosis membrane filtration, and then affects the performance of filter element. In order to improve the performance of reverse osmosis membrane, the law of filter performance was studied from four aspects: the direction of water inlet and outlet of filter channel, the design of membrane bag pages, the selection of inlet screen, and the selection of fresh screen, it provides the design idea and technical scheme for improving the performance of reverse osmosis membrane filter core.

Key words: Reverse osmosis membrane, Filter element, Flow channel, Life, Flow rate