How do reverse osmosis membranes desalinate seawater? Seawater desalination is the process of utilizing the selective permeability of reverse osmosis membrane to make seawater pass through the high-pressure pump and pressurize it, so that the water molecules and solvents in the seawater can pass through and the salts and other ionic substances are retained, thus producing fresh water. Seawater desalination equipment used by the reverse osmosis membrane membrane pore size is very small, can effectively remove dissolved salts in seawater, colloids, microorganisms, organic matter, etc., with good water quality, low energy consumption, no pollution, simple process, easy to operate and other advantages. Reverse osmosis seawater desalination treatment device has the following characteristics: 1. Compact structure of the device, small volume, simple installation. 2. The seawater desalination treatment device is easy to operate and maintain, free of disassembly for cleaning and maintenance, and easy to manage. 3. The system does not require high temperature of incoming water, as long as any room temperature seawater at 5 ℃ to 45 ℃ can be desalination, and marine equipment are generally equipped with a small power, the host, the work of the sub-machine. Seawater desalination equipment process feed water pretreatment is to ensure that the reverse osmosis system can be the key to long-term stable operation, in the development of seawater pretreatment program should take into full account the existence of a large number of microorganisms in seawater, bacteria and algae and other impurities. The growth of microorganisms will not only bring a lot of trouble to the water intake facilities, and will directly affect the normal operation of desalination equipment and desalination projects. Periodic high tide, low tide, seawater with a lot of sediment, turbidity changes, easy to cause the operation of seawater pretreatment system is not stable. Seawater has a large corrosive, on the system used in the equipment, valves, piping materials to be screened, corrosion resistance should be good.