Ultrafiltration is a solution separation process based on the pressure difference on both sides of the membrane and based on the principle of mechanical sieving. The working pressure is usually 0.2-0.6MPa, and the separation pore size is 1nm-0.1μm. Ultrafiltration technology is widely used in substances. Separation, concentration and purification. The ultrafiltration process has no phase change conversion, normal temperature operation, especially suitable for the separation of heat-sensitive substances, and has good temperature resistance, acid and alkali resistance and oxidation resistance. It can be continuous for a long time under the conditions of below 60℃ and pH 2-11 use.
It should be noted that almost all of the ultrafiltration technologies currently used in China have no effect on removing the inorganic calcium and magnesium ions dissolved in water, so the hardness of the water after ultrafiltration has almost no change, and this water is only very clean. Water, but its chemical composition is not much different from tap water. From the point of view of ion content, it is not suitable for direct drinking. If the hardness is high, it is not suitable for direct heating in water heaters and other equipment.