Nanofiltration is a range of pressure between reverse osmosis and ultrafiltration driven membrane separation process, the nanofiltration membrane pore size range of about a few nanometers in diameter removal solute particles 1 nanometer (nm) or so, MWCO 100 to 1000, not only for water desalination and moderate softening at low pressure. Drinking water is mainly used in the field to remove trihalomethanes intermediates, smell, color, pesticides, synthetic detergent, dissolved organic matter, Ca, Mg, such as hardness components and evaporation of residual substances. A great feature is the nanofiltration membrane with a charge of the body. This is at a very low pressure it still has an important reason for the higher molecular weight cutoff for desalination and membrane hundreds of inorganic salts can also be removed. Compared to reverse osmosis, its lower operating pressure, so nanofiltration also known as "low-pressure reverse osmosis" or "loose reverse osmosis." Nanofiltration technical characteristics: (1) the core membrane components using imported organic film, combined with the technical requirements and the specific needs of users choose to use different configurations of film form, to ensure that the different system components endometrial interception performance, membrane flux and entire membrane system stability and reliability. (2) nanofiltration membrane system can operate at a lower pressure, desalted and concentrated to achieve synchronization of materials, and the production cycle is short, desalination is more thorough, high-income product purity, good quality stability. (3) According to customers' specific needs, you can go through nanofiltration permeate recovery and membrane components after cleaning by a professional resume to the best performance of membrane elements, the full realization of economic membrane device. (4) the process always at room temperature, and the process no phase change, without any adverse effect on the material in each of the effective components, particularly suitable for the treatment of heat-sensitive material, a high active ingredient content of the resulting product, according to process requirements may continue into the next Road section or directly dried. (5) Since the system without phase change process, always at room temperature, and thus low energy consumption, low running costs. High (6) the degree of process integration, rational layout, to achieve automatic control, on-line monitoring of important process parameters, to keep the system operating conditions, the professional field engineers will provide you with the latest information at any time to provide system maintenance. Nanofiltration applications: (1) Water softening; (3) a high concentration of fruit juice concentrate; concentrated and purified (5) of antibiotics; extract bioactive components (7), and concentrated; (9) wastewater treatment and hydrometallurgy recycling; (11) from the waste acid, alkali, acid recovery. (4) separation of peptides and amino acids;; (2) Isolation and purification of oligosaccharides (6) milk and whey protein concentrate; (8) membrane bioreactor development. (10) dye desalted and concentrated replace salting, acid precipitation;