In foreign countries, its development is as follows: Reid of the United States put forward a reverse osmosis research scheme to obtain cheap fresh water from seawater and brackish water in 1953, and Professor Sourirajan and Leob of the United States developed a new asymmetric membrane in 1960, so RO, as an economical seawater desalination technology, entered the stage of practical application and device research. 1960, Loeb and Zorrila Gold made the first cellulose acetate membrane with high Qualcomm content and high desalination rate, which laid the foundation for the separation technology of reverse osmosis and ultrafiltration membrane. In the same year, Loeb and milstein studied and assembled the first laboratory-scale plate-and-frame reverse osmosis membrane device by using their successfully developed cellulose acetate reverse osmosis membrane.
196 1 year, the manufacturing method of tubular membrane module was put forward for the first time by Hevens company of the United States; 1964, General Atomics developed a spiral reverse osmosis module. 1965, the University of California manufactured a tubular reverse osmosis device for desalination of brackish water with a production capacity of19t/d; 1967, American Dupout company first developed nylon -66 hollow fiber membrane. In 1970, the "PermaseB-9" hollow fiber membrane module with aramid fiber as membrane material was developed, and in 197 1 year, it won the highest prize of Kirkpatfiek's chemical engineering. In the early 1980s, the United States overcame the shortcomings of cellulose materials and developed a composite polyamide membrane with high Qualcomm content and high salt rejection rate, which made reverse osmosis technology widely used in industrial fields.
In the early 1970s, the RO process was used to treat electroplating wastewater, which was first used for the reuse of nickel-plating wastewater, and then used for the treatment of rinsing water and mixed electroplating wastewater such as chromium plating, copper plating and zinc plating. 1965, the patent for treating electrophoretic coating wastewater with semi-permeable membrane was first published in Britain. Since then, American P.P.G Company has put forward the combined technology of ultrafiltration and reverse osmosis to treat electrophoretic coating wastewater, and realized industrialization. 1972-1975 j.porter et al. used dynamic membrane to treat and reuse printing and dyeing wastewater. In 1983, L.Tinghuis and others published the research results of treating dye solution by RO method. 1969, J. C. V Smith of the United States first reported the method of treating urban sewage. In the past 30 years, reverse osmosis (RO) technology has been widely used in industrial water treatment, such as oily wastewater, degreasing wastewater, fiber industry wastewater, paper industry wastewater, radioactive wastewater, brackish water desalination, preparation of pure water and high-purity water, pharmaceutical industry, special chemical process and high-rise building wastewater. Especially in recent years, some new membrane wastewater treatment technologies have come out one after another, such as membrane distillation, liquid membrane, membrane biochemical reactor, controlled release membrane, membrane phase separation, membrane extraction and so on. The research on reverse osmosis in China began with 1965, and reverse osmosis technology has been widely used in China in recent years. At first, reverse osmosis technology was only used for seawater desalination, and then it was gradually extended to desalination of brackish water, food processing, medicine and health, beverage purification, ultra-pure water preparation and so on, which produced high economic benefits.
The development of membrane technology in China began with the study of 1958 ion exchange membrane. 65438-0958 started the research of ion exchange membrane, and carried out the experimental research on desalination of seawater by electrodialysis. 1965 exploration of reverse osmosis membrane, 1966 polyethylene heterogeneous ion exchange membrane was put into production in Shanghai chemical plant, which laid the foundation for the industrial application of electrodialysis. 1967 the battle of seawater desalination has played a positive role in promoting the progress of membrane science and technology in China. Electrodialysis, reverse osmosis, ultrafiltration, microfiltration membrane and its components were successively developed in the 1970s, and entered the stage of popularization and application in the 1980s. From 65438 to the mid-1980s, great progress has been made in the research of gas separation membranes in China. 1985 The hollow fiber N2/H2 separator was successfully developed for the first time by Dalian Institute of Chemical Engineering, China Academy of Sciences, and its main performance indexes are close to those of similar foreign products. Now it has been put into mass production, and the cost of each set is only 1/3 of that of imported devices. Since 1990s, great progress has been made in the preparation of composite membranes.
Han Shi is the only company in the world that has both reverse osmosis membrane production technology and RO direct drinking machine production technology, and has obtained Japanese JHP certification, American FDA certification, China Han Shi CCC certification, China Ministry of Health MA approval, and the environmental and health industry development contribution award jointly awarded by the State Environmental Protection Administration, China People, Ministry of Health and AQSIQ. The company's business development benefits from the good cooperation foundation with overseas customers, and has made rapid development in the application field of membrane separation technology. At present, Han Shi has seven water treatment technologies, including reverse osmosis membrane separation technology, microfiltration membrane separation technology, ultrafiltration membrane separation technology, nanofiltration technology, ion exchange technology, EDI continuous electric desalination technology and MBR membrane bioreactor, with 2/kloc-0 single and series products, covering electro-optics, semiconductors, precision processing, energy development, fine chemicals, biomedicine, textile printing and dyeing, seawater/brackish water desalination, food and beverage. Han Shi membrane is widely used, and its water treatment equipment mainly includes reverse osmosis pure water machine, ion exchange equipment, ultrapure water equipment, pharmaceutical purified water equipment, ultrafiltration equipment, continuous electric desalination system, seawater desalination equipment, drinking water purification equipment and other complete sets of equipment.