Because membrane filtration technology has the advantages of high separation efficiency, energy saving, simple equipment and convenient operation, it has great potential in the field of wastewater treatment. However, since industrial wastewater often contains acids, alkalis, oils, etc., and the processing conditions are relatively harsh, the membrane used for treating wastewater must have good material properties, thereby maintaining good separation performance and long use under severe conditions. life. From this point of view, the development of anti-pollution and other excellent filtration membranes has important strategic significance. Due to the complexity of industrial wastewater, the treatment of any single technology often fails to achieve the desired effect. It is necessary to pay attention to the integrated process research of membrane separation technology and other water treatment technologies, and to take advantage of various technologies to form a new process for advanced wastewater treatment.
Membrane filtration technology is a high-efficiency, low-energy and easy-to-operate liquid separation technology. Compared with traditional water treatment methods, it has a good treatment effect, which can realize the recycling of wastewater and the recovery of useful materials. The basic principles and characteristics of membrane separation technologies such as microfiltration, electrodialysis, reverse osmosis, ultrafiltration and nanofiltration are briefly introduced. The membrane technology is introduced in oily wastewater, dye wastewater, papermaking wastewater, heavy metal containing wastewater and high concentration organic wastewater. Progress in applied research in processing. The research direction and development prospects of membrane filtration technology are discussed.
As a new type of separation technology, the membrane separation technology can effectively purify wastewater and recover some useful substances. At the same time, it has the characteristics of energy saving, no phase change, simple equipment and convenient operation. The treatment has been widely used and shows a broad development prospect. It is estimated that the world market for membrane technology in 2000 has reached nearly $2 billion in sales. The membrane separation processes used in wastewater treatment mainly include microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), reverse osmosis (RO) and electrodialysis (ED).