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      HOME | 中文版 | ENGLISH
      Membrane separation technology application in water treatment

      1, introduction

      Water is vital to the survival of humans natural resources. Global water environment quality worsened and the rapid development of economy, the urgent requirement of wastewater reuse for the development of The Times, to alleviate technology of water shortage, water shortages has become the bottleneck of restricting social development. Therefore, in recent years various new, improved the efficiency of wastewater treatment technology arises at the historic moment. Among them, the membrane technology to its high efficiency, energy-saving, equipment is simple, the operation is convenient wait for a characteristic, the application in water treatment field, more and more widely. For instance in 2008, Beijing will carry out the green Olympics of several measures are applied to film technology. Foreign experts put membrane technology development called "the third industrial revolution" in the 21st century, as one of the most promising new technologies.

      2, the working principle of the membrane separation technology is to use membrane separation technology, is a special manufacturing, have a choice in the film, permeability under external force pushes separation and purification of mixture and concentrated on a new separation technique is based on the physical properties of different mixture with the method of the sieve of separation, or a mixture of different chemical properties according to separate matter. Material through the membrane speed (dissolution rate) depends on the speed and enter into film membrane surface spread to membrane longan, another surface speed (diffusion speed). And dissolution rate depends entirely on be separated in membrane materials, chemical properties of the differences between the diffusion speed except chemical properties with material molecular weight related, with greater speed, the time required through film the shorter mixture through various components, the speed of the membrane separation efficiency difference is higher.

      Three, membrane separation technology application in water treatment

      3.1 membrane separation technology of urban sewage treatment in the application of the depth of urban sewage treatment and reuse the depth began in the 1960s. Urban sewage large quantity, centralized, with the characteristics of water quality more stable, is a potential water. Urban sewage treatment usually in sewage treatment plant, the depth of the secondary or tertiary emissions for water, with liquid reverse osmosis (RO) desalination to it and the final, take off a COD, BOD and trace of organic matter and heavy metal ions removal of effluent can achieve standards for drinking water. But for some reason, at present mostly subjective isn't directly used for drinking water. Foreign often inject aquifers or freshwater reservoir with natural purification (usually need to deposit two years), also have used for industrial cooling water, boiler water etc non-potable purpose. Urban water restricts the development of economy, the urban secondary effluent process the regeneration recycling is one way to overcome shortages. Secondary emission liquid into RO device in prior to make preprocessing of incoming water the use requirement with RO device. Pretreatment quality is RO technology application key of success or failure. Now, RO before the pretreatment of using MF or UF depth of water treatment process has become the direct drinking water reuse of wastewater treatment project of urban industry standards, domestic and foreign are aggressively adopting the large-scale membrane technology for the new urban sewage water resources development. Our country adopts "micro flocculation fiber filtration membrane filter" on bath wastewater are studied, test shows that this technique has water stability, cover an area of an area small features. Tianjin economic and technological development zone sewage treatment plant introduce Norway SBR sequencing batch type activated sludge advanced technology, everyday can provide 10 tons of secondary biochemical treatment, sewage water as water recycle deep treatment possible. After China's urban sewage reuse is not popular, regeneration of deep treatment of membrane technology in relatively rarely used, in the future, we still need in the sewage processing renewable reuse and depth.

      3.2 membrane separation technology application in industrial wastewater treatment due to the development of industry, a lot of industrial wastewater into a water body, these industrial waste water, wide amount and deep, mostly contain different harm concentration of chemical substances, some of which has high economic value, while others are toxic, harmful to human environment. To protect the environment from pollution, and recycled material, and in the industrial wastewater useful emissions must be carried out before purification processing, membrane separation technology can effectively of industrial waste water purification, and can reuse the useful substances, still can save energy. Membrane technology in processing electroplating wastewater, papermaking wastewater, heavy metal waste water, oily wastewater and printing and dyeing wastewater this five categories from industrial wastewater drained have been widely used.

      3.3 membrane separation technology application in water treatment with the improvement of people's living standard, the water for drinking water and higher demand, plus some defects of traditional craft, such as plus chlorine sterilization will make some of the organic chlorine and water the reactions that produce a new hazard huge three cause (carcinogenic, cause mutation, teratogenic variable) compounds. Membrane technology used for drinking water treatment is a major breakthrough. Purification of water and purified water removal from suspending solid, bacteria, viruses, inorganic, pesticides, organic matter and dissolved gas, etc, in this respect, membrane separation technology play a unique role. The microfiltration membrane separation, ultrafiltration and nanofiltration consisting of water treatment method to remove water, the micron-grade particles superior than conventional water treatment technology of filtering ability, but also has the removal filter doesn't have the ability of nanoscale particles can effectively remove the water, the suspended, bacteria, viruses, inorganic, pesticides, organic matter and the impurities such as gases dissolved. Comply with the requirements of drinking water don't improve.

      3.4 membrane separation technology in our country is the application of desalination water largest, as well as water poor country. Seawater as an important part of water resources to effectively make use of water crisis in China is to one of the important measures. Currently used for desalination are mainly the reverse osmosis membrane technology, electricity penetration (ED) and membrane distillation (MD), etc. In 2002, tons of sea water desalination and for technology industrialization demonstration project was listed in the national high technology industry development programs. Seawater desalination with hair osmosis membrane desalination rate as high as 99.6%. Reverse osmosis technology's appearance and development greatly reduced the cost of desalination, now reverse osmosis has become the most economic drinking water desalination means of preparation. Electrodialysis technology can directly for drinking water desalination, but the process without charge for the matter, such as organic material, colloid, bacteria, without removing ability, and such high energy, water recovery is low. So, with the sea water desalination technology appear, the proportion of desalination electrodialysis method is gradually reduced. Membrane distillation technology with high desalination rate, can achieve 99.7% above, be used to small seawater desalination, ion, colloid, macromolecules non-volatile components such as diffusion through the membrane and not to the interception of components and equipment is 100%, simple, easy operation, long service life and energy consumption membrane advantages.

      3.5 membrane separation technology in the application of md desalting in western China provinces severe water problem in China, particularly prominent in this water country md desalination in China is to a water shortage in western provinces effective ways. At present, md film for desalination technology mainly has: electrodialysis technology, reverse osmosis technology, nanofiltration technology. Almost all our western oilfield with electrodialysis legal take living and drinking water. Electrodialysis cannot purify water organic matter and bacteria, equipment operation, this make its large energy consumption in the application of md desalination is restricted. Md usable also level of reverse osmosis device desalting drinking water. Reverse osmosis system desalt md in China, the effluent water better than the hygienic standard. To contain the GaoFu, low salinity through reverse-osmosis desalination md, effluent can achieve our drinking water hygiene standards. Reverse osmosis method than electrical chromatography, no pollution, low production cost is the most economic md desalination way. Nanofiltration is a low pressure reverse osmosis technology, under lower pressure has higher desalination performance. In particular, especially md solute characterization of ion, has the very good desalination effect. More on the eastern provinces md, nanofiltration will be effective ways of producing high-quality drinking water.

      4, problems and prospects of 21st century membrane separation technology is the most potential one of the high and new technology, but there still exist membrane module with high price membrane pollution problems. Membrane module with high price of membrane fouling restricted the membrane separation technology the wide application in wastewater treatment. Although after 40 years of exploration and development, China's current separation membrane varieties were rare, performance low, the specification is not complete, and our market is used on most of the membrane group were imported from abroad, membrane materials are from abroad, the depth and scope of application with developed countries in the world there is a certain distance. Therefore, we must rush, speeding up development of our film industry. The membrane separation technology to applied to wider application fields. To strengthen the high-performance membrane module and the development, in order to replace imported as soon as possible for membrane group. If can use natural substances or biological material preparation various new film, is both economical and can eliminate the threat of secondary pollution. Must strengthen will film processing technology combined with other treatment process, make full use of the advantage of technology, forming a new process of wastewater treatment. As can be expected, along with the membrane material improvement and perfection of the film process, in the 21st century, our film industry and membrane water treatment technology will appear the development by leaps and bounds, and application will enter a new climax, especially in improving the drinking water quality, seawater and md, industrial water and desalination preparation, the water pollution control high pure water, wastewater recycling, etc will get more quickly the more comprehensive development.

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      亚洲同志GV钙片在线观看
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