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How to apply membrane technology in industrial wastewater treatment

water is an important and indispensable source of life for Industry and life. The importance of water is self-evident. At present, with the continuous development of society, people's dependence on water is increasing. With the continuous progress of industrialization and urbanization, China's water pollution problem is becoming increasingly serious, the current situation of water quality shortage is worrying, and the serious shortage of water resources, It greatly restricts the forward development of some advanced cities. At the same time, it also affects the process of China's western development and reduces the reasonable population capacity of China's territory. At present, most rivers in China are facing the phenomenon of eutrophication and drying up, and most cities are facing the phenomenon of water shortage. Coupled with the serious phenomenon of water quality water shortage, it has become the bottleneck of economic development. 75% of lakes are eutrophicated, 90% of urban water pollution is serious, and 60% - 70% of the total water shortage of cities in southern China is caused by water pollution. According to daily experience, drinking polluted water does great harm to human body. It is not only the source of infection of various diseases, but also the benchmark of economic quality. Compared with the harm to gong'e, its harm to agriculture is more direct. Vegetables, fruits and grains in people's lives are planted directly by water resources. Water pollution has further exacerbated the shortage of water resources, further exacerbated the shortage of water resources, and caused economic losses of about 1.5%-3% of GNP. Therefore, the harm of water pollution has become a serious disaster no less than floods and droughts, which has long attracted great attention of the society

II. Introduction to the application of membrane technology in sewage treatment

membrane technology is a new technology developed in recent years. Its application principle is to cultivate and ferment active bacteria with different functions by using modern bioengineering technology and make biofilm, and put it into polluted water, so that the elements that lead to eutrophication can be decomposed and transformed, so as to achieve the purpose of purifying sewage

the process of membrane separation technology is to separate media through selective membrane. In this process, it is necessary to realize the separation, purification and concentration of mixture through external force. At the same time, in the progress of membrane separation, its types are diverse, including not only solid-phase membrane but also gas-phase membrane. The most important part is solid-phase membrane. According to the different driving forces, solid-phase membrane can be divided into electric driven membrane, force driven membrane and thermal driven membrane. In the process of sewage treatment, membrane separation technology rarely needs maintenance, and its simple operation is also welcomed by people. At the same time, it does not need to change the production line in production. Therefore, the use of membrane separation technology has a relative cost advantage, which can reduce the operating pressure of enterprises

III. application status and application prospect of membrane technology

1. Application status of membrane technology

as long as the traditional sewage treatment process is through filtration, distillation, crystallization and other procedures, it consumes relatively high energy. At the same time, in the process of separation, it requires a lot of human, material and financial resources, the separation efficiency is low, and there is a lack of necessary advanced equipment in the traditional sewage treatment technology, The low efficiency of energy utilization leads to heavy pollution, which poses a great hidden danger to the follow-up sewage treatment

in view of this, membrane technology sewage treatment method is recognized by people because of its advantages that traditional technology does not have. From this point of view, it has a relatively broad application prospect. Generally speaking, membrane technology is often applied to the purification of drinking water. As we all know, the impact of drinking water on human body is highly direct, and ensuring the safety of drinking water should become a common concern. Membrane technology plays a very important role in drinking water purification. Through membrane technology, harmful substances such as suspended solids, bacteria and viruses in drinking water can be removed, Through the use of microfiltration, ultrafiltration, nanofiltration technology, it can not only remove the suspended solids, bacteria, viruses and other macromolecules, but also remove some of the hardness, heavy metals and other toxic compounds. Minimize the harm of harmful substances to human body, so as to protect human health and reduce the threat of disease to human body through human immunity

and for storing microorganisms 2. Application prospect of membrane

membrane technology is also used in the corresponding industrial wastewater treatment. In other words, industrial wastewater treatment is another very important application field of membrane technology. As we all know, with the rapid progress of the era of great industry, the random discharge of industrial wastewater has become a common phenomenon, but with the proposal of sustainable strategy, people pay more and more attention to the standard discharge of industrial wastewater, Using membrane technology to purify a large number of harmful substances in wastewater is a sewage purification technology adopted earlier in the United States. American companies took the lead in using electrode coating ultrafiltration technology to treat industrial wastewater. Then, ultrafiltration membrane electrophoresis separation technology is widely used in cleaner production in the automotive industry

(1) the specific application of membrane technology in industrial wastewater treatment

the addition of metals is more common in farmers' market workers. It is a huge water use project, and it is also one of the industries that produce more wastewater. Sometimes, in order to reduce the weight, aluminum alloy and other non-ferrous metals and special metals industries are also adopted. In its production process, a large amount of wastewater is produced, which contains more metal ions, However, most traditional enterprises are talking about removing the excess metal ions. Only in this way can we meet the requirements of sewage discharge and reasonably recover effective things in the production process. The application of membrane technology can easily solve the problems. The content of metal ions is still relatively high when using traditional processing technology for treatment, and the content of metal ions is greatly reduced after using membrane technology for treatment, Through relevant experimental detection, the removal rate of metal sewage with ion concentration of 340 mg/l can reach 99% when using reverse osmosis membrane technology, which shows that the membrane technology is efficient and simple

(2) application of membrane technology in dye wastewater

the dye industry is another huge field of sewage generation. In the sewage treatment of the dye industry, nanofiltration technology is mainly used for sewage purification, which is mainly used in the concentration of dye wastewater and the desalination of crude dyes. The relative molecules of water-soluble dyes are usually, and the scope of application of nanofiltration technology matches it, The dye solution treated by nanofiltration technology can be directly processed into liquid dye products with high added value, high concentration and low salinity or solid powder dye products. The purpose of separation can be achieved by using membrane separation technology to intercept macromolecules, so as to purify harmful substances in sewage. Generally speaking, the treated dye waste will become two different kinds of water, After recycling, the treated wastewater can be returned to the production field and become production water. At the same time, the concentrated liquid produced after treatment also plays a very important role. In the subsequent utilization, the concentrated liquid can be used as production raw material to re-enter the production workshop to measure a small degree, so as to achieve the purpose of cost saving


compared with traditional treatment technology, because membrane production technology has the advantages of convenient operation, simple equipment, energy saving and high separation efficiency, people pay more and more attention to it. From this, we can see that membrane technology has great development potential in the field of wastewater treatment, and the research field is very broad. When using membrane separation technology to treat industrial wastewater, we should adjust measures to local conditions, adjust measures to time, select relatively convenient and fast treatment methods according to the actual situation, ensure that the process design is reasonable, the treatment procedure is compliant, and the treatment result is satisfactory, and ensure the technical feasibility of treating industrial wastewater to the greatest extent, so as to indirectly achieve the goal of national sustainable development and recover and maintain green water and blue sky

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