图片名称

Application of Membrane Technology in Water Purification

Time:

2022-03-21 10:39


introduction

After the reform and opening up, my country's economic level has been greatly improved, but it is opposite to the increasingly serious environmental problems, among which the water environment problem has attracted the attention of most people. At present, the prevention and control of water environment pollution mainly adopts membrane technology. Compared with traditional water purification technology, membrane technology has higher efficiency, stronger practicability and better effect in the in-depth treatment of water quality. Membrane technology has a good development prospect in the field of water purification, so a sufficient understanding of the technology should be carried out. The importance of the application of membrane technology in the field of water purification is discussed, and its development trend is discussed.

1 Current status of water purification treatment

At present, more than 90% of tap water treatment methods in my country are conventional coagulation, sedimentation, filtration and chlorination disinfection. This method was implemented at the beginning of the last century. Its main purpose is to remove bacteria in water and reduce water turbidity. The effect of removing organic matter is not ideal, especially in the treatment of dissolved organic matter, it can only achieve less than 30% of the treatment effect. In many cities, the water pipeline network is very old, which will cause secondary pollution to the factory water and increase the content of harmful substances and bacteria in the tap water. After investigation and testing, the qualified rate of domestic water is less than 80%. Water pollution accidents caused by the pollution of the water pipe network frequently occur. As people's health is seriously threatened by water pollution, people are more and more aware of the importance of water safety. Many families have installed water purification equipment in order to drink safe tap water. Microporous ceramic filter element purification, activated carbon filtration and membrane separation and filtration methods are the main water purification methods adopted by water purifiers currently in the sales stage in my country. Among these technologies, membrane separation technology occupies the mainstream position.

2 Membrane Technology Overview

2.1 Basic Concepts of Membrane Technology

Membrane technology is developed by combining biology and physics. It uses the principle of biological cell membrane to selectively permeate the substances on both sides of the cell membrane. The use of membrane technology is generally made of separable materials. The membrane has special physical properties, which can filter out harmful substances or impurities in water, so as to achieve the purpose of purifying water resources. Membrane technology has many advantages such as high efficiency and environmental protection. It does not need to use any chemicals in the process of purifying water resources, and can purify water resources through the osmosis of membranes.

2.2 Necessity analysis of the application of membrane technology in water purification

With the deterioration of environmental pollution, freshwater resources are also polluted to a certain extent, and the quality of water environment is gradually declining. In order to ensure the health of people's drinking water, it is necessary to strengthen the use of membrane technology to treat water resources. Membrane technology can purify water resources such as seawater and bitter alkali water precisely, efficiently and environmentally. In water treatment, the problem of water use is alleviated to the greatest extent.

3 Application of membrane technology in water purification

3.1 Application of membrane technology in water treatment

Compared with traditional water purification technology, membrane technology does not need to deal with sludge, which can reduce the amount of coagulant used. In addition, the operation is very simple, the cost input is relatively low, the efficiency is very high, and it is more environmentally friendly and energy-saving. Suspended particles, bacteria and some viruses in water can be removed by microfiltration technology, some ions can be intercepted by nanofiltration technology, and some macromolecular organic substances can be treated by ultrafiltration technology.

3.2 Application of reverse osmosis membrane in drinking water treatment

Reverse osmosis technology is the most widely used in the process of membrane treatment technology, especially in the process of drinking water purification. The reverse osmosis technology mainly works through the selective permeability of the semi-permeable membrane, because the liquid concentrations at both ends of the semi-permeable membrane are different, and because of the effect of osmotic pressure, it tends to permeate to the place where the osmotic pressure is relatively high. Apply corresponding pressure to the solvent with high osmotic pressure. The effect of reverse osmosis is that the solution gradually flows to the side with lower concentration. It is used in water purification treatment through reverse osmosis membrane. People only need to pressurize the method. water. The reverse osmosis membrane can realize the desalination of seawater, that is, the seawater can gradually become water that people can drink directly. In the traditional water purification process, the chemical degradation treatment method is time-consuming and labor-intensive, and the advanced nature of reverse osmosis membranes is evident. In the process of treating water resources, it is healthier to treat drinking water through ultra-low pressure reverse osmosis membranes, and it can also improve the nutritional value of water through mineralization and other methods. For details, please contact Shuibao or refer to http://www.dowater.com for more related technical documents.

3.3 Application of membrane technology in the treatment of heavy metal wastewater

Washing water for plating parts in electroplating plants, dust removal and drainage in non-ferrous metal smelting process, drenching water in waste rock yard, and drainage of tailings in concentrators are all heavy metal wastewater. If water resources are polluted by heavy metals, biological methods cannot help It can be degraded very well. In addition, these poisons can be hidden for a long time, which will cause great harm to the nearby environment. The general method is the neutralization and precipitation method, which is difficult to meet the discharge requirements. Membrane separation technology can effectively extract heavy metal elements in wastewater from concentrated wastewater. After treatment by membrane separation technology, two effects can be obtained: first, the wastewater can be treated to meet the discharge standard, and secondly, the permeate can be recovered. of heavy metal elements.

3.4 Application of membrane technology in the treatment of papermaking wastewater

In the process of papermaking, a lot of water needs to be used, and a lot of waste water will also be generated, which will seriously affect the surrounding environment. In the process of waste water purification, lignin, sulfonate, etc. can be effectively recovered and concentrated through membrane separation technology. The temperature of the waste water discharged from papermaking is very high, and the pH value range is very wide, so it is necessary to pay attention to select some resistant Chemicals, temperature-resistant polymer membranes, such as polysulfone amide and UF membranes made of polysulfone and some polymers.

4 Development status of membrane technology in water purification

The use of membrane technology to treat water resources can be widely used in various water resources treatment, greatly speed up the treatment efficiency of water resources, improve the treatment effect, and completely treat the harmful inorganic and organic substances in the water. Membrane technology can be combined with traditional water purification technology. Membrane technology can be used as the first process of water resources treatment to minimize harmful substances in water resources, and then carry out subsequent purification operations. Although membrane technology has many advantages, the cost of use is also higher than other water purification technologies. With the progress of technology, the repeated use of membrane materials should be gradually realized, the cost of use should be reduced, and the use of large-scale promotion should be carried out.

4.1 Improve membrane performance

At present, membrane technology is a new type of technology with a short development time, so some performances of membranes are not very good, and the separation effect is not very good in water quality treatment. Therefore, the relevant technical personnel should use new technology to continuously improve the membrane structure, so as to improve the membrane performance and optimize the separation effect.

4.2 Improve the application level of membrane technology

With the application of membrane technology in water purification, we should focus on improving the application level of membrane technology in the future. Only by improving the membrane technology, can the application of membrane technology be further enhanced in the water treatment, and the water quality effect can be further improved.

4.3 Pay attention to the manufacturing process of membrane materials

At present, membrane technology has a good development prospect in water purification treatment. Therefore, we should pay enough attention to the manufacturing process of membrane materials, take the advanced manufacturing methods of membrane materials at home and abroad as a reference, and then make improvements based on the specific domestic conditions. Conclusion: Membrane technology is an emerging water purification technology. In the process of water purification treatment, the market prospect is extremely obvious, which can solve the problem of water pollution. From the current point of view, it is necessary to strengthen the research of membrane technology, so that the advantages of membrane technology separation can be further exerted, and separation membranes with better performance can be produced.

Epilogue

I analyze the current status of water purification, the overview of membrane technology, the application of membrane technology in water purification and the development of membrane technology in water purification. (Source: Architectural Simulation Author: Ji Tengfei)