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What are the areas of application for ultrafiltration membranes?

Author: Site Editor     Publish Time: 2022-10-04      Origin: Site


Water Treatment Applications

Drinking water treatment

With the development of the economy and society, the water environment has become more polluted, the water quality has deteriorated, and there are more and more pollutants in the water, especially organic pollutants. The traditional drinking water treatment methods only work on the general organic pollutants, the "two bugs", algae removal effect is not good, and disinfection is easy to produce by-products.

A new generation of drinking water purification process should be in the process of improving efficiency, optimizing the effect of the same time, emphasizing the process without toxic substances, can improve the utilization of resources and energy, reduce the pollution load, improve environmental quality. Ultra-filtration technology can meet the requirements of a new generation of drinking water purification process to remove the "two bugs" in drinking water, viruses, bacteria, algae, aquatic organisms, to protect the safety of drinking water, has been widely used in the United States, Japan and other developed countries in urban water plants.

Ultrafiltration membranes can retain most of the suspended matter and colloids in water, but cannot remove dissolved small molecules, which hinders the application of ultrafiltration technology in drinking water treatment. Currently (2018), many scholars have found that the combined powdered activated carbon (PAC) + ultrafiltration system can transform dissolved small-molecule pollutants into a granular state, which can be removed by the ultrafiltration process.

Other wastewater treatment

Ultrafiltration membrane technology is also used in the treatment of industrial wastewater such as circulating effluent from power plants, cooling circulating effluent from mines, pulp and paper bleaching wastewater and effluent from steel companies.

water treatment

Food applications

The main applications of ultrafiltration membrane technology in food are concentration of fruit juices, clarification, beer production and extraction of nutrients]. Some scholars have used ultrafiltration technology and browning control to produce clarified banana juice. It was found that after microfiltration of pumpkin juice, the membrane flux could reach at least 30.23 L/(m2-h) in a full reflux ultrafiltration test at an operating pressure of 0.3 MPa and an optimum temperature of 35°C by using a polysulfone coiled ultrafiltration membrane with a cut-off relative molecular mass of 50,000, and a clarified and transparent pumpkin juice beverage was obtained. In addition, many scholars have used ultrafiltration technology to extract hesperidin, proteins, polysaccharides, melamine and other substances.

In addition to the extraction of ingredients, ultrafiltration membrane technology can also be used for sterilisation. Some scholars have applied ultrafiltration technology to the sterilisation and clarification of soy sauce, which improved the quality of the product and extended its shelf life.

Pharmaceutical Applications - Drug Separation

Ultrafiltration technology can be used for the separation and refinement, pyrogen removal and sterilization of drugs, especially in the separation and extraction of antibiotics and vitamins. The ultrafiltration/extraction method proposed by some scholars has fundamentally solved the problem of emulsification in the extraction process of antibiotics and improved the extraction yield and product quality.

Currently (2018), the production process often uses activated carbon adsorption to remove pyrogen during the preparation of ginsenoside injection, which has the disadvantages of high loss of total saponin and high production cost. In contrast, the removal of pyrogen during the preparation of ginsenoside injection by ultrafiltration can effectively remove pyrogen and reduce the loss of total ginsenoside, which has the advantages of simplicity, reliability and good results. The use of ultrafiltration to remove bacterial endotoxin produced during rabies vaccine production results in less antigen loss and enriches the sample to meet the requirements of vaccine production.

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