Among many membrane separation technologies, reverse osmosis equipment has been a relatively successful, rapidly developing, and widely used technology in China in recent years. It is estimated that the usage of reverse osmosis membranes has increased by an average of 20% since 1995; According to conservative statistics, the market supply of industrial reverse osmosis membrane components in 1999 was 6000 8-inch membranes and 26000 4-inch membranes. In 2000 and 2001, the market was relatively strong, and the membrane volume increased year by year. According to calculations, the application of reverse osmosis technology has created an annual output value of over 1 billion yuan for the water treatment industry.

The industrial application of reverse osmosis membranes in China is still mainly focused on large boiler feed water and many industrial pure water, followed by the drinking water market. The application areas include electronics, semiconductors, pharmaceuticals, food, beverages, wine, chemical and other industries, which have also formed a scale.

Due to the advantages of saving electricity consumption and reducing the pressure level of related mechanical components, the application proportion of low-pressure membranes has been continuously increasing since 1999, and has performed well in small devices mainly composed of 4-inch membranes. The application of low-pressure membranes in large equipment is also on the rise. At present, the production capacity of reverse osmosis equipment is 650 tons/hour.

Low fouling membrane fouling is a major hazard in reverse osmosis applications. At present, there are several types of low pollution membranes that have strong anti pollution performance, long usage time, low cleaning frequency, and convenient cleaning.

Negative charge, currently film manufacturers have developed low-voltage composite films with positive surface charges, mainly used for preparing high resistivity and high-purity water systems. The positive charge film ES10c produced by Nikko Electric in Japan has achieved high purity water with a resistivity of 10-15 megaohms in the three-level reverse osmosis system of the semiconductor industry; The electrical resistivity of the three-stage reverse osmosis system with a final production capacity of 800 tons/hour at three factories of Hyundai Electronics in South Korea is 8-9 megaohms; The 170 ton/hour three-level reverse osmosis system of a semiconductor factory in Shanghai has also met the above indicator standards. In addition, several pharmaceutical factories in China have achieved a two-stage reverse osmosis system with a scale of 5-20t/h and a water and electricity resistance rate of 1.7-3 megaohms.

Ordinary water treatment uses high-temperature resistant, food grade, and hygiene grade reverse osmosis membranes, with temperatures between 0-45 ℃. However, reverse osmosis membranes that are resistant to high temperatures and chemical corrosion can be used in special situations that require high temperature resistance of 90 ℃. In addition, many food grade or hygiene grade reverse osmosis equipment with unique membrane element structures have also begun to be used in China.

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