China's new Sanitary Standard for Drinking Water has been implemented since July 1 last year, and the number of indicators has been increased from 35 to 106. At the “2008 Urban Water Industry Strategy Forum†that ended on April 2nd, Li Guibai, an academician of the Chinese Academy of Engineering and professor at Harbin Institute of Technology, said that through innovation and cost reduction, membrane filtration technology has reached a point where it can be widely promoted and can be better Safeguard China's drinking water safety.
Li Guibai said that the ultrafiltration pore size of the membrane is about several nanometers, while the microbial virus in water is about 20 nanometers, the bacteria is about several hundred nanometers, and the protozoa and algae are several micrometers. Through the membrane filtration technology, the microbial virus can be better. Bacteria, etc., are filtered out, and the price of domestic ultrafiltration membranes has dropped drastically to the degree that they can be widely promoted in the market. Therefore, the choice of ultrafiltration membrane to improve the safety of drinking water is a more feasible solution.
Li Guibai said that in the face of toxic organic trace pollutants, membrane filtration technology has a poor removal effect. Before the membrane filtration, the granular carbon and powdered carbon segments can be added. This will not only give full play to the physical adsorption of carbon, but also enhance the biodegradability through the growth of microorganisms.
Wang Tongchun, vice president of Sino-Netherlands Water Investment Group, said that if traditional technologies are used to meet China's new drinking water quality standards, complex technologies and engineering changes will be required, operations will become more difficult and costs will increase; currently, ultrafiltration membrane technology It has matured and its application scale has reached hundreds of thousands of tons per day, and the comprehensive operating cost is lower. Compared with the traditional technology, membrane filtration technology is superior.
Suzhou has established an ultrafiltration membrane water plant with a daily output of 10,000 tons of water. The construction cost is about 300 yuan per cubic meter, and the operating cost is 0.0782 yuan per cubic meter, which is roughly equivalent to the cost of tap water produced by traditional processes. China is brewing and constructing a large-scale ultrafiltration membrane water plant with daily output of over 100,000 tons. Membrane filtration technology has also developed rapidly in foreign countries. In 2006, it used this technology to treat about 8 million cubic meters of water daily.
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