Sinochem Xinnet's current membrane technology has become an important force in the water treatment industry, and over 90% of China's membrane materials are also used for water treatment. However, the reporter learned from an interview last week that although water treatment has entered the “film era,†many experts pointed out that the magical membrane technology can only be combined with the traditional process to improve its function and overcome cost.
Urban domestic sewage and industrial sewage are the top priorities of the “Twelfth Five-Year Plan†environmental protection work. The "12th Five-Year Plan" of the "Energy Conservation and Environmental Protection Industry Development" specifies the specific scale targets for sewage treatment and solid waste treatment in the next five years. By 2015, the national daily treatment scale of new sewage will reach 90 million tons, which is higher than the "Eleventh Five-Year Plan". Doubled, upgraded 50 million tons of sewage treatment scale. In the selection of technical routes, membrane technology is the established direction.
Zhang Baiqing, the director of the Department of Water Quality Engineering of Wuhan University, who is the chief editor of the "Fully Membrane Water Treatment Technology" book, told reporters that microfiltration, ultrafiltration, reverse osmosis and electric desalination are the four most commonly used membrane separation technologies in the field of water treatment. Compared with traditional coagulation, clarification, filtration and other technologies, it has many advantages. The problem of water pollution in China is very prominent and the composition of sewage is complicated. In practical projects, traditional techniques alone cannot solve the problem. The use of membrane separation technology helps to design a diverse and perfect water treatment system. However, he also pointed out that the full-membrane water treatment process, which is completely dependent on membrane technology in water treatment, including the combination of ultrafiltration, microfiltration, reverse osmosis, electrodeionization, and other membrane processes, is difficult to achieve in production. The use of pharmaceuticals, etc. is inevitable. For example, intractable coking wastewater and the like also require biochemical treatment.
Zhou Baiqing believes that the development trend of water treatment technology is the intersection and integration of new and old technologies, so as to achieve strengths and avoid weaknesses. For example, he said that the organic waste water has a complex composition, high concentration and salt content, large color and toxicity, and some are also substances that are difficult to biodegrade, especially the "triple causes" (carcinogenic, teratogenic, and Mutation) Organic pollutants, even if the concentration in the water is less than 1×10-9, can still seriously endanger human health. It is difficult to achieve effluent standard discharge by a single treatment process, and existing processes must be integrated. .
Many experts have stated that it is necessary to treat the membrane technology dialectically: on the one hand, it does have advanced nature; on the other hand, it should also be integrated with other technologies, and traditional water treatment processes are still very useful.
Huang Huayao, director of the Xuzhou Institute of Water Treatment, believes that membrane technology, despite the harsh application conditions, such as the requirement for particle diameters in water, is not more than 5 micron, but it has the most advantage for sewage treatment with high salinity, and as of now there is no other better The way to deal with high salt water. However, he also pointed out that the membrane method does not save water. He also stated that sewage treatment is a systematic project and that there must be a systematic approach and there is no universal technology. A variety of processing technologies have their own advantages and disadvantages, and only when the combined application technology content is higher, the treatment plan is more complete.
Ren Qingchun, chairman of Beijing Ziguang Yitian Environmental Engineering Technology Co., Ltd., further introduced to the reporter that reverse osmosis membranes dominate the water treatment, and the theoretical water recovery rate is 75%. According to the survey results of hundreds of users across the country, in the actual operation, the product rate of desalinated water is only 55% to 60%, and only 40% of the waste water is only used in coal plants for spraying or other purposes. Some are still drained. Some users feel bad about 40% of this waste water, in order to increase the recycling rate, and reinvest to add a reverse osmosis device to recover it, but still nearly 20% of the concentrated water is drained. Ren Qingchun told reporters that at present, there is no more economical and applicable technology for zero discharge of corporate wastewater. If membrane technology is used, the treatment cost per ton of water is as high as about 7 yuan, which is not economical.
Zero discharge of sewage requires efficient removal of pollutants and deep desalination. In view of the high cost of membrane technology, high water quality requirements, and poor stability of system operation, experts agreed that membrane technology must be economically integrated and need to be combined with traditional treatment processes to solve the problem of deep water reuse. Realize the recycling of water resources.
Urban domestic sewage and industrial sewage are the top priorities of the “Twelfth Five-Year Plan†environmental protection work. The "12th Five-Year Plan" of the "Energy Conservation and Environmental Protection Industry Development" specifies the specific scale targets for sewage treatment and solid waste treatment in the next five years. By 2015, the national daily treatment scale of new sewage will reach 90 million tons, which is higher than the "Eleventh Five-Year Plan". Doubled, upgraded 50 million tons of sewage treatment scale. In the selection of technical routes, membrane technology is the established direction.
Zhang Baiqing, the director of the Department of Water Quality Engineering of Wuhan University, who is the chief editor of the "Fully Membrane Water Treatment Technology" book, told reporters that microfiltration, ultrafiltration, reverse osmosis and electric desalination are the four most commonly used membrane separation technologies in the field of water treatment. Compared with traditional coagulation, clarification, filtration and other technologies, it has many advantages. The problem of water pollution in China is very prominent and the composition of sewage is complicated. In practical projects, traditional techniques alone cannot solve the problem. The use of membrane separation technology helps to design a diverse and perfect water treatment system. However, he also pointed out that the full-membrane water treatment process, which is completely dependent on membrane technology in water treatment, including the combination of ultrafiltration, microfiltration, reverse osmosis, electrodeionization, and other membrane processes, is difficult to achieve in production. The use of pharmaceuticals, etc. is inevitable. For example, intractable coking wastewater and the like also require biochemical treatment.
Zhou Baiqing believes that the development trend of water treatment technology is the intersection and integration of new and old technologies, so as to achieve strengths and avoid weaknesses. For example, he said that the organic waste water has a complex composition, high concentration and salt content, large color and toxicity, and some are also substances that are difficult to biodegrade, especially the "triple causes" (carcinogenic, teratogenic, and Mutation) Organic pollutants, even if the concentration in the water is less than 1×10-9, can still seriously endanger human health. It is difficult to achieve effluent standard discharge by a single treatment process, and existing processes must be integrated. .
Many experts have stated that it is necessary to treat the membrane technology dialectically: on the one hand, it does have advanced nature; on the other hand, it should also be integrated with other technologies, and traditional water treatment processes are still very useful.
Huang Huayao, director of the Xuzhou Institute of Water Treatment, believes that membrane technology, despite the harsh application conditions, such as the requirement for particle diameters in water, is not more than 5 micron, but it has the most advantage for sewage treatment with high salinity, and as of now there is no other better The way to deal with high salt water. However, he also pointed out that the membrane method does not save water. He also stated that sewage treatment is a systematic project and that there must be a systematic approach and there is no universal technology. A variety of processing technologies have their own advantages and disadvantages, and only when the combined application technology content is higher, the treatment plan is more complete.
Ren Qingchun, chairman of Beijing Ziguang Yitian Environmental Engineering Technology Co., Ltd., further introduced to the reporter that reverse osmosis membranes dominate the water treatment, and the theoretical water recovery rate is 75%. According to the survey results of hundreds of users across the country, in the actual operation, the product rate of desalinated water is only 55% to 60%, and only 40% of the waste water is only used in coal plants for spraying or other purposes. Some are still drained. Some users feel bad about 40% of this waste water, in order to increase the recycling rate, and reinvest to add a reverse osmosis device to recover it, but still nearly 20% of the concentrated water is drained. Ren Qingchun told reporters that at present, there is no more economical and applicable technology for zero discharge of corporate wastewater. If membrane technology is used, the treatment cost per ton of water is as high as about 7 yuan, which is not economical.
Zero discharge of sewage requires efficient removal of pollutants and deep desalination. In view of the high cost of membrane technology, high water quality requirements, and poor stability of system operation, experts agreed that membrane technology must be economically integrated and need to be combined with traditional treatment processes to solve the problem of deep water reuse. Realize the recycling of water resources.
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