Process for refining super filter and secondary reverse osmosis high purity water

Abstract

The high purity water preparing process includes pre-treatment of raw water in a pre-treating apparatus, reverse osmosis in the first stage of reverse osmosis apparatus and reverse osmosis in the second stage of reverse osmosis apparatus. The pre-treating apparatus is one ultrafiltering device, and the concentrated water from the second stage of reverse osmosis apparatus is back flowed partially to the first stage of high pressure water tank or water inlet and partially to the second stage of high pressure water tank or water inlet. The present invention has pure water product with conductivity of 1 microsiemen / cm and less blocking, high water utilization and other advantages.

Description

technical field [0001] The invention relates to a process for preparing pure water by utilizing ultrafiltration and reverse osmosis membrane treatment. Background technique [0002] At present, the two-stage reverse osmosis method for producing pure water has been widely used in beverage, chemical, electric power, electronics and other industries due to its outstanding advantages such as green environmental protection, fully automatic operation, and stable effluent quality. There are also some shortcomings in the reverse osmosis pure water preparation process. For example, the conductivity of the produced water can only reach 2-10 μs / cm; the utilization rate of the raw water is also low; the raw water pretreatment process in the process is mostly used Fine sand filtration, activated carbon filtration and precision filter filtration, the above-mentioned pretreatment devices are not only bulky, complicated to operate, and expensive to operate, but also ...

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Problems solved by technology

[0002] At present, the two-stage reverse osmosis process for producing pure water has been widely used in beverage, chemical, electric power, electronics and other industries due to its outstanding advantages such as environmental protection, fully automatic operation, and stable effluent quality. However, the existing two-stage reverse osmosis The reverse osmosis pure water preparation process also has some shortcomings. For example, the conductivity of the produced water can only reach 2-10μs / cm; the utilization rate of raw water is also low; most of the raw water pretreatment processes in the process use Fine sand filtration, activated carbon filtration and precision filter filtration, the above pretreatment devices are not only bulky, complicated to operate, and high in operating costs, but also often difficult to achieve the quality of pretreated water when the raw water contains many pollutants and the water quality is poor Requirements, so that the reverse osmosis membrane is easily polluted and the service life is shortened

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