Method for treating reverse osmosis concentrated water

Abstract

The invention discloses an up-to-standard treatment method for concentrated water obtained after up-to-standard biochemical sewage is treated by a pretreatment and reverse osmosis system. The concentrated water obtained after the up-to-standard biochemical sewage is treated by the reverse osmosis system enters a selective nanofiltration membrane system through a high-pressure pump; after the concentrated water is treated by a nanofiltration membrane, when the total hardness of a concentrated solution is more than 1,000mg / L (based on CaCO3), the concentrated solution is needed to be subjected to hardness removal and refluxed to a biochemical tank of a sewage treatment factory, or refluxed to an anaerobic reaction tank if the anaerobic reaction tank is provided; when the total hardness of the concentrated solution is less than 1,000mg / L (based on CaCO3), the concentrated solution can be directly refluxed to the biochemical tank of the sewage treatment factory, or refluxed to the anaerobic reaction tank if the anaerobic reaction tank is provided; and produced water can be directly discharged after reaching the standard and can be recycled to a target unit according to the requirement. The method is simple, convenient and effective, salt and organic matters are reduced to a certain extent, and the aim of up-to-standard discharge, water conservation and emission reduction are fulfilled.

Description

technical field [0001] The invention relates to a treatment method for reverse osmosis concentrated water, in particular to a standard-reaching treatment method for reverse osmosis concentrated water discharged after reusing biochemical standard sewage. Background technique [0002] "Energy saving and emission reduction" has become an important and urgent task of my country's current economic and social development, and water saving is the most important, and has been included in the important indicators of enterprise development by various large water-consuming enterprises. [0003] Using reverse osmosis technology to treat and reuse biochemical standard wastewater is an important technical means for enterprises to save water and reduce emissions. However, reverse osmosis concentrated water cannot be discharged up to standard, which affects the application of reverse osmosis technology in the field of wastewater reuse. [0004] At present, some treatment methods have been d...

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Problems solved by technology

[0003] The use of reverse osmosis technology to treat and reuse biochemical standard wastewater is an important technical means for enterprises to achieve water saving and emission reduction. However, reverse osmosis concentrated water cannot be discharged up to standard, which affects the application of reverse osmosis technology in the field of wastewater reuse.

[0004] At present, some treatment methods have been developed for reverse osmosis concentrated water. The concentrated water is further concentrated. Some reverse osmosis concentrated water is filtered and treated by reverse osmosis; Concentrated water is treated with reverse osmosis, these methods still have concentrated water discharge, facing the problem of not being able to meet the standard

There is also the removal of organic matter. After the reverse osmosis concentrated water is filtered, it is treated with ozone oxidation technology, and the content of organic matter in the concentrated water is effectively reduced. Although the organic matter meets the standard, there is no reduction in salt, and there is no reduction in salt discharge. Restricted areas still cannot meet emission standards, and the treatment cost is relatively high

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