Electroplating washing water zero discharge method

Abstract

The invention relates to a method for realizing zero emission of electro-plating cleaning water; the recovery rate of the treatment of electro-plating cleaning water in the prior art is about 75 percent. The invention proposes a zero emission technique for electro-plating cyanide, chromium compound and / or nickel cleaning water, which adds an ion exchange process to the original discharged concentrate water on the basis of the recovery of RO (reserve osmosis) water through reverse osmosis concentration method, so as to transfer the soluble impurity ions to resins, thus reducing the content of impurity ions in the concentrated water and returning to the RO system for purification; the wastewater generated by the regeneration of resins is membrane vaporized and recycled, thus realizing 'zero emission'. The technical process is scientific and reasonable, which not only avoids dirt blocking and short service life of membrane processing, but also overcomes the problem of too large vaporization energy consumption of direct heating.

Description

technical field [0001] The invention belongs to a technology for comprehensive utilization of electroplating wastewater, in particular to a technology for treating electroplating cleaning water and partially reusing it to realize zero discharge. Background technique [0002] Now, more than 100 countries around the world are short of water. Insufficient water resources have not only become a serious obstacle to the economic development of many countries, but also have threatened human life, health and even life. The ever-increasing crisis of water resources has made people finally wake up: water is not inexhaustible or inexhaustible. We can no longer waste water resources without restraint, but must manage and make good use of this limited and precious water. [0003] The revised "Water Pollution Prevention and Control Law of the People's Republic of China" came into effect on June 1, 2008. The General Office of the State Council forwarded the "Opinions on Strengthening the...

AI Technical Summary

Problems solved by technology

The above-mentioned inventions are very effective in the treatment and reuse of electroplating cleaning water, but there are still some sewage, that is, concentrated water that cannot be reused, being discharged, and the pollution to the water environment cannot be ignored

To achieve "zero discharge", the key is to try to remove soluble impurity ions in water. However, only the method of reverse osmosis concentration will inevitably lead to increased fouling and shortened life of the membrane, and the direct use of heating and evaporation will consume too much energy. The cost is too large to be implemented, which has become a serious problem that has plagued electroplating companies for a long time

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