Electroplating washing water zero discharge method

A technology for cleaning water and zero discharge, applied in the electrolysis process, electrolysis components, cells, etc., can solve the problems of difficult implementation, high cost, shortened life, etc., and achieve the effect of solving the waste of resources

Inactive Publication Date: 2009-03-25
海宁市海整整流器有限公司
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  • Application Information

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

Method used

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  • Electroplating washing water zero discharge method
  • Electroplating washing water zero discharge method
  • Electroplating washing water zero discharge method

Examples

Experimental program
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Example Embodiment

[0037] Example 1:

[0038] likefigure 1 shown, adding Cr by weight to the chrome-containing wash water 6+ 3.5 times the sodium metabisulfite, in which the Cr 6+ reduced to Cr 3+ ; Then filter with lamination filter to remove impurities with larger particles; then filter with PP filter element to remove tiny particles above 5μ; then pressurize with high-pressure pump to make the pressure greater than osmotic pressure, enter reverse osmosis Treatment, reverse osmosis treatment uses a neutral anti-pollution reverse osmosis membrane to remove the metal ions in it to generate RO water; finally, the pH value of the RO water is adjusted to 6.8 with sodium hydroxide, which is the reuse water. After testing, its conductivity is 125μ, and the salt rejection rate is 95%. This recycled water is used in the electroplating cleaning process and can replace clean tap water.

[0039] The concentrated water produced by the reverse osmosis treatment is neutralized with sodium hydroxide to ad...

Example Embodiment

[0040] Example 2:

[0041] A factory discharges 40 tons of nickel-containing wastewater per day. The processing of this factory is mainly based on hanging plating, and its wastewater contains nickel in the range of 30ppm to 80ppm. After pretreatment, such as figure 2 As shown in the figure, a bag filter with a 50 μm pore size and a security filter with a 5 μm pore size are used for filtration, and then reverse osmosis treatment is performed, and secondary concentration is used. Add 30% soda ash solution to the concentrated solution, stir while adding, and adjust the pH to 8-8.5. At this time, nickel is all precipitated in the form of nickel carbonate; it is precipitated in the inclined tube sedimentation tank, and the supernatant is passed through the anion resin exchange column and The cation resin exchange column is returned to the RO system. The anion exchange resin and the cation exchange resin are regenerated with 8% sodium hydroxide and 8% hydrochloric acid respective...

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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...

Claims

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Application Information

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IPC IPC(8): C25D21/20C25D21/22
Inventor 钱克邦
Owner 海宁市海整整流器有限公司
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