Electroplating wastewater treatment equipment Wastewater treatment method
Adjust the pH of pickling wastewater to 6~9 with sodium hydroxide solution, and aerate it through air for 2~12 hours. After the precipitation is removed, the electroplating wastewater zero discharge clear solution removes metal cations through adsorption of hydrogen strong acid cation exchange resin, and then concentrates and recovers low salt water through reverse osmosis device; The regeneration liquid of hydrogen strong acid cation exchange resin is delivered to the acid dissolving tank.
The concentrated high salt water of the reverse osmosis device is absorbed by chelating resin and activated carbon, evaporated and concentrated into solid after pH adjustment and flocculation treatment, forming harmless solid, and the condensed water is recycled, or the high salt water is treated by chelating ion exchange resin, and directly discharged into wastewater COD through ultraviolet photocatalytic oxidation; The pH of cyanide containing wastewater shall be controlled within 7~10.
The anion exchange resin treated by the meridian anion is used to remove the cyanide ion in the wastewater, and then the cation exchange resin is used to absorb and remove the copper and zinc ions in the wastewater, enter the reverse osmosis system, and use the low salt water for recycling. High salt water removes heavy metal ions through chelating ion exchange resin, evaporates and concentrates into solid after pH adjustment and flocculation, forming harmless solid impurities.
The condensed water is recycled, or the high salt water is treated by chelating ion exchange resin and then directly discharged into COD through ultraviolet photocatalytic oxidation; After the anion exchange resin is saturated, it is regenerated with 4-6 ml/l hydrochloric acid, and the regeneration solution is recycled after removing hydrogen cyanide; The pH of the mixed wastewater of passivation and electroplating rinsing is controlled to be 0~5, and hexavalent chromium ion is removed by anion exchange resin adsorption.
Adjust the pH of wastewater to 5~10 to form sediment, and the sediment is sent to the acid dissolving tank through pressure filtration and cleaning; The cyanide ion is removed from the clarified solution by adsorption of anion exchange resin, then the metal cation is removed by hydrogen strong acid cation exchange resin, and the low salt water is reused by reverse osmosis system.
High salt water removes heavy metal ions through chelating ion exchange resin, evaporates and concentrates into harmless solid impurities through pH adjustment and flocculation treatment, and condensate is recycled, or high salt water is directly discharged after COD reaches the standard through ultraviolet photocatalytic oxidation after being treated by chelating ion exchange resin 。
