Industrial electroplating wastewater treatment equipment usually has efficient treatment methods for specific heavy metal ions.
For common heavy metal ions such as chromium, nickel, copper, zinc, etc., different treatment equipment may use different technical means. For example, for hexavalent chromium ions, reduction precipitation is a more effective treatment method. By adding a reducing agent, such as sodium sulfite, hexavalent chromium is reduced to trivalent chromium, and then the pH value is adjusted to form a precipitate for removal. This method can efficiently convert the more toxic hexavalent chromium into less toxic trivalent chromium and remove it, ensuring that the wastewater meets the discharge standards.
For nickel ions, ion exchange can play a better role. Using specific ion exchange resins, nickel ions are selectively adsorbed. When the resin is saturated with adsorption, its adsorption capacity can be restored through regeneration treatment. This method can remove nickel ions more accurately and can achieve resource recycling.
In terms of treating copper ions, both chemical precipitation and electrolysis have certain effects. The chemical precipitation method removes copper ions by adding a suitable precipitant to form an insoluble precipitate. The electrolysis method is to use the action of electric current to reduce and deposit copper ions on the electrode, so as to achieve the purpose of removal.
For zinc ions, chemical precipitation and other methods can also be used for treatment. By adjusting the pH value of the wastewater, zinc ions are formed into hydroxide precipitation and removed.
In addition, some advanced Industrial electroplating wastewater treatment equipment will also combine multiple treatment methods to form a combined process to improve the treatment effect of specific heavy metal ions. For example, membrane separation technology is combined with chemical precipitation method to first remove a part of the heavy metal ions through membrane separation, and then the remaining heavy metal ions are further removed by chemical precipitation method, so as to achieve efficient treatment.
However, the wastewater components generated by different electroplating processes are complex and changeable, and a single treatment method may not be able to fully meet the requirements. Therefore, when selecting Industrial electroplating wastewater treatment equipment, it is necessary to comprehensively consider the advantages and disadvantages of various treatment methods according to the characteristics and treatment requirements of the actual wastewater, and select the most suitable treatment equipment and process to ensure efficient treatment of specific heavy metal ions.
