What are the methods of electroplating wastewater treatment?
In order to make the electroplating wastewater meet the national emission standards, a lot of research has been carried out not only from the wastewater treatment method, but also from the plating solution itself and the rinsing method after plating.
In the electroplating process, research and exploration on processes such as cyanide-free electroplating, low-chromium plating and chromium-free passivation, low chromate chrome plating, trivalent chromium chrome plating or chrome plating, and cadmium plating have been carried out. Progress. Processes such as non-cyanide galvanizing, low chrome passivation, and low chromic acid chrome plating have been promoted and used in different degrees nationwide, which has greatly reduced the use of sodium cyanide and chromic anhydride in the national electroplating industry. The commissioning of these new processes has fundamentally eliminated or reduced the environmental pollution of highly toxic cyanide and chromate.
In the cleaning method, the simple cleaning method in the past was changed, and a combination of multiple recovery, multi-stage countercurrent rinsing and spray rinsing was adopted. This rinsing method not only saves a lot of cleaning water, but also recovers most of the plating solution, while reducing the concentration of harmful substances in the rinsing water, making wastewater treatment easier.
In addition to reforming from the plating solution itself and the rinsing method, the method of electroplating wastewater treatment has been further studied and many gratifying results have been achieved. At present, the methods widely used in production practice include: ferrous sulfate method for chromium-containing wastewater treatment, sodium hydrogen sulfite method, electrolysis method, ion exchange method, surfactant method, activated carbon adsorption method, ferrite method, Iron powder filtration method, coke-iron filing method, electrodialysis method, reverse osmosis method, etc.; alkaline oxidation method for treating cyanide-containing wastewater, electrolysis method, ion exchange method, etc.; ion exchange method is often used for chromium-containing and copper-containing wastewater, For mixed wastewater of various metal ions, an air floatation method is employed. The production operation shows that the above methods have their own characteristics and can effectively treat the electroplating wastewater. You can choose according to the actual situation of the unit.
With the continuous development of science and technology, processing equipment, testing and control instruments are also improved, enabling people to combine several single processing technologies for electroplating wastewater treatment, thereby achieving resource recycling and closed cycle of rinsing water. .
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Label: electroplating wastewater electrodialysis reverse osmosis chromate electrolysis
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