Electroplating wastewater treatment equipment is a device specifically designed to handle the wastewater generated during the electroplating production process. It can effectively remove pollutants such as oils, suspended solids, heavy metals, and organic substances from the wastewater, converting it into clean water that meets discharge standards. Electroplating wastewater treatment equipment typically consists of pre-treatment, intermediate treatment, and post-treatment stages, which include physical treatment, chemical treatment, and biological treatment technologies.

The application scope of electroplating wastewater treatment equipment is very wide, covering fields such as electroplating, electronics, printing, and surface treatment. It not only effectively solves the wastewater problems arising from industrial production but also reduces environmental pollution, enhances corporate image and social responsibility. At the same time, electroplating wastewater treatment equipment can save water resources, reduce production costs, and improve the economic benefits of enterprises.

Product presentation

At present, in China, the treatment of electroplating wastewater mainly involves classifying it into three categories: 

Chromium-containing wastewater: The hexavalent chromium is mainly treated with the method of neutralization. 

2. Cyanide-containing wastewater: Mainly treated by removing cyanide. 

3. Other wastewater: includes copper, nickel, zinc, etc. 

The sources of electroplating wastewater are generally as follows: (1) cleaning water of plated parts; (2) waste electroplating solution; (3) other wastewater, including water from flushing the workshop floor, washing the electrode plates, condensation water from ventilation equipment, as well as various electrolyte solutions and drainage caused by leakage of the electroplating tank or improper operation and management; (4) cooling water of equipment. The cooling water is not contaminated during use, except for the increase in temperature. The quality and quantity of electroplating wastewater are related to factors such as electroplating production process conditions, production load, operation management and water usage methods. The quality of electroplating wastewater is complex and the components are difficult to control. It contains heavy metal ions such as chromium, cadmium, nickel, copper, zinc, gold, silver, and cyanide, and some of them are carcinogenic, teratogenic, mutagenic toxic substances.

Source of wastewater

The sources of electroplating wastewater are generally as follows: 

Plating part cleaning water 

(2) Waste electroplating solution; 

(3) Other wastewater includes the water used for cleaning the workshop floor, washing the electrode plates, the condensate from ventilation equipment, as well as various types of solution and drainage resulting from leakage in the plating tanks or improper operation and management. 

(4) The cooling water for the equipment remains uncontaminated and its temperature only increases during use. 

(5) Metal surface treatment: Metal surface treatment involves cleaning before surface treatment, electroplating, passivation film protection, mechanical processing, and coating application, with electroplating being the main method.

Wastewater characteristics

The cleaning wastewater and the waste liquid generated during the alkaline oil removal process are all alkaline wastewater, typically containing oils and other organic compounds. 

2. The cleaning water generated during the acid washing process is usually highly acidic and contains heavy metal ions as well as a small amount of organic additives. 

3. The pre-treatment wastewater accounts for approximately 50% of the total electroplating wastewater. The wastewater contains certain salts, free acids, and organic compounds, and its components vary greatly. These variations are influenced by the type of plating, the pre-treatment process, and the management level of the factory. 

4. The rinsing water for the coating is the main source of heavy metal pollution in electroplating operations. The amount of rinsing wastewater discharged, as well as the types and concentrations of heavy metal ions, vary with factors such as the physical shape of the parts, the formula of the electroplating solution, the rinsing method, and the management level of the electroplating operation. In particular, the rinsing process has a significant impact on the concentration of heavy metals in the wastewater, directly affecting the recovery of resources and the treatment effect of the wastewater. 

5. Post-treatment of the coating mainly includes passivation after rinsing, removal of defective coatings, and other special surface treatments. During the post-treatment process, a large amount of heavy metal wastewater is also generated. Such coating post-treatment wastewater is complex and variable, and the volume is unstable. Generally, it is combined and treated with mixed wastewater or acid-base wastewater. 

6. The electroplating wastewater usually contains high concentrations of heavy metal ions and a large amount of accumulated impurities. Not only are the types of pollutants different, but also the concentrations of the main pollutants, the concentrations of other metal impurity ions, and the solution medium often have significant differences. These differences determine the diversity of treatment technologies and the particularity of processing methods for these wastewater.