The conventional treatment technology of electroplating wastewater in China has been relatively mature. The modern biological method for electroplating wastewater treatment is a very promising wastewater treatment technology, which does not produce secondary pollution. The key is to use new technology to further treat it and further improve the effluent quality. Membrane treatment technology will play an important role in electroplating wastewater treatment in the future because of its high separation efficiency and the ability to recover heavy metals. At the same time, through the promotion of cleaner production process, reducing the amount of pollution discharge from all aspects of electroplating production and changing "passive treatment" to "active treatment" are also the fundamental methods to solve the pollution of electroplating wastewater.

China, like other countries, attaches great importance to the treatment of electroplating wastewater. In the past few decades, a lot of research work has been carried out on the treatment methods of electroplating wastewater, and the investment in treatment is also increasing. In the future, as in the past, efforts will be made to solve this problem. According to the treatment and research of electroplating wastewater at home and abroad, the development trend should be as follows:

Actively carry out comprehensive prevention and control

After decades of development, the treatment of electroplating wastewater has changed from simple "waste treatment" to comprehensive treatment, that is, a positive method of both prevention and recovery of resources. In the past, the cleaning process has been reformed in many ways, with remarkable results. For example, multi-stage countercurrent rinsing, reform of water tank design, change of hanging mode of plated parts, etc. These reforms have greatly reduced the carrying out of plating solution, not only recovered useful substances, but also reduced the burden and cost of electroplating wastewater treatment, Electroplating equipment manufacturer Comprehensive treatment is the development trend of pollution prevention and control, but there are also many technical problems to be solved.

Develop closed loop

Closed circuit circulation is one of the most economical and effective ways to treat electroplating wastewater at present. It is the direction of treating electroplating wastewater, so as to realize basically zero discharge of electroplating rinse water. But so far, the problems such as the concentration control of the terminal tank and the application and operation of the ion exchange device have not been well solved.

Reforming electroplating process

Reforming electroplating process is the fundamental method to prevent and control pollution. Popularizing and applying various cyanide free, chromium free and other non polluting and less polluting electroplating processes can reduce the pollution source of wastewater. Cyanide free electroplating, low chromium passivation, replacing cadmium with zinc or tin zinc alloy, and the use of electrophoretic paint instead of electroplating are also increasing. At present, many units in China are exploring and practicing, but electroplating can not be completely replaced, and there are many specific problems to be solved.

Multivariate combination technology

In the treatment of electroplating wastewater, a single method is often difficult to meet the ideal requirements, and various combination methods will gradually replace a single treatment method. From the perspective of development trends at home and abroad, chemical methods tend to be the main method, supplemented by other combined processing technologies and automatic detection and control means. It is a development direction to research and develop multi-function combined processor. It can not only treat mixed electroplating wastewater with complex composition, but also miniaturize the process and equipment, thus saving floor space and project investment.