江苏携德节能科技有限公司

Introduction to electroplating wastewater

The composition of wastewater produced in electroplating production is very complex. In addition to cyanide (CN-) and acid-base, heavy metals are potentially hazardous sewage types in the electroplating industry. These substances seriously harm the environment and human health.

The main sources of electroplating wastewater are:

1、Cleaning water for plating parts (the main source of wastewater). In addition to heavy metal ions, the waste water also contains a small amount of organic matter, the content of which is relatively low, but the amount is relatively large.

2、The plating solution filters the flushing water and the discharge of the waste plating solution. The amount of this part of wastewater is not large, but the content is high and the pollution is large.

3、Waste liquid discharged by "running, dripping, leaking" caused by process operations, equipment, and process flow.

4、Waste water generated from washing equipment, floors, etc.

The treatment of electroplating wastewater is generally valued at home and abroad, and a variety of treatment technologies have been developed to eliminate and reduce pollutant emissions through measures such as treating toxic to non-toxic, transforming harmful to harmless, recovering precious metals, and water recycling. With the rapid development of the electroplating industry and the increasing environmental protection requirements, electroplating wastewater treatment has begun to enter the stage of clean production technology, total control and circular economy integration. Resource recycling and closed-circuit recycling are the mainstream direction of development [1] .

The evaporative concentration method is used to treat electroplating heavy metal wastewater. The process is mature and simple, does not require chemical reagents, has no secondary pollution, can reuse water or valuable heavy metals, and has good environmental and economic benefits, but due to high energy consumption and high operating costs The problem of impurity interference with resource recovery remains to be studied, which limits the application. At present, it is generally used as an auxiliary processing method for other methods.