Method for purifying waste water and recovering waste materials on line in electroplating and chemical plating processes

Abstract

The invention provides a method for purifying waste water and recovering waste materials on line in electroplating and chemical plating processes. The method comprises the following steps of: directly arranging a capacitance deionizer in a water washing device on a production line to adsorb various negative ions and positive ions in waste water during charging a battery so as to purify the waste water; and then releasing and recovering waste materials through electrode discharge so as to realize zero release of pollutants. The invention ensures that the capacitance deionization method is suitable for the manufacturing processes of various electroplating or chemical plating products through the optimization of process parameters. Through on-line purification and recycle of washing water, the burden of the traditional waste water treatment system is obviously reduced, meanwhile, the quality of plating pieces is guaranteed because the water quality of the washing water is obviously improved, and the classified recovery of waste materials can be achieved. The method can also obviously reduce the COD in the waste water and has wide application prospect in the fields of electroplating and chemical plating.

Description

technical field

[0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for on-line purification of wastewater generated in electroplating or chemical plating processes and recovery of useful substances in the wastewater by using a capacitive deionization method. Background technique

[0002] As a surface treatment technology with a long history of development, electroplating and chemical plating technology not only play an important role in traditional industries, but also in many modern high-tech industries, such as electronics, microelectronics, communications, information technology, aerospace and other fields is also essential. But on the other hand, electroplating and electroless plating are recognized as a high-pollution industry. Although they produce less wastewater than many other industries, such as papermaking, printing and dyeing, and chemical industry, they still produce Wastewater often contains a large am...