Process for recycling electroplating waste to prepare pure water

Abstract

The invention relates to a process for reclaiming electroplating waste water to produce pure water. The process comprises the following steps that: the electroplating waste water containing heavy metal ion undergoes pretreatment, nanofiltration and reverse osmosis separation in turn so as to generate pure water used for production; during the pretreatment, the electroplating waste water is filtered by a mechanical filter, an active carbon filter and a security filter in turn so as to generate primary water; during the nanofiltration, the primary water passes through a nanofiltration system, and impurities including the heavy metal ion in the primary water are intercepted by a nanofiltration membrane element; moreover, more than 90 percent of the primary water passes through the nanofiltration membrane element so as to generate high-purity secondary water; and during the reverse osmosis separation, the secondary water passes through an anti-pollution membrane reverse osmosis element so as to obtain pure water used for production. The pure water reclaimed through the process can be directly used in electroplating production, thereby minimizing the cost of electroplating process.

Description

technical field [0001] The invention relates to a treatment method for electroplating wastewater, in particular to a process for recycling electroplating wastewater to produce pure water. Background technique [0002] The electroplating industry is an important processing industry in my country. There are more than 15,000 electroplating manufacturers nationwide, and about 400 million tons of electroplating wastewater are discharged every year. Electroplating wastewater contains heavy metals and various chemical raw materials added in the electroplating process. It belongs to high-concentration refractory industrial wastewater and high-concentration toxic and harmful wastewater. If it is discharged directly without treatment, it will cause serious environmental pollution and be extremely harmful to humans. big. [0003] At present, the domestic electroplating industry generally adopts the terminal chemical treatment method to control the pollution of electroplating wastewate...

AI Technical Summary

Problems solved by technology

However, due to the need for multiple cycle operations, and the treated pure water can only meet the requirements of rinsing water, the cost reduction is not large

In view of the high purity requirements for electroplating production, especially the water used for electroplating raw materials, production water can be finally obtained from ordinary water through a series of purification processes, but the cost is relatively high

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