Technology for processing and recycling electroplating wastewater containing cyanide and system thereof

Abstract

The invention relates to a technology for processing and recycling wastewater and a system thereof, in particular to a technology for processing and recycling electroplating wastewater containing cyanide and a system thereof. The processing steps are as follows: a level I reverse osmosis device with high recovery rate is used for separating salt substance from the wastewater containing cyanide; then an electrolysis unit is used for removing cyanide and heavy metal in the reverse osmosis concentrated water; and then a level II reverse osmosis device is used for concentrating the wastewater. The wastewater containing cyanide is concentrated by 95 to 120 times. By combing the level II reverse osmosis process with the electrolytic process, the technology has the advantages of reducing consumption of chemicals, simplifying operating process and recycling heavy metals of high purity compared with the traditional chemical method.

Description

technical field [0001] The invention relates to a wastewater treatment process and a system thereof, in particular to a treatment and reuse process and a system for electroplating cyanide-containing wastewater. Background technique [0002] Electroplating is one of the three major polluting industries in the world today. According to incomplete statistics, the national electroplating industry discharges about 4 billion cubic meters of electroplating wastewater every year, which is equivalent to the tap water supply of several large and medium-sized cities, seriously exacerbating the shortage of water resources. [0003] At present, the following methods are generally used to treat electroplating wastewater: [0004] Chemical method: Dosing chemicals into the wastewater to convert the toxic substances into non-toxic substances or sediments with greatly reduced toxicity. Chemical methods include: neutralization precipitation method, neutralization coagulation precipitation m...

AI Technical Summary

Problems solved by technology

[0010] The present invention mainly provides an electroplating cyanide-containing wastewater with good recycling effect, low energy consumption, zero discharge, and effective removal of cyanide and other harmful substances in the electroplating cyanide-containing wastewater; solves the problems existing in the prior art The recycling effect is not good, the energy consumption is high, and the wastewater treatment effect is not ideal.

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