Treatment method of copper-containing industrial wastewater

Abstract

The invention relates to a treatment method of copper-containing industrial wastewater and in particular relates to a treatment method for removing metal ions from copper-containing wastewater by adopting a combined process. In order to overcome the technical defects that the content of copper ions is relatively high and the treatment of other metal ions does not meet the standard in a copper-containing industrial wastewater treatment process in the prior art, the invention provides a treatment method of copper-containing industrial wastewater. The treatment method comprises four reaction steps of iron carbon microelectrolysis, catalytic oxidation, alkalization precipitation and acid-base neutralization. After the treatment, the content of the copper ions is remarkably lower than the national emission standard, and the content of other toxic ions also can meet the national emission standard, so that the treatment method is suitable for popularization and application in the copper-containing wastewater treatment industry.

Description

technical field [0001] The invention relates to a treatment method for copper-containing industrial wastewater, in particular to a treatment method for removing metal ions in copper-containing wastewater by a combined process. Background technique [0002] Chemical industry, printing and dyeing, electroplating, non-ferrous smelting, non-ferrous metal mining, electronic material rinsing wastewater, dye production and other processes often produce wastewater containing a large amount of copper ions. Due to the different processes of wastewater generation, the existence state, mass concentration and composition of copper ions in copper-containing wastewater are also different, and the differences are quite large. Pollutants in the copper-containing wastewater produced in the electroplating production process, such as copper sulfate, sulfuric acid, copper pyrophosphate, etc., have a mass concentration of 100mg / L and 50mg / L or less; copper-containing wastewater produced in the ci...

AI Technical Summary

Problems solved by technology

The traditional chemical reduction-precipitation method needs to add chemical agents, which has serious secondary pollution problems. At the same time, this method can only treat copper ion wastewater to a certain extent, and cannot deionize deeply. Generally, it needs to be combined with subsequent processes; the adsorption method requires Choosing a suitable adsorbent is generally only used to treat trace amounts of low-concentration wastewater, and the above two methods all have the problem of difficulty in recycling copper ions; membrane separation methods include electrodialysis, reverse osmosis and electrodeionization, etc., but this The method has high requirements on the membrane, and the cost is high and uneconomical

Although these methods have certain effects, there are problems such as complex process, high investment cost, and inability to separate deeply, which largely limits their practical application.

In addition, there is micro-electrolysis, but the main problem is that the iron-carbon filler is hardened seriously, causing the filler to be blocked, and the blocked filler cannot form a micro-primary battery, that is, the utilization rate of the iron-carbon filler is reduced.

In addition, a common problem in these treatment methods is that most of them are aimed at the treatment of copper ions in copper-containing industrial wastewater, but the treatment of hydrogen ions and ferrous ions in copper-containing industrial wastewater is not enough.

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