Method for treating cuprammonia complex wastewater through electro-catalysis method

Abstract

The invention discloses a method for treating cuprammonia complex wastewater through an electro-catalysis method. The method comprises the steps of taking a chlorine evolution electrode as an anode, taking a titanium mesh as a cathode, pumping in cuprammonia complex wastewater, performing electrolytic catalytic treatment on the cuprammonia complex wastewater, and directly discharging the treated wastewater or enabling the treated wastewater to enter follow-up treatment. The method for treating cuprammonia complex wastewater through the electro-catalysis method, provided by the invention has nitrogen removal efficiency to high-concentration cuprammonia complex wastewater, and under a certain condition, the treating efficiency is close to 100 percent, so as to realize the direct discharge or reuse of the cuprammonia complex wastewater. Meanwhile, both organic matters and chloridion existing in a treatment process can be removed to some degree. In addition, most of the cuprammonia complex wastewater is alkaline, an electrolytic method has no special requirements on pH of the wastewater, and electrolysis can be directly performed under an alkaline condition, so that acid required to be added during an actual treatment process is reduced, and therefore, other chemical reagents are not needed to be added in the whole treatment process of the electrolytic method, and the problems of secondary pollution and cost can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for treating copper-ammonia complex wastewater by electrocatalysis. Background technique [0002] High-concentration copper-ammonia complexation is a common type of wastewater in the production process of industrial wastewater, and it is also one of the more difficult industrial wastewater. It mainly comes from the printed circuit board industry, electroplating industry, and pharmaceutical industry. Discharge of high-concentration copper-ammonia complex wastewater into the environment can easily cause algal blooms and growth in the water, resulting in eutrophication pollution. In severe cases, the dissolved oxygen content in the water will decrease, and a large number of fish will die. At the same time, it also brings difficulties to the operation of tap water treatment plants, causing the peculiar smell of drinking water. The presence of copper...

AI Technical Summary

Problems solved by technology

However, the stripping gas is easy to cause secondary pollution. The stripping process is greatly affected by the pH value and temperature of the solution. The existence of copper ions increases the difficulty of the ammonia stripping method.

The chemical precipitation method can effectively avoid the odor problem caused by the stripping method, and the treatment effect is not affected by the temperature, but the chemical precipitation process mainly adds sulfide to react the copper ammonium complex into a more stable CuS precipitate and wash it out. Because the amount of sulfide added often needs to be added in excess, it will cause secondary pollution problems

The treatment method of adding heavy metal collectors is simple and effective, but the treatment cost is high

The reduction method mostly uses iron reduction to replace copper. The method is simple and effective, but it will generate a large amount of sludge