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Method for treating copper-ammonia complex wastewater by electrocatalysis

A copper-ammonia complex wastewater, electrocatalysis technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the secondary pollution of stripping gas, increase the difficulty of ammonia stripping method, Deal with high cost problems, achieve direct discharge or reuse, avoid secondary pollution problems and cost problems, and achieve high denitrification efficiency

Inactive Publication Date: 2017-10-31
SHAANXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Put the chlorine analysis electrode into the electrolytic cell, pass through 250ml of copper ammonia complex wastewater, the initial concentration of ammonia nitrogen is 4700mg / L, the chloride ion concentration is 30000mg / L, the initial pH value is 10.4, and the copper ammonia complex wastewater is electrolyzed Catalytic treatment, the process parameters are: at room temperature and stirring conditions, the current density is 8.9mA / cm 2 , the electrolysis time is 180min, and the electrode distance is 2.5cm.

[0015] After electrolysis, the removal rate of ammonia nitrogen was measured to be 100%, and the pH changed from 10.4 to 7.33, which can realize the complete removal of ammonia nitrogen.

[0016] The ammonia nitrogen removal rate refers to the ratio of the ammonia nitrogen concentration removed by electrocatalysis to the initial concentration.

Embodiment 2

[0018] Condition is the same as embodiment 1. When the electrolysis time was 90min, and other conditions remained unchanged, the removal rate of ammonia nitrogen was measured to be 67%, and the pH changed from 10.4 to 8.69.

Embodiment 3

[0020] Condition is the same as embodiment 1. When the electrolysis time was 30min and other conditions remained unchanged, the removal rate of ammonia nitrogen was measured to be 28%.

[0021] It can be seen that under certain conditions, with the extension of electrolysis time, the removal rate of ammonia nitrogen gradually increases, and finally can be completely removed.

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Abstract

The invention discloses a method for treating copper-ammonia complex wastewater by electrocatalysis. A chlorine analysis electrode is used as an anode, a titanium mesh is used as a cathode, and the copper-ammonia complex wastewater is passed through, and the copper-ammonia complex wastewater is electrolytically and catalytically treated. The final wastewater is directly discharged or enters subsequent treatment. The method for treating copper-ammonia complex wastewater by the electrocatalysis method of the present invention has high denitrification efficiency for high-concentration copper-ammonia complex wastewater. Under certain conditions, the treatment efficiency is close to 100%, and the direct discharge or discharge of copper-ammonia complex wastewater can be realized. Reuse. At the same time, organic matter and chloride ions existing in the treatment process have a certain removal effect. In addition, copper-ammonia complex wastewater is mostly alkaline, and the electrolysis method has no special requirements on the pH of the wastewater. Under alkaline conditions, it can be directly electrolyzed, reducing the need to add acid for neutralization in the actual treatment process. There is no need to add other chemical reagents in the process, effectively avoiding secondary pollution and cost problems.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461
Inventor 马宏瑞马鹏飞蒋伟群秦静静王家宏
Owner SHAANXI UNIV OF SCI & TECH