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Anodic oxidation nitrate nitrogen-containing wastewater treatment process

An anodizing and wastewater treatment technology, applied in water/sewage treatment, water/sewage multi-stage treatment, heating water/sewage treatment, etc. The effect of good reused water quality and high purity of produced water

Inactive Publication Date: 2020-12-08
何学文
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Problems solved by technology

Although this process has reached the discharge standard of electroplating wastewater, it has not achieved reasonable recycling of wastewater

Method used

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  • Anodic oxidation nitrate nitrogen-containing wastewater treatment process

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Embodiment Construction

[0028]In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with examples. The purpose of separating nitric acid, aluminum nitrate and water. The specific examples described here are only for explaining the present invention. It is not used to limit the present invention.

[0029]In order to achieve the above objective, the technical solution of the present invention is as follows.

[0030]Seefigure 1 As shown, the present invention provides an anodic oxidation wastewater treatment process containing nitrate nitrogen, and the process flow includes the following steps:

[0031]Step 1: Electrolytic ion-exchange membrane treatment: Use a pump to introduce the wastewater containing aluminum nitrate and nitric acid in the anodized wastewater to the electrolytic ion-exchange membrane equipment for concentration and separation to obtain high-purity and high-concentration n...

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Abstract

The invention provides an anodic oxidation nitrate nitrogen-containing wastewater treatment process, belongs to the technical field of anodic oxidation wastewater treatment, and particularly relates to an anodic oxidation nitrate nitrogen-containing wastewater treatment process. The process comprises the following steps: electrolytic ionic film treatment, pure water recycling, low-temperature evaporation, nitric acid recycling, aluminum nitrate slag liquid treatment, secondary low-temperature evaporation, secondary nitric acid recycling and aluminum sulfate slag liquid treatment. Compared withthe prior art, the process has the following advantages and effects: firstly, the process can realize zero discharge of wastewater, recycling of nitric acid and utilization of waste residues, can thoroughly solve the problem that the it is difficult for total nitrogen discharged by the wastewater to reach the standard, and has considerable economic benefits; secondly, the purity of the produced water separated by the electrolytic ionic film is high, the conductivity is below 10us / cm, and the cyclic utilization of the wastewater can be realized; thirdly, the recovered nitric acid is high in purity and can be used as a raw material to be blended and recycled, and waste residue utilization can be achieved; and finally, the process is simple, low in cost and convenient to popularize and use.

Description

Technical field[0001]The invention belongs to the technical field of anodic oxidation wastewater treatment, and particularly relates to an anodic oxidation wastewater treatment process containing nitrate nitrogen.Background technique[0002]In the aluminum anodizing process, nitric acid is used to remove the ash, and it needs to be cleaned into the follow-up procedure. The cleaning wastewater contains nitric acid and aluminum nitrate and the waste liquid of the nitric acid concentrated solution tank. It needs to be replaced regularly. This wastewater contains nitric acid and aluminum nitrate. Nitrogen, in order to make the total nitrogen in the wastewater meet the standard, the conventional method is physical and chemical precipitation, and then use the biological method to remove the total nitrogen. The biological method to remove the total nitrogen has the problem of high cost and difficult to meet the standard.[0003]The prior art discloses a comprehensive treatment process for elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/469C02F1/04
Inventor 何学文
Owner 何学文
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