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Electrochemical method and device for removing nitrate in sewage

A nitrate and electrochemical technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as secondary pollution of water bodies, achieve long electrolytic life, stable electrolytic performance, The effect of high processing efficiency

Active Publication Date: 2017-01-25
SUNRUI MARINE ENVIRONMENT ENG
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Problems solved by technology

[0009] (1) The electrolysis time control is non-automated. After the oxidizing substances generated by the anode of the electrolytic cell completely react with the ammoniacal nitrogen in the sewage, if the electrolysis is continued, excessive oxidizing substances will continue to be generated, causing secondary pollution to the water body. Follow-up is required

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  • Electrochemical method and device for removing nitrate in sewage

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Embodiment Construction

[0026] see figure 1 , an electrochemical method for removing nitrate in sewage according to the present invention, the sewage containing nitrate is sent into the electrolytic cell 13; after reaching the set high water level, the DC power supply 10 is turned on to start electrolysis, and the nitrate is reduced to generate NH4+ in the cathode area of ​​the electrolytic cell , NO2- and N2, the ClO- and •OH generated in the anode area of ​​DSA will generate nitrite and ammoniacal nitrogen and be anodized to nitrogen or nitrate. All the nitrates are converted into harmless nitrogen gas.

[0027] The present invention removes the chemical reaction process of nitrate in sewage as follows:

[0028] 1. Through electrolysis, NO3- in sewage can be removed. The electrochemical reaction in the electrolysis process is as follows:

[0029] Electrochemical reactions near the cathode:

[0030] NO3- + H2O + 2e- → NO2- + 2OH- (1)

[0031] NO3- + 3H2O + 5e- → 1 / 2N2 + 6OH- (2)

[0032] NO2- +...

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Abstract

The invention discloses an electrochemical method and device for removing nitrate in wastewater. The device is composed of an electrolytic bath unit, a potential measurement unit and a control unit. Nitrate in wastewater can be converted into nonhazardous nitrogen. Metal oxide anodes are adopted for high-efficiency catalysis of Clo- and.OH generation without adding C1-. Changes of water oxidation-reduction potential are monitored in real time in the electrolytic process, start and stop of electrolytic are controlled according to the changes, secondary pollution to water due to over electrolysis is avoided, and aftertreatment is not needed. The device is simple in structure, low in requirement on environmental conditions and high in automation level.

Description

technical field [0001] The invention relates to an electrochemical method and device for removing nitrate in sewage, which is used for sewage treatment. Background technique [0002] With the development of industry and agriculture and the increase of population, the discharge of nitrogen-containing compounds has increased sharply, and the accumulation of nitrate in water bodies has become increasingly serious, causing serious harm to human health and the growth and metabolism of animals and plants, and has become the most common pollution in water bodies. factor. [0003] Common sewage denitrification technologies mainly include abiotic method and biological method. Abiotic denitrification mainly includes chemical reduction method, electrodialysis membrane method, reverse osmosis membrane method, and ion exchange method. The chemical reduction method refers to the use of a certain reducing agent to reduce nitrate in water to remove it. This method can quickly remove nitrat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/467C02F1/58
Inventor 于林刘光洲王洪仁于青丁慧王辉刘雪雷
Owner SUNRUI MARINE ENVIRONMENT ENG