Nitrate sewage treatment method

A treatment method, nitrate technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of high yield of by-products, reduced reduction efficiency, long reaction time, etc. problem, to achieve the effect of increasing the possibility of contact, improving the reduction efficiency, and improving the current efficiency

Active Publication Date: 2021-10-29
GUANGDONG UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the current electrochemical method still has shortcomings in the reduction of nitrate and other anions: the current utilization rate of the electrochemical method is low, the yield of by-products is high, and the reaction time is long. For example, the rate-controlling step of nitrate reduction lies in the NO 3 - The electrons adsorbed on the electrode and transferred to the cathode material plus the protons in the aqueous solution (H + ) reaction to produce NO 2 - , but NO 3 - It is negatively charged, and the cathode will repel NO due to the electric field force 3 - , the anode will also attract NO due to the electric field force 3 - , which would result in NO 3 - The reduction product NO 2 - is re-oxidized to NO around the anode 3 - , so that the total time of reduction is prolonged and the reduction efficiency is reduced

Method used

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Embodiment 1

[0030] For the convenience of explaining the application principle of the method for treating nitrate sewage of the present invention, the present embodiment uses nitrate-containing NO 3 - The sewage of the present invention is used as an example to illustrate. In practical application, the treatment method of nitrate sewage of the present invention can also treat sewage containing other ions.

[0031] A method for treating nitrate sewage disclosed in this embodiment includes the following steps:

[0032] S1, using such as Figure 1-Figure 3 The electrochemical device shown, the electrochemical device comprises a DC power supply 1, an electrolytic cell 2, and a proton exchange membrane 5 disposed in the electrolytic cell 2 to separate the electrolytic cell 2 into a cathode chamber 3 and an anode chamber 4, so The cathode chamber 3 is provided with a cathode plate 6, the anode chamber 4 is provided with an anode plate 7, the anode of the DC power supply 1 is connected to the ...

Embodiment 2

[0052] The difference between this embodiment and Embodiment 1 is that the cathode chamber is provided with a loop channel (not shown in the figure), and the two ports of the loop channel are a water outlet and a water inlet respectively, and the water inlet and / or Or the water outlet is connected with a micro peristaltic pump, and the loop channel enables the sewage to be recycled and processed, so as to improve the treatment effect. The cathode chamber is also provided with a water inlet and a water outlet. The water inlet and the water outlet are respectively provided with electromagnetic valves. When sewage needs to be discharged or imported, the electromagnetic valves can be controlled.

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Abstract

The invention relates to the technical field of sewage treatment, in particular to a nitrate sewage treatment method which comprises the following steps that S1, an electrochemical device is adopted; S2, two permanent magnet plates are mounted on the peripheral wall of an electrolytic bath, the two permanent magnet plates are oppositely arranged, and the plate surfaces of the two permanent magnet plates are perpendicular to the plate surface of the anode plate and the plate surface of the cathode plate; S3, nitrate sewage is injected into an anode chamber, nitrate sewage to be treated is injected into a cathode chamber, and the sewage concentration in the cathode chamber is larger than that in the anode chamber; and S4, a direct-current electric field is applied to the anode plate and the cathode plate, and the nitrate sewage in the cathode chamber is subjected to reduction treatment. The nitrate sewage treatment method has the advantages of being high in original rate and high in reduction speed.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for treating nitrate sewage. Background technique [0002] Nitrogen is very important to all life, but if nitrogen is in the wrong form or location, it can be harmful to life. In water, nitrogen usually exists in the form of nitrate, nitrite, and ammonium ions. Nitrate is a non-ligand-forming oxyanion that has high mobility and is soluble in water. With the rapid development of industry and agriculture, the excessive use of nitrogen fertilizers, and the lack of proper treatment of domestic and industrial sewage, nitrate pollution in water has become a problem that cannot be ignored. If nitric acid is added to drinking water in excess, it can lead to methemoglobinemia, which is caused by nitrite in the human gastrointestinal tract. Nitrite is reduced from nitrate by microbes in the gastrointestinal tract, oxidizing ferrous ions in hemoglobin to ferric ions, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12C02F101/16
CPCC02F9/00C02F2101/163C02F1/46104C02F1/481C02F1/4676C02F7/00
Inventor 黄乙辉唐念张路路彭进平
Owner GUANGDONG UNIV OF TECH
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