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Electrochemical filter for removing total nitrogen in water

A filter, electrochemical technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of electrode rejection of reactants, reaction gas accumulation, small reaction area, etc., to increase the reaction active site. point, weaken the adverse effects, the effect of large reaction area

Active Publication Date: 2021-12-10
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to provide an electrochemical filter for removing total nitrogen in water and its use method. The electrochemical reactor is based on electrodes with three-dimensional nano-tip structure, and a continuous flow reactor is designed to achieve efficient removal of total nitrogen. , to solve the problems of small effective reaction area of ​​electrodes in existing electrochemical reactors, too large distance between electrodes, low mass transfer efficiency, low reaction efficiency, electrode rejection of reactants, accumulation of reaction gases, difficulty in scaling up the reactor, etc.

Method used

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  • Electrochemical filter for removing total nitrogen in water
  • Electrochemical filter for removing total nitrogen in water
  • Electrochemical filter for removing total nitrogen in water

Examples

Experimental program
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Embodiment 1

[0062] A method for preparing a ruthenium-iridium-titanium porous anode containing a nano-tip structure, the preparation steps are as follows:

[0063] (1) Pretreatment of the titanium screen substrate: put the titanium screen in a mixed acid solution containing hydrofluoric acid, nitric acid and high-purity water for 10 seconds to remove the oxide film on the surface, and then put the titanium screen in a mixed acid solution containing hydrofluoric acid, nitric acid and high-purity water The volume ratio is 1:4:5. Then, in a constant temperature water bath at 90° C., the oil on the titanium substrate was removed by treating with a 30 wt.% NaOH solution for 30 minutes.

[0064] (2) Acid etching: Put the above-mentioned washed titanium mesh into an oxalic acid solution with a mass fraction of 10%, and etch it in a constant temperature water bath at 90°C for 1.5 hours. After the treatment, rinse the substrate with a large amount of water Oxalic acid and titanium oxalate remaini...

Embodiment 2

[0069] A method for preparing a porous cathode containing a nano-tip structure, the preparation steps are as follows:

[0070] (1) Pretreatment of the barbed wire base: put the barbed wire into 0.5mol / L hydrochloric acid to remove the oxide layer, then ultrasonically treat it in ethanol solution for 10min, and then soak it in 1mol / L sodium hydroxide solution for 30min to remove the material Contaminants on the surface.

[0071] (2) Anodizing: Then in a constant temperature of 40°C, in a 2mol / L sodium hydroxide electrolyte, control the current density to 15mA / cm 2 , after anodizing for 10 min, a three-dimensional nano-tip porous cathode is obtained, such as image 3 shown.

Embodiment 3

[0073] combine figure 1 Describe this embodiment, an electrochemical filter for removing total nitrogen in water in this embodiment includes a cathode tank cover 3, a cathode terminal 1, a water inlet 2, a cathode reaction tank 8, a sealing rubber pad 4, and a three-dimensional nano-tip porous cathode 5 , filter tank main body 6, support column 7, anode reaction tank 9, three-dimensional nano-tip porous anode 10, 11, anode tank cover 14, anode terminal 12, water outlet 13;

[0074] The electrochemical filter water inlet 2 is located at the cathode reaction tank 8 side, and the position is obliquely below the cathode tank cover 3; the water outlet 13 is located at the anode reaction tank 9 side, and the position is obliquely above the anode tank cover 14; the cathode terminal 1 and the anode The horizontal position of the terminal post 12 is 15 mm higher than the horizontal position of the water outlet 13 .

[0075] The three-dimensional nano-tip porous cathode 5 is formed by ...

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Abstract

The invention belongs to the technical field of water treatment, and discloses an electrochemical filter for removing total nitrogen in water. A water body to be treated is continuously pumped into a cathode reaction chamber through a water inlet, sequentially flows through a three-dimensional nano tip porous cathode and an anode under certain current and voltage, and reacts for a certain period of time, and finally, nitrate nitrogen, ammonia nitrogen and nitrite nitrogen in the water body are converted into nitrogen. The mass transfer distance from a substance to the surface of an electrode can be shortened by utilizing a micron-sized aperture electrode, the collision opportunity of pollutants and the electrode in the liquid flowing process is increased by the nano-tip structure in the pore channel, and meanwhile, reaction ions are limited in the internal channel of the three-dimensional nano-tip porous electrode; and the repulsive interaction of like ions under the action of electric field force is weakened, and the problems that a traditional electrochemical reactor electrode is small in effective reaction area, too large in distance between two electrodes, low in mass transfer efficiency and low in reaction efficiency, reactants are rejected by the electrode, reactant gas is accumulated, and the reactor is difficult to amplify are solved.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to an electrochemical filter for removing total nitrogen in water. Background technique [0002] Electrochemistry is an effective water treatment technology that uses electrons and active hydrogen to reduce nitrate to produce nitrogen, because it has no pH limit, retains other salts, does not produce concentrated liquid, does not need to add chemicals, does not have backwashing, is easy to automate control, and is effective The advantages of stability and rapid response have been extensively studied and applied. [0003] The electrochemical reactor structure has been extensively studied as an important factor affecting the electrochemical redox efficiency. The plate-trough reactor is the most researched electrocatalytic reactor, but the plate-type electrode has the disadvantages of small effective reaction area, too large distance between two electrodes, limited mass transf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F101/16
CPCC02F1/46109C02F2001/46161C02F2101/163C02F2101/166C02F2101/16
Inventor 于洪涛康文达
Owner DALIAN UNIV OF TECH
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