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Electrochemical oxidation device for removing chloride ions in water

An oxidation device and electrochemical technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc. problems, to achieve good environmental and economic benefits, easy processing, and strong corrosion resistance.

Active Publication Date: 2018-08-24
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional treatment methods basically cannot reduce the content of chloride ions in water. Advanced treatment methods can remove chloride ions in wastewater through membrane treatment technology, but the service life of the membrane and the pollution of the membrane need to be further resolved. A small amount of concentrated The wastewater contains a large amount of chloride ions, which affects the discharge or cannot achieve zero discharge of wastewater

Method used

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  • Electrochemical oxidation device for removing chloride ions in water
  • Electrochemical oxidation device for removing chloride ions in water
  • Electrochemical oxidation device for removing chloride ions in water

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The preparation steps of the oxide anode are as follows: (1) pretreatment of the titanium sheet: the titanium sheet is polished with sandpaper to show a bright color, soaked in 12% hydrochloric acid for 40 minutes, and then rinsed with deionized water;

[0035] (2) Get antimony trichloride and tin tetrachloride, join in ethanol solution, make it dissolve, control the mol ratio of tin and antimony to be 12:1; Obtain the ethanolic solution of antimony trichloride and tin tetrachloride; Apply an ethanol solution of antimony trichloride and tin tetrachloride to the surface of the treated titanium sheet; after coating evenly on both sides, dry it at 80-90 degrees Celsius, take it out and calcinate it at 550-600 degrees Celsius for 10 minutes ; The above steps are repeated 5-8 times, and the last calcination time is 2 hours to obtain an electrode with an intermediate layer for subsequent use;

[0036] (3) get light yellow cerium oxide and copper nitrate to add water and nitri...

Embodiment 2

[0039] The specific structure is the same as in the examples, the difference being the preparation conditions of the oxide anode;

[0040] The preparation steps of the oxide anode are as follows: (1) pretreatment of the titanium sheet: the titanium sheet is polished with sandpaper to present a bright color, soaked in 18% hydrochloric acid for 30 minutes, and then rinsed with deionized water;

[0041] (2) Get antimony trichloride and tin tetrachloride, join in the ethanol solution, make it dissolve, apply the ethanol solution that is uniform antimony trichloride and tin tetrachloride to the surface of treated titanium sheet, control tin and tin tetrachloride The molar ratio of antimony is 6:1; when both sides are evenly coated, dry at 80-90 degrees Celsius, take it out and calcine at 550-600 degrees Celsius for 10 minutes; repeat the above steps 5-8 times, the last calcination time For 2 hours, the electrode with the intermediate layer was obtained and set aside;

[0042] (3) ge...

Embodiment example 1

[0053] Implementation case 1: Use the above preparation method to prepare the required anode, and treat the sewage drainage of Hubei Jinao Technology Co., Ltd. The quality of sewage drainage is: chloride ion 625.7mg / L, hardness 5.42mmol / L, ammonia nitrogen about 1.877mg L -1 , pH = 6.2-6.5, through the design of the treatment tank volume 3L; 138cm 2 (four pieces), cathode area: 138cm 2 (four pieces).

[0054] The device is first filled with 3L of wastewater (without pH adjustment), powered on under different conditions, and treated statically for 3 hours to ensure that the chlorine ions in the 3L wastewater in the treatment pool are reduced by 80%, and then turn on the constant flow pump to control the flow and retention of water in and out. Time, treated according to different conditions, sampling once an hour, monitoring the chloride ion concentration of the water sample in the drainage pool, running continuously for each test, the chlorine ion in the effluent is stable at ...

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Abstract

The invention provides an electrochemical oxidation device for removing chlorine ions in water. The electrochemical oxidation device for removing chlorine ions in water comprises a DC(direct current)stabilized power supply, a constant current pump, a storage tank, an oxidation dechlorination tank, a gas collection tank, a drainage storage tank and a rotor flow meter; the oxidation dechlorinationtank is provided with an electrode array which comprises an oxide anode with titanium plates as a substrate and a titanium mesh cathode and is connected to a power source; through the electrode arraycomprising the oxide anode with titanium plates as the substrate and the titanium mesh cathode, the high potential and the catalytic activity of the anode are utilized to directly oxidize the chlorideions in the water; the chloride ions in the water are first oxidized on the surface of the anode to form adsorbed chlorine atoms, and then the two adsorbed chlorine atoms are chemically combined to form one chlorine gas molecule which is separated from the surface of the electrode; and electrons are mainly used as reagents, and no other agents are needed to add. By adopting the electrochemical oxidation device, no other agents are needed to add; and the electrochemical oxidation device is flexible in operation, environmentally friendly, and easy to maintain, and can be continuously operated.

Description

technical field [0001] The invention relates to the field of water and waste water treatment, in particular to an electrochemical oxidation device for removing chlorine ions in water. Background technique [0002] With the promulgation of the Water Ten Articles, the state has begun to increase the treatment of wastewater, and the environmental protection standards for various wastewater have become stricter. Zero discharge of corporate wastewater will become an inevitable development trend. Chloride ion removal is one of the issues considered in zero discharge. The removal of chloride ions in water is involved in the concentrated discharge of circulating cooling water, the concentrated discharge of reverse osmosis membrane and the reuse of desulfurization wastewater. Because of the high content of chloride ions, it will cause corrosion to water system pipes, various metal materials and related power equipment, making it very difficult to treat and recycle high-salt wastewate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/72C02F101/12
CPCC02F1/4672C02F2101/12
Inventor 于萍罗运柏
Owner WUHAN UNIV
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