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Method for synchronously removing nitrate and phosphate in water by adopting three-dimensional electrolysis device

A three-dimensional electrolysis and water removal technology, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as the influence of microbial growth and hidden dangers of environmental protection, and achieve enhanced removal effects, low production costs, and equipment The effect of cheap and easy-to-obtain raw materials

Inactive Publication Date: 2019-08-16
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

However, the shorter the sludge age during the simultaneous denitrification and phosphorus removal of the traditional biological method, the higher the phosphorus content in the sludge, so it must be operated under a high load, but the sludge age is required to be longer in the denitrification process, and nitrification can only be performed in It can only be carried out in a low-load system with a long sludge age, so there is a certain contradiction in the sludge age of biological nitrogen and phosphorus removal, and this contradiction is more obvious when the water temperature is low
And when chemical phosphorus removal is added at the same time, it will have a certain impact on the growth of microorganisms
The remaining sludge produced by the use of biological methods is also a major hidden danger for environmental protection

Method used

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  • Method for synchronously removing nitrate and phosphate in water by adopting three-dimensional electrolysis device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Graphene oxide and copper simple substance were sequentially electroplated on the purchased titanium plate to obtain Cu / GO / Ti electrode.

Embodiment 2

[0025] Using the Cu / GO / Ti electrode prepared in Example 1, the purchased sponge iron and activated carbon particles, the electrolysis test was carried out on the nitrogen and phosphorus solution. The prepared 2 Cu / GO / Ti electrodes are used as cathodes, placed on both sides, and the purchased chlorine analysis plate is used as an anode, placed in the middle, and the electrodes are placed in the middle and upper part of the solution. NaCl and anhydrous sodium sulfate are added to the solution. Spread the gauze under the solution and fix it to carry the iron-carbon particles, and the magnetic stirring rotor is placed at the bottom. Among them, the effective area of ​​the electrode is 9cm 2 , the current density is 15mA / cm 2 , the electrolyzed water is 500ml, the iron-carbon mass concentration is 20g / L, the iron-carbon mass ratio is 7:3, the initial concentration of nitrate nitrogen is 30mg / L, the initial concentration of total phosphorus is 5mg / L, the temperature is room tempera...

Embodiment 3

[0027] Same as Example 2, the mass ratio of iron to carbon is 3:2, and other conditions remain unchanged, the final concentration of nitrate nitrogen measured is 14.23mg / L, and the concentration of total phosphorus is 0mg / L in 100min.

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Abstract

The invention provides a method for synchronously removing nitrate and phosphate in water by adopting a three-dimensional electrolysis device. A diaphragm-free electrolytic system is formed by takinga copper / graphene oxide modified titanium electrode plate as a cathode and taking a chlorine evolution electrode plate as an anode; and meanwhile, iron carbon is added into water to form a three-dimensional electrode of a three-dimensional electrode electrolysis system to electrolyze water. Under the action of the current of the electrodes, a large amount of nitrate nitrogen is reduced by utilizing the copper / graphene oxide modified titanium electrode plate, and zero-valent iron of iron-carbon microelectrolysis can also be used for reducing the nitrate nitrogen, wherein the reduction product is ammonia nitrogen; the chlorine evolution electrode is adopted as the anode, and chlorine ions are used as a supporting electrolyte to carry out oxidization at the anode to generate chlorine; then the chlorine is dissolved in water to generate strong oxidant hypochlorous acid, wherein the hypochlorous acid can oxidize the reduction product ammonia nitrogen of nitrates into nitrogen; meanwhile, iron ions generated during a process that the nitrates are reduced by iron elementary substance are precipitated with phosphorus; and further adsorption is conducted by activated carbon, so that the removal effect of total phosphorus is enhanced.

Description

technical field [0001] The invention belongs to the technical field of water treatment and relates to a method for synchronously removing nitrate and phosphate in water by using a three-dimensional electrolysis device. Background technique [0002] Phosphorus, nitrogen and other elements in the water exceed the standard, which will accelerate the eutrophication of the water body. This phenomenon is more serious in our country, and it has brought great harm to industry, aquaculture, agriculture and tourism. The increase in the concentration of nitrogen, phosphorus and other nutrients is the cause of algal blooms, and phosphorus is the key factor. At the same time, excessive nitrate content will also cause harm to the human body and the natural environment. According to the current national regulations, it is mainly applicable to the discharge standards of Class IV water in general industrial water areas and recreational water areas in which the human body does not directly co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F101/16C02F101/10
CPCC02F1/461C02F2101/105C02F2101/163
Inventor 王家宏杨宁
Owner SHAANXI UNIV OF SCI & TECH
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