Method for treating urea wastewater through nickel-based chemical looping oxidation

An oxidation treatment and chemical oxidation technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of easy production of ammonia and high cost, and achieve small environmental factors and easy operation simple effect

Pending Publication Date: 2021-11-19
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of the existing urea degradation method, such as high cost, easy ammonia production, and the need to strictly control environmental conditions, the present invention provides a method for treating urea wastewater by nickel-based chemical chain oxidation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Nickel-cobalt double metal oxide (NiCo LDH) as a media material for the degradation of urea wastewater

[0031] 1) Ni(NO 3 ) 2· 6H 2 O and Co(NO 3 ) 2· 6H 2 O was dissolved in ultrapure water to form a 50 mL solution with a total metal ion concentration of 1.2 M, and 50 mL of 2 M KOH solution was added to the solution and mixed vigorously for 1 h, the precipitate was washed by centrifugation, and then freeze-dried for 18 h to form NiCo bis metal layered hydroxide;

[0032] 2) Mix NiCo LDH, acetylene carbon black and polyvinylidene fluoride (PVDF) with nitrogen-methyl-2-pyrrolidone (NMP) at a mass ratio of 7:2:1 to form a slurry;

[0033] 3) Apply the above slurry evenly on the nickel foam of 5cm*5cm*1.6 mm, let it dry naturally and put it into a roller press to compress to a thickness of 200 µm;

[0034] 4) Put the nickel foam coated with the active material into a vacuum drying oven, and dry it under vacuum at room temperature for 12 h, and the net weight of the...

Embodiment 2

[0041] Ni 2 P as a media material to degrade urea wastewater

[0042] 1) Ni(NO 3 ) 2· 6H 2 O was dissolved in ultrapure water to obtain a 50 mL solution with a concentration of 1.2 M, and 50 mL of 2 M NaOH solution was added to the solution and mixed vigorously for 1 h, the precipitate was washed by centrifugation, and then freeze-dried for 18 h to obtain Ni(OH) 2 ;

[0043] 2) Ni(OH) 2 After drying, mix evenly with sodium hypophosphite according to the weight ratio of 3:1, put it into a quartz boat, place it in a quartz tube, seal it and place it in N 2 Under protection, heat up to 350°C and keep it warm for 2 hours to get Ni 2 P material;

[0044] 3) put Ni 2 P, acetylene carbon black and polyvinylidene fluoride (PVDF) are mixed with nitrogen-methyl-2-pyrrolidone (NMP) in a mass ratio of 7:2:1 to form a slurry;

[0045] 4) Spread the above slurry evenly on the nickel foam of 5cm*5cm*1.6 mm, let it dry naturally, put it into a roller press and compress it to a thickn...

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PUM

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Abstract

The invention discloses a method for treating urea wastewater through nickel-based chemical looping oxidation. The method comprises the following steps: oxidizing a nickel-based material to a high valence state; and placing the nickel-based material in the oxidation state in a urea solution, and carrying out oxidative degradation on urea, wherein the nickel-based material comprises a nickel element-containing unitary or multielement hydroxide, oxide, phosphide, selenide, nitride, sulfide, an alloy material, a metal organic framework material, perovskite and a nickel element-loaded composite material. According to the method, the nickel-based material is used as a medium to oxidize urea, nitrogen and CO2 are generated with high selectivity, and secondary pollutants such as NO3<-> and the like are not generated; and the method for treating urea wastewater does not involve a microbial electrode, does not need catalytic enzyme, and is slightly influenced by environmental factors.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating urea wastewater by nickel-based chemical chain oxidation. Background technique [0002] As an organic substance, urea is easily hydrolyzed to generate ammonia in the water environment. When the ammonia content in the water body is too high, it will cause serious harm to the environment. In addition, urea itself, as a pollutant, often enters the soil environment with industrial wastewater and farmland leachate, and may seep into groundwater for human and other organisms to drink. After urea enters the human body and exceeds the absorption capacity, it will cause damage to the liver, kidney, alveoli and other organs of the human body, thus threatening human health. Therefore, how to effectively remove urea in water without generating secondary pollution such as ammonia is an urgent problem to be solved to ensure environmental quality and maintai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/38
CPCC02F1/72C02F2101/38
Inventor 王海涛展思辉李铁龙
Owner NANKAI UNIV
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