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Method for removing total nitrogen in water by nanometer zero-valent iron combined ion exchange resin and use thereof

A technology of ion exchange resin and nanometer zero-valent iron, applied in the direction of ion exchange water/sewage treatment, chemical instruments and methods, water pollutants, etc., can solve problems such as secondary pollution of water bodies, and achieve effective removal and removal of ammonia nitrogen pollution, The effect of reducing secondary pollution

Inactive Publication Date: 2017-07-14
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nitrite and ammonia nitrogen produced by the reaction will cause secondary pollution to the water body. Therefore, it is necessary to find a method that can reduce the total nitrogen content in water.

Method used

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  • Method for removing total nitrogen in water by nanometer zero-valent iron combined ion exchange resin and use thereof
  • Method for removing total nitrogen in water by nanometer zero-valent iron combined ion exchange resin and use thereof
  • Method for removing total nitrogen in water by nanometer zero-valent iron combined ion exchange resin and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Preparation method of material S-NZVI, the steps are:

[0039] 1) Take 5ml waste acid (90.86g / L iron content) and 100ml ethanol solution and add to the triangular conical flask

[0040] Medium, stir for a period of time on a magnetic stirrer;

[0041] 2) Blow in nitrogen to remove oxygen, add a certain quality of sodium borohydride, and place the solution on the magnetic plate after the reaction

[0042] Precipitate, wash with water and ethanol three times successively, put into a vacuum drying box and ventilate nitrogen, temperature 80℃,

[0043] After drying for 8 hours, it is opened after cooling, and ground into powder, and put in a vacuum bag for use.

[0044] figure 1 TEM and SEM images of the material S-NZVI prepared in Example 1. by figure 1 It can be seen that the particle size of the nano metal particles is basically in the range of 20-40 nm, and the appearance is spherical. It can be seen from the transmission electron microscope image that the black nano-m...

Embodiment 2

[0046] Example 2: The effect of the dosage of material S-NZVI on the removal rate of nitrate nitrogen, the steps are:

[0047] 1) Take 50mL potassium nitrate solution into a 100mL Erlenmeyer flask, respectively take 0.04g, 0.06g, 0.08g, 0.12g, 0.14g, 0.16g material S-NZVI into the Erlenmeyer flask;

[0048] 2) The mixture is reacted in a shaker for 4 hours at a temperature of 28±1°C and a speed of 200r / min. Separate the reacted solution magnetically, pass a 0.45 micron filter membrane, and detect the concentration of nitrate in the mixed solution by ultraviolet spectrophotometry.

[0049] Under the condition of nitrate nitrogen concentration of 20mg / L, dosing different amounts of nano-zero-valent iron on its removal rate is shown in the experimental results image 3 . When the reaction time is 4h, when the dosage of S-NZVI is 0.8g / L, the removal rate of nitrate nitrogen is 35.19%. When the dosage is 1.2g / L, the removal rate is 64.18%. When the dosage of S-NZVI is 2.8g / L, the remov...

Embodiment 3

[0050] Example 3: The effect of different pH values ​​on the removal of nitrate and total nitrogen from S-NZVI, the steps are:

[0051] 1) Take 50mL potassium nitrate solution into a 100mL Erlenmeyer flask, adjust the pH of the solution to 3, 5, 7, 9, and 11 respectively, and add 0.14g of material S-NZVI into the solution;

[0052] 2) The mixture is reacted in a shaker for 4 hours at a temperature of 28±1°C and a speed of 200r / min. Separate the reacted solution magnetically, pass a 0.45 micron filter membrane, and detect the concentration of nitrate and total nitrogen in the mixed solution by ultraviolet spectrophotometry.

[0053] Figure 4 It is the effect of different pH values ​​on the removal of nitrate from the material S-NZVI. The removal effect is not high when the initial pH value is too acidic or too basic, and the removal rate is 99% in the acidic environment, that is, the initial pH=5. Because in the heterogeneous reaction, nanomaterials first capture NO by adsorption 3 ...

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Abstract

The invention provides a method for removing total nitrogen in water by nanometer zero-valent iron combined ion exchange resin. Nanometer zero-valent iron is prepared from an iron and steel pickling waste liquid, a certain volume of a waste acid solution is added into a mixed solution of anhydrous ethanol and deoxygenated water, the mixed solution is subjected to magnetic stirring for some time, a certain amount of a reducer is added into the mixture so that a material S-NZVI is obtained, the material S-NZVI and a nitrogen-containing solution undergo a reaction, the supernatant is obtained by a magnetic separation method, and W-type cation exchange resin is added into the supernatant so that the by-product of nitrate degradation is removed. The material S-NZVI has a high nitrate removal rate. The W-type cation exchange resin has good ammonia nitrogen adsorption effects. Through combination of the material S-NZVI and W-type cation exchange resin, ammonia nitrogen pollutants in water are effectively removed.

Description

Technical field [0001] The invention relates to a method for removing total nitrogen in water, in particular to a method for removing total nitrogen in water by combining nano zero-valent iron with ion exchange resin. Background technique [0002] With the rapid development of industry, total nitrogen pollution in water bodies is getting more and more serious. Total nitrogen includes nitrate nitrogen, ammonia nitrogen and nitrite nitrogen. Among them, nitrate reacts with amines, which are the decomposition products of proteins, to generate nitrosamine compounds, increasing the risk of cancer in the human body. If it enters the placenta, it will increase the risk of fetal malformations. For example, infants and young children will have methemoglobinism and other hazards. Nitrate nitrogen removal technologies mainly include physical, biological and chemical methods. Among them, the biological method mainly uses the nitrification and denitrification of microorganisms to convert it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/16
CPCC02F1/42C02F1/70C02F2001/425C02F2101/163
Inventor 方战强李鹏俊王冠
Owner SOUTH CHINA NORMAL UNIVERSITY
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