Method for removing nitrate nitrogen, corresponding combination preparation, and preparation method and application thereof

A technology of nitrate nitrogen and composite preparations, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of long storage time of nano-iron, poor chemical stability, Easy to agglomerate and other problems, to achieve the effect of convenient operation, increased reaction rate constant, and low purity requirements

Inactive Publication Date: 2009-12-30
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, there are a series of practical problems such as poor chemical stability, easy oxidation, and easy agglomeration of nano-iron due to long storage time.

Method used

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  • Method for removing nitrate nitrogen, corresponding combination preparation, and preparation method and application thereof
  • Method for removing nitrate nitrogen, corresponding combination preparation, and preparation method and application thereof
  • Method for removing nitrate nitrogen, corresponding combination preparation, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The nitrate concentration in deionized water was set at 10 mg / L, and the pH was 5.5. Different formulations of composite nano-iron materials were added to carry out the nitrate degradation test. The instruments and equipment used in the test process are shown in Table 1.

[0037] Table 1 Instruments and equipment used in the test

[0038]

[0039] Calculated according to the concentration of substances in water, the dosage of nano-iron is 5g / L, and the dosage of aluminum sulfate is 0mg / L, 30mg / L, 50mg / L, 65mg / L, 80mg / L, 100mg / L. Below, the curve of nitric acid concentration changing with time is as follows figure 1 shown.

[0040] From figure 1 It can be clearly seen that as the content of aluminum sulfate in the composite nano-iron material increases, the removal rate and removal rate of nitrate increase significantly. Corresponding to different composite nano-iron materials, the removal rates of nitrate reached 51%, 57%, 61%, 70%, 76% and 83% after 6 hours of re...

Embodiment 2

[0041] Example 2: The equipment used in the test is shown in Table 1. When the initial concentration of nitrate is 5mg / L, pH is 5.5 and under normal temperature conditions, after 6 hours of reaction, the composite nano-iron (the material ratio in the composite nano-iron is: nano-iron 98%, aluminum sulfate 2%) dosage The nitrate removal rates were 22%, 29%, 38%, 54%, 61%, and 83% when they were 0.5g / L, 1g / L, 2.5g / L, 3g / L, 4g / L, and 5g / L, respectively. %, 88%, see figure 2 . On the one hand, the increase in the dosage of composite nano-iron increases the concentration of substrate reactants and increases the driving force of the reaction; Under the joint action of the two, the rate of reduction reaction and the removal rate of nitrate are effectively improved.

Embodiment 3

[0042] Example 3: The equipment used in the test is shown in Table 1. The dosage of composite nano-iron is 5g / L (nano-iron 98%, aluminum sulfate 2%), when the pH is 5.5, the initial concentration of nitrate nitrogen is 1, 3, 5, 10, 20, 30, 50mg / L respectively , the removal rate of nitrate after 6h at normal temperature is 92%, 89%, 85%, 83%, 68%, 53%, 44%, the results are detailed in image 3 . It can be seen that this technical method has a good removal effect for different initial concentrations of nitrate.

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Abstract

The invention relates to a method for removing nitrate nitrogen which can effectively improve the rate of the reaction that nitrate in water is reduced with nano-iron and the removal rate of nitrate nitrogen by adding nano-iron and aluminum salt or iron salt catalyst in nitrate to react. A combination preparation is prepared by the method that firstly nano-iron and aluminum salt or iron salt catalyst are added in a sealed container containing acetone and then the container is irradiated by ultrasound and stirred. The combination preparation has good chemical stability, can directly remove the nitrate pollutants in water and has simple process and convenient operation.

Description

technical field [0001] The invention relates to a composite nano-iron material for nitrate nitrogen, which is suitable for rapid removal of nitrate in surface water, landscape water and underground water and artificial restoration of other water bodies. Background technique [0002] Due to the combined effects of a large amount of nitrogen fertilizer application in rural areas, substandard discharge of domestic sewage and nitrogen-containing industrial wastewater, and unreasonable recharge of sewage, surface and groundwater nitrate nitrogen (NO 3 --N) has now become one of the issues of general concern at home and abroad. When drinking water with a high concentration of nitrate, humans and animals can lead to hypoxia and suffer from methemoglobinemia. In addition, in the acidic anaerobic environment of the esophagus and gastrointestinal system, it is easily reduced to nitrite, and then combined with secondary amines. The reaction forms a direct carcinogen - nitrosamines, so...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F1/70B01J27/128B01J27/125B01J27/053B01J23/745C02F101/16
Inventor 严烈徐斌高乃云夏圣骥李大鹏
Owner TONGJI UNIV
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