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Preparation method of modified fly ash for treating ammonia nitrogen waste water

A technology of ammonia nitrogen wastewater and fly ash, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of low adsorption performance of fly ash and less research, etc. Achieve the effect of good ammonia nitrogen removal effect, wide source of raw materials, and reduce the cost of raw materials

Inactive Publication Date: 2012-02-22
HUAQIAO UNIVERSITY
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  • Description
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AI Technical Summary

Problems solved by technology

Fly ash has a special spatial structure of Al-O tetrahedron and Si-O tetrahedron, with negative charges on the surface and ion exchange performance. However, the adsorption performance of the original fly ash is not high, and it needs to be modified to improve the adsorption performance
At present, the modification methods of fly ash mainly include acid modification, alkali modification, salt modification, surfactant modification, mixing modification and other methods. After modification, the fly ash can improve its resistance to different The removal rate of different types of wastewater, but there are few studies on the treatment of ammonia nitrogen wastewater by fly ash. Turn waste into treasure, realize waste treatment with waste, and achieve a win-win situation of economic and environmental benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Put the raw material fly ash (10μm-300μm) in 0.5 mol / liter sodium hydroxide solution, make the solid-liquid ratio 1:10, soak for 10 hours at the reaction temperature of 90°C, then use soft water to remove calcium and magnesium Wash and dry to obtain modified fly ash.

[0017] Ammonia nitrogen wastewater (pH value is 7, ammonia nitrogen content is more than 150mg / liter) flows through the device equipped with the modified fly ash obtained in embodiment 1, the ammonia nitrogen in the wastewater can be removed, and the ammonia nitrogen removal rate can reach more than 80% .

Embodiment 2

[0019] Put the raw material fly ash (10m-300μm) in a 5 mol / L sodium hydroxide solution to make the solid-liquid ratio 1:5, soak it at a reaction temperature of 50°C for 5 hours, and then use soft water to remove calcium and magnesium Wash and dry to obtain modified fly ash.

[0020] Ammonia nitrogen wastewater (pH value is 5, ammonia nitrogen content is more than 80mg / liter) flows through the device equipped with the modified fly ash obtained in Example 2, the ammonia nitrogen in the wastewater can be removed, and the ammonia nitrogen removal rate can reach more than 75%. .

Embodiment 3

[0022] Put the raw material fly ash (10m-300μm) in 8 mol / L sodium hydroxide solution so that the solid-liquid ratio is 1:3, after soaking for 0.5 hours at a reaction temperature of 10°C, use soft water to remove calcium and magnesium Wash and dry to obtain modified fly ash.

[0023] Ammonia nitrogen wastewater (pH value is 10, ammonia nitrogen content is more than 250mg / liter) flows through the device equipped with the modified fly ash obtained in embodiment 3, the ammonia nitrogen in the wastewater can be removed, and the ammonia nitrogen removal rate can reach more than 88%. .

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Abstract

The invention discloses a preparation method of modified fly ash for treating ammonia nitrogen waste water. The preparation method comprises the following steps of immersing a raw material of fly ash in 0.5 to 8 mol / L of a sodium hydroxide solution for 0.5 to 10 hours under the conditions of a temperature of 10 to 90 DEG C and a solid-liquid ratio of 1: (2 to 10); washing by soft water which does not contain calcium and magnesium, and drying to obtain the modified fly ash. When ammonia nitrogen waste water flows through a device loaded with the modified fly ash, ammonia nitrogen in the ammonia nitrogen waste water can be removed and an ammonia nitrogen removal rate reaches above 75%.

Description

technical field [0001] The invention relates to a modified fly ash which can be used to treat wastewater containing ammonia nitrogen, in particular to a preparation method of the modified fly ash. Background technique [0002] The discharge of ammonia nitrogen wastewater is a major source of pollution in nitrogen fertilizer plants. After a large amount of ammonia nitrogen wastewater is injected into rivers and lakes, it will cause eutrophication in a large area of ​​natural ecology, which not only destroys the ecological balance, but also brings great difficulties to the pretreatment of industrial water due to serious water pollution in some areas. At present, the treatment methods of ammonia nitrogen wastewater include biological method, break point chlorination method and adsorption method. The biological method has very high requirements in actual production, and the denitrification effect is not stable enough; the breakpoint chlorination method needs to add a large amou...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F101/16
Inventor 李宝霞翁连进陈婉妹
Owner HUAQIAO UNIVERSITY
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