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Preparation method and application of supported metal oxide catalyst for removing ammonia nitrogen in water through catalytic ozonation

A technology of ozone oxidation and metal loading, which is applied in the field of industrial water treatment to achieve the effect of easy industrialization, good catalytic ozone oxidation to remove ammonia nitrogen, and simple operation

Inactive Publication Date: 2017-05-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the application of catalytic ozonation technology to the removal of ammonia nitrogen in industrial wastewater.

Method used

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  • Preparation method and application of supported metal oxide catalyst for removing ammonia nitrogen in water through catalytic ozonation
  • Preparation method and application of supported metal oxide catalyst for removing ammonia nitrogen in water through catalytic ozonation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Co 3 o 4 -Al 2 o 3 Catalyst preparation

[0020] Select 3-5mm γ-Al 2 o 3 The microspheres are used as the catalyst carrier, washed twice with deionized water, then soaked overnight with 0.10mol / L dilute hydrochloric acid, finally washed with deionized water until the effluent is neutral, and dried at 100±2°C to obtain the activated γ-Al 2 o 3 microspheres; activated γ-Al 2 o 3 The microspheres are impregnated in a cobalt nitrate impregnation solution with a concentration of 0.05mol / L for 15 hours, then dried at 100±2°C for 4 hours, and then roasted at 600±10°C for 4 hours to obtain Co 3 o 4 -Al 2 o 3 catalyst.

Embodiment 2

[0021] Example 2: Co 3 o 4 -Al 2 o 3 Catalytic Ozone Oxidation Performance of Catalyst

[0022] 100g of prepared Co 3 o 4 -Al 2 o 3 Catalyst loaded as attached figure 1 In the reaction device shown, add 1.0L, 200mg / L ammonium chloride simulated waste water, control the reaction temperature at 25°C by water bath circulation, feed ozone gas, the gas flow rate is 1.0L / min, and the concentration is 2.4mg / L , take samples at intervals of 1h to measure the concentration of ammonia nitrogen in the solution, and react for 6h to complete the catalytic ozonation process. For comparison, the γ-Al 2 o 3 Blank spheres and ozone alone repeat the above ozone oxidation process. Experimental reaction 6h, with Co 3 o 4 -Al 2 o 3 When used as a catalyst, the removal rate of ammonia nitrogen is close to 100%, while adding γ-Al 2 o 3 The removal rates of ammonia nitrogen were only 15% and 18% for the blank sphere and the ozone process alone, which indicated that the prepared Co 3...

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Abstract

The invention provides a preparation method and application of a supported metal oxide catalyst for removing ammonia nitrogen in water through catalytic ozonation. The preparation method comprises the steps of impregnating a catalyst carrier subjected to activating treatment in an impregnating solution formed through mixing any two metal salts of cobalt, manganese, cerium, iron, nickel, magnesium and copper for a certain time, then drying, and roasting to obtain the supported metal oxide catalyst. The preparation method is green and environmental-friendly, simple to operate, and easy for industrialization. By applying the supported metal oxide catalyst prepared by the invention, ammonia nitrogen can be converted into nitrogen at the normal temperature and the normal pressure so as to be effectively removed. Co3O4-Al2O3 is adopted as a catalyst for reacting for 6h, and the removal rate of the ammonia nitrogen of 200mg / L of ammonium chloride stimulated wastewater approximates to 100 percent, so that the supported metal oxide catalyst has a better effect on removing the ammonia nitrogen through catalytic ozonation.

Description

technical field [0001] The invention relates to the technical field of industrial water treatment, in particular to a preparation method and application of a loaded metal oxide catalyst that catalyzes ozone oxidation to remove ammonia nitrogen in water. Background technique [0002] Papermaking, textile, petrochemical, pharmaceutical and tanning fields will produce a large amount of high-concentration ammonia nitrogen wastewater in the production process, and the ammonia nitrogen concentration of some wastewater will exceed 1000mg / L. High-concentration ammonia-nitrogen wastewater directly discharged into the water without treatment will cause eutrophication, destroy the ecological balance of the water body, and have a significant impact on the receiving water body. At present, the most widely used biological method is the denitrification treatment method, which has the characteristics of simple operation, stable effect, low treatment cost and less secondary pollution. Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75C02F1/72C02F101/16
CPCB01J23/75B01J23/002C02F1/725C02F2101/16
Inventor 徐晓晨张若羽吴宗蔚陈捷杨凤林宋帅楠姜宏斌
Owner DALIAN UNIV OF TECH
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