Ozone oxidation catalyst for wastewater treatment and application method thereof

An ozone oxidation and wastewater treatment technology, applied in the field of water treatment, can solve the problems of poor stability, low catalytic efficiency, poor hydrodynamic performance, etc., and achieve the effects of high stability, large specific surface area, and high mechanical strength

Active Publication Date: 2022-02-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of poor hydrodynamic performance, low catalytic efficiency and poor stability of existing ozone oxidation catalysts in wastewater treatment, the present invention provides a highly efficient cerium-based multi-metal oxide mesoporous millimeter sphere ozone oxidation catalyst and its application method

Method used

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  • Ozone oxidation catalyst for wastewater treatment and application method thereof
  • Ozone oxidation catalyst for wastewater treatment and application method thereof
  • Ozone oxidation catalyst for wastewater treatment and application method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A wastewater treatment ozone oxidation catalyst has the following characteristics:

[0048] (1) The catalyst contains aluminum, copper, cerium and oxygen, the mass fraction of aluminum is 43%, the mass fraction of copper is 1.4%, the mass fraction of cerium is 1.6%, and the mass fraction of oxygen is 39% %, its X-ray fluorescence imaging (see figure 1 ) shows that the above-mentioned metal elements are uniformly distributed throughout the catalyst sphere;

[0049] (2) The catalyst is composed of composite metal oxides containing aluminum, copper, and cerium, and all components except alumina include γ-Al 2 o 3 Except crystal form, other components are amorphous, and described catalyst X-ray diffraction spectrum (see figure 2 ) in addition to γ-Al 2 o 3 Does not contain other crystalline substance diffraction peaks;

[0050] (3) The morphology of the catalyst is a mesoporous millimeter sphere, and the particle size distribution is in the range of 3 to 5 mm. It is ...

Embodiment 2

[0058] A wastewater treatment ozone oxidation catalyst has the following characteristics:

[0059] (1) The catalyst contains aluminum, copper, cerium and oxygen, the mass fraction of aluminum is 46%, the mass fraction of copper is 2.3%, the mass fraction of cerium is 1.2%, and the mass fraction of oxygen is 42% %;

[0060] (2) The catalyst is composed of composite metal oxides containing aluminum, copper, and cerium, and all components except alumina include γ-Al 2 o 3 Except for the crystal form, other components are amorphous, except for γ-Al in the X-ray diffraction spectrum of the catalyst 2 o 3 Does not contain other crystalline substance diffraction peaks;

[0061] (3) The morphology of the catalyst is a mesoporous millimeter sphere, and the particle size distribution is in the range of 3 to 5 mm. It is tested by the method specified in "HG / T 3927-2020 Industrial Activated Alumina". The compressive strength is 150N / particle, and the tap density is 0.76g / cm 3 , the ...

Embodiment 3

[0073] The catalyst described in embodiment 1 also has the following features or beneficial effects:

[0074] (1) The catalyst is active in catalytic ozonation degradation for oxalic acid (see Figure 4 ), the catalyst contacts with the oxalic acid solution E1 with a solid-to-liquid ratio of 50g / L and adds 0.8mol O to the solid-liquid mixture with every liter of liquid 3 The rate of removal of oxalic acid is 99% after feeding the gas F containing ozone at the dosage of / min for 30 minutes, and the removal rate of oxalic acid is 22% under the ozone oxidation treatment under the same conditions without a catalyst. Increased by 77 percentage points, the oxalic acid solution E1 is an aqueous solution of oxalic acid, the concentration of oxalic acid is 1.1mol / L, and the pH of the solution is 7.0, and the ozone-containing gas F is a mixed gas of ozone and oxygen; When the duration of ozone gas F is extended to 60min, the removal rate of oxalic acid is 99% when the catalyst is added...

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Abstract

The invention relates to an ozone oxidation catalyst for wastewater treatment and an application method thereof, and belongs to the technical field of water treatment. The catalyst provided by the invention has efficient and stable catalytic activity, excellent fluid mechanical properties, rich pore structures, relatively high mechanical strength, proper variable valence activity, adsorption activity, catalytic ozonolysis activity and catalytic ozonolysis degradation activity, is suitable for reactors such as a bubble tower, and can be produced on a large scale. Compared with single ozone oxidation or ceramsite-based catalysts, the catalyst has the advantages that the actual wastewater organic pollutant degradation efficiency is greatly improved, the catalyst can be used for strengthening complex-state heavy metal ozone oxidation complex breaking and free heavy metal release, the efficiency of converting organophosphorus, hypophosphite, phosphite and the like into orthophosphate through ozone oxidation can be improved, the operation effect is stable, and the catalyst is suitable for advanced treatment of industrial wastewater and industrial park wastewater.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to an ozone oxidation catalyst for wastewater treatment and an application method thereof. Background technique [0002] As a new type of green and clean oxidant, ozone has been widely used in the field of wastewater treatment. However, ozone oxidation alone can only remove part of the organic matter, and the efficiency of deep mineralization and degradation of organic matter is low, so the actual application effect is not good. Ozone is decomposed into more oxidizing active oxygen species under the catalytic action of the catalyst, which can greatly improve the efficiency of ozone oxidation, reduce the amount of ozone to save costs, and improve the removal efficiency of various pollutants. [0003] The active components of catalysts used in ozone catalytic oxidation are generally transition metal elements, and the types mainly include transition metal oxides, transition met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J35/02B01J35/08B01J35/10C02F1/72C02F1/78C02F101/10C02F101/20C02F101/30C02F101/34
CPCB01J35/023B01J35/08B01J35/1019B01J35/1038B01J23/83C02F1/725C02F1/78C02F2101/105C02F2101/34C02F2101/20C02F2101/30
Inventor 单超潘丙才封睿张炜铭
Owner NANJING UNIV
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