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Integrated catalytic membrane ozone gas distributor as well as preparation method and application thereof

A technology of gas distributor and catalytic membrane, which is applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., can solve the problems of destroying organic pollutants, low ozone utilization rate, low solubility, etc., and achieve recovery Difficulty, reduce the volume of equipment, improve the effect of mass transfer efficiency

Inactive Publication Date: 2020-06-09
NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Aiming at the low ozone utilization rate, low solubility, poor stability and secondary pollution caused by the catalyst in the prior art when gas-liquid contact using bubbling, titanium disc, and jet aeration methods is used in ozone catalysis Deficiencies, the present invention uses ceramic membranes for ozone distributors capable of ozone aeration, and at the same time supports an ozone catalytic layer on the surface of the ceramic membranes, realizes ozone aeration through micron-level pores, and provides a new gas-liquid contact method to improve The mass transfer efficiency of ozone, ozone can be evenly and rapidly distributed in the wastewater system through a large number of membrane pores. The overall treatment process effectively utilizes the fluidity of the water body and the diffusivity of the gas, greatly increasing the contact area of ​​the catalyst, ozone and organic matter in the wastewater, and effectively improving the efficiency of wastewater treatment

Method used

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  • Integrated catalytic membrane ozone gas distributor as well as preparation method and application thereof
  • Integrated catalytic membrane ozone gas distributor as well as preparation method and application thereof
  • Integrated catalytic membrane ozone gas distributor as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The preparation method of the catalytic membrane ozone gas distributor of the present embodiment is as follows:

[0040] Step 1: Al(OH) 3 The powder is calcined and calcined at 450°C for 6 hours to convert all of it into γ-Al 2 o 3 ;

[0041] Step 2: Pre-fired γ-Al 2 o 3 The powder is ground into uniform powder particles of 5000-6000 mesh for use;

[0042] Step 3: Wash the powder particles obtained in Step 2 with dilute sulfuric acid and dilute liquid alkali respectively, and finally wash with deionized water until the pH of the effluent is neutral, and dry at 100°C;

[0043] Step 4: Disperse the granular material obtained in step 3 in a solution containing polyvinyl alcohol as a binder, shake evenly to form a smear liquid, and then apply the smear liquid to the outer surface of the ceramic membrane main body by spraying to form a coating at 100°C drying;

[0044] Step 5: The catalytic ceramic membrane coated with the catalytic material in step 4 is fired twice a...

Embodiment 2

[0049] The preparation method of the catalytic membrane ozone gas distributor of the present embodiment is as follows:

[0050] Step 1: Al(OH) 3 The powder is roasted at 550°C for 5 hours to transform it into γ-Al 2 o 3 ;

[0051] Step 2: Pre-fired γ-Al 2 o 3 The powder is ground into uniform powder particles of 7000-8000 mesh for standby;

[0052] Step 3: Wash the powder particles obtained in Step 2 with dilute sulfuric acid and dilute liquid alkali respectively, and finally wash with deionized water until the pH of the effluent is neutral, and dry at 100°C;

[0053] Step 4: Disperse the granular material obtained in step 3 in a solution containing the binder carboxymethyl cellulose, shake it evenly to form a smear liquid, and then apply the smear liquid on the outer surface of the ceramic membrane main body by dipping and pulling to form a coating layer, drying at 100°C;

[0054] Step 5: The catalytic ceramic membrane coated with the catalytic material in step 4 is fi...

Embodiment 3

[0059] The ceramic membrane with ozone catalytic active material of the present embodiment is prepared by the following steps:

[0060] Step 1: Al(OH) 3 The powder is calcined at 650°C for 4 hours to convert all of it into γ-Al 2 o 3 ;

[0061] Step 2: Pre-fired γ-Al 2 o 3 The powder is ground into 9000-10000 mesh uniform powder particles for later use;

[0062] Step 3: Wash the powder particles obtained in Step 2 with dilute sulfuric acid and dilute liquid alkali respectively, and finally wash with deionized water until the pH of the effluent is neutral, and dry at 100°C;

[0063] Step 4: Disperse the granular material obtained in Step 3 in a solution containing a binder and polyvinyl butyral, shake it evenly to form a smear liquid, and then apply the smear liquid to the outer surface of the ceramic membrane body by spin coating to form Coating, drying at 100°C;

[0064] Step 5: The catalytic ceramic membrane coated with the catalytic material in step 4 is fired twice ...

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Abstract

The invention belongs to the field of wastewater treatment, and discloses an integrated catalytic membrane ozone gas distributor as well as a preparation method and application thereof. The integratedcatalytic membrane ozone gas distributor takes a ceramic membrane with micron-sized pore channels as a main body, and an ozone active catalytic material layer is loaded on the outer surface of the ceramic membrane. The main component of the catalytic material layer comprises gamma-Al2O3. The integrated catalytic membrane ozone gas distributor disclosed by the invention can be effectively used foradvanced treatment of degradation-resistant fine chemical wastewater in industries such as medicines, pharmacy, dyes, petrochemical engineering and intermediates. The ceramic membrane is used in theozone distributor for ozone aeration and a catalyst carrier at the same time, ozone aeration and ozone catalysis are achieved through micron-scale pore channels in the surface of the ceramic membrane,the ozone utilization efficiency is improved through cooperation of the ozone distributor and the catalyst carrier, and therefore the wastewater treatment efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and more specifically relates to an integrated catalytic membrane ozone gas distributor, a preparation method and an application. Background technique [0002] The treatment of refractory fine chemical wastewater in industries such as pharmaceuticals, pharmaceuticals, dyes, petrochemicals, and intermediates is a typical representative of refractory industrial wastewater. Problems that need to be solved urgently. [0003] Advanced Oxidation Technology (AOPs) uses the generated hydroxyl radicals to quickly mineralize organic pollutants or improve the biochemical properties of wastewater, and has many advantages such as fast reaction speed, wide adaptability, and strong oxidation ability. Ozone has a strong oxidizing ability and can directly mineralize organic matter into substances with smaller molecular weights. [0004] Catalytic ozone oxidation is a typical advanced oxidation tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/78C02F101/30
CPCC02F1/78C02F1/725C02F2101/30
Inventor 卞为林张威王林刚王津南李爱民施鹏
Owner NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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