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Porous ceramic membrane support with flat structure and preparation method thereof

A technology of ceramic membrane support body and porous ceramic membrane, which is applied in the direction of chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of acid and alkali resistance, low service life, and inability to backwash, etc., so as to avoid accumulation or The effect of strain

Active Publication Date: 2012-09-26
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an inorganic membrane that replaces the organic flat membranes or hollow fiber membranes that are commonly used in membrane bioreactors at present, which can not only overcome the low life and insufficiency of traditional membrane bioreactors due to the use of organic hollow fiber membranes. The shortcomings of acid and alkali resistance and the inability of the membrane to be backwashed can reduce the number of membrane cleanings and improve the service life of the membrane. Moreover, the permeation flux can be increased by applying negative pressure to the porous ceramic membrane module, or the reverse pressure can be applied to realize the membrane. Online backwash

Method used

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  • Porous ceramic membrane support with flat structure and preparation method thereof
  • Porous ceramic membrane support with flat structure and preparation method thereof
  • Porous ceramic membrane support with flat structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Mullite (20 μm, 80wt%), starch (20 μm, 10wt%), methyl cellulose (molecular weight 50000, 10wt%) were ball-milled for 4 hours and mixed evenly, then water was added (the volume ratio of mixed powder to water was 1.5:1 ) Ball milled for 4h to make a uniformly dispersed slurry. Then the slurry was put into a mud refiner, and the relative vacuum was 95%, and the mud was refined 6 times. The molding process of the porous ceramic membrane support body can be extrusion molding. The extrusion temperature is 10° C., the extrusion speed is 0.2 m / min, and the extrusion pressure is 6 MPa. When the sintering temperature is 1500°C and the holding time is 2h, the average pore size of the flat ceramic membrane support is 10μm, the porosity is 60%, and the compressive strength is 20MPa. Under the pressure of 0.1MPa, the flux of pure water is 15m 3 / m 2 h.

Embodiment 2

[0031] ZrO 2 (10μm, 88wt%), graphite (10μm, 5wt%), polyvinyl alcohol (molecular weight: 170,000, 5wt%) ball milled for 6h and mixed evenly, then add water (the volume ratio of mixed powder and water is 1.8:1) ball milled for 8h Make a uniformly dispersed slurry. Then put the slurry into a mud refiner with a relative vacuum of 80%, and refine the mud twice. The molding process of the porous ceramic membrane support body can be extrusion molding. The extrusion temperature is 50° C., the extrusion speed is 2 m / min, and the extrusion pressure is 6 MPa. When the sintering temperature is 1550°C and the holding time is 2h, the average pore diameter of the flat ceramic membrane support is 8μm, the porosity is 40%, and the compressive strength is 25MPa. Under the pressure of 0.1MPa, the flux of pure water is 12m 3 / m 2 h.

Embodiment 3

[0033] Will Al 2 o 3 (5 μm, 91wt%), PMMA microspheres (15 μm, 3wt%), carboxymethyl cellulose (molecular weight is 17000, 6wt%) ball milling 8h mixes evenly, then adds water (the volume ratio of mixing powder and water is 1.5: 1 ) Ball milling for 6h to make a uniformly dispersed slurry. Then put the slurry into the mud refiner, the relative vacuum is 90%, and the mud is refined 4 times. The molding process of the porous ceramic membrane support body can be extrusion molding. The extrusion temperature is 30° C., the extrusion speed is 1 m / min, and the extrusion pressure is 8 MPa. When the sintering temperature is 1550℃ and the holding time is 4h, the average pore diameter of the flat ceramic membrane support is 15μm, the porosity is 50%, and the compressive strength is 28MPa. Under the pressure of 0.1MPa, the flux of pure water is 18m 3 / m 2 h.

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Abstract

The invention relates to a porous ceramic membrane support with a flat structure and a preparation method thereof, and belongs to the technical field of ceramic membrane supports. The ceramic membrane support is flat and consists of two flat membrane supports; a certain space is reserved between the two flat membrane supports; at least one supporting column is distributed in the space; and at least one water outlet passage is formed in each flat membrane support, so that flowing resistance of filtrate in the support with the flat structure is reduced. The ceramic aggregate of the support is one or more of alumina, zirconia, silicon dioxide, silicon carbide, titanium oxide, mullite and cordierite; the pore-forming agent is starch, graphite, phenolic resin spheres and the like; and the adhesive is methylcellulose, polyvinyl alcohol and the like. The porosity of the prepared porous ceramic membrane support with the flat structure can reach 30 to 50 percent, the aperture is 20 to 200 nanometers, and the compressive strength can reach 20 to 40MPa; and the support can be used for substituting an organic hollow fiber membrane bioreactor, and has great potential application in the fields of sewage treatment, fine chemical industry and the like.

Description

technical field [0001] The invention relates to a flat plate structure porous ceramic membrane and a preparation method thereof, which can be used to replace the organic flat membrane or hollow fiber membrane commonly used in membrane bioreactors at present. Background technique [0002] Membrane bioreactor is a sewage treatment device that combines biological treatment and membrane separation technology. In the reaction tank that is originally full of microorganisms, biofilm components are added to make the influent water contact with the microorganisms in the reaction tank and undergo decomposition reactions. At the same time, the mixed liquid is driven by a sufficient pressure difference to pass through the membrane of the biofilm group to produce a filtration effect, and the pollution is completely trapped in the reaction tank. The application of the membrane can not only replace the secondary sedimentation tank in the activated sludge process for solid-liquid separation...

Claims

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Application Information

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IPC IPC(8): B01D69/10B01D71/02
Inventor 汪长安刘瑞平黄勇衷待群王迎奎付磊王迎祥
Owner TSINGHUA UNIV
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