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Ceramic flat membrane for oily sewage treatment and preparation method thereof

A flat membrane and oily sewage technology, applied in the direction of osmosis/dialysis water/sewage treatment, chemical instruments and methods, membranes, etc., can solve the problems of flux drop, oil clogging, etc., to improve infiltration and adhesion, reduce oil clogging, The effect of simple process

Active Publication Date: 2019-07-19
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For sewage treatment with severe oil pollution, oil pollution often occurs during membrane filtration.
Simple oleophobic treatment will cause a decrease in flux

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Add glacial acetic acid and water to ethanol, stir evenly, add ethyl orthosilicate, and stir for 2 hours. The volume ratio of glacial acetic acid to ethyl orthosilicate is 1:1, the volume ratio of the total amount of glacial acetic acid and ethyl orthosilicate to ethanol is 2%, and the volume of water to ethanol is 2%.

[0028] (2) Add fluoroalkylsiloxane and stir for 2h. The molar ratio of the added amount of fluoroalkyl siloxane to ethyl orthosilicate is 1:1.

[0029] (3) Immerse the finished corundum ceramic flat membrane in the modified sol, and ultrasonically immerse it for 3 hours.

[0030] (4) drying at 50° C. to obtain a ceramic flat membrane product covered with a hydrophilic and oleophobic membrane.

[0031] The porosity of the obtained product is 39.8%, the average pore diameter is 1.8μm, the strength is 18.8MPa, and the water flux is 2.2m 3 / h·m 2 .

Embodiment 2

[0033] (1) Add glacial acetic acid and water to ethanol, stir evenly, add methyl orthosilicate, and stir for 2 hours. The volume ratio of glacial acetic acid and methyl orthosilicate is 3:1, the total volume of glacial acetic acid and methyl orthosilicate accounts for 5% of ethanol, and the volume of water accounts for 5% of ethanol.

[0034] (2) Add fluoroalkylsiloxane and stir for 2h. The molar ratio of the added amount of fluoroalkyl siloxane to the silicate is 1:3.

[0035] (3) Immerse the finished SiC ceramic flat membrane in the modified sol, and ultrasonically immerse it for 3 hours.

[0036] (4) drying at 80° C. to obtain a ceramic flat membrane product covered with a hydrophilic and oleophobic membrane.

[0037] The porosity of the obtained product is 40.2%, the average pore diameter is 1.6μm, the strength is 19.6MPa, and the water flux is 1.8m 3 / h·m 2 .

Embodiment 3

[0039] (1) Add oxalic acid and water to ethanol, stir evenly, add ethyl orthosilicate, and stir for 1 hour. The volume ratio of oxalic acid and tetraethyl orthosilicate is 2:1, the volume ratio of the total amount of oxalic acid and tetraethyl orthosilicate to ethanol is 8%, and the volume of water is 2.5% of ethanol.

[0040] (2) Add fluoroalkyl siloxane and stir for 2 hours. The molar ratio of fluoroalkyl siloxane to ethyl orthosilicate is 1:2.5.

[0041] (3) Immerse the finished corundum ceramic flat membrane in the modified sol, and ultrasonically immerse it for 3 hours.

[0042] (4) drying at 70° C. to obtain a ceramic flat membrane product covered with a hydrophilic and oleophobic membrane.

[0043] The porosity of the obtained product is 38.2%, the average pore diameter is 1.9μm, the strength is 20.4MPa, and the water flux is 1.9m 3 / h·m 2 .

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PUM

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Abstract

The invention discloses a ceramic flat plate film for treating oil-containing wastewater and a preparation method thereof, and belongs to the field of inorganic films. The preparation method specifically comprises the following steps of uniformly mixing organic acid, water and ethyl alcohol, and adding silicate to react; adding fluoroalkyl siloxane to react, so as to obtain modified sol; impregnating the ceramic flat plate film into the obtained modified sol, and drying. The preparation method has the advantages that by adopting the manner of impregnating into the low-concentration modified sol by ultrasonic waves, the hydrophilic and oleophobic properties of a ceramic flat plate film material are improved, and the hydrophilic and oleophobic properties of the film material are enhanced; the technology is simple, economical and efficient, and the purifying efficiency and anti-pollution ability of the film material to the wastewater with serious oil dirt are favorably improved.

Description

technical field [0001] The invention belongs to the field of inorganic membranes, and in particular relates to a ceramic flat membrane for oily sewage treatment and a preparation method thereof. Background technique [0002] Ceramic flat membrane is a new type of filter material that can be used in the field of sewage treatment. Compared with organic membranes, it has many advantages such as high mechanical strength, high temperature resistance, acid and alkali corrosion resistance, and has achieved rapid development and wide application in the field of water treatment in recent years. . Membrane fouling in the sewage treatment process seriously affects the service life of the filter membrane. The main reason is that organic pollutants adhere to the surface of the membrane, which blocks the membrane pores, reduces the water flux, and even completely loses the filtration function of the membrane material. The ability of the membrane material to treat sewage can be effectivel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D69/06B01D69/02B01D67/00C02F1/44
CPCB01D67/0039B01D69/02B01D69/06B01D71/02B01D2325/36C02F1/44
Inventor 王响赵世凯薛友祥唐玉栋张久美马腾飞李冰翠侯立红李小勇
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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