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A kind of preparation method of the flat film that is used for sludge thickening

A technology of sludge concentration and flat membrane, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. Concentration and reduction of membrane pure water flux, etc., to achieve high strength, strong anti-pollution performance, and good anti-pollution performance.

Active Publication Date: 2020-12-29
SHANGHAI ZIZHENG ENVIRONMENT PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN102294180A provides a kind of nano TiO 2 A method for preparing a modified PVDF ultrafiltration membrane, the principle of which is to mix nano-TiO in the casting solution 2 , the modified ultrafiltration membrane is prepared to improve the hydrophilicity, but the pure water flux of the modified ultrafiltration membrane is not high, so it cannot be used for sludge concentration
CN106823829A provides a kind of preparation method of superhydrophobic PVDF membrane, and this method discloses a kind of superhydrophobic PVDF hollow fiber membrane with micro-nano double microstructure, effectively relieves membrane wetting, but the PVDF hollow fiber membrane prepared by this method The microspheres formed on the surface will block the membrane pores and reduce the pure water flux of the membrane

Method used

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  • A kind of preparation method of the flat film that is used for sludge thickening

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Experimental program
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Effect test

Embodiment 1

[0024] 42.5% (w / w) dimethyl sulfoxide, 42.5% (w / w) N-methyl-2-pyrrolidone, 4% (w / w) triton, 5% (w / w) Add polyvinyl alcohol in the jar according to certain order, stir; Then add the PVDF of 6% (w / w), stir simultaneously, put into 80 ℃ oven after mixing evenly, make film-casting liquid; After 5d, put The casting solution is evenly coated on the non-woven fabric substrate with a flat scraping machine, the non-woven fabric is immersed in a coagulation bath for phase inversion, and then the flat film is immersed in glycerin for post-treatment, and after drying at room temperature, it is used for sludge Concentration treated PVDF flat sheet membrane. The flat membrane used for sludge concentration prepared according to the preparation scheme was soaked in deionized water for 24 hours, then placed in a vacuum oven at 50°C to obtain a dried PVDF membrane, and the pore size of the membrane surface was observed with a scanning electron microscope.

Embodiment 2

[0026] 42.2% (w / w) dimethyl sulfoxide, 42.2% (w / w) dimethylformamide, 0.05% (w / w) polyethylene glycol, 0.5% (w / w) pentadiene Add the aldehydes into the jar according to a certain order, and stir at the same time; then add 15% (w / w) PVDF, stir at the same time, mix evenly and put it in an oven at 80°C to prepare the casting solution; after 5 days, cast the film The liquid is evenly coated on the non-woven fabric base material with a flat film scraping machine, and the non-woven fabric is immersed in a coagulation bath for phase inversion, and then the flat film is immersed in glycerin for post-treatment, and after drying at room temperature, it is used for sludge concentration treatment. PVDF membrane.

[0027] The pure water flux under the pressure of 30kPa of a kind of PVDF membrane that can be used for sludge thickening prepared in the present embodiment is 3598.85L / (m 2 h), when filtering activated sludge, the membrane flux is 90L / (m 2 h).

[0028] The method for measuri...

Embodiment 3

[0032] The solvent dimethylformamide is replaced by triethyl phosphate, and the others are the same as in Example 2. Then, the pure water flux of a PVDF membrane used for sludge concentration is 2120.02L / (m 2 h), when filtering activated sludge, the membrane flux is 161.73L / (m 2 h).

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Abstract

The invention discloses a preparation method of a flat membrane for sludge concentration, and belongs to the fields of sludge concentration flat membranes. The method comprises the following steps: sequentially adding a solvent, a pore-foaming agent, a surface active agent and polyvinylidene fluoride (PVDF) into a wild-mouth bottle according to certain ratio, and meanwhile performing stirring, soas to uniformly mix the materials, then putting the wild-mouth bottle into a 50 to 80 DEG drying oven, and timely stirring every day, so as to obtain a uniformly mixed casting solution, uniformly coating the casting solution onto a non-woven fabric base material through a flat film blade, soaking non-woven fabric into a coagulating bath, so as to perform phase transformation, soaking a flat membrane into glycerinum, then treating the flat membrane, and performing normal temperature drying treatment, so as to obtain a PVDF membrane used for sludge concentration treatment. The PVDF membrane hasthe characteristics of high flux, high strength and low pollution rate, can ensure that water yielding is stable when being applied to a flat membrane sludge concentration reactor, and properly meetsthe requirement on sludge concentration.

Description

technical field [0001] The invention relates to the technical field of sludge concentration and flat membrane preparation, in particular to a method for preparing a PVDF flat membrane used for sludge concentration. Background technique [0002] At this stage, the ecological environment has been widely valued, the requirements for water treatment have become more stringent, the scale and speed of construction of urban sewage treatment facilities have been accelerating, and the amount of sludge, as a by-product of biological treatment, has continued to increase; however, due to the treatment of sludge Imperfect policies and systems are often not properly disposed of in my country's existing sewage treatment plants. Therefore, the treatment and disposal of sludge has become an important problem that needs to be solved urgently. [0003] The purpose of sludge thickening is to increase sludge concentration and reduce sludge volume, thereby reducing the pressure on subsequent slud...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D71/34C02F11/121B01D69/06
CPCB01D67/0011B01D71/34C02F11/121
Inventor 王巧英李艳丽郭雨菲顾景景蒋玲燕裘湛郭繁锦孙继成王志伟吴志超
Owner SHANGHAI ZIZHENG ENVIRONMENT PROTECTION TECH
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