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Ultrafiltration membrane for sewage treatment process and preparation method thereof

A technology of ultrafiltration membrane and mechanism, applied in the field of ultrafiltration membrane, can solve the problems of pollutant adsorption, membrane fouling, limited application, etc., and achieve the effect of high membrane flux, good retention rate and good mechanical strength

Active Publication Date: 2021-06-15
HANGZHOU NAXI ECOLOGICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the hydrophobicity of PVDF membrane, it is easy to generate pollutant adsorption and cause membrane fouling when it is applied to the separation process of oily pollutants, which limits its application in the field of sewage separation.

Method used

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  • Ultrafiltration membrane for sewage treatment process and preparation method thereof
  • Ultrafiltration membrane for sewage treatment process and preparation method thereof
  • Ultrafiltration membrane for sewage treatment process and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of preparation method of ultrafiltration membrane,

[0040] Add the inorganic membrane material into the solvent, after ultrasonic dispersion, add the basement membrane material, stir and mix, add the functional membrane material, stir for 12 hours to form a homogeneous casting solution, let it stand for 12 hours for degassing, and use a scraper to scrape the solution Then immerse the glass plate in deionized water at 20°C to complete the phase exchange, then take out the membrane and soak it in deionized water for 36 hours to remove the residual solvent; the inorganic membrane material is titanium dioxide nanoparticles with a particle size of 20nm, without The addition amount of mechanism membrane material is 0.8wt% of solvent; Solvent is the DMF of 80wt%; Basement membrane material is polyvinylidene fluoride, the addition amount of basement membrane material is 21wt% of solvent, and the temperature when adding basement membrane material is 60 ℃; the functional ...

Embodiment 2

[0042] Compared with Embodiment 1, this embodiment differs only in that the inorganic membrane material is aluminum oxide nanoparticles.

Embodiment 3

[0044] Compared with Example 1, this example differs only in that the inorganic membrane material is silica nanoparticles

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Abstract

The invention discloses an ultrafiltration membrane for a sewage treatment process and a preparation method of the ultrafiltration membrane, and belongs to the technical field of ultrafiltration membranes. The ultrafiltration membrane comprises an inorganic membrane making material,a functional membrane-making material and a base membrane; the inorganic membrane making material comprises inorganic nanoparticles, and the particle size of the inorganic nanoparticles is 10-30 nm; The functional membrane-making material comprises graphene oxide; the base membrane is made of PVDF; and the inorganic membrane-making material and the functional membrane-making material are distributed in the base membrane material. The obtained ultrafiltration membrane is high in membrane flux, and the membrane flux of the ultrafiltration membrane is 400 L / (m <2>.H) or above; the rejection rate is good, and the rejection rate of the ultrafiltration membrane is 89% or above; the anti-pollution capacity is good, and the anti-pollution capacity of the ultrafiltration membrane is 60% or above; and the mechanical strength is good, the tensile strength of the ultrafiltration membrane is 15 N or above, and the elongation at break of the ultrafiltration membrane is 4.5% or above.

Description

technical field [0001] The invention belongs to the technical field of ultrafiltration membranes, and in particular relates to an ultrafiltration membrane used in a sewage treatment process and a preparation method thereof. Background technique [0002] Ultrafiltration membrane is a microporous separation membrane with a pore size in the range of 0.01-0.1 μm, and its pore size is usually characterized by molecular weight cut off. Ultrafiltration membranes have been used to remove bacteria, emulsified oil, metal oxides, colloids, proteins and other substances with large molecular weights in water or other solutions. [0003] Polyvinylidene fluoride has excellent weather resistance and chemical stability. Its performance is basically unchanged after being irradiated with ultraviolet rays with a wavelength of 200-400nm for one year; it is not corroded by strong oxidants such as acids and alkalis and halogens at room temperature. It is very stable to organic solvents such as al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D67/00C02F1/44
CPCB01D69/02B01D67/0079C02F1/444B01D2323/02B01D2325/36
Inventor 徐坚麟付源王振娥
Owner HANGZHOU NAXI ECOLOGICAL TECH CO LTD