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Manufacturing method and application of electronegative composite microfiltration membrane

A manufacturing method and negatively charged technology, applied in chemical instruments and methods, ultrafiltration, membrane technology, etc., can solve the problems of small flux, small pore size, and inability to use membrane bioreactors, etc., and achieve narrow pore size distribution and porosity Moderate, strong anti-pollution effect

Inactive Publication Date: 2013-09-04
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small pore size, the charged nanofiltration membrane and charged ultrafiltration membrane need to operate under a relatively high pressure (generally above 200KPa), and the operating flux is small, so they cannot be used in membrane bioreactors.

Method used

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  • Manufacturing method and application of electronegative composite microfiltration membrane
  • Manufacturing method and application of electronegative composite microfiltration membrane
  • Manufacturing method and application of electronegative composite microfiltration membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A kind of manufacturing method of negatively charged microfiltration composite membrane provided by the present embodiment is carried out according to the following steps:

[0029] (1) Dissolve 12g of polyethersulfone in 73g of N,N-dimethylformamide organic solvent at 50°C, add 15g of polyvinylpyrrolidone organic additive, fully stir to dissolve, filter the insoluble matter and stand for defoaming to obtain Casting solution.

[0030] (2) Cast the casting solution onto the polyester non-woven fabric, control the gap between the scraper and the polyester non-woven fabric to be 100-200 μm, scrape the film with a scraper, let it stand in the air for 10-60 seconds, and then Under the temperature condition of 20-80°C, immerse in an organic solvent coagulation bath accounting for 0-1% of the total mass to form a film, then immerse the film in sodium polyacrylate solution for 30-60 minutes, take it out and dry it. The gap between the scraper and the polyester non-woven fabric ...

Embodiment 2

[0038] A kind of manufacturing method of negatively charged microfiltration composite membrane provided by the present embodiment is carried out according to the following steps:

[0039] (1) Dissolve 9g of polyethersulfone in 75g of N,N-dimethylformamide organic solvent at 50°C, add 16g of polyvinylpyrrolidone organic additive and 2g of polystyrene sodium sulfonate PSS solution, fully stir to dissolve, and filter The insoluble matter is left to stand for defoaming to obtain the casting solution.

[0040] (2) Cast the casting solution onto the polyester non-woven fabric, control the gap between the scraper and the polyester non-woven fabric to be 100-200 μm, scrape the film with a scraper, let it stand in the air for 10-60 seconds, and then Under the temperature condition of 20-80°C, immerse in an organic solvent coagulation bath accounting for 0.5% of the total mass to form a film, then immerse the film in polystyrene sodium sulfonate PSS solution for 30-60 minutes, take it o...

Embodiment 3

[0044] A kind of manufacturing method of negatively charged microfiltration composite membrane provided by the present embodiment is carried out according to the following steps:

[0045] (1) Dissolve 8g of polyethersulfone in 60g of N,N-dimethylformamide organic solvent at 50°C, add 18g of polyvinylpyrrolidone organic additive and 14g of sodium carboxymethyl cellulose solution, stir well to dissolve, filter insoluble The material was left to stand for defoaming to obtain the casting solution.

[0046] (2) Cast the casting solution onto the polyester non-woven fabric, control the gap between the scraper and the polyester non-woven fabric to be 180 μm, scrape the film with a scraper, and let it stand in the air for 60 seconds, then at a temperature of 25°C Under certain conditions, immerse in an organic solvent dimethylformamide coagulation bath accounting for 0.2% of the total mass to form a film, then soak the film in sodium carboxymethylcellulose solution for 60 minutes, tak...

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Abstract

The invention discloses a manufacturing method of an electronegative composite microfiltration membrane, which comprises the following steps of: (1) dissolving polyether sulfone in an organic solvent, adding an additive and an electronegative reagent, stirring and dissolving sufficiently, filtering an undissolved substance, standing, obtaining membrane casting liquid, (2) casting the memebrane casting liquid onto polyester non-woven cloth, scraping a membrane with a scraper, immersing in a coagulating bath for membrane forming, obtaining a polyether sulfone microfiltration membrane, immersing the polyether sulfone microfiltration membrane in an electronegative reagent solution, taking out for drying, and (3) crosslinking the membrane subjected to electronegative treatment in a crosslinking agent solution, washing to be neutral with deionized water, and obtaining the electronegative composite microfiltration membrane. In addition, the invention provides an application of the electronegative composite microfiltration membrane in a membrane bioreactor. Since bacteria and the surfaces of colloids in the membrane bioreactor are electronegative, the prepared membrane is electronegative, has good hydrophilicity, is not easy to pollute, is not required to be cleaned frequently, has high water flux of stable operation, and lowers the sewage treatment cost.

Description

technical field [0001] The invention relates to a method for manufacturing a microfiltration composite membrane, more specifically, a method for manufacturing a negatively charged microfiltration composite membrane. Background technique [0002] Membrane bioreactor is an efficient biological treatment technology integrating biological treatment and membrane separation. It has the following characteristics: (1) compact structure and small footprint; (2) high treatment efficiency and good effluent quality, fundamentally solving the Sludge bulking problem; (3) high volume load, strong impact load resistance; (4) less excess sludge production, reducing the workload and cost of sludge treatment; (5) high degree of equipment automation. Membrane bioreactors have been successfully applied to large, medium and small sewage treatment systems, but membrane fouling limits the popularization and application of membrane bioreactor technology. Membrane fouling leads to a rapid decline in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/68B01D69/12B01D67/00B01D61/18C02F3/00
Inventor 王勇华耀祖姜瑜
Owner NANJING UNIV
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