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Preparation method of flat membrane for sewage treatment

A technology of sewage treatment and flat membrane, which is applied in adsorption water/sewage treatment, water/sludge/sewage treatment, osmosis/dialysis water/sewage treatment, etc., to achieve stable membrane physical properties, easy industrialization and less dosage. Effect

Inactive Publication Date: 2014-09-10
吴智立
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the shortcomings of the existing PVDF separation membrane in the adsorption of heavy metal ions, the technical problem to be solved by the present invention is to provide a flat membrane preparation method for sewage treatment; it has adsorption function for heavy metal ions such as lead, septum, nickel, molybdenum, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of casting solution. Weigh PVDF and add it to a beaker filled with 500 mL of DMF, and the mass percentage of PVDF in DMF is 18%. A porogen PEG with a molecular weight of 10000 was added, and the amount of PEG added was 8% by mass in DMF. The beaker was placed in a water bath at 60°C, and the solid was dissolved under electromagnetic stirring to obtain a casting film feed solution. The modified attapulgite is added to the feed liquid, so that the mass ratio of PVDF and attapulgite is 1:0.01, and it is fully stirred and ultrasonically oscillated to disperse uniformly to obtain a casting solution.

[0024] (2) Preparation of PVDF-attapulgite hybrid flat film. Pour the casting solution on a glass plate, scrape it with a glass rod to form a film, immerse it in a coagulation bath constant temperature water tank at 25°C to solidify and form it, and after the film falls off the glass plate, place it in distilled water for 24 hours and wash it with distilled wa...

Embodiment 2

[0027] Embodiment 2: basically the same as Example 1

[0028] (1) Preparation of casting solution. Weigh PVDF and add it to a beaker filled with 500 mL of DMF, and the mass percentage of PVDF in DMF is 16%. A porogen PEG with a molecular weight of 10000 was added, and the amount of PEG added was 8% by mass in DMF. The beaker was placed in a water bath at 60°C, and the solid was dissolved under electromagnetic stirring to obtain a casting film feed solution. A certain amount of modified attapulgite is added to the feed liquid, so that the mass ratio of PVDF to attapulgite is 1:0.05, fully stirred and ultrasonically oscillated to disperse uniformly to obtain a casting solution.

[0029] (2) Preparation of PVDF-attapulgite hybrid flat film. Pour the casting solution on a glass plate, scrape it with a glass rod to form a film, immerse it in a coagulation bath constant temperature water tank at 25°C to solidify and form it, and after the film falls off the glass plate, place it ...

Embodiment 3

[0031] (1) Modification of attapulgite. Weigh 20g of attapulgite with a particle size of 500 mesh, wash with 1L of distilled water, precipitate to get its supernatant, then wash repeatedly 4 times, centrifuge at 500rpm for 1min, get its supernatant, centrifuge at 4000rpm, get its precipitate, Vacuum-dried at 90°C for 24 hours, ground and sieved to obtain purified attapulgite.

[0032]Prepare a hydrochloric acid solution with a concentration of 3mol / L, take 10g of purified attapulgite and 200mL of hydrochloric acid solution into a small beaker, stir and mix, transfer the mixture into a round-bottomed flask after 5min, heat to 70°C and stir for 2h, then ultrasonically oscillate for 30min , filtered with suction, washed with distilled water until the pH was about 6, dried in vacuum at 90°C for 24 hours, ground and sieved to obtain modified attapulgite.

[0033] (2) Preparation of casting solution. Weigh PVDF and add it to a beaker filled with 500 mL of DMF, and the mass percent...

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PUM

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Abstract

The invention discloses a preparation method of a flat membrane for sewage treatment; the invention belongs to the technical field of membranes, and especially relates to preparation technology of an organic inorganic hybridized flat membrane. The flat membrane contains modified attapulgite. The invention needs no special equipment for product preparation, is easy to implement industrially, is simple in overall process, and has no big change in membrane cost. The flat separation membrane product has very good effect on separation of heavy metal ions such as lead, chromium, nickel, molybdenum, and the like in waste water of electrolytes, plating solutions, and the like; the hybridized membrane with a mass ratio of PVDF to attapulgite being 1:0.01 has an adsorption rate of nearly 20%. The method of the invention prepares an organic-inorganic hybridized membrane which combines the advantages of PVDF separation membranes with the adsorption performance of attapulgite, has stable physical properties, and increased pure water flux.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a preparation technology of an organic-inorganic hybrid flat membrane. Specifically, it is a flat ultrafiltration separation membrane prepared by compounding polyvinylidene fluoride membrane material and attapulgite with adsorption function for heavy metal ions. Background technique [0002] With the rapid development of the chemical industry and metallurgical industry, the pollution of wastewater containing heavy metal ions such as lead, copper, chromium, mercury, etc. from electrolytes, electroplating solutions, and mining and metal smelting processes is becoming more and more serious. The pollution of heavy metal wastewater has become It has become a serious environmental and social problem, and it is a key problem in economic development, environmental health, and drinking water safety that urgently need to be solved. [0003] In recent years, the adsorption pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/06B01D71/34B01D67/00C02F1/44C02F1/28C02F101/20C01B33/40
Inventor 吴智立
Owner 吴智立
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