Anti-pollution flat sheet membrane

A flat membrane, anti-pollution technology, applied in membrane technology, semi-permeable membrane separation, general water supply saving, etc., can solve problems such as limited effect, increased energy consumption, and reduced water production

Pending Publication Date: 2020-10-23
BEIJING ORIGIN WATER FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual application process, the quality of the influent water is not easy to change, and the method of improving the pollution cycle by changing the operating conditions is usually limited in effect, and may also lead to disadvantages such as reduced water production and increased energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] see Figures 1 to 5 , the present invention provides an anti-pollution flat membrane, comprising a plate-shaped membrane body 1;

[0036] The film body 1 has a plurality of recessed parts 2 with regular-shaped structural features, and the structure of the recessed part 2 includes any one or more of the following features: a strip-shaped groove structure; a dot-shaped recessed structure; a polygonal recessed structure; Among them, such as Figure 5 As shown, the extension direction of the cross section of the concave part 2 of the strip groove structure has an included angle θ with the water flow direction on the surface of the membrane body 1;

[0037] The area where the water flows along the surface of the membrane body 1 to the recessed part 2 is guided by the recessed part 2 to form a vortex.

[0038] The anti-pollution flat film provided by the present invention is subjected to physical or chemical treatment during the film-making process, so that the surface form...

Embodiment 2

[0048] In this example, the reverse osmosis membrane RO-1 with regular grooves on the surface and the reverse osmosis membrane RO-2 with irregular surface morphology were used to conduct a comparative experiment on the anti-fouling performance. The flux and salt rejection performance of the two membranes are the same, both are 38.7LMH, 96.8% (test conditions: 250ppm sodium chloride solution, 60psi). The groove width of the RO-1 diaphragm surface regular shape is 0.38mm, the groove depth h is 0.08mm, and the groove interval b is 0.4mm.

[0049] The anti-scaling test solution uses 787.67mg / L NaHCO 3 and 607.725mg / L CaCl 2 For the mixed solution, the operating condition is cross-flow filtration, the constant flux is 15LMH, and the membrane surface flow velocity is 0.027m / s. The direction of the regular groove of the RO-1 membrane and the cross-flow direction of the test solution are 90°. Inlet pressure changes as Figure 6 As shown, after 102 hours of operation, the inlet pres...

Embodiment 3

[0051] In this example, the nanofiltration membrane NF-1 with regular diamond-shaped depressions on the surface and the nanofiltration membrane NF-2 with irregular surface morphology were used to conduct a comparative experiment of anti-pollution performance. The flux and salt rejection performance of the two membranes are the same, both are 60.5LMH, 98.6% (test conditions: 2000ppm magnesium sulfate solution, 70psi). The surface of the NF-1 diaphragm has a regular shape with a diamond-shaped depression with a side length of 0.45mm, an acute angle of 60°, a depression depth h of 0.05mm, and an interval b of 0.1mm.

[0052] The anti-pollution test solution uses a mixed solution of 16mg / L fulvic acid, 416.3mg / L calcium chloride, 0.198mg / L aluminum chloride and 320mg / L sodium sulfate, and adjusts the pH to 7.8~8, so that there are organic and Inorganic composite pollution. The operating conditions are cross-flow filtration, constant flux 30LMH, and membrane surface flow velocity ...

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Abstract

According to an anti-pollution flat sheet membrane provided by the invention, physical or chemical treatment is carried out in the membrane preparation process, so that on the surface of the anti-pollution flat sheet membrane, concave parts with a regular shape, a certain size and a certain direction is formed. The structure of the concave parts comprises any one or more of the following characteristics: a strip-shaped groove structure; a dot-shaped concave structure; and a polygonal concave structure; an included angle is formed between the extending direction of the cross section of the concave parts and the water flow direction on the surface of the membrane body. The flat sheet membrane with the regular concave part is prepared; the concave parts can enable inflow water to form a micro-vortex effect, effectively slow down membrane pollution and shorten the cleaning period, so that the service life of the membrane is prolonged, the desalination performance of the flat sheet membranecan be kept unchanged, the membrane pollution can be effectively slowed down, the cleaning period is shortened, the service life of the membrane is prolonged, the adjustable space is large, and the anti-pollution effect is obvious.

Description

technical field [0001] The invention relates to the technical field of membranes, in particular to an anti-pollution flat membrane. Background technique [0002] With the rapid development of membrane technology, a series of flat membranes, such as nanofiltration membranes, reverse osmosis membranes, ultrafiltration membranes and microfiltration membranes, have been widely used in the fields of municipal sewage and industrial wastewater. However, there is a problem of membrane fouling in the actual application process, which will not only affect the efficiency of the membrane, but frequent cleaning will also adversely affect the life of the membrane, resulting in increased application costs. Membrane fouling is mainly divided into organic pollution, inorganic pollution and microbial pollution. Factors affecting membrane fouling mainly include the following three aspects: First, the quality of influent water, such as the particle size of pollutants, pH value of influent water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D63/08
CPCB01D61/025B01D61/027B01D63/08Y02A20/131
Inventor 王帅夏建中王丽况武王中阳
Owner BEIJING ORIGIN WATER FILM TECH
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