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A method to improve the efficiency of membrane separation process

A technology of membrane separation and high efficiency, applied in the field of membrane separation, can solve the problems of complicated operation control technology, membrane damage, shortened membrane service life, etc., and achieve the effects of low energy consumption, convenient operation, and reduced use of cleaning agents

Active Publication Date: 2015-08-19
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Backwash technology has been widely used in the membrane separation process. It applies a reverse force to the membrane tube by using gas, liquid, etc. as the backwash medium, so that some of the pollutants adsorbed on the surface of the membrane and in the pores of the membrane are separated from the separation membrane. A method to restore the flux, but its operation and control technology is complicated, and other backwashing media are introduced, and at the same time, it has potential damage to the membrane and shortens the service life of the membrane

Method used

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Examples

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Embodiment 1

[0021] Embodiment 1: see figure 1 , a method for increasing the separation efficiency of membrane processes. With vinegar agaricus fermented liquid as raw material liquid, carry out ultrafiltration clarification with the above-mentioned method, step is as follows:

[0022] (1) Open valves 2, 4, 8, 10 and 11.

[0023] (2) Open the feed pump 3, the vinegar fermented liquid in the material storage tank is pumped into the wide flow channel roll-type polyamide ultrafiltration assembly 6 with a molecular weight cut-off of 50,000 Daltons, and the valve 8 is adjusted to make the ultrafiltration membrane The transmembrane pressure is 0.2MPa.

[0024] (3) Every 0.5 hours, open valves 5 and 7, close valves 4 and 8, change the direction of feed liquid flowing through the membrane module, that is, enter the reverse flow mode.

[0025] (4) At the same time, in the process of membrane filtration, every 10 minutes, make valves 8 or 7 (in reverse flow mode) and 9 fully open, and close valve...

Embodiment 2

[0027] Embodiment 2: adopt the device identical with embodiment 1, be raw material liquid with the fermented liquid of agaricus auriculae, carry out ultrafiltration clarification with the above-mentioned method, step is as follows:

[0028] (1) Open valves 2, 4, 8, 10 and 11.

[0029] (2) Open the feed pump 3, the vinegar fermented liquid in the storage tank is pumped into the hollow fiber polyamide ultrafiltration module 6 with a molecular weight cut-off of 50,000 Daltons, and the valve 8 is adjusted to make the transmembrane pressure of the ultrafiltration membrane is 0.3MPa.

[0030] (3) Open valves 5 and 7, close valves 4 and 8 every hour, and change the direction of the feed liquid flowing through the membrane module, that is, enter the reverse flow mode.

[0031] (4) At the same time, in the process of membrane filtration, every 30 minutes, make valves 8 or 7 (in reverse flow mode) and 9 fully open, and close valves 10 and 11 at the same time, so that the large flow of ...

Embodiment 3

[0033] Embodiment 3: adopt the device identical with embodiment 1, take whey as raw material liquid, carry out nanofiltration concentration with above-mentioned method, steps are as follows:

[0034] (1) Open valves 2, 4, 8, 10 and 11.

[0035] (2) Open the feed pump 3, the whey in the storage tank is pumped into the roll-type polyacrylamide nanofiltration assembly 6 with a molecular weight cut-off of 300 Daltons, and the valve 8 is adjusted so that the transmembrane pressure of the ultrafiltration membrane is 1.5MPa.

[0036] (3) Every 4 hours, open valves 5 and 7, close valves 4 and 8, change the direction of feed liquid flowing through the membrane module, that is, enter the reverse flow mode.

[0037] (4) At the same time, in the process of membrane filtration, every 60 minutes, make valves 8 or 7 (in reverse flow mode) and 9 fully open, and close valves 10 and 11 at the same time, so that the large flow of feed liquid washes the surface of the membrane, After maintainin...

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Abstract

The invention relates to a method for improving the membrane separation process efficiency. The method is characterized in that on the foundation of conventional cross flow membrane separation equipment and operation processes, an appropriate pipeline and an appropriate valve are designed, a period type reversing-pulse washing method is adopted to lighten the membrane pollution, and an inlet and an outlet of membrane module raw material liquid are periodically alternately changed at a certain time interval in the membrane filtering process, so that the flowing direction of a feed liquid in a membrane surface is alternately changed; meanwhile, a permeance solution side valve is periodically switched off, the circulating rate of the feed liquid is increased, the feed liquid washes the membrane surface in a high flow rate manner, and the similar backwashing effect is obtained. The method provided by the invention has the advantages that the pollution level of the surface of a membrane is effectively lightened, the penetration flux is increased, the filtering efficiency of the membrane separation equipment is obviously improved, the method is simple and liable, and the method is suitable for popularization and application in industrialized production.

Description

field of invention [0001] The invention belongs to the field of membrane separation and relates to a method for improving the efficiency of the membrane separation process. Background technique [0002] In the traditional membrane separation process, the feed liquid enters from the feed port of the membrane module and exits from the discharge port. In the long-term membrane filtration process, membrane fouling caused by concentration polarization, membrane surface adsorption, particle deposition, and electrostatic effect between solute and membrane surface is inevitable. The impact of membrane fouling on the membrane separation process can cause attenuation of membrane flux and low membrane separation efficiency, or irreversible damage to membrane performance, shorten the service life of the membrane, and increase the operation and maintenance costs of the membrane. Therefore, how to reduce and control the fouling in the membrane separation process is the key to the success...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/04B01D65/08
Inventor 万印华齐本坤陈向荣杭晓风
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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