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Method for washing hydrophobic membrane for treating industrial wastewater

A technology of industrial wastewater and hydrophobic membrane, applied in osmosis/dialysis water/sewage treatment, chemical instruments and methods, membrane technology, etc., can solve the problems of unsatisfactory mass transfer rate recovery effect, etc., to achieve reuse and restore hydrophobicity , Improve the effect of membrane hole blocking

Active Publication Date: 2013-07-03
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is only seen that Han etc. recommend using 2% HCl solution to soak and clean the membrane assembly for 20min, but the recovery effect of the mass transfer rate of the membrane is not ideal (Han, B.B., Shen, Z.S., Wickramasinghe, S.R. (2005) Fouling nad cleaning of gas-filled membranes for cyanide removal, Separation and Purification Technology, 40(6): 1169-1189)

Method used

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  • Method for washing hydrophobic membrane for treating industrial wastewater
  • Method for washing hydrophobic membrane for treating industrial wastewater
  • Method for washing hydrophobic membrane for treating industrial wastewater

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Experimental program
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specific Embodiment approach

[0024] Use NaOH solution, HCl solution, EDTA solution and air to clean the membrane in the membrane module in sequence. Circulation and membrane suction are carried out in four ways, among which,

[0025] Soaking and cleaning: put the inner and outer surfaces of the membrane in the membrane module in full contact with the cleaning solution and let it stand for more than 1 hour; tube-side circulation: make the cleaning solution form a tangential flow on the inner surface of the membrane wire (or the surface of one side of the membrane), which can be realized by a circulating pump The tube-side circulation flow inside the membrane filament is realized, and the cleaning time is more than 20 minutes; the shell-side circulation: the cleaning solution forms a tangential flow on the outer surface of the membrane filament (or the surface of the other side of the membrane), and a circulation pump can be used to realize the external cleaning of the membrane filament. The shell-side circ...

Embodiment 1

[0028] figure 1Represent the liquid / liquid membrane (hollow fiber) absorption system that is used to reclaim the cyanide in the acrylonitrile production waste water of embodiment one, this device system is mainly by microfiltration device 1, waste water circulation pool 2, membrane module 3, absorption liquid circulation Pool 4, waste water (pipe side) circulation pump 5, absorption liquid (shell side) circulation pump 6 and other components. The cyanide in the acrylonitrile wastewater is acidified to produce hydrocyanic acid (circulation in the tube side) which is absorbed by the alkaline absorption solution in the membrane module (circulation in the shell side). The mass transfer coefficient k of cyanide from the tube side to the shell side continues to decrease with the membrane absorption process, which indicates the occurrence of membrane fouling (such as Figure 4 ). When k continues to decrease and the cyanide concentration in the acrylonitrile wastewater remains subs...

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Abstract

The invention discloses a method for washing a hydrophobic membrane for treating industrial wastewater, which belongs to the technical field of the method for washing the hydrophobic membrane for treating the industrial wastewater. The method comprises the following steps of: washing a membrane in a membrane assembly by using solution of NaOH, solution of HCl, solution of EDTA and air in turn; and then drying the hydrophobic membrane, wherein when the solution of NaOH, the solution of HCl and the solution of EDTA are used for washing the membrane, each cleaning solution are used in four modesof soaking, tube stroke cycling, shell stroke cycling and membrane-passing sucking. The method for washing the hydrophobic membrane for treating the industrial wastewater can effectively remove a contaminated layer of a contaminated membrane surface, so the mass transfer efficiency of the membrane can be greatly improved, and the membrane separation efficiency is effectively restored; and the membrane assembly is reused in the technology of the industrial wastewater treatment by a membrane method.

Description

technical field [0001] The invention belongs to the technical field of cleaning methods for hydrophobic membranes used for industrial wastewater treatment, in particular to a cleaning method for hydrophobic membranes used for industrial wastewater treatment. Background technique [0002] Membrane distillation technology, degassing membrane technology and membrane absorption technology are new methods of effective industrial wastewater treatment that have been developed and widely concerned in recent years. They all use hydrophobic porous membranes as media to separate wastewater from volatile components. So as to achieve the purpose of removing pollutants in wastewater. Compared with other industrial wastewater treatment processes, they have the advantages of high separation efficiency, wide application range, mild operating conditions, no secondary pollution, easy operation, etc., and have significant social and economic benefits. However, during the operation of these mem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/02C02F1/44
Inventor 吴金玲王建龙何仕均
Owner TSINGHUA UNIV
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