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Cleaning method of porous separation membrane

A porous separation membrane and membrane separation technology, applied in the field of membrane separation, can solve problems such as membrane fouling and membrane separation process cannot run stably for a long time, and achieve the goal of preventing clogging, prolonging the stable operation period, and improving process economy and reliability Effect

Inactive Publication Date: 2009-09-09
DALIAN UNIV OF TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is membrane fouling, especially the problem that the membrane separation process cannot run stably for a long time due to blockage at the bottom of the module. The present invention provides a cleaning method for porous separation membranes to prevent membrane flow channels and flow channels Inlet blockage to achieve long-term stable operation of the membrane separation process

Method used

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  • Cleaning method of porous separation membrane
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  • Cleaning method of porous separation membrane

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Embodiment 1

[0022] in such as figure 1 In the described membrane separation process for treating suspension liquid with high solid content, the cleaning unit at the bottom of the membrane module combined with the enhanced chemical backwashing process is applied, and the starting pressure of the cleaning unit at the bottom of the membrane module is set to 0.145Mpa. During the operation of the membrane separation system, the pressure at the bottom of the membrane module rises with time. When the start-up pressure is reached, the bottom cleaning program of the membrane module is started, that is, the bottom cleaning of the membrane module is realized in the backwashing step of the enhanced chemical backwashing process. Valve 16, open valve 14, open valve 12, start the backwash pump 13, the cleaning program at the bottom of the membrane module starts counting, after counting, open valve 16, close valve 12, and continue backwashing until the end of backwashing. figure 2 The change of the pre...

Embodiment 2

[0024] image 3 Applications of the invention to airlift membrane modules and bioreactor systems are described. Different from the membrane separation process of the aforementioned solid content suspended liquid, a bubbling system consisting of a blower 21, a valve 22 and a gas distributor 23 is installed at the bottom of the source water pool, in order to provide appropriate flow rate for the bacterial population in the bioreactor. Oxygen; an air blowing system consisting of a blower 24 and a valve 25 is installed at the bottom of the membrane module, the main purpose is to provide air buoyancy and reduce the accumulation of activated sludge on the membrane surface. Set the starting pressure of the cleaning unit at the bottom of the membrane module to 0.155Mpa, Figure 4 It is an application example of membrane module bottom cleaning unit in airlift membrane module and bioreactor system. The pressure at the bottom of the membrane module gradually increases with time, and th...

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Abstract

The invention relates to a cleaning method of a porous separation membrane, belonging to the technical field of membrane separation. The cleaning method of the porous separation membrane is characterized in that a membrane module bottom cleaning unit is applied in the membrane separation process of treating materials with high solid content, i.e., a start parameter is activated, a circulating pump (4) and valves (5), (9) and (14) are closed, and valves (8) and (12) are opened; liquid in a membrane module flows out of the membrane module under the action of the weight and flushes contaminants deposited at the bottom of the membrane module out of the membrane module; the start parameter can be one of a filter counter, a filter time interval, start pressure and a trans-membrane pressure difference or all or part of the same; and the membrane module bottom cleaning unit singly runs or is integrated to the backflushing process to enhance the cleaning effect. The invention has the advantages that the cleaning method effectively prevents a membrane flow passage and a flow passage entry from being blocked, prolongs the stable operation period of the membrane separation process and is widely suitable for a membrane biological reactor, and the like in the membrane separation process of treating the materials with high solid content.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a cleaning method of a porous separation membrane, in particular to a cleaning method of a porous separation membrane for processing materials with high solid content. Background technique [0002] Membrane separation technology is a high-tech, widely used in water treatment, waste water recycling, separation and purification of biochemical products, etc. For the membrane separation process of liquid with high solid content floating matter, such as membrane bioreactor, advanced treatment of municipal sewage, and other water treatment processes with high content of suspended matter impurities, the existence of high concentration of suspended matter makes the membrane in the process of use It is easy to form membrane fouling due to the accumulation of suspended solids in the medium, causing the permeation flux of the membrane to decay rapidly with time, and the reliabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02
Inventor 李战胜李雪梅李杨郭春刚张春庆王玉荣
Owner DALIAN UNIV OF TECH
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