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Method for cleaning filtration membrane

A washing method and membrane filtration technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as air bubbles in the filtration membrane, washing liquid cannot reach the end of the filtration membrane, etc.

Active Publication Date: 2016-04-20
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the method of washing the filter membrane by injecting the cleaning solution into the filter membrane, there may be the following problem: when the raw water contains components that react with the components in the cleaning solution to generate bubbles, bubbles are generated in the filter membrane, and the injection The wash solution does not reach the end of the filter membrane

Method used

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  • Method for cleaning filtration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] A hollow fiber membrane element (STERAPORESADF manufactured by Mitsubishi Rayon Co., Ltd.) was fixed to a structure (hereinafter referred to as a module) having an air diffuser and a water collection part for membrane filtration, and the module was immersed in a tank containing activated sludge to be treated from factory drainage. in the sink. Connect the air diffuser and blower, membrane element and suction pump, start the blower, and start the suction pump while the air is diffused, and perform the purification test of factory wastewater. As factory effluent, ammoniacal nitrogen (NH 4 -N) is 2100~3000mg / L, COD Mn 3500~4700mg / L, COD Cr The effluent from the coking process of 3000-5000mg / L, TOC 1000-2000mg / L, chroma 400-800, and n-hexane extract 10-15mg / L is used as raw water.

[0103] What diluted the said raw water with seawater about 3 times was used as the water to be treated in this Example. The raw water contains Ca 2+ 70~200mg / L, NH 4 -N is 800~1200mg / L, CO...

Embodiment 2～5

[0109] Except that the permeation flux was changed to 0.3 to 2.0 m / d, the hollow fiber membrane was washed in the same manner as in Example 1, and the water permeability retention rate was obtained. Table 1 shows the results of the water permeability retention rate.

Embodiment 6～10

[0111] Use sodium hydroxide solution to adjust the pH of the water to be treated to 11, and use air to bubble to make the NH in the above raw water 4 - After N was 60 mg / L, the hollow fiber membrane was washed in the same manner as in Example 1 except for using an activated sludge solution containing raw water whose pH was adjusted to 7 to 8 with a chloric acid solution, and the water permeability retention rate was obtained.

[0112] Table 1 shows the results of the water permeability retention rate.

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Abstract

A method for cleaning a filtration membrane comprises reverse flowing of a cleaning agent from the processed water side to the raw water side of the filtration membrane, said cleaning agent containing chloric acid, a salt thereof or the like and a surfactant. In this method for cleaning a filtration membrane, the permeation flux of the cleaning agent during the reverse flowing is 0.15-3.0 m / d.

Description

technical field [0001] The present invention relates to a method of washing filter membranes used in sewer drainage, factory wastewater treatment, and the like. [0002] This application claims the priority of Japanese Patent Application No. 2013-137501 for which it applied in Japan on June 28, 2013, and uses the whole content here. Background technique [0003] Generally, when water is treated using a membrane filtration module, filtration is performed while repeating a filtration step and a washing step. In the filtration process, when wastewater is treated using a filter membrane, dirty components such as suspended matter contained in the wastewater can be removed to obtain clarified treated water. [0004] However, when the wastewater is filtered with a filter membrane, dirty components adhere to the pores of the filter membrane or on the surface of the filter membrane, causing the filter membrane to be blocked, and the filtration resistance (resistance to filtration) i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06
CPCB01D65/02B01D2321/04B01D2321/162B01D2321/168
Inventor 酢谷京平安保贵永
Owner MITSUBISHI CHEM CORP