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Membrane pollution control method

A control method and membrane fouling technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as irreversible pollution of ultrafiltration membranes, achieve the effect of saving operating costs and prolonging service life

Inactive Publication Date: 2011-07-20
DALIAN EUROFILM IND
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Problems solved by technology

[0005] In view of the above-mentioned problems existing in the prior art, the present invention aims to provide a membrane fouling control method that can effectively control membrane fouling and restore membrane flux, in order to solve the problem of membrane pollution in the process of treating oily and cationic surfactant sewage. Irreversible fouling of ultrafiltration membranes by cationic surfactants

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Embodiment Construction

[0019] Now adopt the raw water that adds DX-1245 type corrosion-inhibiting bactericide to carry out the anti-pollution experiment to further specify the implementation effect of the membrane pollution control method provided by the present invention:

[0020] A. The ultrafiltration membrane adopts the hollow fiber membrane made of hydrophilic sulfonated polyethersulfone from Germany MEMBRANA company, the inner and outer diameter of the membrane wire is 0.7 / 1.0mm, the cut molecular weight is 80000Da, and the membrane area of ​​the module is 0.013m 2 ;

[0021] B. Cationic surfactant adopts DX-1245 corrosion inhibitor and fungicide, and the concentration in raw water is 500ppm;

[0022] C. The nonionic surfactant adopts Triton p-octylphenol polyoxyethylene nonionic surfactant, and the dosage concentration is 149ppm;

[0023] D. The feed pressure of the experiment is 1 atm, the average temperature is 27.5°C, and reverse osmosis water is used for backwashing.

[0024] Such as ...

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Abstract

The invention relates to a membrane pollution control method which comprises the following concrete steps of: (1) pretreating the surface of a new membrane by adopting non-ionic surfactants, and then, back washing and soaking with reverse osmosis water; (2) treating the sewage of oily and cationic surfactants by using the treated membrane, wherein non-ionic surfactants are added together in the using process; and (3) after the membrane is polluted, flushing with reverse osmosis water to recover the flux. The method can effectively control the irreversible pollution on an ultrafiltration membrane caused by cationic surfactants in the oily sewage; and after the ultrafiltration membrane is back washed simply, the membrane flux can be recovered or is even slightly higher than the initial flux, thereby prolonging the service life of the ultrafiltration membrane and saving the operating cost.

Description

technical field [0001] The invention relates to a method for controlling membrane pollution, in particular to a method for controlling membrane pollution in a membrane process for treating sewage containing oil and cationic surfactants. Background technique [0002] Oily sewage is a kind of industrial sewage with a large volume and wide range and serious hazards. The commonly used treatment methods include chemical demulsification, gravity separation, centrifugation, coalescence, heat treatment, electrocoagulation and membrane separation. A stream of slick oil can be removed by traditional mechanical gravity separation equipment, unstable oil-water emulsion can be separated by filtration after mechanical or chemical demulsification, and for sewage containing stable emulsified oil, especially dissolved oil, More complex and advanced treatment methods are required to meet emission standards. [0003] In recent years, with the continuous improvement of laws and regulations on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/08B01D65/02
Inventor 王连军杨晓王颖李恕广杜国栋栗广勇
Owner DALIAN EUROFILM IND