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Method for relieving pollution to ultrafiltration membrane under joint action of pre-oxidation and membrane modification

A combined action and ultrafiltration membrane technology, applied in chemical instruments and methods, oxidized water/sewage treatment, membrane technology, etc., can solve problems such as ultrafiltration membrane pollution, achieve less dosage, simple modification method, improved The effect of effluent water quality

Active Publication Date: 2014-12-24
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In order to solve the problem of ultrafiltration membrane pollution, the technical method adopted in the present invention includes: carrying out ozone pretreatment on the membrane water, and using new carbon nanotube fiber material to modify the ultrafiltration membrane

Method used

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  • Method for relieving pollution to ultrafiltration membrane under joint action of pre-oxidation and membrane modification
  • Method for relieving pollution to ultrafiltration membrane under joint action of pre-oxidation and membrane modification
  • Method for relieving pollution to ultrafiltration membrane under joint action of pre-oxidation and membrane modification

Examples

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Embodiment 1

[0034] This example provides a method for reducing membrane fouling and improving effluent quality through combined action of ozone pre-oxidation and new carbon nanotube fiber material modified polysulfone membrane (20KDa). Specific steps are as follows:

[0035] The effluent from the secondary biological treatment of sewage is treated by microfiltration and then used for later use. The pore size of the microfiltration membrane is 0.45 microns;

[0036] The water sample filtered by the microfiltration membrane is subjected to ozone pre-oxidation treatment for later use, and the dosage of ozone is 2mgO 3 / mg DOC.

[0037] The polysulfone membrane (20kDa, the effective filtration area is 13.4cm 2 ) in an ethanol solution with a volume concentration of 30% for 2 hours to remove the membrane surface protective agent, then soak it in ultrapure water for 24 hours, and change the water once in the middle.

[0038] In a constant-pressure dead-end filtration device, the fully soaked...

Embodiment 2

[0051] The polysulfone membrane in embodiment 1 is changed into polyethersulfone membrane (100KDa, effective filtration area is 13.4cm 2 ), other operations are with embodiment 1;

[0052] from Figure 5 and Image 6 It can be seen that the combination of the obtained ozone pre-oxidation and the new carbon nanotube fiber material modified polyethersulfone membrane has basically the same effects on membrane fouling and effluent quality improvement as in Example 1.

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Abstract

The invention provides a method for relieving pollution to an ultrafiltration membrane under the joint action of pre-oxidation and membrane modification. The method belongs to the crossing field of nanometer materials and environment engineering technology. A novel surface modification method for a CNT (carbon nanotube) fiber material is characterized in that a multiwalled carbon nanotube is dispersed in a certain concentration of ethanol solution, a multiwalled carbon nanotube turbid liquid is obtained and is subjected to ultrasonic treatment to be dispersed evenly, a pressure filtration method is utilized to enable the carbon nanotube to be attached to the surface of the ultrafiltration membrane, and a layer of stable CNT fiber material is formed. In the method, macromolecular pollutants causing blockage can be subjected to oxygenolysis through ozone pretreatment, and the novel CNT fiber material on the surface of the membrane adsorbs and intercepts the pollutants causing blockage, so that the oxygenolysis action and the adsorption and interception action are combined to effectively prolong the service cycle of the ultrafiltration membrane besides enhancing the anti-pollution capacity of the ultrafiltration membrane and improving the effluent quality of the effluent quality. The method is simple to carry out and easy to realize.

Description

technical field [0001] The ozone pretreatment combined with novel carbon nanotube fiber material film surface modification technology involved in the present invention belongs to the intersecting field of nanometer material and environmental engineering technology. Background technique [0002] Ultrafiltration has excellent effluent quality, small footprint, high degree of automation, can effectively remove turbidity and pathogens in water, and has broad application prospects in the field of sewage regeneration. However, the membrane fouling in the process of sewage ultrafiltration is very serious, which restricts the development of membrane technology. [0003] Membrane fouling refers to the adsorption and deposition of particles, colloidal particles or solute macromolecules in the treated materials on the surface of the membrane or in the pores of the membrane due to physical and chemical interaction or mechanical interaction with the membrane, causing the membrane pore si...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/78C02F1/44B01D71/68B01D69/06B01D67/00
Inventor 郭瑾刘建红王利颖石洁
Owner BEIJING UNIV OF TECH
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