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Method for restricting membrane pollution by using photocatalysis oxidation of nano material

A technology for photocatalytic oxidation and membrane inhibition, which is applied in the field of membrane fouling, can solve the problems of reduced water production, increased operating costs, and reduced membrane flux, and achieves the effects of extending service life, saving power consumption, and increasing membrane flux.

Inactive Publication Date: 2008-07-23
XIAMEN UNIV
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  • Abstract
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Problems solved by technology

However, the fundamental reason restricting the large-scale application of membrane bioreactors is the problem of membrane fouling (Guiping, Huang Xia, Chen Ying, etc. The influence of membrane-bioreactor operating conditions on membrane filtration characteristics [J]. Environmental Science, 1999 , 20(3):38-41) Membrane fouling refers to the adsorption or deposition of solute molecules, colloidal particles and particulate matter in the separated feed liquid on the membrane surface or inside the membrane pores during the membrane filtration process, making the membrane pores smaller Or clogging, forming a gel layer or filter cake layer on the membrane surface, resulting in a continuous decrease in membrane flux or an increase in the driving pressure on both sides of the membrane, which directly leads to a decrease in water production and an increase in operating costs

Method used

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  • Method for restricting membrane pollution by using photocatalysis oxidation of nano material

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Experimental program
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Effect test

Embodiment 1

[0026] Membrane bioreactor feed water is simulated biological sewage, and the water quality is as follows: COD concentration is 800mg / L, ammonia nitrogen concentration is 10mg / L, pH value is 6.5, dissolved oxygen concentration is 2.0-4.0mg / L, hydraulic retention time is 5h, Sludge residence time is 5d, nano TiO 2 The hydraulic retention time of the photocatalytic oxidation reactor is 2h. Experimental results: After 20 days of operation, the membrane flux is 15-20L / m 2 h. Compared with ordinary membrane bioreactors, the membrane flux is increased by more than 50%.

Embodiment 2

[0028] Membrane bioreactor feed water is simulated biological sewage, and the water quality is as follows: COD concentration is 500mg / L, ammonia nitrogen concentration is 30mg / L, pH value is 7.5, dissolved oxygen concentration is 3.0mg / L, hydraulic retention time is 8h, sludge The residence time is 8d, nano-TiO 2 The hydraulic retention time of the photocatalytic oxidation reactor is 3h. Experimental results: After 20 days of operation, the membrane flux is 15-20L / m 2 h. Compared with ordinary membrane bioreactors, the membrane flux is increased by more than 50%.

Embodiment 3

[0030] Membrane bioreactor feed water is simulated biological sewage, and the water quality is as follows: COD concentration is 500mg / L, ammonia nitrogen concentration is 60mg / L, pH value is 8.5, dissolved oxygen concentration is 4.0mg / L, hydraulic retention time is 10h, sludge The residence time is 10d, nano-TiO 2 The hydraulic retention time of the photocatalytic oxidation reactor is 5h. After running for 20 days, the membrane flux is 15-20L / m 2 h. Compared with ordinary membrane bioreactors, the membrane flux is increased by more than 50%.

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Abstract

The invention discloses a method that adopts photo catalytic oxidation of nano materials to restrain membrane fouling, which relates to a membrane fouling. The method that adopts photo catalytic oxidation of nano materials to restrain membrane fouling is provided. A membrane biological reactor and a nano TiO2 photo catalytic oxidation reactor are arranged, wherein, a water inlet end of the nano TiO2 photo catalytic oxidation reactor is communicated with a water outlet end of a biological reactor of the membrane biological reactor; a water outlet end of the nano TiO2 photo catalytic oxidation reactor is communicated with a water inlet end of a membrane separation component of the membrane biological reactor. Waste water is led in the water inlet end of the biological reactor of the membrane biological reactor of a nanao TiO2 photo catalytic oxidation membrane and a water outlet end of the membrane separation component is communicated with a recycling water pipe; a power switch is connected and a water inlet pump at the water inlet end of the biological reactor is started; an ultraviolet radiation quartz light tube in the nano TiO2 photo catalytic oxidation reactor is started; the normal working state of equipment is kept; the power switch is turned off when work is required to be stopped.

Description

technical field [0001] The invention relates to membrane fouling, in particular to a method for inhibiting membrane biofouling by photocatalytic oxidation of nanometer materials. Background technique [0002] Membrane Bioreactor (MBR) is an efficient contaminated water treatment and reuse equipment that organically combines membrane separation technology and traditional biological treatment technology. It has developed rapidly in recent decades and has played a good role in the treatment and reuse of polluted water. However, the fundamental reason restricting the large-scale application of membrane bioreactors is the problem of membrane fouling (Guiping, Huang Xia, Chen Ying, etc. The influence of membrane-bioreactor operating conditions on membrane filtration characteristics [J]. Environmental Science, 1999 , 20(3):38-41) Membrane fouling refers to the adsorption or deposition of solute molecules, colloidal particles and particulate matter in the separated feed liquid on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/72C02F1/44C02F1/32B01J21/06
CPCY02W10/37
Inventor 孔健卢昌义
Owner XIAMEN UNIV
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