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Method for adjusting and controlling character of mixed liquor in membrane bioreactor for controlling membrane pollution

A technology of mixed liquid and membrane control, applied in chemical instruments and methods, biological water/sewage treatment, oxidized water/sewage treatment, etc. The water quality is stable, the structure is compact, and the effect of improving membrane filtration performance

Inactive Publication Date: 2006-09-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no reports on the use of ozone technology for the regulation of the activated sludge mixture in membrane bioreactors to control membrane fouling.
There are related patents on the combination of ozone technology and activated sludge method, but it is mainly aimed at the method of using ozone to reduce the amount of excess sludge in the activated sludge water treatment process in order to reduce the amount of excess sludge, such as " A method and device for reducing the amount of activated sludge by using ozone oxidation (Chinese invention patent 03138936.8, application date 2003.7.30)", there is no research and research on the effect of ozone on the membrane filtration properties of the mixed liquid of the membrane bioreactor limit
At present, there are reports abroad that the application of ozone oxidation in the traditional activated sludge process can achieve the purpose of sludge reduction in the activated sludge process, but the application of ozone oxidation in the membrane bioreactor to achieve sludge reduction has not yet see the report

Method used

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  • Method for adjusting and controlling character of mixed liquor in membrane bioreactor for controlling membrane pollution
  • Method for adjusting and controlling character of mixed liquor in membrane bioreactor for controlling membrane pollution
  • Method for adjusting and controlling character of mixed liquor in membrane bioreactor for controlling membrane pollution

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Experimental program
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Effect test

Embodiment 1

[0016] figure 1 Represent the membrane bioreactor device of the ozone regulation mixed liquid of embodiment one, this device is made up of ozone generator 1, biological reaction tank 2, membrane module 3, outlet pump 4, aerator 5, ozone tail gas absorption tank 6, ozone reaction Pool 7, sludge circulation pump 8, sludge circulation pump 9 and other components. Compared with the traditional membrane bioreactor, the device adds an ozone action system composed of an ozone generator and an ozone reaction tank.

[0017] The structure of this embodiment combines figure 1 The details are as follows:

[0018] In this example, two membrane bioreactors are used to investigate the change of membrane resistance over time. The greater the rate of increase in membrane resistance, the faster the development of membrane fouling. one for figure 1 Shown is the membrane bioreactor 1 of the ozone system, and the traditional membrane bioreactor 2 without the ozone system.

[0019] The sludge ...

Embodiment 2

[0022] Ozone dosage (mg O 3 / g-SS)

[0023] It was found that the dosage of 100mg O 3 / g-SS, the rise rate of the membrane resistance of the two reactors is not much different. It shows that under this dosage, the effect of ozone on the mixed solution has almost no effect on the control of membrane fouling. But at 200, 300mg O 3 The increase rate of membrane resistance decreased by more than 35% and 40% respectively under the action of ozone at the dosage of / g-SS. It is proved that the effect of ozone on the mixed solution can control the development speed of membrane fouling in membrane bioreactor under this condition.

Embodiment 3

[0025]

[0026]It was found that when the sludge concentration was as low as 2g / L, the treatment of ozone aggravated the development of membrane fouling. However, under the normal operating conditions of the membrane bioreactor (sludge concentration above 4g / L), 120mg O 3 Ozone treatment with / g-SS dosage can play a role in slowing down membrane fouling. Even when the sludge concentration is as high as 20g / L, the resistance rise rate can be reduced by more than 90%.

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Abstract

For improving properties of mixed liquid in membrane biologic reactor, membrane pollution developing speed is controlled to stabilize operation of membrane biologic reactor. The invention provides a method that ozone is utilized to treat mixed liquid in membrane biologic reactor effectively to improve properties of mixed liquid thus to control membrane pollution. The partical steps are in following; ozone generator is used to produce ozone, ozone inventory is mot more than 1mg O3 / g-ss which is used to do centralized treatment for the mixed liquid in the membrane biologic reactor, or mud circulating pump is used to pump some mixed liquid in said membrane biologic reactor, or mud circulating pump is used to pump some mixed liquid in said membrane biologic reactor into ozone reaction tank to be treated by adding ozone that inventory is more than 100 mg O3 / g-ss, then treated mixed liquid is circulated into said membrane biologic reactor to be mixed with original mixed liquid.

Description

technical field [0001] The invention relates to a method for controlling the membrane fouling problem of a membrane bioreactor and regulating the properties of a mixed liquid, which belongs to the technical field of water and waste water treatment. Background technique [0002] Membrane bioreactor is an efficient wastewater treatment technology that combines biological reaction unit and membrane separation technology well. Microbes can be intercepted through the membrane, and the separation of hydraulic retention time and sludge age can be realized. The treatment efficiency of pollutants is high, and the effluent quality is high and stable; and the membrane bioreactor device has a compact structure and is easy to realize automatic control. But in the operation of membrane bioreactor, membrane fouling will inevitably occur. Membrane fouling leads to a decrease in membrane flux and an increase in the frequency of membrane cleaning, resulting in increased operating costs and s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/10C02F3/12C02F1/78
CPCY02W10/10
Inventor 黄霞吴金玲文湘华
Owner TSINGHUA UNIV
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