CN203613066U - Technical device for preventing tubular membrane of external membrane bio-reactor (MBR) from being blocked - Google Patents

Abstract

The utility model relates to the field of landfill leachate treatment, and provides a technical device for preventing an external tubular membrane of a membrane bio-reactor (MBR) from being blocked. The technical device comprises a denitrification tank, a nitration tank, a tubular membrane component and a vertical sedimentation basin, wherein the liquid at the upper part of a nitration pool in the nitration tank flows into the sedimentation basin through the upper end of the sedimentation basin; the water at the middle upper part of the sedimentation basin enters the tubular membrane component. A sludge return pump is also arranged under the sedimentation basin, so that the sludge in the middle of the sedimentation basin returns to the outside of the sedimentation basin according to the running condition. The technical device is reasonable in design and compact in structure; after the technical device is adopted, the activated sludge in the tank is held back, the load of the back tubular membrane is low, and the external tubular membrane is prevented from being blocked; the technical device is high in tubular membrane flux, large in water yield and good in water quality.

Description

A process device for preventing clogging of external MBR tubular membrane

technical field

The utility model relates to the field of garbage leachate treatment in urban garbage sanitary landfills, garbage incineration power plants, garbage transfer stations, etc., in particular to a process device for preventing the blockage of an external MBR tubular membrane.

Background technique

Landfill leachate is a kind of wastewater with high concentration of pollutants and extremely complicated water quality. At present, according to the requirements of the Ministry of Environmental Protection, the effluent meets the discharge standard of GB16889-2008. According to the relevant national regulations, the treatment process of "pretreatment + external MBR membrane bioreaction system + advanced treatment" is generally adopted.

The process of the external MBR membrane biological reaction system used is generally composed of A/O (denitrification tank/nitrification tank) + external tubular membrane. The external MBR membrane biological reaction system is a form of the current MBR process.

The MBR process refers to the membrane-bioreactor (Membrane Bio-Reactor, MBR), which is a new type of wastewater treatment system that combines membrane separation technology and biological treatment technology. Replace the terminal secondary sedimentation tank of traditional biological treatment technology with membrane modules, maintain a high concentration of active sludge in the membrane-bioreactor, increase the organic load of biological treatment, thereby reducing the footprint of sewage treatment facilities, and reduce the sludge load by maintaining low sludge load amount of residual sludge.

Therefore, the external MBR generally used for landfill leachate is composed of three parts: denitrification tank, nitrification tank and tubular membrane module. However, in the process of operation, the tubular membrane is often blocked, the water output of the tubular membrane is reduced, and the water output is small. If the tubular membrane is blocked, it needs to be shut down for cleaning, which will cause the problem of stopping the operation of the sewage system. . What's worse is that when the tubular membrane is seriously clogged, it is necessary to manually use tools to remove the pollution of the tubular membrane, which is very troublesome and takes several days to remove. The clogging problem of the tubular membrane once became the bottleneck of the development of the external MBR.

Utility model content

The technical problem to be solved by the utility model is to provide a process device for preventing the clogging of the external MBR tubular membrane, prevent the clogging of the external tubular membrane, and increase the water production of the tubular membrane.

In order to solve the above technical problems, the utility model provides a process device for preventing the clogging of the external MBR tubular membrane, which includes a denitrification tank, a nitrification tank and a tubular membrane module, and is characterized in that it also includes a vertical flow sedimentation tank, The liquid in the upper part of the nitrification tank in the nitrification tank flows into the sedimentation tank through the upper end of the sedimentation tank, and the effluent from the middle and upper parts of the sedimentation tank enters the tubular membrane module.

Preferably, the lower part of the sedimentation tank communicates with the nitrification tank, so that the mud in the sedimentation tank can flow into the nitrification tank without becoming dead mud.

Further optimized, in order to prevent the sludge in the sedimentation tank from becoming dead sludge, the bottom of the sedimentation tank is connected to the denitrification tank through a return pipe, and a sludge return pump is arranged on the return pipe.

More preferably, a regulating valve is provided on the return pipe, and the regulating valve and the return pump are opened to return the sludge to the denitrification tank according to the operation conditions of the sedimentation tank.

Most preferably, the sedimentation tank is a straight cylindrical device with open upper and lower ends, and the straight cylindrical device is vertically located in the nitrification tank.

The landfill leachate treatment device of the utility model has reliable operation and high integration, effectively retains activated sludge, prevents the clogging of the external tubular membrane, reduces the load of the tubular membrane module, and improves the efficiency of the tubular membrane. Water production rate.

Description of drawings

The technical solution of the present utility model will be further specifically described below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is the structural front view of the specific embodiment of the present utility model.

Fig. 2 is a top view of the connection between the nitrification tank and the tubular membrane module in the structure of the specific embodiment of the present invention.

Detailed ways

As shown in Figures 1 and 2, the incoming water first enters the denitrification tank 10, the upper part of the denitrification tank 10 effluent enters the nitrification tank 20, the bottom of the denitrification tank 10 and the nitrification tank 20 are connected through a return pipe, and the return pipe is provided with Return pump 5 and regulating valve 6. The aeration pipe provided with the blower 4 leads to the bottom of the nitrification tank 1 in the nitrification tank 20 . A vertical flow sedimentation tank 2 is arranged inside the nitrification tank 20. The sedimentation tank 2 is a straight cylinder 3 with open upper and lower ends. The liquid on the top of the nitrification tank 1 flows into the sedimentation tank 2 through the upper end of the straight cylinder 3. The sedimentation tank The effluent from the middle and upper part of 2 enters the tubular membrane module 30 through the wall of the nitrification tank 20 . The lower part of the sedimentation tank 2 communicates with the nitrification tank 1, so that the mud in the sedimentation tank 2 can flow into the nitrification tank 1 without becoming dead mud. In addition, in order to prevent the mud in the sedimentation tank from becoming dead mud, a regulating valve 7 is provided separately. According to the operation of the sedimentation tank 2, the regulating valve 7 and the return pump 5 are opened to return the mud to the front-end denitrification tank 20.

The activated sludge in the nitrification tank is initially collected through the sedimentation tank 2 to reduce the load entering the tubular membrane, and at the same time, a part of the sludge enters the tubular membrane system. It has been proved by practical operation and inspection that the landfill leachate treatment device of the utility model operates reliably, has high integration, effectively intercepts activated sludge, prevents the clogging of the external tubular membrane, and reduces the load of the tubular membrane module. The water production rate of the tubular membrane is improved.

Of course, those skilled in the art can easily imagine that the sedimentation tank 2 does not have to be arranged in the nitrification tank 20 . The settling tank 2 is separately arranged outside the nitrification tank 20, and is connected up and down with the nitrification tank 20 to achieve the same technical effect as the above-mentioned specific embodiment, so details are not repeated here.

Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to preferred embodiments, those of ordinary skill in the art should understand that this utility model can be Any modification or equivalent replacement of the technical solution of the utility model without departing from the spirit and scope of the technical solution of the utility model shall be covered by the claims of the utility model.

Claims (5)

1. one kind prevents the process unit of the obstruction of external placed type MBR tubular membrane, comprise denitrification tank, nitrating pot and external placed type tubular membrane component, it is characterized in that, also comprise vertical sedimentation basin, the liquid on the nitrification tank top in described nitrating pot flows in settling tank by the upper end of described settling tank, and the middle and upper part water outlet of described settling tank enters described tubular membrane component.

2. the process unit of a kind of obstruction that prevents external placed type MBR tubular membrane according to claim 1, is characterized in that, described settling tank bottom is communicated with described nitrification tank.

3. the process unit of the obstruction that prevents external placed type MBR tubular membrane according to claim 1 and 2, is characterized in that, the bottom of described settling tank is communicated with described denitrification tank by return line, and described return line is provided with sludge reflux pump.

4. the process unit of the obstruction that prevents external placed type MBR tubular membrane according to claim 3, is characterized in that, on described return line, is provided with variable valve.

5. the process unit of the obstruction that prevents external placed type MBR tubular membrane according to claim 1, is characterized in that, described settling tank is the open straight-tube shape device of a upper and lower ends, and described straight-tube shape device is vertically positioned at nitrating pot.

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