Front-end filtration and sludge control device for sewage membrane system treatment

Abstract

The utility model discloses a sewage membrane system treatment front-end filtration and sludge control device which comprises a membrane grid filtration unit, a sludge precipitation and discharge unit and an MBR membrane system, the membrane grid filtration unit is arranged above the sludge precipitation and discharge unit, and the MBR membrane system is arranged at the rear end of the sludge precipitation and discharge unit; a water inlet, a membrane grid filter, a water outlet pipe and a slag discharge port are arranged in the membrane grid filter unit, the water outlet pipe is arranged at the bottom of the membrane grid filter unit, and the water outlet pipe is communicated with the sludge precipitation and sludge discharge unit; the sludge sedimentation and discharge unit comprises a sedimentation tank, the upper part of the sedimentation tank is provided with a central guide cylinder connected with a water outlet pipe, the bottom of the sedimentation tank is provided with a sludge guide plate, the sludge guide plate is obliquely arranged, the upper part of the sedimentation tank is circumferentially provided with an effluent weir, and the effluent weir is communicated with the MBR membrane system. According to the utility model, the problems of serious membrane system pollution and too fast flux attenuation caused by too high suspended solid concentration after entering the MBR membrane system in the traditional biochemical treatment unit can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a sewage membrane system treatment front-end filtering and sludge control device. Background Art

[0002] The Membrane Bio-Reactor (MBR) is a novel wastewater treatment system that organically combines membrane separation technology with biological treatment technology. By replacing the secondary settling tank at the end of traditional biological treatment technology with membrane modules, the MBR maintains a high activated sludge concentration in the bioreactor, increasing the organic load of biological treatment, thereby reducing the wastewater treatment facility footprint and reducing excess sludge by maintaining a low sludge load.

[0003] Traditional biochemical treatment processes directly connect to the MBR membrane treatment system. When entering the MBR membrane system after the traditional biochemical treatment unit, the suspended solids (SS) concentration is too high, which can easily cause serious membrane system fouling and significantly affect the MBR membrane system's flux attenuation. Sludge pumps are also required within the MBR membrane tank to pump out sludge, making sludge concentration difficult to control. Utility Model Content

[0004] In order to solve the above-mentioned deficiencies in the prior art, the utility model provides a sewage membrane system treatment front-end filtration and sludge control device, which reduces the amount of sludge entering the MBR membrane system from biochemical sewage and improves the working efficiency of the MBR membrane system.

[0005] In order to achieve the above technical purpose, the technical solution adopted by this utility model is:

[0006] A front-end filtration and sludge control device for sewage membrane system treatment, comprising a membrane grid filtration unit, a sludge sedimentation and sludge discharge unit and an MBR membrane system, wherein the membrane grid filtration unit is arranged above the sludge sedimentation and sludge discharge unit, and the MBR membrane system is arranged at the rear end of the sludge sedimentation and sludge discharge unit; a water inlet, a membrane grid filter, an outlet pipe and a slag discharge port are provided in the membrane grid filtration unit, the outlet pipe is provided at the bottom of the membrane grid filtration unit, and the outlet pipe is connected to the sludge sedimentation and sludge discharge unit; the sludge sedimentation and sludge discharge unit comprises a sedimentation tank, a central guide tube connected to the outlet pipe is provided at the upper part of the sedimentation tank, a sludge guide plate is provided at the bottom of the sedimentation tank, the sludge guide plate is arranged obliquely, an outlet weir is provided circumferentially at the upper part of the sedimentation tank, and the outlet weir is connected to the MBR membrane tank; a membrane bioreactor is provided in the MBR membrane tank.

[0007] Furthermore, the membrane grid filter is a rotary drum membrane grid filter, and the filtration accuracy of the membrane grid filter is 0.5 mm.

[0008] Furthermore, a mud pump is provided at the bottom of the sedimentation tank.

[0009] Furthermore, a communicating pipe is provided between the MBR membrane tank and the sedimentation tank, and an electric valve is provided on the communicating pipe.

[0010] Preferably, a bell mouth is provided at the bottom of the central guide tube.

[0011] Preferably, the inclination angle of the sludge guide plate is 30 to 60°.

[0012] Preferably, the inclination angle of the sludge guide plate is 45°.

[0013] Preferably, the weir plate of the outlet weir is a triangular weir plate.

[0014] The beneficial effects of the utility model are:

[0015] This device filters the sludge from the biochemical system's effluent through a membrane grid filter unit before collecting it through a sludge settling and sludge discharge unit. This reduces the amount of sludge entering the MBR membrane system, thereby improving the system's efficiency. This device solves the problem of high suspended solids concentrations entering the MBR membrane system after conventional biochemical treatment units, causing severe membrane system contamination and rapid flux decay.

[0016] The device of the utility model connects the sedimentation tank and the MBR membrane tank through a communicating pipe, which can control the sludge concentration and sludge discharge frequency of the MBR membrane tank and meet the sludge discharge requirements of the membrane tank, thereby improving the stability of the MBR system and controlling the concentration and destination of the sludge in the sedimentation tank and the MBR membrane tank.

[0017] The device of the utility model is configured in an integrated manner and can form a complete set of equipment with a back-end deep processing unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.

[0020] Figure numerals: 1-water inlet, 2-membrane grid filter, 3-water outlet pipe, 4-center guide tube, 5-bell mouth, 6-sludge guide plate, 7-slag discharge port, 8-sludge pump, 9-weir plate, 10-electric valve, 11-sedimentation tank, 12-MBR membrane tank, 13-membrane bioreactor. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. The components of the embodiments of this application usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents the selected embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this application without creative efforts belong to the scope of protection of this application.

[0022] A front-end filtration and sludge control device for a sewage membrane system, as Figure 1 shown, includes a membrane grille filtration unit, a sludge sedimentation and sludge discharge unit, and an MBR membrane system. The membrane grille filtration unit is disposed above the sludge sedimentation and sludge discharge unit, and the MBR membrane system is disposed at the rear end of the sludge sedimentation and sludge discharge unit; an inlet 1, a membrane grille filter 2, an outlet pipe 3, and a slag discharge port 7 are provided in the membrane grille filtration unit. The outlet pipe 3 is disposed at the bottom of the membrane grille filtration unit, and the outlet pipe 3 communicates with the sludge sedimentation and sludge discharge unit; the sludge sedimentation and sludge discharge unit includes a sedimentation tank 11. A central draft tube 4 connected to the outlet pipe 3 is provided in the upper part of the sedimentation tank 11. Preferably, a flared opening 5 is provided at the bottom of the central draft tube 4; a sludge guide plate 6 is provided at the bottom of the sedimentation tank 11. The sludge guide plate 6 is inclined. Preferably, the inclination angle of the sludge guide plate 6 is 30 to 60°; an overflow weir is provided in the upper part of the sedimentation tank 11, and the overflow weir communicates with the MBR membrane tank 12; preferably, the weir plate 9 of the overflow weir is a triangular weir plate. A membrane bioreactor 13 is provided in the MBR membrane tank 12.

[0023] Preferably, the membrane grille filter 2 is a drum-type membrane grille filter, and the filtration accuracy of the membrane grille filter 2 is 0.5 mm. Micro-particles with a particle diameter ≥ 0.5 mm are filtered by the membrane grille filter 2.

[0024] A sludge discharge pump 8 is provided at the bottom of the sedimentation tank 11 to regularly discharge the sludge in the sedimentation tank 11 to the outside. Further, a communicating pipe is provided between the MBR membrane tank 12 and the sedimentation tank 11, and an electric valve 10 is provided on the communicating pipe. By controlling the opening and closing of the electric valve 10, the communication between the MBR membrane tank 12 and the sedimentation tank 11 is realized. When the sludge discharge pump 8 is turned on, the sludge in the MBR membrane tank 12 can be discharged. Thus, the sludge discharge control of the MBR membrane tank can be carried out through the same sludge discharge pump 8, and the sludge concentration and sludge discharge times of the MBR membrane tank can be controlled.

[0025] The device of this utility model has a water inlet 1 connected to the front-end biochemical system, providing a sealed water intake. The water inlet 1 feeds the biochemical inlet water into a membrane grid filter 2, which filters particles ≥0.5 mm through a rotary drum system. The filtered wastewater flows through an outlet pipe 3 and enters a sludge settling and discharge unit. The filtered residue is collected through a sludge discharge port 7 and collected by a collection device for periodic manual cleaning. The wastewater flows vertically through the outlet pipe 3, a central guide tube 4, and a bell mouth 5 into a sedimentation tank 11. A sludge deflector 6 with an inclination angle of 30 to 60 degrees is installed at the bottom of the sedimentation tank 11 to aid sludge sedimentation. The effluent from the sedimentation tank 11 flows through an outlet weir into the rear-end MBR membrane tank 12. A sludge pump 8 at the bottom of the sedimentation tank 11 periodically discharges the sludge. A connecting pipe is provided between the MBR membrane tank 12 and the sedimentation tank 11. Opening the electric valve 10 on the connecting pipe allows the sludge in the MBR membrane tank 12 to be discharged through the sludge pump 8.

[0026] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A front-end filtration and sludge control device for a sewage membrane system, characterized in that: It includes a membrane grille filtration unit, a sludge sedimentation and sludge discharge unit, and an MBR membrane system. The membrane grille filtration unit is arranged above the sludge sedimentation and sludge discharge unit, and the MBR membrane system is arranged at the rear end of the sludge sedimentation and sludge discharge unit. An inlet (1), a membrane grille filter (2), a water outlet pipe (3), and a slag discharge port (7) are provided in the membrane grille filtration unit. The water outlet pipe (3) is arranged at the bottom of the membrane grille filtration unit, and the water outlet pipe (3) is connected to the sludge sedimentation and sludge discharge unit. The sludge sedimentation and sludge discharge unit includes a sedimentation tank (11). A central draft tube (4) connected to the water outlet pipe (3) is provided at the upper part of the sedimentation tank (11). A sludge guide plate (6) is provided at the bottom of the sedimentation tank (11). The sludge guide plate (6) is inclined. An overflow weir is provided along the circumference at the upper part of the sedimentation tank (11), and the overflow weir is connected to an MBR membrane tank (12). A membrane bioreactor (13) is provided in the MBR membrane tank (12).

2. The front-end filtration and sludge control device for sewage membrane system treatment according to claim 1, characterized in that: The membrane grille filter (2) is a drum-type membrane grille filter, and the filtration accuracy of the membrane grille filter (2) is 0.5 mm.

3. The front-end filtration and sludge control device for sewage membrane system treatment according to claim 1, wherein: A sludge discharge pump (8) is arranged at the bottom of the sedimentation tank.

4. The front-end filtration and sludge control device for sewage membrane system treatment according to claim 3, characterized in that: A communicating pipe is arranged between the MBR membrane tank and the sedimentation tank, and an electric valve (10) is provided on the communicating pipe.

5. The front-end filtration and sludge control device for sewage membrane system treatment according to claim 1, wherein: A flared mouth (5) is provided at the bottom of the central draft tube (4).

6. The front-end filtration and sludge control device for sewage membrane system treatment according to claim 1, wherein: The inclination angle of the sludge guide plate (6) is 30 to 60°.

7. The front-end filtration and sludge control device for sewage membrane system treatment according to claim 6, characterized in that: The inclination angle of the sludge guide plate (6) is 45°.

8. The front-end filtration and sludge control device for sewage membrane system treatment according to claim 1, wherein: The weir plate (9) of the overflow weir is a triangular weir plate.

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