Biological floc concentration device and submerged sludge treatment system

Abstract

The utility model discloses a biological floc concentration device and a submerged sludge treatment system, which relate to the technical field of sewage treatment and comprise an anti-backflow cone, an overflow flow guide mechanism, an overflow check ring plate, a separation sludge discharge barrel, a top cover plate and a fixed connecting rod, the overflow flow guide mechanism comprises an overflow water collecting tank and an overflow flow guide water outlet pipe which are coaxially arranged and communicated with each other, and the anti-backflow cone is fixedly arranged on the circumferential outer wall surface of the overflow flow guide water outlet pipe, is coaxially arranged with the overflow flow guide water outlet pipe and is located on the inner side below the overflow check ring plate; the small-diameter end of the top of the anti-backflow cone is arranged upwards, and a flow guide gap is reserved between the anti-backflow cone and the inner wall face of the sludge discharging barrel. According to the biological floc concentration device disclosed by the utility model, the anti-backflow cone is positively arranged in the conical cylinder of the cyclone, so that the separated biological floc and a carrier are prevented from being reversely mixed again, a cone selection part of a conventional cyclone concentrator is canceled, and the mounting height of the biological floc concentration device can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a biological floc concentrating device and a submerged sludge treatment system. Background Art

[0002] At present, the "activated sludge" method is commonly used in the treatment of municipal sewage. In the process of sewage treatment, the activity of aging microorganisms will gradually decrease, which means that the treatment capacity is constantly decreasing. In addition, if the dead microorganisms cannot be discharged from the treatment unit in time, it will reversely cause the deterioration of water quality. Therefore, the discharge of residual sludge is essential. The function of the secondary sedimentation tank is to precipitate the activated sludge and produce relatively clear water to enter the next treatment unit. Most of the precipitated sludge is returned to the biochemical tank, and the other part is discharged as residual sludge, aiming to discharge the dead microorganisms from the system and maintain the operation effect of the system.

[0003] High-concentration composite powder biological fluidized bed technology increases the sludge concentration in the biochemical pool by adding composite powder carriers, achieves the enrichment of functional microbial flora during operation, and improves water quality and quantity. However, when the sludge concentration is increased, the secondary sedimentation tank cannot effectively load, so a cyclone concentrator is used before the secondary sedimentation tank.

[0004] In the prior art, the cyclone is mainly composed of two parts: a column and a cone. The smaller the cone angle, the smaller the concentration effect, and the larger the diameter of the column, the greater the water treatment volume. However, under the premise of a certain cone angle, the larger the column diameter, the longer the overall length of the cyclone, which leads to inconvenient construction and difficult installation and operation. As a result, the diameter of the straight cylinder part of the existing cyclone concentrator cannot be effectively increased, and the treatment volume of a single group of cyclone concentrators is small.

[0005] In view of this, it is necessary to provide a biological floc concentrating device to solve the technical problem that the existing cyclone concentrator needs to be higher when increasing the water treatment capacity. Utility Model Content

[0006] The biological floc concentrating device provided by the utility model solves the technical problem that the existing cyclone separator has poor separation effect.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] A biological floc concentrating device comprises an anti-backflow cone, an overflow guide mechanism, an overflow baffle plate, a separation mud discharge cylinder, a top cover plate and a fixed connecting rod, wherein the upper portion of the separation mud discharge cylinder is provided with a liquid inlet, the lower portion of the separation mud discharge cylinder is provided with a mud discharge port, the top cover plate is covered on the top opening of the separation mud discharge cylinder, the overflow baffle plate is located on the inner side of the separation mud discharge cylinder and is coaxially arranged with the separation mud discharge cylinder, the first end of the overflow baffle plate is fixedly arranged on the top cover plate, the second end of the overflow baffle plate extends downward to below the liquid inlet, the overflow guide mechanism comprises an overflow water collecting trough and an overflow guide outlet pipe which are coaxially arranged and interconnected, the overflow water collecting trough and the overflow guide outlet pipe are both located at the overflow baffle plate. On the inner side of the ring plate, the overflow diversion water outlet pipe is arranged vertically and fixed to the bottom of the separation mud discharge cylinder by a fixed connecting rod. The overflow diversion water outlet pipe is coaxially arranged with the separation mud discharge cylinder. The water inlet end of the overflow diversion water outlet pipe extends upward to the liquid inlet position. The overflow collecting trough is arranged at the water inlet end of the overflow diversion water outlet pipe. The water outlet end of the overflow diversion water outlet pipe extends out of the separation mud discharge cylinder. The anti-backflow cone is fixed on the circumferential outer wall surface of the overflow diversion water outlet pipe and is coaxially arranged with the overflow diversion water outlet pipe. The anti-backflow cone is on the inner side below the overflow baffle plate, and the top small diameter end of the anti-backflow cone is arranged upward. A diversion gap is left between the anti-backflow cone and the inner wall surface of the mud discharge cylinder.

[0009] Furthermore, the backflow prevention cone is a solid cone, and the overflow diversion outlet pipe passes through the central hole of the backflow prevention cone and is sealed and fixedly connected to the wall surface of the hole.

[0010] Furthermore, the backflow prevention cone is a hollow cone, the overflow diversion outlet pipe passes through the top of the backflow prevention cone and is sealed and fixedly connected to the top of the cone, and the biological floc concentration device also includes a fixed umbrella frame, the first end of the fixed umbrella frame is fixedly connected to the inner wall surface of the hollow cone, and the second end of the fixed umbrella frame is fixedly connected to the overflow diversion outlet pipe.

[0011] Furthermore, the first end of the fixed connecting rod is fixedly connected to the separation and mud discharge cylinder, and the second end of the fixed connecting rod is fixedly connected to the overflow diversion outlet pipe.

[0012] Furthermore, the fixed connecting rod is located below the backflow prevention cone, the second end of the fixed connecting rod is arranged to be tilted upward, and a plurality of fixed connecting rods are evenly spaced along the circumference of the overflow diversion outlet pipe.

[0013] Furthermore, the biological floc concentrating device also includes a scraper mechanism, which includes a scraper motor, a scraper driving cross frame, a scraper connecting rod and a scraper plate. The scraper motor is fixed on the top cover plate and the output shaft of the scraper motor extends downward into the separation mud discharge cylinder. A scraper driving cross frame is provided on the output shaft of the scraper motor. A scraper connecting rod is provided at the cantilever end of the scraper driving cross frame. A scraper plate is provided at the bottom of the scraper connecting rod. The scraper connecting rod is located between the anti-backflow cone and the overflow baffle plate. The scraper plate is arranged toward the bottom of the separation mud discharge cylinder and is arranged parallel to the bottom surface of the separation mud discharge cylinder.

[0014] Furthermore, the mud scraper connecting rod is a telescopic rod.

[0015] Furthermore, the scraper driving cross frame is a cross, and four scraper connecting rods are evenly spaced and arranged at the outer end of the cross along the circumferential direction.

[0016] Furthermore, the separation and mud discharge cylinder comprises an equal-diameter separation cylinder, a mud guide cone cylinder and a mud collecting bucket, and the equal-diameter separation cylinder, the mud guide cone cylinder and the mud collecting bucket are sequentially connected along the height direction.

[0017] The utility model also provides a submerged sludge treatment system, comprising the above-mentioned biological floc concentrating device.

[0018] The utility model has the following beneficial effects:

[0019] The biological floc concentrating device of the utility model comprises an anti-backflow cone, an overflow guiding mechanism, an overflow baffle plate, a separation mud discharge cylinder and a top cover plate, wherein the liquid inlet is arranged tangentially at the upper part of the separation mud discharge cylinder, and the anti-backflow cone cooperates with the separation mud discharge cylinder, and the sludge enters the separation mud discharge cylinder tangentially and undergoes cyclone separation, the top small-diameter end of the anti-backflow cone is arranged upward, and the bottom large-diameter end of the anti-backflow cone is arranged downward, so as to prevent the heavy and light substances that have been separated from each other from flowing back and causing re-mixing, and the anti-backflow cone can be installed to effectively suppress the generation of backmixing, and the separation mud discharge cylinder of the utility model can cancel the cone selection part of the conventional cyclone concentrator, and can reduce the installation height of the biological floc concentrating device.

[0020] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0022] Figure 1This is one of the three-dimensional structural schematic diagrams of a biological floc concentrating device in one embodiment of the utility model;

[0023] Figure 2 This is the second schematic diagram of the three-dimensional structure of the biological floc concentrating device in one embodiment of the utility model;

[0024] Figure 3 It is a structural schematic diagram of a submerged sludge treatment system in one embodiment of the utility model.

[0025] Description of Figure Numbers:

[0026] 100, biological floc concentration device; 10, anti-backflow cone; 20, overflow diversion mechanism; 21, overflow water collecting tank; 22, overflow diversion outlet pipe; 30, overflow baffle plate; 40, separation and discharge mud cylinder; 41, equal-diameter separation cylinder; 42, mud guide cone cylinder; 43, mud collecting bucket; 50, top cover plate; 60, fixed umbrella frame; 70, fixed connecting rod; 80, mud scraping mechanism; 81, mud scraping motor; 82, mud scraping drive cross frame;

[0027] 83. Mud scraper connecting rod; 84. Mud scraper blade. DETAILED DESCRIPTION

[0028] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0032] like Figure 1 and Figure 2 As shown, the utility model provides a biological floc concentrating device 100, including an anti-backflow cone 10, an overflow guide mechanism 20, an overflow baffle plate 30, a separation mud discharge cylinder 40, a top cover plate 50 and a fixed connecting rod 70, wherein the upper portion of the separation mud discharge cylinder 40 is provided with a liquid inlet, the top cover plate 50 is covered on the top opening of the separation mud discharge cylinder 40, the overflow baffle plate 30 is located on the inner side of the separation mud discharge cylinder 40 and is coaxially arranged with the separation mud discharge cylinder 40, the first end of the overflow baffle plate 30 is fixedly arranged on the top cover plate 50, and the second end of the overflow baffle plate 30 extends downward to the bottom of the liquid inlet, the overflow guide mechanism 20 includes an overflow water collecting trough 21 and an overflow guide outlet pipe 22 which are coaxially arranged and interconnected, and the overflow water collecting trough 21 and the overflow guide outlet pipe 22 are both located at the overflow On the inner side of the baffle plate 30, the overflow diversion water outlet pipe 22 is arranged vertically and fixed to the bottom of the separation mud discharge cylinder 40 by a fixed connecting rod 70. The overflow diversion water outlet pipe 22 is coaxially arranged with the separation mud discharge cylinder 40, and the water inlet end of the overflow diversion water outlet pipe 22 extends upward to the liquid inlet position. The overflow collecting trough 21 is arranged at the water inlet end of the overflow diversion water outlet pipe 22, and the water outlet end of the overflow diversion water outlet pipe 22 extends to the outside of the separation mud discharge cylinder 40. The anti-backflow cone 10 is fixed on the circumferential outer wall surface of the overflow diversion water outlet pipe 22 and is coaxially arranged with the overflow diversion water outlet pipe 22. The anti-backflow cone 10 is on the inner side below the overflow baffle plate 30, and the top small diameter end of the anti-backflow cone 10 is set upward, leaving a diversion gap between the anti-backflow cone 10 and the inner wall surface of the mud discharge cylinder.

[0033] The biological floc concentrating device 100 of the utility model comprises a backflow prevention cone 10, an overflow guide mechanism 20, an overflow baffle plate 30, a separation mud discharge cylinder 40 and a top cover plate 50. The liquid inlet is arranged tangentially at the upper part of the separation mud discharge cylinder 40. The backflow prevention cone 10 cooperates with the separation mud discharge cylinder 40. After the sludge enters the separation mud discharge cylinder 40 along the tangential direction, it is subjected to cyclone separation. The top small-diameter end of the backflow prevention cone 10 is arranged upward, and the bottom large-diameter end of the backflow prevention cone 10 is arranged downward to prevent the backflow of heavy substances and light substances that have been separated from each other and cause re-mixing. After the backflow prevention cone is installed, the generation of backmixing can be effectively suppressed. The separation mud discharge cylinder 40 in the utility model can cancel the cone selection part of the conventional cyclone concentrator, and the installation height of the biological floc concentrating device 100 can be reduced.

[0034] It can be understood that the backflow prevention cone 10 can be a cone or a truncated cone. As long as the large-diameter end of the bottom of the backflow prevention cone 10 is arranged below the small-diameter end of the top so that the backflow prevention cone 10 is placed upright, the radial dimension of the backflow prevention cone 10 gradually shrinks from the bottom to the top, and the backflow prevention cone 10 can suppress the generation of backmixing; it can be understood that the mud discharge port is connected to the sludge return pipe; in the utility model, the specific size of the backflow prevention cone 10 can be set according to actual conditions; the guide gap is set according to actual conditions.

[0035] Furthermore, the backflow prevention cone 10 is a solid cone, and the overflow diversion water outlet pipe 22 passes through the central hole of the backflow prevention cone 10 and is sealed and fixedly connected to the hole wall. The bottom surface of the backflow prevention cone 10 is provided to block and suppress back mixing.

[0036] Furthermore, the backflow prevention cone 10 is a hollow cone, the overflow diversion water outlet pipe 22 passes through the cone top of the backflow prevention cone 10 and is sealed and fixedly connected to the cone top, and the biological floc concentrating device 100 also includes a fixed umbrella frame 60, the first end of the fixed umbrella frame 60 is fixedly connected to the inner wall surface of the hollow cone, and the second end of the fixed umbrella frame 60 is fixedly connected to the overflow diversion water outlet pipe 22. The backflow prevention cone 10 is provided with a conical surface to block and suppress back mixing.

[0037] Furthermore, in order to facilitate the fixation of the overflow diversion mechanism 20 and prevent the overflow diversion mechanism 20 and the anti-backflow cone 10 from swinging during operation, the biological floc concentrating device 100 also includes a fixed connecting rod 70 at the bottom of the separation and mud discharge cylinder 40, and the first end of the fixed connecting rod 70 is fixedly connected to the separation and mud discharge cylinder 40, and the second end of the fixed connecting rod 70 is fixedly connected to the overflow diversion outlet pipe 22.

[0038] Further, the fixed connecting rod 70 is located below the anti-backflow cone 10, and the second end of the fixed connecting rod 70 is arranged to tilt upward, and multiple fixed connecting rods 70 are evenly spaced along the circumference of the overflow diversion outlet pipe 22. Optionally, the number of the fixed connecting rods 70 can be two, three, four or other numbers.

[0039] Furthermore, in order to facilitate mud discharge, the biological floc concentrating device 100 also includes a mud scraping mechanism 80, which includes a mud scraping motor 81, a mud scraping driving cross frame 82, a mud scraping connecting rod 83 and a mud scraping plate 84. The mud scraping motor 81 is fixed on the top cover plate 50 and the output shaft of the mud scraping motor 81 extends downward into the separation mud discharge cylinder 40. The mud scraping motor 81 is provided with a mud scraping driving cross frame 82 on the output shaft, and a mud scraping connecting rod 83 is provided at the cantilever end of the mud scraping driving cross frame 82. A mud scraping plate 84 is provided at the bottom of the mud scraping connecting rod 83. The mud scraping connecting rod 83 is located between the anti-backflow cone 10 and the overflow baffle plate 30. The mud scraping plate 84 is arranged toward the bottom of the separation mud discharge cylinder 40 and is arranged parallel to the bottom surface of the separation mud discharge cylinder 40.

[0040] Furthermore, the scraper driving cross frame 82 is a cross, and four scraper connecting rods 83 are evenly spaced and arranged at the outer end of the cross along the circumferential direction.

[0041] Further, the separation and discharge mud cylinder 40 comprises an equal-diameter separation cylinder 41, a mud guide cone 42 and a mud collecting bucket 43, which are sequentially connected along the height direction. It can be understood that the inclination angle of the conical surface of the mud guide cone 42 is 10 to 30 degrees.

[0042] The biological floc concentrator 100 of the utility model has a liquid inlet, and the mixed liquid of the biochemical pool enters tangentially along the pool wall from the liquid inlet to generate a vortex in the biological floc concentrator 100; the overflow baffle plate 30 plays a separating role to prevent the mud sample at the liquid inlet from mixing with the overflow light mud sample and maintain the stability of the internal vortex state; the anti-backflow cone 10 is arranged upright and fixedly connected to the outer wall of the overflow diversion water outlet pipe 22 at the center position, and the bottom angle is 45° to 60° to prevent the biological flocs and carriers that have been separated from each other from being mixed again at the bottom. After the anti-backflow cone is installed, the generation of backmixing can be effectively suppressed. No holes or inclined pipes are set on the anti-backflow cone. The upright design of the anti-backflow cone can form a backflow barrier for the light biological flocs and broken carriers that have been separated inside. The upward thrust can reduce the inlet pressure. The design of the anti-backflow cone can eliminate the cone part of the conventional cyclone concentrator and reduce the height of the overall cyclone concentrator. The scraper drive cross frame 82 and the scraper connecting rod 83 connect the scraper plate 84 and the scraper motor 81. The scraper plate 84 is used to sweep the inclined mud guide surface of the mud guide cone 42 to scrape the mud into the mud collecting bucket: Mud collecting bucket: the heavy sludge after cyclone concentration flows into the bottom mud collecting bucket, and then flows back to the front end of the biochemical pool by the external reflux pump; the overflow water collection tank 21 collects the overflow light sludge; the overflow diversion outlet pipe 22, the overflow light sludge enters the secondary sedimentation tank through the overflow outlet pipe; the mud collecting bucket collects the heavy sludge; the sludge return pipe: the heavy sludge is collected and flows back to the front end of the biochemical pool through the return pipe.

[0043] Specifically, the inner diameter of the mud collecting bucket is 1 / 20 to 1 / 3 of the height of the equal-diameter separation cylinder 41, the height of the mud guiding cone 42 is 1 / 20 to 1 / 3 of the height of the equal-diameter separation cylinder 41, the separation mud discharge cylinder 40 is formed by concrete masonry, the liquid inlet is arranged tangentially to the equal-diameter separation cylinder 41, the mud discharge port is located on the bottom center axis of the mud collecting bucket, and the water outlet end of the overflow diversion outlet pipe 22 is bent and passes through the side wall of the mud collecting bucket to extend out of the separation mud discharge cylinder 40.

[0044] Please refer to Figure 3 The utility model also provides a submerged sludge treatment system, including the above-mentioned biological flocculation concentrating device 100, a biochemical tank and a secondary sedimentation tank, the biochemical tank includes an anaerobic tank, an anoxic tank and an aerobic tank arranged in sequence, the secondary sedimentation tank is located downstream of the biological flocculation concentrating device 100, the heavy outlet of the secondary sedimentation tank is connected to the return port of the anaerobic tank, the sludge outlet of the biological flocculation concentrating device 100 is connected to the return port of the anaerobic tank through a sludge return pipe, the water outlet end of the overflow diversion outlet pipe 22 of the biological flocculation concentrating device 100 is connected to the water inlet side of the secondary sedimentation tank, the liquid inlet of the biological flocculation concentrating device 100 is provided with a liquid inlet pipe, the liquid inlet pipeline is connected to the pump body, and the pump body is located at the bottom of the aerobic tank.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A biological floc concentrating device, characterized in that: It includes a backflow prevention cone, an overflow guide mechanism, an overflow baffle plate, a separation and discharge mud cylinder, a top cover plate and a fixed connecting rod. The upper part of the separation mud discharge cylinder is provided with a liquid inlet, the lower part of the separation mud discharge cylinder is provided with a mud discharge port, the top cover plate is covered on the top opening of the separation mud discharge cylinder, the overflow baffle plate is located on the inner side of the separation mud discharge cylinder and is coaxially arranged with the separation mud discharge cylinder, the first end of the overflow baffle plate is fixedly arranged on the top cover plate, and the second end of the overflow baffle plate extends downward to below the liquid inlet, The overflow diversion mechanism comprises an overflow water collecting trough and an overflow diversion water outlet pipe which are coaxially arranged and interconnected, the overflow water collecting trough and the overflow diversion water outlet pipe are both located on the inner side of the overflow baffle plate, the overflow diversion water outlet pipe is arranged vertically and fixed to the bottom of the separation mud discharge cylinder body by a fixed connecting rod, the overflow diversion water outlet pipe is coaxially arranged with the separation mud discharge cylinder body, the water inlet end of the overflow diversion water outlet pipe extends upward to the position of the liquid inlet, the overflow water collecting trough is arranged at the water inlet end of the overflow diversion water outlet pipe, and the water outlet end of the overflow diversion water outlet pipe extends out of the separation mud discharge cylinder body, The backflow prevention cone is fixed on the circumferential outer wall surface of the overflow diversion outlet pipe and is coaxially arranged with the overflow diversion outlet pipe. The backflow prevention cone is located on the inner side below the overflow baffle plate. The top small diameter end of the backflow prevention cone is set upward, and a diversion gap is left between the backflow prevention cone and the inner wall surface of the mud discharge cylinder.

2. The biological floc concentrating device according to claim 1, characterized in that: The backflow prevention cone is a solid cone, and the overflow diversion water outlet pipe passes through the central hole of the backflow prevention cone and is sealed and fixedly connected to the hole wall.

3. The biological floc concentrating device according to claim 1, characterized in that: The backflow prevention cone is a hollow cone, and the overflow diversion water outlet pipe passes through the top of the backflow prevention cone and is sealed and fixedly connected to the top of the cone. The biological floc concentrating device further comprises a fixed umbrella frame, a first end of which is fixedly connected to the inner wall surface of the hollow cone, and a second end of which is fixedly connected to the overflow diversion outlet pipe.

4. The biological flocculation concentration device according to any one of claims 1 to 3, characterized in that: The first end of the fixed connecting rod is fixedly connected to the separation and discharge mud cylinder, and the second end of the fixed connecting rod is fixedly connected to the overflow diversion outlet pipe.

5. The biological floc concentrating device according to claim 4, characterized in that: The fixed connecting rod is located below the anti-backflow cone, and the second end of the fixed connecting rod is arranged to tilt upward. The plurality of fixed connecting rods are evenly spaced along the circumference of the overflow diversion water outlet pipe.

6. The biological flocculation concentration device according to any one of claims 1 to 3, characterized in that: The biological floc concentrating device further comprises a scraping mechanism, which comprises a scraping motor, a scraping driving cross frame, a scraping connecting rod and a scraping plate. The scraper motor is fixed on the top cover plate and the output shaft of the scraper motor extends downward into the separation mud discharge cylinder. The scraper drive cross frame is provided on the output shaft of the scraper motor. The scraper connecting rod is provided at the cantilever end of the scraper drive cross frame. The scraper plate is provided at the bottom of the scraper connecting rod. The scraper connecting rod is located between the anti-backflow cone and the overflow baffle plate. The scraper plate is arranged toward the bottom of the separation mud discharge cylinder and is arranged parallel to the bottom surface of the separation mud discharge cylinder.

7. The biological flocculation concentration device according to claim 6, characterized in that: The mud scraping connecting rod is a telescopic rod.

8. The biological flocculation concentration device according to claim 6, characterized in that: The scraper driving cross frame is a cross, and the four scraper connecting rods are evenly spaced and arranged at the outer end of the cross along the circumferential direction.

9. The biological flocculation concentration device according to any one of claims 1 to 3, characterized in that: The separation and mud discharge cylinder comprises an equal-diameter separation cylinder, a mud guide cone cylinder and a mud collecting bucket, and the equal-diameter separation cylinder, the mud guide cone cylinder and the mud collecting bucket are sequentially connected along the height direction.

10. A submerged sludge treatment system, characterized in that: It comprises the biological flocculation concentration device as described in any one of claims 1 to 9.

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