A sludge circulating device for a sedimentation tank

Abstract

The utility model provides a kind of sludge circulating device of sedimentation tank, belong to sewage treatment technical field, to solve the problem that inorganic particles are mixed in sludge, it is not conducive to the use in sludge reflux system, including the reflux pipe being connected between aeration tank and secondary sedimentation tank, reflux pipe is connected with the bottom of secondary sedimentation tank by sludge collecting hopper, filter mechanism is set on sludge collecting hopper, and filter mechanism includes funnel, installation cylinder is set on funnel, and the inner wall of installation cylinder is connected with arc filter screen, and arc filter screen middle part protrudes installation cylinder outside.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and more specifically, it relates to a sludge circulation device for sedimentation tanks. Background Technology

[0002] Wastewater treatment is the process of removing pollutants from domestic sewage and industrial wastewater through physical, biological, and chemical methods to meet discharge or reuse standards. In this process, sedimentation tanks play a crucial role, utilizing gravity settling to efficiently separate suspended solids (forming sludge) from the water, thereby purifying the water. To improve treatment efficiency and reduce waste production, an aeration tank preceding the sedimentation tank is used for microbial purification before the sludge enters the sedimentation tank for separation. Some of the activated sludge accumulated at the bottom of the sedimentation tank is specifically returned to the front-end aeration tank to replenish the microorganisms, achieving a cycle. However, the sludge produced from wastewater treatment contains not only decomposed suspended solids but also large solid particles such as sand, gravel, paper towels, and other mineral fibers, as well as other inorganic particles. These impurities remain mixed in with the sludge during the pretreatment stage, making them unsuitable for use in the sludge return system.

[0003] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a sludge circulation device for sedimentation tanks in order to achieve a more practical purpose. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a sludge circulation device for sedimentation tanks, which solves the problem that inorganic particles mixed in the sludge are not conducive to use in sludge return systems.

[0005] The purpose and effectiveness of this utility model's sludge circulation device for sedimentation tanks are achieved through the following specific technical means:

[0006] A sludge circulation device for a sedimentation tank includes a return pipe connected between an aeration tank and a secondary sedimentation tank. The return pipe is connected to the bottom of the secondary sedimentation tank via a sludge collection hopper. A filtration mechanism is provided on the sludge collection hopper. The filtration mechanism includes a funnel and an installation cylinder is provided on the funnel. An arc-shaped filter screen is connected to the inner wall of the installation cylinder, and the arc-shaped filter screen protrudes out of the installation cylinder from the middle.

[0007] Furthermore, the inner wall of the mounting cylinder is provided with a sliding groove, a movable ring is slidably arranged in the sliding groove, a paddle is inclinedly arranged on the inner wall of the movable ring, the paddle is flush with and abuts against the inclined surface of the arc-shaped filter screen, and a drive mechanism for driving the movable ring to rotate is provided on the mud collection hopper.

[0008] Furthermore, the driving mechanism includes a motor, the mounting cylinder is connected to the funnel by a mounting frame, a connecting shaft is rotatably mounted on the mounting frame, a gear is mounted at one end of the connecting shaft, and the other end is connected to the motor on the mounting frame. A rack is distributed on the outer periphery of the movable ring, and a notch is opened on the outer side of the mounting cylinder to communicate with the slide groove. The gear extends into the notch and meshes with the rack.

[0009] Furthermore, a connecting ring is provided at the top of the mounting cylinder, the outer diameter of which is larger than the diameter of the mounting cylinder, and the connecting ring covers the mounting frame.

[0010] Furthermore, the return pipe is connected to the funnel via a flange, and a leak is provided at the bottom of the bend in the return pipe.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The arc-shaped filter screen separates the secondary sedimentation tank from the funnel, thus blocking large inorganic particles in the sludge. The arc design also allows the blocked particles to slide to the top edge of the funnel, enabling the organic sludge to flow back smoothly into the aeration tank. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the sludge circulation device for a sedimentation tank according to this utility model.

[0014] Figure 2 This is a partial three-dimensional view of the structure of this utility model.

[0015] Figure 3 This is an exploded view of part of the structure of this utility model.

[0016] Figure 4 This is a cross-sectional view of the filtration mechanism in this utility model.

[0017] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0018] 1. Aeration tank; 2. Secondary sedimentation tank; 3. Sludge hopper; 4. Filter screen; 5. Return pipe; 6. Sludge pump; 7. Leakage outlet; 101. Sewage pipe; 102. Connecting pipe; 103. Return outlet; 201. Drainage outlet; 202. Sludge discharge outlet; 401. Funnel; 402. Mounting cylinder; 403. Connecting ring; 404. Arc-shaped filter screen; 405. Movable ring; 406. Rack; 407. Paddle; 408. Gear; 409. Motor; 410. Connecting shaft; 411. Notch; 412. Slide groove; 413. Flange; 414. Mounting frame. Detailed Implementation

[0019] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0020] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Example:

[0023] As attached Figure 1 To be continued Figure 4 As shown:

[0024] This utility model provides a sludge circulation device for a sedimentation tank, including a return pipe 5 connected between an aeration tank 1 and a secondary sedimentation tank 2. In the sedimentation circulation system for wastewater purification, one end of the aeration tank 1 flows into the secondary sedimentation tank 2 through a sewage pipe 101. After being purified by the aeration system, the sludge flows into the secondary sedimentation tank 2 through a connecting pipe 102 for sedimentation and separation. The supernatant after separation flows out through a drain outlet 201, while the sludge settles at the bottom of the secondary sedimentation tank 2. Each pipe is equipped with a valve (not shown in the figure). The sludge flow in the return pipe 5 is driven by a sludge pump 6, and its flow path is the prior art and will not be described in detail.

[0025] The return pipe 5 is connected to the bottom of the secondary sedimentation tank 2 via the sludge hopper 3. A filtration mechanism 4 is installed on the sludge hopper 3, such as... Figure 4As shown, the filtration mechanism 4 includes a funnel 401 on which sludge naturally accumulates. An installation cylinder 402 is provided on the funnel 401. An arc-shaped filter screen 404 is connected to the inner wall of the installation cylinder 402. The arc-shaped filter screen 404 protrudes out of the installation cylinder 402. The arc-shaped filter screen 404 blocks the secondary sedimentation tank 2 from the funnel 401, thus blocking large inorganic particles in the sludge. The arc-shaped design allows the blocked particles to slide to the top edge of the funnel 401, so that the organic sludge can flow smoothly back from the center of the funnel 401 to the aeration tank 1.

[0026] To prevent the arc-shaped filter screen 404 from clogging, a groove 412 is provided on the circumference of the inner wall of the mounting cylinder 402. A movable ring 405 is slidably arranged in the groove 412. A paddle 407 is inclinedly arranged on the inner wall of the movable ring 405. The paddle 407 is flush with and abuts against the inclined surface of the arc-shaped filter screen 404. When the movable ring 405 rotates, it can drive the paddle 407 to move on the upper surface of the arc-shaped filter screen 404, thereby clearing away large particles that have not passed through the arc-shaped filter screen 404.

[0027] The mud hopper 3 is equipped with a drive mechanism that drives the movable ring 405 to rotate. The drive mechanism includes a motor 409. The mounting cylinder 403 is connected to the side of the funnel 401 by a mounting frame 414. A connecting shaft 410 is rotatably mounted on the mounting frame 414. A gear 408 is mounted on one end of the connecting shaft 410, and the other end is connected to the motor 409 on the mounting frame 414. A rack 406 is distributed on the outer periphery of the movable ring 405. A notch 411 is opened on the outer side of the mounting cylinder 402, which communicates with the slide groove 412. The gear 408 extends into the notch 411 and meshes with the rack 406. The slide groove 412 is stepped and, in addition to wrapping the movable ring 405, also has a space to accommodate the rack 406. When the motor 409 drives the gear 408 to rotate through the connecting shaft 410, the rack 406 can drive the paddle 407 to work.

[0028] The top of the mounting cylinder 402 is also provided with a connecting ring 403. The outer diameter of the connecting ring 403 is larger than the diameter of the mounting cylinder 402. The connecting ring 403 fits into the bottom opening of the secondary sedimentation tank 2. It can be placed in the opening and connected by bolts. For airtightness, a sealing ring can be installed between the connecting ring 403 and the secondary sedimentation tank 2. The connecting ring 403 also covers the mounting frame 414 to reduce the contamination of the instruments inside the mounting frame 414.

[0029] The return pipe 5 is connected to the funnel 401 via flange 413, and a leak 7 is provided at the bottom of the bend of the return pipe 5. A valve is also provided at the leak 7. The diameter of the leak 7 is much smaller than the diameter of the return pipe 5, and the design at the bottom of the bend facilitates the discharge of excess sludge from the leak 7.

[0030] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A sludge circulation device for a sedimentation tank, characterized in that: The system includes a return pipe (5) connecting the aeration tank (1) and the secondary sedimentation tank (2). The return pipe (5) is connected to the bottom of the secondary sedimentation tank (2) through a sludge collection hopper (3). A filtration mechanism (4) is provided on the sludge collection hopper (3). The filtration mechanism (4) includes a funnel (401). An installation cylinder (402) is provided on the funnel (401). An arc-shaped filter screen (404) is connected to the inner wall of the installation cylinder (402). The arc-shaped filter screen (404) protrudes out of the installation cylinder (402) in the middle.

2. The sludge circulation device for a sedimentation tank as described in claim 1, characterized in that: The inner wall of the mounting cylinder (402) is provided with a groove (412), and a movable ring (405) is slidably arranged in the groove (412). A paddle (407) is inclinedly arranged on the inner wall of the movable ring (405). The paddle (407) is flush with and abuts against the inclined surface of the arc-shaped filter screen (404). The mud collection hopper (3) is provided with a drive mechanism to drive the movable ring (405) to rotate.

3. The sludge circulation device for a sedimentation tank as described in claim 2, characterized in that: The driving mechanism includes a motor (409), and a mounting frame (414) is connected to the mounting cylinder (402) and the funnel (401). A connecting shaft (410) is rotatably mounted on the mounting frame (414). A gear (408) is provided at one end of the connecting shaft (410), and the other end is connected to the motor (409) on the mounting frame (414). A rack (406) is distributed on the outer periphery of the movable ring (405). A notch (411) is provided on the outer side of the mounting cylinder (402) and communicates with the slide groove (412). The gear (408) extends into the notch (411) and meshes with the rack (406).

4. The sludge circulation device for a sedimentation tank as described in claim 3, characterized in that: The top of the mounting cylinder (402) is also provided with a connecting ring (403), the outer diameter of the connecting ring (403) is larger than the diameter of the mounting cylinder (402), and the connecting ring (403) covers the mounting frame (414).

5. The sludge circulation device for a sedimentation tank as described in claim 1, characterized in that: The return pipe (5) is connected to the funnel (401) via a flange (413), and a leak (7) is provided at the bottom of the bend of the return pipe (5).

Images