A high-load activated sludge screening sedimentation tank

Abstract

The present invention discloses a high-load activated sludge screening and sedimentation tank, belonging to the field of water treatment technology. The tank comprises a tank body and a high-throughput horizontal tube sedimentation and separation device. A sludge discharge area is provided at the bottom of the tank body. Above the sludge discharge area, an inlet area, a sludge selection area, a high-efficiency sedimentation area, and an outlet area are sequentially provided along the water flow direction. The inlet area is connected to the inflow end of the sludge selection area, and the high-efficiency sedimentation area is provided at the outflow end of the sludge selection area. A sludge return pump is connected to the inlet area and the sludge selection area for sludge return. A sludge discharge pump is connected to the high-efficiency sedimentation area and the outlet area for sludge discharge. The high-throughput horizontal tube sedimentation and separation device reciprocates along the sludge selection area toward the high-efficiency sedimentation area via an adaptive sliding module. Sedimentation and separation are performed simultaneously to achieve mud-water separation. The device also has an activated sludge screening function, greatly improving the pollutant removal efficiency of the front-end biochemical stage.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, in particular to a high-load activated sludge screening sedimentation tank. Background Art

[0002] The activated sludge process is a common process for treating municipal wastewater. The settling performance of activated sludge influences, and even determines, the settling efficiency of the secondary sedimentation tank and the effluent quality. Poor sludge settling performance will cause the sludge level in the sludge mixture to continue to rise after entering the secondary sedimentation tank, affecting the effluent quality. In the secondary sedimentation tank, gravity sedimentation is generally relied upon, and chemical reagents such as flocculants, coagulants, and phosphorus removal agents are not added to prevent sludge from flowing back into the biochemical system and harming microorganisms. In recent years, the country has been strengthening its water pollution control efforts, issuing a series of standards and policies, requiring the effluent quality of some urban sewage treatment plants to meet the Class A standard of the "Pollutant Discharge Standard for Urban Wastewater Treatment Plants" (GB 18918-2002).

[0003] Currently, sewage treatment plants typically add advanced treatment processes after secondary treatment to meet effluent quality targets, such as SS and total phosphorus. However, current land resource planning and construction cannot meet the land requirements of these new advanced treatment processes. Furthermore, secondary sedimentation tanks generally lack activated sludge screening capabilities, causing aged sludge to flow back into the aeration tank along with the activated sludge. This increases return flow, increases energy consumption, and reduces sewage treatment efficiency.

[0004] In summary, in view of the current process development limitations of secondary sedimentation tanks and deep treatment, a high-load sedimentation tank is needed that can screen and selectively return the sludge from the secondary sedimentation tank. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-load activated sludge screening sedimentation tank to solve the problem in the prior art that aged sludge is returned to the aeration tank together with the activated sludge, resulting in increased return volume, increased energy consumption and reduced sewage treatment efficiency.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A high-load activated sludge screening and sedimentation tank comprises a tank body and a high-throughput horizontal tube sedimentation and separation device, wherein a sludge discharge area is provided at the bottom of the tank body, and an inlet area, a sludge selection area, a high-efficiency sedimentation area and a water outlet area are sequentially provided above the sludge discharge area along the direction of water flow; the water inlet area is connected to the inflow end of the sludge selection area, and the high-efficiency sedimentation area is provided at the outflow end of the sludge selection area; the water inlet area and the sludge selection area are connected to a sludge return pump for sludge return; the high-efficiency sedimentation area and the water outlet area are connected to a sludge external discharge pump for sludge discharge; the high-throughput horizontal tube sedimentation and separation device moves back and forth from the sludge selection area to the high-efficiency sedimentation area through an adaptive sliding module for sludge screening and sedimentation.

[0008] As a further solution of the present invention, the sludge selection area includes a sludge storage hopper, which is connected to the sludge return pump through a sludge return pipe; a sludge discharge hopper is provided at the bottom of the high-efficiency sedimentation area, which is connected to the sludge discharge pump through a sludge discharge pipe.

[0009] As a further solution of the present invention, a support coupling module is connected to the bottom of the high-throughput horizontal tube sedimentation separation device, and the support coupling module is installed above the sludge storage hopper for positioning and fixing the high-throughput horizontal tube sedimentation separation device.

[0010] As a further solution of the present invention, the adaptive sliding module includes a drive assembly, a slide rail, a connecting rod and a roller; the connecting rod is passed through the bottom of the support coupling module, the roller is sleeved on the connecting rod, and one end of the connecting rod is axially connected to the drive assembly; the slide rail is mounted on the top of the sludge storage hopper and spans the sludge selection area, and the drive assembly drives the roller to move along the slide rail.

[0011] As a further solution of the present invention, the sludge selection area also includes a sludge concentration detection module, which is communicatively connected to the high-throughput horizontal tube sedimentation and separation device. The sludge concentration detection module is used to detect the sludge concentration in the sludge storage hopper and generate a sludge concentration signal to feed back to the control system to control the position of the high-throughput horizontal tube sedimentation and separation device.

[0012] As a further solution of the present invention, the drive assembly includes a drive motor, a transmission chain and a gear. The drive motor is fixedly arranged, the gear shaft is connected to the end of the connecting rod, and the gear is connected to the output end of the drive motor through the transmission chain.

[0013] As a further solution of the present invention, the water inlet area includes a water inlet pipe, the outflow end of the water inlet pipe is connected to a water distribution wall, and the water inlet area and the sludge selection area are connected through the water distribution wall.

[0014] As a further solution of the present invention, a reflux valve is provided on the sludge reflux pipe.

[0015] As a further solution of the present invention, a mud discharge valve is provided on the mud discharge pipe.

[0016] As a further solution of the present invention, the mud discharge method of the mud discharge area is a bucket-type gravity mud discharge method.

[0017] Beneficial effects of the present invention:

[0018] (1) The high-load activated sludge screening sedimentation tank disclosed in the present invention is equipped with an inlet area, a sludge selection area, a high-efficiency sedimentation area and an outlet area in sequence, so that sludge sedimentation and separation can be carried out simultaneously, which can well achieve mud-water separation. At the same time, it has the function of screening activated sludge, returning activated sludge with good properties and discharging sludge with poor properties, which greatly improves the pollutant removal efficiency of the front-end biochemical stage.

[0019] (2) The high-load activated sludge screening sedimentation tank disclosed in the present invention performs mobile screening of activated sludge with good properties by setting a high-throughput horizontal tube sedimentation separation device, an adaptive sliding module, a sludge concentration detection module and a support coupling module in the sludge selection area. By detecting the influent sludge concentration, the position of the high-throughput horizontal tube sedimentation separation device is automatically adjusted to achieve the best activated sludge settling efficiency and achieve high-load performance as a whole. It has an intelligent activated sludge screening function and can perform intelligent screening based on comprehensive judgments such as sludge density, floc particle size and sedimentation area, and complete sludge return. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of a high-load activated sludge screening sedimentation tank proposed by the present invention;

[0022] Figure 2 This is a top view of a high-load activated sludge screening sedimentation tank proposed by the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the sludge selection area of ​​a high-load activated sludge screening sedimentation tank proposed by the present invention;

[0024] Figure 4 It is an enlarged structural schematic diagram of point A of the sludge selection zone of a high-load activated sludge screening sedimentation tank proposed in the present invention.

[0025] In the figure: 10, tank body; 1, water inlet area; 101, water inlet pipe; 102, water distribution wall; 2, sludge selection area; 201, high-throughput horizontal tube sedimentation and separation device; 202, adaptive sliding module; 213, gear; 22, slide rail; 23, roller; 24, connecting rod; 203, support coupling module; 3, high-efficiency sedimentation area; 4, sludge discharge area; 401, sludge discharge hopper; 402, sludge discharge valve; 403, sludge discharge pipe; 404, sludge return pipe; 405, return valve; 406, sludge return pump; 407, sludge external discharge pump; 408, sludge storage hopper; 5, water outlet area; 501, water outlet pipe. DETAILED DESCRIPTION

[0026] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention, in conjunction with the accompanying drawings. It should be noted that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without inventive effort are within the scope of protection of the present invention. In the description of the present invention, it should be understood that the terms "upper," "lower," "left," "right," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for the purpose of facilitating and simplifying the description of the present invention. They do not indicate or imply that the devices or components referred to must have specific orientations, structures, or operations. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and should not be construed to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features designated "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0027] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0028] like Figure 1-4 As shown, a high-load activated sludge screening sedimentation tank includes a tank body 10, a sludge discharge area 4 is provided at the bottom of the tank body 10, and an inlet area 1, a sludge selection area 2, a high-efficiency sedimentation area 3 and an outlet area 5 are provided above the sludge discharge area 4 in sequence along the water flow direction. The inlet area 1 is connected to the sludge selection area 2, the high-efficiency sedimentation area 3 is provided at the rear end of the sludge selection area 2, and the right side of the high-efficiency sedimentation area 3 is connected to the outlet area 5;

[0029] The water inlet area 1 includes a water inlet pipe 101 and a water distribution wall 102. The water inlet area 1 is connected to the sludge selection area 2 through the water distribution wall 102. The mud-water mixture flowing in from the water inlet pipe 101 enters the sludge selection area 2 through the water distribution wall 102. By setting the water distribution wall 102, the mud-water mixture can be evenly introduced into the sludge selection area 2, avoiding the problem of blockage caused by sludge deposition and the reduction of screening efficiency. The water outlet area 5 is provided with a water outlet pipe 501. The mud-water mixture after screening and sedimentation enters the next treatment process through the water outlet pipe 501.

[0030] The sludge selection area 2 is provided with a high-throughput horizontal tube sedimentation separation device 201. The high-throughput horizontal tube sedimentation separation device 201 carries the activated sludge from the sludge selection area 2 to the high-efficiency sedimentation area 3. A support coupling module 203 is installed at the bottom of the high-throughput horizontal tube sedimentation separation device 201. When the high-throughput horizontal tube sedimentation separation device 201 is moving, the support coupling module 203 is used to position and fix the high-throughput horizontal tube sedimentation separation device 201. The high-throughput horizontal tube sedimentation separation device 201 is moved by the sludge selection area 2 to the high-efficiency sedimentation area 3. The high-throughput horizontal tube sedimentation separation device 201 adopts a two-stage horizontal tube sedimentation separation device. The first-stage horizontal tube sedimentation separation device is used for the activated sludge screening in the sludge selection zone 2, mainly for screening the activated sludge with good properties. It is driven by the adaptive sliding module 202 to move and screen, and the screened sludge enters the sludge storage bucket 408 for sludge return; the second-stage horizontal tube sedimentation separation device is used for sludge sedimentation in the high-efficiency sedimentation zone 3, mainly for settling the residual sludge with poor properties into the sludge discharge bucket 401 and discharging it.

[0031] The mud-water mixture enters the sludge selection area 2 through the water distribution wall 102. The sludge concentration range is fed back by the sludge concentration detection module. The driving motor drives the high-throughput horizontal tube sedimentation and separation device 201 to move horizontally in the sludge selection area 2. The sludge characteristics in the mud hoppers at the bottom of the water inlet area 1 and the high-throughput horizontal tube sedimentation and separation device 201 are good, and the sludge is returned. The sludge in the mud hoppers of the high-efficiency sedimentation area 3 and the water outlet area 5 is directly discharged; according to the sludge characteristics and concentration, the position of the high-throughput horizontal tube sedimentation and separation device 201 is adjusted, and the mud-water mixture passes through the sludge selection area 2 and enters the high-efficiency sedimentation area 3 for sedimentation, and finally enters the next link through the water outlet area 5.

[0032] The adaptive sliding module 202 includes a drive assembly, a slide rail 22, a roller 23, and a connecting rod 24. The connecting rod 24 is rotatably installed on the bottom of the support coupling module 203. The bottom of the support coupling module 203 is provided with a plurality of evenly arranged limiting holes. The connecting rod 24 is sleeved with rollers 23 at positions corresponding to the limiting holes. The rollers 23 are rotatably installed on the slide rail 22. One end of the connecting rod 24 is in transmission connection with the drive assembly.

[0033] The driving assembly includes a driving motor, a transmission chain and a gear 213. One end of the connecting rod 24 is connected to the gear 213. The gear 213 is connected to the output shaft of the driving motor through the transmission chain. The driving motor is fixedly installed on the top surface of the high-throughput horizontal tube sedimentation separation device 201. The driving motor is a variable frequency motor. By adjusting the forward and reverse rotation of the driving motor, the high-throughput horizontal tube sedimentation separation device 201 can be reciprocated along the slide rail 22; the driving motor speed is adjustable. By adjusting the driving motor speed, the time for the high-throughput horizontal tube sedimentation separation device 201 to pass through each sludge storage bucket 408 in the sludge selection area 2 can be adjusted, so that the high-throughput horizontal tube sedimentation separation device 201 can screen the sludge more accurately. By adjusting the driving motor speed, high-concentration activated sludge can be quickly sedimented, the return efficiency of the sludge with better activity can be improved, the overall high-load operation can be achieved, and the sedimentation tank can achieve high-throughput processing capacity.

[0034] The sludge discharge area 4 is provided with a number of evenly arranged sludge discharge buckets 401 and sludge storage buckets 408. The sludge discharge area 4 located below the sludge selection area 2 is equipped with a sludge storage bucket 408. The bottom of the sludge storage bucket 408 is connected to the inflow end of the sludge return pipe 404. The outflow end of the sludge return pipe 404 is connected to the sludge return pump 406. The sludge return pipe 404 is equipped with a reflux valve 405. The reflux valve 405 can be selected according to the position of the high-throughput horizontal pipe sedimentation separation device 201. The mud discharge area 4 located below the high-efficiency sedimentation area 3 is equipped with a mud discharge bucket 401. The bottom of the mud discharge bucket 401 is connected to the inflow end of the mud discharge pipe 403. The outflow end of the mud discharge pipe 403 is connected to the sludge external discharge pump 407. A mud discharge valve 402 is installed on the mud discharge pipe 403. The mud discharge valve 402 can be opened selectively by judging the sludge age through the control system. One or more valves can be opened each time to accurately discharge the mud in the mud discharge bucket 401, which is beneficial to reduce the waste of self-consumption water.

[0035] Since the sludge in the water inlet area 1 and the sludge selection area 2 has good activity, a sludge return pump 406 is used to return the sludge. The remaining sludge in the high-efficiency sedimentation area 3 and the water outlet area 5 is sludge with poor properties and needs to be precipitated and discharged. Therefore, a sludge external discharge pump 407 is used to discharge the sludge sediment; the sludge discharge area 4 adopts a bucket gravity sludge discharge method. The sludge storage bucket 408 and the sludge discharge bucket 401 are both V-shaped bucket structures. The sludge in the bucket relies on its own gravity and fluidity to be discharged from the bottom of the bucket.

[0036] A slide rail 22 is installed on the top of the sludge storage hopper 408, and the length of the slide rail 22 spans the sludge selection area 2. A sludge concentration detection module is installed in the sludge storage hopper 408, and the sludge concentration detection module is connected to the control system of the high-throughput horizontal tube sedimentation separation device 201. The sludge concentration detection module is used to detect the sludge concentration in the sludge storage hopper 408 and generate a sludge concentration signal. The sludge concentration detection module feeds back the generated sludge concentration signal to the control system of the high-throughput horizontal tube sedimentation separation device 201. The control system of the high-throughput horizontal tube sedimentation separation device 201 is based on The sludge concentration moves at an appropriate speed along the slide rail 22, ensuring that the high-throughput horizontal tube sedimentation separation device 201 is more fully screened when passing through the sludge storage bucket 408. During the movement of the high-throughput horizontal tube sedimentation separation device 201, the high-throughput horizontal tube sedimentation separation device 201 is positioned and fixed by the support coupling module 203; sedimentation and separation are carried out simultaneously, which can well realize mud-water separation, and at the same time has the activated sludge screening function, returning activated sludge with good properties and discharging sludge with poor properties, which greatly improves the pollutant removal efficiency of the front-end biochemical stage.

[0037] The sludge concentration detection module includes a sludge concentration measuring probe set in the sludge storage hopper 408. The sludge concentration measuring probe is connected to the controller for communication. The sludge concentration in the sludge storage hopper 408 is detected by the sludge concentration detection module, providing accurate data for the mobile screening of the high-throughput horizontal tube sedimentation separation device 201. The sludge discharge hopper 401 and the sludge storage hopper 408 located in the sludge discharge area 4 are also equipped with a mud level detection device. When the sludge level in the hopper reaches a set value, the reflux valve 405 and the sludge discharge valve 402 can be automatically opened to reflux or discharge the sludge. It does not need to be turned on if the set value is not reached, and it will stop when it is lower than the set lower limit, which reduces human interference in the operation of the sedimentation tank and improves the degree of automation of the sedimentation tank. At the same time, it can also extend the service life of the equipment and save energy and reduce emissions. Through intelligent activated sludge screening, it can be screened intelligently and sludge return can be completed based on comprehensive judgments such as sludge density, floc particle size and sedimentation area. The sludge concentration of the influent is detected by the sludge concentration detection module, and the position of the first-stage horizontal tube sedimentation and separation device is automatically adjusted to achieve the best activated sludge settling efficiency and achieve high load performance as a whole.

[0038] The working principle of a high-load activated sludge screening sedimentation tank disclosed in the present invention is as follows:

[0039] The mud-water mixture enters the sludge selection area 2 through the water distribution wall 102. The sludge concentration range fed back by the sludge concentration detection module is used to drive the high-throughput horizontal tube sedimentation separation device 201 to move horizontally in the sludge selection area 2. The higher the sludge concentration, the further back the high-throughput horizontal tube sedimentation separation device 201 is moved. The mud-water mixture passing through the sludge selection area 2 enters the high-efficiency sedimentation area 3 for sedimentation, and finally enters the next link through the effluent area 5. Through intelligent activated sludge screening, intelligent screening can be performed based on comprehensive judgments such as sludge density, floc particle size, and sedimentation area, and sludge return can be completed.

[0040] The high-throughput horizontal tube sedimentation separation device 201 adopts a two-stage horizontal tube sedimentation separation device. The first-stage horizontal tube sedimentation separation device is mainly used to screen activated sludge with good properties and has a mobile screening function. The second-stage horizontal tube sedimentation separation device is mainly used to precipitate and discharge residual sludge with poor properties. The sludge concentration of the influent is detected by the sludge concentration detection module, and the position of the first-stage horizontal tube sedimentation separation device is automatically adjusted to achieve the best activated sludge settling efficiency and achieve high-load performance as a whole. Sedimentation and separation are carried out simultaneously, which can realize mud-water separation well. At the same time, it has the activated sludge screening function, returns activated sludge with good properties, and discharges sludge with poor properties, which greatly improves the pollutant removal efficiency in the front-end biochemical stage.

[0041] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A high-load activated sludge screening sedimentation tank, characterized in that: The invention comprises a tank body (10) and a horizontal pipe sedimentation separation device (201), wherein the tank body (10) is provided with an inlet area (1), a sludge selection area (2), a high-efficiency sedimentation area (3) and a water outlet area (5) connected in sequence, and a mud discharge area (4) is provided at the bottom of the tank body (10), and the mud discharge area (4) is connected to the inlet area (1), the sludge selection area (2), the high-efficiency sedimentation area (3) and the water outlet area (5) respectively; the horizontal pipe sedimentation separation device (201) is installed in the tank body (10), and ... horizontal pipe sedimentation separation device (201) and the horizontal pipe sedimentation separation device (201) is installed in The tube sedimentation separation device (201) moves back and forth between the sludge selection zone (2) and the high-efficiency sedimentation zone (3) to screen the sludge. The sludge discharge zone (4) connected to the water inlet zone (1) and the sludge selection zone (2) is provided with a sludge storage hopper (408), and the sludge storage hopper (408) is connected to a sludge return pump (406); the sludge discharge zone (4) connected to the water outlet zone (5) and the high-efficiency sedimentation zone (3) is provided with a sludge discharge hopper (401), and the sludge discharge hopper (401) is connected to a sludge discharge pump (407); The bottom of the horizontal tube sedimentation separation device (201) is connected to a support coupling module (203), and the support coupling module (203) is installed above the sludge storage hopper (408) for positioning and fixing the horizontal tube sedimentation separation device (201); The horizontal tube sedimentation separation device (201) moves back and forth from the sludge selection area (2) to the high-efficiency sedimentation area (3) via an adaptive sliding module (202); The adaptive sliding module (202) includes a driving assembly, a slide rail (22), a connecting rod (24) and a roller (23); the connecting rod (24) is arranged on the bottom of the supporting coupling module (203), the roller (23) is sleeved on the connecting rod (24), and one end of the connecting rod (24) is axially connected to the driving assembly; the slide rail (22) is mounted on the top of the sludge storage hopper (408) and spans the sludge selection area (2), and the driving assembly drives the roller (23) to move along the slide rail (22); The sludge selection area (2) also includes a sludge concentration detection module, which is in communication with the horizontal tube sedimentation separation device (201). The sludge concentration detection module is used to detect the sludge concentration in the sludge storage hopper (408) and generate a sludge concentration signal to feed back to the control system to control the position of the horizontal tube sedimentation separation device (201).

2. A high-load activated sludge screening sedimentation tank according to claim 1, characterized in that: The sludge selection zone (2) includes a sludge storage hopper (408), which is connected to the sludge return pump (406) via a sludge return pipe (404); a sludge discharge hopper (401) is provided at the bottom of the high-efficiency sedimentation zone (3), and the sludge discharge hopper (401) is connected to the sludge discharge pump (407) via a sludge discharge pipe (403).

3. A high-load activated sludge screening sedimentation tank according to claim 2, characterized in that: The driving assembly comprises a driving motor, a transmission chain and a gear (213); the driving motor is fixedly arranged; the gear (213) is axially connected to the end of the connecting rod (24); and the gear (213) is connected to the output end of the driving motor via the transmission chain.

4. A high-load activated sludge screening sedimentation tank according to claim 1, characterized in that: The water inlet area (1) comprises a water inlet pipe (101), the outflow end of the water inlet pipe (101) is connected to a water distribution wall (102), and the water inlet area (1) and the sludge selection area (2) are connected via the water distribution wall (102).

5. The high-load activated sludge screening sedimentation tank according to claim 1, characterized in that: The sludge return pipe (404) is provided with a return valve (405).

6. A high-load activated sludge screening sedimentation tank according to claim 1, characterized in that: The mud discharge pipe (403) is provided with a mud discharge valve (402).

7. The high-load activated sludge screening sedimentation tank according to claim 1, characterized in that: The mud discharge area (4) is provided with a bucket-type gravity mud discharge method.

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