Circumferential-in and circumferential-out radial-flow type superimposed sedimentation tank

Abstract

The invention provides a circumferential-in and circumferential-out radial-flow type superimposed sedimentation tank, and relates to the field of sewage treatment, the circumferential-in and circumferential-out radial-flow type superimposed sedimentation tank comprises a bottom plate and a tank wall arranged above the bottom plate, and the tank wall and the bottom plate form a tank body; an annular table is arranged above the pool wall, a water inlet groove and a water outlet groove are formed in the annular table, the water inlet groove is communicated with a sewage inlet, water distribution holes communicated with the pool body are formed in the bottom of the water inlet groove and are formed in the sewage flowing direction, and a water outlet communicated with the pool body is formed in the bottom of the water outlet groove; a water diversion groove is further formed in the annular table, clean water flows into the water diversion groove from the upper end of the water outlet groove, and the water diversion groove is provided with a clean water outlet. The annular grid device is arranged below the water outlet tank, the grid device and the tank wall are arranged at an interval, so that sewage directly enters the tank body, and the water outlet flow path is prolonged in a peripheral inlet and peripheral outlet manner, so that the retention time of the sewage in the tank body is longer, and floc particles in the sewage can be fully precipitated.

Description

Technical Field

[0001] The invention relates to the field of sewage treatment, and in particular to a radial flow superimposed sedimentation tank with a peripheral inlet and outlet. Background Art

[0002] The sedimentation tank after biological treatment is usually called the secondary sedimentation tank (referred to as the secondary sedimentation tank). The function of the secondary sedimentation tank is to separate mud and water, clarify the mixed liquor, concentrate the sludge and return the separated sludge to the biological treatment section. The sedimentation effect directly affects the SS of the effluent from the secondary sedimentation tank and the concentration of the returned sludge. In the activated sludge process, the mixed liquor flowing out of the aeration tank is separated from mud and water and the sludge is concentrated in the secondary sedimentation tank. The clarified effluent overflows and is discharged. Part of the concentrated activated sludge is returned to the aeration tank, and the rest is discharged as residual sludge. The sludge suction methods of the secondary sedimentation tank include the liquid level difference self-priming method, the siphon method, the pump lift method and a combination of the above methods.

[0003] At present, the commonly used secondary sedimentation tank is central inlet and peripheral outlet. Sewage enters from the center of the tank, and after sedimentation, purification and separation, the clean water is discharged from the peripheral direction of the secondary sedimentation tank. Since the sewage moves a short distance in the secondary sedimentation tank, the sludge discharge capacity and sewage treatment capacity of the secondary sedimentation tank are restricted.

[0004] To this end, the present application provides a radial flow superimposed sedimentation tank with a peripheral inlet and outlet to improve the sewage treatment capacity of the secondary sedimentation tank. Summary of the invention

[0005] The invention provides a radial flow superimposed sedimentation tank with circumferential inlet and outlet, which aims to solve the problem that the existing secondary sedimentation tank is inconvenient to transform and has poor sedimentation effect.

[0006] In order to achieve the above object, an embodiment of the present invention provides a radial flow superimposed sedimentation tank with a circumferential inlet and a circumferential outlet, comprising: A bottom plate and a pool wall arranged above the bottom plate, wherein the pool wall and the bottom plate form a pool body; A ring platform is also provided on the upper inner side of the pool wall, and a water inlet trough and a water outlet trough are provided on the ring platform in sequence from the outside to the inside. The water inlet trough is connected to the sewage inlet, and the sewage flows unidirectionally along the water inlet trough. A water distribution hole connected to the pool body is provided at the bottom of the water inlet trough, and the water distribution hole is provided along the direction of sewage flow. The water outlet connected to the pool body is provided at the bottom of the water outlet trough; The ring platform is also provided with a water distribution trough, and clean water flows into the water distribution trough from the upper end of the water outlet trough, and the water distribution trough is provided with a clean water outlet; The annular grid device is arranged below the water outlet trough, and the grid device is spaced apart from the pool wall so that sewage can directly enter the pool body. The grid device has an inclined mud-water separation channel.

[0007] Preferably, a mud discharge channel and a mud discharge port connecting the mud discharge channel and the pool body are provided in the bottom plate; The radial flow superimposed sedimentation tank with peripheral inlet and outlet also includes a sludge treatment unit, which is arranged at the center of the bottom plate. The sludge treatment unit includes a sludge suction part and a sludge scraping part, which revolve around the center of the bottom plate. The sludge suction part is connected to the sludge discharge port, and the sludge scraping part spreads the sludge on the bottom plate.

[0008] Preferably, a water stop plate is further provided in the water inlet trough, and the water stop plate is provided upstream of the sewage inlet; The radial flow superimposed sedimentation tank with peripheral inlet and outlet also includes a slag collecting unit, which includes a slag collecting bucket and a slag skimming assembly, and the slag collecting bucket is arranged on the inner side of the ring platform; A central column is also provided at the center of the bottom plate, and the sludge processing unit and the slag skimming assembly are rotatably arranged on the central column. The slag skimming assembly transfers the slag floating on the liquid surface into the slag collecting bucket.

[0009] Preferably, the slag collecting unit further comprises a slag well and a slag collecting pipe, wherein the slag collecting pipe is connected to the slag collecting bucket and the slag well; an outer wall is arranged on the periphery of the pool wall, and the outer wall and the pool wall form the slag well in the radial direction.

[0010] Preferably, the grid device includes a plurality of grid units, the grid units are spliced ​​to form the grid device, the grid device forms a first interval with the ring platform in the vertical direction, and forms a second interval with the pool wall in the horizontal direction, a water retaining plate is arranged in the second interval, the water retaining plate is arranged below the water distribution hole, and a water retaining skirt is arranged in the first interval, and the water retaining skirt is used to prevent sewage from entering the first interval.

[0011] Preferably, a water guide plate is further provided at one end of the ring platform away from the pool wall, and the water guide plate is used to guide the sewage impacting the ring platform to avoid the grid device and fall into the pool body.

[0012] Preferably, the grid device comprises a filling frame, and the filling frame is arranged with inclined tubes or inclined plates. When the filling frame is provided with inclined plates, adjacent inclined plates form the mud-water separation channel.

[0013] Preferably, the longitudinal section of the bottom plate is conical, and an emptying port is formed at the center of the bottom plate. The emptying port is connected to an emptying pipe arranged below the bottom plate, and the scraper part is attached to the bottom plate and rotates.

[0014] Preferably, the top ends of the mud suction part and the mud scraping part are spaced apart from the grid device in the vertical direction.

[0015] Preferably, the water outlet trough is arranged in the water sub-trough, and the water outlet trough radially divides the water sub-trough into a first water sub-trough and a second water sub-trough, the first water sub-trough and the second water sub-trough are connected, and the first water sub-trough or the second water sub-trough is connected to the clean water outlet.

[0016] The above scheme of the present invention has the following beneficial effects: First, the present application prolongs the outlet flow path by means of a circular inflow and outflow method, so that the sewage stays in the pool longer, the floc particles in the sewage can be fully precipitated, and the separation effect is better.

[0017] Second, this application can add water guide plates and grid devices on the basis of the ring platform to transform the old sedimentation tank, solving the problem that the existing sedimentation tank cannot be transformed due to construction land restrictions.

[0018] Third, the effluent flow path designed in this application can solve the problems of sludge leakage in the secondary sedimentation tank and poor effluent effect caused by changes in climate, water quality and quantity, lack of nutrients in the sludge, excessive ammonia nitrogen, mechanical reasons, deoxygenation, etc. during operation, and solve the problem of large footprint and low sedimentation load of conventional sedimentation tanks.

[0019] Fourthly, the annular grid device can not only ensure the filtering effect, but also reduce the cost of the grid device. At the same time, the grid device is assembled from multiple grid devices, and can be assembled according to different construction requirements, which is simple and practical.

[0020] Fifth, due to the limitation of the grid device, the Reynolds number of the water flow is reduced when the sewage flows through the grid device to the outlet tank, the turbulence of the water flow is reduced, the flow velocity is reduced, the floc particles are not easily broken, and the distribution of the water flow is more uniform. In addition, the grid device has an inclined mud-water separation channel, and the floc particles that slide down from the mud-water separation channel to the pool body are basically not affected by the horizontal force, so the sedimentation is more stable and the effect is better.

[0021] Sixth, the setting of the grid device makes the sludge settling area and the sedimentation area relatively independent, and the precipitated floc particles are not easily stirred, which reduces the water inlet load of the grid device, makes the effluent water quality better, and prolongs the cleaning cycle of the grid device.

[0022] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a top view of the present invention; Figure 2 is a schematic diagram of the grid device layout; Figure 3 yes Figure 1 Cross-sectional view of AA in the middle; Figure 4 yes Figure 1 Cross-section of the middle BB; Figure 5 yes Figure 1 Cross-section of the middle CC; Figure 6 yes Figure 1 Enlarged view of part D Figure 7 yes Figure 3 Enlarged view of part E in the middle; Figure 8 is a schematic diagram of a grid cell; Fig. 9 It is a schematic diagram of the water guide plate.

[0024] [Description of Reference Numerals] 100-bottom plate, 110-mud discharge port, 120-drainage port, 130-mud discharge channel, 131-drainage pipe 200-pool wall, 300-ring platform, 310-water inlet, 311-sewage inlet, 312-water distribution hole, 313-water stop plate, 314-slag hopper, 315-water retaining plate, 316-water retaining skirt plate, 317-water guide plate, 318-slag outlet, 320-water outlet, 321-water outlet, 330-water distribution tank, 331-clean water outlet, 332-first water distribution tank, 333-second water distribution tank, 334-outlet cofferdam, 335-water distribution cofferdam, 400-grid device, 410-mud-water separation channel, 420-filling rack, 421-inclined plate, 500-sludge treatment unit, 510-sludge suction unit, 520-sludge scraping unit, 600-center column, 610-slag skimmer assembly, 700-exterior wall, 710-slag well, 720-slag collection pipe, S-Flow path of the first sewage. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1-9 As shown, an embodiment of the present invention provides a radial flow superimposed sedimentation tank with a circumferential inlet and outlet, comprising a bottom plate 100 and a tank wall 200, wherein the bottom plate 100 and the tank wall 200 are both circular, the tank wall 200 is arranged on the bottom plate 100, and the tank wall 200 and the bottom plate form a tank body. A mud discharge channel 130 and a mud discharge port 110 are arranged in the bottom plate 100, and the mud discharge port 110 is connected to the mud discharge channel 130 for discharging the precipitated sludge out of the tank body.

[0027] A ring platform 300 is also provided on the inner side of the pool wall 200, and the ring platform 300 is provided above the pool wall 200. A water inlet trough 310 and a water outlet trough 320 are provided on the ring platform 300, wherein the water inlet trough 310 and the water outlet trough 320 are provided concentrically with the bottom plate 100, and the diameter of the water inlet trough 310 is larger than the diameter of the water outlet trough 320. A sewage inlet 311 is provided on the water inlet trough 310, and the sewage enters the water inlet trough 310 through the sewage pipe, and flows unidirectionally along the water inlet trough 310. A water distribution hole 312 is also provided at the bottom of the water inlet trough 310, and a plurality of water distribution holes 312 are provided, and the water distribution holes 312 are provided along the flow direction of the sewage. In the present application, the sewage flows counterclockwise in the water inlet trough 310. After entering the water inlet trough 310, the sewage enters the pool body through the water distribution holes 312. It should be noted that, since the water distribution holes 312 are arranged along the flow path of the sewage, as the sewage flows, the flow rate of the upstream water distribution holes 312 will be greater than that of the downstream water distribution holes 312.

[0028] A water outlet 321 is disposed at the bottom of the water outlet trough 320 , and the water outlet 321 communicates with the water outlet trough 320 and the pool body.

[0029] A water distribution tank 330 is also provided on the ring platform 300 , and a clean water outlet 331 is provided in the water distribution tank 330 .

[0030] Preferably, a water outlet pit is provided at the bottom of the water diversion tank 330, and the clean water outlet 331 is provided on the water outlet pit.

[0031] An annular grid device 400 is also provided in the pool body, and the grid device 400 is provided below the water outlet trough 320, and the grid device 400 is spaced apart from the pool wall 200. The grid device 400 has an inclined mud-water separation channel 410, and the floc particles flowing up with the sewage adhere to the mud-water separation channel 410 to form relatively large mud particles, which sink due to gravity, thereby achieving the effect of mud-water separation.

[0032] When sewage enters the water inlet trough 310, it enters the tank body through the circumferentially arranged water distribution holes 312 at a certain initial velocity. The sewage flows toward the center of the tank body along a preset path in the tank body. In the process of flowing toward the center of the tank body, the floc particles in the sewage are separated from the clean water, wherein the floc particles sink to the bottom plate 100 to form sludge, completing the first sedimentation. The sewage flowing through the multiple water distribution holes 312 turns back at the center of the tank body and flows toward the tank wall 200 away from the center of the tank body. As the amount of returned sewage increases, the liquid level of the sewage gradually rises, and the sewage overflows the grid device 400 from the bottom of the grid device 400. Under the action of the grid device 400, after the mud and water separation and sedimentation are completed, it enters the water outlet trough 320 through the circumferentially arranged water outlet 321.

[0033] In the present application, the water distribution hole 312 and the water outlet 321 are both arranged in the circumference of the center of the pool body. The sewage enters from the water distribution hole 312, and flows out from the water outlet 321 after returning to the center of the pool body, achieving the purpose of circular in and circular out. Compared with the conventional middle-in and circular out or circular-in and middle-out method, the flow path of the sewage in the sedimentation tank is extended during the circular in and circular out process, which is twice the flow path in the middle-in and circular out or circular-in and middle-out method, so that the sewage stays in the sedimentation tank for a longer time and the first sedimentation effect is better. In addition, a grid device 400 with a mud-water separation channel 410 is provided in the present application, so that the returned sewage can only overflow upward from the bottom of the mud-water separation channel 410, avoiding the returned sewage being directly discharged from the water outlet 321, causing the discharged clean water to fail to meet the standards. In addition, when the returned sewage passes through the mud-water separation channel 410, the Reynolds number of the water flow is reduced, the turbulence of the water flow is reduced, the flow velocity is reduced, and the floc particles are not easily broken, making it easier for the floc particles to attract each other and combine together to complete the second sedimentation. Below the grid device 400 is the mud settling area, and below the mud settling area is the sedimentation area. The floc particles and water in the sewage are separated below the grid device 400, and the floc particles combine with each other in the mud settling area to form sludge, and finally settle in the sedimentation area.

[0034] Furthermore, as the floc particles accumulate, a large amount of sludge is formed in the sedimentation area, so it is necessary to clean the sludge in the sedimentation area. To this end, the present application also includes a sludge treatment unit 500, which is arranged at the center of the bottom plate 100. The sludge treatment unit 500 includes a sludge suction part 510 and a sludge scraping part 520, wherein the sludge suction part 510 and the sludge scraping part 520 both revolve around the center of the bottom plate 100, wherein the sludge suction part 510 is connected to the sludge discharge port 110, and the sludge scraping part 520 spreads and evenly distributes the sludge, making it convenient for the sludge suction part 510 to suck.

[0035] Preferably, the center of the bottom plate 100 is lower than the edge of the bottom plate 100, so that the bottom plate 100 is conical in the longitudinal section. As the scraping part 520 scrapes, the sludge moves along the bottom plate 100 from the edge of the bottom plate 100 to the center of the bottom plate 100. An emptying port 120 is provided at the center of the bottom plate 100, and the emptying port 120 is connected to an emptying pipe provided below the bottom plate 100.

[0036] Preferably, the aforementioned mud scraping part 520 is attached to the bottom plate 100 and rotates.

[0037] A water stop plate 313 is further disposed in the water inlet groove 310 , and the water stop plate 313 is disposed upstream of the sewage inlet 311 .

[0038] Reference Figure 6As shown, when the sewage flows counterclockwise and enters the downstream of the water inlet trough 310, the water stop plate 313 is set on the clockwise side of the sewage inlet 311, that is, the sewage flows in the counterclockwise direction in the water inlet trough 310, and the central angle corresponding to the flow path is smaller than the circumferential angle.

[0039] Similarly, when the sewage flows in a clockwise direction, the water stop plate 313 is arranged in the counterclockwise direction of the sewage inlet 311, and the central angle corresponding to the flow path of the sewage is also smaller than the circumferential angle.

[0040] Preferably, the width of the water inlet trough 310 gradually decreases along the flow direction. The purpose of gradually decreasing the width is to ensure that the sewage still has kinetic energy to flow to the last water distribution hole 312 after flowing through each water distribution hole 312, so as to prepare for subsequent treatment and cleaning of scum.

[0041] The present application also includes a slag collecting unit, which is used to collect scum floating on the liquid surface, and the scum is usually floating matter such as oily substances and algae.

[0042] The slag collecting unit includes a slag collecting bucket 314 and a slag skimming assembly 610. The slag collecting bucket 314 is arranged on the inner side of the ring platform 300, and the slag skimming assembly 610 is arranged at the center of the pool body. The slag skimming assembly 610 rotates with the center of the pool body as the rotation point, thereby transferring the floating slag in the area around the ring platform 300 into the slag collecting bucket 314 for collection.

[0043] Furthermore, the slag collecting unit further includes a slag discharge port 318 for collecting slag in the water inlet tank 310, and the slag discharge port 318 is arranged in the water inlet tank 310 near the water stop plate 313. The slag discharge port 318 and the sewage inlet port 311 are respectively arranged on both sides of the water stop plate 313. As the sewage flows, the sewage carries the slag to the slag discharge port 318 and is discharged from the water inlet tank 310 through the slag discharge port 318.

[0044] In order to facilitate the collection of slag from the slag discharge port 318 and the slag collecting hopper 314, an outer wall 700 is also provided on the outer side of the pool wall 200, and the outer wall 700 and the pool wall 200 form a slag well 710 in the radial direction, wherein the slag collecting hopper 314 and the slag well 710 are connected through a slag collecting pipe 720, and the water inlet trough 310 and the slag well 710 are connected through the slag discharge port 318.

[0045] Furthermore, in order to support and install the sludge treatment unit 500 and the skimming assembly 610, a central column 600 is also arranged at the center of the pool body. The aforementioned sludge treatment unit 500 is arranged at the lower part of the central column 600, and the scraping part 520 and the mud suction part 510 are respectively rotatably arranged on the central column 600. Preferably, the scraping part 520 and the mud suction part 510 are arranged on the central column 600 in a centrally symmetrical manner.

[0046] Similarly, the skimming unit is rotatably disposed on the upper portion of the central column 600 .

[0047] Preferably, the drain port 120 and the mud discharge port 110 are disposed at the central column 600 .

[0048] The aforementioned grid device 400 and the ring platform 300 are arranged at intervals in the vertical direction to form a first interval, and the grid device 400 and the pool wall 200 are arranged at intervals in the horizontal direction to form a second interval. When sewage is discharged from the water distribution hole 312, the sewage flows out from the second interval without flowing through the grid device 400. A horizontal water retaining plate 315 is arranged in the second interval. The water retaining plate 315 is arranged below the water distribution hole 312. When each water distribution hole 312 discharges water, the sewage acts on the water retaining plate 315. On the one hand, it prevents the sewage from rushing down directly and cannot move along the preset path, causing the sewage separation and sedimentation path to become shorter, affecting the sewage separation and sedimentation effect. On the other hand, the water retaining plate 315 can accumulate the floc particles in the sewage, causing the floc particles to agglomerate, which is convenient for the subsequent separation of the agglomerated floc particles. A longitudinal water retaining skirt 316 is arranged in the first compartment. The water retaining skirt 316 is arranged in a ring shape at the bottom of the ring platform 300 and closes the first compartment to prevent sewage from entering the first compartment and depositing sludge in the first compartment, thereby clogging the grid device 400.

[0049] A water guide plate 317 is also provided on the side of the ring platform 300 away from the pool wall 200. When sewage enters the pool body and turns toward the water outlet 321, part of the sewage will impact the grid device 400 and enter the first interval. On the one hand, the floc particles in the sewage gradually settle on the grid device 400, causing the grid device 400 to be blocked, and on the other hand, it prevents unsettled sewage from entering the water outlet 321. For this reason, a water guide plate 317 is provided on the ring platform 300, and the water guide plate 317 covers the grid device 400, so that the sewage acts on the water guide plate 317, and the sewage avoids the grid device 400 and falls into the pool body through the water guide plate 317.

[0050] By using the water guide plate 317, all the sewage is guided to the bottom of the grid device 400, so that the sewage overflows upward from the bottom of the mud-water separation channel 410, and is separated into sewage and clean water, wherein the clean water enters the water outlet 321, and the sludge sinks to the bottom, reducing the sewage containing tiny flocs directly flowing into the water outlet 321.

[0051] In this embodiment, the water guide plate 317 is a bent plate body, the top of the water guide plate 317 is fixed on the ring platform 300, and the lower end is covered on the grid device 400. Several water guide plates 317 are arranged in a ring shape, and the water guide plates 317 block the first interval, thereby preventing sewage from entering the first interval.

[0052] The grid device 400 is assembled by connecting a number of fan-shaped grid units end to end. The grid device 400 is annular as a whole, and each grid unit includes a filling frame 420. The filling frame 420 is fixed to the pool wall 200 and the ring platform 300 by interlacing steel wire ropes. A rope tightener is provided between each steel wire rope and the anchor hook connected to the pool wall 200 and the ring platform 300 to tighten the steel wire rope. The filling frame 420 is composed of two layers of horizontal trusses.

[0053] A mud-water separation channel 410 is formed on the filling frame 420 . The mud-water separation channel 410 forms an angle with the vertical direction. In some embodiments of the present application, a plurality of inclined tubes are arranged on the filling frame 420 , and the inclined tubes form the mud-water separation channel 410 .

[0054] In other embodiments of the present application, a plurality of parallel inclined plates 421 are provided on the filling frame 420, and the aforementioned mud-water separation channel 410 is formed between adjacent inclined plates 421. In this embodiment, the inclined plates 421 can be flat plates or corrugated plates.

[0055] The top ends of the aforementioned mud suction part 510 and the mud scraping part 520 are spaced apart from the grid device 400 in the vertical direction to prevent the mud suction part 510 and the mud scraping part 520 from being interfered by the grid device 400 .

[0056] The aforementioned water outlet trough 320 is arranged in the water dividing trough 330, and the water outlet trough 320 radially divides the water dividing trough 330 into a first water dividing trough 332 and a second water dividing trough 333. The first water dividing trough 332 and the second water dividing trough 333 are respectively located on both sides of the water outlet trough 320. A plurality of water outlet troughs 320 are arranged in a ring array in the water dividing trough 330, and adjacent water outlet troughs 320 are spaced apart, thereby ensuring that the first water dividing trough 332 and the second water dividing trough 333 are connected at the interval of the water outlet trough 320. The water outlet cofferdam 334 forming the water outlet trough 320 is lower than the water diversion cofferdam 335 forming the water diversion trough 330. Therefore, when the clean water overflows from the water outlet 321, it will first fill the water outlet trough 320. When the water outlet trough 320 is filled with clean water, the clean water that has completed the separation of mud and water flows along the water outlet cofferdam 334 into the first water diversion trough 332 and the second water diversion trough 333. At this time, the liquid level of the clean water is lower than the water diversion cofferdam 335.

[0057] When the present application is working, sewage enters the water inlet trough 310 from the sewage inlet 311, and the sewage flows counterclockwise in the water inlet trough 310. Since the water distribution hole 312 is set at the bottom of the water inlet trough 310, a part of the sewage enters the water distribution hole 312 to form the first sewage, and the first sewage falls into the pool body, and the other part of the sewage continues to flow counterclockwise until it flows to the water stop plate 313.

[0058] When the first sewage falls into the tank body through the water distribution hole 312, it is affected by the water retaining plate 315 and the water retaining skirt 316. After passing through the water retaining plate 315, the first sewage enters the tank body and flows toward the center of the tank body. Since the water distribution holes 312 are arranged in a ring shape, the first sewage at various positions collides at the center of the tank body, and the first sewage turns back toward the grid device 400. In the process of the first sewage flowing toward the center of the tank body and turning back, the floc particles in the sludge are separated and clarified in the sludge settling area below the grid device 400, and the falling floc particles are precipitated in the sedimentation area below the sludge settling area to form sludge.

[0059] During the first sewage return process, it falls under the grid device 400, but a part of the first sewage still acts on the water guide plate 317, and the water guide plate 317 relieves the impact of the first sewage and allows the first sewage to fall into the pool body. Obviously, the first sewage increases the flow path length by returning, making it easier to separate the floc particles in the sewage, and the floc particles sink to form sludge, completing the first precipitation of the first sewage. As the first sewage falls into the pool body, the liquid level in the pool body gradually increases, and the first sewage passes through the grid device 400 and is separated from mud and water again under the action of the grid device 400 to complete the second precipitation. After the second precipitation, the first sewage becomes clean water, and the clean water passes through the grid device 400 from bottom to top into the water outlet 320. When the water outlet 320 is full of clean water, it turns over to the first water outlet 332 and the second water outlet 333, and the clean water in the first water outlet 332 and the second water outlet 333 is discharged through the clean water outlet 331. Based on the design and layout of the present application, the first sewage can flow along the flow path S of the first sewage.

[0060] During the process of clarifying and settling the first sewage, the first sewage includes floc particles and scum, wherein the scum is lighter and floats on the liquid surface inside the ring platform 300. The scum skimming assembly 610 rotates around the center of the tank body on the liquid surface, thereby sweeping the scum floating on the liquid surface into the scum collecting hopper 314 fixed on the inner side of the ring platform 300.

[0061] The floc particles are precipitated in the precipitation area under the action of gravity to form sludge, and the sludge scraper 520 spreads and evenly distributes the sludge settled on the bottom plate 100. The sludge suction unit 510 sucks the sludge after the sludge is flattened and concentrated into the sludge discharge channel 130.

[0062] As the second sewage flows counterclockwise, the flow rate of the second sewage becomes smaller and smaller due to the water leakage of the water distribution hole 312. When the second sewage flows near the water stop plate 313, a slag discharge port 318 is provided at the water stop plate 313, and the floating slag is discharged into the water tank 310 at the slag discharge port 318.

[0063] The slag discharge port 318 and the slag collecting hopper 314 are respectively connected to the slag well 710 for temporarily storing slag.

[0064] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A radial flow superimposed sedimentation tank with circumferential inlet and outlet, characterized in that: include: A bottom plate (100) and a pool wall (200) arranged above the bottom plate (100), wherein the pool wall (200) and the bottom plate (100) form a pool body; A ring platform (300) is further provided on the upper inner side of the pool wall (200), and a water inlet groove (310) and a water outlet groove (320) are provided on the ring platform (300) in sequence from the outside to the inside, the water inlet groove (310) is connected to a sewage inlet (311), and sewage flows unidirectionally along the water inlet groove (310), a water distribution hole (312) connected to the pool body is provided at the bottom of the water inlet groove (310), and the water distribution hole (312) is provided along the flow direction of the sewage, and a water outlet (321) connected to the pool body is provided at the bottom of the water outlet groove (320); A water distribution trough (330) is also provided on the ring platform (300), and clean water flows into the water distribution trough (330) from the upper end of the water outlet trough (320). The water distribution trough (330) is provided with a clean water outlet (331); The annular grid device (400) is arranged below the water outlet trough (320), and the grid device (400) is spaced apart from the pool wall (200) so that sewage can directly enter the pool body. The grid device (400) has an inclined mud-water separation channel (410).

2. The radial flow superimposed sedimentation tank with circumferential inlet and outlet according to claim 1 is characterized in that: The bottom plate (100) is provided with a mud discharge channel (130) and a mud discharge port (110) communicating with the mud discharge channel (130) and the tank body; The radial flow superimposed sedimentation tank with circumferential inlet and outlet further comprises a sludge treatment unit (500), the sludge treatment unit (500) being arranged at the center of the bottom plate (100), the sludge treatment unit (500) comprising a sludge suction part (510) and a sludge scraping part (520), the sludge suction part (510) and the sludge scraping part (520) revolving around the center of the bottom plate (100), the sludge suction part (510) being connected to the sludge discharge port (110), and the sludge scraping part (520) spreading the sludge on the bottom plate (100).

3. The radial flow superimposed sedimentation tank with circumferential inlet and outlet according to claim 2 is characterized in that: A water stop plate (313) is also provided in the water inlet groove (310), and the water stop plate (313) is provided upstream of the sewage inlet (311); The radial flow superimposed sedimentation tank with a circumferential inlet and outlet further comprises a slag collection unit, which comprises a slag collection hopper (314) and a slag skimming assembly (610), wherein the slag collection hopper (314) is arranged on the inner side of the annular platform (300); A central column (600) is also provided at the center of the bottom plate (100), and the sludge treatment unit (500) and the slag skimming assembly (610) are rotatably arranged on the central column (600), and the slag skimming assembly (610) pushes the slag floating on the liquid surface into the slag collecting bucket (314).

4. The radial flow superimposed sedimentation tank with circumferential inlet and outlet according to claim 3 is characterized in that: The slag collecting unit further comprises a slag well (710) and a slag collecting pipe (720), wherein the slag collecting pipe (720) is connected to the slag collecting bucket (314) and the slag well (710); an outer wall (700) is arranged on the periphery of the pool wall (200), and the outer wall (700) and the pool wall (200) form the slag well (710) in a radial direction.

5. The radial flow superimposed sedimentation tank with circumferential inlet and outlet according to claim 1 is characterized in that: The grid device (400) comprises a plurality of grid units, the grid units are spliced ​​to form the grid device (400), the grid device (400) forms a first interval with the ring platform (300) in the vertical direction, and forms a second interval with the pool wall (200) in the horizontal direction, a water retaining plate (315) is arranged in the second interval, the water retaining plate (315) is arranged below the water distribution hole (312), and a water retaining skirt plate (316) is arranged in the first interval, the water retaining skirt plate (316) is used to prevent sewage from entering the first interval.

6. The radial flow superimposed sedimentation tank with circumferential inlet and outlet according to claim 5 is characterized in that: A water guide plate (317) is further provided at one end of the ring platform (300) away from the pool wall (200), and the water guide plate (317) is used to guide the sewage impacting the ring platform (300) to avoid the grid device (400) and fall into the pool body.

7. The radial flow superimposed sedimentation tank with circumferential inlet and outlet according to claim 1 is characterized in that: The grid device (400) comprises a filling frame (420), wherein the filling frame (420) is arranged with inclined tubes or inclined plates (421); when the filling frame (420) is provided with inclined plates (421), adjacent inclined plates (421) form the mud-water separation channel (410).

8. The radial flow superimposed sedimentation tank with circumferential inlet and outlet according to claim 2 is characterized in that: The bottom plate (100) has a conical longitudinal section, and an emptying port (120) is formed at the center of the bottom plate (100). The emptying port (120) is connected to an emptying pipe (131) provided below the bottom plate (100), and the mud scraping portion (520) is attached to the bottom plate (100) and rotates.

9. The radial flow superimposed sedimentation tank with circumferential inlet and outlet according to claim 2 is characterized in that: The top ends of the mud suction part (510) and the mud scraping part (520) are spaced apart from the grid device (400) in the vertical direction.

10. The radial flow superimposed sedimentation tank with circumferential inlet and outlet according to claim 1, characterized in that: The water outlet trough (320) is arranged in the water branch trough (330), and the water outlet trough (320) divides the water branch trough (330) into a first water branch trough (332) and a second water branch trough (333) in a radial direction; the first water branch trough (332) and the second water branch trough (333) are connected; and the first water branch trough (332) or the second water branch trough (333) is connected to the clean water outlet (331).

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