Multifunctional sedimentation tank based on hetero-wave folded plate and operation method thereof

Abstract

The application discloses a multifunctional sedimentation tank based on an asymmetrically folded plate and an operation method thereof. The device comprises a sedimentation tank body, which is divided into an upper tank body and a lower tank body by a middle transverse partition plate. The lower tank body is an emergency tank unit. The left chamber of the upper tank body is a sludge discharge main channel. The right chamber is sequentially provided with a water inlet unit, a folded plate sedimentation unit and a water outlet unit from front to back. A scum main groove and a water inlet main channel flushing groove are arranged on the outer wall of the right chamber in an up-down interval. The water outlet of the water inlet unit is connected with the water inlet of the folded plate sedimentation unit. The water outlet of the folded plate sedimentation unit is connected with the water outlet unit. The water inlet unit is connected with the emergency tank unit. The water outlet unit is connected with the sludge discharge main channel, the scum main groove and the water inlet main channel flushing groove respectively. The water outlet of the water inlet main channel flushing groove is connected with the cleaning water inlet of the water inlet unit. The cleaning water outlet of the water inlet unit is connected with the sludge discharge main channel. The device and the method greatly improve the sedimentation efficiency and meet the switching operation of various working conditions.

Description

Technical Field

[0001] This invention relates to sedimentation tanks, and more particularly to sedimentation tanks for wastewater treatment. Background Technology

[0002] Various factors during urban construction lead to the accumulation of large amounts of impurities in stormwater and sewage pipe networks, such as silt, garbage, oil, suspended solids, particulate matter, organic matter, and heavy metals. Adding a pretreatment stage after the pipe network is crucial for water treatment plants and wastewater discharge. Existing water treatment plants commonly use sedimentation tanks with the following structures: horizontal flow sedimentation tanks, vertical flow sedimentation tanks, radial flow sedimentation tanks, and inclined plate (tube) sedimentation tanks. The basic principle of each sedimentation tank is to create a stable environment for impurities, allowing them to settle to the bottom under gravity and be removed. However, the sedimentation principle of existing sedimentation tanks limits their removal to impurities with high specific gravity and high settling velocity; they are ineffective at removing impurities with a specific gravity similar to or less than that of water. Specifically, horizontal flow sedimentation tanks require a large area and are difficult to discharge sludge; vertical flow sedimentation tanks are deep, difficult to construct, and have a small single-tank capacity; radial flow sedimentation tanks have complex sludge discharge equipment and are expensive; and inclined plate sedimentation tanks are prone to scaling and are unsuitable for wastewater with high viscous impurities. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a multifunctional sedimentation tank based on corrugated plates with high sedimentation efficiency, automatic flushing and sludge discharge, and adaptability to uneven water volume, as well as its operation method.

[0004] This invention discloses a multifunctional sedimentation tank based on a corrugated plate, comprising a sedimentation tank body divided into an upper tank body and a lower tank body by a central transverse partition. The lower tank body is an emergency tank unit. A left longitudinal partition is provided on the left side of the upper tank body, dividing it into a left chamber and a right chamber. The left chamber is a sludge discharge main channel, connected to a sludge discharge main pipe. A sludge discharge main channel sedimentation thickness monitoring instrument is installed in the sludge discharge main channel. The right chamber, from front to back, consists of an inlet unit, a corrugated plate sedimentation unit, and an outlet unit. An inlet channel level gauge is installed in the inlet unit. The area where the corrugated plate sedimentation unit is located is a corrugated plate sedimentation tank. A scum trough and an inlet channel flushing trough are arranged vertically and vertically on the outer wall of the right chamber. A scum trough scum sedimentation thickness monitoring instrument is installed in the scum trough. The slag trough is connected to a scum discharge pipe. The outlet of the inlet unit is connected to the inlet of the baffle sedimentation unit, allowing the effluent from the inlet unit to enter the baffle sedimentation unit. The outlet of the baffle sedimentation unit is connected to the outlet unit, allowing the effluent from the baffle sedimentation unit to enter the outlet unit. The inlet unit is connected to the emergency pool unit, allowing water from the inlet unit to flow into the emergency pool unit and vice versa. The outlet unit is connected to the sludge discharge main channel, the scum trough, and the inlet main channel flushing tank, allowing water from the outlet unit to flow into the sludge discharge main channel, the scum trough, and the inlet main channel flushing tank. The outlet of the inlet main channel flushing tank is connected to the cleaning inlet of the inlet unit, allowing water from the inlet main channel flushing tank to flow into the inlet unit. The cleaning outlet of the inlet unit is connected to the sludge discharge main channel, allowing water from the inlet unit to flow into the sludge discharge main channel. The folded plate sedimentation unit includes multiple sedimentation troughs spaced apart from each other on a central transverse partition, arranged perpendicular to the inlet water flow direction. A perforated sludge discharge pipe is installed in each sedimentation trough, with its left end inserted into the main sludge discharge channel. A sludge discharge control valve is installed at the left end of the perforated sludge discharge pipe. A sludge concentration monitor is installed in each sedimentation trough. Sludge from the folded plate sedimentation tank can enter the discharge pipe through the openings on the perforated sludge discharge pipe and then be discharged into the main sludge discharge channel. The upper part of the folded plate sedimentation unit... A top scum trough is provided, which is staggered with the bottom sedimentation trough. The right side of the top scum trough is connected to the main scum trough. The baffle sedimentation unit is provided with multiple sets of corrugated baffles spaced apart on the left and right, which forms multiple water flow channels in the baffle sedimentation unit. The bottom of the multiple sets of corrugated baffles is fixedly connected to the top of the middle transverse partition. Each set of corrugated baffles extends from the side of the water inlet unit connected to the baffle sedimentation unit to the side of the water outlet unit connected to the baffle sedimentation unit. The water flow channels between two adjacent sets of corrugated baffles alternately form an enlarged section water flow channel chamber and a narrowed section water flow channel chamber.

[0005] The beneficial effects of this invention are as follows: The mesh design of the inlet grid is as follows: the grid holes are evenly distributed from the top to the upper edge of the main inlet pipe, and there are no holes from the bottom of the pool to the upper edge of the main inlet pipe. This structure of no holes in the lower solid part can, on the one hand, buffer the water impact of the main inlet pipe, so that the water can pass evenly through the inlet grid into the subsequent units; on the other hand, it can form a certain water passage in the main inlet channel, which is convenient for the subsequent cleaning of the main inlet channel. The corrugated baffles, with their alternating crests and troughs, create multiple stages of sudden expansion and contraction within a single water flow channel. As wastewater passes through the expansion stages, the flow velocity suddenly decreases, causing heavier solid particles to quickly settle to the bottom. Conversely, as it passes through the contraction stages, the flow velocity suddenly increases. This repeated velocity variation pushes sediment downstream and allows particles with a density equal to or less than that of water to move towards the surface in turbulent flow. The continuous velocity variation within the corrugated baffles generates turbulence, facilitating collisions of suspended particles. By altering the cross-sectional area, the flow velocity is changed, improving the sedimentation of pollutants in the wastewater. Compared with existing technologies, this invention eliminates the need for adding chemicals such as coagulants and flocculants. Through the design of the corrugated baffles, wastewater passes through a sudden expansion section where the flow velocity suddenly decreases, causing solid particles with a density greater than water to quickly settle to the bottom. Conversely, as the wastewater passes through a sudden contraction section where the flow velocity suddenly increases, small particles and suspended solids collide and rise to the upper surface. This allows the sedimentation tank to achieve flocculation and sedimentation, separating large particles, small particles, and suspended solids from the wastewater, significantly improving sedimentation efficiency. In this invention, the upper edge of the water-facing side trough plate of each top scum trough is lower than the upper edge of the corrugated plate, and the back-water side trough plate of the top scum trough is flush with the upper edge of the corrugated plate. This low-high setting allows the scum on the water surface to be effectively collected in the top scum trough. This invention utilizes gate valve control, incorporating a main outlet flushing gate, a first inlet main outlet flushing gate, a second inlet main outlet flushing gate, an emergency pool inlet flap gate, an inlet main gate, a sludge discharge trough cleaning gate, and an outlet main gate within the sedimentation tank. This ensures the normal operation of the sedimentation tank. Furthermore, by installing inlet channel level gauges, sludge concentration monitors in the sedimentation trough, sludge thickness monitors in the sludge discharge main outlet, emergency pool level gauges, and scum thickness detectors in the scum trough, the invention enables detection, alarm, and control, automatically opening and closing the gate valves to achieve normal operation of the sedimentation tank, as well as inlet main outlet cleaning, sludge discharge and sludge discharge main outlet cleaning, scum discharge, and scum trough cleaning. The inlet main outlet flushing trough has a 5% slope at the bottom, eliminating the need for booster pumps, water pumps, or scum discharge pumps, thus ensuring good water flow impact and thorough removal of impurities. This significantly reduces the construction cost of the sedimentation tank and allows for switching between various operating conditions using hydraulic conditions. This invention combines an emergency tank with a corrugated plate sedimentation tank. When an accident occurs in the subsequent treatment process or when the water volume of the upstream collection water body suddenly increases, the excess sewage can be absorbed and temporarily stored without stopping the sedimentation tank. This also reduces the construction land required and makes the sedimentation tank suitable for different scenarios. The installation of the inlet screen, inlet flap gate, emptying pump, sump, emptying pipe, and check valve in the emergency pool allows the wastewater to undergo filtration and impurity removal before entering the emergency pool, preventing the accumulation of impurities and sludge that would occupy the capacity of the emergency pool. At the same time, the water in the emergency pool can be pumped out and returned to the front end of the process for further treatment.

[0006] Depending on actual needs, the emergency pool can also be used as a sludge storage pool to alleviate sludge discharge pressure. Attached Figure Description

[0007] Figure 1 This is a top plan view of a multifunctional sedimentation tank based on a corrugated plate provided by the present invention; Figure 2 This is a mid-layer plan view of a multifunctional sedimentation tank based on a corrugated plate provided by the present invention; Figure 3 This is a plan view of an emergency tank in a multifunctional sedimentation tank based on a corrugated plate, provided by the present invention. Figure 4 This invention provides a multifunctional sedimentation tank based on a corrugated plate along... Figure 1 The cross-sectional view of line AA shown (the inlet main gate and outlet main gate are in the open state); Figure 5 This invention provides a multifunctional sedimentation tank based on a corrugated plate along... Figure 1 The cross-sectional view of the BB line shown; Figure 6This is an enlarged schematic diagram of the inlet grid in a multifunctional sedimentation tank based on a corrugated plate, provided in an embodiment of the present invention. Figure 7 This is a three-dimensional cross-sectional view of the main inlet channel in a multifunctional sedimentation tank based on a corrugated plate, provided in an embodiment of the present invention. Figure 8 This is a three-dimensional cross-sectional view of the corrugated plate region in a multifunctional sedimentation tank based on corrugated plates, provided in an embodiment of the present invention. In the diagram: 1-Inlet main pipe; 2-Inlet main channel; 3-Inlet grid; 4-Corrugated baffle plate; 5-Top scum trough; 6-Outlet main channel; 7-Outlet main pipe; 8-Bottom sedimentation trough; 9-Perforated sludge discharge pipe; 10-Scum main trough; 11-Scum trough flushing gate; 12-Scum discharge pipe; 13-Sludge discharge pipe control valve; 14-Sludge discharge main channel; 15-Sludge discharge main pipe; 16-Inlet main channel flushing trough; 17-Outlet main channel flushing gate; 18-First inlet main channel flushing gate; 19-Second inlet main channel 20-Flush gate; 21-Emergency pool inlet screen; 22-Emergency pool inlet flap gate; 23-Emergency pool; 24-Sump; 25-Emergency pool drain pump; 26-Inlet main gate; 27-Sludge discharge trough cleaning gate; 28-Check valve; 29-Outlet main gate; 30-Inlet channel level gauge; 31-Sludge concentration monitor for pool bottom sedimentation trough; 32-Sludge thickness monitor for sludge discharge main channel; 33-Emergency pool level gauge; 34-Scum accumulation thickness detector for scum trough. Detailed Implementation

[0008] The present invention will now be described in further detail with reference to embodiments. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0009] like Figure 1-8As shown, the present invention discloses a multifunctional sedimentation tank based on a corrugated plate, comprising a sedimentation tank body, which is divided into an upper tank body and a lower tank body by a middle transverse partition. The lower tank body is an emergency tank unit. A left longitudinal partition is provided on the left side of the upper tank body, dividing the upper tank body into a left chamber and a right chamber. The left chamber is a sludge discharge main channel 14, which is connected to a sludge discharge main pipe 15. A sludge discharge main channel siltation thickness monitoring instrument 32 is installed in the sludge discharge main channel. The right chamber consists of an inlet unit, a corrugated plate sedimentation unit, and an outlet unit from front to back. The water unit is equipped with an inlet channel level gauge 30. The area where the baffle sedimentation unit is located is a corrugated baffle sedimentation tank. A scum trough 10 and an inlet channel flushing trough 16 are spaced vertically on the right exterior wall. A scum trough scum accumulation thickness detector 34 is installed in the scum trough, and a scum discharge pipe 12 is connected to it. The outlet of the water inlet unit is connected to the inlet of the baffle sedimentation unit, allowing the effluent from the water inlet unit to enter the baffle sedimentation unit. The outlet of the baffle sedimentation unit is connected to the outlet unit, allowing the effluent from the baffle sedimentation unit to enter the outlet unit. The water inlet unit is connected to the emergency pool unit, allowing water from the water inlet unit to flow into the emergency pool unit and vice versa. The water outlet unit is connected to the sludge discharge main channel, the scum discharge main channel, and the water inlet main channel flushing channel, respectively, so that water from the water outlet unit can flow into the sludge discharge main channel, the scum discharge main channel, and the water inlet main channel flushing channel. The water outlet of the water inlet main channel flushing channel is connected to the cleaning water inlet of the water inlet unit so that water from the water inlet main channel flushing channel can flow into the water inlet unit. The cleaning water outlet of the water inlet unit is connected to the sludge discharge main channel so that water from the water inlet unit can flow into the sludge discharge main channel.

[0010] The folded plate sedimentation unit includes multiple bottom sedimentation troughs 8 arranged at intervals along the middle horizontal partition and perpendicular to the water flow direction of the inlet unit. A perforated sludge discharge pipe 9 is installed in each bottom sedimentation trough. The left end of the perforated sludge discharge pipe is inserted into the main sludge discharge channel, and a sludge discharge pipe control valve 13 is installed at the left end of the perforated sludge discharge pipe. A bottom sedimentation trough sludge concentration monitor 31 is installed in each bottom sedimentation trough. The sediment at the folded plate sedimentation tank can enter the sludge discharge pipe through the opening on the perforated sludge discharge pipe and then be discharged into the main sludge discharge channel. A top scum trough 5 is provided at the upper part of the folded plate sedimentation unit. The top scum trough and the bottom sludge trough are arranged alternately. The right side of the top scum trough is connected to the main scum trough. The folded plate sedimentation unit is provided with multiple sets of corrugated baffles 4 arranged at intervals on the left and right, so that multiple sets of water flow channels are formed within the folded plate sedimentation unit. The bottom of the multiple sets of corrugated baffles is fixedly connected to the top of the middle transverse partition. Each set of corrugated baffles extends from the side of the inlet unit connected to the folded plate sedimentation unit to the side of the outlet unit connected to the folded plate sedimentation unit. The water flow channels between two adjacent sets of corrugated baffles alternately form an enlarged section water flow channel chamber and a narrowed section water flow channel chamber.

[0011] In one embodiment of the present invention, each set of corrugated plates is a wave-shaped structure, wherein the crests of the wave-shaped structure are arranged opposite each other to form an enlarged water flow channel chamber, and the troughs are arranged opposite each other to form a narrowed water flow channel chamber.

[0012] Preferably, the upper edge of the water-facing side plate of each top scum trough 5 is lower than the upper edge of the corrugated plate 4, and the upper edge of the back-water side plate of the top scum trough 5 is flush with the upper edge of the corrugated plate 4. This low-high setting allows the scum on the water surface to be effectively collected in the top scum trough.

[0013] Preferably, the intermediate horizontal partition at the bottom of the water outlet unit is higher than the intermediate horizontal partition at the bottom of the water inlet unit and the baffle sedimentation unit.

[0014] The water inlet unit may include an inlet grid 3 disposed between the water inlet unit and the baffle sedimentation unit. The inlet grid forms a structure in which the outlet of the water inlet unit is connected to the inlet of the baffle sedimentation unit. The inlet grid 3 is fixedly connected to the corrugated baffle 4. The inlet grid and the front wall of the upper tank form a main inlet channel 2. The upper part of the inlet grid has multiple mesh openings. A main inlet pipe 1 passes through the front wall of the upper tank and connects to the water inlet unit. A main inlet gate 26 is installed at the outlet of the main inlet pipe. The outlet of the main inlet pipe is located below the grid area of ​​the inlet grid, where there are no openings. Preferably, the mesh openings on the inlet grid are circular.

[0015] The structure connecting the outlet of the main inlet flushing channel to the cleaning inlet of the inlet unit can be as follows: a first cleaning opening is provided at the bottom of the left side wall of the main inlet flushing channel connected to the inlet unit, and a first main inlet flushing gate 18 is installed on the first cleaning opening. The structure connecting the cleaning outlet of the inlet unit to the sludge discharge channel can be as follows: an inlet outlet is provided at the bottom of the right wall of the sludge discharge channel corresponding to the position of the main inlet channel, and a second main inlet flushing gate 19 is installed on the inlet outlet.

[0016] Preferably, the bottom wall of the flushing trough 16 of the main inlet channel slopes downward from the position of the main outlet channel toward the main inlet channel, and the slope of the bottom wall of the flushing trough 16 of the main inlet channel slopes downward from the position of the main outlet channel toward the main inlet channel can be 5%.

[0017] The water outlet unit may include a main water outlet channel 6 separated from the baffle sedimentation unit by a rear partition. The left and right sides of the rear partition are respectively connected to the outer wall of the sludge discharge channel and the inner right side of the upper pool, and the bottom wall is fixedly connected to the middle transverse partition. A main water outlet pipe 7 is connected to the rear wall of the main water outlet channel, and a main water outlet pipe gate 29 is installed at the water outlet inlet where the main water outlet pipe connects to the main water outlet channel.

[0018] The structure connecting the water outlet unit to the sludge discharge main channel is as follows: a sludge cleaning port is opened on the lower part of the left side wall of the water outlet main channel at the connection between the water outlet main channel and the sludge discharge main channel, and a sludge discharge trough cleaning gate 27 is installed on the sludge cleaning port.

[0019] The structure connecting the water outlet unit to the scum trough is as follows: a scum flushing port is opened on the upper part of the right side wall of the water outlet main channel at the connection between the water outlet main channel and the scum trough, and a scum trough flushing gate 11 is installed on the scum flushing port.

[0020] The structure connecting the water outlet unit to the flushing channel of the main water inlet is as follows: a second cleaning opening is provided on the lower part of the right side wall of the main water outlet at the location where the main water outlet connects to the flushing channel of the main water inlet, and a flushing gate 17 of the main water outlet is installed on the second cleaning opening.

[0021] The emergency pool unit may include an emergency inlet located on the middle transverse diaphragm on the left side of the main inlet channel. An inlet screen 20 is installed on the emergency inlet, and an emergency pool inlet flap gate 21 is installed on the bottom wall of the middle transverse diaphragm below the screen. The emergency pool inlet flap gate 21 controls the connection between the main inlet channel 2 and the emergency pool 22. A sump 24 is provided on the lower right side of the bottom wall of the emergency pool. The connection between the inlet unit and the emergency pool unit is as follows: at least one emergency pool drain pump 23 is placed in the sump, and the outlets of the emergency pool drain pumps 23 are connected to the main inlet pipe 1 via an emergency pool drain pipe 25. A check valve 28 is installed on the emergency pool drain pipe 25 to ensure that water entering the main inlet pipe 1 does not enter the emergency pool through the emergency pool drain pipe 25. An emergency pool level gauge 33 is installed inside the emergency pool 22. Preferably, the bottom wall of the accident pool is provided with a slope towards the collection pit 24, the collection pit is located at the bottom of the slope, and the slope of the slope of the bottom wall of the accident pool towards the collection pit 24 is preferably 1%.

[0022] In some embodiments, when there is no accident, the accident pool 22 can also be used as a sludge storage pool as needed, and the sludge discharge main channel 14 is connected to the accident pool 22 through the sludge discharge main pipe 15 (not shown in the figure).

[0023] The structure connecting the outlet of the baffle sedimentation unit to the effluent unit can be as follows: the height of the rear baffle is flush with the upper edge of the front trough plate that is in contact with the water in the top scum trough 5; when the sewage flows horizontally through the baffle sedimentation area, the water that reaches the end of the baffle sedimentation area overflows through the upper edge of the rear baffle to the main effluent channel 6, and flows out from the main effluent pipe 7 connected to the main effluent channel 6.

[0024] Preferably, the signal output terminals of the inlet channel level gauge 30, the sludge concentration monitor 31 of the sedimentation tank, the siltation thickness monitor 32 of the main discharge channel, the emergency pool level gauge 33, and the scum accumulation thickness detector 34 of the scum trough are respectively connected to the signal input terminal of the computer via control lines. The signal input terminals of the inlet main gate 26, the outlet main gate 29, the sludge discharge pipe control valve 13, the scum trough flushing gate 11, the first inlet main channel flushing gate 18, the second inlet main channel flushing gate 19, the emergency pool inlet flap gate 21, the sludge discharge trough cleaning gate 27, the outlet main channel flushing gate 17, and the emergency pool drainage pump are respectively connected to the signal output terminal of the computer via control lines.

[0025] The present invention also provides an operating method for a multifunctional sedimentation tank employing a corrugated plate, comprising the following operating steps: The operating procedures include operating procedures under normal operating conditions and operating procedures under accident conditions. The operating procedures under normal operating conditions include the following steps: The first step is to adjust the valves: the main inlet gate 26 and the main outlet gate 29 are normally open; the sludge discharge pipe control valve 13, the scum trough flushing gate 11, the first main inlet flushing gate 18, the second main inlet flushing gate 19, the emergency pool inlet flap gate 21, the sludge discharge trough cleaning gate 27, and the main outlet flushing gate 17 are normally closed.

[0026] In the second step, the incoming water enters the main inlet channel 2 through the main inlet pipe 1. The inlet grid 3 intercepts large solid debris in the main inlet channel 2, and the sewage enters the baffle sedimentation unit. As wastewater passes through the enlarged section of the flow channel in the corrugated baffle 4, the water velocity suddenly decreases, causing solid particles with a density greater than water to quickly settle to the bottom and form sediment. Conversely, as the wastewater passes through the narrowed section of the flow channel, the water velocity suddenly increases, causing small particles and suspended solids to collide and rise to the surface, forming scum. This repeated change in flow velocity pushes the sediment at the bottom downstream and allows particles with a density equal to or less than water to move towards the surface in turbulent flow. The wastewater velocity decreases at the two troughs of the corrugated baffle and then increases at the two peaks, creating turbulence that promotes collisions of suspended particles. By altering the cross-sectional area, the wastewater flow velocity is changed, improving the sedimentation effect of pollutants.

[0027] Sediment deposited at the bottom of the pool is propelled by the water flow into the sedimentation tank 8, thus escaping the plug flow state within the pool. When the sludge concentration monitor 31 indicates that the sediment in the sedimentation tank 8 has reached a predetermined amount, the sludge discharge control valve 13 is opened. Under hydrostatic pressure, the sludge is discharged through the perforated sludge discharge pipe 9 into the main sludge discharge channel 14, and then discharged from the system through the main sludge discharge pipe 15. Floating scum that rises to the surface is collected through the top sludge trough 5 and discharged into the main sludge trough 10, and then discharged from the system through the sludge discharge pipe 12. After passing through the baffle sedimentation unit, the wastewater overflows into the main effluent channel 6, and is then discharged into subsequent treatment units or the municipal wastewater treatment system through the main effluent pipe 7.

[0028] During this process, the main inlet channel is cleaned alternately, followed by sludge removal and sludge discharge channel cleaning, and scum removal and scum tank cleaning. The specific steps are as follows: Main Inlet Channel Cleaning: As more particles are intercepted by the inlet grid 3, the water resistance gradually increases, and the water level in the main inlet channel 2 continues to rise. After the level gauge in the main inlet channel 2 detects that the water level has reached the predetermined level, the main inlet channel cleaning process is executed: the main inlet gate 26 is closed to stop water intake, the main outlet gate 29 is closed to stop water output, the second main inlet flushing gate 19 is opened, and the water flows into the sludge discharge channel 14. At this time, the water stored in the upper layer of the corrugated plate 4 area flows back into the main inlet channel 2, backwashing the inlet grid 3. The screen debris intercepted on the grid is washed and falls into the main inlet channel 2, and enters the sludge discharge channel 14 with the water flow, and is discharged from the system through the sludge discharge main pipe 15. After the water in the upper layer of the corrugated plate area 4 is used up, open the main outlet flushing gate 17 and the first main inlet flushing gate 18. Water in the main outlet channel 6 enters the main inlet channel 2 through the main inlet flushing trough 16 to further flush the screenings in the main inlet channel 2. Because the bottom of the main inlet flushing trough 16 has a 5% slope, it can ensure good water flow impact and achieve thorough removal. After cleaning, close the main outlet flushing gate 17, the first main inlet flushing gate 18, and the second main inlet flushing gate 19 to complete the cleaning process of the main inlet channel.

[0029] Sludge discharge and main sludge discharge channel cleaning: After the sludge concentration monitor 31 in the sedimentation tank 8 shows that the sediment in the sedimentation tank 8 has reached the predetermined amount, the sludge discharge pipe control valve 13 is opened. Under the action of hydrostatic pressure, the sludge is discharged into the main sludge discharge channel 14 through the perforated sludge discharge pipe 9. Because the sludge discharge process is discontinuous, sludge is prone to accumulate in the main sludge discharge channel 14. When the sediment in the main sludge discharge channel reaches the predetermined amount, the sludge discharge tank cleaning gate 27 is opened, and the water in the main outlet channel 6 is used to flush and clean the main sludge discharge channel 14. Finally, the sludge is discharged from the system through the main sludge discharge pipe 15.

[0030] Scum discharge and scum main tank cleaning: Scum is collected in the top scum tank 5 and discharged into the scum main tank 10, and then discharged from the system through the scum discharge pipe 12. When the scum main tank is clogged and the value detected by the scum accumulation thickness detector 34 exceeds the upper limit, the scum tank flushing gate 11 is opened, and the scum main tank 10 is flushed and cleaned using the water stored in the main outlet channel 6.

[0031] Since the cleaning of the main inlet channel, the main sludge discharge channel, and the main scum trough all use water stored during the operation of the pool, the above three cleaning processes need to be carried out alternately to avoid water flow interruption.

[0032] The operational steps under the aforementioned accident conditions include the following: When an accident occurs in the subsequent treatment process or a sudden increase in the volume of water collected at the front end occurs, the excess water needs to be absorbed while the sedimentation tank continues to operate; that is, the water needs to be temporarily stored. In this case, the accident condition procedure is initiated. The inlet flap gate 21 of the accident pool is opened, and the incoming water enters the accident pool 22 through the accident pool inlet screen 20 for temporary storage. Large solid particles are blocked by the accident pool inlet screen 20 in the main inlet channel 2. After the accident ends, the inlet flap gate 21 of the accident pool is closed, and the accident pool drain pump 23 located in the sump 24 starts operating, pumping water evenly into the main inlet pipe 1 through the accident pool drain pipe 25. Solid impurities intercepted in the main inlet channel 2 are flushed using the aforementioned main inlet channel cleaning procedure.

[0033] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A multifunctional sedimentation tank based on a corrugated plate, comprising a sedimentation tank body, wherein the sedimentation tank body is divided into an upper tank body and a lower tank body by a middle transverse partition, characterized in that: The lower pool is an emergency pool unit. A left longitudinal partition is installed on the left side of the upper pool, dividing it into a left chamber and a right chamber. The left chamber is a sludge discharge main channel (14), which is connected to a sludge discharge main pipe (15). A sludge discharge main channel sedimentation thickness monitoring instrument (32) is installed in the sludge discharge main channel. The right chamber consists of an inlet unit, a baffle sedimentation unit, and an outlet unit, arranged sequentially from front to back. An inlet channel level gauge is installed in the inlet unit. The area where the baffle sedimentation unit is located is a corrugated baffle sedimentation tank. A scum trough (10) and an inlet main channel flushing trough (16) are spaced vertically on the outer wall of the right chamber. A scum trough scum sedimentation thickness monitoring instrument (34) is installed in the scum trough. A scum discharge pipe (12) is connected to the scum trough. The outlet of the inlet unit is connected to the inlet of the baffle sedimentation unit so that the effluent from the inlet unit can enter the baffle sedimentation unit. The outlet of the baffle sedimentation unit is connected to the outlet unit so that the effluent from the baffle sedimentation unit can enter the outlet unit. The inlet unit is connected to the emergency pool unit so that the water at the inlet unit can flow into the emergency pool unit and the water at the emergency pool unit can flow into the inlet unit. The outlet unit is connected to the sludge discharge main channel, the scum discharge main channel, and the flushing channel of the inlet main channel so that the water at the outlet unit can flow into the sludge discharge main channel, the scum discharge main channel, and the flushing channel of the inlet main channel. The outlet of the flushing channel of the inlet main channel is connected to the cleaning inlet of the inlet unit so that the water in the flushing channel of the inlet main channel can flow into the inlet unit. The cleaning outlet of the inlet unit is connected to the sludge discharge main channel so that the water at the inlet unit can flow into the sludge discharge main channel. The folded plate sedimentation unit includes multiple bottom sedimentation troughs (8) spaced apart from each other and located on the middle horizontal partition along the direction of the water flow perpendicular to the inlet unit. A perforated sludge discharge pipe (9) is installed in each bottom sedimentation trough. The left end of the perforated sludge discharge pipe is inserted into the main sludge discharge channel, and a sludge discharge pipe control valve (13) is installed at the left end of the perforated sludge discharge pipe. A bottom sedimentation trough sludge concentration monitor (31) is installed in each bottom sedimentation trough. The sludge from the folded plate sedimentation tank can enter the sludge discharge pipe through the opening on the perforated sludge discharge pipe and then be discharged into the main sludge discharge channel. The upper part of the unit is provided with a top scum trough (5), which is staggered with the bottom sedimentation trough. The right side of the top scum trough is connected to the main scum trough. The folded plate sedimentation unit is provided with multiple sets of corrugated plates (4) spaced on the left and right, so that multiple sets of water flow channels are formed in the folded plate sedimentation unit. The bottom of the multiple sets of corrugated plates is fixedly connected to the top of the middle transverse partition. Each set of corrugated plates extends from the side of the water inlet unit connected to the folded plate sedimentation unit to the side of the water outlet unit connected to the folded plate sedimentation unit. The water flow channels between two adjacent sets of corrugated plates alternately form an enlarged section water flow channel chamber and a reduced section water flow channel chamber.

2. The multifunctional sedimentation tank based on a corrugated plate according to claim 1, characterized in that: Each set of corrugated plates has a wave-shaped structure, wherein the crests of the wave-shaped structure are arranged opposite each other to form an enlarged water flow channel chamber, and the troughs are arranged opposite each other to form a narrowed water flow channel chamber.

3. The multifunctional sedimentation tank based on a corrugated plate according to claim 2, characterized in that: The upper edge of the water-facing side trough plate of each top scum trough is lower than the upper edge of the corrugated plate, while the upper edge of the back-water side trough plate of the top scum trough is flush with the upper edge of the corrugated plate.

4. The multifunctional sedimentation tank based on a corrugated plate according to claim 3, characterized in that: The middle horizontal partition at the bottom of the outlet unit is higher than the middle horizontal partition at the bottom of the inlet unit and the baffle sedimentation unit.

5. The multifunctional sedimentation tank based on a corrugated plate according to claim 4, characterized in that: The water inlet unit includes an inlet grid disposed between the water inlet unit and the baffle sedimentation unit. The inlet grid forms a structure in which the outlet of the water inlet unit is connected to the inlet of the baffle sedimentation unit. The inlet grid is fixedly connected to the corrugated baffle. The inlet grid and the front wall of the upper tank form a main water inlet channel. The upper part of the inlet grid has multiple mesh openings. A main water inlet pipe passes through the front wall of the upper tank and is connected to the water inlet unit. A main water inlet gate is installed at the outlet of the main water inlet pipe. The outlet of the main water inlet pipe is located below the grid area of ​​the inlet grid without openings.

6. The multifunctional sedimentation tank based on a corrugated plate according to claim 5, characterized in that: The structure connecting the outlet of the main inlet flushing trough to the cleaning inlet of the inlet unit is as follows: a first cleaning opening is provided at the bottom of the left side wall of the main inlet flushing trough connected to the inlet unit, and a first main inlet flushing gate is installed on the first cleaning opening. The structure connecting the cleaning outlet of the inlet unit to the sludge discharge trough is as follows: an inlet outlet is provided at the bottom of the right wall of the sludge discharge trough corresponding to the position of the main inlet trough, and a second inlet flushing gate is installed on the inlet outlet. The bottom wall of the main inlet flushing trough slopes downward from the position of the outlet trough towards the inlet trough.

7. The multifunctional sedimentation tank based on a corrugated plate according to claim 6, characterized in that: The water outlet unit includes a main water outlet channel separated from the baffle sedimentation unit by a rear partition. The left and right sides of the rear partition are respectively connected to the outer wall of the sludge discharge channel and the inner right side of the upper pool, and the bottom wall is fixedly connected to the middle horizontal partition. A main water outlet pipe is connected to the rear wall of the main water outlet channel, and a main water outlet pipe gate is installed at the water outlet inlet where the main water outlet pipe connects to the main water outlet channel. The structure connecting the water outlet unit to the sludge discharge main channel is as follows: a sludge cleaning port is opened on the lower part of the left side wall of the water outlet main channel at the connection between the water outlet main channel and the sludge discharge main channel, and a sludge discharge trough cleaning gate is installed on the sludge cleaning port. The structure connecting the water outlet unit to the scum trough is as follows: a scum flushing port is opened on the upper part of the right side wall of the water outlet main channel at the connection between the water outlet main channel and the scum trough, and a scum trough flushing gate is installed on the scum flushing port. The structure connecting the water outlet unit to the flushing trough of the main water inlet channel is as follows: a second cleaning opening is provided on the lower part of the right side wall of the main water outlet channel at the location where the main water outlet channel is connected to the flushing trough of the main water inlet channel, and a flushing gate for the main water outlet channel is installed on the second cleaning opening.

8. The multifunctional sedimentation tank based on a corrugated plate according to claim 7, characterized in that: The aforementioned emergency pool unit includes an emergency inlet located on the middle transverse diaphragm on the left side of the main inlet channel. An inlet screen is installed on the emergency inlet, and an emergency pool inlet flap gate is installed on the bottom wall of the middle transverse diaphragm below the screen. The flap gate controls the connection between the main inlet channel and the emergency pool. A sump is located on the lower right side of the bottom wall of the emergency pool. The connection between the inlet unit and the emergency pool unit is as follows: at least one emergency pool venting pump is placed in the sump, and the outlets of the pumps are connected to the main inlet channel via an emergency pool venting pipe. A check valve is installed on the venting pipe. An emergency pool level gauge is installed inside the emergency pool, and a slope is provided on the bottom wall of the emergency pool towards the sump.

9. The multifunctional sedimentation tank based on a corrugated plate according to claim 8, characterized in that: The structure connecting the outlet of the baffle sedimentation unit to the outlet unit is as follows: the height of the rear baffle is flush with the upper edge of the front trough plate that contacts the top scum trough; the water flowing to the end of the baffle sedimentation zone overflows to the main outlet channel through the upper edge of the rear baffle.

10. An operating method for a multifunctional sedimentation tank based on a corrugated plate as described in claim 9, comprising the following operating steps: The operating procedures include operating procedures under normal operating conditions and operating procedures under accident conditions. The operating procedures under normal operating conditions include the following steps: Step 1, adjust the valves: the main inlet gate (26) and the main outlet gate (29) are normally open; the sludge discharge pipe control valve (13), the scum trough flushing gate (11), the first main inlet flushing gate (18), the second main inlet flushing gate (19), the emergency pool inlet flap gate (21), the sludge discharge trough cleaning gate (27), and the main outlet flushing gate (17) are normally closed; In the second step, the water enters the main inlet channel (2) through the main inlet pipe (1). The inlet grid (3) intercepts large solid debris in the main inlet channel. The sewage enters the baffle sedimentation unit. The sewage passes through the enlarged section of the water flow channel in the corrugated baffle (4). The water velocity suddenly decreases, causing solid particles with a specific gravity greater than water in the sewage to quickly sink to the bottom and form sediment. The sewage passes through the narrowed section of the water flow channel in the corrugated baffle. The water velocity suddenly increases, causing small particles and suspended solids in the sewage to collide and float to the upper liquid surface to form scum. The sediments deposited at the bottom of the pool are pushed into the sedimentation trough by the water flow and are removed from the plug flow state in the pool. When the sludge concentration monitor in the sedimentation trough shows that the sediments in the sedimentation trough have reached the predetermined amount, the sludge discharge pipe control valve is opened. Under the action of hydrostatic pressure, the sediments are discharged into the main sludge discharge channel through the perforated sludge discharge pipe and then discharged from the system through the main sludge discharge pipe. The scum that floats to the surface is collected through the top scum trough and discharged into the main scum trough and then discharged from the system through the scum discharge pipe. After passing through the baffle sedimentation unit, the sewage enters the main effluent channel in the form of overflow and is discharged into the subsequent treatment unit or the municipal sewage treatment system through the main effluent pipe. During this process, the following steps are performed alternately: cleaning of the main inlet channel, sludge removal and cleaning of the main sludge discharge channel, and scum removal and cleaning of the main scum tank. Main Inlet Channel Cleaning: After the water level gauge in the main inlet channel detects the predetermined water level, the main inlet channel cleaning process is executed: the main inlet gate is closed to stop water intake, the main outlet gate is closed to stop water output, the second main inlet flushing gate is opened, and water flows into the sludge discharge channel. At this time, the water stored in the upper layer of the corrugated plate area flows back into the main inlet channel, backwashing the inlet grid. The screenings intercepted on the grid are washed and fall into the main inlet channel and enter the sludge discharge channel with the water flow. They are then discharged from the system through the sludge discharge pipe. When the water stored in the upper layer of the corrugated plate area is used up, the main outlet flushing gate and the first main inlet flushing gate are opened. Water stored in the main outlet channel enters the main inlet channel through the main inlet flushing trough to further flush the screenings in the main inlet channel. After cleaning, the main outlet flushing gate, the first main inlet flushing gate, and the second main inlet flushing gate are closed to complete the main inlet channel cleaning process. Sludge discharge and sludge discharge main channel cleaning: After the sludge concentration monitor in the sedimentation tank at the bottom of the tank shows that the sediment in the sedimentation tank has reached the predetermined amount, the sludge discharge pipe control valve is opened. Under the action of hydrostatic pressure, the sludge is discharged into the sludge discharge main channel through the perforated sludge discharge pipe. When the sediment in the sludge discharge main channel reaches the predetermined amount, the sludge discharge tank cleaning gate is opened. The water in the effluent main channel is used to flush and clean the sludge discharge main channel. Finally, the sludge is discharged from the system through the sludge discharge main pipe. Scum discharge and scum tank cleaning: When the scum accumulation thickness detector in the scum tank exceeds the upper limit, open the scum tank flushing gate and use the water in the main outlet channel to flush and clean the scum tank. The operating procedures under the accident conditions include the following steps: When an accident occurs, the inlet flap gate of the accident pool is opened, and water enters the accident pool through the inlet screen of the accident pool for temporary storage. Large solid particles are blocked by the inlet screen of the accident pool in the main inlet channel. After the accident ends, the inlet flap gate of the accident pool is closed, and the drainage pump of the accident pool located in the sump pit starts to run. The water is evenly pumped into the main inlet pipe through the drainage pipe of the accident pool. Solid impurities intercepted in the main inlet channel are flushed by the cleaning steps of the main inlet channel.

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