Multifunctional sedimentation tank based on different-wave folded plate and operation method of multifunctional sedimentation tank

Abstract

The invention discloses a multifunctional sedimentation tank based on a different-wave folded plate and an operation method thereof.The device comprises a sedimentation tank body, the sedimentation tank body is divided into an upper-layer tank body and a lower-layer tank body through a middle transverse partition plate, the lower-layer tank body is provided with an accident tank unit, and a left side chamber of the upper-layer tank body is a main sludge discharge channel; a water inlet unit, a folded plate precipitation unit and a water outlet unit are sequentially arranged in the right side chamber from front to back; a scum main tank and a water inlet main channel flushing tank are arranged on the outer wall of the right side chamber at intervals up and down; a water outlet of the water inlet unit is connected with a water inlet of the folded plate sedimentation unit, a water outlet of the folded plate sedimentation unit is connected with the water outlet unit, the water inlet unit is connected with the accident pool unit, and the water outlet unit is respectively connected with a sludge discharge main channel, a scum main tank and a water inlet main channel flushing tank. A water outlet of the water inlet main canal flushing tank is connected with a cleaning water inlet of the water inlet unit, and a cleaning water outlet of the water inlet unit is connected with the sludge discharge main canal; by adopting the device and the method, the precipitation efficiency is greatly improved, and switching operation of various working conditions is met.

Description

Technical Field

[0001] The invention relates to a sedimentation tank, in particular to a sewage treatment sedimentation tank. Background Art

[0002] Various factors in urban construction have led to the accumulation of a large number of impurities in the rainwater and sewage pipe network, such as silt, garbage, oil, suspended matter, particulate matter, organic matter, heavy metals and other impurities. Adding a pre-treatment impurity stage after the pipe network is of great significance to water treatment plants and water discharge. The existing water treatment plants use more sedimentation tanks: horizontal flow sedimentation tank, vertical flow sedimentation tank, radial flow sedimentation tank, inclined plate (tube) sedimentation tank. The basic principle of each sedimentation tank is to create a stable environment for impurities in the sedimentation tank, so that the impurities can be removed by settling to the bottom of the tank under the action of gravity. The sedimentation principle of the existing sedimentation tank is limited to only remove impurity particles with a large specific gravity and a high settling speed. There is no removal effect for impurities with a specific gravity equivalent to or less than that of water. Specifically, the horizontal flow sedimentation tank occupies a large area and is difficult to discharge mud; the vertical flow sedimentation tank is deep, difficult to construct, and has a small single tank capacity; the radial flow sedimentation tank has complex mud discharge equipment and high cost; the inclined plate sedimentation tank is prone to scaling and is not suitable for sewage with high viscosity of impurities. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a multifunctional sedimentation tank based on a corrugated plate which has high sedimentation efficiency, can realize automatic flushing and sludge discharge, and can be suitable for uneven water volume, and an operation method thereof.

[0004] A multifunctional sedimentation tank based on an abnormal corrugated plate of the present invention comprises a sedimentation tank body, wherein the sedimentation tank body is divided into an upper tank body and a lower tank body by an intermediate transverse partition, wherein the lower tank body is an accident tank unit, and a left longitudinal partition is arranged on the left side of the upper tank body to divide the upper tank body into a left chamber and a right chamber, wherein the left chamber is a sludge discharge main channel, wherein the sludge discharge main channel is connected to a sludge discharge main pipe, wherein a sludge discharge main channel siltation thickness monitor is installed in the sludge discharge main channel, wherein the right chamber comprises an inlet unit, a folded plate sedimentation unit and a water outlet unit from front to back, wherein an inlet channel liquid level gauge is installed in the inlet unit, wherein the area where the folded plate sedimentation unit is located is an abnormal corrugated plate sedimentation tank, wherein a scum main trough and an inlet main channel flushing trough are arranged at intervals on the outer wall of the right chamber; a scum trough sludge siltation thickness detector is installed in the scum main trough, and a scum trough sludge siltation thickness detector is installed in the scum main trough, and a scum trough sludge siltation thickness detector is installed in the scum main trough, and a scum trough sludge siltation thickness detector is installed in the scum main trough. A scum discharge pipe is connected to the slag main tank, the water outlet of the water inlet unit is connected to the water inlet of the folding plate sedimentation unit so that the water outlet of the water inlet unit can enter the folding plate sedimentation unit, the water outlet of the folding plate sedimentation unit is connected to the water outlet unit so that the water outlet of the folding plate sedimentation unit can enter the water outlet unit, the water inlet unit is connected to the accident pool unit so that the water at the water inlet unit can flow into the accident pool unit and the water at the accident pool unit can flow into the water inlet unit, the water outlet unit is respectively connected to the mud discharge main channel, the scum main tank and the water inlet main channel flushing tank so that the water at the water outlet unit can flow into the mud discharge main channel, the scum main tank and the water inlet main channel flushing tank, the water outlet of the water inlet main channel flushing tank is connected to the cleaning water inlet of the water inlet unit so that the water of the water inlet main channel flushing tank can flow into the water inlet unit, and the cleaning water outlet of the water inlet unit is connected to the mud discharge main channel so that the water of the water inlet unit can flow into the mud discharge main channel;

[0005] The folded plate sedimentation unit comprises a plurality of pool bottom sedimentation troughs which are opened on the middle transverse partition and arranged in a direction perpendicular to the water flow of the water inlet unit and are spaced apart from each other. A perforated mud discharge pipe is installed in each pool bottom sedimentation trough. The left end of the perforated mud discharge pipe is inserted into the mud discharge main channel and a mud discharge pipe control valve is installed at the left end of the perforated mud discharge pipe. A pool bottom sedimentation trough sludge concentration monitor is installed in each pool bottom sedimentation trough. The sludge in the abnormal wave folded plate sedimentation tank can enter the mud discharge pipe through the opening on the perforated mud discharge pipe and then be discharged into the mud discharge main channel. At the upper part of the folded plate sedimentation unit A top scum trough is provided, and the top scum trough is arranged in a staggered manner with the sludge trough at the bottom of the pool. The right side of the top scum trough is connected to the scum main trough. A plurality of groups of folded plates are arranged at intervals on the left and right in the folded plate sedimentation unit, so that a plurality of water flow channels are formed in the folded plate sedimentation unit. The bottoms of the plurality of groups of folded plates are fixedly connected to the top of the middle transverse partition. Each group of folded plates extends from a side of the water inlet unit connected to the folded plate sedimentation unit to a side of the water outlet unit connected to the folded plate sedimentation unit. The water flow channels between the two adjacent groups of folded plates on the left and right alternately form an expanded section water flow channel chamber and a reduced section water flow channel chamber.

[0006] The beneficial effects of the present invention are:

[0007] The mesh design of the water inlet grid: the grid holes are evenly distributed from the top to the upper edge of the water inlet main pipe, and no holes are made from the bottom of the pool to the upper edge of the water inlet main pipe; such a structure without holes in the lower body can, on the one hand, buffer the hydraulic impact of the water inlet main pipe, so that the water can evenly pass through the water inlet grid into the subsequent units; on the other hand, a certain water passage can be formed in the water inlet main channel, which is convenient for the subsequent cleaning of the water inlet main channel;

[0008] The folding plates installed alternately at the crests and troughs form multiple sudden expansion sections and sudden contraction sections in a water flow channel. When the sewage passes through the sudden expansion section in the folding plates, the water flow rate suddenly decreases, and the solid particles with a specific gravity greater than water in the sewage quickly sink to the bottom; when the sewage passes through the sudden contraction section in the folding plates, the water flow rate suddenly increases. The water body undergoes repeated changes in flow rate in this way. On the one hand, it can push the sediment at the bottom of the pool downstream, and on the other hand, it can make the particles in the sewage with a specific gravity equal to or less than that of water move to the upper layer of the liquid surface in a turbulent state; the flow rate of the sewage changes continuously in the folding plates, generating turbulence, which is conducive to the collision of suspended particles in the water body. The change in the sewage flow rate is achieved by changing the water flow section, thereby improving the precipitation effect of pollutants in the sewage.

[0009] Compared with the prior art, the present invention does not need to add chemicals, such as coagulants, flocculants, etc., and through the setting of the folded plate, the sewage passes through the sudden expansion section in the folded plate, and the water flow rate suddenly decreases, so that the solid particles with a specific gravity greater than that of water in the sewage quickly sink to the bottom; the sewage passes through the sudden contraction section in the folded plate, and the water flow rate suddenly increases, so that small particles and suspended matter in the sewage collide and float to the upper liquid surface, so that the sedimentation tank can achieve the effect of flocculation and sedimentation, and large particles, small particles and suspended matter are separated from the sewage, and the sedimentation efficiency is greatly improved;

[0010] The upper edge of the water-facing side groove plate of each top scum groove of the present invention is lower than the upper edge of the corrugated plate, and the water-receiving side groove plate of the top scum groove is flush with the upper edge of the corrugated plate. Such a low and high arrangement enables the scum on the water surface to be effectively collected in the top scum groove;

[0011] The present invention controls by gate valves, and arranges a flushing gate for an outlet main channel, a flushing gate for a first inlet main channel, a flushing gate for a second inlet main channel, an inlet flap gate for an accident pool, an inlet main pipe gate, a sludge tank cleaning gate, and an outlet main pipe gate in a sedimentation tank device to realize the normal operation of the sedimentation tank, and arranges an inlet channel level meter, a sludge concentration monitor for a bottom sludge tank, a sludge main channel siltation thickness monitor, an accident pool level meter, and a sludge tank sludge siltation thickness detector to realize detection and alarm and control, and automatically open and close the gate valve to realize the normal operation of the sedimentation tank, the cleaning of the inlet main channel, the sludge discharge and the cleaning of the sludge main channel, the sludge discharge, and the sludge main tank; the bottom of the inlet main channel flushing tank is provided with a slope of 5%, and a good water flow impact can be guaranteed without the need to arrange a booster pump, a water pump, or a sludge discharge pump, so as to realize the thorough removal of impurities, greatly reduce the construction cost of the sedimentation tank, and realize the switching operation of various working conditions by utilizing hydraulic conditions;

[0012] The present invention builds an accident pool together with a corrugated plate sedimentation tank. When an accident occurs in the subsequent treatment process or the water volume of the front-end collected water body suddenly increases, the excess sewage can be absorbed and temporarily stored without stopping the sedimentation tank. At the same time, the construction land is also reduced, so that the sedimentation tank is suitable for different scenarios.

[0013] The setting of the accident pool inlet pollution-blocking grid, accident pool inlet flap gate, accident pool emptying pump, sump, accident pool emptying pipe and check valve in the accident pool can enable the sewage to be filtered and impurity-removed before entering the accident pool, so as to avoid the accumulation of impurities and sludge in the accident pool and occupy the capacity of the accident pool; at the same time, the water in the accident pool can be pumped out and returned to the front end of the process for treatment.

[0014] According to actual needs, the accident pool can also serve as a sludge storage tank to relieve sludge discharge pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a top plan view of a multifunctional sedimentation tank based on a folded plate provided by the present invention;

[0016] Figure 2 It is a middle-layer plan view of a multifunctional sedimentation tank based on a special folded plate provided by the present invention;

[0017] Figure 3 It is a plan view of an accident pool in a multifunctional sedimentation tank based on a special folded plate provided by the present invention;

[0018] Figure 4 The invention provides a multifunctional sedimentation tank based on a special corrugated plate. Figure 1 The cross-sectional view of line AA shown (the water inlet main gate and the water outlet main gate are in the open state);

[0019] Figure 5The invention provides a multifunctional sedimentation tank based on a special corrugated plate. Figure 1 The cross-section along line BB is shown;

[0020] Figure 6 It is an enlarged schematic diagram of a water inlet grid in a multifunctional sedimentation tank based on a corrugated plate provided in an embodiment of the present invention;

[0021] Figure 7 It is a three-dimensional cross-sectional view of a main water inlet channel in a multifunctional sedimentation tank based on a special folded plate provided by an embodiment of the present invention;

[0022] Figure 8 It is a three-dimensional cross-sectional view of a folded plate area in a multifunctional sedimentation tank based on a folded plate provided by an embodiment of the present invention;

[0023] In the figure, 1-water inlet main pipe; 2-water inlet main channel; 3-water inlet grid; 4-corrugated plate; 5-top scum trough; 6-water outlet main channel; 7-water outlet main pipe; 8-bottom mud trough; 9-perforated mud discharge pipe; 10-scum main trough; 11-scum trough flushing gate; 12-scum discharge pipe; 13-mud discharge pipe control valve; 14-mud discharge main channel; 15-mud 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 Flushing gate; 20-accident pool inlet pollution-blocking grid; 21-accident pool inlet flap gate; 22-accident pool; 23-accident pool drain pump; 24-sump; 25-accident pool drain pipe; 26-inlet main pipe gate; 27-sludge trough cleaning gate; 28-check valve; 29-outlet main pipe gate; 30-inlet channel level gauge; 31-bottom sludge trough sludge concentration monitor; 32-sludge main channel siltation thickness monitor; 33-accident pool level gauge; 34-sludge trough sludge siltation thickness detector. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the protection scope of the present invention.

[0025] like Figure 1-8As shown, a multifunctional sedimentation tank based on an abnormal folded plate of the present invention comprises a sedimentation tank body, wherein the sedimentation tank body is divided into an upper tank body and a lower tank body by an intermediate transverse partition, wherein the lower tank body is an accident tank unit, and a left longitudinal partition is arranged on the left side of the upper tank body to divide the upper tank body into a left chamber and a right chamber, wherein the left chamber is a mud discharge main channel 14, wherein the mud discharge main channel is connected to a mud discharge main pipe 15, wherein a mud discharge main channel siltation thickness monitor 32 is installed in the mud discharge main channel, wherein the right chamber is a water inlet unit, a folded plate sedimentation unit and a water outlet unit from front to back, wherein the water inlet unit is connected to the mud discharge main pipe 15, wherein the mud discharge main pipe 15 is connected to the mud discharge main pipe 15, wherein the mud discharge main pipe siltation thickness monitor 32 is installed in the mud discharge main channel, wherein the water inlet unit is connected to the mud discharge main pipe 15, wherein the mud discharge main pipe 15 is connected to the mud discharge main pipe 15, wherein the mud discharge main pipe siltation thickness monitor 32 is installed in the mud discharge main pipe 15, wherein the water inlet unit is connected to the mud discharge main pipe 15, wherein the mud discharge main pipe siltation thickness monitor 32 is connected to ... mud discharge main pipe siltation thickness monitor 32 is connected to the mud discharge main The water unit is installed with a water inlet channel level meter 30. The area where the folded plate sedimentation unit is located is a folded plate sedimentation tank. The scum main tank 10 and the water inlet channel flushing tank 16 are arranged at intervals on the outer wall of the right side chamber; a scum tank scum sedimentation thickness detector 34 is installed in the scum main tank, and a scum discharge pipe 12 is connected to the scum main tank. The water outlet of the water inlet unit is connected to the water inlet of the folded plate sedimentation unit so that the water out of the water inlet unit can enter the folded plate sedimentation unit, and the water outlet of the folded plate sedimentation unit is connected to the water outlet unit so that the water out of the folded plate sedimentation unit can enter the water outlet unit. The water inlet unit is connected to the accident pool unit so that the water at the water inlet unit can flow into the accident pool unit and the water in the accident pool unit can flow into the water inlet unit. The water outlet unit is respectively connected to the mud discharge main channel, the scum main trough and the water inlet main channel flushing trough so that the water at the water outlet unit can flow into the mud discharge main channel, the scum main trough and the water inlet main channel flushing trough. The water outlet of the water inlet main channel flushing trough is connected to the cleaning water inlet of the water inlet unit so that the water of the water inlet main channel flushing trough can flow into the water inlet unit. The cleaning water outlet of the water inlet unit is connected to the mud discharge main channel so that the water of the water inlet unit can flow into the mud discharge main channel.

[0026] The folded plate sedimentation unit includes a plurality of pool bottom sedimentation troughs 8 which are opened on the middle transverse partition and arranged in a direction perpendicular to the water flow of the water inlet unit and spaced apart from each other. A perforated mud discharge pipe 9 is installed in each pool bottom sedimentation trough. The left end of the perforated mud discharge pipe is inserted into the mud discharge main channel and a mud discharge pipe control valve 13 is installed at the left end of the perforated mud discharge pipe. A pool bottom sedimentation trough sludge concentration monitor 31 is installed in each pool bottom sedimentation trough. The sludge in the abnormal wave folded plate sedimentation tank can enter the mud discharge pipe through the opening on the perforated mud discharge pipe and then be discharged into the mud discharge main channel. A top scum groove 5 is arranged on the upper part of the folded plate sedimentation unit, and the top scum groove is arranged in a staggered manner with the bottom mud groove of the pool. The right side of the top scum groove is connected to the scum main groove. A plurality of groups of folded plates 4 are arranged at intervals on the left and right in the folded plate sedimentation unit, so that a plurality of water flow channels are formed in the folded plate sedimentation unit. The bottom of the plurality of groups of folded plates is fixedly connected to the top of the middle transverse partition, and each group of folded 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 the two adjacent groups of folded plates on the left and right alternately form an enlarged section water flow channel chamber and a reduced section water flow channel chamber.

[0027] As an embodiment of the present invention, each group of abnormal wave plates is a wave-shaped structure, wherein the crests of the wave-shaped structure are arranged relative to each other to form an expanded water flow channel chamber, and the troughs are arranged relative to each other to form a reduced water flow channel chamber.

[0028] Preferably, the upper edge of the water-facing side trough plate of each top scum trough 5 is lower than the upper edge of the folded plate 4, and the upper edge of the water-facing side trough plate of the top scum trough 5 is flush with the upper edge of the folded plate 4. Such a low and high setting enables the scum on the water surface to be effectively collected in the top scum trough.

[0029] Preferably, the middle transverse partition at the bottom of the water outlet unit is higher than the middle transverse partition at the bottom of the water inlet unit and the folded plate sedimentation unit.

[0030] The water inlet unit may include a water inlet grid 3 disposed between the water inlet unit and the folding plate sedimentation unit. The water inlet grid constitutes a structure in which the water outlet of the water inlet unit is connected to the water inlet of the folding plate sedimentation unit. The water inlet grid 3 is fixedly connected to the folding plate 4. A water inlet main channel 2 is formed between the water inlet grid and the front wall of the upper tank body. The upper part of the water inlet grid has a plurality of mesh holes. A water inlet main pipe 1 passes through the front side wall of the upper tank body and is connected to the water inlet unit. A water inlet main pipe gate 26 is installed at the outlet of the water inlet main pipe; the outlet of the water inlet main pipe is located below the grid area of ​​the water inlet grid where no hole is opened. Preferably, the mesh holes on the water inlet grid are circular holes.

[0031] The structure in which the water outlet of the water inlet main channel flushing trough is connected to the cleaning water inlet of the water inlet unit can be: a first cleaning hole is provided at the bottom of the left side wall of the water inlet main channel flushing trough connected to the water inlet unit, and a first water inlet main channel flushing gate 18 is installed on the first cleaning hole, and the structure in which the cleaning water outlet of the water inlet unit is connected to the mud discharge main channel can be: a water inlet channel discharge outlet is provided at the bottom of the right wall of the mud discharge main channel corresponding to the position of the water inlet main channel, and a second water inlet main channel flushing gate 19 is installed on the water inlet channel discharge outlet.

[0032] Preferably, the bottom wall of the water inlet main channel flushing groove 16 slopes downward from the water outlet main channel position to the water inlet main channel direction, and the slope of the bottom wall of the water inlet main channel flushing groove 16 slopes downward from the water outlet main channel position to the water inlet main channel direction may be 5%.

[0033] The water outlet unit may include a main water outlet channel 6 separated from a folding plate sedimentation unit by a rear partition, the left and right sides of the rear partition are respectively connected to the outer wall of the mud discharge main channel and the right inner wall of the upper tank body, and the bottom wall is fixedly connected to the middle cross partition, and 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 is connected to the main water outlet channel.

[0034] The structure in which the water outlet unit is connected to the mud discharge main channel is as follows: a mud discharge cleaning port is opened at the lower part of the left side wall of the water outlet main channel where the water outlet main channel is connected to the mud discharge main channel, and a mud discharge tank cleaning gate 27 is installed on the mud discharge cleaning port.

[0035] The structure of the water outlet unit connected to the scum main tank is as follows: a scum flushing port is opened on the upper part of the right side wall of the water outlet main channel where the water outlet main channel is connected to the scum main tank, and a scum tank flushing gate 11 is installed on the scum flushing port.

[0036] The structure in which the water outlet unit is connected to the main water inlet channel flushing trough is as follows: a second cleaning hole is provided at the lower part of the right side wall of the main water outlet channel where the main water outlet channel is connected to the main water inlet channel flushing trough, and a main water outlet channel flushing gate 17 is installed on the second cleaning hole.

[0037] The accident pool unit may include an accident water inlet opened on the middle transverse partition on the left side of the water inlet main channel, a water inlet trash screen 20 is installed on the accident water inlet, and an accident pool water inlet flap gate 21 is installed on the bottom wall of the middle transverse partition below the water inlet trash screen, and the accident pool flap gate 21 controls the connection between the water inlet main channel 2 and the accident pool 22. A sump 24 is arranged on the lower right side of the bottom wall of the accident pool, and the structure in which the water inlet unit is connected to the accident pool unit is as follows: at least one accident pool drain pump 23 is placed in the sump, and the outlet of the accident pool drain pump 23 is connected to the water inlet main pipe 1 through the accident pool drain pipe 25. A check valve 28 is arranged on the accident pool drain pipe 25 to ensure that the water in the water inlet main pipe 1 will not enter the accident pool through the accident pool drain pipe 25. An accident pool level gauge 33 is arranged inside the accident pool 22. Preferably, a slope is provided on the bottom wall of the accident pool toward the sump 24, the sump is located at the bottom of the slope, and the slope of the slope from the bottom wall of the accident pool toward the sump 24 is preferably 1%.

[0038] In some embodiments, when there is no accident, according to actual needs, the accident pool 22 can also serve as a sludge storage tank, and the sludge main channel 14 is connected to the accident pool 22 through the sludge main pipe 15 (not shown in the figure).

[0039] The structure in which the outlet of the folded plate sedimentation unit is connected to the water outlet unit can be: the height of the rear partition is flush with the upper edge of the front trough plate that contacts the water of the top scum trough 5; when the sewage flow passes horizontally through the folded plate sedimentation area, the water flow reaching the end of the folded plate sedimentation area overflows through the upper edge of the rear partition to the outlet main channel 6, and flows out from the outlet main pipe 7 connected to the outlet main channel 6.

[0040] Preferably, the signal output ends of the water inlet channel level meter 30, the sludge concentration monitor 31 of the bottom sludge tank, the siltation thickness monitor 32 of the sludge discharge main channel, the accident pool level meter 33 and the sludge tank sludge siltation thickness detector 34 are respectively connected to the signal input ends of the computer through control lines, and the signal input ends of the water inlet main pipe gate 26, the water outlet main pipe gate 29, the sludge discharge pipe control valve 13, the sludge tank flushing gate 11, the first water inlet main channel flushing gate 18, the second water inlet main channel flushing gate 19, the accident pool water flap gate 21, the sludge discharge tank cleaning gate 27, the water outlet main channel flushing gate 17 and the accident pool drainage pump are respectively connected to the signal output ends of the computer through control lines.

[0041] The present invention also provides an operating method of a multifunctional sedimentation tank using a folded plate, comprising the following operating steps:

[0042] The operation steps include the operation steps under normal operating conditions and the operation steps under accident conditions. The operation steps under normal operating conditions include the following steps:

[0043] The first step is to adjust the valves: the water inlet main gate 26 and the water outlet main gate 29 are in the normally open state; the mud pipe control valve 13, the scum tank flushing gate 11, the first water inlet main channel flushing gate 18, the second water inlet main channel flushing gate 19, the accident pool water flap gate 21, the mud tank cleaning gate 27, and the water outlet main channel flushing gate 17 are in the normally closed state.

[0044] In the second step, the incoming water enters the inlet main channel 2 through the inlet main pipe 1, the inlet grid 3 intercepts large pieces of solid debris in the inlet main channel 2, and the sewage enters the folded plate sedimentation unit. When the sewage passes through the expanded water flow channel chamber in the folded plate 4, the water flow rate suddenly decreases, causing the solid particles in the sewage with a specific gravity greater than that of water to sink rapidly to the bottom to form sediment; when the sewage passes through the reduced water flow channel chamber in the folded plate, the water flow rate suddenly increases, causing small particles and suspended matter in the sewage to collide and float to the upper liquid surface to form scum; the water body repeatedly changes its flow rate in this way, which can, on the one hand, push the sediment at the bottom of the pool downstream, and on the other hand, make the particles in the sewage with a specific gravity equivalent to or less than that of water move to the upper liquid surface in a turbulent state; the flow rate of the sewage decreases at the two troughs of the shaped folded plate, and then increases at the two peaks of the shaped folded plate, generating turbulence, which is conducive to the collision of suspended particles in the water body, and the change of the sewage flow rate is achieved by changing the water flow section, thereby improving the precipitation effect of pollutants in the sewage.

[0045] The sediments deposited at the bottom of the pool enter the bottom sludge tank 8 under the push of the water flow and leave the push flow state in the pool. When the sludge concentration monitor 31 of the bottom sludge tank shows that the sediment in the bottom sludge tank 8 reaches the predetermined amount, the sludge pipe control valve 13 is opened, and the sludge is discharged into the sludge main channel 14 through the perforated sludge pipe 9 under the action of hydrostatic pressure, and then discharged from the system through the sludge main pipe 15. The scum floating to the liquid surface is collected through the top sludge tank 5 and discharged into the sludge main tank 10, and discharged from the system through the sludge discharge pipe 12. After passing through the folded plate sedimentation unit, the sewage enters the outlet main channel 6 in the form of overflow, and is discharged into the subsequent treatment unit or the urban sewage treatment system through the outlet main pipe 7.

[0046] In this process, the main water inlet channel cleaning, mud discharge and mud discharge main channel cleaning, scum discharge and scum main tank cleaning are carried out alternately. The specific steps are as follows:

[0047] Cleaning of the water inlet main channel: As the number of particles intercepted by the water inlet grid 3 increases, the water resistance gradually increases, and the water level of the water inlet main channel 2 continues to rise. After the water inlet channel level gauge in the water inlet main channel 2 detects the predetermined water level, the water inlet main channel cleaning process is executed: the water inlet main pipe gate 26 is controlled to be closed to stop the water inlet, the water outlet main pipe gate 29 is closed to stop the water outlet, and the second water inlet main channel flushing gate 19 is opened, and the water flows into the mud discharge main channel 14. At this time, the water stored in the upper layer of the abnormal corrugated plate 4 area flows back into the water inlet main channel 2, reversely flushing the water inlet grid 3, and the screen residue intercepted on the grid is flushed and falls into the water inlet main channel 2, and enters the mud discharge main channel 14 with the water flow, and is discharged from the system through the mud discharge main pipe 15. When the water in the upper layer of the abnormal folding plate 4 area is used up, the flushing gate 17 of the outlet main channel and the flushing gate 18 of the first inlet main channel are opened, and the water in the outlet main channel 6 enters the inlet main channel 2 through the flushing trough 16 of the inlet main channel, and further flushes the screen residue in the inlet main channel 2. Because the bottom of the flushing trough 16 of the inlet main channel has a slope of 5%, it can ensure good water flow impact and achieve thorough cleaning. After the cleaning is completed, the flushing gate 17 of the outlet main channel, the flushing gate 18 of the first inlet main channel, and the flushing gate 19 of the second inlet main channel are closed to complete the cleaning process of the inlet main channel.

[0048] Sludge discharge and cleaning of the sludge discharge main channel: When the sludge concentration monitor 31 in the bottom sludge tank 8 shows that the sediment in the bottom sludge tank 8 reaches a predetermined amount, the sludge discharge pipe control valve 13 is opened, and the sludge is discharged into the sludge discharge main channel 14 through the perforated sludge discharge pipe 9 under the action of hydrostatic pressure. Since the sludge discharge process is a non-continuous process, sludge accumulation is likely to occur in the sludge discharge main channel 14. When the sediment in the sludge discharge main channel reaches a predetermined amount, the sludge discharge tank cleaning gate 27 is opened, and the water in the outlet main channel 6 is used to flush and clean the sludge discharge main channel 14, and finally discharged from the system through the sludge discharge main pipe 15.

[0049] 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 discharged from the system through the scum discharge pipe 12. When the scum main tank is blocked and the detection value of the scum tank scum accumulation thickness detector 34 exceeds the upper limit, the scum tank flushing gate 11 is opened to flush and clean the scum main tank 10 using the water stored in the outlet main channel 6.

[0050] Since the cleaning of the water inlet main channel, the sludge discharge main channel and the scum main tank all use the water stored during the operation of the pool, the above three cleaning processes need to be performed alternately to avoid water interruption.

[0051] The operation steps under the accident condition include the following steps: when an accident occurs in the subsequent treatment process or the water volume in the front-end water collection suddenly increases, the sedimentation tank does not stop running, and the excess water needs to be absorbed, that is, the water needs to be temporarily stored, then the accident condition program is started. The accident pool water inlet flap gate 21 is opened, and the incoming water enters the accident pool 22 through the accident pool water inlet interception grid 20 for temporary storage, and large particles of solids are blocked by the accident pool water inlet interception grid 20 in the water inlet main channel 2. After the accident is over, the accident pool water inlet flap gate 21 is closed, and the accident pool emptying pump 23 located in the sump 24 starts to run, and the water is evenly pumped into the water inlet main pipe 1 through the accident pool emptying pipe 25. The solid impurities intercepted in the water inlet main channel 2 are rinsed according to the water inlet main channel cleaning step.

[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope 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 an intermediate transverse partition, characterized in that: The lower tank body is an accident tank unit. A left longitudinal partition is arranged on the left side of the upper tank body to divide the upper tank body into a left chamber and a right chamber. The left chamber is a sludge discharge main channel (14). The sludge discharge main channel is connected to a sludge discharge main pipe (15). A sludge discharge main channel siltation thickness monitor (32) is installed in the sludge discharge main channel. The right chamber is composed of an inlet unit, a folded plate sedimentation unit and an outlet unit from front to back. An inlet channel level gauge is installed in the inlet unit. The area where the folded plate sedimentation unit is located is an abnormal wave folded plate sedimentation tank. A scum main trough (10) and an inlet main channel flushing trough (16) are arranged at intervals on the outer wall of the right chamber. A scum trough scum siltation thickness detector (34) is installed in the scum main trough. A scum discharge pipe (12) is connected to the scum main trough. The water outlet of the water inlet unit is connected with the water inlet of the folding plate sedimentation unit so that the water outlet of the water inlet unit can enter the folding plate sedimentation unit, the water outlet of the folding plate sedimentation unit is connected with the water outlet unit so that the water outlet of the folding plate sedimentation unit can enter the water outlet unit, the water inlet unit is connected with the accident pool unit so that the water at the water inlet unit can flow into the accident pool unit and the water at the accident pool unit can flow into the water inlet unit, the water outlet unit is respectively connected with the mud discharge main channel, the scum main trough and the water inlet main channel flushing trough so that the water at the water outlet unit can flow into the mud discharge main channel, the scum main trough and the water inlet main channel flushing trough, the water outlet of the water inlet main channel flushing trough is connected with the cleaning water inlet of the water inlet unit so that the water of the water inlet main channel flushing trough can flow into the water inlet unit, and the cleaning water outlet of the water inlet unit is connected with the mud discharge main channel so that the water of the water inlet unit can flow into the mud discharge main channel; The folded plate sedimentation unit comprises a plurality of pool bottom sedimentation troughs (8) which are opened on the middle transverse partition and arranged in a direction perpendicular to the water flow of the water inlet unit and spaced from each other in front and behind. A perforated mud discharge pipe (9) is installed in each pool bottom sedimentation trough. The left end of the perforated mud discharge pipe is inserted into the mud discharge main channel and a mud discharge pipe control valve (13) is installed at the left end of the perforated mud discharge pipe. A pool bottom sedimentation trough sludge concentration monitor (31) is installed in each pool bottom sedimentation trough. The sludge in the abnormal wave folded plate sedimentation tank can enter the mud discharge pipe through the opening on the perforated mud discharge pipe and then be discharged into the mud discharge main channel. A top scum trough (5) is arranged at the top of the element, and the top scum trough is arranged in a staggered manner with the bottom mud trough of the pool. The right side of the top scum trough is connected to the scum main trough. A plurality of groups of folded plates (4) are arranged at intervals on the left and right in the folded plate sedimentation unit, so that a plurality of groups of water flow channels are formed in the folded plate sedimentation unit. The bottom of the plurality of groups of folded plates is fixedly connected to the top of the middle transverse partition. Each group of folded plates extends from a side of the water inlet unit connected to the folded plate sedimentation unit to a side of the water outlet unit connected to the folded plate sedimentation unit. The water flow channels between the two adjacent groups of folded plates on the left and right alternately form an enlarged section water flow channel chamber and a reduced section water flow channel chamber.

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

3. The multifunctional sedimentation tank based on the folded plate according to claim 2 is characterized in that: The upper edge of the groove plate on the waterfront side of each top scum groove is lower than the upper edge of the abnormal corrugation plate, and the upper edge of the groove plate on the waterfront side of the top scum groove is flush with the upper edge of the abnormal corrugation plate.

4. The multifunctional sedimentation tank based on the folded plate according to claim 1 is characterized in that: The middle transverse partition at the bottom of the water outlet unit is higher than the middle transverse partition at the bottom of the water inlet unit and the folded plate sedimentation unit.

5. The multifunctional sedimentation tank based on the folded plate according to claim 1 is characterized in that: The water inlet unit comprises a water inlet grid arranged between the water inlet unit and the folding plate sedimentation unit, the water inlet grid constitutes a structure in which the water outlet of the water inlet unit is connected to the water inlet of the folding plate sedimentation unit, the water inlet grid is fixedly connected to the folding plate, a water inlet main channel is formed between the water inlet grid and the front wall of the upper tank body, the upper part of the water inlet grid has a plurality of mesh holes, a water inlet main pipe passes through the front side pool wall of the upper tank body and is connected to the water inlet unit, and a water inlet main pipe gate is installed at the outlet of the water inlet main pipe; the outlet of the water inlet main pipe is located at a non-opening position below the grid area of ​​the water inlet grid.

6. The multifunctional sedimentation tank based on the folded plate according to claim 1 is characterized in that: The structure in which the water outlet of the water inlet main channel flushing trough is connected to the cleaning water inlet of the water inlet unit is as follows: a first cleaning hole is provided at the bottom of the left side wall of the water inlet main channel flushing trough connected to the water inlet unit, and a first water inlet main channel flushing gate is installed on the first cleaning hole; the structure in which the cleaning water outlet of the water inlet unit is connected to the mud discharge main channel is as follows: a water inlet channel discharge outlet is provided at the bottom of the right wall of the mud discharge main channel corresponding to the position of the water inlet main channel, and a second water inlet main channel flushing gate is installed on the water inlet channel discharge outlet; the bottom wall of the water inlet main channel flushing trough is inclined downward from the water outlet main channel position toward the direction of the water inlet main channel.

7. The multifunctional sedimentation tank based on the folded plate according to claim 1 is characterized in that: The water outlet unit comprises a water outlet main channel separated from the folded plate sedimentation unit by a rear partition, the left and right sides of the rear partition are respectively connected to the outer wall of the mud discharge main channel and the right inner wall of the upper tank body, and the bottom wall is fixedly connected to the middle transverse partition, the rear wall of the water outlet main channel is connected to a water outlet main pipe, and a water outlet main pipe gate is installed at the water outlet inlet where the water outlet main pipe is connected to the water outlet main channel; The structure of the water outlet unit connected to the mud discharge main channel is as follows: a mud discharge cleaning port is opened at the lower part of the left side wall of the water outlet main channel where the water outlet main channel is connected to the mud discharge main channel, and a mud discharge tank cleaning gate is installed on the mud discharge cleaning port; The structure of the water outlet unit connected to the scum main tank is as follows: a scum flushing port is opened on the upper part of the right side wall of the water outlet main channel where the water outlet main channel is connected to the scum main tank, and a scum tank flushing gate is installed on the scum flushing port; The structure in which the water outlet unit is connected to the water inlet main channel flushing trough is as follows: a second cleaning hole is provided at the lower part of the right side wall of the water outlet main channel where the water outlet main channel is connected to the water inlet main channel flushing trough, and a water outlet main channel flushing gate is installed on the second cleaning hole.

8. The multifunctional sedimentation tank based on the folded plate according to claim 1 is characterized in that: The accident pool unit may include an accident water inlet opened on the middle transverse partition located on the left side of the water inlet main channel, a water inlet trash screen is installed on the accident water inlet, an accident pool water inlet flap gate is installed on the bottom wall of the middle transverse partition below the water inlet trash screen, the accident pool flap gate controls the connection between the water inlet main channel and the accident pool, a sump is arranged on the lower right side of the bottom wall of the accident pool, the structure in which the water inlet unit is connected to the accident pool unit is as follows: at least one accident pool drain pump is placed in the sump, the outlet of the accident pool drain pump is connected to the water inlet main pipe through the accident pool drain pipe, a check valve is arranged on the accident pool drain pipe, an accident pool liquid level gauge is arranged inside the accident pool, and a slope is arranged on the bottom wall of the accident pool toward the sump.

9. The multifunctional sedimentation tank based on the folded plate according to claim 7 is characterized in that: The structure in which the outlet of the folded plate sedimentation unit is connected to the water outlet unit is as follows: the height of the rear partition is flush with the upper edge of the front trough plate that contacts the water of the top scum trough; the water flow reaching the end of the folded plate sedimentation area overflows to the main water outlet channel through the upper edge of the rear partition.

10. An operating method of a multifunctional sedimentation tank based on a corrugated plate according to any one of claims 1 to 9, comprising the following operating steps: The operation steps include the operation steps under normal operating conditions and the operation steps under accident conditions. The operation steps under normal operating conditions include the following steps: The first step is to adjust the valves: the water inlet main pipe gate (26) and the water outlet main pipe gate (29) are in a normally open state; the mud pipe control valve (13), the scum tank flushing gate (11), the first water inlet main channel flushing gate (18), the second water inlet main channel flushing gate (19), the accident pool water flap gate (21), the mud tank cleaning gate (27), and the water outlet main channel flushing gate (17) are in a normally closed state; In the second step, the influent enters the influent main channel (2) through the influent main pipe (1), the influent grid (3) intercepts large pieces of solid debris in the influent main channel, and the sewage enters the folded plate sedimentation unit. The sewage passes through the expanded section water flow channel chamber in the folded plate (4), and the water flow rate suddenly decreases, so that the solid particles with a specific gravity greater than water in the sewage quickly sink to the bottom to form sediment; the sewage passes through the reduced section water flow channel chamber in the folded plate, and the water flow rate suddenly increases, so that the small particles and suspended matter in the sewage collide and float to the upper liquid surface to form scum; The sediments deposited at the bottom of the pool enter the bottom sludge tank under the push of the water flow and leave the push flow state in the pool. When the sludge concentration monitor of the bottom sludge tank shows that the sediment in the bottom sludge 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, and then discharged from the system through the sludge discharge main pipe. The scum floating to the liquid surface is collected through the top sludge tank and discharged into the sludge main tank, and discharged from the system through the sludge discharge pipe. After the sewage passes through the folded plate sedimentation unit, it enters the outlet main channel in the form of overflow, and is discharged into the subsequent treatment unit or the urban sewage treatment system through the outlet main pipe; During this process, the steps of cleaning the water inlet main channel, cleaning the sludge discharge and the sludge discharge main channel, and cleaning the scum discharge and the scum main tank are performed alternately: Cleaning of the inlet main channel: After the inlet channel level gauge in the inlet main channel detects the preset water level, the cleaning process of the inlet main channel is executed: the gate of the inlet main pipe is controlled to be closed, the water inlet is stopped, the gate of the outlet main pipe is closed, the water outlet is stopped, the flushing gate of the second inlet main channel is opened, and the water flows into the sludge discharge main channel. At this time, the upper water in the abnormal corrugated plate area flows back into the inlet main channel, and reversely flushes the inlet grid. The screen residue intercepted on the grid is washed and falls into the inlet main channel, and enters the sludge discharge main channel with the water flow, and is discharged from the system through the sludge discharge main pipe. When the upper water in the abnormal corrugated plate area is used up, the flushing gate of the outlet main channel and the flushing gate of the first inlet main channel are opened, and the water in the outlet main channel enters the inlet main channel through the inlet main channel flushing trough to further flush the screen residue in the inlet main channel. After the cleaning is completed, the flushing gate of the outlet main channel, the flushing gate of the first inlet main channel, and the flushing gate of the second inlet main channel are closed to complete the cleaning process of the inlet main channel; Sludge discharge and cleaning of the sludge discharge main channel: when the sludge concentration monitor in the bottom sludge tank shows that the sediment in the bottom sludge tank has reached the predetermined amount, the sludge discharge pipe control valve is opened, and the sludge is discharged into the sludge discharge main channel through the perforated sludge discharge pipe under the action of hydrostatic pressure. When the sediment in the sludge discharge main channel has reached the predetermined amount, the sludge discharge tank cleaning gate is opened, and the water in the outlet main channel is used to flush and clean the sludge discharge main channel, and finally discharged from the system through the sludge discharge main pipe; Scum discharge and scum main tank cleaning: When the detection value of the scum accumulation thickness detector in the scum tank exceeds the upper limit, open the scum tank flushing gate and use the water stored in the outlet main channel to flush and clean the scum main tank; The operation steps under the accident condition include the following steps: when an accident occurs, the accident pool water inlet flap gate is opened, and the incoming water enters the accident pool through the accident pool water inlet trash grid and is temporarily stored in the accident pool, and large particles of solids are blocked by the accident pool water inlet trash grid in the water inlet main channel. After the accident is over, the accident pool water inlet flap gate is closed, and the accident pool emptying pump located in the sump starts to run, and the water is evenly pumped into the water inlet main pipe through the accident pool emptying pipe. The solid impurities intercepted in the water inlet main channel are flushed according to the water inlet main channel cleaning steps.

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