Backwashing device and backwashing method for biological aerated filter

Abstract

The invention discloses a backwashing device of a biological aerated filter, which is used for removing suspended matters and biological membranes entrained in a filler layer in a tank body, and comprises an input assembly which is arranged on the outer side of the tank body, is positioned on the filler layer of the tank body and is connected with the tank body. And the jet assembly is arranged in the tank body, fixed on the inner wall of the tank body, fixedly connected with the tank body and used for outputting backwash water and air from the upper part, the middle part and the lower part of the periphery of the filler layer to the inside. And the control module is arranged in a control operation system of the biological aerated filter, is in control connection with the input assembly, and is used for controlling the input assembly to provide backwashing water and air for the jet assembly by outputting instructions and signals. The invention further discloses a backwashing method based on the backwashing device of the biological aerated filter. Suspended matters and biological membranes on the upper part, the middle part and the lower part of the whole filler layer can be completely removed, and the filler particles do not need to be lifted for flushing by virtue of upward recoil force, so that the recoil efficiency and the recoil effect are improved.

Description

Technical Field

[0001] The invention relates to the technical field of backwashing, and in particular to a backwashing device and method for an aerated biological filter. Background Art

[0002] The aerated biological filter process is used in municipal sewage treatment plants. The sludge produced is mainly primary sludge and suspended matter and detached biofilm entrained in the filter backwash water.

[0003] Generally, the design of sludge treatment system follows the design of sludge system of activated sludge treatment system. This invisibly ignores a problem that the activated sludge treatment system can store a certain amount of sludge by increasing the sludge concentration. However, since the aerated biological filter process does not have the function of storing sludge, the suspended matter and aged biofilm trapped on the filler must be discharged from the treatment system through backwashing in time. The backwashing of aerated biological filter usually adopts the mode of air washing first, then air-water combined backwashing, and finally water rinsing. During the design process, designers often only consider the backwashing intensity, but do not fully consider the correlation between the backwashing intensity and the filter plate opening rate. Blindly applying the backwashing intensity specified in the specification will cause endless harm. When designing the structure of filter beams, filter columns and filter plates in the filter tank, some structural designers often only consider the gravity of the packing layer but fail to consider the upward force of the backwash water during backwashing. Gravity offsets part of the upward recoil force, which is along the axis of the filter tank and opposite to the direction of gravity. As a result, after the backwash water or air enters the layers of packing, the recoil force will be gradually weakened, and the packing particles from the middle to the upper layers cannot be completely lifted up, making it difficult to remove suspended matter and biofilms entrained between the packing particles. Therefore, it is necessary to increase the pressure of the backwash water or air and extend the backwash time. The backwash efficiency is very low and the backwash effect is poor.

[0004] Therefore, since the gravity of the packing layer offsets part of the upward recoil force, the suspended matter and biofilm entrained in the packing layer are difficult to be completely removed. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an aerated biological filter backwashing device, which flushes suspended matter and biofilm from the periphery of the packing layer to the center through an input component, a spray component and a control module.

[0006] In order to achieve the above object, the present invention is achieved through the following technical solutions:

[0007] A backwashing device for an aerated biological filter tank, used for removing suspended matter and biofilm entrained in a packing layer in a tank body, comprises:

[0008] The input component is arranged on the outside of the pool body, located in the packing layer of the pool body, and connected to the pool body.

[0009] The injection assembly is arranged in the pool body, fixed on the inner wall of the pool body, and fixedly connected to the pool body, and is used to output backwash water and air from the upper, middle and lower parts of the outer periphery of the packing layer to the inside.

[0010] The control module is arranged in the control operation system of the aerated biological filter and is control-connected with the input component to control the input component to provide backwash water and air to the injection component through output instructions and signals.

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

[0012] Under the control of the control module, the input component transports air and recoil water to the injection component respectively, and the injection component sprays air or recoil water from the upper, middle and lower parts of the packing layer from the outside to the inside, and the recoil water or air enters each packing from the outside to the inside. The packing rotates under the action of the recoil force, or rolls on the single-layer packing layer under the force, and the suspended matter and biofilm entrained between the packings are washed down, so the suspended matter and biofilm on the upper, middle and lower packings of the entire packing layer can be completely removed, without relying on the upward recoil force to lift the packing particles for flushing, avoiding the problem of incomplete backwashing due to gravity weakening the recoil force, and improving the recoil efficiency and recoil effect.

[0013] More preferably, the injection assembly comprises:

[0014] The annular pipes are arranged on the inner wall of the pool body, respectively located at the upper part, the middle part and the lower part of the packing layer, and are connected with the input assembly.

[0015] The vertical pipe is arrayed on the ring pipe along the inner wall of the pool body. One end of the vertical pipe is connected to the ring pipe at the top of the packing layer, passes through the ring pipe in the middle, and is connected to the ring pipe at the bottom at the other end. It is used to introduce backwash water or air from the pool wall into the vertical pipe.

[0016] The injection valve is arranged on the vertical pipe, located in the injection hole opened in the vertical pipe, fixedly connected to the injection hole, and is used for injecting backwash water or air to the packing layer in an opening and closing manner.

[0017] With the above technical solution, the annular pipe and the vertical pipe respectively pass backwash water or air from the upper, middle and lower parts of the tank body to the packing layer, and the backwash water or air sprayed from the injection valve flushes the surface of the packing particles along the radial direction of the tank body. During the rotation of the packing particles, the suspended matter and biofilm are completely flushed out by the alternating flushing of backwash water and air, thereby improving the backwashing efficiency. The injection assembly can spray both backwash water and air, which not only saves costs, but also facilitates automatic control by the control module.

[0018] More preferably, the injection valve comprises:

[0019] The bridge plate is arranged on the vertical pipe, crosses the middle edge of the injection hole in the transverse direction, is fixedly connected to the injection hole, and has a distance from the longitudinal edge of the injection hole.

[0020] The rotating piece is arranged on the bridge plate, respectively located on the longitudinal side walls on both sides of the bridge plate, and is rotatably connected with the bridge plate, and is used for automatically adjusting the opening of the injection assembly by changing the angle between the rotating piece and the injection hole.

[0021] The regulator is fixed on the rotating piece and is located in the middle of the rotating piece. There is a gap between the regulator and the bridge plate, and the rotating piece is driven to rotate by telescoping.

[0022] By adopting the above technical scheme, the structure composed of the bridge plate, the rotating plate and the regulator can rotate in the injection hole, and as the backwash water or air pressure changes, the angle between the rotating plate and the injection hole will also change, the opening of the injection valve will also change, and the flow rate of the sprayed backwash water or air will change, ultimately achieving backwashing of different intensities on the packing layer.

[0023] More preferably, the angle between the rotating plate and the injection hole ranges from 0° to 45°.

[0024] By adopting the above technical solution, the jet valve can spray backwash water or air within 0-90 degrees. The jet flow formed by the backwash water or air impacts the surface of the filler particles or the entrained suspended matter and biofilm, and causes the filler particles to rotate.

[0025] Further optimized, the regulator includes:

[0026] The fixed pipe is arranged on a longitudinal side wall of one side of the bridge plate, is fixedly connected to the bridge plate, and is used for driving the bridge plate to rotate toward the injection hole.

[0027] The telescopic tube is sleeved in the fixed tube, one end of which extends out of the fixed tube and is fixedly connected to the bridge plate on the longitudinal side wall on the other side, and the other end contacts the longitudinal side wall on one side.

[0028] The card slot is arranged on the fixed tube, one end of which is a blind end and the other end is an open end.

[0029] The clamping column is fixed on the telescopic tube and is located at the end where the telescopic tube overlaps with the fixed tube. The column head is located on the outside of the fixed tube extending through the clamping slot and is used for moving in the clamping slot.

[0030] The spring is arranged between the bridge plates on the two side walls, is located in the fixed tube and the telescopic tube, and its end is fixedly connected to the bridge plate. The bridge plate is driven to rotate toward the injection hole by extension. The bridge plate drives the spring to contract under the pressure of recoil water or air.

[0031] With the above technical solution, when the backwash water or air flows from the vertical pipe, the rotating pieces on both sides rotate toward the regulator under the action of the impact force to open the injection hole, and the backwash water or air contacts the surface of the filler particles to achieve the backwashing process of removing biofilm and suspended matter. On the contrary, when the backwashing ends, the rotating piece rotates away from the regulator and contacts the injection hole, and the clamp moves to the end of the clamp slot, and the clamp slot blocks the clamp from continuing to move, thereby closing the injection valve.

[0032] Further optimization: the input components include:

[0033] The water inlet pipe is arranged on the outside of the pool body and located in the packing layer of the pool body. The water outlet end thereof passes through the pool body and is connected to the ring pipe, and the water inlet end is connected to the water source pipeline of the backwash water.

[0034] The air inlet pipe is connected to the water inlet pipe and is connected to the air source pipeline of the air to connect the air to the water inlet pipe.

[0035] The intake valve is disassembled and connected to the intake pipe, and is control-connected to the control module to control the air flow by automatically adjusting the valve position.

[0036] The water inlet valve is disassembled and connected to the water inlet pipe, and is control-connected to the control module to control the flow of backwash water by automatically adjusting the valve position.

[0037] The input valve is arranged on the water inlet pipe and is connected to the control module for inputting backwash water and air into the ring pipe.

[0038] The main valve is installed on the water inlet pipe, is connected to the control module, and is interlocked with the air inlet valve, input valve and water inlet valve respectively.

[0039] By adopting the above technical solution, the air intake valve, the main valve and the input valve perform related switching actions under the control of the control module to connect or disconnect the air; the water inlet valve, the air intake valve and the main valve perform related switching actions under the control of the control module to connect or disconnect the backwash water, thereby completing the staggered cycle backwash process.

[0040] Further optimization is that the water inlet valve, air inlet valve, input valve and main valve all use automatic regulating valves.

[0041] By adopting the above technical solution, the water inlet valve, air inlet valve, input valve and main valve are set to a mode of associated interlocking action in the control module through an automatic regulating valve to realize the backwashing process.

[0042] Further optimization: the control module includes:

[0043] The control cabinet is respectively connected to the air inlet valve, the water inlet valve, the main valve and the input valve for outputting control signals to the air inlet valve, the water inlet valve, the main valve and the input valve.

[0044] The control terminal is arranged in the control operating system of the aerated biological filter and is connected to the control cabinet for outputting instructions to the control cabinet.

[0045] By adopting the above technical solution, the associated interlocking action mode of the air inlet valve, water inlet valve, main valve and input valve is set in the control operating system through the control terminal, and then the control signal is transmitted through the control cabinet to realize the automatic control of the backwashing process.

[0046] The present invention also discloses a backwashing method based on a backwashing device for an aerated biological filter, which backwashes suspended matter and biofilm entrained in a packing layer in an air-washing-water-washing-air-washing purge manner, and is characterized by comprising:

[0047] S1 air wash:

[0048] The control terminal outputs the opening control command to the control cabinet, and the control cabinet outputs the opening control signal to the air intake valve and the main valve. The input valve interlocking action opens to introduce air into the ring pipe.

[0049] After the air enters the vertical pipe, it impacts the rotating plate, and the rotating plate is separated from the injection hole under the impact of air pressure, so that the air is sprayed onto the surface of the filler.

[0050] S2 Wash:

[0051] The command to close the air inlet valve and the water inlet valve is output to the control cabinet, and the control cabinet outputs the corresponding control signal to the air inlet valve and the water inlet valve, and the air inlet valve is closed and the water inlet valve is opened.

[0052] The backwash water flows through the water inlet pipe and enters the annular pipe. Under the pressure of the backwash water, the backwash water impacts the rotating plate and separates from the spray hole, so that the backwash water is sprayed on the surface of the seasoning.

[0053] S3 gas purge:

[0054] The instructions for closing the water inlet valve and opening the air inlet valve are respectively output to the control cabinet, and the control cabinet outputs corresponding control signals to the water inlet valve and the air inlet valve, closing the backwash water and introducing air into the pool body.

[0055] The backwash water opens the rotating blades under pressure, flushing and sweeping the moisture and remaining suspended matter and biofilm on the surface of the packing layer.

[0056] By adopting the above technical scheme, the filler particles are rotated under the action of air or backwash water by first air washing, then water washing and finally air washing and purging, so that the suspended matter and biofilm in the filler layer can be completely removed, thereby improving the efficiency of backwashing.

[0057] Further optimization includes:

[0058] The main valve is opened, and the input valve and intake valve are opened.

[0059] The air inlet valve is opened and the water inlet valve is interlocked and closed.

[0060] The main valve is closed, and the input valve, water inlet valve and air inlet valve are closed.

[0061] By adopting the above technical solution, the input valve, the air intake valve and the main valve are linked and interlocked, and the water inlet valve and the air intake valve are linked and interlocked, so as to realize the process of automatically backwashing the packing layer under the control of the control terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a structural diagram of embodiment 1.

[0063] Figure 2 It is a schematic diagram of the structure of the injection assembly in the first embodiment.

[0064] Figure 3 It is a schematic diagram of the structure of the injection valve in the first embodiment.

[0065] Figure 4 Schematic diagram of the structure of the regulator in Example 1.

[0066] Figure 5 It is a schematic structural diagram of a cross-section of the regulator in the first embodiment.

[0067] Figure 6 This is a schematic diagram of the process of backwashing the packing layer by combining Example 1 and Example 2.

[0068] Figure markings: 1-tank body; 2-input assembly; 21-air inlet pipe; 22-water inlet pipe; 23-air inlet valve; 24-water inlet valve; 25-main valve; 26-input valve; 3-injection assembly; 31-annular pipe; 32-vertical pipe; 321-injection hole; 33-injection valve; 330-bridge plate; 331-rotating plate; 332-fixed pipe; 333-telescopic pipe; 334-card slot; 335-card column; 336-spring; 4-control module; 41-control terminal; 42-control cabinet; 5-filler particles. DETAILED DESCRIPTION

[0069] The following is combined with Figure 1-Figure 6 The present invention is further described in detail.

[0070] Embodiment 1

[0071] A backwashing device for an aerated biological filter is used to remove suspended matter and biofilm entrained in a packing layer in a tank body 1, such as Figure 1 As shown, including:

[0072] The input component 2 is arranged outside the cell body 1 , located in the packing layer of the cell body 1 , and connected to the cell body 1 .

[0073] The injection assembly 3 is arranged in the pool body 1, fixed on the inner wall of the pool body 1, and fixedly connected to the pool body 1, and is used to output backwash water and air from the upper, middle and lower parts of the outer periphery of the packing layer to the inside.

[0074] The control module 4 is arranged in the control operation system of the aerated biological filter and is control-connected with the input component 2 for controlling the input component 2 to provide backwash water and air to the injection component 3 through output instructions and signals.

[0075] Under the control of the control module 4, the input component 2 transports air and recoil water to the injection component 3 respectively, and the injection component 3 sprays air or recoil water from the upper, middle and lower parts of the packing layer from the outside to the inside, and the recoil water or air enters each packing from the outside to the inside. The packing rotates under the action of the recoil force, or rolls on the single-layer packing layer under the force, and the suspended matter and biofilm entrained between the packings are washed down, so the suspended matter and biofilm on the upper, middle and lower packings of the entire packing layer can be completely removed, and there is no need to rely on the upward recoil force to lift the packing particles 5 for flushing, thereby avoiding the problem of incomplete backwashing due to gravity weakening the recoil force, thereby improving the recoil efficiency and recoil effect.

[0076] Specifically, Figure 1 and Figure 2 As shown, the injection assembly 3 in this embodiment includes:

[0077] The annular pipe 31 is arranged on the inner wall of the tank body 1 , respectively located at the upper part, the middle part and the lower part of the packing layer, and is welded to the inner wall of the tank body 1 , and the pipe wall is connected to the input component 2 .

[0078] The vertical pipe 32 is arrayed on the annular pipe 31 along the inner wall of the pool body 1, one end of which is connected to the annular pipe 31 at the upper part of the packing layer, passes through the annular pipe 31 in the middle, and the other end is connected to the annular pipe 31 at the lower part, so as to introduce backwash water or air into the vertical pipe 32 from the pool wall.

[0079] The injection valve 33 is arranged on the vertical pipe 32, located in the injection hole 321 opened in the vertical pipe 32, and fixedly connected to the injection hole 321, and is used for injecting backwash water or air to the packing layer in an opening and closing manner.

[0080] The annular pipe 31 and the vertical pipe 32 respectively pass backwash water or air from the upper, middle and lower parts of the tank body 1 to the packing layer, and the backwash water or air sprayed from the injection valve 33 flushes the surface of the packing particles 5 along the radial direction of the tank body 1. During the rotation of the packing particles 5, the suspended matter and biofilm are completely flushed out by the alternating flushing of backwash water and air, thereby improving the backwashing efficiency. The injection assembly 3 can spray both backwash water and air, which not only saves costs, but also facilitates automatic control by the control module 4.

[0081] Specifically, Figure 3 and Figure 4 As shown, the injection valve 33 in this embodiment includes:

[0082] The bridge plate 330 is disposed on the vertical pipe 32 , transversely spans the middle edge of the injection hole 321 , is fixedly connected to the injection hole 321 , and has a distance from the longitudinal edge of the injection hole 321 .

[0083] The rotating piece 331 is arranged on the bridge plate 330 and is respectively located on the longitudinal side walls on both sides of the bridge plate 330 , and is rotatably connected to the bridge plate 330 , and is used to change the angle between the rotating piece 331 and the injection hole 321 by rotating to automatically adjust the opening of the injection assembly 3 .

[0084] The adjuster is fixed on the rotating piece 331 and is located in the middle of the rotating piece 331 . There is a gap between the adjuster and the bridge plate 330 . The rotating piece 331 is driven to rotate by telescoping.

[0085] The structure composed of the bridge plate 330, the rotating plate 331 and the regulator can rotate in the injection hole 321, and as the backwash water or air pressure changes, the angle between the rotating plate 331 and the injection hole 321 will also change, the opening of the injection valve 33 will also change, and the flow rate of the sprayed backwash water or air will change, ultimately achieving backwashing of the packing layer with different intensities.

[0086] Specifically, Figure 3 and Figure 6 As shown, the angle between the rotating piece 331 and the injection hole 321 in this embodiment ranges from 0° to 45°, so that the injection valve 33 can spray backwash water or air within 0-90°. The jet flow formed by the backwash water or air impacts the surface of the filler particles 5 or the entrained suspended matter and biofilm, and causes the filler particles 5 to rotate.

[0087] Specifically, Figure 3 , Figure 4 as well as Figure 5 As shown, the regulator in this embodiment includes:

[0088] The fixed pipe 332 is disposed on a longitudinal side wall of the bridge plate 330 and is fixedly connected to the bridge plate 330 , and is used to drive the bridge plate 330 to rotate toward the injection hole 321 .

[0089] The telescopic tube 333 is sleeved in the fixed tube 332, one end of which extends out of the fixed tube 332 and is fixedly connected to the bridge plate 330 on the other longitudinal side wall, and the other end contacts one longitudinal side wall.

[0090] The slot 334 is provided on the fixing tube 332 , one end of which is a blind end and the other end is an open end.

[0091] The clamping column 335 is fixed on the telescopic tube 333 and is located at the end where the telescopic tube 333 overlaps with the fixed tube 332 . Its column head is located outside the fixed tube 332 and extends through the clamping slot 334 , and is used to move in the clamping slot 334 .

[0092] The spring 336 is arranged between the bridge plates 330 on the two side walls, and is located in the fixed tube 332 and the telescopic tube 333. Its ends are fixedly connected to the bridge plate 330. The bridge plate 330 is driven to rotate toward the injection hole 321 by extending. The bridge plate 330 drives the spring 336 to contract under the pressure of the recoil water or air.

[0093] When the backwash water or air flows from the vertical pipe 32, the rotating pieces 331 on both sides rotate toward the regulator under the action of the impact force to open the injection hole 321, and the backwash water or air contacts the surface of the filler particles 5 to achieve the backwashing process of removing biofilm and suspended matter. On the contrary, when the backwashing is finished, the rotating piece 331 rotates away from the regulator and contacts the injection hole 321, and the clamping column 335 moves to the end of the clamping groove 334, and the clamping groove 334 blocks the clamping column 335 from continuing to move, thereby closing the injection valve 33.

[0094] Specifically, Figure 1 and Figure 2 As shown, the input component 2 in this embodiment includes:

[0095] The water inlet pipe 22 is arranged outside the pool body 1 and located in the packing layer of the pool body 1. Its water outlet end passes through the pool body 1 and is connected to the ring pipe 31, and its water inlet end is connected to the water source pipeline of the backwash water.

[0096] The air inlet pipe 21 is connected to the water inlet pipe 22 and is connected to an air source pipeline for supplying air to the water inlet pipe 22 .

[0097] The air intake valve 23 is detachably connected to the air intake pipe 21 and is control-connected to the control module 4 for controlling the air flow by automatically adjusting the valve position.

[0098] The water inlet valve 24 is detachably connected to the water inlet pipe 22 and is control-connected to the control module 4 for controlling the flow of the backwash water by automatically adjusting the valve position.

[0099] The input valve 26 is disposed on the water inlet pipe 22 , located downstream of the main valve 25 , and is control-connected to the control module 4 , and is used for inputting backwash water and air into the ring pipe 31 .

[0100] The main valve 25 is installed on the water inlet pipe 22, is control-connected with the control module 4, and is interlocked with the air inlet valve 23, the input valve 26 and the water inlet valve 24 respectively.

[0101] The air intake valve 23, the main valve 25 and the input valve 26 perform related switching actions under the control of the control module 4 to connect or disconnect the air; the water intake valve 24, the air intake valve 23 and the main valve 25 perform related switching actions under the control of the control module 4 to connect or disconnect the backwash water, thereby completing the staggered cycle backwash process.

[0102] Specifically, Figure 1 As shown, the water inlet valve 24, the air inlet valve 23, the input valve 26 and the main valve 25 in this embodiment are all automatic regulating valves, and the water inlet valve 24, the air inlet valve 23, the input valve 26 and the main valve 25 are set to the mode of associated interlocking action in the control module 4 through the automatic regulating valve to realize the backwashing process.

[0103] Specifically, Figure 1 As shown, the control module 4 in this embodiment includes:

[0104] The control cabinet 42 is respectively connected to the air inlet valve 23 , the water inlet valve 24 , the main valve 25 and the input valve 26 for outputting control signals to the air inlet valve 23 , the water inlet valve 24 , the main valve 25 and the input valve 26 .

[0105] The control terminal 41 is arranged in the control operating system of the aerated biological filter and is connected to the control cabinet 42 for outputting instructions to the control cabinet 42. The control cabinet 42 is also used for feeding back the actuation of the air inlet valve 23, the water inlet valve 24, the main valve 25 and the input valve 26 to the control terminal 41 through signals.

[0106] The associated interlocking action mode of the air inlet valve 23, the water inlet valve 24, the main valve 25 and the input valve 26 is set in the control operating system through the control terminal 41, and then the control signal is transmitted through the control cabinet 42 to realize the automatic control of the backwashing process.

[0107] Embodiment 2

[0108] This embodiment discloses a backwashing method based on a backwashing device for an aerated biological filter, which backwashes suspended matter and biofilm entrained in a packing layer in an air-washing-water-washing-air-washing purge manner, and is characterized by comprising:

[0109] S1 air wash:

[0110] The control terminal 41 outputs an opening control instruction to the control cabinet 42 , and the control cabinet 42 outputs an opening control signal to the intake valve 23 and the main valve 25 , and the input valve 26 is interlocked and opened to introduce air into the ring pipe 31 .

[0111] After the air enters the vertical pipe 32, it impacts the rotating plate 331. The rotating plate 331 is separated from the injection hole 321 under the impact of the air pressure, so that the air is sprayed onto the surface of the filler.

[0112] S2 Wash:

[0113] The command for closing the air inlet valve 23 and the water inlet valve 24 is output to the control cabinet 42, and the control cabinet 42 outputs corresponding control signals to the air inlet valve 23 and the water inlet valve 24, so that the air inlet valve 23 is closed and the water inlet valve 24 is opened.

[0114] The backwash water flows through the water inlet pipe 22 and enters the annular pipe 31. Under the pressure of the backwash water, the backwash water impacts the rotating plate 331 and separates from the spray hole 321, so that the backwash water is sprayed on the surface of the seasoning.

[0115] S3 gas purge:

[0116] The instructions for closing the water inlet valve 24 and opening the air inlet valve 23 are respectively output to the control cabinet 42, and the control cabinet 42 outputs corresponding control signals to the water inlet valve 24 and the air inlet valve 23, closing the backwash water and introducing air into the pool body 1.

[0117] The backwash water, under pressure, opens the rotating blade 331, and washes and sweeps away the moisture, remaining suspended matter and biofilm on the surface of the packing layer.

[0118] By first air washing, then water washing and finally air washing and purging, the filler particles 5 are rotated under the action of air or backwashing water, so that the suspended matter and biofilm in the filler layer can be completely removed, thereby improving the efficiency of backwashing.

[0119] Specifically, this embodiment also includes:

[0120] The main valve 25 is opened, and the input valve 26 and the intake valve 23 are opened.

[0121] The air inlet valve 23 is opened, and the water inlet valve 24 is interlocked and closed, cutting off the air and introducing the air into the annular pipe 31 .

[0122] The main valve 25 is closed, and the input valve 26, the water inlet valve 24, and the air inlet valve 23 are closed to cut off the backwash water or air.

[0123] In a further embodiment, the opening and closing interlocking modes of the main valve 25 and the input valve 26 are respectively set in the control operation system: when the main valve 25 is opened, the input valve 26 is interlocked and opened; when the main valve 25 is closed, the input valve 26 is interlocked and closed. The main valve 25 and the air intake valve 23 and the water intake valve 24 are set in a conditional interlocking mode: when the main valve 25 is opened, the air intake valve 23 is interlocked with the main valve 25 to open, and the water intake valve 24 is interlocked and closed; when the air intake valve 23 is closed, the water intake valve 24 is interlocked with the air intake valve 23 to open.

[0124] The input valve 26 , the air intake valve 23 and the main valve 25 are linked and interlocked, and the water inlet valve 24 and the air intake valve 23 are linked and interlocked, so as to realize the process of automatically backwashing the packing layer under the control of the control terminal 41 .

[0125] Please combine Figure 1-Figure 6 In the control operating system of the control terminal 41, the association interlocking mode of the second embodiment is combined with the first embodiment, and the specific backwashing process is described as follows:

[0126] Air Wash:

[0127] The control terminal 41 outputs the command to the control cabinet 42, and the control cabinet 42 converts the command into a control signal to the main valve 25, and the air intake valve 23 and the input valve 26 are opened in a chain action, and the air is connected from the air intake pipe 21 to the water intake pipe 22. The air flows through the input valve 26 and enters the ring pipe 31, and then flows along the inner wall of the tank body 1 to all the vertical pipes 32. When the air enters the vertical pipe 32, it impacts the rotating piece 331. Since the air has a certain pressure, it also has a certain impact force. The rotating pieces 331 on both sides rotate toward the regulator under the action of the impact force and compress the spring 336. The spring 336 drives the telescopic tube 333 to move in the fixed tube 332 and instantly opens the injection hole 321. The rotating piece 331 is separated from the injection hole 321 under the impact of the air. The air is sprayed along the radial direction of the tank body 1 into the distribution space of the filler particles 5 in the filler layer, and contacts the biofilm and suspended matter on the surface of the filler particles 5, forming an air recoil mode in which the gaps between adjacent filler particles 5 flush the suspended matter and biofilm from the periphery to the center of the filler layer. The filler particles 5 rotate to varying degrees under the impact of the air, so that the adjacent filler particles 5 form a relative movement in a limited space, and part of the entrained suspended matter and biofilm will fall off the filler particles 5 due to the relative movement, vibration generated by the impact, and impact force.

[0128] Washable:

[0129] The air inlet valve 23 is closed, and the water inlet valve 24 is opened in a chain manner. The backwash water is connected to the water inlet pipe 22, flows through the input valve 26, enters the annular pipe 31, and then flows to all the vertical pipes 32 along the inner wall of the tank body 1. Similar to the process of air entering and spraying, when the backwash water enters the vertical pipe 32, it is directly sprayed out from the spray hole 321. Since the backwash water also has a certain impact force, the rotating pieces 331 on both sides still open the spray hole 321 under the action of the impact force, and sprays in the radial direction of the tank body 1 into the distribution space of the filler particles 5 in the filler layer, and contacts with the biofilm and suspended matter on the surface of the filler particles 5, forming a water washing backwashing mode that flushes the suspended matter and biofilm from the periphery of the filler layer to the center along the gaps between adjacent filler particles 5. The filler particles 5 rotate to varying degrees under the action of the air impact force, causing relative movement between adjacent filler particles 5 in a limited space. Some of the entrained suspended matter and biofilm are washed down by the backwash water and discharged out of the pool body 1 along with the backwash water. It should be noted that discharging backwash water or air out of the pool body 1 belongs to the existing conventional technology. Therefore, in order to clarify the specific structure in the drawings of the specification, there is no need to elaborate here.

[0130] Gas purge:

[0131] Close the water inlet valve 24, and the air inlet valve 23 is opened in a chain reaction to send air into the vertical pipe 32 again. Similar to the air washing process, the air blows the backwash water in the annular pipe 31 and the vertical pipe 32, the remaining biofilm on the surface of the filler particles 5, and the backwash water mixed with suspended matter and biofilm in the filler layer out of the tank body 1, completing the purge of the filler layer and the input component 2, thereby achieving the purpose of completely removing suspended matter and biofilm.

[0132] All associated interlocking modes are released in the control operating system, and the main valve 25, the input valve 26, the air inlet valve 23, and the water inlet valve 24 are closed to end the backwashing process.

[0133] In summary, under the control of the control module 4, the input component 2 and the injection component 3 are first air-washed, then water-washed, and finally air-washed and purged, so that the filler particles 5 rotate under the action of air and backwash water, and the suspended matter and biofilm present in the filler layer can be completely removed, thereby improving the efficiency and effect of backwashing.

[0134] This specific embodiment is only an explanation of the invention, and it is not a limitation of the invention. After reading this specification, a person skilled in the art can control the cabinet to feed back the actuation of the air inlet valve, the water inlet valve, the main valve and the input valve through a signal to the control terminal to make non-creative modifications to this embodiment as needed, but as long as it is within the protection scope of the present invention, it is protected by the patent law.

Claims

1. A backwashing device for an aerated biological filter, used for removing suspended matter and biofilm entrained in a packing layer in a tank body (1), characterized in that: include: An input component (2) is arranged outside the cell body (1), located in the packing layer of the cell body (1), and connected to the cell body (1); A spray assembly (3) is arranged in the tank body (1), fixed on the inner wall of the tank body (1), and fixedly connected to the tank body (1), and is used to output backwash water and air from the upper part, the middle part and the lower part of the outer periphery of the packing layer to the inside; The control module (4) is arranged in the control operation system of the aerated biological filter and is control-connected to the input component (2) and is used to control the input component (2) to provide backwash water and air to the injection component (3) through output instructions and signals.

2. The aerated biological filter backwashing device according to claim 1, characterized in that: The injection assembly (3) comprises: annular pipes (31), arranged on the inner wall of the pool body (1), respectively located at the upper part, the middle part and the lower part of the packing layer, and connected to the input assembly (2), for spraying backwash water or air from the pool wall to the center of the packing layer; A vertical pipe (32) is arranged in an array on the annular pipe (31) along the inner wall of the tank body (1), one end of which is connected to the annular pipe (31) at the upper part of the packing layer, passes through the annular pipe (31) in the middle part, and the other end is connected to the annular pipe (31) at the lower part; The injection valve (33) is arranged on the vertical pipe (32), is located in the injection hole (321) opened in the vertical pipe (32), is fixedly connected to the injection hole (321), and is used to inject backwash water or air to the packing layer in an open and closed manner.

3. The aerated biological filter backwashing device according to claim 2, characterized in that: The injection valve comprises: A bridge plate (330) is arranged on the vertical pipe (32), transversely straddles the middle edge of the injection hole (321), is fixedly connected to the injection hole (321), and has a distance from the longitudinal edge of the injection hole (321); A rotating sheet (331) is arranged on the bridge plate (330), is respectively located on the longitudinal side walls on both sides of the bridge plate (330), is rotatably connected to the bridge plate (330), and is used to change the angle between the rotating sheet and the injection hole (321) by rotating, so as to automatically adjust the opening of the injection assembly (3); The adjuster is fixed on the rotating piece (331) and is located in the middle of the rotating piece (331). There is a gap between the adjuster and the bridge plate (330). The adjusting piece (331) is driven to rotate by telescoping.

4. The aerated biological filter backwashing device according to claim 3, characterized in that: The included angle between the rotating plate (331) and the injection hole (321) ranges from 0° to 45°.

5. The aerated biological filter backwashing device according to claim 3, characterized in that: The regulator comprises: A fixed pipe (332), arranged on a longitudinal side wall of one side of the bridge plate (330), fixedly connected to the bridge plate (330), and used for driving the bridge plate (330) to rotate toward the injection hole (321); A telescopic tube (333) is sleeved inside the fixed tube (332), one end of which extends out of the fixed tube (332) and is fixedly connected to the bridge plate (330) on the longitudinal side wall on the other side, and the other end of which contacts the longitudinal side wall on one side; A clamping groove (334) is provided on the fixing tube (332), one end of which is a blind end and the other end is an open end; A clamping column (335) is fixed on the telescopic tube (333) and is located at the end where the telescopic tube (333) and the fixed tube (332) overlap, and its column head is located on the outside of the fixed tube (332) that passes through the clamping slot (334) and extends out, and is used to move in the clamping slot (334); The spring (336) is arranged between the bridge plates (330) on the two side walls, and is located in the fixed tube (332) and the telescopic tube (333). The end of the spring (336) is fixedly connected to the bridge plate (330). The bridge plate (330) is driven to rotate toward the injection hole (321) by extending. The bridge plate (330) drives the spring (336) to contract under the pressure of the backwash water or air.

6. The aerated biological filter backwashing device according to claim 2, characterized in that: The input component (2) comprises: A water inlet pipe (22) is arranged outside the pool body (1) and located in the packing layer of the pool body (1), with its water outlet end passing through the pool body (1) and connected to the ring pipe (31), and its water inlet end being connected to a water source pipeline of backwash water; An air inlet pipe (21) is connected to the water inlet pipe (22) and is connected to an air source pipeline for supplying air to the water inlet pipe (22); An air intake valve (23), which is detachably connected to the air intake pipe (21) and is controllably connected to the control module (4) for controlling the flow of air by automatically adjusting the valve position; A water inlet valve (24), which is detachably connected to the water inlet pipe (22) and is controllably connected to the control module (4) and is used to control the flow of backwash water by automatically adjusting the valve position; An input valve (26), arranged on the water inlet pipe (22), is controllably connected to the control module (4) and is used to input backwash water and air into the ring pipe (31); The main valve (25) is installed on the water inlet pipe (22), is control-connected to the control module (4), and is respectively interlocked with the air inlet valve (23), the input valve (26) and the water inlet valve (24).

7. The aerated biological filter backwashing device according to claim 6, characterized in that: The water inlet valve (24), the air inlet valve (23), the input valve (26) and the main valve (25) are all automatic regulating valves.

8. The aerated biological filter backwashing device according to claim 6, characterized in that: The control module (4) comprises: A control cabinet (42) is respectively connected to the air inlet valve (23), the water inlet valve (24), the main valve (25) and the input valve (26), and is used to output control signals to the air inlet valve (23), the water inlet valve (24), the main valve (25) and the input valve (26); The control terminal (41) is arranged in the control operation system of the aerated biological filter and is control-connected to the control cabinet (42) for outputting instructions to the control cabinet (42).

9. A backwashing method for an aerated biological filter backwashing device according to any one of claims 1 to 8, which backwashes suspended matter and biofilm entrained in a packing layer in an air-washing-water-washing-air-washing purge manner, characterized in that: include: S1 air wash: Outputting an opening control command to the control cabinet (42) on the control terminal (41), the control cabinet (42) outputting an opening control signal to the air inlet valve (23) and the main valve (25), the input valve (26) interlockingly opens, and air is introduced into the ring pipe (31); After the air enters the vertical pipe (32), it impacts the rotating plate (331), and the rotating plate (331) is separated from the injection hole (321) under the impact of the air pressure, so that the air is injected onto the surface of the filler; S2 Wash: Outputting instructions for closing the air inlet valve (23) and the water inlet valve (24) to the control cabinet (42), the control cabinet (42) outputting corresponding control signals to the air inlet valve (23) and the water inlet valve (24), the air inlet valve (23) being closed and the water inlet valve (24) being opened; The backwash water flows through the water inlet pipe (22) and then enters the annular pipe (31). Under the pressure of the backwash water, the backwash water impacts the rotating plate (331) and separates from the spray hole (321), so that the backwash water is sprayed onto the surface of the seasoning. S3 gas purge: The instructions for closing the water inlet valve (24) and opening the air inlet valve (23) are respectively output to the control cabinet (42), and the control cabinet (42) outputs corresponding control signals to the water inlet valve (24) and the air inlet valve (23), closing the backwash water and introducing air into the pool body (1); The backwash water, under pressure, opens the rotating sheet (331), flushes and sweeps away the moisture, remaining suspended matter and biofilm on the surface of the packing layer.

10. The backwashing method of the aerated biological filter backwashing device according to claim 9, characterized in that: Also includes: The main valve (25) is opened, and the input valve (26) and the air intake valve (23) are interlocked and opened; The air inlet valve (23) is opened and the water inlet valve (24) is interlocked and closed; The main valve (25) is closed, and the input valve (26), the water inlet valve (24), and the air inlet valve (23) are closed.

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