Sewage pretreatment device and sewage pretreatment method

Abstract

The sewage pretreatment device and sewage pretreatment method of the present invention include: a grille box, the grille box is connected to a sewage inlet pipe, and a gate is provided on the sewage inlet pipe; a grille lifting and flipping mechanism is inserted into the interior of the grille box; a grille component is mounted on the grille lifting and flipping mechanism; a grille cleaning mechanism is arranged above the grille box; a vertical pipe portion of the guide pipe is connected to the bottom of the grille box; a support pipe is connected to the horizontal pipe portion, and a sand settling filter structure is provided at the connection between the support pipe and the horizontal pipe portion, and the sand settling filter structure is arranged at an angle relative to the horizontal plane; a blocking structure is provided at the connection between the support pipe and the horizontal pipe portion, and the blocking structure is provided on the horizontal pipe portion, and a sand removal and cleaning structure is provided on the blocking structure; and a weight monitor is mounted on the grille component. The present invention is a sewage pretreatment device and sewage pretreatment method that can remove suspended matter, floating matter, and silt to the greatest extent, is easy to clean, and occupies a small area.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a sewage pretreatment device and a sewage pretreatment method. Background Art

[0002] Rural residents' living styles, diets, and hygiene habits differ from those in urban areas, resulting in small and dispersed volumes of rural sewage, with significant fluctuations in both water quality and quantity. Due to the lack of adequate maintenance of waste collection and transportation facilities, rural sewage often contains large amounts of floating and suspended solids, such as plastic bags and cigarette packs, which are difficult to biologically treat. Furthermore, due to poor maintenance of rural roads and pipe networks, large amounts of sediment accumulate in sewage pipes, resulting in high levels of inorganic matter in the sewage entering sewage treatment plants. Furthermore, due to the small scale of sewage treatment plants, which currently operate using automated control, timely cleaning is difficult, leading to the accumulation of large amounts of non-degradable floating solids and inorganic grit in the biochemical systems of sewage treatment plants. This not only reduces the organic matter content of the activated sludge, reduces biochemical and aeration efficiency, and increases the operating energy consumption of the sewage treatment plant, but also causes long-term accumulation in the living areas of the sewage treatment plant, forming compacted solids, which can cause equipment failure. At the same time, as the construction land in rural areas is becoming increasingly scarce at this stage, how to reduce the floor area of ​​the pretreatment section as much as possible and provide more effective volume for the biochemical area is also an urgent problem to be solved.

[0003] Therefore, there is an urgent need for a sewage pretreatment device that is suitable for the current situation of rural sewage treatment, can remove suspended matter, floating matter and sediment to the greatest extent, and has a high degree of automation, is easy to clean, and occupies a small area. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the technical problem solved by the present invention is to provide a sewage pretreatment device and sewage pretreatment method that can remove suspended matter, floating matter and silt to the greatest extent, and has a high degree of automation, is easy to clean and occupies a small area.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a sewage pretreatment device, comprising:

[0006] A grille box body, the grille box body is connected to the output end of the sewage inlet pipe, and a gate is provided on the output end of the sewage inlet pipe;

[0007] A grille lifting and flipping mechanism is inserted into the interior of the grille box;

[0008] A grille component, mounted on the grille lifting and flipping mechanism;

[0009] A grille cleaning mechanism is provided above the grille box;

[0010] A flow guide pipe, the flow guide pipe comprising a vertical pipe portion and a horizontal pipe portion connected to the lower end of the vertical pipe portion, the upper end of the vertical pipe portion being connected to the bottom of the grille box;

[0011] The sand settling assembly includes a supporting pipe and a sand settling filter structure. The upper end of the supporting pipe is connected to the horizontal pipe portion. The sand settling filter structure is provided at the connection between the supporting pipe and the horizontal pipe portion. The sand settling filter structure is provided at an angle relative to the horizontal plane.

[0012] The sand removal assembly includes an extension pipe, a valve, a sand removal and cleaning structure, and a liftable blocking structure. The blocking structure is arranged at the connection between the support pipe and the horizontal pipe portion, and the blocking structure is arranged on the horizontal pipe portion. The blocking structure is provided with the sand removal and cleaning structure. When the blocking structure descends into the horizontal pipe portion, the blocking structure blocks water from entering the support pipe. The extension pipe is connected to the lower end of the support pipe, and the extension pipe is provided with a valve.

[0013] a weight monitor, mounted on the grid component;

[0014] A liquid level monitor, used to monitor the liquid level inside the grille box, the liquid level inside the grille component, and the liquid level of the sewage entering the pipeline;

[0015] The controller, the gate, the grille lifting and flipping mechanism, the grille cleaning mechanism, the valve, the sand discharge and cleaning structure, the weight monitor, the liquid level monitor and the blocking structure are all connected to the controller.

[0016] Preferably, the grille component includes a grille slot and a plurality of grille meshes arranged inside the grille slot.

[0017] Preferably, the grille lifting and flipping mechanism includes: a grille guide rail and a driving component, the grille guide rail includes a vertical guide rail portion and an arc-shaped guide rail portion connected to the top of the vertical guide rail portion, the grille component is movably connected to the grille guide rail, the driving component is connected to the grille component, the driving component drives the grille component to move along the grille guide rail, and the driving component is connected to the controller.

[0018] Preferably, the grille cleaning mechanism comprises: a pulley, a guide chain is wound around the pulley, the guide chain is connected to a support frame, and a plurality of nozzles are installed on the support frame.

[0019] Furthermore, the support frame includes a main frame connected to the guide chain, a plurality of telescopic frames are provided on the main frame, and each of the main frames is provided with the nozzle.

[0020] Preferably, the sand removal and cleaning structure includes: an exhaust pipe and a flushing water pipe, and the exhaust pipe and the flushing water pipe are both arranged on the blocking structure.

[0021] Preferably, a sand collecting trough is provided at the lower end of the extension pipe.

[0022] The present invention also relates to a sewage treatment method, which uses the sewage pretreatment device. Sewage enters the sewage pretreatment device through a sewage inlet pipe for pretreatment. Substances in the sewage with a particle size larger than the mesh diameter of the grid component are intercepted inside the grid component to form grid residue; substances in the sewage with a particle size smaller than the mesh diameter of the grid component pass through the grid component and enter the grid box.

[0023] The sewage in the grille box passes through the diversion pipe. The sand filter structure makes the particles in the sewage passing through the horizontal pipe adhere to the sand filter structure. The particles in the sewage with a particle size larger than the mesh size of the sand filter structure are retained on the sand filter structure. The sewage is discharged after passing through the horizontal pipe.

[0024] The liquid level monitor sends the monitored liquid level value inside the grille box, the liquid level value inside the grille component and the liquid level value of the sewage entering the pipeline to the controller;

[0025] A weight monitor monitors the weight of the grille component;

[0026] The controller calculates an actual first liquid level value, which is the difference between the liquid level value of the sewage entering the pipeline and the liquid level value inside the grille component. When the controller determines that the actual first liquid level value is less than the preset first liquid level value, the controller controls the grille lifting and flipping mechanism to perform a slag removal operation on the grille component.

[0027] When the controller determines that the actual weight of the grille component is greater than the preset weight of the grille component, the controller controls the grille lifting and flipping mechanism to perform a slag removal operation on the grille component;

[0028] The slag cleaning operation comprises the following steps:

[0029] Step 1) closing the gate;

[0030] Step 2) the controller controls the grid lifting and flipping mechanism to lift and flip the grid component, and the grid residue in the grid component is dumped out;

[0031] Step 3) the controller controls the grille cleaning mechanism to flush the grille component;

[0032] Step 4) The controller controls the grille lifting and flipping mechanism to drive the grille component to return to the grille box;

[0033] Step 5) opening the gate;

[0034] When the controller determines that the liquid level value inside the grid box monitored by the liquid level monitor is greater than the preset liquid level value inside the grid box, the controller controls the sand discharge component to start the sand discharge operation;

[0035] The controller calculates an actual second liquid level value, which is the difference between the liquid level value of the grid box and the liquid level value inside the grid component. When the controller determines that the actual second liquid level value is less than the preset second liquid level value, the controller controls the sand discharge component to start the sand discharge operation.

[0036] The sand removal operation comprises the following steps:

[0037] Step 1) the controller controls the blocking structure to descend, and the controller controls the valve to open;

[0038] Step 2) The controller controls the sand removal and cleaning structure to flush the sand filtering structure.

[0039] Preferably, the grille component includes a grille slot and a grille mesh arranged inside the grille slot;

[0040] When the controller determines that the number of times the grille component performs the slag cleaning operation reaches the preset maximum number of times the grille component performs the slag cleaning operation, the controller activates a grille mesh replacement prompt and performs the grille mesh replacement operation;

[0041] When the controller determines that the liquid level value inside the grille component in the grille box after flushing reaches the preset liquid level value corresponding to the replacement of the grille mesh, the controller activates the grille mesh replacement prompt and performs the grille mesh replacement operation;

[0042] When the controller determines that the time interval between two adjacent cleanings of the grille component is less than the preset time interval for cleaning the grille component, the controller activates a grille mesh replacement prompt and performs the grille mesh replacement operation;

[0043] The grid replacement operation includes the following steps:

[0044] Step 1) closing the gate;

[0045] Step 2) the controller controls the grille lifting and flipping mechanism to lift the grille component, and then replaces the grille mesh in the grille component;

[0046] Step 3) The controller controls the grille lifting and flipping mechanism to drive the grille component to return to the grille box;

[0047] Step 4) Open the gate.

[0048] As described above, the sewage pretreatment device and sewage pretreatment method of the present invention have the following beneficial effects:

[0049] The sewage pretreatment device of the present invention can realize the slag removal and sand settling of rural sewage. Through the use of the sewage pretreatment device, the problem of the lack of existing rural sewage pretreatment equipment can be solved, the inorganic matter in rural sewage can be separated in the pretreatment stage, the treatment load of the subsequent biochemical stage can be reduced, and the management pressure of sewage treatment can be reduced. At the same time, since the sewage pretreatment device of the present invention adopts automatic control, the labor intensity is reduced, and the simple pretreatment of rural sewage is realized. The present invention is a sewage pretreatment device and sewage pretreatment method that can remove suspended matter, floating matter and sediment to the greatest extent, and has a high degree of automation, is easy to clean, and occupies a small area. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a front view structural schematic diagram of the sewage pretreatment device of this embodiment in which the grid component is located in the grid box.

[0051] Figure 2 show Figure 1 Schematic diagram of the enlarged structure at A.

[0052] Figure 3 It shows a front view structural schematic diagram of the sewage pretreatment device of this embodiment after the grille component leaves the grille box and is turned over.

[0053] Figure 4 Shown is a schematic top view of the structure of the grille mesh of this embodiment being arranged in the grille slot.

[0054] Figure 5 It shows a side structural schematic diagram of the sewage pretreatment device of this embodiment in which the grid component is located in the grid box.

[0055] Figure 6 Display as Figure 5 Schematic diagram of the enlarged structure at B.

[0056] Figure 7 It shows a structural schematic diagram of the grid cleaning mechanism of the sewage pretreatment device of this embodiment in an initial state.

[0057] Figure 8 It is a schematic structural diagram of the sewage pretreatment device of this embodiment after the grid cleaning mechanism is lowered.

[0058] Figure 9 Shown is a structural schematic diagram of the telescopic bracket of the grid cleaning mechanism of the sewage pretreatment device of this embodiment after extension.

[0059] Figure 10 Shown is a schematic diagram of the sewage pretreatment device of this embodiment under the control of the controller.

[0060] Explanation of Figure Numbers

[0061] 100 Grille Box

[0062] 110 diversion tube

[0063] 111 vertical pipe

[0064] 112 horizontal pipe

[0065] 200 Sewage enters the pipeline

[0066] 210 output terminal

[0067] 300 Grille Parts

[0068] 310 Grille Slot

[0069] 320 Grille

[0070] 410 grille lifting and flipping mechanism

[0071] 411 Grille Rail

[0072] 4111 Vertical guide rail

[0073] 4112 curved guide rail

[0074] 412 drive components

[0075] 420 grille cleaning mechanism

[0076] 421 Pulley

[0077] 422 guide chain

[0078] 423 support frame

[0079] 4231 main frame

[0080] 4232 telescopic frame

[0081] 424 nozzle

[0082] 510 support pipe

[0083] 520 sand filter structure

[0084] 530 filter

[0085] 610 extension fitting

[0086] 620 valve

[0087] 630 sand removal and cleaning structure

[0088] 631 Exhaust Pipe

[0089] 632 Flushing pipes

[0090] 640 Blocking Structure

[0091] 650 sand collecting trough

[0092] 651 slag extraction hole

[0093] 652 air intake

[0094] 653 slag filter plate

[0095] 710 Weight Monitor

[0096] 720 Liquid Level Monitor

[0097] 721 Grille Box Internal Liquid Level Monitor

[0098] 722 Grille component internal liquid level monitor

[0099] 723 Sewage entering pipeline level monitor

[0100] 800 Controller DETAILED DESCRIPTION

[0101] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0102] Please refer to the accompanying drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no technical substantive significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0103] like Figures 1 to 10 As shown, the sewage pretreatment device of this embodiment includes:

[0104] The grille box 100 is an open box located underground. The grille box 100 is connected to the output end 210 of the sewage inlet pipe 200. A gate is provided on the output end 210 of the sewage inlet pipe 200.

[0105] The grid lifting and flipping mechanism 410 is inserted into the interior of the grid box 100; the grid component 300 is used to separate the inorganic matter initially screened out during the pretreatment process from the sewage;

[0106] The grille component 300 is mounted on the grille lifting and flipping mechanism 410;

[0107] The grille cleaning mechanism 420 is disposed above the grille box 100;

[0108] The flow guide pipe 110 includes a vertical pipe portion 111 and a horizontal pipe portion 112 connected to the lower end of the vertical pipe portion 111. The upper end of the vertical pipe portion 111 is connected to the bottom of the grille box 100.

[0109] The sand settling assembly includes a support pipe 510 and a sand settling filter structure 520. The upper end of the support pipe 510 is connected to the horizontal pipe portion 112. The sand settling filter structure 520 is set at the connection between the support pipe 510 and the horizontal pipe portion 112. The sand settling filter structure 520 is set at an angle relative to the horizontal plane.

[0110] The sand removal assembly includes an extension pipe 610, a valve 620, a sand removal and cleaning structure 630, and a liftable blocking structure 640. The blocking structure 640 is disposed at the connection between the support pipe 510 and the horizontal pipe portion 112. The blocking structure 640 is disposed on the horizontal pipe portion 112 and is provided with the sand removal and cleaning structure 630. When the blocking structure 640 descends into the horizontal pipe portion 112, the blocking structure 640 blocks water from entering the support pipe 510. The extension pipe 610 is connected to the lower end of the support pipe 510 and is provided with a valve 620.

[0111] A weight monitor 710 is mounted on the grid member 300;

[0112] The liquid level monitor 720 is used to monitor the liquid level value inside the grille box 100, the liquid level value inside the grille component 300, and the liquid level value of the sewage entering the pipeline 200; the liquid level monitor 720 includes a liquid level monitor 721 inside the grille box, a liquid level monitor 722 inside the grille component, and a liquid level monitor 723 for sewage entering the pipeline; the liquid level monitor 721 inside the grille box is used to monitor the liquid level value inside the grille box 100, the liquid level monitor 722 inside the grille component is used to monitor the liquid level value inside the grille component 300, and the liquid level monitor 723 for sewage entering the pipeline is used to monitor the liquid level value of sewage entering the pipeline 200.

[0113] The controller 800 , the gate, the grille lifting and flipping mechanism 410 , the grille cleaning mechanism 420 , the valve 620 , the sand discharge and cleaning structure 630 , the weight monitor 710 , the liquid level monitor 720 and the blocking structure 640 are all connected to the controller 800 .

[0114] In the sewage pretreatment device of the present invention, after the sewage enters the sewage pretreatment device through the inlet gate, it is filtered through the grille mesh 320 of the grille component 300, and large particles of solids are retained in the grille mesh 320. The sewage flows out from the sieve holes of the grille mesh 320 into the grille box 100 and forms a certain liquid level height. Thereafter, the sewage passes through the grit settling assembly through the guide pipe 110 at the bottom of the grille box 100, completes the sand and water separation and flows out; when the controller 800 determines that the actual first liquid level value is less than the preset first liquid level value or the actual weight of the grille component 300 is greater than the preset weight of the grille component 300, the controller 800 closes the gate, and the controller 800 controls the grille lifting and flipping mechanism 410 to lift and flip the grille component 300, and then dumps the liquid in the grille component 300 by gravity. The screen residue is dumped into the residue-water separation area; the controller 800 controls the screen cleaning mechanism 420 to flush the screen component 300, and the controller 800 controls the screen lifting and flipping mechanism 410 to drive the screen component 300 to reset to the screen box 100 and open the gate; when the controller 800 determines that the liquid level value inside the screen box 100 monitored by the liquid level monitor 720 is greater than the preset liquid level value inside the screen box 100 or the controller 800 determines that the actual second liquid level value is less than the preset second liquid level value, the controller 800 controls the sand discharge component to start the sand discharge operation, and the sand discharge operation is: the controller 800 controls the blocking structure 640 to descend, the controller 800 controls the valve 620 to open, and then the controller 800 controls the sand discharge cleaning structure 630 to flush the sand settling filter structure 520.

[0115] The sewage pretreatment device of the present invention can realize the slag removal and sand settling of rural sewage. Through the use of the sewage pretreatment device, the problem of the lack of existing rural sewage pretreatment equipment can be solved, the inorganic matter in rural sewage can be separated in the pretreatment stage, the processing load of the subsequent biochemical stage can be reduced, and the management pressure of sewage treatment can be reduced. At the same time, since the sewage pretreatment device of the present invention adopts automatic control, the intensity of manual labor is reduced, and simple pretreatment of rural sewage is realized.

[0116] The present invention provides a sewage pretreatment device and a sewage pretreatment method which can remove suspended matter, floating matter and sediment to the greatest extent, and has a high degree of automation, is easy to clean and occupies a small area.

[0117] The grille member 300 includes a grille slot 310 and a plurality of replaceable grille nets 320 disposed within the grille slot 310. The grille slot 310 serves as a support, and the replaceable grille nets 320 can be easily removed from the grille slot 310. In this embodiment, the grille nets 320 are inserted into the grille slot 310.

[0118] The grid lifting and flipping mechanism 410 includes a grid guide rail 411 and a drive component 412. The grid guide rail 411 includes a vertical guide rail portion 4111 and a curved guide rail portion 4112 connected to the top of the vertical guide rail portion 4111. The grid member 300 is movably connected to the grid guide rail 411. The drive component 412 is connected to the grid member 300 and drives the grid member 300, causing the grid member 300 to move along the grid guide rail 411. The drive component 412 is connected to the controller 800. The drive component 412 in the grid lifting and flipping mechanism 410 drives the grid slot 310, causing the grid slot 310 to move along the grid guide rail 411. Driven by the drive component 412, the grid member 300 dumps the screen residue into the residue-water separation area by gravity. This structure is simple and easy to control. The curved guide rail portion 4112 in this embodiment is an upwardly protruding structure.

[0119] The grille cleaning mechanism 420 includes a pulley 421, around which a guide chain 422 is wound. The guide chain 422 is connected to a support frame 423, on which multiple nozzles 424 are mounted. This structure allows all nozzles 424 to move to the side of the grille member 300, facilitating the nozzles 424 to flush the grille member 300. In this embodiment, the grille cleaning mechanism 420 uses a backwashing method to flush the grille member 300.

[0120] In this embodiment, there are two guide chains 422 and two pulleys 421, forming a double guide chain pulley 421 system. The double guide chain pulley 421 system can complete the transmission of the high-pressure nozzle 424 to the specified position under operating conditions, and keep the nozzles 424 at a suitable distance. The high-pressure fine water mist nozzle 424 adopts a fine water mist nozzle 424 with H=60m, so that the cleaning water is evenly sprayed on the grille mesh 320, and the cleaning is completed through its high-pressure characteristics; the magnetic coupling device keeps the position of the grille cleaning system fixed in the stopped state through the attraction of the magnet; the water pump and piping system are used to provide a source of cleaning water, and the clean water is preferably the tail water treated by the sewage treatment station. This device adopts PPR pipe or steel pipe, and the device is lined with a plastic hose.

[0121] The support frame 423 includes a main frame 4231 connected to the guide chain 422. The main frame 4231 is provided with a plurality of telescopic frames 4232, each of which is provided with the aforementioned nozzle 424. By driving the telescopic frames 4232 to extend and retract, the spacing between the nozzles 424 can be adjusted, thereby improving the efficiency of flushing the grille member 300. The high-pressure nozzles 424 provide a complete cleaning of the grille member 300 through the hydraulic cleaning action of the high-pressure nozzles 424.

[0122] The sand removal and cleaning structure 630 includes an exhaust pipe 631 and a flushing water pipe 632, both of which are mounted on the blocking structure 640. The exhaust pipe 631 and the flushing water pipe 632 operate simultaneously to flush the sand filter structure 520. The sand removal and cleaning structure 630 flushes the sand filter structure 520 using a backwashing method.

[0123] In this embodiment, the blocking structure 640 is a gate valve. The sand filter structure 520 includes three screens with decreasing apertures arranged sequentially from top to bottom. A filter 530 is provided below the sand filter structure 520. The valve 620 is an electrically controlled butterfly valve.

[0124] The lower end of the extension pipe 610 is provided with a sand collecting trough 650. The exhaust pipe 631 and the flushing water pipe 632 backwash the sand filter structure 520 to flush the inorganic matter accumulated at the bottom of the sand discharge system and the inorganic matter accumulated on the surface of the screen into the sand collecting trough 650. The upper end of the sand collecting trough 650 is provided with a slag lifting hole 651 and an air inlet 652. The interior of the sand collecting trough 650 is provided with a slag retaining filter plate 653. The airflow released by the blower enters the sand collecting trough 650 through the air inlet 652. The airflow discharged from the air inlet 652 passes through the slag retaining filter plate 653 and lifts the sand and gravel in the sand collecting trough 650 through the slag lifting hole 651 to the solid-liquid separation area on the ground, thus achieving air lift slag discharge. This device uses air lift sand discharge to lift the solids accumulated in the sand to the solid-liquid separation area on the ground.

[0125] In this embodiment, the aperture of the grid mesh 320 is smaller than the particle size of the screen residue, and the aperture of the grid mesh 320 is 5 mm or 10 mm.

[0126] The openings on the screen can be 20 mesh, 100 mesh, 200 mesh, 50 mesh or 150 mesh; the screen can be a combination of 20 mesh: 100 mesh: 200 mesh or 50 mesh: 150 mesh.

[0127] The water pump used by the grille cleaning mechanism 420 and the water pump used by the sand discharge cleaning structure 630 can be the same water pump. The controller 800 is set at different priorities and starts when the grille cleaning mechanism 420 and the sand discharge cleaning structure 630 each reach the set value; when the grille cleaning mechanism 420 and the sand discharge cleaning structure 630 reach the set value at the same time, the sand discharge cleaning structure 630 is backwashed first.

[0128] The water outlet at the bottom of the grille box 100 is mainly used to collect the sewage separated by the grille slot 310 and the replaceable grille mesh 320 in the grille slot 310, maintain the liquid level in the grille box 100, and ensure the smooth progress of subsequent processing links; the water outlet calculation method adopts the small hole outflow calculation method.

[0129] The grille slot 310 is preferably made of SS304 stainless steel, and its main function is to provide support and fixing components for the replaceable grille mesh 320, and also serves as a fixing component for the liquid level monitor 720.

[0130] The grid mesh 320 is made of PVDF lined with steel wire. The shape of the openings of the grid mesh 320 is not limited and can be ribbed, rectangular, circular, hexagonal, etc. When the openings of the grid mesh 320 are circular, the aperture of the openings of the grid mesh can be 5-20 mm according to the process requirements.

[0131] The sewage that has undergone preliminary solid-liquid separation by the grille component 300 enters the subsequent guide pipe 110 along the water outlet hole in the middle of the grille box 100 for sand and water separation. The screen is set to be tilted downward, and the angle between the screen and the horizontal plane is 20-25°. The screen is set at 22.5° against the water flow direction. Through the action of the screen, solids with particle size larger than the screen diameter enter the filter 530 under the screen, and the sewage enters the subsequent sand collecting trough 650 through the screen to facilitate the lifting of sand and gravel in the sand collecting trough 650.

[0132] The present invention also relates to a sewage treatment method, which uses a sewage pretreatment device. Sewage enters the sewage pretreatment device through a sewage inlet pipe 200 for pretreatment. Substances in the sewage with a particle size larger than the mesh diameter of a grid component 300 are intercepted inside the grid component 300 to form screen residue. Substances in the sewage with a particle size smaller than the mesh diameter of the grid component 300 pass through the grid component 300 and enter the grid box 100.

[0133] When the water level in the screen box 100 reaches a certain height, the sewage pre-treated by the screen mesh 320 is subjected to the hydrostatic pressure. The sewage in the screen box 100 passes through the diversion pipe 110. The sand filter structure 520 causes the particles in the sewage passing through the horizontal pipe portion 112 to adhere to the sand filter structure 520. The particles in the sewage with a particle size larger than the mesh size of the sand filter structure 520 are trapped in the sand filter structure 520. The sewage passes through the horizontal pipe portion 112 and is discharged.

[0134] The liquid level monitor 720 sends the monitored liquid level values ​​inside the grille box 100 , the liquid level value inside the grille component 300 , and the liquid level value of the sewage entering the pipe 200 to the controller 800 ;

[0135] The weight monitor 710 monitors the weight of the grille member 300;

[0136] The controller 800 calculates an actual first liquid level value, which is the difference between the liquid level of the sewage entering the pipe 200 and the liquid level inside the grille member 300. When the controller 800 determines that the actual first liquid level value is less than the preset first liquid level value, the controller 800 controls the grille lifting and flipping mechanism 410 to perform a slag removal operation on the grille member 300.

[0137] When the controller 800 determines that the actual weight of the grid component 300 is greater than the preset weight of the grid component 300, the controller 800 controls the grid lifting and flipping mechanism 410 to perform a slag removal operation on the grid component 300;

[0138] The slag cleaning operation includes the following steps:

[0139] Step 1) closing the gate;

[0140] Step 2) The controller 800 controls the grid lifting and flipping mechanism 410 to lift and flip the grid component 300, and the grid residue in the grid component 300 is dumped out;

[0141] Step 3) The controller 800 controls the grille cleaning mechanism 420 to rinse the grille member 300;

[0142] Step 4) The controller 800 controls the grille lifting and flipping mechanism 410 to drive the grille component 300 to return to the grille box 100;

[0143] Step 5) Open the gate;

[0144] When the controller 800 determines that the liquid level value inside the grid box 100 monitored by the liquid level monitor 720 is greater than the preset liquid level value inside the grid box 100, the controller 800 controls the sand discharge component to start the sand discharge operation;

[0145] The controller 800 calculates an actual second liquid level value, which is the difference between the liquid level value of the grid box 100 and the liquid level value inside the grid member 300. When the controller 800 determines that the actual second liquid level value is less than the preset second liquid level value, the controller 800 controls the sand discharge assembly to start the sand discharge operation.

[0146] The sand removal operation includes the following steps:

[0147] Step 1) The controller 800 controls the blocking structure 640 to descend, and the controller 800 controls the valve 620 to open;

[0148] Step 2) The controller 800 controls the sand removal and cleaning structure 630 to flush the sand filtering structure 520 .

[0149] The sewage pretreatment device of the present invention can solve the problems of large fluctuations in water quality and quantity, large amounts of suspended matter and floating objects, and large amounts of inorganic mud and sand and other particles in rural sewage. At the same time, taking into account the actual operation and maintenance status of rural sewage treatment facilities, the present invention also takes into account the problem of improving the degree of automation to reduce operation and maintenance pressure and reducing the area occupied by the pretreatment section.

[0150] Furthermore, the grille component 300 includes a grille slot 310 and a replaceable grille net 320 disposed inside the grille slot 310;

[0151] When the controller 800 determines that the number of times the grille component 300 performs the slag cleaning operation reaches the preset maximum number of times the grille component 300 performs the slag cleaning operation, the controller 800 starts the grille mesh 320 replacement prompt and performs the grille mesh 320 replacement operation;

[0152] When the controller 800 determines that the liquid level value inside the grille member 300 in the grille box 100 after flushing reaches the preset liquid level value corresponding to the replacement of the grille mesh 320, the controller 800 starts the grille mesh 320 replacement prompt and performs the grille mesh 320 replacement operation;

[0153] When the controller 800 determines that the time interval between two adjacent cleanings of the grille component 300 is less than the preset time interval for cleaning the grille component 300, the controller 800 activates a reminder to replace the grille mesh 320 and performs a replacement operation of the grille mesh 320;

[0154] The replacement operation of the grid mesh 320 includes the following steps:

[0155] Step 1) closing the gate;

[0156] Step 2) The controller 800 controls the grille lifting and flipping mechanism 410 to lift the grille component 300 and replace the grille mesh 320 in the grille component 300;

[0157] Step 3) The controller 800 controls the grille lifting and flipping mechanism 410 to drive the grille component 300 to return to the grille box 100;

[0158] Step 4) Open the gate.

[0159] The grid mesh 320 replacement operation is used to update the grid mesh 320 after the grid mesh 320 completes a certain frequency of slag discharge and cleaning and reaches the end of its service life, thereby ensuring the effectiveness of the sewage pretreatment device.

[0160] In this embodiment, a slag filter plate is provided in the sand collecting tank 650. The slag filter plate prevents large particles from entering the air supply pipeline during the solid-liquid separation process and causing a certain blockage of the air supply pipeline, making the maintenance of the air supply pipeline more convenient.

[0161] The sewage pretreatment device of the present invention has a simple structure, low cost, low energy consumption, and can automatically control and conveniently clean sewage. The sewage pretreatment method of the present invention is suitable for rural sewage treatment projects; the sewage pretreatment device of the present invention can effectively separate solid particles with a particle size of more than 100 microns, thereby reducing the treatment pressure of the subsequent biochemical stage.

[0162] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0163] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A sewage pretreatment device, characterized in that: include: A grille box (100), the grille box (100) being in communication with an output end (210) of a sewage inlet pipe (200), and a gate being provided on the output end (210) of the sewage inlet pipe (200); A grille lifting and flipping mechanism (410) is inserted into the interior of the grille box (100); The grid component (300) is mounted on the grid lifting and turning mechanism (410); after the sewage enters the sewage pretreatment device through the gate, it is filtered through the grid mesh (320) of the grid component (300), large particles of solids are trapped in the grid mesh (320), and the sewage flows out from the sieve holes of the grid mesh (320) into the grid box (100); A grille cleaning mechanism (420) is disposed above the grille box (100); A flow guide pipe (110), the flow guide pipe (110) comprising a vertical pipe portion (111) and a horizontal pipe portion (112) connected to the lower end of the vertical pipe portion (111), the upper end of the vertical pipe portion (111) being in communication with the bottom of the grille box (100); A sand settling assembly comprises a supporting pipe (510) and a sand settling filter structure (520), wherein the upper end of the supporting pipe (510) is connected to the horizontal pipe portion (112), the sand settling filter structure (520) is provided at the connection between the supporting pipe (510) and the horizontal pipe portion (112), and the sand settling filter structure (520) is provided at an inclination relative to a horizontal plane; A sand removal assembly comprises an extension pipe (610), a valve (620), a sand removal and cleaning structure (630), and a liftable blocking structure (640). The blocking structure (640) is arranged at the connection between the support pipe (510) and the horizontal pipe portion (112). The blocking structure (640) is arranged on the horizontal pipe portion (112). The sand removal and cleaning structure (630) is provided on the blocking structure (640). When the blocking structure (640) descends into the horizontal pipe portion (112), the blocking structure (640) blocks water from entering the support pipe (510). The extension pipe (610) is connected to the lower end of the support pipe (510). The extension pipe (610) is provided with a valve (620). A weight monitor (710) is mounted on the grid component (300); a liquid level monitor (720) for monitoring the liquid level inside the grid box (100), the liquid level inside the grid component (300), and the liquid level of the sewage entering the pipeline (200); A controller (800), the gate, the grille lifting and flipping mechanism (410), the grille cleaning mechanism (420), the valve (620), the sand discharge and cleaning structure (630), the weight monitor (710), the liquid level monitor (720) and the blocking structure (640) are all connected to the controller (800); The sand removal and cleaning structure (630) comprises: an exhaust pipe (631) and a flushing water pipe (632), both of which are arranged on the blocking structure (640); the sand filter structure (520) comprises three screens with decreasing apertures arranged in sequence from top to bottom; a filter (530) is provided below the sand filter structure (520); a sand collecting trough (650) is provided at the lower end of the extension pipe (610), and the exhaust pipe (631) and the flushing water pipe (632) are used to pass the sand filter structure (520) through the sand collecting trough (650). Flushing is performed, and the inorganic matter accumulated at the bottom of the sand discharge component and the inorganic matter accumulated on the surface of the screen are flushed to the sand collecting trough (650). The upper end of the sand collecting trough (650) is provided with a slag lifting hole (651) and an air inlet (652). The inside of the sand collecting trough (650) is provided with a slag blocking filter plate (653). The airflow released by the blower enters the sand collecting trough (650) through the air inlet (652). The airflow discharged from the air inlet (652) passes through the slag blocking filter plate (653) and lifts the sand and gravel in the sand collecting trough (650) through the slag lifting hole (651) to the solid-liquid separation area on the ground.

2. The sewage pretreatment device according to claim 1, characterized in that: The grille component (300) includes a grille slot (310) and a plurality of grille meshes (320) arranged inside the grille slot (310).

3. The sewage pretreatment device according to claim 1, characterized in that: The grille lifting and flipping mechanism (410) comprises: a grille guide rail (411) and a driving component (412); the grille guide rail (411) comprises a vertical guide rail portion (4111) and an arc-shaped guide rail portion (4112) connected to the top of the vertical guide rail portion (4111); the grille component (300) is movably connected to the grille guide rail (411); the driving component (412) is connected to the grille component (300); the driving component (412) drives the grille component (300) to move along the grille guide rail (411); and the driving component (412) is connected to the controller (800).

4. The sewage pretreatment device according to claim 1, characterized in that: The grille cleaning mechanism (420) comprises a pulley (421), a guide chain (422) is wound around the pulley (421), the guide chain (422) is connected to a support frame (423), and a plurality of nozzles (424) are installed on the support frame (423).

5. A sewage treatment method, using the sewage pretreatment device according to any one of claims 1 to 4, characterized in that: The sewage enters the sewage pretreatment device through the sewage inlet pipe (200) for pretreatment, and the particles in the sewage with a diameter larger than the mesh diameter of the grid component (300) are intercepted inside the grid component (300) to form screen residue; Materials in the sewage with a particle size smaller than the mesh diameter of the grid component (300) pass through the grid component (300) and enter the grid box (100); the sewage in the grid box (100) passes through the diversion pipe (110); the sand filter structure (520) causes particles in the sewage passing through the horizontal pipe portion (112) to adhere to the sand filter structure (520), and particles in the sewage with a particle size larger than the mesh diameter of the sand filter structure (520) are retained on the sand filter structure (520), and the sewage is discharged after passing through the horizontal pipe portion (112); the liquid level monitor (720) sends the monitored liquid level value inside the grid box (100), the liquid level value inside the grid component (300), and the liquid level value of the sewage entering the pipeline (200) to the controller (800); A weight monitor (710) monitors the weight of the grid component (300); The controller (800) calculates an actual first liquid level value, the first liquid level value being the difference between the liquid level value of sewage entering the pipe (200) and the liquid level value inside the grid component (300); when the controller (800) determines that the actual first liquid level value is less than a preset first liquid level value, the controller (800) controls the grid lifting and flipping mechanism (410) to perform a slag removal operation on the grid component (300); When the controller (800) determines that the actual weight of the grid component (300) is greater than the preset weight of the grid component (300), the controller (800) controls the grid lifting and flipping mechanism (410) to perform a slag removal operation on the grid component (300); The slag cleaning operation comprises the following steps: Step 1) closing the gate; Step 2) the controller (800) controls the grid lifting and flipping mechanism (410) to lift and flip the grid component (300), and the grid residue in the grid component (300) is dumped out; Step 3) the controller (800) controls the grille cleaning mechanism (420) to flush the grille component (300); Step 4) the controller (800) controls the grille lifting and flipping mechanism (410) to drive the grille component (300) to return to the grille box (100); Step 5) opening the gate; When the controller (800) determines that the liquid level value inside the grid box (100) monitored by the liquid level monitor (720) is greater than a preset liquid level value inside the grid box (100), the controller (800) controls the sand discharge component to start a sand discharge operation; The controller (800) calculates an actual second liquid level value, the second liquid level value being the difference between the liquid level value of the grid box (100) and the liquid level value inside the grid component (300); when the controller (800) determines that the actual second liquid level value is less than a preset second liquid level value, the controller (800) controls the sand discharge component to start a sand discharge operation; The sand removal operation comprises the following steps: Step 1) The controller (800) controls the blocking structure (640) to descend, and the controller (800) controls the valve (620) to open; Step 2) The controller (800) controls the sand removal and cleaning structure (630) to flush the sand settling and filtering structure (520).

6. The sewage treatment method according to claim 5, characterized in that: The grille component (300) comprises a grille slot (310) and a grille net (320) disposed inside the grille slot (310); when the controller (800) determines that the number of times the grille component (300) performs a slag cleaning operation reaches a preset maximum number of times the grille component (300) performs a slag cleaning operation, the controller (800) activates a grille net (320) replacement prompt and performs a grille net (320) replacement operation; When the controller (800) determines that the liquid level value inside the grille component (300) after flushing and in the grille box (100) reaches a preset liquid level value corresponding to replacement of the grille net (320), the controller (800) activates a grille net (320) replacement prompt and performs the grille net (320) replacement operation; When the controller (800) determines that the time interval between two adjacent cleanings of the grille component (300) is less than a preset time interval for cleaning the grille component (300), the controller (800) activates a grille net (320) replacement prompt and performs a grille net (320) replacement operation; The grid mesh (320) replacement operation includes the following steps: Step 1) closing the gate; Step 2) the controller (800) controls the grille lifting and flipping mechanism (410) to lift the grille component (300), and then replaces the grille mesh (320) in the grille component (300); Step 3) the controller (800) controls the grille lifting and flipping mechanism (410) to drive the grille component (300) to return to the grille box (100); Step 4) Open the gate.

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