A sewage solid-liquid separation device

Abstract

The present invention provides a sewage solid-liquid separation device, which belongs to the technical field of sewage treatment, and includes a primary sedimentation tank, a first pipeline, a separation box assembly, a second pipeline, an air collection assembly, a water replenishment backwashing pipeline, an oil discharge pipeline and a PLC control system; the two ends of the first pipeline are respectively connected to the primary sedimentation tank and the separation box assembly; the second pipeline, the water replenishment backwashing pipeline, and the oil discharge pipeline are respectively connected to the separation box assembly; the sewage containing solid impurities and oil pollution first enters the interior of the primary sedimentation tank, and is pumped into the interior of the separation box assembly after preliminary neutralization and precipitation. Under the continuous impact of the airflow, the oil pollution in the separation box assembly will float on the sewage surface, and the solid particles in the separation box assembly will become smaller. The present invention performs aeration in different areas of the separation box body, thereby improving the efficiency of air flotation, alternately aerating near the two side walls of the separation box body, accelerating the discharge speed of the oil pollution, and using a cutter to reduce the particle size of the solid, thereby reducing the difficulty of sludge treatment.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a sewage solid-liquid separation device. Background Art

[0002] Sewage treatment refers to the removal of harmful substances in water bodies. A series of physical, chemical, biological and other treatment processes are carried out on sewage to remove or transform the harmful substances therein so that it meets the standards for discharge or reuse. Sewage includes domestic sewage, industrial sewage and rainfall sewage. Industrial sewage contains a large amount of oil pollution due to the use of raw materials and auxiliary materials, processing and equipment maintenance, etc., and cannot be directly discharged or recycled. It needs to be purified. Since sewage contains a large amount of solid impurities, the existing technology uses different processes to treat sewage containing a large amount of oil pollution and solid impurities. First, the solid impurities are treated and then the oil pollution is removed, or the oil pollution is cleaned and then the solid impurities are removed. As a result, this type of sewage treatment equipment occupies a large area, the process is complicated, the equipment cost is high, and the maintenance is extremely inconvenient. In the flotation process, fixed-point area aeration is often used, resulting in uneven distribution of bubbles in the water body. Part of the water body close to the aeration area can fully contact the bubbles, while the water body far away from the aeration area lacks bubble contact, which will reduce the contact area between the entire water body and the bubbles, and also reduce the contact probability between the bubbles and the suspended matter, affecting the flotation efficiency, and it takes a long time to treat the oil pollution.

[0003] The patent document with the announcement number CN117303489A discloses a sequential air flotation device, including a shell, the shell is provided with a water inlet and a water outlet, an aerator is installed on the side of the shell near the upper water inlet, the shell is installed with an air dissolving pump, the shell is fixedly connected with a reflux pipe connected with the air dissolving pump, the interior of the shell is fixedly connected with a scraper table, a baffle and an overflow weir, the overflow weir is close to the water outlet of the shell, the shell is fixedly connected with a motor, the interior of the shell is fixedly connected with a sealing shell, the interior of the sealing shell is installed with an electric push rod, the telescopic end of the electric push rod is slidably connected with the sealing shell, and the telescopic end of the electric push rod is rotatably connected with a push plate. The invention drives the push plate to move through the telescopic end of the electric push rod, so that the push plate pushes the scum accumulated in the lower layer, disperses the accumulated scum, and pushes away all the scum when the scraper plate pushes the scum. Although the invention has achieved certain positive effects in the treatment of oil pollution, the oil pollution treatment process of the invention is complicated and inconvenient to repair and maintain. It also cannot take into account the treatment of large particles of solids, and the fixed area aeration affects the flotation efficiency and requires a long time to treat the oil pollution. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a sewage solid-liquid separation device, which effectively solves the problem that in the prior art, sewage containing a large amount of oil and solid impurities is often treated with different processes, first treating the solid impurities and then removing the oil, or first cleaning the oil and then removing the solid impurities, resulting in uneven distribution of bubbles in the water body, part of the water body close to the aeration area can fully contact the bubbles, while the water body far away from the aeration area lacks bubble contact, which will reduce the contact area between the entire water body and the bubbles, and also reduce the contact probability between the bubbles and the suspended matter, affecting the flotation efficiency, and requiring a longer time to treat the oil.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sewage solid-liquid separation device, comprising a primary sedimentation tank, a first pipeline, a separation box assembly, a second pipeline, an air collection assembly, a water replenishment backwashing pipeline, an oil discharge pipeline and a PLC control system; one end of the first pipeline is connected to the outlet end of the primary sedimentation tank, and the other end of the first pipeline is connected to the separation box assembly; the second pipeline is connected to the separation box assembly; the water replenishment backwashing pipeline is connected to the separation box assembly, and the oil discharge pipeline is connected to the separation box assembly; sewage containing solid impurities and oil first enters the primary sedimentation tank, and after preliminary neutralization and precipitation, it is pumped into the interior of the separation box assembly through the first pipeline, and the air collection assembly inputs pressurized air into the interior of the separation box assembly. Under the continuous impact of the airflow, the oil in the separation box assembly will float on the sewage surface, and the solid particles in the separation box assembly will become smaller. The liquid level of the separation box assembly is raised through the water replenishment backwashing pipeline, and the oil in the separation box assembly is discharged through the oil discharge pipeline.

[0006] Preferably, the first pipeline includes a first solenoid valve, a first Y-type filter, a first booster pump and a liquid inlet stop valve connected in sequence, and the second pipeline includes a second solenoid valve and a second Y-type filter, and the second Y-type filter is located at the rear end of the second solenoid valve.

[0007] Preferably, the separation box assembly includes a separation box body, a liquid level sensor, an observation window, a first filter plate assembly, a second filter plate assembly and a third filter plate assembly, the liquid level sensor is located at the front of the separation box body and is connected thereto, the observation window is located at the front of the separation box body, the first filter plate assembly, the second filter plate assembly and the third filter plate assembly are all located inside the separation box body, the first filter plate assembly, the second filter plate assembly and the third filter plate assembly are all provided with filter holes and cutters, the first filter plate assembly and the bottom and side walls of the separation box body form area A, the first filter plate assembly, the second filter plate assembly and the separation box body form area B, the second filter plate assembly, the third filter plate assembly and the separation box body form area C, and the third filter plate assembly and the top side wall of the separation box body form area D.

[0008] Preferably, a separation box water inlet is provided on one side of the separation box body, a separation box water outlet and a separation box water replenishment port are provided on the other side of the separation box body, the separation box water replenishment port is located at the top of the separation box water outlet, and separation box oil drain ports are provided on both sides of the separation box body.

[0009] Preferably, the gas collecting assembly includes an gas collecting box support assembly, a first electric push rod assembly, a second electric push rod assembly, an gas collecting box assembly and an air pipe, the gas collecting box support assembly includes a base and a support plate, the support plate is a U-shaped plate, the support plate is located on the top of the base and fixedly connected thereto, one end of the first electric push rod assembly is connected to the support plate, and the other end is connected to the gas collecting box assembly, one end of the second electric push rod assembly is connected to the support plate, and the other end is connected to the gas collecting box assembly, the gas collecting box assembly is located on the top of the gas collecting box support assembly and fixedly connected thereto.

[0010] Preferably, the air collecting box assembly includes an air collecting box body, a first end cover assembly, a second end cover assembly, a middle partition assembly, a pull-out sealing plate, a first piston rod assembly and a second piston rod assembly, one end of the air collecting box body is connected to the first end cover assembly, and the other end is connected to the second end cover assembly, the middle partition assembly is located at the inner center of the air collecting box body, the pull-out sealing plate passes through the top plate of the air collecting box body, the middle partition assembly and the pull-out sealing plate are detachably connected, and the pull-out sealing plate is placed in the guide groove of the middle partition assembly under the action of gravity, the first piston rod assembly, the first end cover assembly and the air collecting box body form an E chamber, the first piston rod assembly, the middle partition assembly and the air collecting box body form an F chamber, the second piston rod assembly, the middle partition assembly and the air collecting box body form a G chamber, and the second piston rod assembly, the second end cover assembly and the air collecting box body form an H chamber.

[0011] Preferably, air pipe mounting holes are provided on the front and back sides of the air collecting box body, and a handle is provided on the top of the pull-out sealing plate. The first piston rod assembly includes a piston rod, a piston, a gasket and a semicircular pressure plate. The piston rod passes through the first end cover assembly. A limiting groove is provided on the piston rod. The two semicircular pressure plates are engaged in the limiting groove. Bolts pass through the semicircular pressure plate, the gasket and the corresponding threaded mounting holes on the piston to achieve a firm connection of the first piston rod assembly.

[0012] Preferably, the air pipe pipeline includes a first air intake pipe assembly, a second air intake pipe assembly, a third air intake pipe assembly, a fourth air intake pipe assembly, a first exhaust pipe assembly, a second exhaust pipe assembly, a third exhaust pipe assembly and a fourth exhaust pipe assembly, the first air intake pipe assembly and the first exhaust pipe assembly are both connected to the E cavity of the air collecting box assembly, the second air intake pipe assembly and the second exhaust pipe assembly are both connected to the F cavity of the air collecting box assembly, the third air intake pipe assembly and the third exhaust pipe assembly are both connected to the G cavity of the air collecting box assembly, the fourth air intake pipe assembly and the fourth exhaust pipe assembly are both connected to the H cavity of the air collecting box assembly, and the first exhaust pipe assembly, the second exhaust pipe assembly, the third exhaust pipe assembly and the fourth exhaust pipe assembly all extend into the interior of the separation box body.

[0013] Preferably, a water replenishment check valve and a second booster water pump are provided on the water replenishment backwashing pipeline, the second booster water pump is located at the rear end of the water replenishment check valve, and the water replenishment backwashing pipeline is connected to the C area of ​​the separation box assembly.

[0014] The present invention also provides a treatment method for the sewage solid-liquid separation device, the treatment method comprising an oil separation method S1 and a backwashing method S2;

[0015] Wherein: the oil pollution cleaning method S1 comprises the following steps:

[0016] S11, sewage containing solid impurities and oil pollution first enters the primary sedimentation tank, and after adding neutralizing agent and standing for a period of time, large solid particles are deposited at the bottom of the primary sedimentation tank;

[0017] S12, open the first solenoid valve, start the first booster pump, pump the sewage in the primary sedimentation tank into the separation box, and when the liquid level in the separation box reaches the high level preset by the liquid level sensor, stop the operation of the first booster pump and close the first solenoid valve;

[0018] S13, after placing the pull-out sealing plate on the middle partition plate assembly, start the first electric push rod assembly and the second electric push rod assembly to make them move synchronously in the same direction. When the two move from the E chamber to the H chamber of the gas collecting box assembly, the gas in the F chamber and the H chamber is pressurized and aerated to the separation box body through the second exhaust pipe assembly and the fourth exhaust pipe assembly. When the first electric push rod assembly and the second electric push rod assembly are reversed, the gas in the E chamber and the G chamber is pressurized and aerated to the separation box body through the first exhaust pipe assembly and the third exhaust pipe assembly.

[0019] S14, during the continuous aeration process in the above step S13, the oil in the sewage in the separation box floats on the surface of the sewage, and at the same time, the solid particles in the sewage collide with the cutter of the filter plate assembly under the impact of the airflow, and the particle size of the solid particles is reduced. The direction changes during the collision, and the heavier solid particles are deposited at the bottom of the separation box;

[0020] S15, separate the pull-out sealing plate from the middle partition assembly, at this time, the F chamber and the G chamber of the air collecting box assembly are connected, start the second booster water pump, and inject water into the separation box body. At this time, the first electric push rod assembly and the second electric push rod assembly move synchronously in the same direction. When the water level of the separation box body reaches the height of the oil discharge pipe, the first exhaust pipe assembly and the fourth exhaust pipe assembly are alternately aerated, so that the oil in the sewage in the separation box body can be quickly discharged from the oil discharge pipes on both sides of the separation box body;

[0021] S16, after observing through the observation window that the oil in the sewage in the separation box is discharged, the second booster water pump is turned off and the water replenishment is stopped;

[0022] S17, reposition the pull-out sealing plate on the middle partition assembly, open the second solenoid valve, the sewage enters the second pipe, the solid impurities are retained in the second Y-type filter, and the liquid flows into the designated pipe. When the liquid level in the separation box reaches the preset low level of the liquid level sensor, close the second solenoid valve to stop draining;

[0023] S18, repeating steps S12 to S17;

[0024] When there is sludge on the bottom of the separation box and each filter plate assembly, backwashing method S2 is required, which includes the following steps:

[0025] S21, after the above step S17 is completed, while the second solenoid valve remains closed, the first solenoid valve is also closed;

[0026] S22, starting the second booster water pump to continuously inject high-pressure water into the separation box body;

[0027] S23, under the impact of airflow on the exhaust pipe assembly, the sludge and high-pressure water are fully mixed;

[0028] S24, after a certain period of time, open the drain valve at the bottom of the separation box body, and after the mixture of sludge and water is completely emptied, stop the operation of the second booster water pump and close the drain valve at the bottom of the separation box body.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) The present invention provides a sewage solid-liquid separation device, which includes a primary sedimentation tank, a first pipeline, a separation box assembly, a second pipeline, an air collection assembly, a water replenishment backwashing pipeline, an oil discharge pipeline and a PLC control system. The present invention uses a simple device structure, covers multiple processes such as primary sedimentation, neutralization, flotation separation, solid crushing, and backwashing, and can effectively remove solid impurities and oil stains in sewage, thereby realizing efficient separation and treatment of sewage.

[0031] (2) The present invention provides a sewage solid-liquid separation device. Through the structural setting of the air collecting box assembly and the change of the operation of the electric push rod, by plugging and pulling the sealing plate, aeration can be performed in different areas of the separation box body, so that the bubbles are distributed more evenly in the water body, the contact area between the entire water body and the bubbles is increased, and the contact rate between the bubbles and the suspended matter is promoted, so that the oil can float quickly on the surface of the sewage, thereby improving the efficiency of flotation; when cleaning the oil, aeration is alternately performed near the two side walls of the separation box body, and a circulation is formed under the impact of the air flow. The oil on both sides will be discharged through the oil discharge pipe. Driven by the circulation, the oil layer on the entire water surface moves to both sides, thereby accelerating the discharge speed of the oil; at the same time, the cutter on the filter plate assembly is used. When the solid impurities are continuously impacted by the air flow along with the liquid, the solid impurities are broken by the cutter, reducing the particle size of the solid, reducing the difficulty of subsequent sludge treatment, and through the setting of the filter plate assembly, the solid particles contact it, changing the direction of the speed, making the oil and solid easier to separate.

[0032] (3) The sewage solid-liquid separation device provided by the present invention has a water supply backwashing pipe. When oil floats on the sewage surface, water is supplied to the separation box through the water supply backwashing pipe, thereby promoting the stability of the liquid level rise. When the sludge in the separation box needs to be processed, rapid backwashing can be achieved, thus realizing a multifunctional structure.

[0033] (4) The sewage solid-liquid separation device provided by the present invention ensures the reliability of the operation of the device by setting up multiple one-way valves. The device is simple to operate, easy to repair and maintain, has a small overall footprint, and has no special requirements for the gas source. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2is a front view of a separation box assembly of the present invention;

[0036] Figure 3 The present invention Figure 1 II sectional view;

[0037] Figure 4 The present invention Figure 3 A partial enlarged view of

[0038] Figure 5 is a structural schematic diagram of a first piston rod assembly of the present invention;

[0039] Figure 6 It is a structural schematic diagram of the connection between the drawer sealing plate and the middle partition plate assembly of the present invention.

[0040] In the figure: 100, primary sedimentation tank; 200, first pipeline; 201, first solenoid valve; 202, first Y-type filter; 203, first booster pump; 204, liquid inlet stop valve; 300, separation box assembly; 310, separation box body; 311, separation box water inlet; 312, separation box water outlet; 313, separation box water replenishment port; 314, separation box oil discharge port; 320, liquid level sensor; 330, observation window; 340, first filter plate assembly; 350, second filter plate assembly; 360, third filter plate assembly; 400, second pipeline; 401, second solenoid valve; 402, second Y-type filter; 500, air collecting box support assembly; 510, base; 520, support plate; 610, first electric push rod assembly; 620, second electric push rod assembly; 700, air collecting box assembly; 7 10. Air collecting box body; 711. Air pipe mounting hole; 720. First end cover assembly; 730. Second end cover assembly; 740. Middle partition assembly; 741. Guide groove; 750. Pull-out sealing plate; 751. Handle; 760. First piston rod assembly; 761. Piston rod; 762. Limiting groove; 763. Piston; 764. Gasket; 765. Semicircular pressure plate; 770. Second piston rod assembly; 800. Air pipe; 810. First air inlet pipe assembly; 820. Second air inlet pipe assembly; 830. Third air inlet pipe assembly; 840. Fourth air inlet pipe assembly; 850. First exhaust pipe assembly; 860. Second exhaust pipe assembly; 870. Third exhaust pipe assembly; 880. Fourth exhaust pipe assembly; 900. Water replenishment backwashing pipeline; 901. Water replenishment one-way valve; 902. Second booster water pump. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be pointed out that the terms "upper", "lower", "left", "right", "top", "bottom", "inside", "outside" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0043] It should be understood that, in the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense.

[0044] Example 1

[0045] See attached Figures 1 to 6 This embodiment 1 provides a sewage solid-liquid separation device, which includes a primary sedimentation tank 100, a first pipeline 200, a separation box assembly 300, a second pipeline 400, an air collection assembly, a water replenishment backwash pipeline 900, an oil discharge pipeline and a PLC control system.

[0046] The sewage containing solid impurities and oil first enters the primary sedimentation tank 100. After a certain amount of neutralizer is added to the primary sedimentation tank 100 and left to stand for a period of time, its pH value is close to 7, and large particles of heavy solids are deposited at the bottom of the primary sedimentation tank 100.

[0047] One end of the first pipeline 200 is connected to the outlet end of the primary sedimentation tank 100, and the other end of the first pipeline 200 is connected to the separation box assembly 300; the first pipeline 200 includes a first solenoid valve 201, a first Y-type filter 202, a first booster water pump 203 and a liquid inlet stop valve 204 connected in sequence.

[0048] The separation box assembly 300 includes a separation box body 310, a liquid level sensor 320, an observation window 330, a first filter plate assembly 340, a second filter plate assembly 350 and a third filter plate assembly 360, the liquid level sensor 320 is located at the front of the separation box body 310 and is connected thereto, the observation window 330 is located at the front of the separation box body 310, the observation window 330 is fixedly connected to the separation box body 310 by bolts, the first filter plate assembly 340 is located inside the separation box body 310 and is fixedly connected thereto, the second filter plate assembly 350 is located at the top of the first filter plate assembly 340, the second filter plate assembly 350 is located inside the separation box body 310 and is fixedly connected thereto, the third filter plate assembly 360 is located at the top of the second filter plate assembly 350, and the third filter plate assembly 360 is located at the separation box The interior of the box body 310 is fixedly connected thereto, and filter holes and cutters (not shown) are provided on the first filter plate assembly 340, the second filter plate assembly 350 and the third filter plate assembly 360. The aperture a of the filter holes of the first filter plate assembly 340, the aperture b of the filter holes of the second filter plate assembly 350 and the aperture c of the filter holes of the third filter plate assembly 360 have the following relationship: a>b>c, the first filter plate assembly 340 and the bottom and side wall of the separation box body 310 form area A, the first filter plate assembly 340, the second filter plate assembly 350 and the separation box body 310 form area B, the second filter plate assembly 350, the third filter plate assembly 360 and the separation box body 310 form area C, and the third filter plate assembly 360 and the top side wall of the separation box body 310 form area D.

[0049] A support assembly (not shown) is usually provided on the outside of the side wall of the separation box body 310 to support the separation box assembly 300; a separation box water inlet 311 is provided on one side of the separation box body 310, and the water inlet 311 is connected to the first pipe 200; a separation box water outlet 312 and a separation box water replenishment port 313 are provided on the other side of the separation box body 310; the separation box water replenishment port 313 is located at the top of the separation box water outlet 312, the separation box water outlet 312 is connected to the second pipe, the separation box water replenishment port 313 is connected to the water replenishment backwash pipe 900, and separation box oil discharge ports 314 are provided on both sides of the separation box body, and the separation box oil discharge port 314 is connected to the oil discharge pipe.

[0050] When it is necessary to use the device of the present invention for sewage treatment, open the first solenoid valve 201 and start the first booster water pump 203, and the sewage in the primary sedimentation tank 100 is pumped into the separation box body 310. When the liquid level in the separation box body 310 reaches the high level set by the liquid level sensor 320, the liquid level sensor feeds back a signal to the PLC control system to stop the operation of the first booster water pump 203 and close the first solenoid valve 201.

[0051] The second pipeline 400 is connected to the separation box assembly 300 ; the second pipeline 400 includes a second solenoid valve 401 and a second Y-type filter 402 , the second Y-type filter 402 is located at the rear end of the second solenoid valve 401 , and the height of the second pipeline 400 is lower than the height of the first pipeline 200 .

[0052] The gas collecting assembly includes a gas collecting box support assembly 500, a first electric push rod assembly 610, a second electric push rod assembly 620, a gas collecting box assembly 700 and an air pipe 800. The gas collecting box support assembly 500 includes a base 510 and a support plate 520. The support plate 520 is a U-shaped plate. The support plate 520 is located on the top of the base 510 and is fixedly connected thereto. One end of the first electric push rod assembly 610 is connected to the support plate 520, and the other end is connected to the gas collecting box assembly 700. One end of the second electric push rod assembly 620 is connected to the support plate 520, and the other end is connected to the gas collecting box assembly 700. The gas collecting box assembly 700 is located on the top of the gas collecting box support assembly 500 and is fixedly connected thereto.

[0053] The gas collecting box assembly 700 includes a gas collecting box body 710, a first end cover assembly 720, a second end cover assembly 730, a middle partition assembly 740, a pull-out sealing plate 750, a first piston rod assembly 760 and a second piston rod assembly 770. One end of the gas collecting box body 710 is connected to the first end cover assembly 720, and the other end is connected to the second end cover assembly 730. The middle partition assembly 740 is located in the center of the gas collecting box body 710. The pull-out sealing plate 750 passes through the top plate of the gas collecting box body 710. The sealing plate 750 is placed in the guide groove 741 of the middle partition assembly 740 under the action of gravity, and the first piston rod assembly 760, the first end cover assembly 720 and the air collecting box body 710 form the E chamber, the first piston rod assembly 760, the middle partition assembly 740 and the air collecting box body 710 form the F chamber, the second piston rod assembly 770, the middle partition assembly 740 and the air collecting box body 710 form the G chamber, and the second piston rod assembly 770, the second end cover assembly 730 and the air collecting box body 710 form the H chamber.

[0054] The front and back sides of the gas collecting box body 710 are provided with air pipe installation holes 711, and the top of the pull-out sealing plate 750 is provided with a handle 751. The first piston rod assembly 760 includes a piston rod 761, a piston 763, a gasket 764 and a semicircular pressure plate 765. The piston rod 761 passes through the first end cover assembly 720. A limiting groove 762 is provided on the piston rod 761. Two semicircular pressure plates 765 are engaged in the limiting groove 762. In order to improve the crimping effect of the semicircular pressure plates, The number of mounting holes of the semicircular pressure plate 765 is preferably an odd number. Bolts pass through the corresponding threaded mounting holes on the semicircular pressure plate 765, the gasket 764 and the piston 763 to achieve a firm connection of the first piston rod assembly 760. The structure of the second piston rod assembly 770 is the same as that of the first piston rod assembly 760. The first piston rod 760 is fixedly connected to the extending shaft of the first electric push rod assembly 610, and the second piston rod 770 is fixedly connected to the extending shaft of the second electric push rod assembly 620.

[0055] The trachea pipeline 800 includes a first air intake pipe assembly 810, a second air intake pipe assembly 820, a third air intake pipe assembly 830, a fourth air intake pipe assembly 840, a first exhaust pipe assembly 850, a second exhaust pipe assembly 860, a third exhaust pipe assembly 870 and a fourth exhaust pipe assembly 880. A one-way valve is provided on each pipeline of the trachea pipeline 800. The first air intake pipe assembly 810 and the first exhaust pipe assembly 850 are both connected to the E cavity of the air collecting box assembly 700, the second air intake pipe assembly 820 and the second exhaust pipe assembly 860 are both connected to the F cavity of the air collecting box assembly 700, the third air intake pipe assembly 830 and the third exhaust pipe assembly 870 are both connected to the G cavity of the air collecting box assembly 700, and the fourth exhaust pipe assembly 880 is connected to the exhaust pipe assembly 850. The air intake pipe assembly 840 and the fourth exhaust pipe assembly 880 are both connected to the H cavity of the air collecting box assembly 700, the first exhaust pipe assembly 850, the second exhaust pipe assembly 860, the third exhaust pipe assembly 870 and the fourth exhaust pipe assembly 880 all extend into the interior of the separation box body 310, the first exhaust pipe assembly 850, the second exhaust pipe assembly 860, the third exhaust pipe assembly 870 and the fourth exhaust pipe assembly 880 are all provided with an aeration head (which can be fixed in advance inside the separation box body 310), the first exhaust pipe assembly 850 and the fourth exhaust pipe assembly 880 are close to the side wall of the separation box body 310, and the second exhaust pipe assembly 860 and the third exhaust pipe assembly 870 are close to the bottom center of the separation box body 310.

[0056] See attached Figure 1 It should be pointed out that the first electric push rod assembly 610 and the second electric push rod assembly 620 of the present invention move synchronously and in the same direction. In order to ensure the reliability and consistency of the movement, the initial state of the first electric assembly 610 and the second electric push rod assembly 620 is neither a fully extended state nor a fully retracted state. The initial state is that the distance extended by the extension shaft is equal to half of the working stroke.

[0057] See attached Figure 3 Since the medium in the one-way valve can only flow in one direction, the opening and closing of the one-way valve is related to the pressure difference at both ends. In the initial equilibrium state, when the pull-out sealing plate 750 is tightly connected to the middle partition plate assembly 740 under the action of gravity, the electric push rod assembly runs from the E chamber to the H chamber of the air collecting box assembly 700. The volume of the E chamber and the G chamber increases, and the internal air pressure is lower than one atmosphere. The one-way valves on the first air intake pipe 810 and the third air intake pipe 830 are opened, and the outside air enters the E chamber and the G chamber. At the same time, the volume of the F chamber and the H chamber decreases, and the air pressure rises. The second exhaust pipe assembly 860 and the fourth exhaust pipe assembly 860 are closed. The one-way valve on the exhaust pipe assembly 880 is opened, thereby completing the aeration process. When the electric push rod assembly is reversed, that is, when the electric push rod assembly runs from the H chamber of the air collecting box assembly 700 to the E chamber, when the pressure in the F chamber and the H chamber is lower than the opening pressure of the one-way valve of the exhaust pipe, the second exhaust pipe assembly 860 and the fourth exhaust pipe assembly 880 cannot be aerated. At this time, the volume of the E chamber and the G chamber becomes smaller, and aeration is carried out through the first exhaust pipe assembly 850 and the third exhaust pipe assembly 870. At the same time, the volume of the F chamber and the H chamber becomes larger, and the second air intake pipe 820 and the fourth air intake pipe 840 are opened, and the outside air enters the F chamber and the H chamber. When the pull-out sealing plate 750 is separated from the middle partition plate assembly 740, the F chamber and the G chamber are in a connected state. No matter how the electric push rod assembly runs, the total volume of the F chamber and the G chamber remains unchanged. That is, in this state, only one of the E chamber and the H chamber is aerated, and the other chamber is inhaled. Alternating aeration is achieved through the reversal of the electric push rod assembly.

[0058] A water replenishment check valve 901 and a second booster water pump 902 are provided on the water replenishment backwashing pipeline 900. The second booster water pump 902 is located at the rear end of the water replenishment check valve 901. The height of the water replenishment backwashing pipeline 900 is lower than the height of the oil discharge pipeline. The water replenishment backwashing pipeline 900 is connected to the C area of ​​the separation box assembly 300.

[0059] See attached Figure 1 It should be pointed out that the figure shows that the gas collecting assembly is located at the bottom of the separation box assembly 300, but in fact there is no such relationship between the two. It is only necessary to make the position of each exhaust pipe correspond to the position of the aeration head in the separation box body 310. In order to further prevent the mutual crosstalk between water and gas, two one-way valves are provided on the first exhaust pipe assembly 850, the second exhaust pipe assembly 860, the third exhaust pipe assembly 870 and the fourth exhaust pipe assembly 880, one of which is close to the gas collecting box assembly 700, and the other is close to the separation box assembly 300.

[0060] The present invention also provides a treatment method for a sewage solid-liquid separation device, the treatment method comprising an oil separation method S1 and a backwashing method S2;

[0061] Wherein: the oil pollution cleaning method S1 comprises the following steps:

[0062] S11, the sewage containing solid impurities and oil pollution first enters the primary sedimentation tank 100, a neutralizing agent is added therein and after being left to stand for a period of time, large solid particles are deposited at the bottom of the primary sedimentation tank 100;

[0063] S12, open the first solenoid valve 201, start the first booster pump 203, pump the sewage in the primary sedimentation tank 100 into the separation box body 310, when the liquid level in the separation box body 310 reaches the high level preset by the liquid level sensor 320, the liquid level sensor 320 feeds back a signal to the PLC control system, stops the operation of the first booster pump 203 and closes the first solenoid valve 201;

[0064] S13, after placing the drawer sealing plate 750 on the middle partition plate assembly 740, start the first electric push rod assembly 610 and the second electric push rod assembly 620 to make them move synchronously in the same direction. When the two move from the E chamber to the H chamber of the gas collecting box assembly 700, the gas in the F chamber and the H chamber is pressurized and aerated to the separation box body 310 through the second exhaust pipe assembly 860 and the fourth exhaust pipe assembly 880. When the first electric push rod assembly 610 and the second electric push rod assembly 620 are reversed, the gas in the E chamber and the G chamber is pressurized and aerated to the separation box body 310 through the first exhaust pipe assembly 850 and the third exhaust pipe assembly 870.

[0065] S14, during the continuous aeration process in step S13, the floating substances such as oil in the sewage in the separation box body 310 float on the surface of the sewage, and at the same time, the solid particles in the sewage collide with the cutter of the filter plate assembly under the impact of the airflow, and the particle size of the solid particles decreases. The direction changes during the collision, and the heavier solid particles are deposited at the bottom of the separation box body 310;

[0066] S15, separate the pull-out sealing plate 750 from the middle partition plate assembly 740, at which time the F cavity and the G cavity of the air collecting box assembly 700 are connected, start the second booster water pump 902, and inject water into the separation box body 310. At this time, the first electric push rod assembly 610 and the second electric push rod assembly 620 move synchronously in the same direction. When the water level of the separation box body 310 reaches the height of the oil discharge pipe, the first exhaust pipe assembly 850 and the fourth exhaust pipe assembly 880 are alternately aerated, so that the oil in the sewage in the separation box body 310 can be quickly discharged from the oil discharge pipes on both sides of the separation box body 310;

[0067] S16, after observing through the observation window 330 that the oil in the sewage in the separation box body 310 is discharged, the second booster water pump 902 is turned off to stop replenishing water;

[0068] S17, the pull-out sealing plate 750 is re-placed on the middle partition plate assembly 740, the second solenoid valve 401 is opened, the sewage enters the second pipe 400, the solid impurities are retained in the second Y-type filter 402, and the liquid flows into the designated pipe. When the liquid level in the separation box body 310 reaches the preset low level of the liquid level sensor 320, the liquid level sensor 320 feeds back a signal to the PLC control system, closes the second solenoid valve 401, and stops draining;

[0069] S18, repeating steps S12 to S17;

[0070] When there is sludge at the bottom of the separation box body 310 and each filter plate assembly, a backwashing method S2 is required, which includes the following steps:

[0071] S21, after the above step S17 is completed, while the second solenoid valve 401 remains closed, the first solenoid valve 201 is also closed;

[0072] S22, start the second booster water pump 902 to continuously inject high-pressure water into the separation box body 310;

[0073] S23, under the impact of airflow on the exhaust pipe assembly, the sludge and high-pressure water are fully mixed;

[0074] S24, after a certain period of time, open the drain valve at the bottom of the separation box body 310, and after the mixture of sludge and water is completely emptied, stop the operation of the second booster water pump 902, and close the drain valve at the bottom of the separation box body 310.

[0075] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sewage solid-liquid separation device, characterized in that: It comprises a primary sedimentation tank (100), a first pipeline (200), a separation box assembly (300), a second pipeline (400), a gas collection assembly, a water replenishment backwashing pipeline (900), an oil discharge pipeline and a PLC control system; One end of the first pipeline (200) is connected to the outlet end of the primary sedimentation tank (100), and the other end of the first pipeline (200) is connected to the separation box assembly (300); The second pipeline (400) is connected to the separation box assembly (300); The water replenishment backwashing pipeline (900) is connected to the separation box assembly (300), and the oil discharge pipeline is connected to the separation box assembly (300); The sewage containing solid impurities and oil pollution first enters the interior of the primary sedimentation tank (100), and after preliminary neutralization and sedimentation, is pumped into the interior of the separation box assembly (300) through the first pipeline (200). The air collecting assembly inputs pressurized air into the interior of the separation box assembly (300). Under the continuous impact of the air flow, the oil pollution in the separation box assembly (300) will float on the sewage surface, and the solid particles in the separation box assembly (300) will become smaller. The liquid level of the separation box assembly (300) is raised through the water replenishment backwashing pipeline (900), and the oil pollution in the separation box assembly (300) is discharged through the oil discharge pipeline; The gas collecting assembly comprises a gas collecting box support assembly (500), a first electric push rod assembly (610), a second electric push rod assembly (620), a gas collecting box assembly (700) and an air pipe (800); the gas collecting box support assembly (500) comprises a base (510) and a support plate (520); the support plate (520) is a U-shaped plate; the support plate (520) is located on the top of the base (510) and is fixedly connected thereto; one end of the first electric push rod assembly (610) is connected to the support plate (520) and the other end is connected to the gas collecting box assembly (700); one end of the second electric push rod assembly (620) is connected to the support plate (520) and the other end is connected to the gas collecting box assembly (700); the gas collecting box assembly (700) is located on the top of the gas collecting box support assembly (500) and is fixedly connected thereto; The air collecting box assembly (700) comprises an air collecting box body (710), a first end cover assembly (720), a second end cover assembly (730), a middle partition assembly (740), a pull-out sealing plate (750), a first piston rod assembly (760) and a second piston rod assembly (770); one end of the air collecting box body (710) is connected to the first end cover assembly (720), and the other end is connected to the second end cover assembly (730); the middle partition assembly (740) is located at the inner center of the air collecting box body (710); the pull-out sealing plate (750) passes through the top plate of the air collecting box body (710); the pull-out sealing plate (750) and the middle partition assembly (740) are connected to each other. ) are detachably connected, the pull-out sealing plate (750) is placed in the guide groove (741) of the middle partition plate assembly (740) under the action of gravity, the first piston rod assembly (760), the first end cover assembly (720) and the gas collecting box body (710) form an E chamber, the first piston rod assembly (760), the middle partition plate assembly (740) and the gas collecting box body (710) form an F chamber, the second piston rod assembly (770), the middle partition plate assembly (740) and the gas collecting box body (710) form a G chamber, and the second piston rod assembly (770), the second end cover assembly (730) and the gas collecting box body (710) form an H chamber; The trachea pipeline (800) comprises a first intake pipe assembly (810), a second intake pipe assembly (820), a third intake pipe assembly (830), a fourth intake pipe assembly (840), a first exhaust pipe assembly (850), a second exhaust pipe assembly (860), a third exhaust pipe assembly (870) and a fourth exhaust pipe assembly (880); the first intake pipe assembly (810) and the first exhaust pipe assembly (850) are both connected to the E chamber of the air collecting box assembly (700); the second intake pipe assembly (820) and the second exhaust pipe assembly (860) are both connected to the E chamber of the air collecting box assembly (700); The third air intake pipe assembly (830) and the third exhaust pipe assembly (870) are both connected to the G chamber of the air collecting box assembly (700), the fourth air intake pipe assembly (840) and the fourth exhaust pipe assembly (880) are both connected to the H chamber of the air collecting box assembly (700), and the first exhaust pipe assembly (850), the second exhaust pipe assembly (860), the third exhaust pipe assembly (870) and the fourth exhaust pipe assembly (880) all extend into the interior of the separation box assembly (300).

2. The sewage solid-liquid separation device according to claim 1, characterized in that: The first pipeline (200) comprises a first solenoid valve (201), a first Y-type filter (202), a first booster water pump (203) and a liquid inlet stop valve (204) which are connected in sequence, and the second pipeline (400) comprises a second solenoid valve (401) and a second Y-type filter (402), wherein the second Y-type filter (402) is located at the rear end of the second solenoid valve (401).

3. The sewage solid-liquid separation device according to claim 2, characterized in that: The separation box assembly (300) comprises a separation box body (310), a liquid level sensor (320), an observation window (330), a first filter plate assembly (340), a second filter plate assembly (350) and a third filter plate assembly (360), wherein the liquid level sensor (320) is located on the front side of the separation box body (310) and is in communication with the separation box body, the observation window (330) is located on the front side of the separation box body (310), the first filter plate assembly (340), the second filter plate assembly (350) and the third filter plate assembly (360) are all located inside the separation box body (310), and the first filter plate assembly The first filter plate assembly (340), the second filter plate assembly (350) and the third filter plate assembly (360) are all provided with filter holes and cutters; the first filter plate assembly (340) and the bottom and side walls of the separation box body (310) form area A; the first filter plate assembly (340), the second filter plate assembly (350) and the separation box body (310) form area B; the second filter plate assembly (350), the third filter plate assembly (360) and the separation box body (310) form area C; the third filter plate assembly (360) and the top side wall of the separation box body (310) form area D.

4. The sewage solid-liquid separation device according to claim 3, characterized in that: A separation box water inlet (311) is provided on one side of the separation box body (310), and a separation box water outlet (312) and a separation box water replenishment port (313) are provided on the other side of the separation box body (310), wherein the separation box water replenishment port (313) is located at the top of the separation box water outlet (312), and separation box oil discharge ports (314) are provided on both sides of the separation box body.

5. The sewage solid-liquid separation device according to claim 4, characterized in that: The front and back sides of the air collecting box body (710) are provided with air pipe mounting holes (711), and the top of the pull-out sealing plate (750) is provided with a handle (751). The first piston rod assembly (760) includes a piston rod (761), a piston (763), a gasket (764) and a semicircular pressure plate (765). The piston rod (761) passes through the first end cover assembly (720), and a limiting groove (762) is provided on the piston rod (761). The two semicircular pressure plates (765) are engaged in the limiting groove (762), and bolts pass through the semicircular pressure plate (765), the gasket (764) and the corresponding threaded mounting holes on the piston (763) to realize a firm connection of the first piston rod assembly (760).

6. The sewage solid-liquid separation device according to claim 5, characterized in that: The water replenishment backwashing pipeline (900) is provided with a water replenishment check valve (901) and a second booster water pump (902), wherein the second booster water pump (902) is located at the rear end of the water replenishment check valve (901), and the water replenishment backwashing pipeline (900) is connected to the C region of the separation box assembly (300).

7. The method for treating sewage solid-liquid separation device according to claim 6, characterized in that: The treatment method includes an oil separation method S1 and a backwashing method S2; Wherein: the oil pollution cleaning method S1 comprises the following steps: S11, the sewage containing solid impurities and oil pollution first enters the primary sedimentation tank (100), a neutralizing agent is added therein and after being left to stand for a period of time, large solid particles are deposited at the bottom of the primary sedimentation tank (100); S12, opening the first solenoid valve (201), starting the first booster pump (203), pumping the sewage in the primary sedimentation tank (100) into the separation box body (310), and when the liquid level in the separation box body (310) reaches the high level preset by the liquid level sensor (320), stopping the operation of the first booster pump (203) and closing the first solenoid valve (201); S13, after placing the pull-out sealing plate (750) on the middle partition plate assembly (740), start the first electric push rod assembly (610) and the second electric push rod assembly (620) to make the two move synchronously in the same direction. When the two move from the E chamber to the H chamber of the air collecting box assembly (700), the gas in the F chamber and the H chamber is pressurized and aerated toward the separation box body (310) through the second exhaust pipe assembly (860) and the fourth exhaust pipe assembly (880). When the first electric push rod assembly (610) and the second electric push rod assembly (620) are reversed, the gas in the E chamber and the G chamber is pressurized and aerated toward the separation box body (310) through the first exhaust pipe assembly (850) and the third exhaust pipe assembly (870); S14, during the continuous aeration process in step S13, the oil in the sewage in the separation box body (310) floats on the surface of the sewage, and at the same time, the solid particles in the sewage collide with the cutter of the filter plate assembly under the impact of the airflow, and the particle size of the solid particles decreases. The direction of the solid particles changes during the collision, and the heavier solid particles are deposited at the bottom of the separation box body (310); S15, the pull-out sealing plate (750) is separated from the middle partition plate assembly (740), at which time the F cavity and the G cavity of the air collecting box assembly (700) are connected, and the second booster water pump (902) is started to inject water into the separation box body (310). At this time, the first electric push rod assembly (610) and the second electric push rod assembly (620) move synchronously in the same direction. When the water level of the separation box body (310) reaches the height of the oil discharge pipe, the first exhaust pipe assembly (850) and the fourth exhaust pipe assembly (880) are alternately aerated, so that the oil in the sewage in the separation box body (310) can be quickly discharged from the oil discharge pipes on both sides of the separation box body (310); S16, after observing through the observation window (330) that the oil in the sewage in the separation box body (310) has been discharged, the second booster water pump (902) is turned off and the water replenishment is stopped; S17, the pull-out sealing plate (750) is re-placed on the middle partition plate assembly (740), the second solenoid valve (401) is opened, the sewage enters the second pipe (400), the solid impurities are retained in the second Y-type filter (402), and the liquid flows into the designated pipe. When the liquid level in the separation box body (310) reaches the preset low level of the liquid level sensor (320), the second solenoid valve (401) is closed to stop drainage; S18, repeating steps S12 to S17; When there is sludge on the bottom of the separation box body (310) and each filter plate assembly, a backwashing method S2 is required, which includes the following steps: S21, after the above step S17 is completed, while the second solenoid valve (401) remains in a closed state, the first solenoid valve (201) is also in a closed state; S22, starting the second booster water pump (902) to continuously inject high-pressure water into the separation box body (310); S23, under the impact of airflow on the exhaust pipe assembly, the sludge and high-pressure water are fully mixed; S24, after a certain period of time, open the drain valve at the bottom of the separation box body (310), and after the mixture of sludge and water is completely drained, stop the operation of the second booster water pump (902), and close the drain valve at the bottom of the separation box body (310).

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