A sewage treatment system

Abstract

The present invention provides a sewage treatment system, including a UASB reactor, a primary sedimentation tank, an aerobic tank, a secondary sedimentation tank, a sludge thickening tank and a sludge treatment device. A three-phase separator is provided to remove the bubbles in the sewage in a suspended state and transport the muddy-water mixture after the primary treatment to the primary sedimentation tank for sedimentation and stratification treatment, and then the upper sewage is connected to the aerobic tank, so that the activated sludge can undergo aerobic respiration in the aerobic tank, further decompose the organic matter into inorganic matter, and then the sewage in the aerobic tank is conducted to the secondary sedimentation tank for precipitation, so as to make full use of the biological colonies in the sewage to remove the organic pollutants in the sludge; in addition, the sludge in the sludge thickening tank is recycled and utilized by the sludge treatment equipment, so as to improve the sewage treatment efficiency. The existing sewage treatment system does not pay attention to the filtration and utilization of the sludge in the sewage, and the sludge is easily accumulated, resulting in low sewage treatment efficiency.

Description

Technical Field

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

[0002] Wastewater treatment is the process of purifying wastewater to meet the water quality requirements for discharge into a water body or reuse. Wastewater treatment is widely used in various fields such as construction, agriculture, transportation, energy, petrochemicals, environmental protection, urban landscape, medical care, and catering, and is increasingly entering the daily lives of ordinary people.

[0003] However, the existing sewage treatment system does not pay attention to the filtration and utilization of sludge in sewage, but simply carries out chemical treatment. After the sewage reaches the discharge standard, the treated water is discharged. Over time, the sludge is easy to accumulate, causing blockage in the sewage treatment system, thereby resulting in low sewage treatment efficiency. Summary of the invention

[0004] Based on this, in order to solve the problem that the existing sewage treatment system does not pay attention to the filtration and utilization of sludge in sewage, sludge is easily accumulated and thus causes low sewage treatment efficiency, the present invention provides a sewage treatment system, and its specific technical solution is as follows:

[0005] A sewage treatment system comprises a UASB reactor, a primary sedimentation tank, an aerobic tank, a secondary sedimentation tank, a sludge thickening tank and a sludge treatment device; the UASB reactor is provided with a three-phase separator, the three-phase separator is provided with a first water inlet and a first water outlet, the primary sedimentation tank is provided with a second water inlet and a second water outlet, and a first mud outlet, the aerobic tank is provided with a third water inlet and a third water outlet, the secondary sedimentation tank is provided with a fourth water inlet and a fourth water outlet, and a second mud outlet; the sludge thickening tank is provided with a first mud inlet and a second mud inlet, and a mud outlet; the first water inlet is connected to a sewage pipe, the first water outlet is connected to the second water inlet, the second water outlet is connected to the third water inlet, the first mud outlet is connected to the first mud inlet, the third water outlet is connected to the fourth water inlet, the fourth water outlet is connected to a drainage pipe, the second mud outlet is connected to the second mud inlet, and the mud outlet is connected to the sludge treatment device.

[0006] The above-mentioned sewage treatment system is provided with a three-phase separator to remove the bubbles in suspension in the sewage and transport the mud-water mixture after the initial treatment to the primary sedimentation tank for sedimentation and stratification treatment, and then the upper sewage is connected to the aerobic tank, so that the activated sludge can undergo aerobic respiration in the aerobic tank, further decomposing the organic matter into inorganic matter, and then the sewage in the aerobic tank is conducted to the secondary sedimentation tank for sedimentation, thereby making full use of the biological colonies in the sewage to remove the organic pollutants in the sludge; in addition, the sludge in the sludge concentration tank is recycled by the sludge treatment equipment, thereby improving the sewage treatment efficiency.

[0007] Furthermore, an anaerobic reaction tank is provided at the bottom of the UASB reactor, and the three-phase separator is arranged above the anaerobic reaction tank. The three-phase separator includes a box without a bottom surface; a plurality of rows of gas collecting hoods with an inverted V-shaped cross-section are provided in the middle of the box, and an exhaust pipe is provided at the top of the box.

[0008] Furthermore, the sewage treatment system also includes a flue gas treatment device, and an air outlet is provided at the top of the three-phase separator; the flue gas treatment equipment includes an air intake pipe, a filter barrel, an exhaust fan and an air outlet pipe connected in sequence; the air intake pipe is connected to the exhaust pipe.

[0009] Furthermore, a submersible agitator is provided in the primary sedimentation tank, and the first mud outlet is arranged at the bottom of the primary sedimentation tank; the submersible agitator is provided with a stirring paddle, and the stirring paddle is used to stir the sludge at the bottom of the primary sedimentation tank.

[0010] Furthermore, the first mud outlet is provided with a pump assembly, and the pump assembly is used to pump the sludge from the first mud outlet to the first mud inlet.

[0011] Furthermore, the aerobic pool is provided with an aeration device, which includes a fan assembly and a filler assembly, and the fan assembly performs blower aeration through a fan; the filler assembly includes a plurality of double rings, and the double rings include an outer ring and an inner ring, the outer ring is a ring fixed with aldehyded fiber or polyester filament, and the inner ring is a snowflake-shaped plastic branch.

[0012] Furthermore, the second sedimentation tank is a circular tank body, a water outlet is provided at the outer circle of the circular tank body, a sludge hole is provided at the bottom center of the circular tank body, and the second sludge outlet is connected to the sludge hole.

[0013] Furthermore, the bottom of the secondary sedimentation tank is a cone, and the sludge hole is arranged at the bottom of the cone.

[0014] Furthermore, a scraper device is provided at the bottom center of the secondary sedimentation tank, and the scraper device includes a driving device, an upper walking assembly and a lower scraper blade assembly. The driving device is arranged at the center of the secondary sedimentation tank, the upper walking assembly includes a horizontal ladder, and the lower scraper blade assembly includes a rotating frame, and at least two groups of symmetrically arranged scraper blade groups are provided on the rotating frame.

[0015] Furthermore, the sludge treatment equipment includes a chamber filter press, which includes a bracket, the bracket includes two parallel beams, a number of filter plates are slidably connected to the two beams, a clamping plate and a thrust plate are respectively provided at both ends of the bracket, and an oil cylinder for driving the clamping plate is provided at one end of the bracket located at the clamping plate, grooves are provided on both side surfaces of the filter plates, push plates are provided in the grooves, and a driving component for driving the two push plates to move toward both sides is provided in the filter plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention can be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily drawn to scale, but the emphasis is placed on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0017] Figure 1 The structure of the sewage treatment system according to one embodiment of the present invention is shown in FIG. Figure 1 ;

[0018] Figure 2 The structure of the sewage treatment system according to one embodiment of the present invention is shown in FIG. Figure 2 ;

[0019] Figure 3 is a structural schematic diagram of a flue gas treatment device according to an embodiment of the present invention;

[0020] Figure 4 is a schematic structural diagram of a three-phase separator according to an embodiment of the present invention;

[0021] Figure 5 It is a structural schematic diagram of a secondary sedimentation tank in a sewage treatment system according to an embodiment of the present invention;

[0022] Figure 6 It is a structural schematic diagram of a sludge scraping device of a sewage treatment system according to an embodiment of the present invention;

[0023] Figure 7 It is a structural schematic diagram of a sludge treatment device according to an embodiment of the present invention;

[0024] Figure 8 The structure of the secondary sedimentation tank in the sewage treatment system according to one embodiment of the present invention is a cross-sectional view Figure 1 ;

[0025] Fig. 9 The structural cross-section of the secondary sedimentation tank in the sewage treatment system according to one embodiment of the present invention Figure 2 .

[0026] Description of reference numerals:

[0027] 1-UASB reactor, 2-primary sedimentation tank, 3-aerobic tank, 4-secondary sedimentation tank, 5-sludge thickening tank;

[0028] 6-sludge treatment equipment, 7-flue gas treatment equipment;

[0029] 11- three-phase separator;

[0030] 111-first water inlet, 112-first water outlet, 113-box, 114-air collecting hood, 115-exhaust pipe;

[0031] 21-second water inlet, 22-second water outlet, 23-first mud outlet;

[0032] 201-Submersible mixer;

[0033] 31-third water inlet, 32-third water outlet, 33-aeration equipment;

[0034] 331- fan assembly, 332- packing assembly;

[0035] 41- fourth water inlet, 42- fourth water outlet, 43- second mud outlet, 44- mud scraping equipment;

[0036] 441-driving device, 442-upper walking assembly, 443-lower scraper assembly;

[0037] 401-outlet channel, 402-sinkhole;

[0038] 51-first mud inlet, 52-second mud inlet, 53-mud discharge outlet;

[0039] 61- chamber filter press, 611- mud inlet, 612- drain outlet;

[0040] 71 - air inlet duct, 72 - filter barrel, 73 - exhaust fan, 74 - air outlet duct. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with its embodiments. It should be understood that the specific implementation methods described herein are only used to explain the present invention and do not limit the protection scope of the present invention.

[0042] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0044] The “first” and “second” mentioned in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.

[0045] like Figure 1 and Figure 2 As shown, a sewage treatment system in one embodiment of the present invention comprises a UASB reactor 1, a primary sedimentation tank 2, an aerobic tank 3, a secondary sedimentation tank 4, a sludge thickening tank 5 and a sludge treatment device 6; the UASB reactor 1 is provided with a three-phase separator 11, the three-phase separator 11 is provided with a first water inlet 111 and a first water outlet 112, the primary sedimentation tank 2 is provided with a second water inlet 21 and a second water outlet 22, and a first mud outlet 23, the aerobic tank 3 is provided with a third water inlet 31 and a third water outlet 32, the secondary sedimentation tank 4 is provided with a fourth water inlet 41 and a fourth water outlet 42, and a second mud outlet 43; The sludge thickening tank 5 is provided with a first mud inlet 51, a second mud inlet 52, and a mud discharge port 53; the first water inlet 111 is connected to a sewage pipe, the first water outlet 112 is connected to the second water inlet 21, the second water outlet 22 is connected to the third water inlet 32, the first mud outlet 23 is connected to the first mud inlet 51, the third water outlet 31 is connected to the fourth water inlet 41, the fourth water outlet 42 is connected to a drainage pipe, the second mud outlet 43 is connected to the second mud inlet 52, and the mud discharge port 53 is connected to the sludge treatment equipment 6.

[0046] The above-mentioned sewage treatment system is provided with a three-phase separator 11 to remove the bubbles in suspension in the sewage and transport the mud-water mixture after the initial treatment to the primary sedimentation tank 2 for sedimentation and stratification treatment, and then the upper sewage is connected to the aerobic tank 3, so that the activated sludge can undergo aerobic respiration in the aerobic tank 3, further decomposing the organic matter into inorganic matter, and then the sewage in the aerobic tank 3 is conducted to the secondary sedimentation tank 4 for sedimentation, thereby making full use of the biological colonies in the sewage to remove the organic pollutants in the sludge; in addition, the sludge in the sludge concentration tank 5 is recycled by the sludge treatment equipment 6, thereby improving the sewage treatment efficiency.

[0047] Specifically, the raw sewage from the sewage collection tank passes through the screen of the coarse screen or the screener through the sewage lifting pump, and then enters the UASB reactor 1. Then, the sewage enters the primary sedimentation tank 2 for primary sedimentation, and part of the sludge enters the sludge thickening tank 5 for sludge treatment. The effluent from the primary sedimentation tank 2 enters the aerobic tank 3 and the secondary sedimentation tank 4 in turn. The sewage undergoes organic oxidation in the aerobic tank 3 to remove organic pollutants in the sewage. The effluent from the aerobic tank 3 enters the secondary sedimentation tank, and the effluent from the secondary sedimentation tank 4 is discharged or subjected to subsequent treatment. Most of the sludge in the secondary sedimentation tank 4 enters the sludge thickening tank 5, and part of it flows back to the primary sedimentation tank 2 or the aerobic tank 3. The sludge in the sludge thickening tank 5 passes through the dehydration and drying equipment, and the sludge is finally utilized.

[0048] like Figure 4 As shown, in one embodiment, an anaerobic reaction tank is provided at the bottom of the UASB reactor 1, and the three-phase separator 11 is arranged above the anaerobic reaction tank. The three-phase separator 11 includes a box 113 without a bottom surface; a plurality of rows of gas collecting hoods 114 with an inverted V-shaped cross section and a plurality of vertical partitions are provided in the middle of the box 113, and an exhaust pipe 115 is provided at the top of the box 113. In this way, the anaerobic reaction tank can hydrolyze, acidify and methanize the organic matter in the sewage, remove the organic matter in the wastewater, and improve the biodegradability of the sewage; in addition, after the sewage enters the three-phase separator 11, it is bent to both sides under the blocking effect of the gas collecting hood 114, and the bubbles rise rapidly, enter the gas collecting hood 114 and are discharged from the exhaust pipe 115, wherein, due to the elimination of the lifting effect of the bubbles, the speed of the liquid flow gradually decreases during the rising process, so that the sludge settles and enters the first water outlet 112, thereby realizing the water-gas separation of the sewage, and then improving the sewage treatment efficiency.

[0049] In one embodiment, the UASB reactor 1 is provided with an air pump assembly, which is used to pump gas into the box 113 of the three-phase separator 11. The box 113 is provided with an air inlet directly below the gas collecting cover 114, and the air inlet is connected to the air pump assembly. In this way, the air is pumped into the three-phase separator 11 by the air pump assembly, which facilitates the rapid separation of gas in the sewage, thereby improving the sewage treatment efficiency.

[0050] like Figure 3As shown, in one embodiment, the sewage treatment system also includes a flue gas treatment device 7, and an exhaust pipe 115 is provided on the top of the three-phase separator 11; the flue gas treatment device 7 includes an air intake pipe 71, a filter barrel 72, an exhaust fan 73 and an air outlet pipe 74 connected in sequence; the air intake pipe 71 is connected to the exhaust pipe 115. Specifically, the filter barrel 72 is provided with an absorption liquid, and the absorption liquid is used for the gas separated from the sewage. In this way, the gas separated from the sewage is blown into the filter barrel 72 through the exhaust fan 73, so that the absorption liquid absorbs harmful gases such as hydrogen sulfide, hydrogen cyanide, carbon monoxide, etc., to avoid environmental pollution caused by harmful gases.

[0051] In one embodiment, a submersible agitator 201 is provided in the primary sedimentation tank 2, and a first mud outlet 23 is provided at the bottom of the primary sedimentation tank 2; the submersible agitator 201 is provided with a stirring paddle, and the stirring paddle is used to stir the sludge at the bottom of the primary sedimentation tank 2. In this way, the sludge at the bottom of the primary sedimentation tank 2 is stirred by the stirring paddle, so as to avoid the sludge being squeezed and blocked and unable to be discharged from the first mud outlet 23, thereby ensuring the smooth discharge of the sludge and improving the sewage treatment efficiency.

[0052] In one embodiment, the primary sedimentation tank 2 is rectangular, the bottom of the primary sedimentation tank 2 is in the shape of a quadrangular pyramid, and the first mud outlet 23 is arranged at the top of the pyramid. In this way, it is convenient for the sludge to be deposited at the bottom of the primary sedimentation tank 2 and then be extracted to the sludge concentration tank 5, so as to perform sludge treatment and improve the sewage treatment efficiency.

[0053] In one embodiment, the first mud outlet 23 is provided with a pump assembly, and the pump assembly is used to pump the sludge from the first mud outlet 23 to the first mud inlet 51. In this way, the sludge from the first mud outlet 23 is pumped out by the pump assembly, so as to avoid sludge accumulation and pipeline blockage, thereby improving sewage treatment efficiency.

[0054] like Figure 1 As shown, in one embodiment, the aerobic pool 3 is provided with an aeration device 33, the aeration device 33 includes a fan assembly 331 and a filler assembly 332, the fan assembly 331 is aerated by a fan; the filler assembly 332 includes a plurality of double rings, the double rings include an outer ring and an inner ring, the outer ring is a ring with aldehyded fiber or polyester yarn fixed, and the inner ring is a snowflake-shaped plastic branch. In this way, the double ring structure can both hang the film and effectively cut the bubbles, thereby improving the transfer rate and utilization rate of oxygen, and then the water and gas biofilm is fully exchanged, and the organic matter in the water is efficiently treated, thereby improving the sewage treatment efficiency.

[0055] like Figure 4 and Figure 8 , Fig. 9As shown, in one embodiment, the second sedimentation tank 4 is a circular tank body, a water outlet channel 401 is provided at the outer circle of the circular tank body, a sludge hole 402 is provided at the bottom center of the circular tank body, and the second sludge outlet 43 is connected to the sludge hole 402. In this way, it is convenient for sludge to be deposited in the sludge hole 402 and then extracted to the sludge concentration tank 5 for sludge treatment, thereby improving the sewage treatment efficiency.

[0056] In one embodiment, the bottom of the secondary sedimentation tank 4 is a cone, and the sludge hole 402 is arranged at the bottom of the cone, so that the sludge is easily deposited to the second sludge outlet 43 of the sludge hole 402 at the bottom of the secondary sedimentation tank 4, so that the sludge accumulates and causes pipe blockage, thereby reducing the sewage treatment efficiency.

[0057] like Figure 6 As shown, in one embodiment, a scraper device 44 is provided at the bottom center of the secondary sedimentation tank 4, and the scraper device 44 includes a driving device 441, an upper walking assembly 442 and a lower scraper blade assembly 443. The driving device 441 is arranged at the center of the secondary sedimentation tank 4, the upper walking assembly 442 includes a horizontal ladder, and the horizontal ladder is used for operator maintenance and feeding. The lower scraper blade assembly 443 includes a rotating frame, and at least two groups of symmetrically arranged scraper blade groups are provided on the rotating frame.

[0058] In one embodiment, the scraper group is provided with a plurality of arc-shaped scraper blades, which are inclined at a certain angle toward the center of the secondary sedimentation tank 4. In this way, the scraper blades can collect the sludge into the sedimentation hole 402 for processing, thereby avoiding sludge accumulation at the bottom of the secondary sedimentation tank 4.

[0059] like Figure 7 As shown, in one embodiment, the sludge treatment equipment 6 includes a chamber filter press 61, and the chamber filter press 61 is provided with a mud inlet 611 and a drain outlet 612; the chamber filter press 61 includes a bracket, and the bracket includes two parallel beams, and a plurality of filter plates are slidably connected to the two beams, and a clamping plate and a thrust plate are respectively provided at both ends of the bracket, and an oil cylinder for driving the clamping plate is provided at one end of the bracket located at the clamping plate, grooves are provided on both side surfaces of the filter plate, and push plates are provided in the grooves, and a driving component for driving the two push plates to move toward both sides is provided in the filter plate; the mud inlet 611 is used to pump the sludge from the sludge thickening tank 5 into the chamber filter press 61, and the drain outlet 612 is used to discharge the water squeezed by the chamber filter press 61.

[0060] In one embodiment, the filter plate is provided with a connection groove running through one side thereof, a slide groove connected to the connection groove is provided at the bottom of the connection groove, the connection groove is connected to the groove, the drive assembly includes two sliding rods slidably connected to the slide groove, the two sliding rods are respectively fixedly connected to two push plates, a plurality of springs are arranged between the push plates and the bottom of the groove, and a driving member for controlling the movement of the two sliding rods is arranged in the connection groove. In this way, by inserting the driving rod into the connection groove, the two push plates are pushed toward the two sides of the filter plate through the top, thereby separating the filter plate from the filter cake adhered to the filter plate, facilitating unloading, and thus improving the sludge treatment efficiency.

[0061] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A sewage treatment system, characterized in that: It includes UASB reactor, primary sedimentation tank, aerobic tank, secondary sedimentation tank, sludge thickening tank and sludge treatment equipment; The UASB reactor is provided with a three-phase separator, the three-phase separator is provided with a first water inlet and a first water outlet, and the primary sedimentation tank is provided with a second water inlet and a second water outlet, and a first mud outlet; The aerobic pool is provided with a third water inlet and a third water outlet; The secondary sedimentation tank is provided with a fourth water inlet, a fourth water outlet, and a second mud outlet; The sludge thickening tank is provided with a first sludge inlet, a second sludge inlet, and a sludge discharge port; The first water inlet is connected to a sewage pipe, the first water outlet is connected to the second water inlet, the second water outlet is connected to the third water inlet, the first mud outlet is connected to the first mud inlet, the third water outlet is connected to the fourth water inlet, the fourth water outlet is connected to a drainage pipe, the second mud outlet is connected to the second mud inlet, and the mud outlet is connected to a sludge treatment device; A submersible agitator is provided in the primary sedimentation tank, and a first mud outlet is provided at the bottom of the primary sedimentation tank; The submersible agitator is provided with a stirring paddle, and the stirring paddle is used to stir the sludge at the bottom of the primary sedimentation tank; The second sedimentation tank is a circular tank body, a water outlet is provided at the outer circle of the circular tank body, a mud hole is provided at the bottom center of the circular tank body, and the second mud outlet is connected to the mud hole; The bottom of the secondary sedimentation tank is a cone, and the sludge hole is arranged at the bottom of the cone; A scraper device is provided at the bottom center of the secondary sedimentation tank, and the scraper device includes a driving device, an upper walking assembly and a lower scraper assembly. The driving device is arranged at the center of the secondary sedimentation tank, the upper walking assembly includes a horizontal ladder, and the lower scraper assembly includes a rotating frame, and at least two groups of symmetrically arranged scraper groups are provided on the rotating frame; The scraper group is provided with a plurality of arc-shaped scraper blades, and the scraper blades are inclined toward the center of the secondary sedimentation tank at a certain angle.

2. A sewage treatment system according to claim 1, characterized in that: An anaerobic reaction tank is provided at the bottom of the UASB reactor, and the three-phase separator is arranged above the anaerobic reaction tank, and the three-phase separator includes a box without a bottom surface; A plurality of rows of air collecting hoods with inverted V-shaped cross sections are arranged in the middle of the box body, and an exhaust pipe is arranged at the top of the box body.

3. A sewage treatment system according to claim 2, characterized in that: The sewage treatment system also includes a flue gas treatment device, and an exhaust pipe is provided on the top of the three-phase separator; The flue gas treatment equipment includes an air inlet duct, a filter barrel, an exhaust fan and an air outlet duct connected in sequence; The air intake pipe is communicated with the exhaust pipe.

4. A sewage treatment system according to claim 1, characterized in that: The first mud outlet is provided with a pump assembly, and the pump assembly is used to pump the mud from the first mud outlet to the first mud inlet.

5. A sewage treatment system according to claim 1, characterized in that: The aerobic pool is provided with an aeration device, the aeration device comprises a fan assembly and a filler assembly, and the fan assembly performs blast aeration through a fan; The packing component comprises a plurality of double rings, wherein the double rings comprise an outer ring and an inner ring, wherein the outer ring is a ring on which aldehyded fiber or polyester yarn is fixed, and the inner ring is a snowflake-shaped plastic branch.

6. The sewage treatment system according to claim 1, characterized in that: The sludge treatment equipment includes a chamber filter press, which includes a bracket, which includes two parallel beams, and a plurality of filter plates are slidably connected to the two beams. A clamping plate and a thrust plate are respectively provided at both ends of the bracket. An oil cylinder for driving the clamping plate is provided at one end of the bracket located at the clamping plate, grooves are provided on both side surfaces of the filter plates, and push plates are provided in the grooves. A driving component for driving the two push plates to move toward both sides is provided in the filter plate.

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