Sludge filter pressing device and method of multistage sludge-water separation system

Abstract

The invention provides a sludge filter-pressing device and method of a multistage sludge-water separation system, and belongs to the technical field of sludge treatment. The sludge filter-pressing device comprises a sludge primary separation and filtration device and a sludge secondary filter-pressing device; the sludge primary separating and filtering device comprises a primary filter pressing oil cylinder piston, a primary filtering and separating barrel and a sewage suction filtration device, an output part of the primary filter pressing oil cylinder piston extends into the primary filtering and separating barrel, and a water outlet of the primary filtering and separating barrel is connected with an inlet of the sewage suction filtration device; the output end of a secondary filter pressing oil cylinder piston in the sludge secondary filter pressing device, a sludge receiving device, a filter pressing spring and a filter pressing baffle are sequentially and coaxially arranged, an inlet of the sludge receiving device is connected with a sludge outlet of the primary filter separation barrel, and a water containing device is arranged below the sludge secondary filter pressing device; the step-by-step operation process that sludge is collected for filter pressing after sludge-water separation in the sewage treatment process is omitted, synchronous continuous operation of the sewage-sludge-water separation and sludge deep filter pressing process is achieved, and the sludge treatment process is simplified.

Description

Technical Field

[0001] This invention belongs to the field of sludge treatment technology, specifically relating to a sludge dewatering device and method for a multi-stage sludge-water separation system. Background Technology

[0002] Sludge is an extremely complex heterogeneous substance composed of organic debris, bacterial cells, inorganic particles, colloids, etc. It is a byproduct of wastewater treatment and its presence poses significant challenges to subsequent wastewater purification and disposal. Complete solid-liquid separation of sludge through sedimentation is difficult, making sludge-water separation crucial in wastewater treatment and directly impacting treatment effectiveness.

[0003] Sludge after mud-water separation generally has a water content exceeding 95% due to the presence of a large amount of bound water and interstitial water, exhibiting fluidized characteristics. This physical state not only poses a risk of leakage during transportation but also significantly increases transportation frequency and energy costs due to the low proportion of effective solid matter per unit volume. Current environmental regulations strictly control the entire sludge disposal process, clearly stipulating that pretreatment must achieve volume reduction and mass reduction. The core indicator requires reducing the water content to below 80% to avoid overloading equipment in subsequent terminal disposal stages such as thermal drying, incineration, or landfill, while effectively controlling the amount of chemicals added and energy consumption during treatment.

[0004] Patent CN219449530U discloses a sludge treatment machine with a grading and pressing mechanism and a sludge storage chamber. The machine includes a base, a sludge storage mechanism mounted on the bottom of the base via a stabilizing plate, and a sludge grading and processing box on the top of the base. A sludge input pipe is located at the top of the grading and processing box, and a first partition is sealed at the top of the grading and processing box. The sludge, after pressing, is pumped out by a high-pressure sludge pump and temporarily stored in the sludge storage box, thus avoiding the problem of sludge being discharged externally and unable to be recycled. When recycling is needed, the sludge can be pumped to other sludge treatment equipment, allowing for effective reuse of the treated sludge. This sludge treatment equipment, through multi-stage pressing, can thoroughly extract water from the sludge, improving sludge treatment efficiency. The entire device is housed in a single box, resulting in a relatively complex structure. Patent CN211921273U discloses a sludge filter press device, including a vertical filter press chamber and a horizontal filter press chamber located below and connected to the vertical filter press chamber. A first filter head is vertically slidably connected within the vertical filter press chamber, and the first filter head is connected to a first drive mechanism for vertical movement. A second filter head and a third filter head are horizontally slidably connected within the horizontal filter press chamber, and the second and third filter heads are respectively connected to a second drive mechanism for horizontal movement. A longitudinally arranged conveyor belt is provided outside the second discharge port of the horizontal filter press chamber, and the third filter head can slide out from the second discharge port and is located outside the conveyor belt. In this sludge pressure device, the position of the sludge changes when it enters the horizontal filter press chamber after the first filtration. After a second filtration, the portion far from the filtration interface of the vertical filter press chamber can be fully filtered, providing a staged filtration device, which is also implemented using the same set of equipment.

[0005] Traditional wastewater treatment processes involve multiple stages: at the initial stage, organic polymeric flocculants such as polyacrylamide or inorganic coagulants such as polyaluminum chloride are added to destabilize and aggregate colloidal particles into settleable flocs; after initial solid-liquid separation via gravity concentration or mechanical dewatering, secondary mechanical dewatering is required using specialized equipment such as plate and frame filter presses or belt filter presses. This segmented treatment model has significant systemic drawbacks: each treatment unit requires an independent power system and transmission device, resulting in large equipment footprints and high energy consumption; the operation involves complex procedures such as precise reagent dosing, periodic cleaning of filter cloths, and dynamic adjustment of filter press parameters, demanding high levels of expertise from operators; furthermore, the continuous use of flocculants can easily lead to an increase in the COD value of the filtrate, posing a potential risk of pollution transfer.

[0006] Existing technologies for mud-water separation and subsequent sludge dewatering equipment have problems such as large footprint, complex processing technology, high labor requirements, high energy consumption, and the need to add auxiliary additives during dewatering, filtration, and dewatering. Summary of the Invention

[0007] To address the problems existing in the prior art, this invention provides a sludge filter press device for a multi-stage sludge-water separation system, which solves the problems of complex processes in the prior art, such as sludge-water separation and subsequent filter press, as well as high workload, high energy consumption, and low efficiency in sludge dewatering and filter press processes.

[0008] To achieve the above objectives, in a first aspect, the present invention provides a sludge filter press device for a multi-stage sludge-water separation system, comprising a primary sludge separation and filtration device and a secondary sludge filter press device; the primary sludge separation and filtration device includes a primary filter cylinder piston, a primary filter separation tank, and a wastewater filtration device, wherein the output part of the primary filter cylinder piston extends into the primary filter separation tank, and the outlet of the primary filter separation tank is connected to the inlet of the wastewater filtration device; the secondary sludge filter press device includes a secondary filter cylinder piston, a sludge receiving device, a filter spring, an inclined holding plate, and a filter baffle, wherein the output end of the secondary filter cylinder piston, the sludge receiving device, the filter spring, and the filter baffle are arranged coaxially in sequence, the inlet of the sludge receiving device is connected to the sludge outlet of the primary filter separation tank, and a water holding device is provided below the secondary sludge filter press device.

[0009] Furthermore, the primary filtration separation tanks are mounted on a rotating platform, which is connected to a rotating shaft. There are four primary filtration separation tanks, arranged in pairs. The rotating shafts achieve reciprocating rotation via a motor and a positioning device. The piston of the primary filter press cylinder is mounted on the upper support platform, and a support frame is connected to both ends of the upper support platform. The support frame is positioned above the primary filtration separation tanks. A sludge slurry inlet is opened on the upper support platform, and the rotating platform is located below the upper support platform. Each primary filtration separation tank has a wastewater suction filtration device connected to its outlet. Two sets of secondary sludge filter press devices are provided.

[0010] Furthermore, the positioning device includes a positioning housing, a spring, and a locking block. The rotating shaft has a corresponding positioning slot. One end of the locking block is connected to the spring, and the other end is embedded in the positioning slot. The curvature of the positioning slot is π / 2. The positioning device is located on one side of the rotating shaft or the rotating shaft passes through the positioning device.

[0011] Furthermore, the wastewater filtration device includes a one-way valve, a three-way valve, a secondary wastewater filtration device, a filtration pump, and a pressure gauge arranged along the wastewater flow direction. The pressure gauge is installed at the straight section of the discharge pipe of the filtration pump, and the two outlets of the three-way valve are equipped with a secondary wastewater filtration device and a filtration pump.

[0012] Furthermore, a first slide rail and a second slide rail are provided on both sides of the filter press spring, and sliders are provided on both sides of the sludge receiving device. The sliders cooperate with the first slide rail and the second slide rail respectively. Limiting devices are provided on the first slide rail and the second slide rail. The first slide rail, the second slide rail and the filter press baffle are set on the base plate, and the base plate is connected to the support frame.

[0013] Furthermore, a cylindrical metal filter screen is installed inside the primary filtration separation tank, and the cylindrical metal filter screen is detachably connected to the primary filtration separation tank.

[0014] Furthermore, a flexible filter screen is installed inside the filter pressure spring.

[0015] Secondly, the present invention provides a sludge dewatering method for a multi-stage sludge-water separation system. Based on the sludge dewatering device of the aforementioned multi-stage sludge-water separation system, the raw sewage slurry enters the primary sludge filtration separation tank for primary separation, the sewage enters the sewage suction filtration device for suction filtration, and the sludge enters the secondary sludge dewatering device. The piston of the secondary dewatering cylinder drives the sludge receiving device to move, while the dewatering baffle cooperates with the piston of the secondary dewatering cylinder to squeeze the dewatering spring, further dewatering the sludge. After dewatering, the sludge falls through the gap during the extension of the dewatering spring under the action of gravity and is recovered. The dewatered sewage enters the water holding device.

[0016] Furthermore, the motor drives the rotating shaft to rotate forward and backward. Driven by the rotating shaft, the rotating platform alternately moves the primary filtration separation tank to below the sludge slurry inlet, so that the primary filtration separation tank works continuously. In each group, one primary filtration separation tank is subjected to primary filtration by the piston of the primary filter cylinder, while the other primary filtration separation tank is filled with sludge. After primary filtration, the sludge enters the secondary sludge filter press, and the sewage enters the sewage suction filter corresponding to the primary filtration separation tank.

[0017] Furthermore, in the sludge dewatering method of the multi-stage sludge-water separation system, the sludge from the two sets of primary filtration separation tanks enters two sets of secondary dewatering devices, which operate continuously.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects: the sludge filter press of the multi-stage sludge-water separation system of the present invention occupies a small area; it eliminates the step-by-step operation process of separating sludge and water and then collecting sludge for filter press during sewage treatment, realizing the synchronous and continuous operation of sludge-water separation and deep sludge filter press, greatly simplifying the sludge treatment process, reducing sludge dewatering costs, and having a good synergistic effect on subsequent sludge treatment processes; it solves the problems of cumbersome processes, complex equipment, and high treatment costs of existing sludge-water separation and subsequent filter press treatment technologies. The simultaneous separation of sludge and water in wastewater and subsequent sludge filtration avoids the problems of cumbersome processes and complex equipment in existing sludge separation and filtration technologies. It can significantly reduce the water content of sludge without the need for auxiliary additives. Furthermore, the design of the filter spring in the secondary sludge filtration device facilitates rinsing, solving the problems of easy clogging and difficult cleaning of traditional sludge filter screens. It also boasts lower manufacturing costs and convenient replacement.

[0019] Furthermore, the system structure of this device is compact. The design of the three-way valve and pressure gauge in the primary sludge separation unit can monitor the operation of the equipment in real time, and can ensure that the equipment can continue to operate normally while the filter screen on one side is blocked and needs to be replaced, so as to achieve continuous operation of the process.

[0020] Furthermore, the first slide rail, the second slide rail, and the slider provide good guidance for the sludge receiving device. Limiting devices are installed on the first and second slide rails, and a slider is installed on the side of the sludge receiving device. The device positioning during the filtration process is achieved through cooperation with the limiting devices to extend and retract the filter spring. Attached Figure Description

[0021] Figure 1 The present invention relates to a sludge dewatering device for a multi-stage sludge-water separation system.

[0022] Figure 2 This is a schematic diagram of the primary mud separation and filtration device of the present invention.

[0023] Figure 3 This is a schematic diagram of the rotating platform mechanism of the present invention.

[0024] Figure 4 This is a schematic diagram of the wastewater filtration device of the present invention.

[0025] Figure 5 This is a schematic diagram of the positioning device for the rotating platform of the present invention.

[0026] Figure 6 This is a schematic diagram of the sludge secondary filter press device of the present invention.

[0027] In the diagram, 1. Secondary filter press cylinder piston; 2. Sludge receiving device; 3. Support frame; 4. Rotating platform; 41. Sewage discharge pipe; 5. Primary filter separation tank; 51. Metal filter screen; 6. Control switch; 7. Sewage suction filtration device; 71. One-way valve; 72. Connecting pipe; 73. Three-way valve; 74. Pressure gauge; 75. Filter pump; 76. Secondary sewage filtration device; 8. Positioning device; 81. Positioning housing; 82. Clamping block; 83. Spring; 9. Primary filter press cylinder piston; 10. Rotating shaft; 11. Upper support platform; 12. Motor; 13. First slide rail; 14. Filter press spring; 15. Limiting device; 16. Second slide rail; 17. Inclined holding plate; 18. Filter press baffle. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," "outer," "one side," "one end," "one side," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0030] Reference Figure 1 The present invention provides a sludge filter press device for a multi-stage sludge-water separation system, comprising a primary sludge filter and a secondary sludge filter; the primary sludge filter is as follows: Figure 2 As shown, Figure (a) is a schematic diagram of the overall structure of the primary filtration separation tank 5, and Figure (b) is a schematic diagram of the cross-sectional structure along the BB direction of Figure (a). The rotating platform 4 is as follows: Figure 3 As shown in the figure, Figure (a) is a front view of the rotating platform 4, with only one primary filtration separation tank 5 remaining; Figure (b) is a cross-sectional view along the CC direction shown in Figure (a); and Figure (c) is an isometric view of the rotating platform 4, with only one primary filtration separation tank 5 remaining. The wastewater filtration device is as follows: Figure 4 As shown, the positioning device for the rotating platform 4 is as follows: Figure 5 As shown in Figure (a), which is a top view, and Figure (b), which is a side view, the sludge secondary filter press device is as follows: Figure 6 As shown. The primary sludge separation and filtration device is placed on the rotating platform 4 to achieve sludge-water separation and secondary filtration of the separated wastewater; the sludge slurry after sludge-water separation enters the secondary sludge pressure filter through the rotating platform 4, where the hydraulic cylinder piston pushes to complete the deep dewatering and pressure filtration of the sludge. The primary sludge separation and filtration device includes a primary pressure filter hydraulic cylinder piston 9, a primary filtration separation tank 5, a cylindrical metal filter screen 51, and a wastewater suction filter 7, wherein the wastewater suction filter 7 is as follows: Figure 4As shown, a one-way valve 71, a three-way valve 73, a secondary sewage filtration device 76, a vacuum pump 75, and a pressure gauge 74 are connected in sequence through a connecting pipe 72. The pressure gauge 74 is installed at the straight section of the discharge pipe of the vacuum pump 75. A cylindrical metal filter screen 51 is set inside the primary filtration separation tank 5, and the piston 9 of the primary filter cylinder is connected to the primary filtration separation tank 5.

[0031] The sludge secondary filter press device includes a secondary filter press cylinder piston 1, a sludge receiving device 2, a filter press spring 14, a first slide rail 13, a second slide rail 16, and a limiting device 15; as follows: Figure 1 As shown, the sludge receiving device 2 is located directly below the primary filtration separation tank 5 and is placed on the first slide rail 13 and the second slide rail 16. Figure 1 The sludge receiving device 2 shown is positioned in the locking position of the limiting device 15. The sludge receiving device 2 can move on the first slide rail 13 and the second slide rail 16 and is limited by the limiting device 15; as shown... Figure 6 As shown in the figure, Figure (a) is an isometric view of the sludge secondary filter press device, and Figure (b) is a top view of the sludge secondary filter press device. The piston 1 of the secondary filter press cylinder is located at one end of the sludge receiving device 2 and cooperates with its filter port to perform filter press work. The other end of the sludge receiving device 2 is connected to the filter press spring 14. The secondary filter press of sludge is achieved by the extension and retraction of the filter press spring 14 and the movement of the piston 1 of the secondary filter press cylinder. Limiting devices 15 are respectively set on the first slide rail 13 and the second slide rail 16. Sliding blocks are set on both sides of the sludge receiving device 2. The sliding blocks cooperate with the first slide rail 13 and the second slide rail 16 respectively. The device positioning is achieved by cooperating with the limiting devices 15 to extend the filter press spring 14 during the filter press process.

[0032] The rotary platform 4 used for connecting the primary and secondary sludge filter press devices is as follows: Figure 3 and Figure 1 As shown, the device includes a support frame 3, a rotating platform 4 with a sewage discharge pipe 41 and a rotating shaft 10. The rotating shaft 10 is connected to the output of the motor 12 and is connected to the inlet of the sewage filtration device 7 via the sewage discharge pipe 41. It also includes a support frame 3 and an upper support platform 11. The upper support platform 11 is used to install and connect the primary filter cylinder piston 9 and to open the sludge inlet. The two ends of the upper support platform 11 are connected to the support frame 3. The rotating platform 4 includes a positioning device 8, a rotating shaft 10, a motor 12, and a control switch 6. The control switch 6 connects the motor 12 and the control unit of the electric valve. The control switch 6 is used to control the electric valve and the motor 12. Both the one-way valve 71 and the three-way valve 73 are electric valves.

[0033] The positioning device 8 is connected to a rotating shaft 10 driven by a motor 12, which rotates 90° forward and backward. A control switch 6 is installed on the side of the rotating platform to control the pressure filtration operation of the primary sludge filtration separation tank 5 and the feeding of the secondary sludge pressure filtration unit. The positioning device 8 includes a positioning housing 81, a spring 83, and a locking block 82. The rotating shaft 10 has corresponding positioning slots. One end of the locking block 82 is connected to the spring, and the other end is embedded in the positioning slot. The arc of the positioning slot is π / 2. The positioning device 8 is located on one side of the rotating shaft or the rotating shaft passes through the positioning device. Figure 5 As shown, the locking block 82 is installed in the locking slots on both sides of the positioning housing 81 and is connected to the positioning housing 81 by the spring 83. There is a corresponding positioning slot on the rotating shaft. The linkage between the positioning device 8 and the positioning slot is used to realize the rotation of the rotating shaft in both directions of 90°, thereby ensuring the correct connection of the sludge primary filtration separation tank 5 and the sludge secondary filter press device, and realizing the continuous operation of the whole equipment.

[0034] The metal filter screen 51 inside the primary filtration separation tank 5 is replaceable, and the outer rings at both ends of the metal filter screen 51 are tightly connected to the inner wall of the primary filtration separation tank 5.

[0035] The raw sludge enters the primary sludge filtration device through the inlet of the upper support platform 11. The primary sludge filtration device includes a primary filtration separation tank 5, which contains a replaceable metal filter screen 51. Above the primary filtration separation tank 5 is a primary filter cylinder piston 9 driven by a filter cylinder, which is connected to a suction pump 75 to perform primary filtration of the raw sludge. The wastewater after primary filtration enters the secondary wastewater filtration device 76 through the connecting pipe 72 and the one-way valve 71, and is discharged through the pipe set on the rotating platform 4. It is worth noting that a pressure gauge 74 is connected to the pipe of the suction pump 75, which can be used to observe the blockage of the pipe by observing the pressure changes inside the pipe. If the connecting pipe 72 is blocked, the pipe of the other suction pump 75 can be opened through the three-way valve 73, so that the wastewater suction device 7 can continue to operate and clear the blockage in the pipe.

[0036] Sludge secondary filter press device such as Figure 4 As shown, it includes a secondary filter press cylinder piston 1, a sludge receiving device 2, a limiting device 15, a filter press spring 14, a first slide rail 13 and a second slide rail 16. The limiting device 15 is used to ensure that the primary filter press sludge accurately enters the sludge receiving device. The secondary filter press cylinder piston 1 serves as the power device for secondary sludge filtration. An inclined plate 17 is installed below the filter press spring 14 to achieve graded discharge of wastewater and sludge after secondary filtration.

[0037] Furthermore, a flexible filter screen can be installed inside the filter press spring. During filter pressing, the sludge is completely contained within the filter screen and is not easily leaked. After filter pressing is completed, the sludge can be removed along with the filter screen.

[0038] A sludge dewatering method for a multi-stage sludge-water separation system, wherein during operation, the bottom of the primary filtration separation tank 5 is sealed; the raw sewage slurry enters the primary filtration separation tank 5 through the feed inlet of the upper support platform 11. After feeding is completed, the continuous rotary platform 4 rotates 90° forward under the drive of the bottom motor 12; the two primary filter separation tanks 5 that have finished feeding start to work, and the other two idle primary filter separation tanks 5 start to feed. After the primary filtration separation tank 5 is completed, it starts to work. The piston 9 of the primary filter cylinder presses the sewage slurry for filtration. At the same time, the sewage suction filtration device 7 starts to work and suctions the sewage slurry. The sewage slurry undergoes preliminary mud-water separation through the metal filter screen 51 inside the primary filtration separation tank 5. The sewage after preliminary mud-water separation enters the secondary sewage filtration device 76 and the suction pump 75 through the one-way valve 71 and the three-way valve 73, and is finally discharged through the pipeline.

[0039] The pressure gauge 74 connected to the outlet pipe of the filtration pump 75 is used to detect the working status of the primary filtration separation tank 5; by monitoring the pressure change inside the pipeline during operation, it is determined whether the metal filter screen 51 inside the primary filtration separation tank and the secondary sewage filtration device 76 are blocked; the three-way valve 73 can be used to replace the filter screen while ensuring the continuous operation of the primary filtration separation tank 5 and the sewage filtration device 7.

[0040] After the primary separation of sludge and water is completed, the control switch 6 on the side of the continuous rotating platform is closed, and the electric valve at the bottom of the primary filtration separation tank 5 is opened; the sludge after primary filtration enters the secondary sludge filtration device under the push of the piston 9 of the primary filter cylinder.

[0041] After the sludge from the initial filtration has completely entered the secondary sludge filter press, the control switch 6 controls the electric valve at the bottom of the primary filtration separation tank 5 to close; at the same time, the rotating platform 4 rotates 90° in the opposite direction under the drive of the bottom motor 12, and the primary sludge separation filter device runs repeatedly and continuously.

[0042] After the primary filtration sludge completely enters the secondary sludge filter press, the secondary sludge filter press starts to work. Under the pressure of the piston 1 of the secondary filter press cylinder, the sludge enters the filter press spring 14. At the same time, the sludge receiving device 2 moves along the first slide rail 13 and the second slide rail 16 with the piston 1 of the secondary filter press cylinder, and works with the filter press baffle 18 to squeeze the filter press spring 14. The sewage and the filter sludge flow out from the inclined plate 17 during the compression and extension of the filter press spring 14.

[0043] After the secondary sludge filtration is completed, the sludge receiving device 2 and the piston 1 of the secondary filtration cylinder retract, and the filter spring 14 extends. The sludge after filtration falls through the gap during the extension of the filter spring 14 under the action of gravity and is recycled. At the same time, the sludge receiving device 2 resets on the first slide rail 13 and the second slide rail 16.

[0044] Two sludge secondary filter press devices are located below the continuous rotating platform 4, and four primary filtration separation tanks 5 for primary sludge separation are placed on the rotating platform 4. The rotating platform 4 is driven by motor 12 and runs continuously. The positioning device of the rotating platform is used to ensure the accurate connection of the primary filtration separation tanks 5 and the sludge secondary filter press devices, so as to realize the continuous operation of the whole equipment.

[0045] The sludge dewatering device of the multi-stage sludge-water separation system provided by this invention includes a primary filtration device for wastewater and sludge separation, a secondary sludge dewatering device, and a rotating platform. The primary filtration device includes a dewatering mechanism at the top of the tank, a replaceable metal filter screen inside the primary filtration tank 5, a one-way valve to maintain unidirectional wastewater flow, a three-way valve, a secondary wastewater dewatering device, a suction pump, and a pressure gauge. The pressure gauge is used to detect the working status of the secondary wastewater dewatering device. If the secondary wastewater dewatering device becomes clogged, a new secondary wastewater dewatering device can be connected by switching the three-way valve, and the filter screen of the clogged device can be replaced to ensure continuous operation of the equipment. The secondary sludge dewatering device includes a dewatering cylinder piston and a dewatering spring. The system comprises a spring, slide rail, and locking mechanism. Secondary sludge filtration is achieved through the extension of the filter spring and the compression motion of the filter cylinder piston. The rotating platform connecting the primary and secondary sludge filtration devices includes a motor drive, a rotating shaft, a rotating platform, an electric valve, and a rotating positioning device. The electric valve controls the connection and operation of the primary and secondary sludge filtration devices, the motor drive enables the rotating platform to rotate forward and backward, and the rotating positioning device ensures accurate connection between the primary and secondary sludge filtration devices. This allows for continuous operation of the multi-stage sludge filtration system. Furthermore, the devices described in this invention are separately configured and connected via pipelines and inlets / outlets, enabling continuous and efficient operation. The modular design also facilitates maintenance and upgrades.

[0046] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A sludge filter press device for a multi-stage sludge-water separation system, characterized in that, The device includes a primary sludge separation and filtration device and a secondary sludge pressure filter device. The primary sludge separation and filtration device consists of a primary pressure filter cylinder piston (9), a primary filtration separation barrel (5), and a sewage suction filter device (7). The output of the primary pressure filter cylinder piston (9) extends into the primary filtration separation barrel (5), and the outlet of the primary filtration separation barrel (5) is connected to the inlet of the sewage suction filter device (7). The secondary sludge pressure filter device includes a secondary pressure filter cylinder piston (1), a sludge receiving device (2), a filter spring (14), an inclined holding plate (17), and a filter baffle (18). The output end of the secondary pressure filter cylinder piston (1), the sludge receiving device (2), the filter spring (14), and the filter baffle (18) are arranged coaxially in sequence. The inlet of the sludge receiving device (2) is connected to the sludge outlet of the primary filtration separation barrel (5), and a water holding device is set below the secondary sludge pressure filter device.

2. The sludge filter press device for the multi-stage sludge-water separation system according to claim 1, characterized in that, The primary filtration separation tank (5) is set on the rotating platform (4), which is connected to the rotating shaft (10). There are four primary filtration separation tanks (5), arranged in pairs. The rotating shaft (10) achieves 90° reciprocating rotation through the motor (12) and the positioning device (8). The piston (9) of the primary filter cylinder is set on the upper support platform (11), and the support frame (3) is connected to both ends of the upper support platform (11). The support frame (3) is set above the primary filtration separation tank (5). The upper support platform (11) has a sludge slurry inlet, and the rotating platform (4) is located below the upper support platform (11). Each primary filtration separation tank (5) has a wastewater suction filtration device (7) connected to its outlet. There are two sets of sludge secondary filter press devices.

3. The sludge filter press device for the multi-stage sludge-water separation system according to claim 1, characterized in that, The positioning device (8) includes a positioning housing (81), a spring (83) and a locking block (82). The rotating shaft (10) has a corresponding positioning slot. One end of the locking block (82) is connected to the spring, and the other end is embedded in the positioning slot. The arc of the positioning slot is π / 2. The positioning device (8) is set on one side of the rotating shaft or the rotating shaft passes through the positioning device.

4. The sludge filter press device for the multi-stage sludge-water separation system according to claim 1, characterized in that, The sewage filtration device (7) includes a one-way valve (71), a three-way valve (73), a secondary sewage filtration device (76), a filtration pump (75), and a pressure gauge (74) arranged along the sewage flow direction. The pressure gauge (74) is installed at the straight section of the discharge pipe of the filtration pump (75). The two outlets of the three-way valve (73) are equipped with the secondary sewage filtration device (76) and the filtration pump (75).

5. The sludge filter press device for the multi-stage sludge-water separation system according to claim 1, characterized in that, The filter press spring (14) is provided with a first slide rail (13) and a second slide rail (16) on both sides. The sludge receiving device (2) is provided with sliders on both sides, and the sliders cooperate with the first slide rail (13) and the second slide rail (16) respectively. Limiting devices (15) are provided on the first slide rail (13) and the second slide rail (16). The first slide rail (13), the second slide rail (16) and the filter press baffle (18) are set on the bottom plate, and the bottom plate is connected to the support frame (3).

6. The sludge filter press device for a multi-stage sludge-water separation system according to claim 1, characterized in that, A cylindrical metal filter screen (51) is provided inside the primary filtration separation tank (5), and the cylindrical metal filter screen (51) is detachably connected to the primary filtration separation tank (5).

7. The sludge filter press device for a multi-stage sludge-water separation system according to claim 1, characterized in that, A flexible filter screen is provided inside the filter spring (14).

8. A sludge dewatering method for a multi-stage sludge-water separation system, characterized in that, Based on the sludge filter press of the multi-stage sludge-water separation system according to any one of claims 1-7, the raw sewage slurry enters the primary sludge filtration separation tank (5) for primary separation, the sewage enters the sewage suction filtration device (7) for suction filtration, and the sludge enters the secondary sludge filter press. The piston (1) of the secondary filter press cylinder drives the sludge receiving device (2) to move, and at the same time, the filter press baffle (18) cooperates with the piston (1) of the secondary filter press cylinder to squeeze the filter press spring (14) to further filter the sludge. After the filter press is completed, the sludge falls through the gap in the stretching process of the filter press spring (14) under the action of gravity and is recycled. The filtered sewage enters the water holding device.

9. The sludge dewatering method for a multi-stage sludge-water separation system according to claim 8, characterized in that, The motor (12) drives the rotating shaft (10) to rotate forward and reverse. The rotating platform (4) is driven by the rotating shaft (10) to transfer the primary filtration separation tank (5) to the bottom of the sludge slurry inlet in turn, so that the primary filtration separation tank (5) works continuously. One of the primary filtration separation tanks (5) in each group is initially filtered under the squeezing action of the piston (9) of the primary filter cylinder, while the other primary filtration separation tank (5) is filled with sludge. After the primary filtration is completed, the sludge enters the secondary sludge filter press, and the sewage enters the sewage suction filter (7) corresponding to the primary filtration separation tank (5).

10. The sludge dewatering method for a multi-stage sludge-water separation system according to claim 8, characterized in that, The sludge from the two primary filtration separation tanks (5) enters the two secondary filter presses respectively, and the secondary filter presses work continuously.

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