Gravity compression type sludge dewatering method and device

Abstract

The invention discloses a gravity compression type sludge dewatering method and device. The device mainly comprises a feeding unit, a gravity compression bin, a sewage recovery pool, a transfer unit, a sludge recovery pool and a loading tray recovery bin. Sludge is uniformly arranged in a loading tray of the gravity compression bin from the feeding unit, the loading unit conveys the loading tray and the sludge in the loading tray to the gravity compression bin, in the gravity compression bin, the sludge is naturally compressed under the action of gravity, water is separated, and the sludge flows into a sewage recycling pool below, so that preliminary dehydration is realized; the conveying unit conveys and recycles the dewatered sludge and the loading tray respectively, the sludge is conveyed to the sludge recycling pool for centralized treatment, and the loading tray is conveyed to the loading tray recycling bin for repeated use. According to the method and the device, the dehydration process is simplified in a gravity compression manner, the energy consumption is reduced, meanwhile, efficient recovery of sewage and the loading tray is realized, and the resource waste and the manual operation cost are reduced.

Description

Technical Field

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

[0002] Sludge dewatering is a key step in the sewage treatment process, aimed at reducing sludge volume and lowering subsequent treatment costs. Sludge mainly comes from sewage treatment plants and includes primary sludge, residual sludge and mixed sludge. It has a high water content and needs to be dehydrated to reduce volume, reduce transportation and treatment costs, reduce organic matter content, reduce corruption and odor, and facilitate subsequent incineration, landfill or agricultural use.

[0003] In the existing technology, traditional sludge dewatering methods, such as mechanical filter pressing and centrifugal dewatering, usually consume a lot of energy, have complex equipment and high maintenance costs. The present invention realizes a sludge dewatering device with simple structure, high efficiency, low energy consumption and full utilization of gravity, and a corresponding treatment method. It aims to solve the problems of low dewatering efficiency, complex equipment, high energy consumption, and poor dewatering effect in the existing sludge dewatering technology. Through the innovative device structure and work process, the sludge dewatering treatment is made efficient, economical and automated. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies in the above-mentioned technologies and to propose a method and device for gravity compression sludge dewatering, aiming to solve the above-mentioned technical problems.

[0005] The present invention provides a method and device for gravity compression sludge dewatering, comprising a feeding unit, wherein sludge is placed in a stirring tank in the feeding unit, and the feeding unit is used to transport the sludge in the stirring tank to a gravity compression bin, and a sewage recovery tank is provided below the gravity compression bin. The sludge in the loading tray in the gravity compression bin and the loading tray are respectively transported and recovered by a transfer unit, and the recovered sludge and the loading tray fall into the sludge recovery tank and the charging tray recovery bin respectively.

[0006] Preferably, the feeding unit includes a stirring tank, the stirring tank is connected to a feeding machine for conveying sludge, and one side of the feeding machine is connected to a distributing machine.

[0007] Preferably, the charging tray is in the shape of an inverted trapezoidal box with a large opening and a small base, a plurality of filter holes are provided at the bottom thereof, and a filter cloth is provided inside the charging tray.

[0008] Preferably, the gravity compression bin includes a first-level compression bin and a second-level compression bin, and both the first-level compression bin and the second-level compression bin are provided with a supporting assembly and a lifting assembly. The supporting assembly is detachably connected to the loading tray, and the lifting assembly includes a motor, which drives the supporting assembly to drive the loading tray to move up and down in the vertical direction.

[0009] Preferably, the transfer unit includes a primary transfer unit and a secondary transfer unit. The primary transfer unit is used to transfer the loading tray in the primary compression bin to the secondary compression bin. The loading tray in the secondary compression bin is stacked in the opposite order to the loading tray in the primary compression bin. The secondary transfer unit transports the loading tray in the secondary compression bin to the top of the sludge recovery tank and unloads the sludge in the loading tray into the sludge recovery tank through the flipping mechanism. The loading tray is sent to the loading tray recovery bin via the secondary transfer unit and then transported to the primary compression bin.

[0010] Preferably, the first compression chamber and the second compression chamber are connected to a first sewage collection tank and a second sewage collection tank below them respectively.

[0011] Preferably, the steps include: S1. Loading process: The sludge in the mixing tank is transported to the distribution machine through the loader, and the distribution machine evenly distributes the sludge into the loading tray to ensure dehydration efficiency; S2, Gravity Compression Treatment: Multiple loading trays are arranged in sequence in the first-level gravity compression bin, relying on the sludge's own gravity to generate pressure to promote drainage. The sludge is then transferred to the second-level gravity compression bin and stacked in reverse for further dehydration. S3. Transfer operation: The first-level transfer unit transfers the loading tray from the first-level gravity compression bin to the second-level gravity compression bin. The second-level transfer unit sends the dewatered sludge in the second-level gravity compression bin to the sludge recovery tank and sends the loading tray to the loading tray recovery bin. At the same time, the empty loading tray in the loading tray recovery bin is transferred to the first-level gravity compression bin to prepare for the second batch of sludge dewatering.

[0012] Compared with the existing technology, it has the following beneficial effects: The present invention provides a method and device for gravity compression sludge dewatering. First, it has a feeding unit, which is responsible for conveying the sludge to the loading tray in the gravity compression bin. This step solves the problem of automatic sludge transportation, reduces manual operation, and improves efficiency. Then, there is a sewage recovery tank under the gravity compression bin. The sludge is compressed by gravity in the compression bin, and the water is squeezed out and flows into the sewage recovery tank. This step solves the problem of sludge dewatering and effectively reduces the volume and water content of the sludge. Then, there is a transfer unit in the device, which is responsible for The compressed sludge and charging tray are respectively transferred to the sludge recovery tank and the charging tray recovery bin. This step solves the problem of automatic separation and recovery of the sludge and the charging tray, avoids secondary pollution, and also realizes the recycling of the charging tray. In general, this set of equipment realizes the automatic transportation, efficient dehydration, automatic separation and recovery of sludge through the technical means of loading unit, gravity compression bin, sewage recovery tank, sludge recovery tank and transfer unit, and finally achieves the effect of reducing sludge volume, reducing water content, improving treatment efficiency, saving energy consumption and realizing resource recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 A schematic diagram of a gravity compression sludge dewatering method and apparatus according to the present invention; Figure 2 for Figure 1 A schematic diagram of the enlarged structure of the middle part A; Figure 3 for Figure 1 Schematic diagram of the enlarged structure of part B in the middle.

[0015] In the figure, 1. loading tray; 2. sludge recovery tank; 3. charging tray recovery bin; 4. mixing tank; 5. loader; 6. material distributor; 7. primary compression bin; 8. secondary compression bin; 9. primary transfer unit; 10. secondary transfer unit; 11. primary sewage collection tank; 12. secondary sewage collection tank. DETAILED DESCRIPTION

[0016] In order to make it easier to understand the structure of the present invention and the functional features and advantages that can be achieved, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings: Example 1: like Figures 1 to 3 As shown, the present invention provides a method and device for gravity compression sludge dewatering, including a feeding unit, in which sludge is placed in a stirring tank 4 in the feeding unit, and the feeding unit is used to transport the sludge in the stirring tank 4 to a gravity compression bin, and a sewage recovery tank is provided below the gravity compression bin. The sludge in the loading tray 1 in the gravity compression bin and the loading tray 1 are respectively transferred and recovered by the transfer unit, and the transferred and recovered sludge and the loading tray 1 are respectively dropped into the sludge recovery tank 2 and the charging tray 1 recovery bin.

[0017] During use, the sludge is placed in the loading tray 1, and then the loading unit will transport the loading tray 1 to the gravity compression bin. In the gravity compression bin, the sludge will be compressed due to its own weight, and the water will be squeezed out and flow into the sewage recovery pool below, thus realizing the dehydration of the sludge. Next, the transfer unit sends the dehydrated sludge and the empty loading tray 1 to different places: the dehydrated sludge is sent to the sludge recovery pool 2, and the loading tray 1 is sent back to the loading tray 1 recovery bin for continued use next time. The entire equipment has a simple structure, low energy consumption, high working efficiency, and good dehydration effect. It is both efficient and labor-saving. Through innovative device structure and work flow, the sludge dehydration treatment is efficient, economical and automated.

[0018] Example 2: like Figures 1 to 3 As shown, combined with the technical solution of Example 1, in this technical solution, the feeding unit includes a stirring tank 4, a feeding machine 5 for conveying sludge is connected to the stirring tank 4, and a distributor 6 is connected to one side of the feeding machine 5. First, the sludge will be put into a stirring tank 4. The purpose of the stirring tank 4 is to fully mix the various components in the sludge and prevent the solid particles in the sludge from settling, so that the sludge remains in a uniform state and ensures the consistency of the sludge properties in the subsequent treatment process. Then, the stirred sludge is transported by the feeding machine 5. Then, one side of the feeding machine 5 is connected to a distributor 6. The distributor 6 will evenly distribute the sludge into the charging tray 1 to ensure that the amount of sludge in each charging tray 1 is consistent, avoiding the decrease in dehydration efficiency due to uneven distribution of sludge, so that the subsequent dehydration effect will be more stable. The entire process, from stirring, conveying to packaging, is completed automatically, which is both efficient and labor-saving, and is well prepared for the subsequent dehydration treatment.

[0019] Furthermore, the loading tray 1 is in the shape of an inverted trapezoidal box with a large opening and a small base. A number of filter holes are provided at the bottom of the loading tray 1, and a filter cloth is provided inside the loading tray 1. When the sludge is loaded into the loading tray 1, because there are filter holes and filter cloth at the bottom of the loading tray 1, the water in the sludge will slowly flow out of the filter holes, while the sludge will be retained in the tray. The inverted trapezoidal design makes the loading tray 1 fit more tightly, making it easier for the upper and lower loading trays to be compressed, facilitating the discharge of water. The filter cloth can prevent the sludge from overflowing from the opening or other parts of the loading tray 1, ensuring that the sludge is dehydrated in the loading tray 1 and avoiding contamination of other components in the device. The entire process is both efficient and practical, greatly reducing the energy consumption of the sludge dehydration process.

[0020] Furthermore, the gravity compression bin includes a first-level compression bin 7 and a second-level compression bin 8. Both the first-level compression bin 7 and the second-level compression bin 8 are provided with a supporting assembly and a lifting assembly. The supporting assembly is detachably connected to the charging tray 1. The lifting assembly includes a motor. The motor drives the supporting assembly to drive the charging tray 1 to move up and down in the vertical direction. When the charging tray 1 is sent to the first-level compression bin 7, the lifting assembly will drive the charging tray 1 to slowly descend. Under the action of gravity, the weight of the upper charging tray 1 will generate pressure on the sludge in the lower charging tray 1, promoting the discharge of water. The weight of the sludge itself is used to squeeze the water out of the filter holes at the bottom. Then, the charging tray 1 will be transferred to the second-level compression bin 8, where it will be compressed again for further dehydration. The lifting assembly includes a first threaded rod. The motor drives the first threaded rod to rotate. A threaded sleeve is threadedly connected to the first threaded rod. A connecting rod is installed on the threaded sleeve. The connecting rod passes through the first-level compression bin 7 and The slide on the side wall of the secondary compression bin 8 is equipped with a telescopic cylinder on the mounting plate at the other end of the connecting rod. The telescopic end of the telescopic cylinder can be engaged with the connecting part on the outer wall of the charging tray 1. When the charging tray 1 needs to be moved in the vertical direction, the telescopic end of the telescopic cylinder is inserted into the connecting part on the outer side of the charging tray, and then the motor is started to drive the first threaded rod to rotate, driving the threaded sleeve on it to move along the length direction of the first threaded rod. When the sewage in the charging tray 1 is discharged, the telescopic end of the telescopic cylinder is moved out of the connecting part on the charging tray 1, so that the charging tray falls onto the conveyor belt below and continues to move forward.

[0021] Furthermore, the transfer unit includes a first-level transfer unit 9 and a second-level transfer unit 10. The first-level transfer unit 9 is used to transfer the charging tray 1 in the first-level compression bin 7 to the second-level compression bin 8. The charging tray 1 in the second-level compression bin 8 is stacked in the opposite order to the charging tray 1 in the first-level compression bin 7. The second-level transfer unit 10 transports the charging tray 1 in the second-level compression bin 8 to the top of the sludge recovery tank 2 and unloads the sludge in the charging tray 1 into the sludge recovery tank 2 through the flipping mechanism. The charging tray 1 is sent to the charging tray 1 recovery bin via the second-level transfer unit 10 and then transported to the first-level compression bin 7. First, the first-level transfer unit 9 will transfer the loading tray 1 that has been preliminarily dehydrated in the first-level compression bin 7 to the second-level compression bin 8. In the second-level gravity compression bin, the loading tray 1 will be stacked in the opposite order to the first-level gravity compression bin, which can further compress the sludge and improve the dehydration effect. In the gravity compression bin, when the loading trays 1 are stacked up and down, the bottom surface of the upper loading tray 1 can be placed in the opening of the lower loading tray 1, realizing a compact stacking method and increasing the sludge processing capacity per unit space. In addition, the weight of the upper loading tray 1 will exert pressure on the sludge in the lower loading tray 1, and the trapezoidal structure of the loading tray 1 will make the upper and lower loading trays 1 embedded in each other, guiding this pressure to be transmitted downward, and promoting the discharge of water in the sludge under the action of gravity. Then, the second-level transfer unit 10 will transport the loading tray 1 in the second-level compression bin 8 to the top of the sludge recovery tank 2, and pour the sludge in the loading tray 1 into the sludge recovery tank 2 through a flipping mechanism to complete the sludge recovery. The final recycling, finally, the empty loading tray 1 will be sent to the charging tray 1 recovery bin by the secondary transmission unit 10, and then sent back to the primary compression bin 7, ready for the next round of use. The turning mechanism includes a second threaded rod, a moving part is threadedly connected to the second threaded rod, and a mounting platform is fixed on the moving part, and a pushing cylinder is fixed on one side of the pushing cylinder. A driving motor is installed on the outer side of the driving motor, and a fixing frame is provided. The driving motor is slidably connected with the fixing frame, and the output shaft of the driving motor is engaged with the connecting part on the outer wall of the charging tray 1. When the charging tray 1 needs to be turned over and dumped, the driving motor is pushed on the mounting platform by the pushing cylinder until the output shaft of the driving motor is inserted into the connecting part on the outer wall of the charging tray 1, and then the driving motor is started to drive the charging tray 1 to turn over and dump the soil. A guide rod is also provided on the moving part to prevent the moving part from rotating, and the moving part is driven to move only along the length direction of the second threaded rod.

[0022] Furthermore, the lower parts of the primary compression chamber 7 and the secondary compression chamber 8 are connected to a primary sewage collection tank 11 and a secondary sewage collection tank 12, respectively. When the loading tray 1 is compressed in the primary compression chamber 7, the water in the sludge will flow out through the filter holes at the bottom of the loading tray 1 and flow directly into the primary sewage collection tank 11. Then, the loading tray 1 is transferred to the secondary compression chamber 8 for another compression. At this time, the remaining water will continue to be squeezed out and flow into the secondary sewage collection tank 12. In this way, the two sewage collection tanks collect sewage at different stages respectively, which is convenient for subsequent sewage treatment and ensures that the entire dehydration process is clean and efficient. The entire process is completed automatically, which is both convenient and environmentally friendly. The collected sewage needs to be further treated to meet the discharge standards or be reused.

[0023] Further, the following steps are included: S1. Loading process: The sludge in the mixing tank 4 is transported to the distributor 6 via the loader 5. The distributor 6 evenly distributes the sludge into the loading tray 1 to ensure dehydration efficiency; S2, gravity compression treatment: multiple loading trays 1 are arranged in sequence in the first-level gravity compression bin, relying on the sludge's own gravity to generate pressure to promote drainage, and then transferred to the second-level gravity compression bin and stacked in reverse for further dehydration; S3, transfer operation: the first-level transfer unit 9 transfers the loading tray 1 from the first-level gravity compression bin to the second-level gravity compression bin, and the second-level transfer unit 10 sends the dehydrated sludge in the second-level gravity compression bin to the sludge recovery tank 2 and sends the loading tray 1 to the loading tray 1 recovery bin. At the same time, the empty loading tray 1 in the loading tray 1 recovery bin is transferred to the first-level gravity compression bin to prepare for the second batch of sludge dehydration. First, the sludge will be placed in the mixing tank 4 and stirred evenly. Then, the sludge will be evenly loaded into the loading tray 1 through the loader 5 and the distributor 6 to ensure that the amount of sludge in each loading tray 1 is consistent, so that the dehydration effect will be more stable. Next, the loading tray 1 filled with sludge will be sent to the first-level gravity compression bin, where the sludge will be compressed by its own weight, and the water will slowly flow out from the filter holes at the bottom. After compression for a period of time, the loading tray 1 will be transferred to the secondary gravity compression bin by the primary transfer unit 9, where the loading tray 1 will be stacked in reverse for further compression and dehydration. Finally, the secondary transfer unit 10 will send the dehydrated sludge to the sludge recovery tank 2, and the empty loading tray 1 will be sent back to the charging tray 1 recovery bin to prepare for the next round of use. The entire process from stirring, loading, compression to recycling is completed automatically, which is both efficient and labor-saving, and ultimately achieves the effect of reducing sludge volume, recovering water and realizing the recycling of the loading tray 1.

[0024] The working principle of the gravity compression sludge dewatering method and device of the present application is as follows: First, the sludge will be placed in a mixing tank 4 and stirred evenly, and then the sludge will be evenly loaded into a special loading tray 1 through a loader 5 and a distributor 6. The loading tray 1 is in an inverted trapezoidal shape with many filter holes at the bottom and filter cloth inside to facilitate water filtration. Next, the loading tray 1 filled with sludge will be sent to the first-level gravity compression bin, where the sludge will be compressed by its own weight, and the water will flow through the filter holes into the sewage collection tank below. After a period of compression, the loading tray 1 will be transferred to the second-level gravity compression bin by the first-level transfer unit 9, where the loading tray 1 will be stacked in reverse for further The sludge is compressed and dehydrated in the second step, and the water flows into the secondary sewage collection tank 12 again. Finally, the dehydrated sludge will be sent to the sludge recovery tank 2 by the secondary transfer unit 10, and the empty loading tray 1 will be sent back to the loading tray 1 recovery bin to prepare for the next round of use. The entire process from sludge stirring, loading, compression and dehydration to final recovery is completed automatically, which is both efficient and labor-saving, and achieves the effect of reducing sludge volume, recovering water and realizing the recycling of the loading tray 1. In addition, the device has a simple structure, low maintenance cost, low energy consumption and high efficiency during use, and realizes the efficiency, economy and automation of sludge dewatering treatment.

[0025] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, use the above technical content to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. Therefore, any changes, modifications, equivalent changes and modifications made to the above embodiments based on the technology of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the present technical solution.

Claims

1. A gravity compression sludge dewatering device, characterized in that: The invention comprises a feeding unit, wherein the sludge is placed in a stirring tank (4) in the feeding unit, and the feeding unit is used to transport the sludge in the stirring tank (4) to a gravity compression bin. A sewage recovery tank is provided below the gravity compression bin. The sludge in the charging tray (1) in the gravity compression bin and the charging tray (1) are respectively transferred and recovered by the transfer unit, and the transferred and recovered sludge and the charging tray (1) are respectively dropped into the sludge recovery tank (2) and the charging tray (1) recovery bin.

2. A gravity compression sludge dewatering device according to claim 1, characterized in that: The feeding unit comprises a stirring tank (4), a feeding machine (5) for conveying sludge is connected to the stirring tank (4), and a distributor (6) is connected to one side of the feeding machine (5).

3. A gravity compression sludge dewatering device according to claim 2, characterized in that: The charging tray (1) is in the shape of an inverted trapezoidal box with a large opening and a small base, and a plurality of filter holes are provided at the bottom thereof. A filter cloth is provided inside the charging tray (1).

4. The gravity compression sludge dewatering device according to claim 1, characterized in that: The gravity compression bin comprises a first-stage compression bin (7) and a second-stage compression bin (8), wherein a supporting assembly and a lifting assembly are provided in each of the first-stage compression bin (7) and the second-stage compression bin (8), wherein the supporting assembly is detachably connected to the loading tray (1), and the lifting assembly comprises a motor, wherein the motor drives the supporting assembly to drive the loading tray (1) to move up and down in a vertical direction.

5. The gravity compression sludge dewatering device according to claim 4, characterized in that: The transfer unit comprises a primary transfer unit (9) and a secondary transfer unit (10). The primary transfer unit (9) is used to transfer the charging tray (1) in the primary compression bin (7) to the secondary compression bin (8). The charging tray (1) in the secondary compression bin (8) is stacked in the opposite order to the charging tray (1) in the primary compression bin (7). The secondary transfer unit (10) transports the charging tray (1) in the secondary compression bin (8) to the top of the sludge recovery tank (2) and unloads the sludge in the charging tray (1) into the sludge recovery tank (2) through a turning mechanism. The charging tray (1) is transported to the charging tray (1) recovery bin via the secondary transfer unit (10) and then transported to the primary compression bin (7).

6. The gravity compression sludge dewatering device according to claim 4, characterized in that: The lower parts of the primary compression chamber (7) and the secondary compression chamber (8) are respectively connected to a primary sewage collection tank (11) and a secondary sewage collection tank (12).

7. The dewatering method of a gravity compression sludge dewatering device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Loading process: The sludge in the mixing tank (4) is transported to the distribution machine (6) via the loading machine (5). The distribution machine (6) evenly distributes the sludge into the loading tray (1) to ensure dehydration efficiency; S2, gravity compression treatment: multiple loading trays (1) are arranged in sequence in the first-level gravity compression bin, relying on the sludge's own gravity to generate pressure to promote drainage, and then transferred to the second-level gravity compression bin and stacked in reverse for further dehydration; S3. Transfer operation: The first-level transfer unit (9) transfers the loading tray (1) from the first-level gravity compression bin to the second-level gravity compression bin, and the second-level transfer unit (10) sends the dewatered sludge in the second-level gravity compression bin to the sludge recovery tank (2) and sends the loading tray (1) to the loading tray (1) recovery bin. At the same time, the empty loading tray (1) in the loading tray (1) recovery bin is transferred to the first-level gravity compression bin to prepare for the second batch of sludge dewatering.

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