Sludge filter-pressing dehydration device

Abstract

The utility model discloses a sludge filter-pressing dehydration device, and relates to the technical field of sludge dehydration equipment. The sludge compressing and dewatering device comprises a homogenizing tank, a squeezing water tank, a blowback gas storage tank, a vacuum pump, a hot air unit and a double-diaphragm filter press, the homogenizing tank is connected with the double-diaphragm filter press through a filter press feeding pump, the squeezing water tank is connected with the double-diaphragm filter press through a squeezing pipeline, the double-diaphragm filter press is connected with a back flushing pipeline, a three-way pneumatic valve is arranged on the back flushing pipeline, a compressed air pipeline is arranged between a back flushing air storage tank and the three-way pneumatic valve, and the back flushing air storage tank is connected with the double-diaphragm filter press. The vacuum pump is connected with the double-diaphragm filter press through a vacuum pipeline, and the hot air unit is connected with the double-diaphragm filter press through a hot air outlet pipeline. According to the sludge filter-pressing dehydration device provided by the utility model, the hot air unit and the vacuum pump are arranged, and the moisture content of sludge is further reduced by virtue of contact between hot air and a filter-pressed sludge cake after filter pressing of the double-diaphragm filter press.

Description

Technical Field

[0001] This utility model relates to the technical field of sludge dewatering equipment, and in particular to a sludge dewatering device by pressure filtration. Background Technology

[0002] High moisture content is one of the main factors limiting the efficiency of sludge treatment and disposal. A series of standards and regulations for sludge transportation, pyrolysis, incineration, and land application in urban wastewater treatment plants all specify technical requirements for moisture content. Dewatering is a common key technical step in all types of sludge treatment and disposal routes. However, sludge is a highly heterogeneous system with a mixture of organic and inorganic components, exhibiting a stable colloidal flocculent state, making solid-liquid separation extremely difficult. Dewatering and conditioning are crucial for improving sludge dewatering performance and effectively achieving solid-liquid separation.

[0003] In industries such as sludge treatment, chemical conditioning methods are commonly used to condition sludge. This process breaks down the cell walls of microorganisms in the sludge, releasing the water inside the cells as free water. After conditioning, the sludge is fed into a diaphragm filter press via a feed pump. During the feeding process, a certain feeding pressure is applied to squeeze out most of the water from the sludge. After feeding is completed, a pressing pump further squeezes the sludge in the filter press chamber to remove more water, ultimately reducing the sludge's moisture content.

[0004] However, existing sludge dewatering technologies have the following drawbacks: 1. The sludge moisture content cannot be further reduced by sludge conditioning and modification filter pressing alone, which cannot meet the requirement of low sludge cake moisture content; 2. Because the filter plates of the filter press contain stagnant water, the stagnant water falls further into the sludge cake conveying device and mixes with the sludge cake during the plate opening process, further increasing the sludge cake moisture content. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model proposes a sludge dewatering device by pressure filtration.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A sludge dewatering device is provided, comprising a homogenization tank, a pressing water tank, a backflushing air storage tank, a vacuum pump, a hot air unit, and a double diaphragm filter press. The homogenization tank is connected to the double diaphragm filter press via a filter press feed pump. The pressing water tank is connected to the double diaphragm filter press via a pressing pipeline. The double diaphragm filter press is connected to a backflushing pipeline, which is equipped with a three-way pneumatic valve. A compressed air pipeline is provided between the backflushing air storage tank and the three-way pneumatic valve. The vacuum pump is connected to the double diaphragm filter press via a vacuum pipeline. The hot air unit is connected to the double diaphragm filter press via a hot air outlet pipeline.

[0008] Preferably, the homogenization tank is connected to a conditioned sludge pipeline.

[0009] Preferably, the dual-diaphragm filter press is connected to a wastewater treatment system via pipeline.

[0010] Furthermore, the double diaphragm filter press is connected to a filtrate discharge pipeline, and the filtrate discharge pipeline is equipped with a filtrate discharge pneumatic valve.

[0011] Furthermore, a sludge inlet pneumatic valve is provided between the homogenization tank and the filter press feed pump, and a filter press sludge inlet pipeline is provided between the double diaphragm filter press and the filter press feed pump, with a filter press sludge inlet pneumatic valve provided on the filter press sludge inlet pipeline.

[0012] Furthermore, the filter press inlet pipe is also connected to a backflushing return pipe, and the backflushing return pipe is equipped with a sludge return pneumatic valve.

[0013] Furthermore, the pressing pipeline is sequentially equipped with a pressing pump and a pressing water inlet pneumatic valve.

[0014] Furthermore, the hot air outlet duct is sequentially equipped with a hot air unit outlet pneumatic valve and a filter press hot air inlet valve, and a negative pressure tank is also provided between the vacuum pump and the vacuum duct.

[0015] Furthermore, the sludge dewatering device also includes a PLC control module, which is connected to the double diaphragm filter press.

[0016] Furthermore, the pressing water tank is also connected to a pressing water return pipeline, and a pressing water return pneumatic valve is provided on the pressing water return pipeline. The pressing water return pneumatic valve is located between the pressing water tank and the pressing water inlet pneumatic valve.

[0017] Furthermore, the sludge dewatering device also includes an air compressor, which is connected to a backflushing air tank.

[0018] Furthermore, the sludge dewatering device also includes an instrument air tank, which is connected between the compressed air pipeline and the backflushing air tank.

[0019] This utility model provides a sludge dewatering device with the following advantages:

[0020] (1) Set up a hot air unit and a vacuum pump. After the double diaphragm filter press is used for filtration, the hot air comes into contact with the sludge cake after filtration to remove the water from the sludge cake and further reduce the water content of the sludge.

[0021] (2) Unlike traditional sludge filter press, the sludge in the double diaphragm filter press is purged a second time by setting up a backflush pipeline, which further reduces the moisture content of the sludge and significantly reduces the cost of sludge transportation and disposal. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the sludge dewatering device according to an embodiment of the present invention;

[0024] Explanation of the markings in the image:

[0025] 1- Conditioned sludge pipeline; 2- Equalization tank; 3- Hot air unit; 4- Sludge inlet pump and pneumatic valve; 5- PLC control module; 6- Filter press feed pump; 7- Filter press sludge inlet pneumatic valve; 8- Filter press sludge inlet pipeline; 9- Sludge return pneumatic valve; 10- Filtrate discharge pipeline; 11- Filter press hot air inlet valve; 12- Double diaphragm filter press; 13- Backflush pipeline; 14- Three-way pneumatic valve; 15- Vacuum pipeline; 16- Press 17-Compressed air pipeline; 18-Negative pressure tank; 19-Vacuum pump; 20-Air compressor; 21-Backflush air tank; 22-Instrument air tank; 23-Pressing pipeline; 24-Filtration discharge pneumatic valve; 25-Backflush return pipeline; 26-Pressing water inlet pneumatic valve; 27-Hot air unit outlet pneumatic valve; 28-Hot air outlet pipeline; 29-Pressing water return pneumatic valve; 30-Pressing water return pipeline; 31-Pressing water tank. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing the present 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. Therefore, they should not be construed as limitations on the present invention.

[0028] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Example

[0030] Please see Figure 1 The sludge dewatering device shown includes a homogenization tank 2, a pressing water tank 31, a backflushing air storage tank 20, a vacuum pump 18, a hot air unit 3, and a double diaphragm filter press 12. The homogenization tank 2 is connected to a conditioned sludge pipeline 1, and the homogenization tank 2 is connected to the double diaphragm filter press 12 via a filter press feed pump 6. A sludge inlet pneumatic valve 4 is provided between the homogenization tank 2 and the filter press feed pump 6, and a filter press sludge inlet pipeline 8 is provided between the double diaphragm filter press 12 and the filter press feed pump 6. A filter press sludge inlet pneumatic valve 7 is provided on the filter press sludge inlet pipeline 8. The filter press sludge inlet pipeline 8 is also connected to a backflushing return pipeline 24, and a sludge return pneumatic valve 9 is provided on the backflushing return pipeline 24. The double diaphragm filter press 12 is connected to a filtrate discharge pipeline 10, and a filtrate discharge pneumatic valve 23 is provided on the filtrate discharge pipeline 10. The pressing water tank 31 is connected to the double diaphragm filter press 12 via a pressing pipeline 22. A pressing pump 29 and a pressing water inlet pneumatic valve 25 are sequentially installed on the pressing pipeline 22. The pressing water tank 31 is also connected to a pressing water return pipeline 30, which is equipped with a pressing water return pneumatic valve 28. The pressing water return pneumatic valve 28 is positioned between the pressing water tank 31 and the pressing water inlet pneumatic valve 25.

[0031] The double diaphragm filter press 12 is connected to a backflush pipeline 13, which is equipped with a three-way pneumatic valve 14. A compressed air pipeline 16 is provided between the backflush air storage tank 20 and the three-way pneumatic valve 14. The vacuum pump 18 is connected to the double diaphragm filter press 12 through a vacuum pipeline 15. The hot air unit 3 is connected to the double diaphragm filter press 12 through a hot air outlet pipeline 27. A hot air outlet pneumatic valve 26 and a filter press hot air inlet valve 11 are sequentially provided on the hot air outlet pipeline 27. A negative pressure tank 17 is also provided between the vacuum pump 18 and the vacuum pipeline 15.

[0032] The sludge dewatering device further includes a PLC control module 5, an air compressor 19, and an instrument air tank 21. The PLC control module 5 is connected to a double diaphragm filter press 12, the air compressor 19 is connected to a backflushing air tank 20, and the instrument air tank 21 is connected between the compressed air pipeline 16 and the backflushing air tank 20. The double diaphragm filter press 12 is connected to a wastewater treatment system via pipelines.

[0033] The operation of a sludge dewatering filter press consists of the following stages:

[0034] 1. Storage stage: The conditioned sludge is transported to the homogenization tank 2 through the conditioned sludge pipeline 1 for temporary storage;

[0035] 2. Sludge feeding stage: Open the sludge feeding pump pneumatic valve 4, the filter press sludge feeding pneumatic valve 7, and the filtrate discharge pneumatic valve 23. The sludge after conditioning in the homogenization tank 2 is transported into the double diaphragm filter press 12 through the filter press sludge feeding pipeline 8 via the filter press feed pump 6. The double diaphragm filter press 12 is equipped with multiple filter plates, and a filter pressing chamber is formed between two adjacent filter plates. When the filter pressing chamber in the double diaphragm filter press 12 is filled with sludge, the feeding is completed. Then close the sludge feeding pump pneumatic valve 4, the filter press sludge feeding pneumatic valve 7, and the filtrate discharge pneumatic valve 23.

[0036] 3. Pressing stage: Open the press water inlet pneumatic valve 25 and the filtrate discharge pneumatic valve 23, close the press water return pneumatic valve 28, and use the press pump 29 to transport the water in the press water tank 31 into the diaphragm chamber of the double diaphragm filter press 12. Each diaphragm filter plate has a sealed diaphragm chamber, which squeezes and presses the sludge in the filter chamber. The water in the sludge is discharged to the sewage treatment system through the filtrate discharge pipe 10.

[0037] 4. Purging Stage: After the pressing stage, open the three-way pneumatic valve 14 to switch to the sludge return pneumatic valve 9 on the compressed air pipeline 16 and the backflush return pipeline 24, and close the filtrate discharge pneumatic valve 23; connect each pneumatic valve through the instrument air tank 21 to control the opening and closing of the pneumatic valves; the filter plate is provided with a feed channel, and the compressed air from the backflush air tank 20 enters the feed channel of the double diaphragm filter press 12 through the backflush pipeline 13, discharging the mud-water mixture in the feed channel to the wastewater treatment system through the backflush return pipeline 24, completing the first purging stage; connect the backflush air tank 20 through the air compressor 19 to compress air; after the first purging stage is completed, close the sludge return pneumatic valve 9. The process then enters the second stage of purging. Compressed air continues to enter the filter chamber of the double diaphragm filter press 12 through the back-flushing air tank 20. Since the sludge return pneumatic valve 9 and the filtrate discharge pneumatic valve 23 are both closed, the filter chamber is in a sealed environment. The pressure in the filter chamber rises continuously as the compressed air enters. When the pressure reaches a certain value, the compressed air will be discharged through the filter plates of the double diaphragm filter press 12, simultaneously carrying away the moisture in the filter chamber and further reducing the moisture content of the sludge cake. When this process continues for a certain period of time, the three-way pneumatic valve 14 is closed while the filtrate discharge pneumatic valve 23 is opened, and the press water return pneumatic valve 28 is opened to unload the pressure in the filter chamber.

[0038] 5. Vacuum hot air drying stage: Open the three-way pneumatic valve 14 to switch to the vacuum pipeline 15 and close the filtrate discharge pneumatic valve 23. Simultaneously, the hot air inlet valve 11 and the hot air outlet pneumatic valve 26 of the filter press are opened, and the hot air unit 3 is turned on to generate hot air with a certain pressure and temperature. The filter plates are also equipped with filtrate drain holes, which are arranged around the feed channel. Hot air is delivered to the four filtrate drain holes of the double diaphragm filter press 12 through the hot air outlet pipe 27. The hot air enters the double diaphragm filter press 12 through the four filtrate drain holes. The filter plates are also equipped with filter cloth covering the inner wall of the filter chamber. The hot air enters the filter chamber through the drain hole, passes through the filter cloth, and exchanges heat with the filter cake. During this process, heat is transferred to the filter cake. Because the hot air is constantly flowing, it carries away the moisture from the filter cake. At the same time, because the air pressure of the hot air unit 3 is not high, and the filter cloth, filter cake, and filtrate drain holes in the filter chamber increase the flow rate and conduction area of ​​the hot air, a vacuum pump 18 is installed. The vacuum pump 18 generates negative pressure, greatly improving and assisting the flow rate and flow area of ​​hot air in the filter press chamber. The vacuum pump 18 connects to the backflush pipe 13 via the vacuum pipe 15, which is connected to the central inlet hole (feed channel) of the filter press chamber. By generating negative pressure at the central inlet hole, the filter cake in each chamber can enter the hot air through the four surrounding filtrate drain holes. The hot air makes full contact with the filter cake, is then drawn into the central inlet hole by the negative pressure, and finally enters the negative pressure tank 17 for condensation and is discharged by the vacuum pump 18. By adjusting the temperature and time of the incoming hot air, the moisture in the filter cake in the filter press chamber can be removed and dried, further reducing the moisture content of the filter cake. Simultaneously, because the moisture in the filter press chamber is removed during this process, it is in a dry and clean state, equivalent to cleaning the filter cloth and filter plates, which can significantly reduce the filter cloth attenuation rate and extend the filter cloth life. After vacuum hot air drying is completed, the hot air unit 3 and vacuum pump 18 are turned off, the three-way pneumatic valve 14 is closed, and the filtrate discharge pneumatic valve 23 is opened. At the same time, close the hot air inlet valve 11 of the filter press and the pneumatic valve 26 of the hot air unit outlet, and proceed to the sludge unloading operation.

[0039] 6. Sludge unloading stage: The PLC control module 5 controls the double diaphragm filter press 12 to open, pull the plates, and unload sludge according to the program until the unloading is completed.

[0040] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A sludge dewatering filter press, characterized in that, The system includes a homogenization tank, a pressing water tank, a backflushing air storage tank, a vacuum pump, a hot air unit, and a double diaphragm filter press. The homogenization tank is connected to the double diaphragm filter press via a filter press feed pump. The pressing water tank is connected to the double diaphragm filter press via a pressing pipeline. The double diaphragm filter press is connected to a backflushing pipeline, which is equipped with a three-way pneumatic valve. A compressed air pipeline connects the backflushing air storage tank and the three-way pneumatic valve. The vacuum pump is connected to the double diaphragm filter press via a vacuum pipeline. The hot air unit is connected to the double diaphragm filter press via a hot air outlet pipeline.

2. The sludge dewatering device as described in claim 1, characterized in that, The double diaphragm filter press is connected to a filtrate discharge pipeline, and the filtrate discharge pipeline is equipped with a filtrate discharge pneumatic valve.

3. The sludge dewatering device as described in claim 2, characterized in that, The homogenization tank is provided with a sludge inlet pneumatic valve between it and the filter press feed pump. The double diaphragm filter press is provided with a filter press sludge inlet pipeline between it and the filter press feed pump. The filter press sludge inlet pipeline is provided with a filter press sludge inlet pneumatic valve.

4. The sludge dewatering device as described in claim 3, characterized in that, The filter press inlet pipe is also connected to a backflushing return pipe, and the backflushing return pipe is equipped with a sludge return pneumatic valve.

5. The sludge dewatering device as described in claim 4, characterized in that, The pressing pipeline is equipped with a pressing pump and a pressing water inlet pneumatic valve in sequence.

6. The sludge dewatering device as described in claim 5, characterized in that, The hot air outlet duct is equipped with a hot air unit outlet pneumatic valve and a filter press hot air inlet valve in sequence, and a negative pressure tank is also provided between the vacuum pump and the vacuum duct.

7. The sludge dewatering device as described in claim 6, characterized in that, It also includes a PLC control module, which is connected to the dual diaphragm filter press.

8. The sludge dewatering device as described in claim 7, characterized in that, The pressing water tank is also connected to a pressing water return pipeline, and a pressing water return pneumatic valve is installed on the pressing water return pipeline. The pressing water return pneumatic valve is located between the pressing water tank and the pressing water inlet pneumatic valve.

9. The sludge dewatering device as described in claim 8, characterized in that, It also includes an air compressor, which is connected to a backflush air tank.

10. The sludge dewatering device as described in claim 9, characterized in that, It also includes an instrument air tank, which is connected between the compressed air pipeline and the backflush air tank.

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