Solid-liquid separation device and solid-liquid separation method using compressed air as power

Abstract

The present invention discloses a solid-liquid separation device and a solid-liquid separation method using compressed air as a power source, comprising a device body, a reflux trough, a solid-liquid separation zone, a sludge concentration zone, a clean water trough, an inclined plate and an air lift pipe, one end of the inclined plate is connected to the air lift pipe, the other end of the inclined plate is inclined downward and forms a sludge port with the bottom of the device body, the air lift pipe is connected to a compressed air pipe, compressed air enters from the compressed air pipe to drive the air lift pipe to lift sewage to be solid-liquid separated to the upper end of the reflux trough, the sewage descends and refluxes along the upper end of the reflux trough, enters the solid-liquid separation zone through the opening at the lower end of the reflux trough along the inclined plate, the sewage undergoes solid-liquid separation in the solid-liquid separation zone, the clean water flows upward to the clean water trough, the concentrated sludge descends to the sludge concentration zone and is discharged from the device body through the sludge port. It has the characteristics of being simple, efficient, land-saving, and having good applicability, effectively solves the problem of solid-liquid separation in sewage treatment, and is suitable for popularization and application.

Description

Technical Field

[0001] The present invention relates to technologies in the fields of environmental protection, sewage treatment, water supply and purification, and in particular to a solid-liquid separation device and a solid-liquid separation method using compressed air as power. Background Art

[0002] At present, the main methods of solid-liquid separation in sewage treatment are sedimentation, filtration, flotation, etc. Among them, sedimentation is the most commonly used and economical solid-liquid separation method. Sedimentation is generally used for solid-liquid separation of suspended matter. It is designed according to the density and particle size of the suspended matter and generally requires a very large area and volume. For example, physicochemical dosing reaction + sedimentation requires a reaction tank + sedimentation tank; the secondary sedimentation tank of the activated sludge method requires a water distribution channel + sedimentation tank + sludge return, both of which require a large area and tank capacity.

[0003] Therefore, in the present invention, the applicant has carefully studied a solid-liquid separation device and a solid-liquid separation method using compressed air as power to solve the above problems. Summary of the invention

[0004] In view of this, the present invention aims to address the deficiencies in the prior art, and its main purpose is to provide a solid-liquid separation device and a solid-liquid separation method using compressed air as power, which does not require additional mechanical power reflux, occupies a small area, and has the characteristics of simplicity, high efficiency, and land saving, effectively solving the problem of solid-liquid separation in sewage treatment.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A solid-liquid separation device using compressed air as a power source comprises a device body; the device body is provided with a reflux tank, a solid-liquid separation zone, a sludge concentration zone below the solid-liquid separation zone, a clean water tank above the solid-liquid separation zone, an inclined plate and an air lift pipe,

[0007] One end of the inclined plate is connected to the air lift pipe and an opening is provided between the inclined plate and the reflux tank. The other end of the inclined plate is tilted downward and forms a sludge outlet with the bottom of the device body. The sludge concentration area is shaped like a bucket that gradually decreases downward by the action of the inclined plate. The air lift pipe is connected to a compressed air pipe.

[0008] Compressed air enters from the compressed air pipe to drive the air lift pipe to lift the sewage to be separated into solid and liquid to the upper end of the reflux tank. The sewage descends and refluxes along the upper end of the reflux tank, passes through the lower end of the reflux tank through the opening and enters the solid-liquid separation area along the inclined plate. The sewage is separated into solid and liquid in the solid-liquid separation area, the clean water flows upward to the clean water tank, and the concentrated sludge descends to the sludge concentration area and is discharged from the device body through the sludge port.

[0009] As a preferred solution: the area below the inclined plate serves as a water inlet area, and sewage in the water inlet area enters the air lift pipe through the opening at the lower end of the air lift pipe.

[0010] As a preferred solution: the clean water trough is hung on one side of the reflux trough to form a whole with the reflux trough; or, the clean water trough is hung on the inner wall of the device body to form a whole with the device body.

[0011] As a preferred solution: the cross-sectional shape of the device body is W-shaped; two inclined plates forming an inverted V shape are arranged at the bottom of the device body; corresponding to the side where each inclined plate is located, a solid-liquid separation zone and a sludge concentration zone are separately arranged; the lower ends of the reflux trough are respectively arranged corresponding to the upper ends of the two inclined plates to be respectively connected to the solid-liquid separation zones on both sides; and clean water troughs are respectively arranged above the solid-liquid separation zones on both sides.

[0012] As a preferred solution: a plurality of gas lift pipes are arranged to achieve multi-point water inlet.

[0013] As a preferred solution: the lower end of the inclined plate extends to below the bottom of the device body.

[0014] A solid-liquid separation method, which is based on the solid-liquid separation device and solid-liquid separation method using compressed air as power;

[0015] The sewage in the water inlet area that needs solid-liquid separation enters the air lift pipe and is lifted to the upper end of the reflux tank through the power provided by compressed air, descends and refluxes in the reflux tank, enters the solid-liquid separation area along the inclined plate at the lower end of the reflux tank for solid-liquid separation, and the clean water flows upward to the clean water tank, and the concentrated sludge descends to the sludge concentration area and is discharged from the device body through the sludge outlet; the sludge after being discharged from the device body flows back to the water inlet area, mixes with the sewage again, and enters the air lift pipe again.

[0016] Correspondingly, the present invention also provides a sedimentation system, comprising at least two connected solid-liquid separation devices using compressed air as power.

[0017] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that it mainly uses compressed air as power, combined with the design of functional parts such as air lift pipes, reflux tanks, solid-liquid separation areas, sludge concentration areas, inclined plates, and clean water tanks, to achieve reflux without additional mechanical power. The air flow rate for air lift is small and the lift is low, which saves energy compared with the general sedimentation tank sludge return system. Under the premise of saving energy, better solid-liquid separation effect is obtained, and the separation efficiency is high; at the same time, it has a simple structure, small footprint, and is easy to use, and can be directly placed in the treatment tank; therefore, it has the characteristics of simplicity, high efficiency, land saving, good applicability, etc., effectively solves the problem of solid-liquid separation in sewage treatment, and is suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a cross-sectional view of a first embodiment of a solid-liquid separation device of the present invention;

[0019] Figure 2 yes Figure 1 A top view of the solid-liquid separation device shown;

[0020] Figure 3 It is a cross-sectional view (half-side structural type) of the second embodiment of the solid-liquid separation device of the present invention.

[0021] Description of the accompanying drawings:

[0022] 1. Solid-liquid separation device

[0023] 2. Water inlet area

[0024] 3. Compressed air pipe

[0025] 4. Air lift pipe

[0026] 5. Reflux tank

[0027] 6. Clean water tank

[0028] 7. Inclined Plank

[0029] 8. Solid-liquid separation area

[0030] 9. Sludge bucket

[0031] 10. Sludge outlet

[0032] 11. Open your mouth DETAILED DESCRIPTION

[0033] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0034] Please refer to Figure 1The solid-liquid separation device using compressed air as power of the present application comprises a device body 1; the device body 1 is provided with a reflux trough 5, a solid-liquid separation zone 8, a sludge concentration zone 9 located below the solid-liquid separation zone 8, a clean water tank 6 located above the solid-liquid separation zone 8, an inclined plate 7 and an air lift pipe 4. The sludge concentration zone 9 is located above the inclined plate 7, which is arranged at the bottom of the device body 1. One end of the inclined plate 7 is connected to the air lift pipe 4 and an opening 11 is arranged between the inclined plate 7 and the reflux trough 5. The other end of the inclined plate 7 is arranged to be inclined downward and a sludge port 10 is formed between the inclined plate 7 and the device body 1. The sludge concentration zone 9 is in a bucket shape that gradually decreases downward by the action of the inclined plate 7. Among them, the reflux trough 5 is arranged in a horizontal isolation. In a preferred embodiment, the lower end of the inclined plate 7 extends to the bottom of the device body 1 and forms a sludge port 10 with the bottom of the device body 1, so that the sludge can be directly discharged from the device body 1. The lower end of the reflux trough 5 corresponds to the upper end of the inclined plate 7 and is connected to the solid-liquid separation zone 8. That is to say, the upper ends of the reflux trough 5 and the inclined plate 7 have openings 11 for the sewage to flow out of the reflux trough 5 to the solid-liquid separation area 8 .

[0035] Please continue to refer to Figure 1 , the air lift pipe 4 is connected to the compressed air pipe 3, and the compressed air enters from the compressed air pipe 3 to drive the air lift pipe 4 to lift the sewage to be separated into solid and liquid to the upper end of the reflux tank 5. That is, the driving power is provided by compressed air. Of course, the compressed air can come from any part of the system. In this embodiment, the solid-liquid separation device adopts an independent air supply circuit, and the size of the inlet flow rate can be controlled according to the inlet water quality, so as to obtain the best solid-liquid separation effect. The air flow rate of air lift is small and the lift is low, which saves energy consumption compared with the general sedimentation tank sludge return system. The sewage to be separated into solid and liquid is lifted to the upper end of the reflux tank 5 by the air lift pipe 4, and the sewage descends and flows back from the upper end of the reflux tank 5, and enters the solid-liquid separation area 8 along the inclined plate 7 through the lower end of the reflux tank 5. The sewage is separated into solid and liquid in the solid-liquid separation area 8, and the clean water flows upward to the clean water tank 6 (that is, M in the figure indicates the clean water flow direction), and the concentrated sludge descends to the sludge concentration area 9 and is discharged from the device body 1 through the sludge port 10 (that is, N in the figure indicates the sludge flow direction). For further information, please refer to Figure 2 , multiple air lift pipes 4 can be arranged to achieve multi-point water inlet. Compared with conventional large circular and rectangular sedimentation tanks, this device adopts multi-point water inlet and multi-point uniform water distribution, which can effectively reduce the problem of heterogeneous flow in large sedimentation tanks, thereby improving the solid-liquid separation efficiency.

[0036] Please continue to refer to Figure 1 The area below the inclined plate 7 is used as the water inlet area 2, and the sewage in the water inlet area 2 enters the air lift pipe 4 through the lower opening of the air lift pipe 4. In this way, the water inlet, water distribution and clean water can be centrally arranged, making the device easy to maintain. Of course, if the water inlet area comes from other areas, it is also possible.

[0037] Please continue to refer to Figure 1The clean water trough 6 can be located at any position above the solid-liquid separation zone 8. It can be set up separately, or the clean water trough 6 can be hung on one side of the reflux trough 5 to form a whole with the reflux trough 5; or, the clean water trough 6 can be hung on the inner wall of the device body 1 to form a whole with the device body 1.

[0038] Please refer to Figure 1 and Figure 3 , Figure 1 The cross-sectional shape of the device body 1 shown is W-shaped, and the cross-sectional shape is W-shaped, which is easy to place and transport; Figure 3 The device body 1 shown is a half-side structure. In actual production and application, both situations are possible, wherein: Figure 1 The bottom of the device body 1 shown is provided with two inclined plates 7 forming an inverted V shape; corresponding to the side where each inclined plate 7 is located, a solid-liquid separation area 8 and a sludge concentration area 9 are separately provided; the lower end of the reflux trough 5 is respectively provided corresponding to the upper end of the two inclined plates 7 to be connected to the solid-liquid separation areas 8 on both sides; and a clear water trough 6 is respectively provided above the solid-liquid separation areas 8 on both sides. In this way, the mud and water separation on both sides of the W shape are independent of each other and do not interfere with each other.

[0039] The present application also provides a sedimentation system, comprising at least two connected solid-liquid separation devices using compressed air as power. The structure of the device body 1 is relatively simple, and the external shape is relatively regular. More than two solid-liquid separation devices can be seamlessly connected together to form a large sedimentation system, which can be used in large solid-liquid separation occasions.

[0040] The present application also provides a solid-liquid separation method using a solid-liquid separation device using compressed air as a power source. Compressed air is input from a compressed air pipe 3 to provide power, so that the sewage to be separated into solid and liquid in the water inlet area 2 enters the air lift pipe 4 and is lifted to the upper end of the reflux tank 5, then descends and refluxes through the reflux tank 5, enters the inclined plate 7 from the lower end opening of the reflux tank 5, and enters the solid-liquid separation area 8 along the inclined plate 7, performs solid-liquid separation in the solid-liquid separation area 8, and the clean water flows upward to the clean water tank 6, and the concentrated sludge descends to the sludge concentration area 9 and is discharged from the device body 1 through the sludge port 10. In a preferred embodiment, the sludge after being discharged from the device body 1 can also flow back to the water inlet area 2, mix with the sewage again, and enter the air lift pipe 4 again.

[0041] The specific application scenarios of the solid-liquid separation device using compressed air as power are described in detail below in conjunction with the present application. However, the present invention will not be limited to these specific application scenarios shown in this article, but will conform to the widest scope consistent with the principles and novel features disclosed in this article.

[0042] First, the solid-liquid separation device is used in the sewage physicochemical treatment reaction sedimentation tank, that is, the solid-liquid separation device is placed in the sedimentation tank, and the compressed air supply device is connected, the compressed air supply device is started, and the compressed air enters the air lift pipe 4 from the compressed air pipe 3, sucks the mixture of the agent and the sewage into the air lift pipe 4 and transports it to the upper end of the reflux tank 5, and then flows downward along the reflux tank 5 and flows to the inclined plate 7 through the opening 11, and flows to the solid-liquid separation area 8 through the action of the inclined plate 7, and performs rapid solid-liquid separation in the solid-liquid separation area 8, the clean water flows upward to the clean water tank 6, the sludge descends to the sludge concentration area 9, and is discharged from the device body 1 through the sludge port 10; the sludge contains a large amount of unreacted agents, which can be refluxed to the water inlet area 2 and mixed with the sewage again, which can save the addition of agents and can also produce a hydraulic clarification effect, strengthen the contact and adsorption between solid particles in the water, form a good flocculation, accelerate the sedimentation rate and make the water clear; and so on.

[0043] Secondly, the solid-liquid separation device is used in the sewage biochemical reaction tank, that is, the solid-liquid separation device is placed in the biochemical tank, and the compressed air supply device is connected, and the compressed air supply device is started. The compressed air enters the air lift pipe 4 from the compressed air pipe 3, and the activated sludge and sewage are sucked into the air lift pipe 4 and transported to the upper end of the reflux tank 5, and then flows downward along the reflux tank 5 and flows to the inclined plate 7 through the opening 11, and flows to the solid-liquid separation area 8 through the action of the inclined plate 7, and the solid-liquid separation is carried out quickly in the solid-liquid separation area 8, and the clean water flows upward to the clean water tank 6, and the sludge descends to the sludge concentration area 9, and is discharged from the device body 1 through the sludge port 10; the sludge flows back to the water inlet area 2 and mixes with the sewage again; and the cycle is repeated. The sludge can be returned without power, saving power consumption, and at the same time, there is no need to set up a special sedimentation tank, saving land.

[0044] The above application scenarios are only examples, and the actual application is not limited to the above application scenarios. The solid-liquid separation device can also be used in other scenarios requiring solid-liquid separation.

[0045] The design focus of the present invention is that it mainly uses compressed air as power, combined with the design of functional parts such as air lift pipe, reflux tank, solid-liquid separation zone, sludge concentration zone, inclined plate, clean water tank, etc., to achieve reflux without additional mechanical power. The air flow rate for air lift is small and the lift is low, which saves energy compared with the general sedimentation tank sludge return system. Under the premise of saving energy, better solid-liquid separation effect is obtained, and the separation efficiency is high; at the same time, it has a simple structure, small footprint, easy application, and can be directly placed in the treatment tank; therefore, it has the characteristics of simplicity, high efficiency, land saving, good applicability, etc., effectively solves the problem of solid-liquid separation in sewage treatment, and is suitable for promotion and application.

[0046] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A solid-liquid separation device using compressed air as power, characterized in that: The device comprises a device body (1), wherein the device body (1) is provided with a reflux tank (5), a solid-liquid separation zone (8), a sludge concentration zone (9) located below the solid-liquid separation zone (8), a clean water tank (6) located above the solid-liquid separation zone (8), an inclined plate (7) and an air lift pipe (4), The cross-sectional shape of the device body (1) is W-shaped; the bottom of the device body (1) is provided with two inclined plates (7) forming an inverted V shape; corresponding to the side where each inclined plate (7) is located, the solid-liquid separation zone (8) and the sludge concentration zone (9) are separately provided; the lower ends of the reflux trough (5) are respectively provided corresponding to the upper ends of the two inclined plates (7) to be connected to the solid-liquid separation zones (8) on both sides; and the clean water troughs (6) are respectively provided above the solid-liquid separation zones (8) on both sides. The area below the inclined plate (7) serves as the water inlet area (2). Sewage from the water inlet area (2) enters the air lift pipe (4) through the lower opening of the air lift pipe (4). One end of the inclined plate (7) is connected to the air lift pipe (4) and an opening (11) is provided between the inclined plate (7) and the reflux tank (5). The other end of the inclined plate (7) is inclined downward and forms a sludge opening (10) with the bottom of the device body (1). The sludge concentration area (9) is formed into a bucket shape that gradually decreases downward by the action of the inclined plate (7). The air lift pipe (4) is connected to a compressed air pipe (3). Compressed air enters from the compressed air pipe (3) to drive the air lift pipe (4) to lift the sewage to be separated into solid and liquid to the upper end of the reflux groove (5), and the sewage descends along the upper end of the reflux groove (5) and refluxes, and enters the solid-liquid separation zone (8) along the inclined plate (7) through the lower end of the reflux groove (5) through the opening (11), and the sewage undergoes solid-liquid separation in the solid-liquid separation zone (8), clean water flows upward to the clean water groove (6), and concentrated sludge descends to the sludge concentration zone (9) and is discharged from the device body (1) through the sludge outlet (10).

2. The solid-liquid separation device using compressed air as power according to claim 1, characterized in that: The clean water trough (6) is hung on one side of the reflux trough (5) to form a whole with the reflux trough (5).

3. The solid-liquid separation device using compressed air as power according to claim 1, characterized in that: The clean water tank (6) is hung on the inner wall of the device body (1) to form a whole with the device body (1).

4. The solid-liquid separation device using compressed air as power according to claim 1, characterized in that: A plurality of the gas lift pipes (4) are arranged to achieve multi-point water inlet.

5. The solid-liquid separation device using compressed air as power according to claim 1, characterized in that: The lower end of the inclined plate (7) extends to below the bottom of the device body (1).

6. A precipitation system, characterized in that: The invention comprises at least two connected solid-liquid separation devices using compressed air as a power as described in any one of claims 1 to 5.

7. A solid-liquid separation method, characterized in that: It is based on the solid-liquid separation device using compressed air as power according to any one of claims 1 to 5; Compressed air is input from the compressed air pipe (3) to provide power, so that the sewage to be separated into solid and liquid in the water inlet area (2) enters the air lift pipe (4) and is lifted to the upper end of the reflux tank (5), then descends and refluxes through the reflux tank (5), enters the solid-liquid separation area (8) along the inclined plate (7) from the lower end of the reflux tank (5) for solid-liquid separation, and the clean water flows upward to the clean water tank (6), and the concentrated sludge descends to the sludge concentration area (9) and is discharged from the device body (1) through the sludge outlet (10).

8. The solid-liquid separation method according to claim 7, characterized in that: The sludge discharged from the device body (1) flows back to the water inlet area (2), is mixed with the sewage again, and enters the air stripping pipe (4) again.

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