A screening device and screening method for anaerobic ammonium oxidation granular sludge

Abstract

The present invention discloses a screening device and a screening method for anaerobic ammonium oxidation granular sludge. The anaerobic ammonium oxidation granular sludge screening device comprises: a sludge screening device body, a gas delivery device, and a gas delivery control end. The present invention uses the gas delivery control end to set the air flow rate to adjust the cyclone centrifugal force, and sets filters with different apertures, so as to achieve the screening of anaerobic ammonium oxidation granular sludge of different particle sizes; the cyclone centrifugal force is used to screen the granular sludge, and the shear force of the water flow can be used to compact the already formed granular sludge, which is conducive to the growth and formation of large granular sludge; and compared with the centrifugal force screening method formed by the agitator, the damage to the granular sludge caused by excessive shear force is reduced; this device has a reasonable structural design, is easy to install and operate, has low operating and maintenance costs, and has relatively low energy consumption. It can achieve the screening of granular sludge of different particle sizes, and provide more convenient conditions for the rapid enrichment and cultivation of anaerobic ammonium oxidation granular sludge.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and more specifically, relates to a screening device and a screening method for anaerobic ammonium oxidation granular sludge. Background Art

[0002] Anaerobic ammonium oxidation is a new type of biological denitrification process that does not require aeration. It can oxidize ammonia into nitrogen gas under anaerobic conditions using nitrite as an electron acceptor. The amount of residual sludge is small, which helps to reduce the addition of carbon sources and energy waste during the denitrification process. With the rapid development and application of the anaerobic ammonium oxidation process, the anaerobic ammonium oxidation granular sludge cultivation process has also been further studied and promoted due to its good sedimentation performance, strong resistance to shock loads, high removal load, efficient retention of microorganisms, and easy transportation of strains. However, in the sludge cultivation process of the current process, granular sludge of different particle sizes in the anaerobic ammonium oxidation granular sludge reactor is completely mixed, and it is impossible to screen and wash small granular sludge, making the engineering application of large granular anaerobic ammonium oxidation sludge a problem that needs to be solved urgently. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings existing in the existing anaerobic ammonium oxidation granular sludge cultivation process, and to provide an anaerobic ammonium oxidation granular sludge device and method, which has the advantages of reasonable structural design, convenient installation and operation, low operation and maintenance costs, and relatively low energy consumption. It can realize the screening of anaerobic ammonium oxidation granular sludge of different particle sizes, and provide more convenient conditions for the rapid enrichment and cultivation of anaerobic ammonium oxidation granular sludge and the promotion of anaerobic ammonium oxidation granular sludge technology.

[0004] In order to achieve the above-mentioned object, the first aspect of the present invention provides a screening device for anaerobic ammonium oxidation granular sludge, the anaerobic ammonium oxidation granular sludge screening device comprising:

[0005] The main body of the sludge screening device, the gas delivery device, and the gas delivery control terminal;

[0006] The main body of the sludge screening device includes a main body area, a sloped mud bucket area and a mud storage channel area arranged in sequence from top to bottom, and the main body area, the sloped mud bucket area and the mud storage channel area are interconnected;

[0007] The main body of the sludge screening device is provided with a first-stage filter screen, a second-stage filter screen, and a third-stage filter screen from the front end to the rear end, respectively, and the main body of the sludge screening device is divided into four relatively independent areas, namely the first area, the second area, the third area, and the fourth area; wherein the aperture of the first-stage filter screen is greater than the aperture of the second-stage filter screen and greater than the aperture of the third-stage filter screen;

[0008] A baffle is fixed at the front end of the main body of the sludge screening device;

[0009] The gas delivery device comprises a plurality of air inlet heads and an air inlet pipe, wherein the plurality of air inlet heads are arranged on the inner side wall of the main body of the sludge screening device, the air inlet heads are connected to the air inlet pipe and lead out of the main body of the sludge screening device, the air inlet pipe is connected to the gas delivery control end through an electric valve, the gas delivery control end transmits an electrical signal to the electric valve, controls the gas delivery device to directional deliver air into the main body of the sludge screening device, and controls the delivery amount of air;

[0010] A water inlet pipe is provided at the side wall of the main body area near the front end, and the water inlet pipe is used to directional transport the mud-water mixture containing anaerobic ammonium oxidation granular sludge to the main body area; the water inlet pipe makes the angle between the water flow direction of the inlet water and the horizontal direction be 55°-65°;

[0011] The mud storage channel area is connected to a plurality of mud outlet pipes, wherein the first area, the second area, the third area and the fourth area are each provided with at least one mud outlet pipe;

[0012] A water outlet pipe is arranged at the end of the main body area.

[0013] Preferably, a fixed slope device is provided at the bottom of the sludge storage channel area so that the main body of the sludge screening device is inclined from the front end to the rear end.

[0014] Further preferably, the slope of the fixed slope device is 0.4-0.8.

[0015] Preferably, in the mud-water mixture containing anaerobic ammonium oxidation granular sludge, the particle size of the anaerobic ammonium oxidation granular sludge is 0-6 mm, excluding 0.

[0016] Preferably,

[0017] The aperture of the first-stage filter is 2.5-3.5mm;

[0018] The aperture of the second-stage filter is 0.8-1.2mm;

[0019] The aperture of the third-stage filter is 0.2-0.6mm.

[0020] Preferably, the ratio of the length, width and height of the sludge screening device body is 4-6:1:1-1.5.

[0021] Preferably, the slope of the sloped mud bucket area is 0.1-0.5.

[0022] Preferably, the air inlet of the air inlet pipe is arranged at 1 / 3 to 1 / 2 of the effective water depth of the sludge screening device body.

[0023] The second aspect of the present invention provides a method for screening anaerobic ammonium oxidation granular sludge, the screening method using the above-mentioned screening device, the screening method comprising:

[0024] 1) The sludge-water mixture containing the anaerobic ammonium oxidation granular sludge is directed into the main body of the sludge screening device through the water inlet pipe, and the gas delivery control end controls the flow rate of the gas delivery device to deliver air to the main body of the sludge screening device in a directional manner;

[0025] The flow direction of the mud-water mixture is the same as the air intake direction of the air, the water outlet direction is perpendicular to the flow direction of the mud-water mixture, and the horizontal height of the air inlet connected to the air intake head is higher than the horizontal height of the water inlet connected to the water inlet pipe;

[0026] 2) With the continuous input of mud-water mixture, the solid-liquid mixture in the screening device forms a vortex under the action of the inlet water flow and the intake air flow, and the large particles of sludge in the solid-liquid mixture are thrown to the side wall of the sludge screening device body or intercepted by the first-stage filter screen, the second-stage filter screen or the third-stage filter screen, and then drawn into the mud storage channel area at the bottom of the slope mud bucket area along the slope of the slope mud bucket area, and discharged from the mud outlet pipe;

[0027] 3) The mud-water mixture that passes through the first-stage filter, the second-stage filter and the third-stage filter is discharged from the outlet.

[0028] Preferably,

[0029] The ratio of the flow rate of the air delivered by the gas delivery device to the water flow rate of the mud-water mixture is 0.1-0.2.

[0030] Beneficial effects of the present invention:

[0031] The air flow rate is set by the gas delivery control end to adjust the cyclone centrifugal force, and filters with different apertures are set to achieve the screening of anaerobic ammonium oxidation granular sludge with different particle sizes;

[0032] The sludge granules are screened by swirl centrifugal force, which can utilize the shear force of water flow to compact the sludge granules, which is conducive to the growth and formation of large sludge granules; and compared with the centrifugal force screening method formed by the agitator, it reduces the damage of excessive shear force to the sludge granules;

[0033] This device has the advantages of reasonable structural design, easy installation and operation, low operation and maintenance costs, and relatively low energy consumption. It can screen granular sludge of different particle sizes and provide more convenient conditions for the rapid enrichment and cultivation of anaerobic ammonia oxidation granular sludge.

[0034] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0036] Figure 1 A schematic structural diagram of a screening device for anaerobic ammonium oxidation granular sludge according to an embodiment of the present invention is shown.

[0037] Figure 2 A schematic diagram showing a cross section of a first-stage filter screen of an anaerobic ammonium oxidation granular sludge screening device according to an embodiment of the present invention is shown.

[0038] Description of reference numerals:

[0039] 1-main area, 2-slope mud bucket area, 3-mud storage channel area, 4-water inlet pipe, 5-air inlet head, 6-mud outlet pipe, 7-baffle, 8-air inlet pipe, 9-electric valve, 10-water outlet pipe, 11-gas delivery control end. DETAILED DESCRIPTION

[0040] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0041] A first aspect of the present invention provides a screening device for anaerobic ammonium oxidation granular sludge, the anaerobic ammonium oxidation granular sludge screening device comprising:

[0042] The main body of the sludge screening device, the gas delivery device, and the gas delivery control terminal;

[0043] The main body of the sludge screening device includes a main body area, a sloped mud bucket area and a mud storage channel area arranged in sequence from top to bottom, and the main body area, the sloped mud bucket area and the mud storage channel area are interconnected;

[0044] The main body of the sludge screening device is provided with a first-stage filter screen, a second-stage filter screen, and a third-stage filter screen from the front end to the rear end, respectively, and the main body of the sludge screening device is divided into four relatively independent areas, namely the first area, the second area, the third area, and the fourth area; wherein the aperture of the first-stage filter screen is greater than the aperture of the second-stage filter screen and greater than the aperture of the third-stage filter screen;

[0045] A baffle is fixed at the front end of the main body of the sludge screening device;

[0046] The gas delivery device comprises a plurality of air inlet heads and an air inlet pipe, wherein the plurality of air inlet heads are arranged on the inner side wall of the main body of the sludge screening device, the air inlet heads are connected to the air inlet pipe and lead out of the main body of the sludge screening device, the air inlet pipe is connected to the gas delivery control end through an electric valve, the gas delivery control end transmits an electrical signal to the electric valve, controls the gas delivery device to directional deliver air into the main body of the sludge screening device, and controls the delivery amount of air;

[0047] A water inlet pipe is provided at the side wall of the main body area near the front end, and the water inlet pipe is used to directional transport the mud-water mixture containing anaerobic ammonium oxidation granular sludge to the main body area; the water inlet pipe makes the angle between the water flow direction of the inlet water and the horizontal direction be 55°-65°;

[0048] The mud storage channel area is connected to a plurality of mud outlet pipes, wherein the first area, the second area, the third area and the fourth area are each provided with at least one mud outlet pipe;

[0049] A water outlet pipe is arranged at the end of the main body area.

[0050] In the present invention, the main body of the sludge screening device is respectively provided with a first-stage filter screen, a second-stage filter screen, and a third-stage filter screen from the front end to the rear end, and the main body of the sludge screening device is divided into four relatively independent areas, namely the first area, the second area, the third area and the fourth area. The first area, the second area, the third area and the fourth area are each provided with at least one mud outlet pipe, which can enhance the screening of sludge particles of different particle sizes, and the mud outlet pipe can divert anaerobic ammonia oxidation granular sludge of different particle sizes.

[0051] Preferably, a fixed slope device is provided at the bottom of the sludge storage channel area so that the main body of the sludge screening device is inclined from the front end to the rear end.

[0052] Further preferably, the slope of the fixed slope device is 0.4-0.8.

[0053] Preferably, in the mud-water mixture containing anaerobic ammonium oxidation granular sludge, the particle size of the anaerobic ammonium oxidation granular sludge is 0-6 mm, excluding 0.

[0054] Preferably,

[0055] The aperture of the first filter is 2.5-3.5 mm, such as 3 mm;

[0056] The aperture of the second filter is 0.8-1.2mm, such as 1mm;

[0057] The aperture of the third-stage filter is 0.2-0.6 mm, such as 0.5 mm.

[0058] Preferably, the ratio of the length, width and height of the sludge screening device body is 4-6:1:1-1.5.

[0059] Preferably, the slope of the sloped mud bucket area is 0.1-0.5.

[0060] Preferably, the air inlet of the air inlet pipe is arranged at 1 / 3 to 1 / 2 of the effective water depth of the sludge screening device body.

[0061] The second aspect of the present invention provides a method for screening anaerobic ammonium oxidation granular sludge, the screening method using the above-mentioned screening device, the screening method comprising:

[0062] 1) The sludge-water mixture containing the anaerobic ammonium oxidation granular sludge is directed into the main body of the sludge screening device through the water inlet pipe, and the gas delivery control end controls the flow rate of the gas delivery device to deliver air to the main body of the sludge screening device in a directional manner;

[0063] The flow direction of the mud-water mixture is the same as the air intake direction of the air, the water outlet direction is perpendicular to the flow direction of the mud-water mixture, and the horizontal height of the air inlet connected to the air intake head is higher than the horizontal height of the water inlet connected to the water inlet pipe;

[0064] 2) With the continuous input of mud-water mixture, the solid-liquid mixture in the screening device forms a vortex under the action of the inlet water flow and the intake air flow, and the large particles of sludge in the solid-liquid mixture are thrown to the side wall of the sludge screening device body or intercepted by the first-stage filter screen, the second-stage filter screen or the third-stage filter screen, and then drawn into the mud storage channel area at the bottom of the slope mud bucket area along the slope of the slope mud bucket area, and discharged from the mud outlet pipe;

[0065] 3) The mud-water mixture that passes through the first-stage filter, the second-stage filter and the third-stage filter is discharged from the outlet.

[0066] In the present invention, the gas conveying device conveys air in a directional manner into the screening device, and the mud-water mixture directed into the screening device from the water inlet pipe generates a vortex in the screening device. Under the centrifugal force of the vortex, the large particles of sludge in the solid-liquid mixture are thrown to the side wall of the main body of the sludge screening device or are intercepted by the first-stage filter screen, the second-stage filter screen or the third-stage filter screen, and then are drawn into the mud storage channel area at the bottom of the slope mud bucket area along the slope of the slope mud bucket area and discharged from the mud outlet pipe; the mud-water mixture passes through the first-stage filter screen, the second-stage filter screen and the third-stage filter screen in the running direction in turn and is discharged from the water outlet.

[0067] In the present invention, the water flow direction of the mud-water mixture is the same as the air intake direction, which can enhance the effect of shear force; the water outlet direction is perpendicular to the water flow direction of the mud-water mixture, which can reduce the water outlet disturbance and the loss of relatively large granular sludge, and screen out relatively small granular sludge.

[0068] In the present invention, the sludge particles of different particle sizes are screened by the cyclonic centrifugal force, and the formed granular sludge can be compacted by the shear force of the water flow, which is beneficial to the growth and formation of the granular sludge.

[0069] In the present invention, the magnitude of the swirl centrifugal force generated in the device can be indirectly controlled by controlling the air intake of the gas delivery device. The ratio of the air flow rate delivered by the gas delivery device to the mud-water mixture flow rate is 0.1-0.2. For example, if the air flow rate is 1.5m per square meter of pool surface area, 3 / h, pool surface area 10m 2 The mud-water mixture flow rate can be set to 150m 3 / h.

[0070] Example

[0071] This embodiment provides a screening device and a screening method for anaerobic ammonium oxidation granular sludge. Figure 1 A schematic structural diagram of a screening device for anaerobic ammonium oxidation granular sludge according to an embodiment of the present invention is shown. Figure 2 A schematic diagram showing a cross section of a first-stage filter screen of an anaerobic ammonium oxidation granular sludge screening device according to an embodiment of the present invention is shown.

[0072] like Figure 1 , Figure 2 As shown, the anaerobic ammonium oxidation granular sludge screening device includes:

[0073] The sludge screening device body, the gas delivery device, and the gas delivery control terminal 11;

[0074] The main body of the sludge screening device includes a main body area 1, a slope mud bucket area 2 and a mud storage channel area 3 arranged in sequence from top to bottom, and the main body area 1, the slope mud bucket area 2 and the mud storage channel area 3 are connected to each other;

[0075] The main body of the sludge screening device is provided with a first-stage filter screen, a second-stage filter screen, and a third-stage filter screen from the front end to the rear end, respectively, and the main body of the sludge screening device is divided into four relatively independent areas, namely the first area, the second area, the third area, and the fourth area; wherein the aperture of the first-stage filter screen is greater than the aperture of the second-stage filter screen and greater than the aperture of the third-stage filter screen;

[0076] A baffle 7 is fixed to the front end of the main body of the sludge screening device;

[0077] The gas delivery device includes four air inlet heads 5 and an air inlet pipe 8. The four air inlet heads 5 are respectively arranged on the inner side walls of the main body of the sludge screening device located in the first area, the second area, the third area and the fourth area. The air inlet heads 5 are connected to the air inlet pipe 8 and lead out of the main body of the sludge screening device. The air inlet pipe 8 is connected to the gas delivery control end 11 through the electric valve 9. The gas delivery control end 11 transmits an electrical signal to the electric valve 9 to control the gas delivery device to directional deliver air into the main body of the sludge screening device and control the delivery amount of the air.

[0078] A water inlet pipe 4 is provided at the side wall of the main body area 1 near the front end, and the water inlet pipe 4 is used to directional transport the mud-water mixture containing anaerobic ammonium oxidation granular sludge to the main body area 1; the water inlet pipe 4 makes the angle between the water flow direction of the inlet water and the horizontal direction be 60°;

[0079] The mud storage channel area 3 is connected to a plurality of mud outlet pipes 6, wherein each of the first area, the second area, the third area and the fourth area is provided with a mud outlet pipe 6;

[0080] A water outlet pipe 10 is provided at the end of the main body area 1 .

[0081] A fixed slope device (not shown) is provided at the bottom of the sludge storage channel area 3, so that the main body of the sludge screening device is inclined from the front end to the rear end, and the slope of the fixed slope device is 0.4-0.8.

[0082] In the mud-water mixture containing anaerobic ammonium oxidation granular sludge, the particle size of the anaerobic ammonium oxidation granular sludge is 0-6mm, excluding 0.

[0083] In this embodiment, the pore size of the first-stage filter is 3 mm, the pore size of the second-stage filter is 1 mm, and the pore size of the third-stage filter is 0.5 mm.

[0084] The ratio of the length, width and height of the sludge screening device body is 5:1:1.2.

[0085] The slope of the slope bucket area 2 is 0.3.

[0086] During actual operation, the air inlet of the air inlet pipe 8 is arranged at 1 / 3 to 1 / 2 of the effective water depth of the main body of the sludge screening device.

[0087] Screening methods include:

[0088] 1) The mud-water mixture containing the anaerobic ammonium oxidation granular sludge is directed into the sludge screening device body through the water inlet pipe 4, and the gas delivery control end 11 controls the flow rate of the gas delivery device intake to deliver air to the sludge screening device body in a directional manner;

[0089] The flow direction of the mud-water mixture is the same as the air intake direction of the air, the water outlet direction is perpendicular to the flow direction of the mud-water mixture, and the horizontal height of the air inlet connected to the air intake head 5 is higher than the horizontal height of the water inlet connected to the water inlet pipe 4;

[0090] 2) With the continuous input of the mud-water mixture, the solid-liquid mixture in the screening device forms a vortex under the action of the inlet water flow and the intake air flow, and the large particles of sludge in the solid-liquid mixture are thrown to the side wall of the sludge screening device body or intercepted by the first-stage filter screen, the second-stage filter screen or the third-stage filter screen, and then drawn into the sludge storage channel area 3 at the bottom of the slope mud bucket area 2 along the slope of the slope mud bucket area 2, and discharged from the mud outlet pipe 6;

[0091] 3) The mud-water mixture that passes through the first-stage filter, the second-stage filter and the third-stage filter is discharged from the outlet.

[0092] The air flow rate of the gas delivery device is 1-15m per square meter of pool surface area. 3 / h; pool surface area 10m 2 The water flow rate of the mud-water mixture is 50-1000m 3 / h, the ratio of the flow rate of air delivered by the gas delivery device to the water flow rate of the mud-water mixture inlet is 0.15.

[0093] After the above screening, granular sludge of different particle size grades (particle size grades are ≤0.5mm, 0.5-1mm excluding 0.5mm, 1-3mm excluding 1mm, and >3mm) can be obtained in the early, middle and late stages of the granular sludge process operation and cultivation, which can be used for the reflux cultivation and output of granular sludge, which is beneficial to the precise cultivation and output of anaerobic ammonia oxidation granular sludge.

[0094] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A screening device for anaerobic ammonium oxidation granular sludge, characterized in that: The anaerobic ammonium oxidation granular sludge screening device comprises: A sludge screening device body, a gas delivery device, and a gas delivery control terminal (11); The main body of the sludge screening device comprises a main body area (1), a sloped mud bucket area (2) and a mud storage channel area (3) which are arranged in sequence from top to bottom, and the main body area (1), the sloped mud bucket area (2) and the mud storage channel area (3) are interconnected; The main body of the sludge screening device is provided with a first-stage filter screen, a second-stage filter screen, and a third-stage filter screen from the front end to the rear end, respectively, and the main body of the sludge screening device is divided into four relatively independent areas, namely the first area, the second area, the third area, and the fourth area; wherein the aperture of the first-stage filter screen is greater than the aperture of the second-stage filter screen and greater than the aperture of the third-stage filter screen; The aperture of the first-stage filter is 2.5-3.5mm; The aperture of the second-stage filter is 0.8-1.2mm; The aperture of the third-stage filter is 0.2-0.6mm; A baffle (7) is fixed to the front end of the main body of the sludge screening device; The gas delivery device comprises a plurality of air inlet heads (5) and an air inlet pipe (8), wherein the plurality of air inlet heads (5) are arranged on the inner side wall of the main body of the sludge screening device, the air inlet heads (5) are connected to the air inlet pipe (8) and lead out of the main body of the sludge screening device, the air inlet pipe (8) is connected to the gas delivery control end (11) via an electric valve (9), and the gas delivery control end (11) transmits an electrical signal to the electric valve (9) to control the gas delivery device to directional deliver air into the main body of the sludge screening device and to control the delivery amount of air; A water inlet pipe (4) is provided at the side wall of the main body region (1) near the front end, and the water inlet pipe (4) is used to directional transport the mud-water mixture containing anaerobic ammonium oxidation granular sludge to the main body region (1); the water inlet pipe (4) makes the angle between the flow direction of the inlet water and the horizontal direction be 55°-65°; The mud storage channel area (3) is connected to a plurality of mud outlet pipes (6), wherein each of the first area, the second area, the third area and the fourth area is provided with at least one mud outlet pipe (6); A water outlet pipe (10) is provided at the end of the main body area (1).

2. The screening device for anaerobic ammonium oxidation granular sludge according to claim 1, wherein: A fixed slope device is provided at the bottom of the sludge storage channel area (3), so that the main body of the sludge screening device is inclined from the front end to the rear end.

3. The screening device for anaerobic ammonium oxidation granular sludge according to claim 2, wherein: The slope of the fixed slope device is 0.4-0.

8.

4. The screening device for anaerobic ammonium oxidation granular sludge according to claim 1, wherein: In the mud-water mixture containing anaerobic ammonium oxidation granular sludge, the particle size of the anaerobic ammonium oxidation granular sludge is 0-6 mm, excluding 0.

5. The screening device for anaerobic ammonium oxidation granular sludge according to claim 1, wherein: The ratio of the length, width and height of the sludge screening device body is 4-6:1:1-1.

5.

6. The screening device for anaerobic ammonium oxidation granular sludge according to claim 1, wherein: The slope of the sloped mud bucket area (2) is 0.1-0.

5.

7. The screening device for anaerobic ammonium oxidation granular sludge according to claim 1, wherein: The air inlet of the air inlet pipe (8) is arranged at 1 / 3 to 1 / 2 of the effective water depth of the main body of the sludge screening device.

8. A method for screening anaerobic ammonium oxidation granular sludge, characterized in that: The screening method uses the screening device according to any one of claims 1 to 7, and the screening method comprises: 1) The sludge-water mixture containing the anaerobic ammonium oxidation granular sludge is directed into the sludge screening device body through the water inlet pipe (4), and the gas delivery control end (11) controls the flow rate of the gas delivery device intake to deliver air to the sludge screening device body in a directed manner; The water flow direction of the mud-water mixture is the same as the air intake direction of the air, the water outlet direction is perpendicular to the water flow direction of the mud-water mixture, and the horizontal height of the air inlet connected to the air intake head (5) is higher than the horizontal height of the water inlet connected to the water inlet pipe (4); 2) With the continuous input of the mud-water mixture, the solid-liquid mixture in the screening device forms a vortex under the action of the inlet water flow and the inlet air flow, and the large particles of sludge in the solid-liquid mixture are thrown to the side wall of the sludge screening device body or intercepted by the first-stage filter screen, the second-stage filter screen or the third-stage filter screen, and then drawn along the slope of the slope mud bucket area (2) into the mud storage channel area (3) at the bottom of the slope mud bucket area (2) and discharged from the mud outlet pipe (6); 3) The mud-water mixture that passes through the first-stage filter, the second-stage filter and the third-stage filter is discharged from the outlet.

9. The screening method according to claim 8, wherein The ratio of the flow rate of the air delivered by the gas delivery device to the water flow rate of the mud-water mixture is 0.1-0.2.

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