Sludge screening system for sewage plant

Abstract

The utility model relates to the technical field of environmental engineering, in particular to a sludge screening system for a sewage plant, which comprises a screening mechanism and is characterized in that through the arrangement of the screening mechanism, a cyclone separator in the screening mechanism performs physical screening by utilizing settling velocity; flocculent sludge and free filamentous bacteria which are low in settling speed are abandoned from returned sludge, original granular sludge (or called heavy sludge) which is high in settling speed is left, sludge particles are screened, and the screening mechanism rotates downwards along the inner wall under the action of centrifugal force while sludge distribution is achieved, so that the sludge particles are separated from the sludge. According to the sludge screening system for the sewage plant, vertical upward reverse light sludge rotational flow is generated at the conical bottom due to the pressure difference, large-particle sludge can be crushed, and in conclusion, the sludge screening system for the sewage plant can effectively improve the sewage treatment efficiency and the sludge quality, simplify the operation process and reduce the operation cost.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental engineering, in particular to a sludge screening system for a sewage treatment plant. Background Technique

[0002] In view of the fact that a large amount of sludge generated in the sewage treatment process needs to be effectively treated to reduce its volume and recover valuable components therein, since the foam caused by harmful organisms generally floats on the water surface, the existing physical separator selectively removes the floating foam layer on the water surface while retaining the relatively dense sludge at the bottom, and the existing return sludge is designed to send the return sludge into the sludge thickening area by the return sludge pump arranged in the SBR tank (sequencing batch reactor). It is particularly important to develop an efficient sludge screening system, so there is a particular need for a sludge screening system for a sewage treatment plant.

[0003] In most existing sewage treatment plants, due to the adoption of the activated sludge process, the raw water quality and quantity vary greatly in different places. At the same time, there are many process parameters and influencing factors in the activated sludge process, and there are many problems such as filamentous bulking, viscous sludge bulking, scum foam and sludge floating caused by the interference of the activated sludge, resulting in a reduction in its treatment efficiency. Content of the Utility Model

[0004] The purpose of the utility model is to provide a sludge screening system for a sewage treatment plant to solve the problems in the above-mentioned background technique, that is, in most sewage treatment plants, due to the adoption of the activated sludge process, the raw water quality and quantity vary greatly in different places. At the same time, there are many process parameters and influencing factors in the activated sludge process, and there are many problems such as filamentous bulking, viscous sludge bulking, scum foam and sludge floating caused by the interference of the activated sludge.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A sludge screening system for a sewage treatment plant, including a first support column, a first limiting ring is fixedly connected to the upper surface of the first support column, a sludge bucket is fixedly connected to one side surface of the first limiting ring, a sludge transport pipe is fixedly connected to the lower surface of the sludge bucket, a second support column is fixedly connected to the inner surface of the sludge bucket, a screening water bucket is fixedly connected to the upper surface of the second support column, a screening water bucket cover is fixedly connected to the upper surface of the screening water bucket, a fixing ring is fixedly connected to one side surface of the screening water bucket, a second limiting ring is fixedly connected to one side surface of the fixing ring, a sewage pipe is fixedly connected to one side surface of the screening water bucket, and a screening mechanism is arranged on one side surface of the second limiting ring;

[0006] The screening mechanism includes a cylindrical screening tube, a conical screening tube, a special-shaped pipe, a water pump, a water inlet pipe, a screened-out pipe, and a screened-out annular pipe. One side surface of the second limiting ring is fixedly connected to the cylindrical screening tube. The lower surface of the cylindrical screening tube is fixedly connected to the conical screening tube. The upper surface of the cylindrical screening tube is fixedly connected to the special-shaped pipe. One side surface of the special-shaped pipe is fixedly connected to the water pump. One side surface of the water pump is fixedly connected to the water inlet pipe. The inner surface of the special-shaped pipe is fixedly connected to the screened-out pipe. The upper surface of the screened-out pipe is fixedly connected to the screened-out annular pipe.

[0007] Preferably, multiple groups of the first support columns are symmetrically arranged with respect to the central axis of the sludge bucket, and multiple groups of the second support columns are symmetrically arranged with respect to the central axis of the screening water bucket cover.

[0008] Preferably, multiple groups of the first limiting rings are symmetrically arranged with respect to the central axis of the second support column, and the sludge bucket is fixedly connected to the first support column through the first limiting ring.

[0009] Preferably, the screening water bucket is fixedly connected to the sludge bucket through the second support column. Multiple groups of the cylindrical screening tubes are symmetrically arranged with respect to the central axis of the screening water bucket, and multiple groups of the conical screening tubes are symmetrically arranged with respect to the central axis of the fixed ring.

[0010] Preferably, multiple groups of the special-shaped pipes are symmetrically arranged with respect to the central axis of the sludge bucket, and the conical screening tube is fixedly connected to the special-shaped pipe through the cylindrical screening tube.

[0011] Preferably, multiple groups of the water pumps are symmetrically arranged with respect to the central axis of the screening water bucket, and the cylindrical screening tube is fixedly connected to the fixed ring through the second limiting ring.

[0012] Preferably, multiple groups of the water inlet pipes are symmetrically arranged with respect to the central axis of the sludge bucket, and multiple groups of the screened-out pipes are symmetrically arranged with respect to the central axis of the screening water bucket.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: For a sludge screening system used in a sewage treatment plant, through the setting of the screening mechanism, when sewage needs to be screened, the sewage pipeline injects sewage into the screening water bucket, and then the sewage enters the special-shaped pipeline through the water pump. Through the guiding effect of the special-shaped pipeline, the sewage will flow downward in a spiral form into the cylindrical screening pipe and then through the conical screening pipe. The cyclone separator in the sludge screening system uses the difference in sedimentation velocity to physically screen granular sludge, discarding the flocculent sludge with a slower sedimentation velocity and free filamentous bacteria from the return sludge, and leaving the primary granular sludge (or called heavy sludge) with a faster sedimentation velocity, realizing the screening of sludge particles. And while the screening mechanism realizes the diversion of sludge, it rotates downward along the inner wall by centrifugal force, and a reverse light sludge cyclone vertically upward is generated at the conical bottom due to the pressure difference, which can also break large granular sludge. After long-term operation, it will have a beneficial impact on the biochemical reactor using the activated sludge or granular sludge process. Therefore, the liquid will enter the screening-out annular pipeline through the screening-out pipeline and enter the next process, while the sludge enters the middle of the sludge bucket from the conical screening pipe and is finally transported to the designated area by the sludge transport pipe. To sum up, this sludge screening system for sewage treatment plants can effectively improve the sewage treatment efficiency and sludge quality, simplify the operation process, and reduce the operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic side view of the external structure of the utility model;

[0015] Figure 2 is a schematic view of the external structure of the cooperation between the screening water bucket and the second support column of the utility model;

[0016] Figure 3 is a schematic side view of the external structure of the screening mechanism of the utility model;

[0017] Figure 4 is a schematic view of the single-piece structure of the screening mechanism of the utility model;

[0018] In the figure: 1, the first support column; 2, the first limiting ring; 3, the sludge bucket; 4, the sludge transport pipe; 5, the second support column; 6, the screening water bucket; 7, the screening water bucket cover; 8, the fixed ring; 9, the second limiting ring; 10, the sewage pipeline; 11, the screening mechanism; 1101, the cylindrical screening pipe; 1102, the conical screening pipe; 1103, the special-shaped pipeline; 1104, the water pump; 1105, the inlet pipeline; 1106, the screening-out pipeline; 1107, the screening-out annular pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1-4 , the present invention provides a technical solution: a sludge screening system for a sewage treatment plant, including a first support column 1, a first limit ring 2 is fixedly connected to the upper surface of the first support column 1, a sludge bucket 3 is fixedly connected to one side surface of the first limit ring 2, a sludge transportation pipe 4 is fixedly connected to the lower surface of the sludge bucket 3, a second support column 5 is fixedly connected to the inner surface of the sludge bucket 3, a screening water bucket 6 is fixedly connected to the upper surface of the second support column 5, a screening water bucket cover 7 is fixedly connected to the upper surface of the screening water bucket 6, a fixing ring 8 is fixedly connected to one side surface of the screening water bucket 6, a second limit ring 9 is fixedly connected to one side surface of the fixing ring 8, a sewage pipe 10 is fixedly connected to one side surface of the screening water bucket 6, and a screening mechanism 11 is arranged on one side surface of the second limit ring 9;

[0021] The screening mechanism 11 includes a cylindrical screening pipe 1101, a conical screening pipe 1102, a special-shaped pipe 1103, a water pump 1104, a water inlet pipe 1105, a screened-out pipe 1106, and a screened-out annular pipe 1107. One side surface of the second limiting ring 9 is fixedly connected to the cylindrical screening pipe 1101. The lower surface of the cylindrical screening pipe 1101 is fixedly connected to the conical screening pipe 1102. The upper surface of the cylindrical screening pipe 1101 is fixedly connected to the special-shaped pipe 1103. One side surface of the special-shaped pipe 1103 is fixedly connected to the water pump 1104. One side surface of the water pump 1104 is fixedly connected to the water inlet pipe 1105. The inner surface of the special-shaped pipe 1103 is fixedly connected to the screened-out pipe 1106. The upper surface of the screened-out pipe 1106 is fixedly connected to the screened-out annular pipe 1107. Through the settings of the cylindrical screening pipe (1101), the conical screening pipe (1102), the special-shaped pipe (1103), the water pump (1104), the water inlet pipe (1105), the screened-out pipe (1106), and the screened-out annular pipe (1107), when in use, the sewage pipe 10 injects sewage into the screening water bucket 6. Then, the water pump 1104 makes the sewage enter the special-shaped pipe 1103 from the water inlet pipe 1105. Through the guiding function of the special-shaped pipe 1103, the sewage will flow downward in a spiral shape into the cylindrical screening pipe 1101 and then through the conical screening pipe 1102. Among them, the hydrocyclone in the sludge screening system uses the difference in sedimentation velocity to physically screen the granular sludge, discarding the flocculent sludge with a slower sedimentation velocity and the free filamentous bacteria from the returned sludge, and leaving the primary granular sludge (or called heavy sludge) with a faster sedimentation velocity, realizing the screening of sludge particles. And while the screening mechanism 11 realizes the sludge diversion, it rotates downward along the inner wall by centrifugal force, and a reverse light sludge swirl vertically upward is generated at its conical bottom due to the pressure difference, which can also realize the crushing of large granular sludge. After long-term operation, it will have a beneficial impact on the biochemical reactor adopting the activated sludge or granular sludge process. Therefore, the liquid will enter the screened-out annular pipe 1107 from the screened-out pipe 1106 and enter the next process, while the sludge enters the middle of the sludge bucket 3 from the conical screening pipe 1102 and is finally transported to the designated area by the sludge transportation pipe 4. To sum up, this sludge screening system for sewage treatment plants can effectively improve the sewage treatment efficiency and sludge quality, simplify the operation process, and reduce the operation cost, which is a very practical and efficient design scheme.

[0022] Furthermore, multiple groups of the first support columns 1 are symmetrically arranged with respect to the central axis of the sludge bucket 3, and multiple groups of the second support columns 5 are symmetrically arranged with respect to the central axis of the screening water bucket cover 7. Through the settings of the first support columns 1, the sludge bucket 3, the second support columns 5, and the screening water bucket cover 7, when in use, the symmetrical arrangement can ensure the uniform force of the overall structure in all directions, avoid local stress concentration, and thus improve the stability of the entire system.

[0023] Furthermore, multiple groups of the first limiting rings 2 are symmetrically arranged with respect to the central axis of the second support column 5. The sludge bucket 3 is fixedly connected to the first support column 1 through the first limiting rings 2. Through the arrangement of the first support column 1, the first limiting rings 2, the sludge bucket 3, and the second support column 5, during use, by symmetrically arranging the first limiting rings 2 on the central axis of the second support column 5 and fixedly connecting the sludge bucket 3 to the first support column 1 through the first limiting rings 2, the stability and load-bearing capacity of the overall structure can be significantly improved. At the same time, the installation and maintenance processes are simplified, and safety is enhanced.

[0024] Furthermore, the screening water bucket 6 is fixedly connected to the sludge bucket 3 through the second support column 5. Multiple groups of cylindrical screening pipes 1101 are symmetrically arranged with respect to the central axis of the screening water bucket 6. Multiple groups of conical screening pipes 1102 are symmetrically arranged with respect to the central axis of the fixing ring 8. Through the above settings, during use, through the fixed connection between the screening water bucket 6 and the sludge bucket 3, and the symmetrical arrangement of the cylindrical screening pipes 1101 and the conical screening pipes 1102, the stability and screening efficiency of the overall structure can be significantly improved, and the overall stability is enhanced.

[0025] Furthermore, multiple groups of special-shaped pipes 1103 are symmetrically arranged with respect to the central axis of the sludge bucket 3. The conical screening pipes 1102 are fixedly connected to the special-shaped pipes 1103 through the cylindrical screening pipes 1101. Through the arrangement of the special-shaped pipes 1103, during use, when sewage enters the special-shaped pipes 1103 from the water inlet pipe, it obtains the kinetic energy during rotation, which is beneficial for further screening of the sewage.

[0026] Furthermore, multiple groups of water pumps 1104 are symmetrically arranged with respect to the central axis of the screening water bucket 6. The cylindrical screening pipes 1101 are fixedly connected to the fixing ring 8 through the second limiting rings 9. Through the arrangement of the screening water bucket 6, the fixing ring 8, the second limiting rings 9, and the water pumps 1104, during use, by symmetrically arranging the water pumps 1104 on the central axis of the screening water bucket 6, the stress on the overall structure in all directions can be ensured to be balanced, avoiding local stress concentration. The fixed connection between the cylindrical screening pipes 1101 and the fixing ring 8 through the second limiting rings 9 can improve the rigidity of the entire system and make it more stable. The symmetrical arrangement of the water pumps 1104 can ensure the uniform distribution of water flow in the screening water bucket 6, which helps to improve the screening efficiency.

[0027] Furthermore, multiple groups of water inlet pipes 1105 are symmetrically arranged with respect to the central axis of the sludge bucket 3. Multiple groups of screened-out pipes 1106 are symmetrically arranged with respect to the central axis of the screening water bucket 6. Through the arrangement of the sludge bucket 3, the screening water bucket 6, the water inlet pipes 1105, and the screened-out pipes 1106, during use, by symmetrically arranging the water inlet pipes 1105 on the central axis of the sludge bucket 3, the stress during the water inlet process can be ensured to be balanced, avoiding local stress concentration, thereby improving the stability of the overall structure. Similarly, the symmetrical arrangement of the screened-out pipes 1106 helps to ensure the uniform pressure distribution inside the screening water bucket 6 and improve the structural stability.

[0028] Working principle: When sewage needs to be screened, the sewage pipeline 10 injects the sewage into the screening water bucket 6, and then through the water pump 1104, the sewage enters the special-shaped pipeline 1103 from the water inlet pipeline 1105. Through the diversion effect of the special-shaped pipeline 1103, the sewage will flow downward in a spiral form into the cylindrical screening pipe 1101 and then through the conical screening pipe 1102. Among them, the cyclone separator in the sludge screening system uses the difference in sedimentation velocity to physically screen the granular sludge, discarding the flocculent sludge with a slower sedimentation velocity and the free filamentous bacteria from the returned sludge, and leaving the primary granular sludge (or called heavy sludge) with a faster sedimentation velocity, realizing the screening of sludge particles. And while the screening mechanism 11 realizes the sludge diversion, it rotates downward along the inner wall by centrifugal force, and a reverse light sludge swirl vertically upward is generated at its conical bottom due to the pressure difference, which can also realize the crushing of large granular sludge. After long-term operation, it will have a beneficial effect on the biochemical reactor adopting the activated sludge or granular sludge process. Therefore, the liquid will enter the screening annular pipeline 1107 from the screening pipeline 1106 and enter the next process, while the sludge enters the middle of the sludge bucket 3 from the conical screening pipe 1102 and is finally transported to the designated area by the sludge transportation pipe 4. To sum up, this sludge screening system for sewage treatment plants can effectively improve the sewage treatment efficiency and sludge quality, simplify the operation process, and reduce the operation cost. The model of the water pump 1104 is PW-175EAH.

[0029] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sludge screening system for a sewage treatment plant, comprising a first support column (1), characterized in that: The upper surface of the first support column (1) is fixedly connected with a first limiting ring (2). One side surface of the first limiting ring (2) is fixedly connected with a silt bucket (3). The lower surface of the silt bucket (3) is fixedly connected with a silt transport pipe (4). The inner surface of the silt bucket (3) is fixedly connected with a second support column (5). The upper surface of the second support column (5) is fixedly connected with a screening water bucket (6). The upper surface of the screening water bucket (6) is fixedly connected with a screening water bucket cover (7). One side surface of the screening water bucket (6) is fixedly connected with a fixing ring (8). One side surface of the fixing ring (8) is fixedly connected with a second limiting ring (9). One side surface of the screening water bucket (6) is fixedly connected with a sewage pipe (10). A screening mechanism (11) is arranged on one side surface of the second limiting ring (9). The screening mechanism (11) includes a cylindrical screening pipe (1101), a conical screening pipe (1102), a special-shaped pipe (1103), a water pump (1104), a water inlet pipe (1105), a screened-out pipe (1106), and a screened-out annular pipe (1107). One side surface of the second limiting ring (9) is fixedly connected with a cylindrical screening pipe (1101). The lower surface of the cylindrical screening pipe (1101) is fixedly connected with a conical screening pipe (1102). The upper surface of the cylindrical screening pipe (1101) is fixedly connected with a special-shaped pipe (1103). One side surface of the special-shaped pipe (1103) is fixedly connected with a water pump (1104). One side surface of the water pump (1104) is fixedly connected with a water inlet pipe (1105). The inner surface of the special-shaped pipe (1103) is fixedly connected with a screened-out pipe (1106). The upper surface of the screened-out pipe (1106) is fixedly connected with a screened-out annular pipe (1107).

2. The sludge screening system for a sewage treatment plant according to claim 1, wherein: Multiple groups of the first support columns (1) are symmetrically arranged with respect to the central axis of the silt bucket (3). Multiple groups of the second support columns (5) are symmetrically arranged with respect to the central axis of the screening water bucket cover (7).

3. A sludge screening system for a sewage treatment plant according to claim 1, characterized in that: Multiple groups of the first limiting rings (2) are symmetrically arranged with respect to the central axis of the second support column (5). The silt bucket (3) is fixedly connected to the first support column (1) through the first limiting ring (2).

4. A sludge screening system for a sewage treatment plant according to claim 1, characterized in that: The screening water bucket (6) is fixedly connected to the silt bucket (3) through the second support column (5). Multiple groups of the cylindrical screening pipes (1101) are symmetrically arranged with respect to the central axis of the screening water bucket (6). Multiple groups of the conical screening pipes (1102) are symmetrically arranged with respect to the central axis of the fixing ring (8).

5. A sludge screening system for a sewage treatment plant according to claim 1, characterized in that: Multiple groups of the special-shaped pipes (1103) are symmetrically arranged with respect to the central axis of the silt bucket (3). The conical screening pipe (1102) is fixedly connected to the special-shaped pipe (1103) through the cylindrical screening pipe (1101).

6. The sludge screening system for a sewage treatment plant according to claim 1, characterized in that: Multiple groups of the water pumps (1104) are symmetrically arranged with respect to the central axis of the screening water bucket (6). The cylindrical screening pipe (1101) is fixedly connected to the fixing ring (8) through the second limiting ring (9).

7. A sludge screening system for a sewage treatment plant according to claim 1, characterized in that: A plurality of groups of the water inlet pipes (1105) are symmetrically arranged with respect to the central axis of the silt bucket (3), and a plurality of groups of the screening pipes (1106) are symmetrically arranged with respect to the central axis of the screening water bucket (6).

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