Sewage treatment tank

Abstract

The utility model relates to a sewage treatment tank. Comprising a primary sedimentation tank with an open top and a conical bottom, a closed secondary sedimentation tank with a flat bottom and a dosing device, a supporting platform is mounted at the top of the primary settling tank, a center cylinder with the lower end extending to a conical bottom is arranged in the center of the supporting platform, a mixing box is further mounted at the top of the primary settling tank, a sewage input pipe is connected to an inlet of the mixing box, and an outlet of the mixing box is connected to the center cylinder through a conveying pipe; a sludge scraping assembly rotating around the central cylinder is also mounted in the primary settling tank; a water outlet of the primary settling tank is connected to a water inlet of the secondary settling tank through a drain pipe; a stirring shaft and an impeller which are driven by a stirring motor are arranged in the secondary settling tank; and a filtering pore plate is arranged at the bottom of the inner cavity of the secondary settling tank. According to the sewage treatment device, a two-stage dosing coagulation accelerating effect is applied to sewage, so that pollutant components in the sewage are fully treated, and formed settled sludge is reasonably collected.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment equipment, in particular to a sewage treatment tank. Background Art

[0002] The sewage treatment process encompasses steps such as pre-filtration, chemical addition to promote sedimentation, and sedimentation to form sludge. Typically, pre-filtration is performed to remove bulk floating debris and large-sized particulate matter from the sewage. Afterward, chemical coagulation is performed, which involves adding coagulants and flocculants to form flocs from the pollutants in the sewage, which then settle to form sludge. Because the pollutants in sewage are often quite diverse, a single step of chemical addition to promote coagulation and conversion to sludge is often insufficient to fully treat them. Multiple stages of chemical addition and sludge removal are typically required.

[0003] The sewage treatment facilities in the existing technology have a single function and it is difficult to exert a sufficient coagulant effect on sewage. It is necessary to develop new sewage treatment tank facilities. Utility Model Content

[0004] The utility model aims to provide a sewage treatment tank, which applies a two-stage dosing and accelerating coagulation effect to sewage, ensures that the pollutant components in the sewage are fully treated, and reasonably collects the formed settled sludge.

[0005] The technical solution adopted by the utility model is: a sewage treatment tank, including a primary sedimentation tank with an open top and a conical bottom, a closed secondary sedimentation tank with a flat bottom, and a dosing device; a supporting platform is installed on the top of the primary sedimentation tank, and a central cylinder with a lower end extending to the conical bottom is provided at the center of the supporting platform; a mixing box is also installed on the top of the primary sedimentation tank, a sewage input pipe is connected to the inlet of the mixing box, and the outlet of the mixing box is connected to the central cylinder through a delivery pipe; a sludge scraping assembly rotating around the central cylinder is also installed inside the primary sedimentation tank, and the water outlet of the primary sedimentation tank is connected to the water inlet of the secondary sedimentation tank through a drain pipe; a stirring shaft and an impeller driven by a stirring motor are installed inside the secondary sedimentation tank, a filter plate is installed at the bottom of the inner cavity of the secondary sedimentation tank, a sewage cleaning port and a sewage cleaning door are provided on the side wall of the secondary sedimentation tank, and a water collecting box is provided at the bottom center of the secondary sedimentation tank, and the water collecting box is connected to the space below the filter plate in the secondary sedimentation tank through multiple drainage pipes.

[0006] Preferably, an annular overflow trough is provided at the top of the inner cavity of the first-stage sedimentation tank, and the water outlet is located on the outer wall of the overflow trough.

[0007] Preferably, the scraper assembly includes a shaft seat installed in the middle and upper part of the central tube, a rotating swing arm is installed on the shaft seat, a gear ring is installed at the root of the swing arm, a drive motor is installed on the upper part of the central tube, a drive gear meshing with the gear ring is installed on the output shaft of the drive motor, a connecting arm is installed below the outer end of the swing arm, a scraper blade is installed on the outside of the connecting arm, and the outer edge of the scraper blade contacts the inner wall of the first-stage sedimentation tank.

[0008] Preferably, an annular support track is installed on the upper part of the inner wall of the first-stage sedimentation tank, and a track block is installed below the outer end of the rotary arm, and the track block slides along the annular support track.

[0009] Preferably, the stirring shaft and impeller include a stirring shaft located in the center, a horizontal crossbeam installed in the middle of the stirring shaft, multiple longitudinal beams installed on the crossbeam, a stirring impeller installed on each longitudinal beam, and a scraping plate installed at the lower end of each longitudinal beam, and the bottom edge of each scraping plate is in contact with the filter plate.

[0010] Preferably, the dosing device includes a plurality of liquid medicine tanks, each with a stirring assembly, and each liquid medicine tank is equipped with a dosing pump, wherein the outlet of one group of dosing pumps is connected to the central cylinder and the mixing tank through a dosing pipe, and the outlet of another group of dosing pumps is connected to the secondary sedimentation tank through a dosing pipe.

[0011] Preferably, a sewage valve is installed at the bottom of the conical bottom of the first-stage sedimentation tank, and a water drain valve is installed at the bottom of the water collecting tank below the second-stage sedimentation tank.

[0012] Preferably, the first-level sedimentation tank and the second-level sedimentation tank are each supported by a plurality of columns; safety guardrails are installed on both sides of the support platform of the first-level sedimentation tank, and a ladder is installed on the outer wall of the first-level sedimentation tank.

[0013] The advantages and positive effects of the utility model are:

[0014] The utility model provides a sewage treatment tank. Compared with the existing sewage treatment facilities, the sewage treatment tank in the utility model provides a two-stage dosing and coagulation effect on the sewage, ensuring that the pollutant components in the sewage are fully treated. According to the characteristics of the pollutant components in the sewage, a dosing device can be used to perform dosing in two steps, making the sewage dosing and coagulation precipitation process more rational and effectively promoting the conversion of pollutant components into sludge.

[0015] By installing a scraper assembly inside the primary sedimentation tank, the sludge settled within the tank is scraped and collected toward the conical bottom, ultimately draining through the bottom drain valve. The scraper assembly also serves as the agitator for the primary sedimentation tank. By installing an agitator shaft and impeller inside the secondary sedimentation tank, the internal sewage is agitated, promoting mixing between the added liquid medicine and the sewage. The coagulated sludge is trapped above the filter plate, allowing for periodic cleaning by opening the cleaning door. Therefore, the sewage treatment tank of this utility model is capable of effectively collecting the settled sludge generated within the two-stage sedimentation tanks. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0017] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the middle-level sedimentation tank, from the upper perspective.

[0018] In the picture:

[0019] 1. Ladder; 2. Drain valve; 3. Primary sedimentation tank; 4. Center tube; 5. Swing arm; 6. Overflow chute; 7. Support platform; 8. Safety guardrail; 9. Delivery pipe; 10. Mixing box; 11. Drive motor; 12. Connecting arm; 13. Annular support track; 14. Scraper; 15. Sewage inlet pipe; 16. Drain pipe; 17. Dosing pipe; 18. Filter plate; 19. Discharge pipe; 20. Water inlet; 21. Stirring motor; 22. Secondary sedimentation tank; 23. Stirring shaft and impeller; 24. Cleaning door; 25. Dosing device; 26. Water collecting tank; 27. Drain valve. DETAILED DESCRIPTION

[0020] In order to further understand the content, features and effects of the present invention, the following embodiments are given to illustrate in detail.

[0021] See Figure 1 and Figure 2 The sewage treatment tank of the present invention includes a primary sedimentation tank 3 with an open top and a conical bottom, a closed secondary sedimentation tank 22 with a flat bottom, and a dosing device 25. The sewage first enters the primary sedimentation tank 3, where a selected chemical solution is added for primary coagulation and sedimentation. After that, the upper sewage enters the secondary sedimentation tank 22, where a selected chemical solution is added for secondary coagulation and sedimentation.

[0022] A support platform 7 is mounted on top of the primary settling tank 3, and a central tube 4, the lower end of which extends to a conical bottom, is located in the center of the support platform 7. A mixing tank 10 is also mounted on top of the primary settling tank 3. A sewage inlet pipe 15 is connected to the inlet of the mixing tank 10, and the outlet of the mixing tank 10 is connected to the central tube 4 via a delivery pipe 9. The mixing tank 10 is used for adding chemicals to the sewage. The sewage inlet pipe 15 feeds the sewage into the mixing tank 10, where it mixes with the coagulant delivered.

[0023] As shown in the figure, the mixing box 10 has two mixing chambers. An overflow port is located at the top of the partition wall between the two mixing chambers. A delivery pipe 9 is connected to the outlet of one of the mixing chambers. The inlet of each mixing chamber is connected to a sewage inlet pipe 15. Different sewage inlet pipes 15 can be connected to different sewage supply pipelines. The sewage entering the mixing chamber of the mixing box 10 through the sewage inlet pipes 15 has a certain flow rate, thus having a flushing effect. This flushing effect promotes thorough mixing between the liquid medicine added to the mixing chamber and the sewage.

[0024] Since the delivery pipe 9 directly injects the doped sewage into the central tube 4, the sewage entering the primary sedimentation tank 3 is injected into the tank through the central tube 4. The sewage entering the central tube 4 flows downward and is finally discharged into the inner cavity of the primary sedimentation tank 3 through the bottom port of the central tube 4. This can minimize the impact of the newly entered sewage on the sewage in the primary sedimentation tank 3.

[0025] In this embodiment, the first-level sedimentation tank 3 and the second-level sedimentation tank 22 are each supported by multiple columns. Safety guardrails 8 are installed on both sides of the support platform 7 of the first-level sedimentation tank 3 to prevent people from falling, and a ladder 1 is installed on the outer wall of the first-level sedimentation tank 3 to facilitate people to climb onto the support platform 7.

[0026] A scraper assembly is also installed inside the primary settling tank 3, rotating around the central cylinder 4. In this embodiment, the scraper assembly includes a shaft seat mounted in the upper middle portion of the central cylinder 4, a rotatable swing arm 5 mounted on the shaft seat, a gear ring mounted at the base of the swing arm 5, a drive motor 11 mounted above the central cylinder 4, a drive gear meshing with the gear ring mounted on the output shaft of the drive motor 11, a connecting arm 12 mounted below the outer end of the swing arm 5, and a scraper blade 14 mounted on the outer side of the connecting arm 12. The outer edge of the scraper blade 14 contacts the inner wall of the primary settling tank 3. Specifically, as shown in the figure, the scraper blade 14 is L-shaped, with the outer edge of the upper portion contacting the inner wall of the primary settling tank 3 and the outer edge of the lower portion contacting the inner wall of the conical bottom.

[0027] In this embodiment, an annular support track 13 is installed on the upper part of the inner wall of the first-stage sedimentation tank 3, and a track block is installed below the outer end of the rotary arm 5, and the track block slides along the annular support track 13, thereby providing sufficient support for the outer end of the rotary arm 5 and improving the stability of the scraper assembly during rotation and displacement.

[0028] The scraper assembly also serves as the agitator for the primary settling tank 3. The drive motor 11 slowly rotates the rotary arm 5, causing the connecting arm 12 and its scraper blade 14 to agitate the wastewater within. After a period of quiescence, suspended particles in the wastewater within the primary settling tank 3 settle, forming settled sludge at the bottom and a clear liquid at the top.

[0029] A drain valve 2 is installed at the bottom of the conical bottom of the first-stage sedimentation tank 3. During the sewage discharge stage, the drain valve 2 is opened and the sludge scraping assembly operates at the same time to scrape the sludge on the inner wall of the tank and collect the sludge in the conical bottom below.

[0030] The outlet of the primary sedimentation tank 3 is connected to the inlet of the secondary sedimentation tank 22 via a drain pipe 16, enabling wastewater transfer between tanks. In this embodiment, an annular overflow trough 6 is provided at the top of the inner cavity of the primary sedimentation tank 3, with the outlet located on the outer wall of the overflow trough 6. The supernatant in the primary sedimentation tank 3 overflows into the overflow trough 6 and then enters the drain pipe 16 through the outlet.

[0031] A stirring shaft and an impeller 23 driven by a stirring motor 21 are installed inside the secondary sedimentation tank 22, a filter plate 18 is installed at the bottom of the inner cavity of the secondary sedimentation tank 22, and a sewage cleaning port and a sewage cleaning door 24 are installed on the side wall of the secondary sedimentation tank 22.

[0032] The stirring motor 21, stirring shaft and impeller 23 are used to stir the sewage in the tank to promote mixing of the added liquid medicine with the sewage. The coagulated sewage passes downward through the filter plate 18, and the coagulated sediment is filtered and trapped at the top by the filter plate 18.

[0033] In this embodiment, the agitator shaft and impeller 23 include a centrally located agitator shaft, a horizontal crossbeam mounted in the middle of the agitator shaft, multiple longitudinal beams mounted on the crossbeam, and a stirring impeller mounted on each longitudinal beam. A scraper plate is mounted at the lower end of each longitudinal beam, with the bottom edge of each scraper plate contacting the filter plate 18. Rotation of the agitator shaft and impeller 23 promotes mixing of the wastewater and the added chemical solution. Furthermore, the scraper plates at the bottom continuously scrape the surface of the filter plate 18, preventing coagulant precipitates that settle on the filter plate 18 from clogging the filter pores.

[0034] A water collection tank 26 is located at the bottom center of the secondary sedimentation tank 22. This tank is connected to the space within the secondary sedimentation tank 22, below the filter plate 18, via multiple drainage pipes 19. Treated wastewater that has passed through the filter plate 18 is discharged through the drainage pipes 19 out of the tank and into the water collection tank 26. A drain valve 27 is installed at the bottom of the water collection tank 26 below the secondary sedimentation tank 22. Opening this valve allows the wastewater in the water collection tank 26 and the secondary sedimentation tank 22 to be discharged.

[0035] The dosing device 25 includes multiple liquid medicine tanks, each with a stirring assembly. Each liquid medicine tank is equipped with a dosing pump. The outlets of one set of dosing pumps are connected to the central cylinder 4 and the mixing tank 10 via a dosing pipe 17, while the outlets of another set of dosing pumps are connected to the secondary sedimentation tank 22 via a dosing pipe 17. Different liquid medicine tanks store different types of liquid medicine. By controlling the operation of the dosing pumps, the corresponding required liquid medicine is delivered to the primary sedimentation tank 3 and the secondary sedimentation tank 22.

[0036] As shown in the figure, the dosing pipe 17 of the primary sedimentation tank 3 extends to the two mixing chambers of the mixing box 10 and extends to the central tube 4 at the same time, so that drugs can be added to the two mixing chambers and the central tube 4 at the same time. The dosing pipe 17 of the secondary sedimentation tank 22 is connected to the dosing port set on the top of the tank, and the liquid medicine is directly added to the interior of the secondary sedimentation tank 22.

[0037] How to run:

[0038] Sewage enters the mixing chamber of the mixing box 10 through the sewage inlet pipe 15. At the same time, the dosing device 25 delivers liquid medicine to the mixing box 10. The sewage mixed with the liquid medicine is delivered to the central tube 4 through the delivery pipe 9. The sewage flows downward into the primary sedimentation tank 3. At the same time, the dosing pipe 17 also adds some liquid medicine to the central tube 4. This liquid medicine mixes with the sewage in the central tube 4 and the tank.

[0039] The scraper assembly rotates slowly to provide a stirring effect. As sewage is added, the coagulant sediment settles to the bottom of the tank to form sludge, and the level of the supernatant rises. As a result, the upper sewage enters the overflow tank 6 and then enters the secondary sedimentation tank 22 through the drain pipe 16. When the sludge in the primary sedimentation tank 3 accumulates to a certain level (for example, it has filled the conical bottom), the injection of sewage into the tank is stopped. At this time, the drain valve 2 can be opened and the scraper assembly rotates slowly to provide a scraping effect. The sludge in the tank is collected in the conical bottom and eventually discharged out of the tank through the drain valve 2.

[0040] In the secondary sedimentation tank 22, the dosing device 25 adds liquid medicine into the tank, and the stirring component continuously stirs the sewage to promote mixing and flocculation. The pollutant components flocculate to form sludge. Due to the continuous stirring action of the stirring component and the continuous scraping action of the scraper plate at the lower end on the surface of the filter plate 18, the flocculated sediment cannot be stably settled in the tank; after the process time is reached, the drain valve 27 at the bottom is opened, and the sewage in the tank passes through the filter plate 18 and enters the water collection tank 26 through the discharge pipes 19, and is finally discharged by the drain valve 27; during this process, the stirring component should keep running, and eventually the coagulated sediment is trapped above the filter plate 18. The cleaning door 24 on the side is opened to enter the interior to clean the sediment at the bottom of the tank.

Claims

1. A sewage treatment tank, characterized by: The invention comprises a primary sedimentation tank (3) with an open top and a conical bottom, a closed secondary sedimentation tank (22) with a flat bottom, and a dosing device (25); a support platform (7) is installed on the top of the primary sedimentation tank (3), and a central cylinder (4) with a lower end extending to the conical bottom is provided at the center of the support platform (7); a mixing box (10) is also installed on the top of the primary sedimentation tank (3); a sewage input pipe (15) is connected to the inlet of the mixing box (10); the outlet of the mixing box (10) is connected to the central cylinder (4) through a delivery pipe (9); a sludge scraping assembly rotating around the central cylinder (4) is also installed inside the primary sedimentation tank (3); The water outlet of the sedimentation tank (3) is connected to the water inlet (20) of the secondary sedimentation tank (22) through a drain pipe (16); a stirring shaft and an impeller (23) driven by a stirring motor (21) are installed inside the secondary sedimentation tank (22); a filter plate (18) is installed at the bottom of the inner cavity of the secondary sedimentation tank (22); a sewage cleaning port and a sewage cleaning door (24) are provided on the side wall of the secondary sedimentation tank (22); a water collecting box (26) is provided at the bottom center of the secondary sedimentation tank (22); the water collecting box (26) is connected to the space below the filter plate (18) in the secondary sedimentation tank (22) through a plurality of drainage pipes (19).

2. The sewage treatment tank according to claim 1, wherein: An annular overflow trough (6) is provided on the top of the inner cavity of the first-stage sedimentation tank (3), and a water outlet is located on the outer wall of the overflow trough (6).

3. The sewage treatment tank according to claim 2, wherein: The scraper assembly comprises a shaft seat mounted on the middle and upper part of a central cylinder (4); a rotary arm (5) is mounted on the shaft seat; a gear ring is mounted at the root of the rotary arm (5); a drive motor (11) is mounted on the upper part of the central cylinder (4); a drive gear meshing with the gear ring is mounted on the output shaft of the drive motor (11); a connecting arm (12) is mounted below the outer end of the rotary arm (5); a scraper blade (14) is mounted on the outer side of the connecting arm (12); and the outer edge of the scraper blade (14) contacts the inner wall of the primary sedimentation tank (3).

4. The sewage treatment tank as claimed in claim 3, wherein: An annular support track (13) is installed on the upper portion of the inner wall of the first-stage sedimentation tank (3), and a track block is installed below the outer end of the rotary arm (5), and the track block slides along the annular support track (13).

5. The sewage treatment tank according to claim 1, wherein: The stirring shaft and impeller (23) include a stirring shaft located in the center, a horizontal crossbeam installed in the middle of the stirring shaft, a plurality of longitudinal beams installed on the crossbeam, a stirring impeller installed on each longitudinal beam, a scraping plate installed at the lower end of each longitudinal beam, and the bottom edge of each scraping plate contacts the filter plate (18).

6. The sewage treatment tank according to any one of claims 1 to 5, characterized in that: The dosing device (25) includes a plurality of liquid medicine tanks, each of which is provided with a stirring assembly. Each liquid medicine tank is equipped with a dosing pump. The outlets of one group of dosing pumps are connected to the central cylinder (4) and the mixing tank (10) through a dosing pipe (17), and the outlets of another group of dosing pumps are connected to the secondary sedimentation tank (22) through a dosing pipe (17).

7. The sewage treatment tank according to any one of claims 1 to 5, wherein: A drain valve (2) is installed at the bottom of the conical bottom of the first-stage sedimentation tank (3), and a drain valve (27) is installed at the bottom of the water collecting tank (26) below the second-stage sedimentation tank (22).

8. The sewage treatment tank according to any one of claims 1 to 5, characterized in that: The first-stage sedimentation tank (3) and the second-stage sedimentation tank (22) are each supported by a plurality of columns; safety guardrails (8) are installed on both sides of the support platform (7) of the first-stage sedimentation tank (3), and a ladder (1) is installed on the outer wall of the first-stage sedimentation tank (3).

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