A layout structure of a three-stage sedimentation tank and its ancillary facilities
By constructing an auxiliary building above the tertiary sedimentation tank and installing a suspended crane and sludge dewatering equipment, the problems of large footprint and inconvenient material flow of the tertiary sedimentation tank facility were solved, achieving a compact layout and convenient maintenance of the facility.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA LIGHT IND NANNING DESIGN ENG
- Filing Date
- 2025-06-19
- Publication Date
- 2026-06-30
Smart Images
Figure CN224430330U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sewage treatment building technology, specifically to a three-stage sedimentation tank and its auxiliary facilities layout structure. Background Technology
[0002] Wastewater treatment plants are essential infrastructure in urban construction. The tertiary sedimentation tank is a commonly used sedimentation stage in advanced treatment. The tertiary sedimentation tank is a relatively final stage of wastewater treatment. Its conventional facility is semi-buried (2-3 meters deep, 1-2 meters above ground). The tertiary sedimentation tank and its ancillary buildings are usually built separately, requiring two separate land resources. However, based on the applicant's previous patent technology, an improvement has been made: a three-dimensional combined building structure of tertiary sedimentation tank and ancillary buildings; application number: CN202120726640.6. The ancillary buildings are built above the tertiary sedimentation tank, which has achieved many advantages: reducing the land area occupied by the tertiary sedimentation tank and its ancillary buildings, and facilitating the maintenance, inspection and monitoring of the tertiary sedimentation tank and its ancillary equipment by staff.
[0003] However, based on the existing technology, how can the tertiary sedimentation tank and its auxiliary buildings and equipment be arranged more rationally, and how can the processes of flocculation dosing and sludge treatment in the tertiary sedimentation tank be made more convenient and the material flow smoother? Those skilled in the art still need to conduct more in-depth design and improvement on the layout and material flow of the tertiary sedimentation tank and its auxiliary equipment. Summary of the Invention
[0004] The purpose of this utility model is to provide a layout structure for a tertiary sedimentation tank and its ancillary facilities. It makes full use of the second-floor ancillary building above the tertiary sedimentation tank to arrange sludge dewatering equipment and flocculation dosing equipment. Several suspended cranes are set under the top slab of the elevated floor to assist in flocculation dosing and sludge dewatering operations. The entire facility is compact and reasonable, and the material flow is smooth and convenient.
[0005] To achieve the above objectives, the technical solution of this utility model is as follows:
[0006] A three-stage sedimentation tank and its ancillary facilities are arranged in a structure. The three-stage sedimentation tank is partially buried in the ground. The individual tanks are separated by partition walls. The space above the tanks is an elevated floor for ancillary rooms. A sludge scraper is installed at the bottom of the three-stage sedimentation tank. A sludge discharge hopper is installed at the end of the sludge scraper. The sludge discharge hopper is connected to a sludge discharge well on one side of the tank through a pipe. A sludge pump is installed at the bottom of the sludge discharge well. The outlet of the sludge pump is connected to a screw press on the elevated floor through a sludge lifting pipe. The outlet of the screw press is connected to a screw conveyor pipe. The outlet of the screw conveyor pipe extends to a sludge tank on the ground on one side of the elevated floor.
[0007] A sludge scraper is installed at the bottom of the triple sedimentation tank, with a sludge discharge hopper at its endpoint. The hopper is connected to a sludge discharge well on one side of the tank via a pipe. The scraper reciprocates at the bottom of the tank, scraping the settled sludge towards the funnel-shaped sludge discharge hopper, which then enters the discharge pipe and exits through the discharge well. Once the sludge reaches a certain height in the discharge well, the sludge pump is activated, transporting the sludge to a disc screw sludge dewatering machine in the overhead layer. The sludge enters the screw cavity through the inlet, and the pitch of the screw shaft gradually decreases, as does the gap between the rings. The volume of the screw cavity continuously shrinks, and under the continuous rotation of the screw drive shaft, the water in the sludge is squeezed out, and the solids content of the filter cake continuously increases, ultimately achieving continuous dewatering of the sludge. The sludge is continuously discharged from the outlet to an auger conveyor pipe, which then sends the dried sludge into a sludge tank for collection and transfer.
[0008] The elevated floor is also equipped with a PAC dosing device. The output port of the PAC dosing device is connected to a vertical dosing pipe, and the end of the dosing pipe is connected to the tertiary sedimentation tank.
[0009] PAC dosing equipment is a polyaluminum chloride flocculant dosing system. PAC dosing devices manufactured by Chengdu Xinyuan Environmental Protection Equipment Co., Ltd. can be used. The PAC dosing device consists of a dosing tank, mixer, metering pump, valves, back pressure valve, buffer, backwasher, pressure gauge, Y-type filter, pipe fittings, valves, and control cabinet, all mounted on a base platform. Solid flocculant is added to the dissolving tank, and then tap water is added in proportion and stirred to dissolve. The metering pump accurately adds the PAC to the water treatment system. PAC forms positively charged aluminum ions in water. These aluminum ions attract negatively charged suspended particles in the water, causing them to aggregate and form larger flocs, which then settle, thus purifying the water.
[0010] Several suspended cranes are installed on the top slab of the elevated floor, with their travel tracks parallel to the auger conveying pipe; the elevated floor is divided into a flocculation dosing room, a blower room, and a sludge dewatering room, with each room corresponding to a set of suspended cranes.
[0011] The travel track of the suspended crane extends from both ends through the exterior wall window sashes to the edge of the elevated floor.
[0012] The suspended crane in the flocculation dosing room can be used for equipment material addition operations and equipment maintenance. When the crane travels to the extension section, the flocculated material can be lifted directly from the first floor through the window and into the flocculation dosing room. The suspended crane in the blower room can be used for equipment maintenance and spare parts replacement. When the crane travels to the extension section, spare parts can be lifted directly from the first floor through the window and into the blower room. The suspended crane in the sludge dewatering room is used for equipment maintenance. When the crane travels to the extension section, the sludge tank can be lifted with a wire rope to the height above the truck bed. The sludge tank can be a bottom-opening type. The bottom plate of the sludge tank can be manually opened to pour the dried sludge into the truck bed.
[0013] The front section of the auger conveying pipe is a closed circular pipe section with a feeding auger inside, driven by a motor at the pipe head end; the rear section of the auger conveying pipe is a closed square pipe section that slopes downwards.
[0014] Advantages of this utility model:
[0015] (1) In this utility model, sludge dewatering treatment and PAC dosing are both carried out above the three sedimentation tank. The distance from the three sedimentation tank is close, the construction cost of the conveying pipeline is low, and the staff can observe the situation of the three sedimentation tank below from the overhead layer above the three sedimentation tank, and observe the operation of the overhead layer equipment at the same time, making monitoring convenient.
[0016] (2) This utility model utilizes a suspended crane with an extension section, which not only facilitates the maintenance of equipment in the elevated floor, but also facilitates the transportation of materials from outside the building into the elevated floor.
[0017] (3) This utility model utilizes a suspended crane with an extension section to lift and unload the sludge tank on the side of the three sedimentation tank without the need for other equipment to assist in loading. Attached Figure Description
[0018] Figure 1 This is a floor plan of the elevated ground floor.
[0019] Figure 2 This is a plan view of the overhead cranes suspended in the elevated floor area.
[0020] Figure 3 This is a plan view of the three sedimentation tanks;
[0021] Figure 4 This is a cross-sectional view of the overhead floor at the screw press location;
[0022] Figure 5 Cross-sectional view of the overhead floor at the PAC dosing equipment location;
[0023] The components in the diagram are labeled as follows: 1-Tertiary sedimentation tank; 11-Sludge hopper; 12-Sludge pipe; 2-Sludge well; 21-Sludge pump; 22-Sludge lifting pipe; 3-Screw press; 31-Screw conveyor pipe; 32-Sludge tank; 4-Suspended crane; 5-PAC dosing equipment; 51-Dosing pipe. Detailed Implementation
[0024] Example 1
[0025] A three-stage sedimentation tank and its ancillary facilities are arranged in a structure. The three-stage sedimentation tank 1 is partially buried in the ground. The individual tanks are separated by partition walls 12. The space above the tanks is an elevated floor for ancillary rooms. A sludge scraper is installed at the bottom of the three-stage sedimentation tank 1. A sludge discharge hopper is installed at the end of the sludge scraper. The sludge discharge hopper is connected to a sludge discharge well 3 on one side of the tank through a pipe. A sludge pump 21 is installed at the bottom of the sludge discharge well 3. The outlet of the sludge pump 21 is connected to two screw presses 3 on the elevated floor through a sludge lifting pipe 22. The outlet of the screw presses 3 is connected to an auger conveying pipe 31. The outlet of the auger conveying pipe 31 extends to a sludge box 32 on the ground on one side of the elevated floor.
[0026] The elevated floor is also equipped with a PAC dosing device 5. The output port of the PAC dosing device 5 is connected to a vertical dosing pipe 51, and the end of the dosing pipe 51 is connected to the tertiary sedimentation tank 1.
[0027] Several suspended cranes 4 are installed on the top slab of the elevated floor, and their travel track is parallel to the auger conveying pipe 31. The elevated floor is divided into a flocculation dosing room, a blower room and a sludge dewatering room, with each room corresponding to a set of suspended cranes 4.
[0028] The travel track of the suspended crane 4 extends out of the edge of the elevated floor at both ends.
[0029] The front section of the auger conveying pipe 31 is a closed circular pipe section with a feeding auger installed inside, driven by a motor at the pipe head end; the rear section of the auger conveying pipe 31 is a closed square pipe section that slopes downwards.
Claims
1. A three-stage sedimentation tank and its ancillary facilities arrangement structure, wherein the three-stage sedimentation tank (1) is partially buried in the ground, and the individual tanks are separated by partition walls (12), the space above the tanks is an elevated floor for ancillary rooms, a sludge scraper is installed at the bottom of the three-stage sedimentation tank (1), and a sludge discharge hopper is installed at the end point of the sludge scraper, and the sludge discharge hopper is connected to a sludge discharge well (3) on one side of the tank through a pipe, characterized in that: A sludge pump (21) is installed at the bottom of the sludge discharge well (3). The outlet of the sludge pump (21) is connected to the screw press (3) on the overhead floor through the sludge lifting pipe (22). The outlet of the screw press (3) is connected to the auger conveying pipe (31). The outlet of the auger conveying pipe (31) extends to the sludge box (32) on the ground on one side of the overhead floor.
2. The arrangement structure of the three sedimentation tank and its ancillary facilities according to claim 1, characterized in that: The elevated floor is also equipped with a PAC dosing device (5), the output port of which is connected to a vertical dosing pipe (51), and the end of the dosing pipe (51) is connected to a tertiary sedimentation tank (1).
3. The arrangement structure of the three sedimentation tank and its ancillary facilities according to claim 1, characterized in that: Several suspended cranes (4) are installed on the top plate of the elevated floor, and their travel track direction is parallel to the auger conveying pipe (31). The elevated floor is divided into a flocculation dosing room, a blower room and a sludge dewatering room, and each room corresponds to a set of suspended cranes (4).
4. The arrangement structure of the three sedimentation tanks and their ancillary facilities according to claim 3, characterized in that: The travel track of the suspended crane (4) extends out of the edge of the overhead floor at both ends.
5. The arrangement structure of the three sedimentation tanks and their ancillary facilities according to claim 1, characterized in that: The front section of the auger conveying pipe (31) is a closed circular pipe section with a feeding auger installed in the inner cavity, driven by a motor at the pipe head end; the rear section of the auger conveying pipe (31) is a closed square pipe section that slopes downward.