Multi-stage sewage treatment tank

Abstract

The utility model discloses a multi-stage sewage treatment tank which comprises a main tank, a first-stage enclosure and a second-stage enclosure, an inner tank cavity and a plurality of sub tank cavities are separated, a sewage one-way circulation structure is arranged among the sub tank cavities, the first-end sub tank cavity is connected with a sewage inlet pipe, the tail-end sub tank cavity is connected with the inner tank cavity through a standby pumping pipeline, and the inner tank cavity is connected with a purified water outlet pipe. The sub-tank cavity at least comprises a primary sedimentation tank, an aerobic reaction tank and the like, and the inner tank cavity is provided with a deep treatment tank. The secondary sedimentation tank is provided with a sludge hopper, the aerobic and anoxic reaction tanks are provided with stirring devices, and the aerobic tank is provided with an aeration device. The main body pool can be rectangular or annular, and the inner pool cavity is consistent with the main body pool in shape and is reduced in equal proportion. The sewage treatment tank is small in occupied area, compact in structure, convenient to maintain, capable of achieving sewage staged treatment and efficiently removing organic matter, suspended solids and nitrogen and phosphorus nutrient substances, capable of meeting the high requirement standard, convenient to configure an automatic control system and accurately controlling the treatment process, suitable for different sewage treatment requirements, especially suitable for urban sewage treatment, and wide in application prospect.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a multi-stage sewage treatment tank. Background Technology

[0002] As the core component of a wastewater treatment system, the design and function of the wastewater treatment tank play a decisive role in the overall system's efficiency and quality. Different types of wastewater require specific adjustments and optimizations to the treatment tank. Urban wastewater is characterized by its diverse composition, rich organic matter, high suspended solids content, and the presence of nitrogen, phosphorus nutrients, and pathogens. Specifically, urban wastewater contains organic matter such as food scraps, grease, and detergents; suspended solids such as silt and fibers; and pathogens such as bacteria and viruses. Nitrogen and phosphorus are key elements causing eutrophication of water bodies.

[0003] In past wastewater treatment practices, conventional wastewater treatment ponds typically relied on single treatment units. This approach resulted in relatively low treatment efficiency and an inability to effectively address the complex components contained in urban wastewater. Based on this, multiple wastewater treatment ponds have been connected in series to achieve tiered wastewater treatment. However, these multi-stage treatment ponds often lack systematic design, with insufficient connection between each treatment unit, leading to low treatment efficiency and unsatisfactory treatment results. Furthermore, they suffer from large footprints and high investment costs. During the treatment process, their removal efficiency for organic matter, suspended solids, and nitrogen and phosphorus nutrients is limited, making it difficult to meet the high requirements and stringent standards of current wastewater treatment.

[0004] Therefore, it is particularly important to develop a multi-stage sewage treatment plant that can efficiently treat urban sewage and remove organic matter, suspended solids, and nitrogen and phosphorus nutrients. Summary of the Invention

[0005] The technical problem solved by this utility model is to provide a multi-stage sewage treatment tank, which can be used as a biochemical treatment system in commonly used sewage treatment systems in the prior art. It has a small footprint and is easy to use and maintain, and can solve the defects in the above-mentioned technical background.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a multi-stage sewage treatment tank, including a main tank and an annular primary enclosure set in the middle of the main tank. Several secondary enclosures are connected between the primary enclosure and the main tank wall. The primary enclosure and the secondary enclosures, together with the main tank wall, divide the main tank into an inner tank cavity in the middle and several sub-tank cavities evenly distributed around the inner tank cavity. A unidirectional sewage flow structure is provided between the annularly distributed sub-tank cavities. A sewage inlet pipe is connected to the sub-tank cavity at the beginning of the sewage flow direction, and the sub-tank cavity at the end of the sewage flow direction is connected to the inner tank cavity through a spare pumping pipeline. A clean water outlet pipe is connected to the inner tank cavity.

[0007] Preferably, the number of sub-chambers is not less than four, and includes at least one primary sedimentation tank, one aerobic reaction tank, one anoxic reaction tank and one secondary sedimentation tank. The sewage inlet pipe is connected to the primary sedimentation tank, the backup pumping pipeline is connected to the secondary sedimentation tank, and a deep treatment tank is provided in the inner chamber.

[0008] Preferably, the secondary sedimentation tank is equipped with a sludge hopper for cleaning, both the anoxic reaction tank and the aerobic reaction tank are equipped with a stirring device, and the aerobic reaction tank is equipped with an aeration device.

[0009] Preferably, the deep treatment tank is equipped with a deep treatment device, which includes one or a combination of activated carbon filter, sand filter, and membrane bioreactor.

[0010] Preferably, the volume ratio of the anoxic reaction tank to the aerobic reaction tank is 1:1.2 to 1:1.8.

[0011] Preferably, the height of the secondary enclosure decreases along the direction of sewage flow, and the flow structure is an overflow trough located at the top of the secondary enclosure.

[0012] Preferably, each of the sub-pool chambers is provided with a backup pumping pipeline communicating with the inner pool chamber, and each backup pumping pipeline is equipped with a valve body and a pumping device.

[0013] Preferably, the main pool wall is made of concrete, stainless steel or fiberglass, and the primary and secondary enclosures are made of fiberglass.

[0014] Preferably, the volume ratio of the inner pool cavity to all the sub-pool cavities is 1:3 to 1:5, and the secondary enclosure adopts an adjustable design, which can adjust the size of the sub-pool cavity by changing the position and number of the secondary enclosure.

[0015] Preferably, the main pool is rectangular or annular, and the inner pool cavity is the same shape as the main pool. The inner pool cavity is formed by proportionally reducing the main pool.

[0016] This utility model provides a multi-stage sewage treatment tank, which has the following beneficial effects.

[0017] This utility model's multi-stage wastewater treatment tank occupies a small area, has a compact structure, and facilitates functional layout, installation, and maintenance. Through rational layout and design, it achieves graded treatment of wastewater, effectively improving treatment efficiency. Multi-stage treatment efficiently removes organic matter, suspended solids, and nitrogen and phosphorus nutrients from wastewater, meeting the high requirements and stringent standards of current wastewater treatment. Simultaneously, it facilitates the configuration of an automatic control system for precise control of the treatment process, improving treatment efficiency and stability. The technical solution of this utility model is applicable to various types of wastewater treatment needs, and is particularly suitable for urban wastewater treatment with complex wastewater compositions, possessing broad application prospects. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model.

[0020] Figure 2 This is a structural schematic diagram of Embodiment 2 of the present invention.

[0021] The components include: 1. Main tank wall; 2. Secondary sedimentation tank; 3. Overflow trough; 4. Primary sedimentation tank; 5. Sewage inlet pipe; 6. Primary enclosure; 7. Secondary enclosure; 8. Clean water outlet pipe; 9. Aerobic reaction tank; 10. Advanced treatment tank; 11. Anoxic reaction tank; 12. Backup pumping pipeline; 13. Anaerobic reaction tank. Detailed Implementation

[0022] See Figure 1 A preferred embodiment of a multi-stage sewage treatment tank is described, wherein the multi-stage sewage treatment tank of this embodiment serves as a sewage component in a sewage treatment unit of a commercial residential project in Hunan Province.

[0023] In this embodiment, the multi-stage sewage treatment tank includes a rectangular main tank body, which includes a main tank wall 1 constructed of cement, and the inner side of the main tank wall 1 is a main tank cavity that is also rectangular.

[0024] A primary enclosure 6 is formed in the middle of the main tank cavity. This primary enclosure 6 has a rectangular ring structure, dividing the main tank cavity into an inner rectangular inner tank cavity and an outer ring outer tank cavity. Furthermore, four secondary enclosures 7 are specially designed in the outer ring outer tank cavity area. These secondary enclosures 7 further subdivide the ring outer tank cavity into multiple sub-tank cavities with different functions. These sub-tank cavities, together with the rectangular inner tank cavity, constitute a multi-stage wastewater treatment unit. The height of the primary enclosure 6 is designed to be higher than all the secondary enclosures 7. In the four secondary enclosures 7 in the rectangular inner tank cavity area, starting from the secondary enclosure 7 at the two o'clock position, the height of each secondary enclosure 7 decreases sequentially. Each secondary enclosure 7 is equipped with an overflow trough 3 as an overflow structure, working in conjunction with the secondary enclosures 7 of different heights to ensure a smooth and continuous overflow system between the various sub-tank cavities in the rectangular inner tank cavity area.

[0025] In such Figure 1 In this embodiment, four sub-chambers are separated from the corresponding annular outer chamber area by four secondary enclosures 7, corresponding to the primary sedimentation tank 4, aerobic reaction tank 9, anoxic reaction tank 11, and secondary sedimentation tank 2, respectively. The primary sedimentation tank 4 is connected to a sewage inlet pipe 5. The corresponding sewage to be treated is sent to the primary sedimentation tank 4 through the sewage inlet pipe 5 after pretreatment by the sewage well and filter. The primary sedimentation tank 4 is used to remove large particulate suspended solids in the sewage and reduce the load on subsequent treatment units. The aerobic reaction tank 9 and the anoxic reaction tank 11 are biological reaction tanks. Biological packing materials can be set in the tanks to effectively remove organic matter, nitrogen, phosphorus and other nutrients in the sewage through the adsorption and degradation of microorganisms. The secondary sedimentation tank 2 is used to separate biological sludge in the effluent of the biological reaction tank to ensure the clarity of the effluent. Meanwhile, the inner pool cavity enclosed by the primary enclosure 6 is the deep treatment pool 10. The deep treatment pool 10 is connected to the secondary sedimentation tank 2 through a pumping pipeline, so that the sewage treated by the secondary sedimentation tank 2 can be sent to the deep treatment pool 10 for further treatment. The deep treatment pool 10 is equipped with a deep treatment device, which in different embodiments can be one or a combination of activated carbon filter, sand filter, and membrane bioreactor. It can be used to further remove small suspended solids, colloidal substances and residual nutrients in the sewage, and improve the effluent quality of the purified water outlet pipe 8 connected to the deep treatment pool 10.

[0026] In this system, wastewater overflows from one sub-chamber to the next in a predetermined sequence. Through the progressive flow of wastewater within the main tank, it passes through each sub-chamber in turn, achieving the step-by-step removal of organic matter, suspended solids, and nitrogen and phosphorus nutrients, until finally flowing into the inner tank for further treatment. To ensure smooth and efficient flow of wastewater between the sub-chambers, a pumping pipeline is specially installed between the last sub-chamber and the inner tank to ensure continuous wastewater transport.

[0027] Furthermore, to improve the efficiency and flexibility of wastewater treatment, each sub-chamber of the annular outer chamber is equipped with a backup pumping line 12 connected to the inner chamber. These backup pumping lines 12 are equipped with flow controllers and valves, which can be quickly activated when needed to efficiently transport wastewater from the sub-chambers to the inner chamber for further treatment. This facilitates the regulation of wastewater flow and treatment efficiency, while also simplifying maintenance and repair. This design not only improves the efficiency of wastewater treatment but also significantly enhances the flexibility and reliability of the entire wastewater treatment system.

[0028] In this embodiment, the multi-stage sewage treatment tank has a compact design, occupies a small area, and is closely connected to each sub-tank, which can effectively improve the efficiency and effect of sewage treatment and meet the high requirements and strict standards of current sewage treatment.

[0029] exist Figure 2 In another embodiment shown, a multi-stage wastewater treatment tank and Figure 1 The main difference in the first embodiment shown is that the main pool wall 1 is made of fiberglass, and the primary enclosure 6 and the secondary enclosure 7 are also made of fiberglass, which makes it particularly suitable for the molding requirements of small-sized processing systems.

[0030] Meanwhile, the main tank wall 1 encloses a circular tank, and the primary enclosure 6 is a concentric annular enclosure, similarly dividing the main tank cavity into an inner circular cavity and an outer annular cavity. Within the outer annular cavity, five secondary enclosures 7 are installed, dividing it into five sub-cavities with different functions. These sub-cavities, together with the inner circular cavity, constitute another multi-stage wastewater treatment unit. Similar to the first embodiment, each secondary enclosure 7 is also equipped with an overflow trough 3 as an overflow structure to ensure smooth and continuous flow of wastewater between the sub-cavities.

[0031] In this embodiment, the five sub-chambers on the annular outer chamber correspond to the primary sedimentation tank 4, aerobic reaction tank 9, anoxic reaction tank 11, secondary sedimentation tank 2, and anaerobic reaction tank 13, respectively. The functions of the primary sedimentation tank 4, aerobic reaction tank 9, anoxic reaction tank 11, and secondary sedimentation tank 2 are the same as in the first embodiment, while the anaerobic reaction tank 13 is used to further remove organic matter from the wastewater under anoxic conditions through the action of anaerobic microorganisms, and to produce usable resources such as biogas. Similarly, in this embodiment, the wastewater flows sequentially between the various sub-chambers in a predetermined order, achieving the step-by-step removal of organic matter, suspended solids, and nitrogen and phosphorus nutrients from the wastewater. Finally, after further treatment in the advanced treatment tank 10, the wastewater meets the effluent quality standards and is discharged through the additionally installed purified water outlet pipe 8.

[0032] This embodiment of the multi-stage wastewater treatment tank also boasts advantages such as compact structure, small footprint, and high treatment efficiency. Furthermore, the use of fiberglass construction makes the entire treatment system lighter, more corrosion-resistant, and particularly suitable for on-site construction in complex environments.

[0033] To optimize the treatment effect of the tanks, the dimensions of each sub-tank in the deep treatment tank 10 and the annular outer tank need to be controlled. Specifically, the volume ratio of the inner tank to the annular outer tank in the main tank is 1:3 to 1:5, while the volume ratio of the anoxic reaction tank 11 to the aerobic reaction tank 10 is 1:1.2 to 1:1.8. This ensures that the wastewater can stay in each sub-tank for a sufficient time during the treatment process, thereby making full contact with the biological packing material and improving the adsorption and degradation efficiency of microorganisms.

[0034] Furthermore, in another embodiment, considering the flexibility and adjustability in actual operation:

[0035] By adopting an adjustable two-stage enclosure design, users can flexibly adjust the size and layout of each sub-chamber according to actual treatment needs to adapt to different types of wastewater and different treatment scales.

[0036] Primary sedimentation tank 4 and secondary sedimentation tank 2 need to be designed with large volumes and suitable sludge hopper structures to facilitate sedimentation and separation of suspended solids.

[0037] The aerobic reaction tank 9 and the anoxic reaction tank 11 require a reasonable aeration and stirring device to ensure the normal growth and metabolic activities of microorganisms.

[0038] In addition, the size of the anaerobic reactor 13 also needs to be specially designed according to the requirements of the treatment process in order to achieve the best organic matter removal effect.

Claims

1. A multi-stage sewage treatment tank, characterized in that: The main pool includes a ring-shaped primary enclosure (6) located in the middle of the main pool. The primary enclosure (6) is connected to the main pool wall (1) of the main pool by several secondary enclosures (7). The primary enclosure (6) and the secondary enclosure (7) and the main pool wall (1) divide the main pool into an inner pool cavity in the middle and several sub-pool cavities evenly distributed around the inner pool cavity. A flow structure for unidirectional sewage flow is provided between the sub-pool cavities distributed in a ring. A sewage inlet pipe (5) is connected to the sub-pool cavity at the beginning of the sewage flow direction. The sub-pool cavity at the end of the sewage flow direction is connected to the inner pool cavity through a spare pumping pipe (12). A clean water outlet pipe (8) is connected to the inner pool cavity.

2. The multi-stage sewage treatment tank as described in claim 1, characterized in that: The number of sub-chambers is not less than four, and includes at least one primary sedimentation tank (4), one aerobic reaction tank (9), one anoxic reaction tank (11), and one secondary sedimentation tank (2). The sewage inlet pipe (5) is connected to the primary sedimentation tank (4), the backup pumping pipeline (12) is connected to the secondary sedimentation tank (2), and a deep treatment tank (10) is provided in the inner chamber.

3. The multi-stage sewage treatment tank as described in claim 2, characterized in that: The secondary sedimentation tank (2) is equipped with a sludge hopper for cleaning. Both the anoxic reaction tank (11) and the aerobic reaction tank (9) are equipped with stirring devices. The aerobic reaction tank (9) is equipped with an aeration device.

4. The multi-stage sewage treatment tank as described in claim 2, characterized in that: The deep treatment tank (10) is equipped with a deep treatment device, which includes one or a combination of activated carbon filter, sand filter, and membrane bioreactor.

5. A multi-stage wastewater treatment tank as described in claim 2 or 3, characterized in that: The volume ratio of the anoxic reaction tank (11) to the aerobic reaction tank (9) is 1:1.2 to 1:1.

8.

6. The multi-stage sewage treatment tank as described in claim 1, characterized in that: The height of the secondary enclosure (7) decreases along the direction of sewage flow, and the flow structure is an overflow trough (3) set on the top of the secondary enclosure (7).

7. The multi-stage sewage treatment tank as described in claim 1, characterized in that: Each of the sub-pool chambers is provided with a backup pumping pipeline (12) that communicates with the inner pool chamber. Each backup pumping pipeline (12) is equipped with a valve body and a pumping device.

8. The multi-stage sewage treatment tank as described in claim 1, characterized in that: The main pool wall (1) is made of concrete, stainless steel or fiberglass, and the primary enclosure (6) and secondary enclosure (7) are made of fiberglass.

9. The multi-stage sewage treatment tank as described in claim 1, characterized in that: The volume ratio of the inner pool cavity to all the sub-pool cavities is 1:3 to 1:

5. The secondary enclosure (7) adopts an adjustable design, which can adjust the size of the sub-pool cavity by changing the position and number of the secondary enclosure (7).

10. The multi-stage sewage treatment tank as described in claim 1, characterized in that: The main pool is rectangular or annular in shape, and the inner pool cavity is the same shape as the main pool. The inner pool cavity is formed by proportionally reducing the main pool according to a certain ratio.

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