A high-efficiency sedimentation tank modified in-situ from a sludge concentration tank

Abstract

This utility model belongs to the field of wastewater treatment technology and discloses a high-efficiency sedimentation tank that is converted from an in-situ sludge thickening tank. This utility model utilizes the original sludge thickening tank body and scraper, adding a mixing tank and a flocculation tank upstream, and adding a central guide tube, inclined tube packing assembly, and effluent weir inside the tank body. The inclined tube packing assembly includes inclined tube packing and inclined tube supports. Wastewater after mixing and flocculation enters the tank body through the central guide tube, achieving efficient solid-liquid separation in the inclined tube packing area. The supernatant is discharged through the effluent weir, and the sludge is collected by the scraper. This utility model makes full use of existing facilities, has low conversion costs, requires no new land use, and can significantly improve effluent quality, possessing strong economic and practical advantages.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a high-efficiency sedimentation tank that is an in-situ modified sludge thickening tank. Background Technology

[0002] As environmental regulations impose increasingly stringent requirements on wastewater treatment plant effluent standards, particularly tightening limits for suspended solids (SS) and total phosphorus (TP), traditional wastewater treatment processes face immense pressure to upgrade and modernize. Upgrades to wastewater treatment plants are generally constrained by limited site resources and the need to ensure continuous production. Therefore, how to economically and efficiently increase treatment capacity without acquiring new land has become a significant technical challenge within the industry.

[0003] like Figure 1 and Figure 2 As shown, sludge thickening tanks are common structures in wastewater treatment plants. Their main function is to reduce the volume of sludge through gravity settling. However, they have a large footprint, low hydraulic load, and low treatment efficiency, making them unsuitable for deep wastewater purification. High-efficiency sedimentation tanks, by incorporating functional zones for mixing, flocculation, and inclined tube sedimentation, can achieve extremely high solid-liquid separation efficiency, with suspended solids (SS) removal rates exceeding 90%. This is a crucial technical means to meet stringent emission standards.

[0004] Therefore, transforming idle or inefficient sludge thickening tanks into high-efficiency sedimentation tanks on-site can not only revitalize existing assets and save a lot of civil engineering investment and land resources, but also quickly respond to the needs of upgrading and transformation, resulting in significant economic and environmental benefits. Utility Model Content

[0005] This invention aims to at least partially solve the problem of wastewater treatment plant upgrading and renovation being limited by site and cost in the existing technology, and provides a high-efficiency sedimentation tank that is converted from a sludge thickening tank in situ, so as to achieve the greatest efficiency improvement with the least renovation cost.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A high-efficiency sedimentation tank, converted from an in-situ sludge thickening tank, includes: a tank body, which is an in-situ reused sludge thickening tank body; a mixing tank and a flocculation tank located upstream of the tank body and connected to its influent system; a central guide tube located inside the tank body, the inlet of which is connected to the outlet of the flocculation tank; an inclined tube packing assembly installed inside the tank body and surrounding the outside of the central guide tube, the inclined tube packing assembly including inclined tube packing and inclined tube supports for supporting the inclined tube packing; an effluent weir located above the inclined tube packing for collecting the supernatant after sedimentation; and a sludge scraper located at the bottom of the tank body for collecting settled sludge.

[0008] Preferably, the inclined tube support is a steel composite structure, comprising: a main frame beam fixed to the inner wall of the pool; secondary beams connected to the main frame beams; and a flat steel reinforcement support structure laid on the secondary beams for directly supporting the inclined tube packing. This layered support structure ensures the stability and load-bearing capacity of the inclined tube packing assembly.

[0009] Preferably, one end of the outlet weir is fixedly connected to the outer wall of the central guide tube, and the other end is fixedly connected to the existing outlet channel of the pool. This fixing method provides structural stability and effectively utilizes existing facilities.

[0010] Preferably, the wall thickness of the central guide tube is reinforced to bear the load generated by the outlet weir and ensure the safety of the overall structure.

[0011] Preferably, the mixing tank and the flocculation tank are respectively equipped with a mixing agitator and a flocculation agitator to ensure that the reagent and the sewage are fully mixed and reacted to form ideal flocs.

[0012] Preferably, the bottom of the pool is provided with a sludge discharge pipe, and an electromagnetic flow meter is installed on the sludge discharge pipe to achieve precise control of the sludge discharge volume.

[0013] Preferably, the sludge scraper is an in-situ reuse sludge thickening tank scraper, and its rotation speed has been adapted to meet the sludge discharge requirements of the high-efficiency sedimentation tank, further reducing the renovation cost.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention makes full use of the existing thickening tank, sludge scraper and other facilities, and only adds a mixing and flocculation zone and internal components, which greatly saves on civil engineering investment and equipment procurement costs, and does not require additional construction land.

[0016] This utility model has a high sedimentation tank treatment efficiency and good effluent quality: by adding a mixing flocculation reaction zone and inclined tube packing, the traditional gravity sedimentation tank is transformed into a high-efficiency sedimentation tank, which significantly improves the surface hydraulic load and has excellent removal effect on SS and TP, and can stably meet the stringent effluent standards. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a single sludge thickening tank before the renovation.

[0018] Figure 2 This is a top view of a single sludge thickening tank before the renovation.

[0019] Figure 3 This is a schematic diagram of the structure of a single high-efficiency sedimentation tank in an embodiment of this utility model.

[0020] Figure 4 This is a top view of a single high-efficiency sedimentation tank in an embodiment of this utility model.

[0021] Figure 5 This is a schematic diagram of the planar structure of the inclined tube packing support in an embodiment of this utility model.

[0022] The markings in the diagram are: 1-pool body, 2-inclined tube packing, 3-outlet weir, 4-central guide tube, 5-sludge scraper, 6-outlet, 7-inclined tube support. Detailed Implementation

[0023] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings herein can generally be arranged and designed in various different configurations.

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 3 , Figure 4 and Figure 5 As shown, this embodiment provides a high-efficiency sedimentation tank that is modified from an in-situ sludge thickening tank. The modification scheme retains and utilizes the original sludge thickening tank body 1 as the main reaction zone.

[0026] During the renovation, a separate mixing tank and flocculation tank (not shown in the figure) were first constructed upstream of tank 1. After the raw water enters the mixing tank, coagulants such as PAC are added, and the mixture is rapidly mixed under the action of a mixing agitator. Then, the water enters the flocculation tank, where coagulants such as PAM are added, and dense large flocs are formed under the slow stirring of a flocculation agitator.

[0027] The flocculated wastewater containing alum is introduced into the central guide tube 4 at the center of the tank 1 through a pipe. Guided by the guide tube 4, the water flows downward, then spreads evenly from the bottom of the guide tube 4 to the surrounding areas, and flows upward, entering the area of ​​the inclined tube packing 2 surrounding the outside of the guide tube 4.

[0028] The inclined tube packing 2 is arranged at an angle, which greatly increases the sedimentation area and shortens the settling distance of the particles. Suspended solids such as flocs settle rapidly in the inclined tubes and slide down the inclined tube wall to the bottom of the tank 1. The sludge that settles to the bottom of the tank is slowly scraped to the central sludge hopper by a sludge scraper 5 with its rotation speed adjusted and reused in situ. It is then discharged through the sludge discharge pipeline and pump. The sludge discharge pipeline is equipped with an electromagnetic flow meter to achieve quantitative sludge discharge.

[0029] The clear supernatant continues to rise and overflows from the top of the inclined tube packing 2, and is collected through the evenly arranged effluent weirs 3. In this embodiment, four effluent weirs 3 are added, one end of which is fixed to the outer wall of the thickened central guide tube 4, and the other end is connected to the original effluent channel of the pool body 1, ensuring the uniformity of the effluent and the stability of the structure. The collected supernatant is discharged to the next treatment unit through the outlet 6.

[0030] The inclined tube packing 2 is securely mounted on a specially designed inclined tube support 7. For example... Figure 5 As shown, the inclined tube support 7 is constructed using a combination of H-beams, channel steel, and flat steel. The bottommost frame beam is fixed at both ends to the inner wall of the pool 1, forming the main load-bearing structure; the secondary beams in the middle layer are welded to the main beam, forming a secondary support; and the topmost layer is a grid-like auxiliary support structure formed by densely packed flat steel in the warp and weft directions, directly supporting the inclined tube packing 2 and ensuring its safety and stability.

[0031] Through the above modifications, the original sludge thickening tank was successfully transformed into a high-efficiency sedimentation tank integrating mixing, flocculation, sedimentation, thickening, and sludge-water separation, with a surface hydraulic load of up to 4.87m. 3 / (m 2 •h) can efficiently remove SS and TP, ensuring that the effluent quality meets the upgraded discharge requirements.

[0032] This utility model is not limited to the above-mentioned optional embodiments. Anyone can derive other forms of products under the guidance of this utility model. However, regardless of any changes made in its shape or structure, any technical solution that falls within the scope of the claims of this utility model shall be protected by this utility model.

Claims

1. A high-efficiency sedimentation tank converted from an in-situ sludge thickening tank, characterized in that, include: Pool body (1), wherein the pool body (1) is an in-situ reuse sludge thickening pool body; A mixing tank and a flocculation tank are located upstream of the pool body (1) and connected to its water inlet system; A central guide tube (4) is installed inside the pool body (1), and the inlet of the central guide tube (4) is connected to the outlet of the flocculation pool; An inclined tube packing assembly is installed inside the pool body (1) and surrounds the outside of the central guide tube (4). The inclined tube packing assembly includes an inclined tube packing (2) and an inclined tube support (7) for supporting the inclined tube packing (2). The outlet weir (3) is set at the top of the inclined tube packing (2) and is used to collect the supernatant after sedimentation. A sludge scraper (5) is installed at the bottom of the pool (1) to collect settled sludge.

2. The high-efficiency sedimentation tank, which is a sludge thickening tank modified in situ according to claim 1, is characterized in that, The inclined tube support (7) is a steel composite structure, including: The main frame beam is fixed to the inner wall of the pool body (1); Secondary beams connected to the main beams of the frame; The flat steel reinforcement structure laid on the secondary beam is used to directly support the inclined tube filler (2).

3. A high-efficiency sedimentation tank modified from a sludge thickening tank in situ, as described in claim 1, is characterized in that... One end of the outlet weir (3) is fixedly connected to the outer wall of the central guide tube (4), and the other end is fixedly connected to the original outlet channel of the pool body (1).

4. A high-efficiency sedimentation tank modified from a sludge thickening tank in situ, as described in claim 3, is characterized in that... The wall thickness of the central guide tube (4) is reinforced to bear the load generated by the outlet weir (3).

5. A high-efficiency sedimentation tank modified from a sludge thickening tank in situ, as described in claim 1, is characterized in that... The mixing tank and the flocculation tank are respectively equipped with a mixing agitator and a flocculation agitator.

6. A high-efficiency sedimentation tank converted from a sludge thickening tank in situ, as described in claim 1, is characterized in that... The bottom of the pool (1) is provided with a sludge discharge pipe, and an electromagnetic flow meter is installed on the sludge discharge pipe.

7. A high-efficiency sedimentation tank converted from a sludge thickening tank in situ, as described in claim 1, is characterized in that... The sludge scraper (5) is an in-situ sludge thickening tank scraper.

Images