Intensive in-situ expansion biochemical system
By setting up anoxic, aerobic, and sedimentation zones within the biological treatment tank, and employing MBBR suspended packing material and mixed liquor distributors to form a high-density sludge filtration layer, the problem of overloaded operation of wastewater treatment plants is solved, achieving efficient and land-saving wastewater treatment results.
Patent Information
- Application Number
- CN202422850924.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-21
AI Technical Summary
Existing wastewater treatment plants, facing overload operation, are difficult to upgrade and renovate by building new or expanding biological treatment tanks and secondary sedimentation tanks due to land and funding constraints.
Design an intensive in-situ expansion biochemical system that uses partition walls and screens to divide the biochemical tank into anoxic, aerobic, and sedimentation zones. Use MBBR suspended packing and mixed liquor distributor to form a high-density sludge filter layer to achieve efficient wastewater treatment.
It improves wastewater treatment efficiency, shortens system retention time, reduces floor space, prevents microbial loss, and enhances effluent quality.
Smart Images
Figure CN223480932U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sewage treatment plant upgrade and expansion technology, specifically to an intensive in-situ expansion biochemical system. Background Technology
[0002] With the rapid development of cities and towns across my country, the amount of sewage requiring treatment at wastewater treatment plants is increasing. Coupled with the rise in industrial wastewater, many existing wastewater treatment plants are operating beyond their design capacity in terms of influent quality and quantity. However, due to land use restrictions and funding limitations, the construction and expansion of many wastewater treatment plants are constrained.
[0003] Most existing technologies involve constructing new biological treatment tanks and secondary sedimentation tanks, primarily for existing wastewater treatment plants with reserved land. Upgrading these plants involves expanding the biological treatment tanks and secondary sedimentation tanks to extend the sludge age, thereby completing nitrification and denitrification reactions. This method is only suitable for water plants with ample land and sufficient funds. Summary of the Invention
[0004] This invention addresses the shortcomings of existing technologies by providing an intensive in-situ expansion biochemical system that can upgrade existing biochemical tanks without constructing a new secondary sedimentation tank, while still meeting the existing water quality and quantity requirements for wastewater treatment plant influent.
[0005] To achieve the above objectives, this utility model designs an intensive in-situ expansion biochemical system, including a biochemical tank. The tank is divided into sequentially connected anoxic, aerobic, and sedimentation zones by partition walls and screens. A connecting pipe is located at the top of each partition wall. Suspended packing material is located in the aerobic zone, and a sedimentation tank is located in the sedimentation zone. The sedimentation tank consists of a lower conical tank and an upper square tank. A mixed liquor distributor is located at the bottom inlet of the conical tank, and an outlet weir is located at the top of the inner wall of the square tank. During the ascent of wastewater within the sedimentation tank, the continuously expanding cross-sectional area of the conical tank, combined with gravity, causes the activated sludge particles in the wastewater to gradually slow down until they come to rest, thus forming a high-density sludge filter layer.
[0006] Preferably, a sludge pump is provided above the mixed liquid distributor, and the sludge pump is connected to a sludge discharge pipe.
[0007] Preferably, the sludge discharge pipe is connected to a sludge discharge pipe and a sludge return pipe, with the other end of the sludge return pipe connected to an anoxic zone. After sludge-water separation, the supernatant at the top of the sedimentation tank is discharged through the effluent weir, while the activated sludge settles to the bottom of the sedimentation tank. Through the sludge lift pump, a portion of the sludge is returned to the anoxic zone via the sludge return pipe for denitrification, while the excess sludge is discharged through the sludge discharge pipe.
[0008] Preferably, the bottom region of the square tank is provided with an inclined tube layer, which consists of multiple inclined pipes. This inclined tube layer serves to bio-flocculate and filter pollutants in the wastewater.
[0009] Preferably, a water inlet pipe is provided at the bottom of the sidewall of the anoxic zone.
[0010] Preferably, one or more stirrers are provided in the bottom region of the anoxic zone.
[0011] Preferably, the outlet weir is a triangular weir.
[0012] Preferably, both the aerobic zone and the sedimentation zone are equipped with aeration devices at their bottoms.
[0013] Preferably, the aeration device includes an aeration pipe that covers the bottom area of the aerobic zone and the sedimentation zone. Multiple aeration discs are evenly spaced on the aeration pipe, and multiple aeration holes are opened on the aeration discs.
[0014] Preferably, the suspended packing material is MBBR suspended packing material, and the diameter of the suspended packing material is larger than the screen aperture. By adding MBBR suspended packing material into the oxygen zone, compared with the activated sludge process, the effective biomass can be significantly increased, wastewater treatment efficiency can be improved, and the total system retention time can be shortened.
[0015] The beneficial effects of this utility model are:
[0016] 1. This utility model, by adding MBBR suspended packing material to the biological treatment tank, significantly increases the effective biomass and improves wastewater treatment efficiency compared to the activated sludge method. It also shortens the total retention time of the system. Due to the shortened retention time, the original tank volume can be used to build a sedimentation zone, eliminating the need to build a new secondary sedimentation tank and reducing the total land area of the system.
[0017] 2. This invention utilizes a mixed liquor distributor to cause wastewater to rise within the sedimentation tank. As the conical tank's cross-sectional area continuously expands, coupled with gravity, the activated sludge particles in the wastewater gradually slow down until they come to rest, forming a high-density sludge filter layer. This mechanical interception prevents the loss of microorganisms, maintaining a high sludge concentration in the biological reaction tank and thus reducing sludge load. The effluent flows upwards in a steady-state stream through the sludge filter layer, where organic matter undergoes further biological and filtration adsorption treatment, further degrading organic matter and suspended solids in the effluent and improving wastewater treatment quality. Attached Figure Description
[0018] Figure 1 It is a structural diagram of the utility model;
[0019] Figure 2 This is a top view of the present invention;
[0020] Figure label:
[0021] 1 partition wall, 11 connecting pipes
[0022] 2 sieves
[0023] 3. Oxygen-deficient zone, 31. Inlet pipe, 32. Agitator.
[0024] 4. Aerobic zone, 41. Aeration device, 411. Aeration pipe, 412. Aeration disc, 42. Suspended packing material.
[0025] 5. Sedimentation Zone
[0026] 6. Sedimentation tank, 61. Conical tank, 611. Mixed liquor distributor, 612. Sludge pump, 62. Square tank, 621. Effluent weir, 622. Inclined tube layer.
[0027] 7. Sludge discharge pipe, 71. Sludge discharge pipe, 72. Sludge return pipe,
[0028] 8. Sludge filtration layer. Detailed Implementation
[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.
[0030] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.
[0031] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.
[0033] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.
[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0035] Example
[0036] like Figures 1-2 The intensive in-situ expansion biochemical system shown includes a biochemical tank. The tank is divided into an anoxic zone 3, an aerobic zone 4, and a sedimentation zone 5 by partition walls 1 and screens 2, which are connected sequentially. A connecting pipe 11 is located at the top of partition wall 1, and an inlet pipe 31 is located at the bottom of the side wall of anoxic zone 3. Two agitators 32 are located at the bottom of anoxic zone 3. Suspended packing material 42, specifically MBBR suspended packing material, is located in aerobic zone 4, and its diameter is larger than the diameter of screen 2. Aeration devices 41 are located at the bottom of both aerobic zone 4 and sedimentation zone 5. Each aeration device 41 includes an aeration pipe 411, which covers the bottom areas of aerobic zone 4 and sedimentation zone 5. Multiple aeration discs 412 are evenly spaced along the aeration pipes 411, and each aeration disc 412 has multiple aeration holes. A sedimentation tank 6 is provided within the sedimentation zone 5. The sedimentation tank 6 consists of a lower conical tank 61 and an upper square tank 62 connected together. A mixed liquor distributor 611 is located at the bottom inlet of the conical tank 61. As the wastewater rises within the sedimentation tank 6, the cross-sectional area of the conical tank 61 continuously expands, and gravity causes the activated sludge particles in the wastewater to gradually slow down until they come to rest, thus forming a high-density sludge filter layer 8. An effluent weir 621 is located at the top of the inner wall of the square tank 62. The effluent weir 621 is a triangular weir. An inclined tube layer 622 is located at the bottom of the square tank 62, consisting of multiple inclined pipes.
[0037] A sludge pump 612 is installed above the mixed liquor distributor 611, and the sludge pump 612 is connected to a sludge discharge pipe 7. The other end of the sludge discharge pipe 7 is connected to a sludge discharge pipe 71 and a sludge return pipe 72, and the other end of the sludge return pipe 72 is connected to the anoxic zone 3.
[0038] The following describes the technological process of this utility model:
[0039] Wastewater to be treated enters the anoxic zone 3 through the inlet pipe 31. After denitrification in the anoxic zone 3, the denitrified wastewater enters the aerobic zone 4 through the connecting pipe 11 at the top of the partition wall 1. Through the MBBR suspended packing in the aerobic zone, compared with the activated sludge method, the effective biomass can be significantly increased, the wastewater treatment efficiency can be improved, and the total wastewater retention time can be shortened. The wastewater treated in the aerobic zone 4 flows through the screen 2 to the sedimentation zone 5. The sedimentation zone 5 is equipped with a sedimentation tank 6. During the process of the wastewater rising in the sedimentation tank 6 through the mixed liquor distributor 611 at the bottom of the sedimentation tank 6, the activated sludge particles in the wastewater continuously decelerate until they stop moving due to the continuous expansion of the cross-sectional area of the conical tank 61 and the effect of gravity, thereby forming a high-density sludge filter layer 8. The sludge filter layer 8 and the inclined tube layer 622 above it play a role in biological flocculation and filtration of pollutants in the sewage, and separate the sewage into mud and water. After the mud and water separation, the supernatant enters the effluent weir 621 and is discharged, while the activated sludge sinks to the bottom of the sedimentation tank 6. Through the sludge pump 612, part of it is returned to the anoxic zone 3 through the sludge return pipe 72 for denitrification reaction, and part of the excess sludge is discharged through the sludge discharge pipe 71.
[0040] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. An intensive in-situ expansion biochemical system, comprising a biochemical pool, characterized in that: The biochemical tank is divided into an anoxic zone (3), an aerobic zone (4), and a sedimentation zone (5) by partition walls (1) and screens (2) in sequence. A connecting pipe (11) is provided at the top of the partition wall (1). Suspended packing material (42) is provided in the aerobic zone (4). A sedimentation tank (6) is provided in the sedimentation zone (5). The sedimentation tank (6) is composed of a lower conical tank (61) and an upper square tank (62). A mixed liquid distributor (611) is provided at the bottom inlet of the conical tank (61). A water outlet weir (621) is provided at the top of the inner wall of the square tank (62).
2. The intensive in-situ expanded biochemical system according to claim 1, characterized in that: A sludge pump (612) is provided above the mixed liquid distributor (611), and the sludge pump (612) is connected to a sludge outlet pipe (7).
3. The intensive in-situ expanded biochemical system according to claim 2, characterized in that: The other end of the sludge discharge pipe (7) is connected to a sludge discharge pipe (71) and a sludge return pipe (72), and the other end of the sludge return pipe (72) is connected to anoxic zone (3).
4. The intensive in-situ expanded biochemical system according to claim 1, characterized in that: The bottom area of the square tank (62) is provided with an inclined tube layer (622), which is composed of multiple inclined pipes.
5. The intensive in-situ expanded biochemical system according to claim 1, characterized in that: The bottom of the sidewall of the hypoxic zone (3) is provided with a water inlet pipe (31).
6. The intensive in-situ expanded biochemical system according to claim 1, characterized in that: One or more stirrers (32) are provided in the bottom region of the anoxic zone (3).
7. The intensive in-situ expanded biochemical system according to claim 1, characterized in that: The outlet weir (621) is a triangular weir.
8. The intensive in-situ expanded biochemical system according to claim 1, characterized in that: Both the aerobic zone (4) and the sedimentation zone (5) are equipped with aeration devices (41) at their bottoms.
9. The intensive in-situ expanded biochemical system according to claim 8, characterized in that: The aeration device (41) includes an aeration pipe (411) which covers the bottom area of the aerobic zone (4) and the sedimentation zone (5). Multiple aeration discs (412) are evenly spaced on the aeration pipe (411), and multiple aeration holes are opened on the aeration discs (412).
10. The intensive in-situ expanded biochemical system according to claim 1, characterized in that: The suspended packing (42) is an MBBR suspended packing, and the diameter of the suspended packing (42) is larger than the diameter of the screen (2).