Precipitation and dephosphorization integrated equipment

Abstract

The utility model relates to precipitation and dephosphorization integrated equipment which comprises a central cylinder, a precipitation area arranged around the central cylinder and an annular dephosphorization area arranged around the precipitation area, and the annular dephosphorization area is divided into a plurality of dephosphorization sections. Each dephosphorization section comprises an upstream dephosphorization reaction zone, an upstream dephosphorization settling zone, a downstream dephosphorization reaction zone, a downstream dephosphorization settling zone and a dephosphorization effluent weir which are sequentially arranged from upstream to downstream and are in fluid communication. According to the precipitation and dephosphorization integrated equipment disclosed by the utility model, the optimal chemical agent and the dosage of the optimal chemical agent in each dephosphorization section can be flexibly determined according to the type and the content of phosphate in water, so that the effects of improving the dephosphorization effect and reducing the dosage and the cost of the chemical agent are realized.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment, and in particular to an integrated precipitation and phosphorus removal device. Background Technology

[0002] Phosphorus removal in wastewater treatment primarily involves chemical removal. This process involves adding chemical agents (such as aluminum salts, iron salts, and lime) to react with phosphates in the wastewater, forming insoluble precipitates, which are then removed through sedimentation or filtration. The advantages of chemical phosphorus removal are: simple operation, good phosphorus removal effect, treatment efficiency of 80%–90%, stable effect, no re-release of phosphorus leading to secondary pollution, and good phosphorus removal even when the influent concentration is high. The disadvantages are: large dosage of chemicals, high treatment costs, and the generation of large amounts of chemical sludge.

[0003] Therefore, it is still necessary to develop precipitation phosphorus removal equipment and processes for wastewater treatment in order to further address the above-mentioned problems. Utility Model Content

[0004] One objective of this invention is to provide an integrated precipitation and phosphorus removal device to solve the problems in the aforementioned prior art. Specifically, this invention provides the following technical solution.

[0005] One aspect of this utility model provides an integrated precipitation and phosphorus removal device, including a central cylinder, a precipitation zone arranged around the central cylinder, and an annular phosphorus removal zone arranged around the precipitation zone. The annular phosphorus removal zone is divided into N phosphorus removal sections, where N is an integer greater than or equal to 1. The central cylinder is configured to introduce the mixture to be precipitated into the precipitation zone. The precipitation zone is configured to perform solid-liquid separation on the mixture to be precipitated and introduce the resulting supernatant as phosphorus removal influent into at least one of the phosphorus removal sections. The phosphorus removal section includes an upstream phosphorus removal reaction zone, an upstream phosphorus removal precipitation zone, a downstream phosphorus removal reaction zone, a downstream phosphorus removal precipitation zone, and a phosphorus removal effluent weir, which are arranged sequentially from upstream to downstream and are in fluid communication.

[0006] Furthermore, two or more partition walls are provided in the annular phosphorus removal zone to divide the annular phosphorus removal zone into two or more phosphorus removal sections.

[0007] Furthermore, a sedimentation outlet weir is provided on the upper inner wall of the sedimentation zone to introduce the supernatant of the sedimentation zone as phosphorus removal influent into the upstream phosphorus removal reaction zone of at least one phosphorus removal section.

[0008] Furthermore, the upstream phosphorus removal reaction zone and the downstream phosphorus removal reaction zone are respectively equipped with a first dosing device and a second dosing device.

[0009] Furthermore, a first guide plate is provided between the upstream phosphorus removal reaction zone and the upstream phosphorus removal precipitation zone, and / or a second guide plate is provided between the downstream phosphorus removal reaction zone and the downstream phosphorus removal precipitation zone.

[0010] Furthermore, the central cylinder, sedimentation zone, upstream phosphorus removal reaction zone, upstream phosphorus removal sedimentation zone, downstream phosphorus removal reaction zone, downstream phosphorus removal sedimentation zone, and phosphorus removal effluent weir are arranged such that their respective liquid levels decrease sequentially.

[0011] Furthermore, the central cylinder, sedimentation zone, and annular phosphorus removal zone are arranged in a centrally symmetrical concentric ring configuration.

[0012] Furthermore, each of the sedimentation zone, upstream phosphorus removal reaction zone, upstream phosphorus removal sedimentation zone, downstream phosphorus removal reaction zone, and downstream phosphorus removal sedimentation zone is independently equipped with a sludge discharge device at its bottom.

[0013] Furthermore, the sludge discharge device is a sludge suction device, a sludge discharge ditch, a sludge discharge pipe, and equipment that can sweep or scrape sludge at the bottom of the pool, or any combination thereof.

[0014] Furthermore, the sludge suction device is also connected to an air supply pipe to allow for air backwashing of the sedimentation zone or annular dephosphorization zone.

[0015] This integrated precipitation and phosphorus removal equipment combines the precipitation and phosphorus removal zones in a concentric ring arrangement, reducing material usage, saving space, and eliminating the need for pumping equipment and energy consumption through gravity-flow of the feed solution. Furthermore, by setting up multiple phosphorus removal sections and adding the same or different chemical agents in each section at the same or different dosages, this integrated precipitation and phosphorus removal equipment allows for flexible determination of the optimal chemical agents and their dosages for each phosphorus removal section based on the type and content of phosphates in the water. This improves phosphorus removal efficiency while reducing the amount and cost of chemical agents used.

[0016] The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the purpose of describing this utility model 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 utility model. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] The terms "basically" or "substantially" do not exclude the meaning of "completely." For example, if an ingredient "substantially contains" Y, it can also mean that it contains no Y at all. When a specific numerical value is specified, it means that the specific value has a range of fluctuation based on that specific value. The fluctuation range can be + / -5%, + / -4%, + / -3%, + / -2%, + / -1%, + / -0.5%, + / -0.2%, + / -0.1%, + / -0.05%, + / -0.01%, etc., of the specific value. If necessary, "basically" or "substantially" can be replaced by the above fluctuation range or deleted from the definition of this utility model. "Contains" includes both the mentioned factors and may include additional or uncertain factors. When "approximately", "about", or "around" is used to specify a specific value, it means that the specific value has a range of fluctuation based on that specific value. The fluctuation range can be + / -5%, + / -4%, + / -3%, + / -2%, + / -1%, + / -0.5%, + / -0.2%, + / -0.1%, + / -0.05%, + / -0.01%, etc. Attached Figure Description

[0018] Figure 1 This is a top view of an integrated precipitation and phosphorus removal device according to one embodiment of the present invention.

[0019] Figure 2 According to Figure 1 A schematic diagram of the AA cross-sectional structure of the integrated precipitation and phosphorus removal equipment;

[0020] Figure 3 According to Figure 1A schematic diagram of the cross-sectional structure of the integrated precipitation and phosphorus removal equipment;

[0021] Figure 4 According to Figure 1 A schematic diagram of the CC cross-sectional structure of the integrated precipitation and phosphorus removal equipment;

[0022] Figure 5 According to Figure 1 A schematic diagram of the DD cross-sectional structure of the integrated precipitation and phosphorus removal equipment;

[0023] The meanings of the markings in the diagram are as follows: 11-Sedimentation zone, 21-Upstream phosphorus removal reaction zone, 22-Upstream phosphorus removal sedimentation zone, 23-Downstream phosphorus removal reaction zone, 24-Downstream phosphorus removal sedimentation zone, 31-Central cylinder, 32-First tank wall, 33-Sedimentation effluent weir, 34-Second tank wall, 35-Phosphorus removal effluent weir, 41-Mixed liquor to be settled, 42-Phosphorus removal influent, 43-First chemical agent, 44-Second chemical agent, 45-Phosphorus removal effluent, 51-First partition wall, 52-Second partition wall, 53-Third partition wall, 54-First guide plate, 55-Second guide plate. Detailed Implementation

[0024] The following description, in conjunction with the accompanying drawings, further illustrates some embodiments of the present invention, but is not intended to limit the scope of protection of the present invention.

[0025] refer to Figure 1-5 The integrated precipitation and phosphorus removal equipment of this utility model includes a central cylinder 31, a precipitation zone 11 arranged around the central cylinder 31, and an annular phosphorus removal zone arranged around the precipitation zone 11. The annular phosphorus removal zone is provided with a first partition wall 51 and a second partition wall 52 to divide the annular phosphorus removal zone into two or more phosphorus removal sections. Each phosphorus removal section includes, sequentially arranged from upstream to downstream, an upstream phosphorus removal reaction zone 21, an upstream phosphorus removal precipitation zone 22, a downstream phosphorus removal reaction zone 23, a downstream phosphorus removal precipitation zone 24, and a phosphorus removal effluent weir 35. In some cases, the central cylinder 31, the precipitation zone 11, and the annular phosphorus removal zone are arranged in a centrally symmetrical concentric ring form (e.g., a concentric circular ring or a concentric rectangle).

[0026] The lower end of the central cylinder 31 has a channel in fluid communication with the sedimentation zone 11 for introducing the mixed liquid 41 to be precipitated from the central cylinder 31 into the lower part of the sedimentation zone 11. The upper inner wall of the sedimentation zone 11 is provided with a sedimentation outlet weir 33 for introducing the supernatant of the sedimentation zone 11 as dephosphorization influent 42 into at least one upstream dephosphorization reaction zone 21 of the dephosphorization section. The upstream dephosphorization reaction zone 21 is provided with a first dosing device for adding a first chemical agent 43 to the upstream dephosphorization reaction zone 21 so that the first chemical agent 43 reacts with the phosphate in the dephosphorization influent 42 to form an insoluble precipitate. Optionally, a first guide plate 54 can be provided between the upstream phosphorus removal reaction zone 21 and the upstream phosphorus removal precipitation zone 22 to prevent the mixed liquid in the upstream phosphorus removal precipitation zone 22 from flowing back into the upstream phosphorus removal reaction zone 21 or the mixed liquid in the upstream phosphorus removal reaction zone 21 from short-circuiting into the upstream phosphorus removal precipitation zone 22. This improves the effect of the first chemical agent 43 reacting with phosphate in the upstream phosphorus removal reaction zone 21 to form an insoluble precipitate. The first guide plate 54 can be provided at the top to prevent the mixed liquid from entering the upstream phosphorus removal precipitation zone 22 from the upstream phosphorus removal reaction zone 21, while a channel is provided at the bottom to allow the mixed liquid to enter the upstream phosphorus removal precipitation zone 22 from the upstream phosphorus removal reaction zone 21.

[0027] The downstream phosphorus removal reaction zone 23 is equipped with a second dosing device for adding a second chemical agent 44 to the downstream phosphorus removal reaction zone 23 so that the second chemical agent 44 reacts with the residual phosphate (i.e., phosphate that has not reacted with the first chemical agent 43) in the mixture from the upstream phosphorus removal precipitation zone 22 to form an insoluble precipitate in the downstream phosphorus removal reaction zone 23. Optionally, a third partition wall 53 may be provided between the upstream phosphorus removal precipitation zone 22 and the downstream phosphorus removal reaction zone 23. The third partition wall 53 has a channel in its middle or upper part to allow the supernatant in the upstream phosphorus removal precipitation zone 22 to enter the downstream phosphorus removal reaction zone 23, and to prevent the precipitate in the upstream phosphorus removal precipitation zone 22 from entering the downstream phosphorus removal reaction zone 23. Since the precipitate in the upstream phosphorus removal precipitation zone 22 may adsorb some residual phosphate, if these residual phosphates do not enter the downstream phosphorus removal reaction zone 23 but are removed together with the precipitate in the upstream phosphorus removal precipitation zone 22, the amount of the second chemical agent 44 required in the downstream phosphorus removal reaction zone 23 can be reduced, thereby reducing the cost of the chemical agent, and may also reduce the total amount of phosphorus-containing precipitate that needs to be discharged and the corresponding treatment costs.

[0028] In some cases, the type and dosage of the second chemical agent 44 to be added to the downstream phosphorus removal reaction zone 23 can be determined after testing the residual phosphate content in the mixed liquor from the upstream phosphorus removal precipitation zone 22. Since the type and content of phosphate in wastewater often fluctuate over time, the above operation provides an opportunity to adjust the type and dosage of the second chemical agent 44. Appropriate chemical agents can be selected based on the type and content of phosphate in the mixed liquor, avoiding excessive or inappropriate use of chemicals, thereby saving on phosphorus removal costs.

[0029] A second guide plate 55 may be optionally provided between the downstream phosphorus removal reaction zone 23 and the downstream phosphorus removal precipitation zone 24 to prevent the mixed liquid in the downstream phosphorus removal precipitation zone 24 from flowing back into the downstream phosphorus removal reaction zone 23 or the mixed liquid in the downstream phosphorus removal reaction zone 23 from short-circuiting into the downstream phosphorus removal precipitation zone 24. This improves the effect of the second chemical agent 44 reacting with phosphate in the downstream phosphorus removal reaction zone 23 to form an insoluble precipitate. The second guide plate 55 may be provided at the top to prevent the mixed liquid from entering the downstream phosphorus removal precipitation zone 24 from the downstream phosphorus removal reaction zone 23, while a channel is provided at the bottom to allow the mixed liquid to enter the downstream phosphorus removal precipitation zone 24 from the downstream phosphorus removal reaction zone 23.

[0030] The downstream phosphorus removal sedimentation zone 24 is defined by a second partition wall 52. A phosphorus removal effluent weir 35 is provided on the upper side wall of the second partition wall 52 to discharge the supernatant from the downstream phosphorus removal sedimentation zone 24 as phosphorus removal effluent 45. The upper edge of the phosphorus removal effluent weir 35 is lower than the height of the sedimentation effluent weir 33, thereby ensuring that the liquid level of the phosphorus removal influent 42 is higher than the liquid level of the phosphorus removal effluent 45. This allows the mixed liquid in the integrated sedimentation and phosphorus removal equipment of this invention to flow by gravity, reducing the equipment for transporting the mixed liquid and the corresponding purchase and maintenance costs.

[0031] In some cases, the first chemical agent 43 and the second chemical agent 44 may be the same or different, and each may be independently selected from the following substances and their solutions: lime, aluminum sulfate, sodium aluminate, ferric chloride, ferric sulfate, ferrous sulfate, ferrous chloride, and any combination thereof.

[0032] In some cases, the first and second dosing devices may be the same or different, and are independently selected from manual dosing devices, automatic dosing devices, or combinations thereof, such as dosing shovels, dosing funnels, screw conveyors, dosing pumps, and any combination thereof.

[0033] In some cases, the sedimentation zone 11, the upstream phosphorus removal reaction zone 21, the upstream phosphorus removal sedimentation zone 22, the downstream phosphorus removal reaction zone 23, and the downstream phosphorus removal sedimentation zone 24 are each independently equipped with sludge discharge devices at the bottom. These devices include, for example, sludge suction devices, sludge discharge ditches, sludge discharge pipes, and equipment for sweeping or scraping sludge at the bottom of the tank, or any combination thereof, to ensure sludge discharge from the integrated sedimentation and phosphorus removal equipment of this invention. In some cases, the sludge suction device can also be connected to a blower duct to achieve air backwashing. This removes the sludge accumulated at the bottom of the tank, the sludge that is difficult to remove from dead zones, and the sludge that is difficult to discharge.

[0034] In the following cases, the annular phosphorus removal zone can be divided into more than two (e.g., 3, 4, 5, 6, 7, 8, 9, or 10) phosphorus removal sections, each with the structure described above, and each capable of performing phosphorus removal reaction, phosphorus removal precipitation, and phosphorus removal effluent separately.

[0035] This integrated precipitation and phosphorus removal equipment utilizes a concentric ring arrangement to compactly integrate the precipitation and phosphorus removal zones, reducing material usage, saving space, and eliminating the need for pumping equipment and energy consumption through gravity-flow of the feed solution. Furthermore, by setting up multiple phosphorus removal sections and adding the same or different chemical agents in each section at the same or different dosages, this integrated precipitation and phosphorus removal equipment allows for flexible determination of the optimal chemical agents and their dosages for each phosphorus removal section based on the type and content of phosphates in the water. This improves phosphorus removal efficiency while reducing the amount and cost of chemical agents used.

[0036] The present invention has been described above by way of example. However, it should be understood that the present invention is by no means limited to these specific embodiments. Those skilled in the art can make various modifications or variations to the present invention, and all such modifications and variations fall within the protection scope of the present invention.

Claims

1. An integrated precipitation and phosphorus removal device, characterized in that, The system includes a central cylinder, a sedimentation zone surrounding the central cylinder, and an annular phosphorus removal zone surrounding the sedimentation zone. The annular phosphorus removal zone is divided into N phosphorus removal sections, where N is an integer greater than or equal to 1. The central cylinder is configured to introduce the mixture to be precipitated into the sedimentation zone. The sedimentation zone is configured to perform solid-liquid separation on the mixture to be precipitated and to introduce the resulting supernatant as phosphorus removal influent into at least one of the phosphorus removal sections. The phosphorus removal section includes an upstream phosphorus removal reaction zone, an upstream phosphorus removal sedimentation zone, a downstream phosphorus removal reaction zone, a downstream phosphorus removal sedimentation zone, and a phosphorus removal effluent weir, which are arranged sequentially from upstream to downstream and are in fluid communication.

2. The integrated precipitation and phosphorus removal equipment according to claim 1, characterized in that, Two or more partition walls are provided in the annular phosphorus removal zone to divide the annular phosphorus removal zone into two or more phosphorus removal sections.

3. The integrated precipitation and phosphorus removal equipment according to claim 1, characterized in that, The upper inner wall of the sedimentation zone is provided with a sedimentation outlet weir to introduce the supernatant of the sedimentation zone as phosphorus removal influent into the upstream phosphorus removal reaction zone of at least one phosphorus removal section.

4. The integrated precipitation and phosphorus removal equipment according to claim 1, characterized in that, The upstream phosphorus removal reaction zone and the downstream phosphorus removal reaction zone are respectively equipped with a first dosing device and a second dosing device.

5. The integrated precipitation and phosphorus removal equipment according to claim 1, characterized in that, A first guide plate is provided between the upstream phosphorus removal reaction zone and the upstream phosphorus removal precipitation zone, and / or a second guide plate is provided between the downstream phosphorus removal reaction zone and the downstream phosphorus removal precipitation zone.

6. The integrated precipitation and phosphorus removal equipment according to any one of claims 1-5, characterized in that, The central cylinder, sedimentation zone, upstream phosphorus removal reaction zone, upstream phosphorus removal sedimentation zone, downstream phosphorus removal reaction zone, downstream phosphorus removal sedimentation zone, and phosphorus removal effluent weir are arranged such that the liquid level height of each zone decreases sequentially.

7. The integrated precipitation and phosphorus removal equipment according to any one of claims 1-5, characterized in that, The central cylinder, sedimentation zone, and annular phosphorus removal zone are arranged in a centrally symmetrical concentric ring configuration.

8. The integrated precipitation and phosphorus removal equipment according to any one of claims 1-5, characterized in that, Each of the sedimentation zone, upstream phosphorus removal reaction zone, upstream phosphorus removal sedimentation zone, downstream phosphorus removal reaction zone, and downstream phosphorus removal sedimentation zone is independently equipped with a sludge discharge device at its bottom.

9. The integrated precipitation and phosphorus removal equipment according to claim 8, characterized in that, The sludge discharge device is a sludge suction device, a sludge discharge ditch, a sludge discharge pipe, and equipment that can sweep or scrape sludge at the bottom of the pool, or any combination thereof.

10. The integrated precipitation and phosphorus removal equipment according to claim 9, characterized in that, The sludge suction device is also connected to an air supply pipe to allow for backwashing of the sedimentation zone or annular dephosphorization zone.

Images