Phosphorus recovery device

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a phosphorus recovery device. The device comprises an outer shell, a middle shell, an inner shell, a water inlet pipe, a water drainage pipe, a discharge port, a plug flow stirring assembly, a folded plate vortex assembly, a modular vortex assembly and an inclined plate assembly, and the outer shell, the middle shell and the inner shell are combined to form a first water flow ascending channel, a water flow descending channel and a second water flow ascending channel; a plug flow stirring assembly and a folded plate vortex assembly are arranged in the first water flow ascending channel, a modular vortex assembly is arranged in the water flow descending channel, an inclined plate assembly is arranged in the second water flow ascending channel, and wastewater is uniformly mixed to form tiny crystals when passing through the first water flow ascending channel; and large-particle crystal grains are obtained under the action of micro vortexes after entering the water flow descending channel, fall into the solid-liquid separation area under the dual action of gravity and the settling inclined plate after entering the second water flow ascending channel and are discharged through the discharging opening, the overall structure of the device is simple, efficient phosphorus recycling can be achieved, and practicability is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field, concretely relates to a kind of phosphorus recovery device. BACKGROUND

[0002] Recovery phosphorus element from sewage and convert into phosphorus fertilizer, with remarkable environmental protection significance and economic value, both reduce the phosphorus emission in sewage, protect water environment, and provide sustainable phosphorus fertilizer source for agricultural production.

[0003] Phosphorus in liquid phase is currently mainly recycled using crystallization method. Orthophosphate (PO4 3－ ) in liquid phase is precipitated in the form of phosphate mineral, and the main precipitation forms include struvite (ammonium magnesium phosphate, MAP), hydroxyapatite (HAP) and the like, and the product formed has low heavy metal content and can be directly applied to agriculture to realize resource utilization of phosphorus. Struvite crystallization method can simultaneously recover phosphorus and ammonia nitrogen in liquid phase, and is the most widely researched and applied phosphorus recovery technology.

[0004] In the phosphorus crystallization recovery process, reactor is a core device, and the type and design of reactor directly relate to the purity of product. At present, the most commonly used for synthesizing ammonium magnesium phosphate is stirring type crystallization reactor, but it has the disadvantages of low product purity and more impurities, and the formed crystal particles have small particle size, so that the efficiency of phosphorus recovery is adversely affected.

[0005] In view of the above, there is an urgent need for a device with simple structure and beneficial to phosphorus recovery to solve the problems in the prior art. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a kind of phosphorus recovery device with simple structure and beneficial to phosphorus recovery, which comprises an outer shell, a middle shell, an inner shell, a water inlet pipe, a drain pipe, a discharge port, a plug flow stirring assembly, a folded plate vortex assembly, a modular vortex assembly and a sloping plate assembly. The outer shell, the middle shell and the inner shell are arranged from outside to inside to form a first water flow upward channel, a water flow downward channel and a second water flow upward channel. The plug flow stirring assembly and the folded plate vortex assembly are arranged from top to bottom in the first water flow upward channel. The modular vortex assembly is arranged in the water flow downward channel. The sloping plate assembly is arranged in the second water flow upward channel. The wastewater entering from the water inlet pipe is fully mixed and uniformly formed into small crystal particles in the first water flow upward channel. The crystal particles gradually grow into large particle crystal grains under the action of a large number of micro-vortices in the water flow downward channel. Part of the large particle crystal grains falls into the solid-liquid separation zone at the lower end of the outer shell under the action of gravity. Then, the large particle crystal grains slide to the solid-liquid separation zone under the action of gravity and the settling sloping plate in the second water flow upward channel. Finally, the large particle crystal grains are discharged through the discharge port. The device has simple overall structure and can realize efficient recovery of phosphorus, and has strong practicability.

[0007] The specific technical solutions are as follows:

[0008] The phosphorus recovery device comprises an outer shell, a middle shell, an inner shell, a water inlet pipe, a water outlet pipe, a discharge port, a push-flow stirring assembly, a folded-plate vortex assembly, a modular vortex assembly and an inclined plate assembly.

[0009] The outer shell comprises a first cylindrical barrel arranged in series from top to bottom and a first conical barrel which is wide at the top and narrow at the bottom and has a closed lower end, a first containing cavity is arranged in the first cylindrical barrel, a second containing cavity which is in communication with the first containing cavity is arranged in the first conical barrel, and the discharge port is in communication with the second containing cavity; a water collecting groove is arranged at the upper portion of the first containing cavity.

[0010] The middle shell comprises a second cylindrical barrel arranged in series from top to bottom and a second conical barrel which is wide at the top and narrow at the bottom and has an opening at the lower end, a third containing cavity is arranged in the second cylindrical barrel, and a fourth containing cavity which is in communication with the third containing cavity is arranged in the second conical barrel; the upper end of the second conical barrel is located in the first containing cavity, and the lower end of the second conical barrel is located in the second containing cavity.

[0011] The inner shell comprises a third cylindrical barrel arranged in the third containing cavity, and the third cylindrical barrel comprises a fifth containing cavity which has openings at both the upper end and the lower end.

[0012] The fifth containing cavity forms a first water flow upward channel, a water flow downward channel is formed between the inner wall of the second cylindrical barrel and the outer wall of the third cylindrical barrel, the inner wall of the first containing cavity, the inner wall of the second containing cavity, the outer wall of the third containing cavity, the outer wall of the fourth containing cavity and the water collecting groove enclose a second water flow upward channel, the push-flow stirring assembly and the folded-plate vortex assembly are arranged in the first water flow upward channel from top to bottom, the modular vortex assembly is arranged in the water flow downward channel, and the inclined plate assembly is arranged in the second water flow upward channel.

[0013] The water inlet pipe penetrates the side wall of the first cylindrical barrel and the side wall of the second cylindrical barrel and is inserted into the upper portion of the first water flow upward channel, and the water outlet end of the water inlet pipe is lower than the position of the water collecting groove; the water outlet pipe is in communication with the water collecting groove.

[0014] Preferably, the upper end of the first cylindrical barrel is provided with an opening, and a detachable cover plate is arranged at the opening. The detachable cover plate facilitates the opening of the outer shell and the inspection or replacement of the internal components.

[0015] Preferably, the plug flow stirring assembly comprises a stirring power source, a stirring shaft and stirring blades, the stirring power source is arranged on the detachable cover plate, the connecting end of the stirring shaft is connected with the output end of the stirring power source, and the stirring blades are arranged on the free end of the stirring shaft; the outlet end of the water inlet pipe is located 20-50 cm above the stirring blades. The design of the stirring power source, the stirring shaft and the stirring blades can provide sufficient upward force for the water flow in the first water flow upward channel, facilitate the liquid to smoothly enter the water flow downward channel, and also facilitate the contact and mixing of the orthophosphate in the water and the crystal forming ions (magnesium ions, ammonium ions) in the medicament under the mechanical stirring condition to form the tiny struvite crystals (crystal nucleus).

[0016] Preferably, the baffle vortex assembly is located directly below the plug flow stirring assembly, and the baffle vortex assembly comprises a first baffle and a second baffle arranged side by side, the first baffle comprises a plurality of connecting plates connected in sequence, and the included angle α between adjacent two connecting plates is 80°-100°; the first baffle and the second baffle are mirror image structures. The unique design of the baffle vortex assembly can promote the generation of vortex and strengthen the formation and growth of crystal grains.

[0017] Preferably, the top end of the baffle vortex assembly is 0.4-0.8 m away from the lower edge of the plug flow stirring assembly, and the lower end is flush with the lower end of the fifth containing cavity; the first baffle and the second baffle are arranged alternately.

[0018] Preferably, the upper end of the modular vortex assembly is located below the liquid surface in the first containing cavity by 0.5 m, and the lower end is 0.4-0.8 m away from the lower end of the first containing cavity; the shape of the modular vortex assembly is a fan ring columnar cube, and the horizontal projection is a fan ring shape.

[0019] Preferably, the modular vortex assembly comprises a plurality of vortex monomers arranged in layers or at intervals, and the vortex monomer is a hollow columnar body enclosed by a first vertical plate, a second vertical plate, an upper arc-shaped outer frame, an upper arc-shaped inner frame, a lower arc-shaped outer frame and a lower arc-shaped inner frame.

[0020] Preferably, the vortex monomer is provided with a vortex sheet, and the cross section of the vortex sheet is at least one of a triangle, a semicircle and a rectangle.

[0021] Preferably, the inclined plate assembly comprises a plurality of precipitation inclined plates arranged side by side, the precipitation inclined plates are arranged at an angle with the inner wall of the first containing cavity; and the inclined plate assembly is located in the middle and lower part of the first containing cavity.

[0022] Preferably, the size of the opening of the second conical cylinder is 0.3-0.6 times the size of the fifth containing cavity; the first columnar cylinder, the first conical cylinder, the second columnar cylinder, the second conical cylinder and the third columnar cylinder are arranged on the same central axis.

[0023] In addition to the above described objects, features and advantages, the present application has other objects, features and advantages. These will become apparent from the following detailed description of the application, when considered in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and serve to explain the present application, and are not intended to limit the present application unduly. In the drawings:

[0025] Figure 1 is a structural schematic diagram of the phosphorus recovery device in the selected embodiment (the black arrows in the figure represent the water flow direction);

[0026] Figure 2 is Figure 1 is a top view of the installation of the folded plate vortex assembly into the inner shell;

[0027] Figure 3 is Figure 2 is a M-M sectional view;

[0028] Figure 4 is Figure 1 is a structural schematic diagram of the vortex monomer in the modular vortex assembly;

[0029] Figure 5 is Figure 4 is a top view after the installation of multiple vortex plates;

[0030] Figure 6 is Figure 5 is an N-N sectional view.

[0031] In the drawings: 1, outer shell, 1.1, first cylindrical body, 1.2, first conical body, 1.3, first accommodating cavity, 1.4, second accommodating cavity, 1.5, detachable cover plate; 2, middle shell, 2.1, second cylindrical body, 2.2, second conical body, 2.3, third accommodating cavity, 2.4, fourth accommodating cavity; 3, inner shell, 3.1, third cylindrical body, 3.2, fifth accommodating cavity; 4, water collecting tank, 5, water inlet pipe, 6, drain pipe, 7, discharge port; 8, push-flow stirring assembly, 8.1, stirring power source, 8.2, stirring shaft, 8.3, stirring blade; 9, folded plate vortex assembly, 9.1, first folded plate, 9.2, second folded plate, a, connecting plate; 10, modular vortex assembly, 10.1, first vertical plate, 10.2, second vertical plate, 10.3, upper arc-shaped outer frame, 10.4, upper arc-shaped inner frame, 10.5, lower arc-shaped outer frame, 10.6, lower arc-shaped inner frame, b, semicircular shell vortex plate, c, isosceles right triangle vortex plate; 11, inclined plate assembly;

[0032] A, first water flow upward channel, B, water flow downward channel, C, second water flow upward channel, D, crystal accumulation area. DETAILED DESCRIPTION

[0033] The embodiments of the present application are described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as limited and covered by the claims.

[0034] Embodiment:

[0035] Reference Figure 1 A phosphorus recovery device, comprising an outer shell 1, a middle shell 2, an inner shell 3, a water inlet pipe 5, a drain pipe 6, a discharge port 7, a push-flow stirring assembly 8, a folded plate vortex assembly 9, a modular vortex assembly 10, and a inclined plate assembly 11. Details are as follows:

[0036] The outer shell 1 comprises a first cylindrical barrel 1.1 and a first conical barrel 1.2 (a frustum structure is shown in the figure) arranged in series from top to bottom, a first containing cavity 1.3 is arranged in the first cylindrical barrel 1.1, a second containing cavity 1.4 in communication with the first containing cavity 1.3 is arranged in the first conical barrel 1.2, and the discharge port 7 is in communication with the second containing cavity 1.4; a water collecting tank 4 is arranged at the upper part of the first containing cavity 1.3. In this embodiment, the discharge port 7 is arranged at the bottom of the side wall of the second containing cavity 1.4, the lower part of the second containing cavity 1.4 forms a crystal accumulation area D, and the discharge port is used to discharge the crystal in the crystal accumulation area D; the water collecting tank has a ring structure. An opening is arranged at the upper end of the first cylindrical barrel 1.1, and a detachable cover plate 1.5 is arranged at the opening.

[0037] The middle shell 2 comprises a second cylindrical barrel 2.1 and a second conical barrel 2.2 arranged in series from top to bottom, a third containing cavity 2.3 is arranged in the second cylindrical barrel 2.1, and a fourth containing cavity 2.4 in communication with the third containing cavity 2.3 is arranged in the second conical barrel 2.2; the upper end of the second conical barrel 2.2 is located in the first containing cavity 1.3, and the lower end thereof is located in the second containing cavity 1.4.

[0038] The inner shell 3 comprises a third cylindrical barrel 3.1 arranged in the third containing cavity 2.3, and the third cylindrical barrel 3.1 comprises a fifth containing cavity 3.2 with openings arranged at the upper and lower ends thereof. In this embodiment, the size of the opening of the second conical barrel 2.2 is 0.3-0.6 times the size of the fifth containing cavity 3.2.

[0039] The fifth accommodating cavity 3.2 forms a first water flow upward channel A; the inner wall of the second cylindrical body 2.1 (i.e. the inner wall of the third accommodating cavity 2.3) and the outer wall of the third cylindrical body 3.1 (i.e. the inner wall of the fifth accommodating cavity) form a water flow downward channel B; and the inner wall of the first accommodating cavity 1.3, the inner wall of the second accommodating cavity 1.4, the outer wall of the third accommodating cavity 2.3, the outer wall of the fourth accommodating cavity 2.4 and the water collecting groove 4 enclose a second water flow upward channel C. In this embodiment, the lower end of the second conical body 2.2 is provided with an opening, which facilitates the flow of fluid from the fourth accommodating cavity into the second water flow upward channel C; the upper end of the fifth accommodating cavity 3.2 is provided with an opening, which facilitates the flow of fluid from the first water flow upward channel A in the fifth accommodating cavity into the corresponding water flow downward channel B region in the third accommodating cavity; and the lower end of the fifth accommodating cavity 3.2 is provided with an opening, which facilitates the flow of fluid from the corresponding water flow downward channel B region in the fourth accommodating cavity into the first water flow upward channel A in the fifth accommodating cavity, so that the liquid circulates.

[0040] The push-flow stirring assembly 8 and the folded-plate vortex assembly 9 are arranged in the first water flow upward channel A from top to bottom; the modular vortex assembly 10 is arranged in the water flow downward channel B; and the inclined plate assembly 11 is arranged in the second water flow upward channel C. The detailed structures of the push-flow stirring assembly 8, the folded-plate vortex assembly 9, the modular vortex assembly 10 and the inclined plate assembly 11 are as follows:

[0041] The push-flow stirring assembly 8 comprises a stirring power source 8.1, a stirring shaft 8.2 and stirring blades 8.3. The stirring power source 8.1 is arranged on the detachable cover plate 1.5, the connecting end of the stirring shaft 8.2 is connected with the output end of the stirring power source 8.1, and the stirring blades 8.3 are arranged on the free end of the stirring shaft 8.2. The water outlet end of the water inlet pipe 5 is located 20-50 cm above the stirring blades 8.3. In this embodiment, the push-flow stirring device 8 lifts the liquid and suspended particles in the fifth accommodating cavity 3.2 at the lower section of the first water flow upward channel A to the upper section of the first water flow upward channel A, and provides a pushing force for the circulating flow of water.

[0042] The folded-plate vortex assembly 9 is located directly below the push-flow stirring assembly 8, and comprises first folded plates 9.1 and second folded plates 9.2 arranged side by side. The first folded plates 9.1 comprise a plurality of connection plates a connected in sequence, and the included angle α between adjacent two connection plates a is 80°-100°. The first folded plates 9.1 and the second folded plates 9.2 have a mirror image structure. In this embodiment, it is preferred that Figure 2 and Figure 3The top end of the folded-plate vortex assembly 9 is 0.4-0.8 m away from the lower edge of the push-flow stirring assembly 8, and the lower end is flush with the lower end of the fifth containing cavity 3.2. The folded-plate vortex assembly 9 comprises two first folded plates 9.1 and two second folded plates 9.2, which are arranged alternately. The length L1 of the connecting plate a is 20%-30% of the diameter of the fifth containing cavity 3.2. The lengths of the connecting plates in the same first folded plate or second folded plate are the same. The wave crests and wave troughs of the adjacent first folded plate and second folded plate are horizontally aligned. The horizontal distance L2 between the first folded plate and the second folded plate is equal and is 10%-15% of the diameter of the fifth containing cavity 3.2.

[0043] The upper end of the modular vortex assembly 10 is 0.5 m below the liquid level in the first containing cavity 1.3, and the lower end is 0.4-0.8 m away from the lower end of the first containing cavity 1.3. The shape of the modular vortex assembly 10 is a fan-ring cylindrical cube, and the horizontal projection is a fan-ring shape. In this embodiment, the modular vortex assembly 10 preferably comprises a plurality of vortex monomers stacked or spaced apart. The vortex monomer is a hollow cylindrical body enclosed by a first vertical plate 10.1, a second vertical plate 10.2, an upper arc-shaped outer frame 10.3, an upper arc-shaped inner frame 10.4, a lower arc-shaped outer frame 10.5, and a lower arc-shaped inner frame 10.6. See Figure 4 Further preferably, the first vertical plate 10.1, the second vertical plate 10.2, the upper arc-shaped outer frame 10.3, the upper arc-shaped inner frame 10.4, the lower arc-shaped outer frame 10.5, and the lower arc-shaped inner frame 10.6 are all made of metal or engineering plastic material and can bear the weight of the frame itself and the vortex sheet installed inside.

[0044] Further preferably in this embodiment, the vortex monomer is provided with a vortex sheet, and the cross section of the vortex sheet is at least one of a triangle, a semicircle, and a rectangle. As shown in Figure 5 and Figure 6The vortex monomer is internally provided with multiple vortex sheets, and the vortex sheets include at least one of a semicircular shell vortex sheet b and an isosceles right triangle vortex sheet c, and the semicircular shell vortex sheet and the isosceles right triangle vortex sheet are alternately arranged.

[0045] The inclined plate assembly 11 comprises multiple sediment inclined plates arranged side by side, the sediment inclined plates are arranged at an angle with the inner wall of the first accommodating cavity, and the inclined plate assembly 11 is located at the middle and lower part of the first accommodating cavity.

[0046] The water inlet pipe 5 penetrates the side wall of the first columnar cylinder 1.1 and the side wall of the second columnar cylinder 2.1 and is inserted into the upper part of the first water flow rising channel A, and the water outlet end of the water inlet pipe 5 is lower than the position of the water collecting tank 4.

[0047] The water outlet pipe 6 is communicated with the water collecting tank 4.

[0048] Further preferably in the embodiment, the first columnar cylinder 1.1, the first conical cylinder 1.2, the second columnar cylinder 2.1, the second conical cylinder 2.2 and the third columnar cylinder 3.1 are arranged along the same central axis.

[0049] The technical scheme of the utility model is applied, specifically:

[0050] The wastewater containing orthophosphate and the reagent (magnesium salt, ammonium salt, alkali when struvite crystallization is adopted) are mixed and then enter the first water flow upward passage A (and are located above the stirring blade 8.3) through the water inlet pipe 5; the stirring power source 8.1 is started to drive the stirring shaft 8.2 and the stirring blade 8.3 thereon to rotate, an upward thrust is generated, the liquid and the suspended particulate matters in the first water flow upward passage A are stirred and mixed, and the liquid mixture is circulated in the lower section of the first water flow upward passage A, the upper section of the first water flow upward passage A and the water flow downward passage B.

[0051] The orthophosphate in the water inlet and the crystal-forming ions (magnesium ions, ammonium ions) in the reagent are mixed and contacted under the mechanical stirring condition of the plug flow stirring assembly 8 to form small magnesium ammonium phosphate crystals (crystal nucleus), the small crystals are circulated in the lower section of the first water flow upward passage A, the upper section of the first water flow upward passage A and the water flow downward passage B, when passing through the baffle vortex assembly 9 and the modular vortex assembly 10, the crystal-forming ions in the wastewater are further mixed and contacted under the action of a large number of micro-vortices generated by the baffle vortex assembly 9 and the modular vortex assembly 10, the small crystal particles are presented to be fluidized, the small crystal particles and the crystal nucleus and the crystal-forming ions are fully collided and contacted under the action of the micro-vortices, secondary nucleation occurs, self-induced crystallization is realized without adding crystal seeds, the particle size of the crystal particles gradually increases, when the particle size and the mass of the crystal particles increase to a certain extent, the large crystal particles are automatically separated from the circulating water flow under the action of gravity, fall from the lower opening of the fourth containing cavity to the crystal gathering area D, and the water flow after crystallization is discharged from the lower opening of the fourth containing cavity into the second water flow upward passage C, the fine crystal particles carried in the water flow are further subjected to solid-liquid separation under the action of gravity and the inclined plate assembly 11, the crystal particles are precipitated and then slide to the crystal gathering area D under the action of gravity, the supernatant after precipitation is collected upward to the water collecting tank 4 through the second water flow upward passage C, and is discharged from the phosphorus recovery device through the drain pipe 6. The struvite crystals accumulated in the crystal gathering area D are regularly discharged through the discharge port 7.

[0052] The technical scheme of the embodiment has the following beneficial effects:

[0053] 1. The phosphorus recovery device in this embodiment adopts an outer shell, a middle shell, and an inner shell arranged from the outside to the inside to form a first water flow upward channel, a water flow downward channel, and a second water flow upward channel. In the first water flow upward channel, a push-flow stirring component and a baffle vortex component are arranged from top to bottom. In the water flow downward channel, a modular vortex component is arranged. The mechanical stirring component and the vortex component installed in the circulation channel constitute a mechanical stirring mixing crystallization + hydraulic vortex crystallization composite system. Due to its special structure, hydraulic classification is realized in the water flow circulation channel during operation, so that the solution is fully mixed with materials and the crystal particles are fluidized. Self-induced crystallization is achieved without the addition of external crystal seeds, and the particle size of the crystal particles is larger than that of traditional stirring crystallization.

[0054] 2. In this embodiment, the water circulation channel formed by the combination of the middle shell and the inner shell in the phosphorus recovery device can automatically sort the crystal particles. Larger particles will automatically detach from the circulating water and enter the crystal aggregation zone under the action of gravity, while smaller particles will continue to crystallize in the water circulation channel. When the size and mass reach a certain level, they will automatically detach from the circulating water and enter the crystal aggregation zone under the action of gravity. The crystal particles collected in the crystal aggregation zone are larger in size and have higher purity than those obtained by traditional stirring crystallization.

[0055] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A phosphorus recovery apparatus, characterized by, The device comprises an outer shell (1), a middle shell (2), an inner shell (3), a water inlet pipe (5), a water outlet pipe (6), a discharge port (7), a push-flow stirring assembly (8), a folded-plate vortex assembly (9), a modular vortex assembly (10), and an inclined plate assembly (11). The outer shell (1) comprises a first cylindrical barrel (1.1) and a first conical barrel (1.2) with a wide upper part and a narrow lower part and a closed lower end, which are arranged in series from top to bottom; the first cylindrical barrel (1.1) is provided with a first containing cavity (1.3); the first conical barrel (1.2) is provided with a second containing cavity (1.4) in communication with the first containing cavity (1.3); the discharge port (7) is in communication with the second containing cavity (1.4); the upper part of the first containing cavity (1.3) is provided with a water collecting groove (4). The middle shell (2) comprises a second cylindrical barrel (2.1) and a second conical barrel (2.2) with a wide upper part and a narrow lower part and an open lower end, which are arranged in series from top to bottom; the second cylindrical barrel (2.1) is provided with a third containing cavity (2.3); the second conical barrel (2.2) is provided with a fourth containing cavity (2.4) in communication with the third containing cavity (2.3); the upper end of the second conical barrel (2.2) is located in the first containing cavity (1.3) and the lower end thereof is located in the second containing cavity (1.4). The inner shell (3) comprises a third cylindrical barrel (3.1) arranged in the third containing cavity (2.3); the third cylindrical barrel (3.1) comprises a fifth containing cavity (3.2) with openings at both upper and lower ends. The fifth containing cavity (3.2) forms a first water flow upward channel (A); a water flow downward channel (B) is formed between the inner wall of the second cylindrical barrel (2.1) and the outer wall of the third cylindrical barrel (3.1); the inner wall of the first containing cavity (1.3), the inner wall of the second containing cavity (1.4), the outer wall of the third containing cavity (2.3), the outer wall of the fourth containing cavity (2.4), and the water collecting groove (4) together form a second water flow upward channel (C); the push-flow stirring assembly (8) and the folded-plate vortex assembly (9) are arranged in the first water flow upward channel (A) from top to bottom; the modular vortex assembly (10) is arranged in the water flow downward channel (B); and the inclined plate assembly (11) is arranged in the second water flow upward channel (C). The water inlet pipe (5) penetrates the side wall of the first cylindrical barrel (1.1) and the side wall of the second cylindrical barrel (2.1) and is inserted into the upper part of the first water flow upward channel (A); the water outlet end of the water inlet pipe (5) is lower than the position of the water collecting groove (4); and the water outlet pipe (6) is in communication with the water collecting groove (4).

2. The phosphorus recovery apparatus according to claim 1, characterized by The upper end of the first cylindrical barrel (1.1) is provided with an opening, and a detachable cover plate (1.5) is arranged at the opening.

3. The phosphorus recovery device according to claim 2, characterized in that, The push-flow stirring assembly (8) comprises a stirring power source (8.1), a stirring shaft (8.2) and stirring blades (8.3), the stirring power source (8.1) is arranged on the detachable cover plate (1.5), the connecting end of the stirring shaft (8.2) is connected with the output end of the stirring power source (8.1), and the stirring blades (8.3) are arranged on the free end of the stirring shaft (8.2); the water outlet end of the water inlet pipe (5) is located 20-50 cm above the stirring blades (8.3).

4. The phosphorus recovery device according to any one of claims 1 to 3, characterized in that, The folding plate vortex assembly (9) is located directly below the push-flow stirring assembly (8), and the folding plate vortex assembly (9) comprises first folding plates (9.1) and second folding plates (9.2) arranged side by side, the first folding plates (9.1) comprise a plurality of connecting plates (a) connected in sequence, and the included angle α between adjacent two connecting plates (a) is 80°-100°.

5. The phosphorus recovery device according to claim 4, characterized in that, The top end of the folding plate vortex assembly (9) is 0.4-0.8 m away from the lower edge of the push-flow stirring assembly (8), and the lower end is flush with the lower end of the fifth containing cavity (3.2); the first folding plates (9.1) and the second folding plates (9.2) are arranged alternately; the first folding plates (9.1) and the second folding plates (9.2) are mirror image structures.

6. The phosphorus recovery apparatus according to any one of claims 1 to 3, characterized by The upper end of the modular vortex assembly (10) is located below the liquid surface in the first containing cavity (1.3) by 0.5 m, and the lower end is 0.4-0.8 m away from the lower end of the first containing cavity (1.3); the shape of the modular vortex assembly (10) is a fan ring columnar cube, and the horizontal projection is a fan ring shape.

7. The phosphorus recovery device according to claim 6, characterized in that The modular vortex assembly (10) comprises a plurality of vortex monomers arranged in layers or at intervals, and the vortex monomer is a hollow columnar body enclosed by a first vertical plate (10.1), a second vertical plate (10.2), an upper arc-shaped outer frame (10.3), an upper arc-shaped inner frame (10.4), a lower arc-shaped outer frame (10.5) and a lower arc-shaped inner frame (10.6).

8. The phosphorus recovery device according to claim 7, characterized by The vortex monomer is provided with a vortex sheet, and the cross section of the vortex sheet is at least one of a triangle, a semicircle and a rectangle.

9. The phosphorus recovery device according to any one of claims 1 to 3, characterized by The inclined plate assembly (11) comprises a plurality of sedimentation inclined plates arranged side by side, the sedimentation inclined plates are arranged at an angle with the inner wall of the first containing cavity, and the inclined plate assembly (11) is located in the middle and lower part of the first containing cavity.

10. The phosphorus recovery device according to any one of claims 1 to 3, characterized by The size of the opening of the second conical cylinder (2.2) is 0.3-0.6 times the size of the fifth containing cavity (3.2); the first columnar cylinder (1.1), the first conical cylinder (1.2), the second columnar cylinder (2.1), the second conical cylinder (2.2) and the third columnar cylinder (3.1) are arranged on the same central axis.

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