Domestic sewage dephosphorization and purification device

Abstract

The invention discloses a dephosphorization and purification device for domestic sewage. The dephosphorization and purification device comprises a purification box, a stirring assembly and a filtering assembly, a stirring cavity and a filtering cavity are formed in the purification box, the stirring assembly comprises a rotating disc, a rotating support, an outer side stirring frame and an inner side stirring blade, the rotating disc drives the outer side stirring frame and the inner side stirring blade to rotate, and stirring and mixing operation of sewage in the stirring cavity and a phosphorus removal agent is achieved; the filtering assembly comprises a filtering net, a filtering disc and a limiting ring, large-particle impurities in sewage are preliminarily filtered through the filtering net, meanwhile, water flow with flocculent precipitates treated by the phosphorus removal agent is filtered again through the filtering disc, and finally the treated water flow enters the lower end of the filtering disc and is discharged; the domestic sewage treatment device realizes efficient purification treatment of domestic sewage, has remarkable economic, environmental and social benefits, is suitable for various sewage treatment scenes, and has a wide application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a domestic sewage dephosphorization and purification device. Background Art

[0002] With the acceleration of urbanization and the improvement of people's living standards, the discharge of domestic sewage is increasing. Domestic sewage contains a large amount of phosphorus, which mainly comes from human feces, detergents, etc. Phosphorus is one of the main elements of eutrophication of water bodies. Excessive phosphorus entering the water body will cause excessive growth of algae and other aquatic plants, destroy the water ecological balance, and affect the utilization of water resources. Therefore, it is very important to effectively remove phosphorus from sewage.

[0003] The existing sewage phosphorus removal devices have some shortcomings in practical applications. On the one hand, the mixing effect of phosphorus removal agents and sewage is not ideal, resulting in low phosphorus removal efficiency and failure to fully exert the role of the agents, affecting the effect of sewage treatment; on the other hand, there is a lack of effective classification treatment mechanism for various impurities in sewage, which interferes with the subsequent treatment process and increases the maintenance cost and operation difficulty of the equipment.

[0004] Therefore, it is necessary to develop an efficient, low-cost, easy-to-operate domestic sewage phosphorus removal and purification device to solve the above problems, improve the efficiency and quality of sewage phosphorus removal, and achieve effective graded treatment of impurities in sewage. Summary of the invention

[0005] The object of the present invention is to provide a domestic sewage dephosphorization purification device to solve the problems in the prior art of insufficient mixing of dephosphorization agents with sewage and inability to effectively grade and treat impurities in sewage.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a domestic sewage phosphorus removal purification device, comprising a purification box, a stirring component and a filtering component;

[0007] The upper end of the purification box is sealed by a box cover, and the lower end of the purification box is supported by a support column. A stirring chamber and a filter chamber are respectively provided inside the purification box, and the stirring chamber and the filter chamber are layered by a partition plate. The stirring chamber is located at the lower end of the filter chamber, and the stirring component is located inside the stirring chamber, and the filter component is located inside the filter chamber; the stirring chamber and the filter chamber are connected to each other through a conveying pipe provided in the middle of the purification box, and the conveying pipe passes through the partition plate;

[0008] The stirring assembly comprises a rotating disk, a rotating bracket, an outer stirring rack and an inner stirring blade, the rotating disk is located at the bottom end of the purification box, the lower end of the rotating bracket is connected to the upper surface of the rotating bracket, the rotating bracket is sleeved on the outer wall of the conveying pipe, several groups of the outer stirring racks are located on the outside of the rotating bracket, and fit with the inner wall contour of the purification box, the lower end of the outer stirring rack is connected to the rotating disk, several groups of the inner stirring blades are located on the outside of the rotating bracket, and the tail end of the inner stirring blade is connected to the outer wall of the rotating bracket, and the outer stirring rack, the inner stirring blade and the rotating bracket are all rotated synchronously with the rotating disk at the lower end, and the outer stirring rack and the inner stirring blade are driven to rotate by the rotating disk, so as to realize the stirring and mixing operation of the sewage and the dephosphorization agent in the stirring chamber;

[0009] The filter assembly includes a filter screen, a filter disc and a limiting ring, the limiting ring is located around the inner wall of the filter cavity, the filter screen and the filter disc are located inside the filter cavity from top to bottom, and the filter screen and the outer sides of the filter disc are respectively engaged with the limiting rings, thereby re-stratifying the inside of the filter cavity, and preliminarily filtering large particles of impurities in the sewage through the filter screen, and re-filtering the water flow with flocculent sediments treated with a dephosphorization agent through the filter disc on the lower layer, and finally the water flow after graded filtration will enter the lower end of the filter disc and be discharged, and the filter screen and the filter disc can be replaced in time.

[0010] Preferably, a conveying assembly is provided inside the conveying pipe, and the conveying assembly includes a rotating rod and a spiral blade. The rotating rod is vertically located inside the conveying pipe, and the upper end of the rotating rod is rotatably connected to a box cover provided on the top of the purification box, the spiral blade is installed on the outer wall of the rotating rod, and the outer wall of the spiral blade is in contact with the inner wall of the conveying pipe. A water inlet is provided at the lower end of the conveying pipe, and a water outlet is provided at the upper end of the conveying pipe. The rotation of the rotating rod will drive the spiral blade to rotate together, thereby conveying the sewage and flocculent sediment inside the stirring chamber along the conveying pipe to the water outlet at the upper end for filtration treatment.

[0011] Preferably, the lower end of the purification box is conical in shape, so that large particles and flocculent sediments in the sewage are concentrated at the water inlet at the lower end of the conveying pipe, which is convenient for conveying to the inside of the filter chamber at the upper end. The mixed liquid is stirred a second time inside the conveying pipe through the spiral blades, so that the phosphorus removal agent and sewage are fully mixed, thereby enhancing the phosphorus removal effect.

[0012] Preferably, a driving motor is provided at the lower end of the purification box, and the output end of the driving motor is connected to the lower end of the rotating disk. The driving motor drives the rotating disk to rotate, and the rotating disk will respectively drive the outer stirring frame, the inner stirring blade and the rotating rod to rotate synchronously.

[0013] Preferably, a square slot is provided at the center of the upper end surface of the rotating disk, and a square block is provided at the lower end of the rotating rod. The square slot and the square block engage with each other, thereby realizing synchronous rotation of the rotating rod and the rotating disk.

[0014] Preferably, the outer wall surfaces of the outer stirring frame are respectively provided with long grooves, which are connected to the scrapers provided through the long grooves, and then the inner wall of the purification box is scraped and cleaned by the scrapers, so as to achieve the cleaning of the inner wall of the purification box.

[0015] Preferably, an exhaust port is provided at the upper end of the box cover, and a deodorizing layer and an exhaust fan are provided inside the exhaust port respectively. The deodorizing layer is located at the lower end of the exhaust fan, and the gas inside the purification box is discharged through the exhaust fan and filtered through the deodorizing layer.

[0016] Preferably, a water inlet and a drain outlet are respectively provided on one side of the purification box, the water inlet is communicated with the stirring chamber inside the purification box, the sewage to be treated is transported into the purification box through the water inlet, and the drain outlet is communicated with the lower end of the filter chamber inside the purification box, and the filtered water in the filter chamber is discharged through the drain outlet.

[0017] Preferably, the outer wall of the purification box is provided with a dosing port, the dosing port is communicated with the inside of the stirring chamber, and the dephosphorization agent is added into the stirring chamber through the dosing port.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In the present invention, a stirring assembly is provided, and all-round stirring of sewage is achieved through the coordinated work of a rotating disk, a rotating bracket, an outer stirring frame and an inner stirring blade in the stirring assembly. The outer stirring frame fits the inner wall of the purification box to avoid dead corners of stirring; the inner stirring blade stirs the central area to ensure that the sewage and the phosphorus removal agent are fully mixed, thereby improving the phosphorus removal effect. At the same time, the spiral blade performs secondary stirring in the conveying pipeline to further enhance the mixing effect and ensure that the phosphorus element is completely removed. At the same time, a graded filtration design of a filter net and a filter disc is adopted in the filter assembly. Large particles of impurities are first intercepted by the filter net, and then flocculent sediments are intercepted by the filter disc, ensuring that the sewage reaches a higher purification standard after layer-by-layer filtration and meets environmental emission requirements.

[0020] 2. The present invention adopts a modular design. The filter screen and filter disc are connected with the limit ring by snap-fitting, which is convenient for disassembly and replacement, reducing the difficulty and cost of maintenance. At the same time, the scraper design on the outer stirring frame can automatically clean the inner wall of the purification box, reducing the frequency of manual cleaning. At the same time, the driving motor drives the rotating disc, stirring component and conveying component to operate synchronously, realizing the automated operation of sewage treatment, reducing manual intervention and improving operation efficiency.

[0021] 3. In the present invention, an exhaust port and a deodorizing layer are provided on the box cover, which can timely discharge the odorous gas generated in the purification box and filter it through the deodorizing layer to avoid pollution to the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0023] In the attached picture:

[0024] Figure 1 It is a schematic diagram of the overall structure of the domestic sewage phosphorus removal and purification device of the present invention;

[0025] Figure 2 It is a schematic diagram of the internal structure of the domestic sewage phosphorus removal and purification device of the present invention;

[0026] Figure 3 is a side cross-sectional view of the purification box of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the stirring assembly and the filtering assembly of the present invention;

[0028] Figure 5 It is a partial structural schematic diagram of the stirring assembly of the present invention;

[0029] Figure 6 It is a structural schematic diagram of the conveying assembly of the present invention;

[0030] Numbers in the figure: 1, purification box; 101, box cover; 102, support column; 103, stirring chamber; 104, filter chamber; 105, partition plate; 106, conveying pipe; 107, driving motor; 108, exhaust port; 109, deodorization layer; 110, exhaust fan; 111, water inlet; 112, water outlet; 113, dosing port; 201, rotating disk; 202, rotating bracket; 203, outer stirring frame; 204, inner stirring blade; 205, long groove; 206, scraper; 301, filter screen; 302, filter disk; 303, limit ring; 401, rotating rod; 402, spiral blade; 403, water inlet; 404, water outlet; 405, square slot; 406, square block. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0032] Example: Figure 1-Figure 3 As shown, the present invention proposes an innovative domestic sewage phosphorus removal and purification device, which is composed of a purification box 1, a stirring component, a filtering component and other multiple components working in coordination, and can efficiently remove phosphorus elements in domestic sewage to achieve sewage purification;

[0033] The upper end of the purification box 1 is sealed by a box cover 101. On the one hand, it can effectively prevent the sewage from leaking due to volatilization, splashing, etc. during the treatment process, avoiding harm to the surrounding environment and the health of operators; on the other hand, the sealed environment helps to maintain the pressure stability inside the purification box 1, creating stable working conditions for the subsequent stirring and filtering processes, and ensuring that each treatment link can proceed smoothly; the lower end of the purification box 1 is supported by a support column 102, and a stirring chamber 103 and a filtering chamber 104 are respectively provided inside the purification box 1, and the stirring chamber 103 and the filtering chamber 104 are layered by a partition plate 105 The stirring chamber 103 is located at the lower end of the filter chamber 104, and the stirring component is located inside the stirring chamber 103, and the filter component is located inside the filter chamber 104; the stirring chamber 103 and the filter chamber 104 are interconnected through a conveying pipe 106 provided in the middle of the purification box 1, providing a channel for the smooth transfer of sewage between the two chambers, and the conveying pipe 106 passes through the partition plate 105; this layered arrangement is in line with the process flow of sewage purification, the sewage is first fully mixed and reacted with the dephosphorization agent in the stirring chamber 103, and then conveyed to the filter chamber 104 for filtration treatment, so that the entire purification process is carried out in an orderly manner.

[0034] like Figure 2-Figure 6 As shown, the stirring assembly is located inside the stirring chamber 103, and is a key component for achieving sufficient mixing of sewage and dephosphorization agent. The stirring assembly includes a rotating disk 201, a rotating bracket 202, an outer stirring bracket 203, and an inner stirring blade 204. The rotating disk 201 is located at the bottom of the purification box 1 and is the power source of the entire stirring assembly. A driving motor 107 is provided at the lower end of the purification box 1, and the output end of the driving motor 107 is connected to the lower end of the rotating disk 201. When the driving motor 107 is started, it can provide stable power to the rotating disk 201, so that it rotates at a set speed. This power transmission method ensures the stability of the rotation of the rotating disk 201 and provides reliable power support for subsequent stirring operations.

[0035] The lower end of the rotating bracket 202 is connected to the upper surface of the rotating disk 201, and the rotating bracket 202 is sleeved on the outer wall of the conveying pipe 106. This connection method ensures the stability of the rotating bracket 202, so that it can rotate synchronously with the rotation of the rotating disk 201, and provide support for the movement of the outer stirring rack 203 and the inner stirring blade 204. Several groups of outer stirring racks 203 are located outside the rotating bracket 202 and fit each other with the inner wall contour of the purification box 1. The lower end of the outer stirring rack 203 is connected to the rotating disk 201. When the rotating disk 201 rotates, the outer stirring rack 203 rotates accordingly, and a strong stirring effect is generated on the sewage near the box wall inside the stirring chamber 103. This design can effectively avoid the formation of a stirring dead angle of sewage near the box wall, ensure that the sewage inside the stirring chamber 103 can be fully stirred, so that the sewage and the dephosphorization agent are evenly mixed, and the reaction efficiency of the dephosphorization agent is improved. Several groups of inner stirring blades 204 are located outside the rotating bracket 202, and the tail ends of the inner stirring blades 204 are connected to the outer wall of the rotating bracket 202. The inner stirring blades 204 mainly stir the sewage in the central area inside the stirring chamber 103, and cooperate with the outer stirring frame 203 to form an all-round stirring effect. When the rotating disk 201 drives the rotating bracket 202 to rotate, the inner stirring blades 204 generate strong vortices in the sewage, further promoting the mixing of the sewage and the phosphorus removal agent, so that the phosphorus removal agent can fully react chemically with the phosphorus element in the sewage to generate flocculent precipitates, thereby achieving the purpose of removing the phosphorus element.

[0036] In addition, the outer wall surface of the outer stirring frame 203 is respectively provided with a long groove 205, which is connected to the scraper 206. During the stirring process, the scraper 206 will scrape and wash the inner wall of the purification box 1 as the outer stirring frame 203 rotates, and can timely remove dirt and impurities attached to the inner wall of the purification box 1 to prevent their accumulation from affecting the stirring effect and the service life of the device, thereby achieving the cleaning treatment of the inner wall of the purification box 1 and maintaining the cleanliness of the inside of the purification box 1;

[0037] like Figure 2-Figure 6 As shown, the filter assembly is located inside the filter cavity 104, including a filter screen 301, a filter disc 302, and a stop ring 303. The stop ring 303 surrounds the inner wall of the filter cavity 104 to provide stable support and positioning for the filter screen 301 and the filter disc 302. The filter screen 301 and the filter disc 302 are located inside the filter cavity 104 from top to bottom, and the filter screen 301 and the outer sides of the filter disc 302 are respectively engaged with the stop ring 303. This engagement design not only facilitates the installation and disassembly of the filter screen 301 and the filter disc 302, but also ensures that they will not shift or shake during the filtering process, thereby ensuring the stability of the filtering effect.

[0038] The filter net 301 mainly performs preliminary filtering of large particles of impurities in the sewage. When the sewage enters the filter chamber 104 from the stirring chamber 103 through the conveying pipe 106, it first passes through the filter net 301. Its larger aperture can effectively intercept large particles of impurities such as leaves and plastic fragments in the sewage, prevent these impurities from entering the subsequent filtering links, avoid clogging the filter disc 302, and extend the service life of the filter disc 302. The sewage that has been initially filtered by the filter net 301 continues to flow downward and reaches the filter disc 302 at the lower layer. The aperture of the filter disc 302 is relatively small, and it mainly filters the flocculent precipitates produced in the sewage after being treated with the dephosphorization agent. In the stirring chamber 103, the flocculent precipitates generated after the sewage and the dephosphorization agent fully react will flow into the filter chamber 104 together with the sewage. The filter disc 302 can effectively intercept these flocculent precipitates, so that the sewage is further purified.

[0039] Finally, the water flow after graded filtration from large to small will enter the lower end of the filter disc 302 and be discharged. This graded filtration method can effectively improve the filtration effect of sewage and ensure that the discharged water flow meets the relevant environmental protection standards. At the same time, since the filter net 301 is connected with the filter disc 302 and the limit ring 303 by snap-fit ​​connection, when they are blocked or damaged after long-term use, they can be easily removed from the filter chamber 104 for cleaning or replacement, ensuring the continuous and stable operation of the entire device.

[0040] like Figure 6As shown, a conveying assembly is provided inside the conveying pipe, and the conveying assembly includes a rotating rod 401 and a spiral blade 402. The rotating rod 401 is vertically located inside the conveying pipe, and the upper end of the rotating rod 401 is rotatably connected to the box cover 101 provided on the top of the purification box 1, thereby ensuring the stability and flexibility of the rotating rod 401 during the rotation process. The spiral blade 402 is installed on the outer wall of the rotating rod 401, and the outer wall of the spiral blade 402 is in contact with the inner wall of the conveying pipe 106. The conveying pipe 106 is provided with a water inlet 403 at the lower end and a water outlet 404 at the upper end. The rotation of the rotating rod 401 will drive the spiral blade 402 to rotate together, thereby transporting the sewage and flocculent sediment inside the stirring chamber 103 along the conveying pipe 106 to the water outlet 404 at the upper end, and entering the filter chamber 104 for filtration treatment. Wherein, the lower end of the purification box 1 is in a cone shape, and this design makes the large particles and flocculent sediments in the sewage naturally concentrate to the water inlet 403 at the lower end of the conveying pipe 106 under the action of gravity, so as to be convenient for conveying to the inside of the filter chamber 104 at the upper end. At the same time, the mixed liquid is stirred twice inside the conveying pipe by the spiral blade 402, so that the phosphorus removal agent is fully mixed with the sewage, further enhancing the phosphorus removal effect, and ensuring that the phosphorus element in the sewage can be more thoroughly removed. In order to realize the synchronous rotation of the rotating rod 401 and the rotating disk 201, a square slot 405 is provided at the center position of the upper end surface of the rotating disk 201, and a square block 406 is provided at the lower end of the rotating rod 401, and the square slot 405 and the square block 406 are mutually engaged. This engagement design has a simple structure, can ensure the transmission accuracy and stability between the rotating rod 401 and the rotating disk 201, so that the conveying component and the stirring component can work together, and ensure the continuity and efficiency of the stirring and conveying process of the sewage.

[0041] Specifically, an exhaust port 108 is provided at the upper end of the box cover 101, and a deodorizing layer 109 and an exhaust fan 110 are provided inside the exhaust port 108, respectively. The deodorizing layer 109 is located at the lower end of the exhaust fan 110. During the sewage purification process, some odorous gases may be generated. Through the operation of the exhaust fan 110, the gas inside the purification box 1 can be discharged in time to maintain the circulation of the air inside the purification box 1. At the same time, the exhausted gas is filtered and processed by the deodorizing layer 109, which can effectively remove the odor, avoid adverse effects on the surrounding environment, and protect the surrounding environment and the health of personnel.

[0042] Specifically, a water injection port 111 and a water discharge port 112 are provided on one side of the purification box 1. The water injection port 111 is interconnected with the stirring chamber 103 inside the purification box 1, and the sewage to be treated can be stably transported into the purification box 1 through the water injection port 111, providing a stable water supply for the sewage purification process. The water discharge port 112 is interconnected with the lower end of the filter chamber 104 inside the purification box 1, and the filtered water in the filter chamber 104 is discharged through the water discharge port 112, thereby realizing the sewage purification and discharge process. A drug injection port 113 is provided on the outer wall of the purification box 1, and the drug injection port 113 is interconnected with the inside of the stirring chamber 103. A dephosphorization agent is added into the stirring chamber 103 through the drug injection port 113 to ensure that the sewage and the dephosphorization agent can be mixed and reacted in a suitable proportion to improve the dephosphorization effect.

[0043] In summary, the domestic sewage phosphorus removal and purification device of the present invention realizes efficient phosphorus removal and purification of domestic sewage through the coordinated work of various components. The device has a reasonable structure, convenient operation, good purification effect, can effectively solve the problem of phosphorus pollution in domestic sewage, and has broad application prospects.

[0044] Specific working steps:

[0045] First, the domestic sewage to be treated is transported to the inside of the stirring chamber 103 of the purification box 1 through the water injection port 111. Then, an appropriate amount of dephosphorization agent is added into the stirring chamber 103 through the dosing port 113. The drive motor 107 is started, and the drive motor 107 drives the rotating disk 201 to rotate. While the rotating disk 201 rotates, it drives the rotating bracket 202 connected thereto to rotate, thereby causing the outer stirring frame 203 and the inner stirring blade 204 installed on the rotating bracket 202 to rotate synchronously. The outer stirring frame 203 stirs the sewage near the box wall of the stirring chamber 103, and the inner stirring blade 204 stirs the sewage in the central area of ​​the stirring chamber 103. The two cooperate with each other to fully mix the sewage and the dephosphorization agent, and a chemical reaction occurs to generate flocculent precipitates. During the rotation of the rotating disk 201, since the rotating disk 201 and the rotating rod 401 are connected by the engagement of the square card slot 405 and the square card block 406, the rotating rod 401 will also rotate synchronously. The rotating rod 401 drives the spiral blade 402 to rotate. Under the action of the spiral blade 402, the sewage and flocculent sediment inside the stirring chamber 103 are transported upward to the filter chamber 104 along the conveying pipe 106. During the transportation process, the conical design of the lower end of the purification box 1 makes the large particles and flocculent sediment in the sewage concentrate at the water inlet 403 at the lower end of the conveying pipe 106, which is convenient for transportation. At the same time, the mixed liquid is stirred twice inside the conveying pipe by the spiral blade 402 to further enhance the phosphorus removal effect. The sewage entering the filter chamber 104 first passes through the filter net 301, and the filter net 301 intercepts large particles of impurities in the sewage. Then, the sewage continues to flow downward, passes through the filter disc 302, and the filter disc 302 intercepts the impurities with flocculent sediment, so as to achieve the re-filtration of the sewage. The water flow after graded filtration enters the lower end of the filter disc 302, and is discharged from the purification box 1 through the drain port 112, completing the phosphorus removal and purification process of domestic sewage. During the operation of the device, the exhaust fan 110 works continuously to exhaust the odorous gas generated inside the purification box 1, and after being filtered by the deodorizing layer 109, it avoids odor pollution to the surrounding environment. As the device is running, if the filter 301 or the filter disc 302 is found to be blocked or damaged, it can be easily removed from the filter cavity 104 for cleaning or replacement. At the same time, the scraper 206 on the outer stirring frame 203 will scrape and wash the inner wall of the purification box 1 during the stirring process to keep the inside of the purification box 1 clean.

[0046] Through the above specific implementation methods, the domestic sewage phosphorus removal and purification device of the present invention can efficiently and stably realize the phosphorus removal and purification treatment of domestic sewage, achieving good environmental protection effects.

[0047] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A domestic sewage phosphorus removal and purification device, characterized in that: It includes a purification box, a stirring component and a filtering component; The upper end of the purification box is sealed by a box cover, and the lower end of the purification box is supported by a support column. A stirring chamber and a filter chamber are respectively provided inside the purification box. The stirring chamber and the filter chamber are layered by a partition plate. The stirring chamber is located at the lower end of the filter chamber, and the stirring component is located inside the stirring chamber, and the filter component is located inside the filter chamber; the stirring chamber and the filter chamber are connected to each other through a conveying pipe provided in the middle of the purification box; The stirring assembly comprises a rotating disk, a rotating bracket, an outer stirring rack and an inner stirring blade, the rotating disk is located at the bottom end of the purification box, the lower end of the rotating bracket is connected to the upper surface of the rotating bracket, the rotating bracket is sleeved on the outer wall of the conveying pipe, several groups of the outer stirring racks are located on the outside of the rotating bracket, and fit with the inner wall contour of the purification box, the lower end of the outer stirring rack is connected to the rotating disk, several groups of the inner stirring blades are located on the outside of the rotating bracket, and the tail end of the inner stirring blade is connected to the outer wall of the rotating bracket, and the outer stirring rack, the inner stirring blade and the rotating bracket are all rotated synchronously with the rotating disk at the lower end, and the outer stirring rack and the inner stirring blade are driven to rotate by the rotating disk, so as to realize the stirring and mixing operation of the sewage and the dephosphorization agent in the stirring chamber; The filter assembly includes a filter screen, a filter plate and a limiting ring, the limiting ring is located around the inner wall of the filter cavity, the filter screen and the filter plate are located inside the filter cavity from top to bottom, and the filter screen and the outer sides of the filter plate are respectively engaged with the limiting rings, thereby re-stratifying the inside of the filter cavity, and preliminarily filtering large particles of impurities in the sewage through the filter screen, and re-filtering the water flow with flocculent sediments after being treated with a dephosphorization agent through the filter plate on the lower layer, and finally the water flow after graded filtration will enter the lower end of the filter plate and be discharged.

2. A domestic sewage phosphorus removal and purification device according to claim 1, characterized in that: A conveying assembly is provided inside the conveying pipe, and the conveying assembly includes a rotating rod and a spiral blade. The rotating rod is vertically located inside the conveying pipe, and the upper end of the rotating rod is rotatably connected to the box cover provided on the top of the purification box. The spiral blade is installed on the outer wall of the rotating rod, and the outer wall of the spiral blade is in contact with the inner wall of the conveying pipe. A water inlet is provided at the lower end of the conveying pipe, and a water outlet is provided at the upper end of the conveying pipe. The rotation of the rotating rod will drive the spiral blade to rotate together, thereby conveying the sewage and flocculent sediment in the stirring chamber along the conveying pipe to the water outlet at the upper end for filtration treatment.

3. A domestic sewage phosphorus removal and purification device according to claim 2, characterized in that: The lower end of the purification box is conical in shape, so that large particles and flocculent sediments in the sewage are concentrated at the water inlet at the lower end of the conveying pipe, which is convenient for conveying to the filter chamber at the upper end. The mixed liquid is inside the conveying pipe and is stirred for the second time by the spiral blades to fully mix the phosphorus removal agent with the sewage.

4. A domestic sewage phosphorus removal and purification device according to claim 1, characterized in that: A driving motor is provided at the lower end of the purification box, and the output end of the driving motor is connected to the lower end of the rotating disk. The driving motor drives the rotating disk to rotate, and the rotating disk will respectively drive the outer stirring frame, the inner stirring blade and the rotating rod to rotate synchronously.

5. A domestic sewage phosphorus removal and purification device according to claim 1, characterized in that: A square slot is provided at the center of the upper surface of the rotating disk, and a square block is provided at the lower end of the rotating rod. The square slot and the square block are engaged with each other, thereby realizing synchronous rotation of the rotating rod and the rotating disk.

6. A domestic sewage phosphorus removal and purification device according to claim 1, characterized in that: The outer wall surfaces of the outer stirring racks are respectively provided with long grooves, which are connected to the scrapers provided through the long grooves, and then the inner wall of the purification box is scraped and cleaned through the scrapers.

7. A domestic sewage phosphorus removal and purification device according to claim 1, characterized in that: An exhaust port is provided at the upper end of the box cover, and a deodorizing layer and an exhaust fan are provided inside the exhaust port respectively. The deodorizing layer is located at the lower end of the exhaust fan, and the gas inside the purification box is discharged through the exhaust fan and filtered through the deodorizing layer.

8. The domestic sewage phosphorus removal and purification device according to claim 1, characterized in that: A water inlet and a drain outlet are respectively provided on one side of the purification box. The water inlet is communicated with the stirring chamber inside the purification box, and the sewage to be treated is transported into the purification box through the water inlet. The drain outlet is communicated with the lower end of the filter chamber inside the purification box, and the filtered water in the filter chamber is discharged through the drain outlet.

9. A domestic sewage phosphorus removal and purification device according to claim 1, characterized in that: The outer wall of the purification box is provided with a drug-feeding port, which is communicated with the inside of the stirring chamber, and the dephosphorization agent is fed into the stirring chamber through the drug-feeding port.

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