Experimental device and method for determining phosphorus removal performance of adsorbent under continuous flow working condition

Abstract

The invention relates to an experimental device and method for determining the phosphorus removal performance of an adsorbent under a continuous flow working condition, the experimental device comprises a primary sedimentation tank, a filter column, a phosphorus removal tank, a magnetized secondary sedimentation tank and the like, a peristaltic pump, a driving motor, a water pump and other parts are arranged, a magnetic particle recovery mechanism and the like are equipped, and La-ATP / SA particles and a powdery LaFeO-U composite material are used as the adsorbent; the test method comprises the steps of pretreatment, adsorption and phosphorus removal by a powdery phosphorus removal adsorbent, adsorption and phosphorus removal by a granular phosphorus removal adsorbent and the like, and sampling points are arranged at multiple positions. According to the method, the effects of measuring the dynamic adsorption performance of the powdery and granular phosphorus removal adsorbents under the continuous flow working condition, separating the magnetic powder adsorbent to reduce secondary pollution, recycling the adsorbent to reduce resource waste, accurately calculating the pollutant removal rate of each link and the like are achieved.

Description

Technical Field

[0001] This application relates to the field of water adsorption and phosphorus removal technology, and in particular to an experimental apparatus and method for determining the phosphorus removal performance of adsorbents under continuous flow conditions. Background Technology

[0002] Eutrophication is a major water environment problem facing the world today. Phosphorus, as the limiting nutrient element in eutrophication, can cause a series of environmental problems, such as abnormal algal proliferation, reduced dissolved oxygen in water, and imbalance of aquatic ecosystems, when it is discharged in excess. These problems seriously threaten drinking water safety and aquatic ecological health. Therefore, the development of efficient, stable and economical phosphorus removal technologies has become a key research focus and an essential requirement for industrial applications in the field of water environment management.

[0003] Adsorption phosphorus removal technology has become one of the mainstream technologies in the field of water phosphorus removal due to its advantages of low cost, simple operation, high treatment efficiency, and no secondary pollution. The core principle of this technology is to use adsorbent materials with high porosity and large specific surface area to fix phosphate ions in the water onto the surface of the adsorbent through mechanisms such as electrostatic interaction, ligand exchange, surface complexation, and precipitation reaction, thereby achieving efficient removal of phosphorus from the water.

[0004] At present, significant progress has been made in the research on phosphorus removal adsorbents. In existing technologies, researchers have conducted extensive laboratory analyses of the adsorption efficiency, phosphorus removal mechanism, and influencing factors of powdered and granular phosphorus removal adsorbents under static adsorption conditions. This has clarified the effects of factors such as the physicochemical properties of the adsorbent itself, the pH value of the water, the initial phosphorus concentration, and the reaction temperature on the static adsorption effect.

[0005] However, most existing studies focus on static adsorption conditions in the laboratory, and there is a serious lack of research on continuous flow treatment scenarios. This has resulted in significant deficiencies in key parameters such as mass transfer parameters, dynamic adsorption kinetics, and the performance degradation of adsorbents over long-term operation. In particular, there is a lack of research on dynamic adsorption in real-world aquatic environments, such as complex water quality environments like natural surface water and domestic sewage effluent, as well as in scenarios with large treatment scales and long operating cycles.

[0006] Meanwhile, as the requirements for eutrophication control of water bodies continue to increase, different application scenarios (such as landscape water body restoration, municipal sewage deep treatment, drinking water source pretreatment, etc.) have diversified requirements for the treatment efficiency, operational stability, and material lifespan of phosphorus removal technology. How to develop adsorption phosphorus removal technology that is suitable for continuous flow conditions and fully explore the dynamic adsorption phosphorus removal efficiency of adsorption materials has become the core issue for breaking through existing technical bottlenecks, improving water purification efficiency, and promoting the industrialization of adsorption phosphorus removal technology.

[0007] Based on the above situation, there is an urgent need to develop an experimental device that can simulate actual continuous flow conditions for measuring the dynamic adsorption performance of phosphorus removal adsorbents, so as to provide data support and technical basis for the engineering application of adsorption and phosphorus removal materials. Summary of the Invention

[0008] To simulate the dynamic adsorption performance of phosphorus removal adsorbents under actual continuous flow conditions, this application provides an experimental apparatus for measuring the phosphorus removal performance of adsorbents under continuous flow conditions.

[0009] The experimental apparatus provided in this application for determining the phosphorus removal performance of adsorbents under continuous flow conditions adopts the following technical solution: An experimental apparatus for determining the phosphorus removal performance of an adsorbent under continuous flow conditions includes a primary sedimentation tank, an inlet pipe and an outlet pipe connected to the primary sedimentation tank, the inlet pipe being connected to an intensive fishpond, a peristaltic pump connected to the outlet pipe, a first branch pipe connected to the connection between the outlet pipe and the peristaltic pump, a filter column connected to the first branch pipe, attapulgite particles disposed inside the filter column, a water guide pipe connected to the filter column, a phosphorus removal tank connected to the water guide pipe, a magnetic powdered adsorbent disposed in the phosphorus removal tank, a drive motor fixedly connected to the top of the phosphorus removal tank, the output shaft of the drive motor extending into the phosphorus removal tank and fixedly connected to a stirring shaft, a drain pipe connected to the phosphorus removal tank, a magnetic secondary sedimentation tank connected to the drain pipe, a magnetic particle recovery mechanism disposed in the magnetic secondary sedimentation tank, a first reflux pipe disposed at the top of the magnetic secondary sedimentation tank, a circulation pipe disposed at the bottom of the magnetic secondary sedimentation tank, the end of the circulation pipe away from the magnetic secondary sedimentation tank extending into the phosphorus removal tank, and a water pump disposed on the circulation pipe.

[0010] By adopting the above technical solution, when using the system, the water from the intensive fishpond is guided to the primary sedimentation tank through the inlet pipe. Particles larger than 100μm in the water can settle naturally. The water after sedimentation is guided to the filter column, which can block suspended solids in the water. The filtered water then enters the phosphate removal tank. The drive motor drives the stirring shaft to rotate, which fully stirs the magnetic powder adsorbent in the phosphate removal tank, ensuring that the magnetic powder adsorbent and water are in full contact. The surface of the magnetic powder adsorbent is usually positively charged, while the phosphate ions in the water are negatively charged. They will be quickly adsorbed through electrostatic attraction. The magnetic powder adsorbent is applied to the surface of the material. After the magnetic powder adsorbent comes into full contact with water, it enters the magnetic secondary sedimentation tank through the water guide pipe. The magnetic powder recovery device in the magnetic secondary sedimentation tank separates the magnetic powder from the water and guides the magnetic powder to the phosphorus removal tank through the circulation pipe. On the one hand, the magnetic powder adsorbent is separated from the water body, reducing secondary pollution to the water body. On the other hand, the separated magnetic powder adsorbent is recycled, reducing the waste of resources. The water on the return pipe is sampled and tested, thereby achieving the dynamic adsorption performance determination of the powdered phosphorus removal adsorbent under continuous flow conditions.

[0011] Optionally, the peristaltic pump is connected to a second branch pipe, and a fixed bed adsorption column is fixedly connected to the second branch pipe. The fixed bed adsorption column is filled with granular phosphorus removal adsorbent, and a second reflux pipe is provided on the fixed bed adsorption column.

[0012] By adopting the above technical solution, when the user uses the product, the fish effluent passes through the primary sedimentation tank and the fixed bed adsorption column in sequence to achieve phosphorus adsorption and suspended particle filtration. The dynamic adsorption performance of the granular phosphorus removal adsorbent under continuous flow conditions is investigated, and the phosphorus removal effect of the granular phosphorus removal adsorbent is tested.

[0013] Optionally, the granular phosphorus removal adsorbent is 200ml La-ATP / SA granules, and the magnetic powder adsorbent is a powdered LaFeO-U composite material.

[0014] Optionally, the magnetic particle recovery mechanism includes a recovery sleeve fixedly connected to the magnetized secondary sedimentation tank. A power motor is fixedly connected to the top of the magnetized secondary sedimentation tank. A screw is fixedly connected to the output shaft of the power motor. The screw extends into the recovery sleeve and is rotatably connected to the recovery sleeve. A first permanent magnet is threaded onto the screw. The diameter of the first permanent magnet is the same as the inner diameter of the recovery sleeve.

[0015] By adopting the above technical solution, when the user uses the device, the power motor drives the screw to rotate, and the first permanent magnet slides vertically along the circumference of the screw. The magnetic particles remaining in the water fall to the bottom of the magnetized secondary sedimentation tank under the action of gravity. The remaining magnetic particles are attracted by the first permanent magnet and attach to the outer wall of the recovery sleeve, thereby achieving the separation of the magnetizing powder and water, thus ensuring that the water in the first recovery pipe is clear and transparent.

[0016] Optionally, a scraping ring is fitted on the top of the recycling sleeve, and a second permanent magnet is provided on the side of the scraping ring near the recycling sleeve. A positioning component for fixing the scraping ring is provided on the magnetized secondary sedimentation tank.

[0017] By adopting the above technical solution, when the screw drives the first permanent magnet to slide vertically, and the positioning component removes the restriction on the second permanent magnet, the second permanent magnet and the first permanent magnet move synchronously under the action of magnetic force, that is, drive the scraper ring to slide vertically, scrape off the magnetic particles attached to the recycling sleeve, and finally guide them to the dephosphorization tank for recycling through the circulation pipe.

[0018] Optionally, the positioning component includes a positioning rod fixedly connected to the magnetized secondary sedimentation tank, two guide columns fixedly connected inside the positioning rod, the guide columns being horizontally arranged, and hooks slidably connected to the guide columns. The hooks are used to abut against and support the bottom of the scraper ring. The hooks are made of ferromagnetic material. An electromagnet is fixedly connected inside the positioning rod, and a return spring is fixedly connected to the bottom of the hook. The end of the return spring away from the hook is fixedly connected to the positioning rod.

[0019] By adopting the above technical solution, when the user needs to recycle the material on the recycling sleeve, the electromagnet is energized, the electromagnet attracts the hook, and the hook moves in the direction of the electromagnet. The hook and the scraping ring are separated, so that the scraping ring can follow the vertical movement of the first permanent magnet to scrape the material on the outer wall of the recycling sleeve.

[0020] Optionally, the bottom of the recycling sleeve is provided with a collection cylinder, the bottom of the collection cylinder is provided with a sponge, the top of the collection cylinder is integrally formed with a guide ring, the inner diameter of the guide ring decreases from top to bottom, the top of the guide ring abuts against the inner wall of the magnetized secondary sedimentation tank, and the top of the guide ring has multiple clearance openings along its circumference. The guide cylinder is rotatably connected inside the collection cylinder, a spiral feeding plate is fixedly connected to the guide cylinder, a third permanent magnet is fixedly connected to the inner wall of the guide cylinder, the bottom of the recycling sleeve is provided with a guide assembly for driving the first permanent magnet to rotate, and the circulation pipe is fixedly connected to the bottom of the collection cylinder.

[0021] By adopting the above technical solution, when the user uses it, the sponge supports the bottom of the collecting cylinder. When the scraper ring slides down to scrape the material and squeezes the water flow, the water flows out from the sponge, blocking the magnetic particles in the water flow. When the first permanent magnet slides to the bottom of the screw, the guide component makes the first permanent magnet rotate. The first permanent magnet drives the third permanent magnet to rotate through magnetic force. The third permanent magnet drives the guide cylinder to rotate. The spiral feeding plate guides the collected magnetic particles to the circulation pipe, realizing the collection and recycling of magnetic particles.

[0022] Optionally, the guide assembly includes multiple limiting strips fixedly connected to the inner side wall of the recovery sleeve, with a guide groove formed between adjacent limiting strips. A guide block is fixedly connected to the side wall of the first permanent magnet, and the guide block is slidably connected in the guide groove. A gap is left between the limiting strips and the bottom of the recovery sleeve, and the gap is greater than the height of the first permanent magnet. A guide slope is provided near the bottom of the limiting strips. A return spring is fixedly connected to the bottom of the recovery sleeve. The part of the screw near the gap is not threaded.

[0023] By adopting the above technical solution, when the user operates the device, the power motor rotates in the forward direction, driving the screw to rotate. The guide block and guide groove cooperate to make the first electromagnet slide vertically downward. When the guide block of the first electromagnet disengages from the guide groove, the first electromagnet slides to the bottom of the slide rod. The first electromagnet follows the screw to rotate. The rotation of the first electromagnet can drive the third permanent magnet to rotate through magnetic force. The rotation of the third permanent magnet drives the guide cylinder to rotate, which can guide the collected magnetic particles to the circulation pipe through the spiral feeding plate. The tension of the return spring facilitates pushing the first permanent magnet to reset upward. When the power motor rotates in the reverse direction, it drives the screw to drive the first permanent magnet to rotate in the reverse direction. The guide block is guided into the guide groove through the guide slope, so that the first permanent magnet slides upward along the guide groove. This allows the first electromagnet to have the functions of linear motion to attract electromagnetic particles, rotational motion to feed, and automatic reset.

[0024] A test method for an experimental apparatus for determining the phosphorus removal performance of an adsorbent under continuous flow conditions includes the following steps: S1. Pretreatment: The fish pond effluent is diverted to the primary sedimentation tank. Utilizing the principle of gravity sedimentation, particles with a diameter greater than 100μm in the water can settle naturally, achieving preliminary filtration of the fish pond effluent. Sampling point one is set on the inlet pipe of the primary sedimentation tank. Sampling point one is set as the sampling point at the inlet end to obtain the initial phosphorus concentration of the inlet water, which can be used as a reference for the experiment. Sampling point two is set on the effluent pipe of the primary sedimentation tank. Sampling point two obtains the phosphorus concentration of the effluent after treatment by the primary sedimentation tank. It is mainly used to judge the phosphorus removal effect of the primary sedimentation tank itself. The main function of the primary sedimentation tank is to remove suspended solids, but it will also remove a small amount of phosphorus through the adsorption of suspended solids. This data can help you eliminate the interference of the phosphorus removal effect of the primary sedimentation tank on the performance measurement of the adsorbent. S2. Phosphorus removal by powdered phosphorus adsorbent: The fishpond effluent after primary sedimentation is passed through a powdered phosphorus adsorbent (magnetic LaFeO-U composite material). a1. Filter column for filtering suspended particles: The filter column bed uses attapulgite particles with a particle size of 1-2mm as the core filter material, and fills each end with a 2cm thick layer of glass beads. This not only effectively traps fine suspended particles, but also removes some phosphorus and nitrogen pollutants at the same time. Sampling point three is set after the filter column to obtain data such as the concentration of phosphorus and nitrogen and the content of suspended solids in the filtered water. By comparing these data with the influent index of the filter column, the removal rate of various pollutants by the filter column can be accurately calculated, and it can be determined whether the attapulgite filter media still maintains good adsorption and purification capacity. At the same time, it can also be known whether the retention effect of the glass bead layer meets the standard. a2. Phosphorus removal by adsorption in the phosphorus removal tank: Magnetic LaFeO-U composite material is added to the phosphorus removal tank. The magnetic LaFeO-U composite material relies on its own adsorption or chemical precipitation with phosphorus to drive the motor to rotate the stirring shaft. The stirring shaft can break the static stratification state of the wastewater, allowing the magnetic powder to be evenly dispersed in the wastewater, avoiding the magnetic powder from settling at the bottom of the tank and failing to fully contact the phosphorus in the wastewater, thereby greatly improving the phosphorus removal efficiency of the magnetic powder. a3. Magnetic Powder Recovery and Reuse: Some of the magnetic particles remaining in the water fall to the bottom of the magnetic secondary sedimentation tank under the action of gravity. The remaining magnetic particles are attracted by the first permanent magnet and adhere to the outer wall of the recovery sleeve. The scraper ring scrapes off the larger magnetic particles from the outer wall of the recovery sleeve. The magnetic particles are collected on the spiral feed plate. The first permanent magnet drives the spiral feed plate to rotate, pushing the magnetic particles to the circulation pipe. The circulation pipe guides the magnetic particles to the phosphorus removal tank, realizing the recycling of materials.

[0025] The fourth sampling point in the magnetic secondary sedimentation tank can test the final effluent quality after phosphorus removal treatment. The detection of indicators such as phosphorus concentration, nitrogen concentration, and suspended solids content here can directly confirm whether the treated water quality meets the corresponding effluent requirements. It is the final verification of the treatment effect of the entire phosphorus removal process. S3. Phosphorus removal by granular adsorbent: The fishpond effluent after primary sedimentation is passed through La-ATP / SA (spherical granular adsorbent) adsorption material. a1. Fixed-bed adsorption column filtration for phosphorus removal: La-ATP / SA particles have both filtration and high-efficiency phosphorus removal functions. They are directly used as filter media and filled into a special adsorption column. A 2cm thick layer of glass beads is filled at both ends of the bed to ensure uniform water distribution and prevent filter media loss. Water from the primary sedimentation tank outlet pipe is guided into the fixed-bed adsorption column, where La-ATP / SA particles perform the functions of adsorbing and removing phosphorus and filtering suspended solids. a2. Sampling point five is set on the second return water pipe: Sampling point five can directly reflect the adsorption and treatment capacity of La-ATP / SA particles for phosphorus. By detecting the total phosphorus and dissolved phosphorus concentrations in the water sample and comparing them with the inlet water data sampling point two of the adsorption column, the phosphorus removal rate of La-ATP / SA particles can be obtained. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a cross-sectional view of an embodiment of this application; Figure 3 This is a cross-sectional view of the magnetized secondary sedimentation tank and the magnetic particle recovery mechanism; Figure 4 This is an exploded view of the magnetized secondary sedimentation tank and the magnetic particle recovery mechanism; Figure 5 yes Figure 3 Enlarged view of part A; Figure 6 yes Figure 3 Enlarged view of part B.

[0027] Explanation of reference numerals in the attached drawings: 1. Primary sedimentation tank; 11. Inlet pipe; 12. Outlet pipe; 13. Sewage pipe; 2. Filter column; 21. Water guide pipe; 3. Phosphorus removal tank; 31. Drive motor; 32. Stirring shaft; 33. Drainage pipe; 4. Magnetized secondary sedimentation tank; 41. Circulation pipe; 411. Water pump; 42. First return pipe; 5. Peristaltic pump; 51. First branch pipe; 52. Second branch pipe; 6. Magnetic particle recovery mechanism; 61. Recovery sleeve; 62. Power motor; 63. Screw; 64. First permanent magnet; 65. Scraper ring; 651 66. Second permanent magnet; 66. Positioning assembly; 661. Positioning rod; 662. Guide post; 663. Hook; 664. Electromagnet; 665. Return spring; 67. Collection cylinder; 671. Sponge; 672. Guide ring; 673. Displacement port; 674. Guide cylinder; 675. Spiral feed plate; 676. Third permanent magnet; 68. Guide assembly; 681. Limiting strip; 682. Guide groove; 683. Guide block; 684. Guide slope; 685. Return spring; 7. Fixed bed adsorption column; 71. Second return pipe. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Example

[0031] The experimental apparatus for determining the phosphorus removal performance of adsorbents under continuous flow conditions provided in this application embodiment is based on... Figure 1 and Figure 2 The system includes a primary sedimentation tank 1, a filter column 2, a phosphorus removal tank 3, and a magnetic secondary sedimentation tank 4. The primary sedimentation tank 1 is connected to the intensive fishpond. It is connected to the filter column 2 via an outlet pipe 12 and a peristaltic pump 5. The filter column 2 is connected to the phosphorus removal tank 3 via a water guide pipe 21. The phosphorus removal tank 3 is then connected to the magnetic secondary sedimentation tank 4 via a drain pipe 33. This multi-stage treatment of the effluent from the intensive fishpond effectively removes phosphorus and recycles the adsorbent, allowing for accurate measurement of the adsorbent's phosphorus removal performance under continuous flow conditions. This is because the entire device forms a continuous water treatment system, with different structures working together to progressively treat and test the water.

[0032] Specifically, the primary sedimentation tank 1 is connected to an inlet pipe 11 and an outlet pipe 12, and a drain pipe 13 is installed at the bottom of the primary sedimentation tank 1. The inlet pipe 11 is used to guide water from the intensive fishpond into the primary sedimentation tank 1. Its construction features include the use of corrosion-resistant PVC material to ensure long-term durability. The connection between the inlet pipe 11 and the intensive fishpond can be a flange connection, which provides good sealing performance and facilitates installation and disassembly. The outlet pipe 12 discharges the water treated in the primary sedimentation tank 1 and connects to the peristaltic pump 5. The connection can be sealed with a sealing ring to prevent leakage. The drain pipe 13 is located at the bottom of the primary sedimentation tank 1 and is used to discharge settled impurities. The drain pipe 13 can be equipped with a valve to facilitate control of the timing of discharge. When water from the intensive fishpond enters the primary sedimentation tank 1 through the inlet pipe 11, particles larger than 100μm in the water will naturally settle, achieving preliminary filtration.

[0033] The outlet pipe 12 and the peristaltic pump 5 are connected to a first branch pipe 51. A filter column 2 is mounted on the first branch pipe 51, and attapulgite particles are placed inside the filter column 2. Attapulgite particles have a unique crystal structure and a large specific surface area, effectively filtering suspended solids in the fishpond effluent. The attapulgite particles can be selected from particles within a specific size range to ensure filtration efficiency. The filter column 2 can be made of stainless steel, which has good corrosion resistance and strength. Filter screens can be installed at both ends of the filter column 2 to prevent the attapulgite particles from being lost. A water guide pipe 21, which can also be made of PVC, connects the filter column 2 to the phosphorus removal tank 3, guiding the filtered water into the phosphorus removal tank 3.

[0034] The phosphorus removal tank 3 contains a magnetic powdered adsorbent, which can be a powdered LaFeO-U composite material. A drive motor 31 is fixedly connected to the top of the phosphorus removal tank 3, and the output shaft of the drive motor 31 extends into the phosphorus removal tank 3 and is fixedly connected to a stirring shaft 32. The drive motor 31 can be a common AC motor with stable speed and power output. The stirring shaft 32 can be spiral-shaped, which allows for better stirring of the water during rotation, ensuring sufficient contact between the magnetic powdered adsorbent and the water. The surface of the magnetic powdered adsorbent is typically positively charged, while phosphate ions in the water are negatively charged; they are quickly adsorbed onto the surface of the material through electrostatic attraction. A drain pipe 33 is connected to the phosphorus removal tank 3 to discharge the treated water into the magnetic secondary sedimentation tank 4.

[0035] Reference Figure 3 and Figure 5 A magnetic particle recovery mechanism 6 is provided in the magnetized secondary sedimentation tank 4. The magnetic particle recovery mechanism 6 includes a recovery sleeve 61 fixedly connected inside the magnetized secondary sedimentation tank 4. A power motor 62 is fixedly connected to the top of the magnetized secondary sedimentation tank 4. A screw 63 is fixedly connected to the output shaft of the power motor 62. The screw 63 extends into the recovery sleeve 61, and the screw 63 and the recovery sleeve 61 are rotatably connected. A first permanent magnet 64 is threaded onto the screw 63. The recovery sleeve 61 can be made of plastic, possessing certain strength and corrosion resistance. The first permanent magnet 64 can be cylindrical, with its diameter being the same as the inner diameter of the recovery sleeve 61, thus ensuring that the first permanent magnet 64 slides smoothly inside the recovery sleeve 61. When the power motor 62 rotates in the forward direction, it drives the screw 63 to rotate, and the first permanent magnet 64 slides vertically along the circumference of the screw 63, adsorbing the magnetic powder in the water onto the outer wall of the recovery sleeve 61.

[0036] Referring to Figures 1 and 2, a scraper ring 65 is fitted onto the top of the recovery sleeve 61. A second permanent magnet 651 is installed on the side of the scraper ring 65 near the recovery sleeve 61. A positioning assembly 66 is installed on the magnetized secondary sedimentation tank 4 to fix the scraper ring 65. The positioning assembly 66 includes a positioning rod 661 fixedly connected to the magnetized secondary sedimentation tank 4. Two guide posts 662 are fixedly connected inside the positioning rod 661. The guide posts 662 are horizontally arranged, and hooks 663 are slidably connected to the guide posts 662. The hooks 663 are used to abut and support the bottom of the scraper ring 65. The hooks 663 are made of ferromagnetic material. An electromagnet 664 is fixedly connected inside the positioning rod 661. A return spring 665 is fixedly connected to the bottom of the hooks 663. The end of the return spring 665 away from the hooks 663 is fixedly connected to the positioning rod 661.

[0037] The scraping ring 65 can be made of rubber, possessing a certain degree of flexibility, allowing it to better conform to the outer wall of the recycling sleeve 61 for scraping. The second permanent magnet 651 can be square in shape for easy installation on the scraping ring 65. When it is necessary to recycle the magnetic particles on the recycling sleeve 61, the electromagnet 664 is energized, attracting the hook 663, causing the hook 663 to move towards the electromagnet 664. The hook 663 disengages from the scraping ring 65, at which point the second permanent magnet 651 and the first permanent magnet 64 move synchronously under the action of magnetic force, driving the scraping ring 65 to slide vertically, scraping off the magnetic particles attached to the recycling sleeve 61. By setting the scraping ring 65 and the positioning component 66, the magnetic particles adsorbed on the recycling sleeve 61 can be scraped off more effectively, realizing the recycling and reuse of magnetic particles. When the first permanent magnet 64 has adsorbed a certain amount of magnetic particles, the scraping ring 65 scrapes them off, preventing the magnetic particles from accumulating on the recycling sleeve 61 and affecting the adsorption effect. Meanwhile, the positioning component 66 can control the timing of the movement of the scraper ring 65, making the entire recycling process more controllable and improving the stability and reliability of the device. Compared with existing technologies, it can recycle magnetic particles more efficiently, reducing resource waste and secondary pollution to water bodies.

[0038] Reference Figure 3 and Figure 6The bottom of the recycling sleeve 61 is provided with a material collection cylinder 67 return spring 685, and the bottom of the material collection cylinder 67 return spring 685 is provided with a sponge 671 return spring 685. The top of the material collection cylinder 67 return spring 685 is integrally formed with a guide ring 672 return spring 685. The inner diameter of the guide ring 672 return spring 685 decreases from top to bottom. The top of the guide ring 672 return spring 685 abuts against the inner wall of the magnetized secondary sedimentation tank 4. The top of the guide ring 672 return spring 685 has multiple clearances along its circumference. The return spring 685 of the collection cylinder 67 is rotatably connected to the return spring 685 of the collection cylinder 67. The return spring 685 of the guide cylinder 674 is fixedly connected to the return spring 685 of the guide cylinder 674. The return spring 685 of the spiral feed plate 675 is fixedly connected to the return spring 685 of the guide cylinder 674. The return spring 685 of the third permanent magnet 676 is fixedly connected to the inner wall of the return spring 685 of the guide cylinder 674. The bottom of the recovery sleeve 61 is provided with a guide assembly 68 that drives the first permanent magnet 64 to rotate. The circulation pipe 41 is fixedly connected to the bottom of the return spring 685 of the collection cylinder 67.

[0039] The return spring 685 of the collecting cylinder 67 can be made of plastic, possessing a certain strength and corrosion resistance. The function of the sponge 671 return spring 685 is to support the bottom of the collecting cylinder 67 return spring 685. Simultaneously, when the scraper ring 65 slides downwards to scrape material and simultaneously squeezes the water flow, the water flows out from the sponge 671 return spring 685, blocking magnetic particles in the water flow. The special shape design of the guide ring 672 return spring 685 better guides magnetic particles into the collecting cylinder 67 return spring 685. The return springs 674 and 685 of the guide cylinder and the spiral feed plate 675 can be integrally molded, made of stainless steel, possessing good wear resistance.

[0040] By incorporating structures such as the return spring 685 of the collecting cylinder 67, the return spring 685 of the guide cylinder 674, and the return spring 685 of the spiral feed plate 675, magnetic particles can be collected and recycled more efficiently. The inclusion of the return spring 685 of the sponge 671 further improves the recovery rate of magnetic particles. The cooperation between the return spring 685 of the guide ring 672 and the return spring 685 of the spiral feed plate 675 ensures that the magnetic particles can be smoothly guided into the circulation pipe 41. The entire process is automated and highly efficient. Compared with existing technologies, it can better achieve the collection and recycling of magnetic particles, improve resource utilization, and reduce operating costs.

[0041] A circulation pipe 41 is installed at the bottom of the magnetic secondary sedimentation tank 4. The end of the circulation pipe 41 away from the magnetic secondary sedimentation tank 4 extends into the phosphorus removal tank 3. A water pump 411 is installed on the circulation pipe 41. The circulation pipe 41 can be made of rubber, which has a certain degree of flexibility and is easy to install and arrange. The water pump 411 can be a small centrifugal pump, which can provide sufficient power to guide the separated magnetic powder adsorbent through the circulation pipe 41 into the phosphorus removal tank 3. In this way, the magnetic powder adsorbent is separated from the water, reducing secondary pollution to the water body, and the separated magnetic powder adsorbent is recycled, reducing resource waste.

[0042] The guide assembly 68 includes multiple limiting strips 681 fixedly connected to the inner side wall of the recovery sleeve 61. A guide groove 682 is formed between adjacent limiting strips 681. A guide block 683 is fixedly connected to the side wall of the first permanent magnet 64. The guide block 683 is slidably connected in the guide groove 682. A gap is left between the limiting strips 681 and the bottom of the recovery sleeve 61. The gap is greater than the height of the first permanent magnet 64. A guide slope 684 is provided near the bottom of the limiting strips 681. A return spring 685 is fixedly connected to the bottom of the recovery sleeve 61. The part of the screw 63 near the gap is not threaded. The power motor 62 rotates in the forward direction, driving the screw 63 to rotate. The guide block 683 and the guide groove 682 cooperate to make the first electromagnet 664 slide vertically downward. When the guide block 683 of the first electromagnet 664 disengages from the guide groove 682, the first electromagnet 664 slides to the bottom of the slide rod. The first electromagnet 664 rotates with the screw 63. The rotation of the first electromagnet 664 can drive the return spring 685 of the third permanent magnet 676 to rotate through magnetic force. The rotation of the return spring 685 of the third permanent magnet 676 drives the return spring 685 of the guide cylinder 674 to rotate. The first electromagnet 664 can be guided to the circulation pipe 41 by the spiral feed plate 675 and the return spring 685. The tension of the return spring 685 facilitates the upward reset of the first permanent magnet 64. When the power motor 62 rotates in the reverse direction, the drive screw 63 drives the first permanent magnet 64 to rotate in the reverse direction. The guide block 683 is guided into the guide groove 682 by the guide inclined surface 684, so that the first permanent magnet 64 slides upward along the guide groove 682. This allows the first electromagnet 664 to have the functions of linear motion to attract electromagnetic particles, rotational motion to feed, and automatic reset.

[0043] The top of the magnetized secondary sedimentation tank 4 is equipped with a first return pipe 42, and a sampling point is set on the first return pipe 42. The first return pipe 42 can be made of transparent PVC pipe for easy observation of water flow. A valve can be installed at the sampling point for convenient sampling operation.

[0044] The implementation principle of this embodiment is as follows: The experimental device uses a primary sedimentation tank 1 to perform preliminary sedimentation on the effluent from an intensive fish farming pond, removing large particulate impurities; a filter column 2 further filters suspended solids in the water; a phosphorus removal tank 3 uses a magnetic powdered adsorbent to adsorb phosphate ions in the water; and a magnetic secondary sedimentation tank 4 uses a magnetic particle recovery mechanism 6 to separate the magnetic powdered adsorbent from the water and recycle it. The entire device forms a continuous water flow treatment system, simulating continuous flow conditions. By setting sampling points at different locations, the phosphorus removal performance of the adsorbent under continuous flow conditions can be accurately measured, providing data support and technical basis for the engineering application of adsorption and phosphorus removal materials. Compared with existing technologies, it can better adapt to actual continuous flow treatment scenarios and solves the problem of insufficient research on continuous flow conditions in existing studies. Example

[0045] The difference between this embodiment and the above embodiment is that: a second branch pipe 52 is connected to the peristaltic pump 5, and a fixed bed adsorption column is fixedly connected to the second branch pipe 52. The fixed bed adsorption column is filled with granular phosphorus removal adsorbent, which is 200ml La-ATP / SA granules. A second reflux pipe is provided on the fixed bed adsorption column, and a sampling point is provided on the second reflux pipe.

[0046] Fixed-bed adsorption columns can be made of glass, which offers excellent transparency and facilitates observation of internal water flow and adsorption. Sealing caps can be installed at both ends of the fixed-bed adsorption column to prevent leakage. La-ATP / SA granules combine filtration and high-efficiency phosphorus removal functions, and are directly used as filter media in a dedicated adsorption column. A 2cm thick layer of glass beads is placed at both ends of the bed to ensure uniform water distribution and prevent filter media loss.

[0047] The implementation principle of this embodiment is as follows: Based on the above embodiment, a fixed-bed adsorption column is added, which can be used to examine the dynamic adsorption performance of granular phosphorus removal adsorbents under continuous flow conditions. Water after sedimentation in the primary sedimentation tank 1 is guided into the fixed-bed adsorption column. La-ATP / SA particles adsorb and filter phosphorus in the water. The total phosphorus and dissolved phosphorus concentrations in the water sample are then detected through sampling points on the second return pipe. The data are compared with the influent data of the adsorption column to obtain the phosphorus removal rate of the La-ATP / SA particles. This allows for a more comprehensive determination of the phosphorus removal performance of different types of adsorbents under continuous flow conditions, meeting the diverse needs of phosphorus removal technology in different application scenarios, and further promoting the development and application of adsorption phosphorus removal technology. Example

[0048] The experimental method for determining the phosphorus removal performance of an adsorbent under continuous flow conditions provided in this application includes the following steps: S1. Pretreatment: The fishpond effluent is diverted to the primary sedimentation tank 1. Utilizing the principle of gravity sedimentation, particles with a diameter greater than 100μm in the water can settle naturally, achieving preliminary filtration of the fishpond effluent.

[0049] Sampling point 1 is set on the inlet pipe 11 of the primary sedimentation tank 1. Sampling point 1 is set as the sampling point at the inlet end, so that the initial phosphorus concentration of the inlet water can be obtained as a reference for the experiment.

[0050] Sampling point two is set on the effluent pipe 12 of primary sedimentation tank 1. Sampling point two obtains the phosphorus concentration of the effluent after treatment by primary sedimentation tank 1, mainly used to determine the phosphorus removal effect of primary sedimentation tank 1 itself. The main function of primary sedimentation tank 1 is to remove suspended solids, but it also removes a small amount of phosphorus through the adsorption of suspended solids. This data can help eliminate the interference of the phosphorus removal effect of primary sedimentation tank 1 on the performance measurement of the adsorbent. During operation, a suitable pipe is used to guide the fish pond effluent to primary sedimentation tank 1. The material of the pipe can be selected according to the actual situation, such as PVC, stainless steel, etc. When sampling, a special sampling tool, such as a sampling bottle, can be used to ensure the accuracy of the sampling.

[0051] S2. Phosphorus removal by powdered phosphorus adsorbent: The fish pond effluent after sedimentation in the primary sedimentation tank 1 is passed through a powdered phosphorus adsorbent (magnetic LaFeO-U composite material).

[0052] a1. Filter Column 2: Filtering Suspended Particles. The filter bed of filter column 2 uses attapulgite particles with a diameter of 1-2mm as the core filter media, with a 2cm thick layer of glass beads at each end. This not only effectively traps fine suspended particles but also simultaneously removes some phosphorus and nitrogen pollutants. A sampling point three is set after filter column 2 to obtain data such as the concentration of phosphorus and nitrogen in the filtered water and the content of suspended solids. Comparing this data with the influent indicators of filter column 2 allows for accurate calculation of the removal rate of various pollutants by filter column 2, determining whether the attapulgite filter media still maintains good adsorption and purification capacity, and also indicating whether the retention effect of the glass bead layer meets the standards. When filling the filter media and glass bead layer, ensure uniform filling to prevent gaps from affecting the filtration effect.

[0053] a2. Phosphorus Removal by Adsorption in Phosphorus Removal Tank 3: Magnetic LaFeO-U composite material is added to phosphorus removal tank 3. The magnetic LaFeO-U composite material relies on its own adsorption or chemical precipitation with phosphorus. The drive motor 31 drives the stirring shaft 32 to rotate. The stirring shaft 32 breaks up the static stratification of the wastewater, allowing the magnetic powder to disperse evenly in the wastewater, preventing the magnetic powder from settling at the bottom and failing to fully contact the phosphorus in the wastewater, thus significantly improving the phosphorus removal efficiency of the magnetic powder. When adding the magnetic LaFeO-U composite material, it should be added in a certain proportion, and the speed of the drive motor 31 should be controlled to ensure the stirring effect.

[0054] a3. Magnetic Powder Recovery and Reuse: Residual magnetic particles in the water fall to the bottom of the magnetic secondary sedimentation tank 4 under gravity. The remaining magnetic particles are attracted by the first permanent magnet 64, causing them to adhere to the outer wall of the recovery sleeve 61. The scraper ring 65 scrapes off the larger magnetic particles from the outer wall of the recovery sleeve 61. The magnetic particles collect on the return spring 5 of the spiral feed plate 67. The first permanent magnet 64 drives the spiral feed plate 67 and return spring 5 to rotate, pushing the magnetic particles onto the circulation pipe 41. The circulation pipe 41 guides the magnetic particles into the phosphorus removal tank 3, achieving material recycling. Sampling point four is set on the first return pipe 42 of the magnetic secondary sedimentation tank 4. Sampling point four can test the final effluent quality after phosphorus removal treatment, detecting indicators such as phosphorus concentration, nitrogen concentration, and suspended solids content. This directly confirms whether the treated water quality meets the corresponding effluent requirements and is the final verification of the entire phosphorus removal process's effectiveness. During the recycling and reuse process, it is essential to ensure the normal operation of all components, such as the power motor 62 and the water pump 411.

[0055] S3. Phosphorus removal by granular adsorbent: The fishpond effluent after sedimentation in the primary sedimentation tank 1 is adsorbed by La-ATP / SA (spherical granular adsorbent) adsorption material.

[0056] a1. Fixed-bed adsorption column filtration for phosphorus removal: La-ATP / SA granules combine filtration and high-efficiency phosphorus removal functions. They are directly used as filter media and packed into a dedicated adsorption column. A 2cm thick layer of glass beads is placed at both ends of the bed to ensure uniform water distribution and prevent filter media loss. Water from the effluent pipe 12 of the primary sedimentation tank 1 is guided into the fixed-bed adsorption column, where the La-ATP / SA granules adsorb phosphorus and filter suspended solids. When packing the La-ATP / SA granules and glass beads, attention should be paid to the packing density and uniformity.

[0057] a2. Sampling point five is set on the second return water pipe: Sampling point five can directly reflect the adsorption and treatment capacity of La-ATP / SA particles for phosphorus. By detecting the total phosphorus and dissolved phosphorus concentrations in the water sample and comparing them with the inlet water data sampling point two of the adsorption column, the phosphorus removal rate of La-ATP / SA particles can be obtained.

[0058] The implementation principle of this embodiment is as follows: This experimental method pre-treats the fishpond effluent, then uses powdered and granular phosphorus removal adsorbents for phosphorus removal, and recovers and recycles the magnetic powder adsorbent. Sampling points are set at different locations to comprehensively and accurately determine the phosphorus removal performance of the adsorbent under continuous flow conditions. The entire method simulates a real continuous flow treatment scenario. Through strict control and data detection of each step, it provides a scientific basis for the engineering application of adsorption phosphorus removal materials. Compared with existing technologies, it can better adapt to practical application needs and solves the problem of insufficient research on continuous flow conditions in existing studies.

[0059] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An experimental apparatus for determining the phosphorus removal performance of an adsorbent under continuous flow conditions, characterized in that: The system includes a primary sedimentation tank (1), an inlet pipe (11) and an outlet pipe (12) connected to the primary sedimentation tank (1), a sewage pipe (13) at the bottom of the primary sedimentation tank (1), an inlet pipe (11) connected to the intensive fish pond, a peristaltic pump (5) connected to the outlet pipe (12), a first branch pipe (51) connected to the connection between the outlet pipe (12) and the peristaltic pump (5), a filter column (2) connected to the first branch pipe (51), attapulgite particles inside the filter column (2) for filtering suspended solids in the fish pond tailwater, a guide pipe (21) connected to the filter column (2), a phosphorus removal tank (3) connected to the guide pipe (21), and magnetic powder inside the phosphorus removal tank (3). The top of the phosphorus removal tank (3) is fixedly connected to a drive motor (31), the output shaft of the drive motor (31) extends into the phosphorus removal tank (3) and is fixedly connected to a stirring shaft (32), a drain pipe (33) is connected to the phosphorus removal tank (3), a magnetic secondary sedimentation tank (4) is connected to the drain pipe (33), a magnetic particle recovery mechanism (6) is provided in the magnetic secondary sedimentation tank (4), a first return pipe (42) is provided at the top of the magnetic secondary sedimentation tank (4), a circulation pipe (41) is provided at the bottom of the magnetic secondary sedimentation tank (4), one end of the circulation pipe (41) away from the magnetic secondary sedimentation tank (4) extends into the phosphorus removal tank (3), and a water pump (411) is provided on the circulation pipe (41).

2. The experimental apparatus for determining the phosphorus removal performance of an adsorbent under continuous flow conditions according to claim 1, characterized in that: The peristaltic pump (5) is connected to a second branch pipe (52), and a fixed bed adsorption column (7) is fixedly connected to the second branch pipe (52). The fixed bed adsorption column (7) contains granular phosphorus removal adsorbent, and a second reflux pipe (71) is provided on the fixed bed adsorption column (7).

3. The experimental apparatus for determining the phosphorus removal performance of an adsorbent under continuous flow conditions according to claim 2, characterized in that: The granular phosphorus removal adsorbent is 200ml La-ATP / SA granules, and the magnetic powder adsorbent is powdered LaFeO-U composite material.

4. The experimental apparatus for determining the phosphorus removal performance of an adsorbent under continuous flow conditions according to claim 1, characterized in that: The magnetic particle recovery mechanism (6) includes a recovery sleeve (61) fixedly connected to the magnetized secondary sedimentation tank (4). A power motor (62) is fixedly connected to the top of the magnetized secondary sedimentation tank (4). A screw (63) is fixedly connected to the output shaft of the power motor (62). The screw (63) extends into the recovery sleeve (61). The screw (63) and the recovery sleeve (61) are rotatably connected. A first permanent magnet (64) is threaded onto the screw (63). The diameter of the first permanent magnet (64) is the same as the inner diameter of the recovery sleeve (61).

5. The experimental apparatus for determining the phosphorus removal performance of an adsorbent under continuous flow conditions according to claim 4, characterized in that: The top of the recycling sleeve (61) is fitted with a scraper ring (65), and a second permanent magnet (651) is provided on the side of the scraper ring (65) near the recycling sleeve (61). A positioning component (66) for fixing the scraper ring (65) is provided on the magnetized secondary sedimentation tank (4).

6. The experimental apparatus for determining the phosphorus removal performance of an adsorbent under continuous flow conditions according to claim 5, characterized in that: The positioning component (66) includes a positioning rod (661) fixedly connected to the magnetized secondary sedimentation tank (4). Two guide columns (662) are fixedly connected inside the positioning rod (661). The guide columns (662) are horizontally arranged. A hook (663) is slidably connected to the guide column (662). The hook (663) is used to abut against the bottom of the scraper ring (65). The hook (663) is made of ferromagnetic material. An electromagnet (664) is fixedly connected inside the positioning rod (661). A return spring (665) is fixedly connected to the bottom of the hook (663). The end of the return spring (665) away from the hook (663) is fixedly connected to the positioning rod (661).

7. The experimental apparatus for determining the phosphorus removal performance of an adsorbent under continuous flow conditions according to claim 4, characterized in that: The bottom of the recycling sleeve (61) is provided with a collection cylinder (67), the bottom of the collection cylinder (67) is provided with a sponge (671), the top of the collection cylinder (67) is integrally formed with a guide ring (672), the inner diameter of the guide ring (672) decreases from top to bottom, the top of the guide ring (672) abuts against the inner wall of the magnetized secondary sedimentation tank (4), the top of the guide ring (672) is provided with multiple clearance openings (673) along its circumference, the collection cylinder (674) is rotatably connected to the inside of the collection cylinder (67), the guide cylinder (674) is fixedly connected with a spiral feeding plate (675), the inner wall of the guide cylinder (674) is fixedly connected with a third permanent magnet (676), the bottom of the recycling sleeve (61) is provided with a drive first permanent magnet (64) rotation guide assembly (68), and the circulation pipe (41) is fixedly connected to the bottom of the collection cylinder (67).

8. The experimental apparatus for determining the phosphorus removal performance of an adsorbent under continuous flow conditions according to claim 7, characterized in that: The guide assembly (68) includes multiple limiting strips (681) fixedly connected to the inner sidewall of the recovery sleeve (61), and a guide groove (682) is formed between adjacent limiting strips (681). A guide block (683) is fixedly connected to the sidewall of the first permanent magnet (64), and the guide block (683) is slidably connected in the guide groove (682). A gap is left between the limiting strips (681) and the bottom of the recovery sleeve (61), and the gap is greater than the height of the first permanent magnet (64). A guide slope (684) is provided near the bottom of the limiting strips (681). A return spring (685) is fixedly connected to the bottom of the recovery sleeve (61). The part of the screw (63) near the gap is not threaded.

9. A test method for an experimental apparatus for determining the phosphorus removal performance of an adsorbent under continuous flow conditions, comprising the following steps: S1. Pretreatment: The fish pond tailwater is diverted to the primary sedimentation tank (1). Using the principle of gravity sedimentation, particles with a diameter greater than 100μm in the water can settle naturally, thus achieving the initial filtration of the fish pond tailwater. Sampling point 1 is set on the inlet pipe (11) of the primary sedimentation tank (1). Sampling point 1 is set as the sampling point at the inlet end, so that the initial phosphorus concentration of the inlet water can be obtained as the reference for the experiment. Sampling point 2 is set on the effluent pipe (12) of the primary sedimentation tank (1). Sampling point 2 obtains the phosphorus concentration of the effluent after treatment by the primary sedimentation tank (1). It is mainly used to judge the phosphorus removal effect of the primary sedimentation tank (1) itself. The main function of the primary sedimentation tank (1) is to remove suspended solids, but it will also remove a small amount of phosphorus through the adsorption of suspended solids. This data can help you eliminate the interference of the phosphorus removal effect of the primary sedimentation tank (1) on the performance measurement of the adsorbent. S2, Phosphorus removal by powdered phosphorus adsorbent: The fishpond effluent after sedimentation in the primary sedimentation tank (1) is passed through a powdered phosphorus adsorbent (magnetic LaFeO-U composite material): a1. Filter column (2) filters suspended particles: The filter column (2) bed is filled with attapulgite particles with a particle size of 1-2mm as the core filter material, and the two ends are filled with a 2cm thick glass bead layer. It can not only effectively intercept fine suspended particles, but also remove some phosphorus and nitrogen pollutants at the same time. Sampling point three is set after the filter column (2) to obtain data such as the concentration of phosphorus and nitrogen and the content of suspended solids in the filtered water. By comparing these data with the influent index of the filter column (2), the removal rate of various pollutants by the filter column (2) can be accurately calculated, and it can be determined whether the attapulgite filter media still maintains good adsorption and purification capabilities. At the same time, it can also be known whether the interception effect of the glass bead layer meets the standard. a2. Phosphorus removal tank (3) adsorption and phosphorus removal: Magnetic LaFeO-U composite material is added to the phosphorus removal tank (3). The magnetic LaFeO-U composite material relies on its own adsorption or chemical precipitation with phosphorus to drive the motor (31) to drive the stirring shaft (32) to rotate. The stirring shaft (32) can break the static stratification state of the wastewater, allowing the magnetic powder to be evenly dispersed in the wastewater, avoiding the magnetic powder from settling at the bottom of the tank and failing to fully contact the phosphorus in the wastewater, thereby greatly improving the phosphorus removal efficiency of the magnetic powder. a3. Magnetic Powder Recycling and Reuse: The magnetic particles remaining in the water fall to the bottom of the magnetic secondary sedimentation tank (4) under the action of gravity. The remaining magnetic particles are attracted by the first permanent magnet (64) and attach to the outer wall of the recycling sleeve (61). The scraper ring (65) scrapes off the large magnetic particles from the outer wall of the recycling sleeve (61). The magnetic particles are collected on the spiral feed plate (675). The first permanent magnet (64) drives the spiral feed plate (675) to rotate and push the magnetic particles to the circulation pipe (41). The circulation pipe (41) guides the magnetic particles to the phosphorus removal tank (3) to realize the recycling of materials. The fourth sampling point of the magnetic secondary sedimentation tank (4) can test the final effluent quality after phosphorus removal treatment. The phosphorus concentration, nitrogen concentration, suspended solids content and other indicators can be detected here. It can directly confirm whether the treated water quality meets the corresponding effluent requirements. It is the final verification of the treatment effect of the entire phosphorus removal process. S3, Phosphorus removal by granular adsorbent: The fishpond effluent after sedimentation in the primary sedimentation tank (1) is adsorbed by La-ATP / SA (spherical granular adsorbent) material: a1. Fixed bed adsorption column (7) for phosphorus removal: La-ATP / SA particles have both filtration and high-efficiency phosphorus removal functions. They are directly used as filter media and filled into a special adsorption column. A 2cm thick glass bead layer is filled at both ends of the bed. The glass bead layer ensures uniform water distribution and prevents filter media loss. The water on the outlet pipe (12) of the primary sedimentation tank (1) is guided to the fixed bed adsorption column (7). The La-ATP / SA particles play the role of adsorbing phosphorus and filtering suspended solids. a2. Sampling point five is set on the second return water pipe: Sampling point five can directly reflect the adsorption and treatment capacity of La-ATP / SA particles for phosphorus. By detecting the total phosphorus and dissolved phosphorus concentrations in the water sample and comparing them with the inlet water data sampling point two of the adsorption column, the phosphorus removal rate of La-ATP / SA particles can be obtained.

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