Multi-effect phosphorus removal and algae control device

Abstract

The invention provides a multi-effect phosphorus removal and algae control device which is combined with an ecological floating island, a phosphorus removal unit and an algae control unit to form a comprehensive water treatment system. Phosphorus absorbing plants are planted on the ecological floating island, and phosphorus in the water body is removed through the biological absorption effect; the phosphorus removal unit adopts a phosphorus removal sponge pad loaded with nano lanthanum hydroxide, so that the phosphorus removal effect is further enhanced; the algae control unit guides natural light into an underwater photocatalytic cavity through a light guide pipe, the activity of photocatalytic materials (such as carbon nitride) is excited, and algae growth is effectively inhibited. According to the multi-effect phosphorus removal and algae control device, through the synergistic effect of physical, chemical and biological modes, the phosphorus removal and algae control efficiency is greatly improved, and the phosphorus content and the number of algae in a water body are effectively controlled. According to the scheme, the limitation of a single means of a traditional method is solved, the overall effect of water treatment is improved, powerful support is provided for improving water quality and protecting the water ecological environment, and the method has wide application prospects.

Description

Technical Field

[0001] This application relates to the technical field of water pollution treatment, and particularly to a multi-effect phosphorus removal and algae control device. Background Art

[0002] The eutrophication of river and lake water bodies and the outbreak of cyanobacteria are major challenges faced in the current water environment governance field. Phosphorus pollution, as the main cause of this problem, not only disrupts the balance of the water ecosystem but also seriously threatens the safety of drinking water and the beauty of river and lake landscapes. The deterioration of water quality caused by eutrophication not only affects the survival and reproduction of aquatic organisms but also may pose potential risks to human health through the food chain. At the same time, the algal bloom phenomenon brought about by the outbreak of cyanobacteria not only affects the ornamental value of rivers and lakes but also may release toxic substances, further exacerbating the water quality problem. Therefore, effective phosphorus removal and algae control are of crucial significance for maintaining the health of the water environment, ensuring the safety of drinking water, protecting the biodiversity of aquatic organisms, and enhancing the landscape of rivers and lakes.

[0003] However, the existing phosphorus removal and algae control devices and technologies have obvious limitations. Traditional methods often focus on single phosphorus removal or algae control means and are difficult to meet the requirements of efficient phosphorus removal and effective algae control simultaneously. Summary of the Invention

[0004] The purpose of this application is to provide a multi-effect phosphorus removal and algae control device, which can improve the above problems.

[0005] The embodiments of this application are implemented as follows:

[0006] This application provides a multi-effect phosphorus removal and algae control device, which includes an ecological floating island floating on the water surface, a phosphorus removal unit and an algae control unit submerged underwater;

[0007] The ecological floating island includes a polyethylene floating board and phosphorus-absorbing plants inserted on the polyethylene floating board;

[0008] The phosphorus removal unit includes a phosphorus removal sponge pad loaded with nano lanthanum hydroxide, and the phosphorus removal sponge pad is fixed on the surface of the ecological floating island facing underwater;

[0009] The algae control unit includes a light guide tube, a photocatalytic cavity, and a photocatalytic material arranged in the photocatalytic cavity; a first through hole is provided on the polyethylene floating board, and a second through hole is provided on the phosphorus removal sponge pad, and the first through hole and the second through hole coincide with each other; the head end of the light guide tube passes through the second through hole and the first through hole and exposes above the water surface, and the tail end of the light guide tube is fixed on the photocatalytic cavity; the light guide tube is used to introduce natural light on the water surface into the photocatalytic cavity underwater.

[0010] It can be understood that the present application provides a multi-effect phosphorus removal and algae control device, which combines an ecological floating island, a phosphorus removal unit and an algae control unit to form a comprehensive water body treatment system. Phosphorus-absorbing plants are planted on the ecological floating island, and phosphorus in the water body is removed through biological absorption; the phosphorus removal unit uses a phosphorus removal sponge pad loaded with nano lanthanum hydroxide to further enhance the phosphorus removal effect; the algae control unit uses a light guide tube to introduce natural light into the underwater photocatalytic cavity to activate the photocatalytic material (such as carbon nitride), effectively inhibiting the growth of algae. The multi-effect phosphorus removal and algae control device greatly improves the efficiency of phosphorus removal and algae control through the synergistic effect of physical, chemical and biological methods, effectively controlling the phosphorus content and the number of algae in the water body. This solution not only solves the limitations of single means of traditional methods, but also improves the overall effect of water body treatment, provides strong support for improving water quality and protecting the water ecological environment, and has broad application prospects.

[0011] In an optional embodiment of the present application, the preparation method of the phosphorus removal sponge pad loaded with nano lanthanum hydroxide includes: preparing a lanthanide compound solution, heating and reacting under alkaline conditions until the lanthanide completely forms a La(OH)3 slurry; immersing the sponge pad in the La(OH)3 slurry for soaking; after washing the soaked sponge pad, drying the sponge pad to obtain the phosphorus removal sponge pad loaded with nano lanthanum hydroxide.

[0012] It can be understood that although there is current research on using lanthanum hydroxide materials to absorb phosphorus in water bodies, due to their particulate powder form, they are prone to loss in water bodies and it is difficult to achieve efficient phosphorus removal. This embodiment effectively solves the problem of easy loss of lanthanum hydroxide powder in water bodies by preparing a phosphorus removal sponge pad loaded with nano lanthanum hydroxide. Sponge, as a loading material, has low cost, is easy to use, and is easy to promote. The preparation process is simple and convenient, does not require special equipment, and has good reproducibility. The loaded sponge pad not only improves the stability of lanthanum hydroxide, but also greatly improves the phosphorus removal efficiency, having obvious advantages compared with other materials. In addition, the phosphorus removal sponge pad has high biological safety and is environmentally friendly.

[0013] In an optional embodiment of the present application, the preparation method of the phosphorus removal sponge pad loaded with nano lanthanum hydroxide specifically includes the following steps:

[0014] S11, preparing a lanthanide compound solution by stirring and dissolving lanthanum nitrate, lanthanum chloride and lanthanum sulfate;

[0015] S12, adding an alkaline substance to the lanthanide compound solution to create an alkaline condition, and the alkaline substance includes sodium hydroxide and potassium hydroxide;

[0016] S13, heating the lanthanide compound solution under alkaline conditions until the lanthanide completely forms a La(OH)3 slurry;

[0017] S14. Immerse the sponge pad into the La(OH)3 slurry, stir it, and after complete mixing, place it in an ultrasonic machine for ultrasonic treatment.

[0018] S15. Fish out the sponge pad loaded with La(OH)3, slowly stir it in deionized water to wash away the excess La(OH)3.

[0019] S16. Dry the washed sponge pad to obtain a phosphorus-removing sponge pad loaded with nano lanthanum hydroxide.

[0020] In an alternative embodiment of the present application, the photocatalytic material is used to receive the natural light transmitted by the light guide tube, thereby catalyzing the generation of free radicals from ozone in the air, and using the strong oxidation of the free radicals to crack algal cells; at least one small hole is distributed on the photocatalytic cavity for diffusing the free radicals into the water body.

[0021] In an alternative embodiment of the present application, the photocatalytic material is graphitic carbon nitride (g-C3N4) prepared by a thermal polymerization method using melamine as a raw material.

[0022] It can be understood that although some studies in the prior art use the photocatalytic effect of TiO2 to control algae, cracking algal cells through the strong oxidation of free radicals to achieve effective algae control. However, the TiO2 material uses only ultraviolet light as a light source, which greatly affects the light absorption rate of the catalyst. To solve the above problems, this embodiment uses micron-scale graphitic carbon nitride (g-C3N4) synthesized from melamine as a photocatalytic material, catalyzing the generation of free radicals from ozone in the air through the transmission of natural light by the light guide tube, and using the strong oxidation of the free radicals to crack algal cells to achieve effective algae control. This photocatalytic material has the advantages of adjustable energy band structure, easy synthesis, low price, high chemical stability, etc., and has no risk of secondary pollution. This solution not only greatly reduces the preparation cost, improves the treatment stability, but also realizes the low-carbon, green and friendly operation of the algae removal unit, without using electric energy, providing an efficient and environmentally friendly new way for water body algae control.

[0023] In an alternative embodiment of the present application, the preparation method of the graphitic carbon nitride (g-C3N4) includes:

[0024] S21. Mix melamine and phosphorous acid and add them to deionized water for stirring. After the phosphorous acid is completely dissolved and the melamine is evenly dispersed in the solution, transfer the mixture to a stainless steel autoclave for heating reaction to obtain a carbon nitride precursor.

[0025] S22. Wash the precursor with pure water and then with ethanol to completely remove the impurities on the surface of the precursor, and then dry the washed precursor.

[0026] S23. Place the dried precursor under an inert gas atmosphere and perform high-temperature heat treatment to self-assemble it into the micron-scale graphitic carbon nitride.

[0027] In an alternative embodiment of the present application, the phosphorus-adsorbing plants include at least one of the following: Canna indica, Alternanthera reineckii, Acorus calamus. It can be understood that on the one hand, the ecological floating island uses the phosphorus-adsorbing effect of plant roots to remove phosphorus-containing pollutants in the water body, and on the other hand, it serves as a carrier for the phosphorus removal unit and the algae control unit.

[0028] In an alternative embodiment of the present application, the above multi-effect phosphorus removal and algae control device includes at least one of the following:

[0029] The head end of the light guide tube is a spherical surface convex away from the water surface. The convex spherical surface has the function of converging light beams, which is beneficial to collecting natural light within a larger angular range for the catalytic reaction.

[0030] The tail end of the light guide tube is a concave surface concave towards the head end. The concave surface has the function of diverging light beams, which can effectively diffuse the light beams transmitted in the light guide tube into the photocatalytic cavity for the catalytic reaction.

[0031] In an alternative embodiment of the present application, the head end of the light guide tube is an inclined plane; a stator ring is also fixed inside the first through hole, and a coil through hole is provided on the side wall of the stator ring for accommodating the driving coil; a rotor ring is fixed outside the head end of the light guide tube, and a magnet is embedded in the rotor ring. The magnet includes an S pole and an N pole arranged side by side. When a clockwise current is generated in the driving coil, the magnet drives the rotor ring to rotate in the first direction, and when a counterclockwise current is generated in the driving coil, the magnet drives the rotor ring to rotate in a second direction opposite to the first direction.

[0032] It can be understood that when the head end of the light guide tube is an inclined plane, the light beams collected by the light guide tube have a certain angular tendency. The driving coil can be controlled to generate a corresponding counterclockwise current or clockwise current according to the current illumination direction of the sunlight, so that the magnet drives the rotor ring to rotate, thereby driving the inclined plane of the light guide tube to rotate to a corresponding angle to collect the current sunlight within the largest range.

[0033] In an alternative embodiment of the present application, the multi-effect phosphorus removal and algae control device includes: a processor and a signal receiver; the signal receiver is used to receive an instruction for controlling the turning of the light guide tube, and the processor is electrically connected to the driving coil and is used to control the driving coil to generate a corresponding driving current according to the instruction.

[0034] In an alternative embodiment of the present application, the multi-effect phosphorus removal and algae control device includes: a processor and a light sensing device; the light sensing device is laid on the polyethylene floating board, and the processor is electrically connected to the drive coil, and is configured to analyze the current light direction according to the feedback signal of the light sensing device, and control the drive coil to generate a corresponding drive current corresponding to the current light direction.

[0035] Beneficial effects:

[0036] The present application proposes a multi-effect phosphorus removal and algae control device, which realizes the organic coordination of physical, chemical, and biological methods by combining an ecological floating island, a phosphorus removal unit, and an algae control unit. The device uses phosphorus-absorbing plants, nano-lanthanum hydroxide phosphorus removal sponge pads, and carbon nitride photocatalytic algae removal technology to simultaneously improve the phosphorus removal and algae control efficiency, increasing the phosphorus removal efficiency by 20% to 30% and the algae control efficiency by 30% to 50%. This multi-effect phosphorus removal and algae control device effectively solves the limitations of single means in traditional methods, stably maintains the TP concentration of river and lake water bodies at the surface class III water quality, provides a new and efficient and diversified way for water body treatment, and has significant environmental benefits and application prospects.

[0037] The present application effectively solves the problem of easy loss of lanthanum hydroxide powder in water by preparing a phosphorus removal sponge pad loaded with nano-lanthanum hydroxide. As a loading material, the sponge is low-cost, easy to use, and easy to promote. The preparation process is simple and convenient, does not require special equipment, and has good reproducibility. The loaded sponge pad not only improves the stability of lanthanum hydroxide but also greatly enhances the phosphorus removal efficiency, having obvious advantages compared with other materials. In addition, the phosphorus removal sponge pad has high biological safety and is environmentally friendly.

[0038] The present application uses micron-scale graphitic carbon nitride (g-C3N4) synthesized from melamine as a photocatalytic material, and transmits natural light through a light guide tube to catalyze ozone in the air to generate free radicals. The strong oxidation effect of the free radicals is used to crack algal cells to achieve effective algae control. This photocatalytic material has the advantages of adjustable energy band structure, easy synthesis, low price, high chemical stability, etc., and has no risk of secondary pollution. This solution not only greatly reduces the preparation cost, improves the treatment stability, but also realizes the low-carbon, green, and friendly operation of the algae control unit without using electric energy, providing a new and efficient and environmentally friendly way for water body algae control.

[0039] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specific embodiments are given below, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0040] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 is a schematic structural diagram of a multi-effect phosphorus removal and algae control device provided by the present application;

[0042] Figure 2 is Figure 1 a schematic cross-sectional view of the multi-effect phosphorus removal and algae control device shown;

[0043] Figure 3 is a schematic cross-sectional view of a light guide tube provided by the present application;

[0044] Figure 4 is a schematic cross-sectional view of another light guide tube provided by the present application;

[0045] Figure 5 is a schematic cross-sectional view of a light guide tube with an inclined surface provided by the present application;

[0046] Figure 6 is a schematic disassembled structure diagram of a polyethylene floating board provided by the present application;

[0047] Figure 7 is a schematic diagram of the working principle of the rotor ring rotation provided by the present application. Detailed implementation manners

[0048] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present application.

[0049] The present application provides a multi-effect phosphorus removal and algae control device, which includes an ecological floating island floating on the water surface and a phosphorus removal unit and an algae control unit submerged underwater.

[0050] As Figure 1 shown, the ecological floating island includes a polyethylene floating board 1 and phosphorus-absorbing plants inserted on the polyethylene floating board 1. In an optional embodiment of the present application, the phosphorus-absorbing plants include at least one of the following: canna, alternanthera reineckii, acorus calamus. It can be understood that on the one hand, the ecological floating island uses the phosphorus-absorbing effect of plant roots to remove phosphorus-containing pollutants in the water body, and on the other hand, it serves as a carrier for the phosphorus removal unit and the algae control unit.

[0051] Continue to refer to Figure 1 The phosphorus removal unit includes a phosphorus removal sponge pad 2 loaded with nano lanthanum hydroxide. The phosphorus removal sponge pad 2 is fixed on the underwater side surface of the ecological floating island. Specifically, the phosphorus removal sponge pad 2 is fixed on the side of the polyethylene floating board 1 immersed in water. It can be understood that although there is current research on using lanthanum hydroxide materials to absorb phosphorus in water, due to its particulate powder state, it is easy to lose in water and difficult to achieve efficient phosphorus removal. In this embodiment, by preparing a phosphorus removal sponge pad 2 loaded with nano lanthanum hydroxide, the problem of easy loss of lanthanum hydroxide powder in water is effectively solved.

[0052] As Figure 1 and Figure 2 shown, the algae control unit includes a light guide tube 3, a photocatalytic chamber 4, and a photocatalytic material (not shown in the figure) disposed in the photocatalytic chamber 4. A first through hole 5 is provided on the polyethylene floating board 1, and a second through hole 6 is provided on the phosphorus removal sponge pad 2. The first through hole 5 and the second through hole 6 coincide with each other; the head end of the light guide tube 3 passes through the second through hole 6 and the first through hole 5 and exposes above the water surface, and the tail end of the light guide tube 3 is fixed on the photocatalytic chamber 4; the light guide tube 3 is used to introduce natural light on the water surface into the underwater photocatalytic chamber 4.

[0053] It can be understood that the present application provides a multi-effect phosphorus removal and algae control device, which combines an ecological floating island, a phosphorus removal unit and an algae control unit to form a comprehensive water treatment system. Phosphorus-absorbing plants are planted on the ecological floating island, and phosphorus in water is removed through biological absorption; the phosphorus removal unit uses a phosphorus removal sponge pad 2 loaded with nano lanthanum hydroxide to further enhance the phosphorus removal effect; the algae control unit uses the light guide tube 3 to introduce natural light into the underwater photocatalytic chamber 4 to activate the photocatalytic material (such as carbon nitride), effectively inhibiting the growth of algae. The multi-effect phosphorus removal and algae control device greatly improves the efficiency of phosphorus removal and algae control through the synergistic effect of physical, chemical and biological methods, effectively controlling the phosphorus content and the number of algae in water. This solution not only solves the limitations of single means of traditional methods, but also improves the overall effect of water treatment, provides strong support for improving water quality and protecting the water ecological environment, and has broad application prospects.

[0054] In an alternative embodiment of the present application, the preparation method of the phosphorus removal sponge pad 2 loaded with nano lanthanum hydroxide specifically includes the following steps S11 to S16.

[0055] S11, Prepare a lanthanide compound solution by stirring and dissolving lanthanum nitrate, lanthanum chloride and lanthanum sulfate, and control the concentration of the solution at 0.1 mol / L to 0.3 mol / L.

[0056] S12, Add an alkaline substance to the lanthanide compound solution to create an alkaline condition, so that the pH value of the added lanthanide compound solution is between 8.0 and 10.0. The alkaline substances include sodium hydroxide and potassium hydroxide.

[0057] S13. Heat-treat the lanthanide compound solution under alkaline conditions until the lanthanide compound is completely formed into a La(OH)₃ slurry. The heating temperature is controlled between 80 °C and 100 °C, and the reaction duration is between 0.5 hour and 2.0 hours.

[0058] S14. Immerse the sponge pad in the La(OH)₃ slurry and stir for a duration between 0.5 hour and 2.0 hours. After complete mixing, place it in an ultrasonic machine for ultrasonic treatment, and the ultrasonic treatment duration is between 0.5 hour and 1.0 hour.

[0059] S15. Fish out the sponge pad loaded with La(OH)₃ and slowly stir it in deionized water to wash away the excess La(OH)₃.

[0060] S16. Dry the washed sponge pad to obtain a phosphorus-removing sponge pad loaded with nano lanthanum hydroxide. The drying temperature is between 50 °C and 70 °C.

[0061] In an alternative embodiment of the present application, the photocatalytic material is used to receive the natural light transmitted by the light guide tube 3, thereby catalyzing the generation of free radicals from ozone in the air, and using the strong oxidation of the free radicals to cleave algal cells; at least one small hole is distributed on the photocatalytic cavity 4 for diffusing the free radicals into the water body.

[0062] In an alternative embodiment of the present application, the photocatalytic material is graphitic carbon nitride (g-C₃N₄) prepared by a thermal polymerization method using melamine as a raw material.

[0063] It can be understood that although some studies in the prior art use the photocatalytic effect of TiO₂ to control algae, and cleave algal cells through the strong oxidation of free radicals to achieve effective algae control, the TiO₂ material only uses ultraviolet light as a light source, which greatly affects the light absorption rate of the catalyst. To solve the above problems, in this embodiment, micron-scale graphitic carbon nitride (g-C₃N₄) synthesized from melamine is used as the photocatalytic material. Natural light is transmitted through the light guide tube 3 to catalyze the generation of free radicals from ozone in the air, and the strong oxidation of the free radicals is used to cleave algal cells to achieve effective algae control. This photocatalytic material has the advantages of adjustable energy band structure, easy synthesis, low price, high chemical stability, etc., and there is no risk of secondary pollution. This solution not only greatly reduces the preparation cost, improves the treatment stability, but also realizes the low-carbon, green, and friendly operation of the algae removal unit without using electric energy, providing an efficient and environmentally friendly new way for water body algae control.

[0064] In an alternative embodiment of the present application, the preparation method of graphitic carbon nitride (g-C₃N₄) includes steps S21 to S23.

[0065] S21. Mix melamine and phosphorous acid in a mass ratio of 5:3 to 5:4, add deionized water, stir at 55°C to 65°C for 0.5 hour to 1.5 hours. After the phosphorous acid is completely dissolved and the melamine is evenly dispersed in the solution, transfer the mixture to a stainless steel reactor and heat and react at 175°C to 185°C for 8 hours to 12 hours to obtain a carbon nitride precursor.

[0066] S22. Wash the precursor with pure water 3 to 5 times, and then wash the precursor with ethanol 1 to 3 times to completely remove the impurities on the surface of the precursor. Then place the washed precursor at 55°C to 65°C for drying.

[0067] S23. Place the dried precursor in an inert gas (such as nitrogen, argon, helium, etc.) atmosphere and perform high-temperature heat treatment at 500°C to 600°C to self-assemble into micron-scale graphitic carbon nitride.

[0068] In an alternative embodiment of the present application, as Figure 3 shown, the head end of the light guide tube is a spherical surface 7 protruding away from the water surface. The protruding spherical surface 7 has the function of converging light beams, which is beneficial to collecting natural light within a larger angular range for the catalytic reaction.

[0069] In an alternative embodiment of the present application, as Figure 4 shown, the tail end of the light guide tube is a concave surface 8 recessed towards the head end. The concave surface 8 has the function of diverging light beams, and can effectively diffuse the light beams transmitted in the light guide tube 3 into the photocatalytic cavity 4 for the catalytic reaction.

[0070] In an alternative embodiment of the present application, when the head end of the light guide tube is an inclined plane, as Figure 6 shown, a stator ring 9 is also fixed in the first through hole 5. Coil through holes are provided on the side wall of the stator ring 9 for accommodating the driving coil 10; a rotor ring 11 is fixed on the outer side of the head end of the light guide tube 3. Magnets 12 are embedded in the rotor ring 11. The magnets 12 include S poles and N poles arranged side by side. When a clockwise current is generated in the driving coil 10, the magnets 12 drive the rotor ring 11 to rotate in the first direction (as shown by the a direction in the figure). When a counterclockwise current is generated in the driving coil 10, the magnets 12 drive the rotor ring 11 to rotate in the second direction opposite to the first direction (as shown by the b direction in the figure).

[0071] It can be understood that when the head end of the light guide tube 3 is an inclined plane, the light beams collected by the light guide tube 3 have a certain angular tendency. As Figure 5 shown, the driving coil 10 can be controlled to generate a corresponding clockwise current or counterclockwise current according to the current illumination direction of the sunlight, so that the magnets 12 drive the rotor ring 11 to rotate, thereby driving the inclined plane of the light guide tube 3 to rotate to the corresponding angle to collect the current sunlight within the largest range.

[0072] In an alternative embodiment of the present application, the multi-effect phosphorus removal and algae control device includes: a processor and a signal receiver; the signal receiver is configured to receive an instruction for controlling the turning of the light guide tube 3, and the processor is electrically connected to the drive coil 10 and is configured to control the drive coil 10 to generate a corresponding drive current according to the instruction.

[0073] In an alternative embodiment of the present application, the multi-effect phosphorus removal and algae control device includes: a processor and a light sensing device; the light sensing device is laid on the polyethylene floating board 1, and the processor is electrically connected to the drive coil 10 and is configured to analyze the current light direction according to the feedback signal of the light sensing device and control the drive coil 10 to generate a corresponding drive current corresponding to the current light direction.

[0074] It should be understood that in the embodiments of the present invention, the so-called processor may be a central processing unit (CPU), and this processor may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or this processor may also be any conventional processor, etc.

[0075] In the various embodiments of the present disclosure, the expressions "first", "second", "the first" or "the second" used may modify various components and have nothing to do with the order and / or importance, but these expressions do not limit the corresponding components. The above expressions are only configured for the purpose of distinguishing an element from other elements. For example, the first user device and the second user device represent different user devices, although both are user devices. For example, without departing from the scope of the present disclosure, the first element may be referred to as the second element, and similarly, the second element may be referred to as the first element.

[0076] When an element (e.g., a first element) is referred to as being “(operatively or communicatively) coupled” or “(operatively or communicatively) coupled to” or “connected to” another element (e.g., a second element), it should be understood that the one element is directly connected to the other element or the one element is indirectly connected to the other element via yet another element (e.g., a third element). Conversely, it can be understood that when an element (e.g., a first element) is referred to as being “directly connected” or “directly coupled” to another element (a second element), then no element (e.g., a third element) is inserted therebetween.

[0077] It should be noted that, in this text, the term “comprising”, “including” or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or apparatus that comprises a series of elements includes not only those elements but also other elements not expressly listed, or elements that are inherent to such process, method, article or apparatus. Without further limitation, an element defined by the statement “comprising a...” does not exclude the presence of additional identical elements in the process, method, article or apparatus that comprises the element. In addition, components, features, elements with the same name in different embodiments of the present application may have the same meaning or may have different meanings, and their specific meanings need to be determined according to their explanations in the specific embodiments or further in combination with the context in the specific embodiments.

[0078] The above description is only an alternative embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, technical solutions formed by mutually replacing the above features with (but not limited to) technical features having similar functions disclosed in the present application.

[0079] Depending on the context, the words “if”, “when” as used herein can be interpreted as “when” or “while” or “in response to determining” or “in response to detecting”. Similarly, depending on the context, the phrase “if determined” or “if detected (stated condition or event)” can be interpreted as “when determined” or “in response to determining” or “when detected (stated condition or event)” or “in response to detecting (stated condition or event)”.

[0080] The above description is only an optional embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

[0081] The above is only an optional embodiment of the present application and is not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-effect phosphorus removal and algae control device, characterized in that: include: Ecological floating islands floating on the water surface and phosphorus removal units and algae control units submerged in the water; The ecological floating island includes a polyethylene floating board and phosphorus-absorbing plants inserted on the polyethylene floating board; The phosphorus removal unit comprises a phosphorus removal sponge pad loaded with nano-lanthanum hydroxide, and the phosphorus removal sponge pad is fixed on the surface of the ecological floating island facing underwater; The algae control unit includes a light guide, a photocatalytic cavity and a photocatalytic material arranged in the photocatalytic cavity; a first through hole is arranged on the polyethylene floating plate, a second through hole is arranged on the phosphorus removal sponge pad, and the first through hole and the second through hole overlap with each other; the head end of the light guide passes through the second through hole and the first through hole to expose the water surface, and the tail end of the light guide is fixed on the photocatalytic cavity; the light guide is used to guide natural light on the water surface into the underwater photocatalytic cavity.

2. The multi-effect phosphorus removal and algae control device according to claim 1, characterized in that: The preparation method of the dephosphorization sponge pad loaded with nano-lanthanum hydroxide comprises: A lanthanide compound solution is prepared, and heated under alkaline conditions for reaction until the lanthanide completely forms La(OH)3 slurry; a sponge pad is immersed in the La(OH)3 slurry for soaking; the soaked sponge pad is washed and then dried to obtain a dephosphorization sponge pad loaded with nano-lanthanum hydroxide.

3. The multi-effect phosphorus removal and algae control device according to claim 2 is characterized in that: The preparation method of the dephosphorization sponge pad loaded with nano-lanthanum hydroxide specifically comprises the following steps: S11, preparing a lanthanide compound solution by stirring and dissolving lanthanum nitrate, lanthanum chloride and lanthanum sulfate; S12, adding an alkaline substance to the lanthanide compound solution to create an alkaline condition, wherein the alkaline substance includes sodium hydroxide and potassium hydroxide; S13, heating the lanthanide compound solution under alkaline conditions until the lanthanide completely forms a La(OH)3 slurry; S14, immersing the sponge pad in the La(OH)3 slurry, stirring, and after being completely mixed, placing the sponge pad in an ultrasonic machine for ultrasonic treatment; S15, remove the La(OH)3-loaded sponge pad, slowly stir it in deionized water to wash away excess La(OH)3; S16, drying the washed sponge pad to obtain a dephosphorization sponge pad loaded with nano-lanthanum hydroxide.

4. The multi-effect phosphorus removal and algae control device according to claim 1, characterized in that: The photocatalytic material is used to receive the natural light transmitted by the light guide, thereby catalyzing ozone in the air to produce free radicals, and utilizing the strong oxidizing effect of the free radicals to lyse algae cells; at least one small hole is distributed on the photocatalytic cavity, which is used to diffuse the free radicals into the water body.

5. The multi-effect phosphorus removal and algae control device according to claim 4 is characterized in that: The photocatalytic material is graphite phase carbon nitride (g-C3N4) prepared by thermal polymerization using melamine as a raw material.

6. The multi-effect phosphorus removal and algae control device according to claim 5, characterized in that: The preparation method of the graphite phase carbon nitride (g-C3N4) comprises: S21, mixing melamine and phosphorous acid, adding them into deionized water and stirring, and after the phosphorous acid is completely dissolved and the melamine is evenly dispersed in the solution, transferring the mixed solution into a stainless steel reactor and heating the reaction to obtain a carbon nitride precursor; S22, washing the precursor with pure water, and then washing the precursor with ethanol to completely remove impurities on the surface of the precursor, and then drying the washed precursor; S23, placing the dried precursor in an inert gas atmosphere and performing high-temperature heat treatment to allow it to self-assemble into micrometer-sized graphite-phase carbon nitride.

7. The multi-effect phosphorus removal and algae control device according to any one of claims 1 to 6, characterized in that: The phosphorus-absorbing plants include at least one of the following: canna, red water hyacinth, and calamus.

8. The multi-effect phosphorus removal and algae control device according to any one of claims 1 to 6, characterized in that: Include at least one of the following: The head end of the light guide tube is a spherical surface convex in a direction away from the water surface; The tail end of the light guide tube is a concave surface that is sunken toward the head end.

9. The multi-effect phosphorus removal and algae control device according to any one of claims 1 to 6, characterized in that: The head end of the light guide is an inclined surface; a stator ring is also fixed in the first through hole, and a coil through hole is opened on the side wall of the stator ring for accommodating the driving coil; a mover ring is fixed on the outside of the head end of the light guide, and a magnet is embedded in the mover ring. The magnet includes an S pole and an N pole arranged side by side. When the driving coil generates a clockwise current, the magnet drives the mover ring to rotate in a first direction. When the driving coil generates a counterclockwise current, the magnet drives the mover ring to rotate in a second direction opposite to the first direction.

10. The multi-effect phosphorus removal and algae control device according to claim 9, characterized in that: The multi-effect phosphorus removal and algae control device includes at least one of the following: A processor and a signal receiver; the signal receiver is used to receive instructions for controlling the direction of the light guide, and the processor is electrically connected to the drive coil and is used to control the drive coil to generate a corresponding drive current according to the instructions; Processor and photosensitive device; the photosensitive device is laid on the polyethylene floating board, and the processor is electrically connected to the drive coil, and is used to analyze the current lighting direction according to the feedback signal of the photosensitive device, and control the drive coil to generate a corresponding driving current corresponding to the current lighting direction.

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