A nitrogen and phosphorus removal device for aquaculture wastewater

Abstract

This invention provides a nitrogen and phosphorus removal device for aquaculture wastewater, relating to the field of aquaculture. The device includes an electrolytic cell, which is circular and hollow. Electrolytic components are installed inside the cell, and a water conveying mechanism is placed below it. An inlet pipe (A) and an outlet pipe (A) are respectively installed at both ends of the water conveying mechanism. This aquaculture wastewater nitrogen and phosphorus removal device, through the electrolytic components, utilizes the bubbles generated by electrolysis and the action of electrostatic flocculants to flocculate suspended particulate matter and dissolved substances in the water into larger clumps, thereby removing ammonia nitrogen and total phosphorus from the water. Each rotating component generates heat through friction during operation, increasing the temperature of the wastewater inside the electrolytic cell. Because the ionization process is endothermic, the increased temperature enhances the ionization tendency. Furthermore, the dissociation process of water is significantly endothermic, so the increased temperature increases the degree of ionization of the water, thereby improving the reaction efficiency.

Description

Technical Field

[0001] This invention relates to the field of aquaculture, specifically to a nitrogen and phosphorus removal device for aquaculture wastewater. Background Technology

[0002] Aquaculture is the practice of raising aquatic economic animals and plants using aquatic waters available for cultivation (including planting), according to the ecological habits and environmental requirements of the cultivated organisms. It is a sector of agricultural production. Based on the nature of the water body, it is divided into marine aquaculture and freshwater aquaculture. Based on the cultivated or planted organisms, it includes fish, shrimp, crabs, shellfish, algae, water chestnuts, lotus, and lotus roots. The aim is to expand the cultivation area and increase yield per unit area (water body) by vigorously transforming and utilizing all available and potential aquaculture waters; to explore new fields and pathways in aquaculture; to develop factory-style, mechanized, high-density warm-water aquaculture, cage culture (including multi-layered cages), artificial reefs, integrated farming, and mixed aquaculture; to move towards intensive management; and to tap the potential of aquatic production. Finally, it aims to protect aquatic resources and the ecological environment. With the rapid development of the aquaculture industry, aquaculture, an important part of fisheries, is a production industry that utilizes suitable waters to cultivate aquatic economic plants and animals. Humans began engaging in aquaculture later than the fishing industry, which harvests natural aquatic resources. The emergence and development of aquaculture signifies the increased ability of humans to influence and control water bodies. In aquaculture, wastewater generally refers to the wastewater discharged into the environment during aquaculture production, including unconsumed feed and fish and shrimp excrement dissolved in the water. If this wastewater is not treated promptly and effectively, it will not only deteriorate the aquaculture environment but also lead to outbreaks of disease and even large-scale deaths in fish, shrimp, and crabs, directly resulting in a decline in the quality and yield of farmed products. Wastewater treatment is a crucial environmental issue, especially in aquaculture. Treatment methods include physical treatment technologies (such as mechanical filtration and foam separation), chemical treatment technologies (such as the use of ozone or chemical agents), and ecological treatment technologies (such as constructed wetlands and ecological ditches) to reduce pollutants in the wastewater, such as ammonia nitrogen, nitrite, and organic carbon, thereby purifying water quality and optimizing the aquaculture environment.

[0003] Existing nitrogen and phosphorus removal methods mostly employ physical or chemical approaches. Physical methods primarily remove nitrogen and phosphorus from water through filtration, sedimentation, and adsorption. Filtration uses filter media to trap suspended particles and algae, thus removing nitrogen and phosphorus. Sedimentation utilizes gravity to cause nitrogen and phosphorus to settle to the bottom, achieving removal. Adsorption uses adsorbents to adsorb nitrogen and phosphorus from the water, separating them from the water. While these physical methods can effectively reduce the concentration of nitrogen and phosphorus in water, thereby reducing pollution to the aquatic environment, they are still effective methods for removing nitrogen and phosphorus. While water treatment can remove nitrogen and phosphorus, it requires the nitrogen and phosphorus in the water to settle, resulting in low efficiency. Chemical methods mainly utilize the principle of chemical reaction, adding specific chemical agents to convert nitrogen and phosphorus in the water into water-insoluble solids, thereby achieving the effect of nitrogen and phosphorus removal. Commonly used chemical methods include adding magnesium hydroxide, iron salts, and aluminum salts. These chemical agents can react with nitrogen and phosphorus in the water to form water-insoluble precipitates. Although these precipitates can be separated, the reaction time is long, the nitrogen and phosphorus removal efficiency is low, and the treatment of the mixture after the reaction is quite troublesome. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a nitrogen and phosphorus removal device for aquaculture wastewater. It solves the problems that while physical methods can effectively reduce nitrogen and phosphorus concentrations in water and thus reduce water pollution, they require sedimentation of nitrogen and phosphorus substances in the water, resulting in low efficiency. Chemical methods, although capable of separating these substances, require long reaction times, have low nitrogen and phosphorus removal efficiency, and the treatment of the resulting mixtures is cumbersome.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a nitrogen and phosphorus removal device for aquaculture wastewater, comprising an electrolytic cell, the electrolytic cell being circular and hollow inside, an electrolytic assembly installed inside the electrolytic cell, a water conveying mechanism placed below the electrolytic cell, an inlet pipe A and an outlet pipe A respectively installed at both ends of the water conveying mechanism, the water conveying mechanism being able to discharge water from the inlet pipe A through the outlet pipe A when working, an inlet pipe B fixedly connected to the bottom surface of the electrolytic cell, a connecting pipe fixedly connected between the inlet pipe B and the inlet pipe A, an outlet pipe B fixedly connected to the bottom surface of the electrolytic cell, and a drain pipe fixedly connected to the other end of the outlet pipe B, the inlet pipe A being used to pump wastewater, and the drain pipe being used to drain water.

[0006] The electrolysis assembly consists of an anode, four cathodes, and four connecting plates. The anode is fixedly connected to the inner wall of the electrolytic cell. Both ends of each cathode are fixedly connected to the connecting plates adjacent to it. The upper surfaces of the four cathodes and the four connecting plates are fixedly connected to the upper surface of the electrolytic cell. The bottom surfaces of the four cathodes and the four connecting plates are fixedly connected to the bottom surface of the electrolytic cell. The cathodes are connected to the negative terminal of the power supply and the positive terminal of the power supply. The anode can undergo an oxidation reaction, and the cathodes can undergo a reduction reaction.

[0007] Each connecting plate is equipped with a rotating component between itself and the anode. Each rotating component can increase the water supply pressure when it is working, generate heat through friction when it is working, and increase the temperature of the tailwater inside the electrolytic cell.

[0008] A linkage mechanism is installed between the outer shell and the electrolytic cell. The linkage mechanism is used to provide power to the rotating component and can drive the rotating component to rotate.

[0009] Preferably, the anode is annular, each cathode is arc-shaped, each connecting plate is arc-shaped, and the four cathodes and four connecting plates can form an enclosing shape.

[0010] Preferably, the water conveying mechanism consists of a shell, a conveying pipe, a rotating component, a rotating rod, two sets of connecting shafts, and two extrusion rollers. The shell is hollow, and the conveying pipe, rotating component, two connecting shafts, and two extrusion rollers are all located inside the shell. The conveying pipe is a flexible hose that can deform under pressure and return to its original shape when not under pressure. The two ends of the conveying pipe are fixedly connected to water inlet pipe A and water inlet pipe B, respectively. The outer surface of the conveying pipe is fixedly connected to the inner wall of the shell. The outer surface of the rotating rod penetrates the upper surface of the shell and extends to the top of the shell, and is rotatably connected to the shell. Each connecting shaft is rotatably connected to the rotating component, and the two sets of connecting shafts are fixedly connected to the two extrusion rollers, respectively.

[0011] Preferably, each of the rotating components consists of a water wheel and two heating wheels. The two heating wheels are fixedly connected to the upper and lower surfaces of the electrolytic cell, respectively. The water wheel is in close contact with the two heating wheels and is rotatably connected to the two heating wheels. Both the water wheel and the two heating wheels are made of metal iron.

[0012] Preferably, the linkage mechanism consists of a turntable, a ratchet, several pawls, a large gear, four small gears, four rotating rods, and four small shafts. The gear module and pressure angle of the large gear and small gears are equal, and each small gear is meshed with the large gear. The turntable is fixedly connected to the rotating rods, the ratchet is rotatably connected to the turntable, the large gear is located inside the ratchet and is fixedly connected to the ratchet, the four small shafts are rotatably connected to the turntable, the four small shafts are fixedly connected to the four pawls, each pawl is fixedly connected to the turntable with a torsion spring, and each torsion spring is in a charged state. The four rotating rods are fixedly connected to the four small gears, the bottom end of each rotating rod is rotatably connected to the outer shell, the top end of each rotating rod is rotatably connected to the electrolytic cell, the four rotating rods are fixedly connected to the four water wheels, and the four rotating rods are rotatably connected to the four sets of heating wheels.

[0013] Preferably, the outer ring of the turntable is fixedly connected to a bracket, and a slot is opened on the outer surface of the outer shell. The bottom end of the bracket is located inside the slot and is rotatably connected to the inside of the slot. The bracket and the slot are adapted to each other, and both the bracket and the slot are ring-shaped.

[0014] Preferably, a baffle is fixedly connected inside the electrolytic cell. The baffle is fixedly connected to the anode and the cathode adjacent to it. The baffle is located behind the junction of the water inlet pipe B and the electrolytic cell, and is positioned in front of the rotating assembly located on the far right.

[0015] Preferably, the inner wall of the electrolytic cell is fixedly connected with a first filter element, a second filter element, a third filter element and a fourth filter element, all of which are arc-shaped and arranged in a circular pattern.

[0016] Preferably, the filter pores of the first filter element are larger than those of the second filter element, the filter pores of the second filter element are larger than those of the third filter element, the filter pores of the third filter element are larger than those of the fourth filter element, and the first filter element, the second filter element, the third filter element and the fourth filter element have the same shape and size.

[0017] Preferably, a forward and reverse motor is fixedly installed on the bottom surface of the electrolytic cell, and the output shaft of the forward and reverse motor is fixedly connected to the upper end of the rotating rod.

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

[0019] 1. This aquaculture wastewater denitrification and phosphorus removal equipment utilizes an electrolysis component. Through the action of bubbles generated by electrolysis and electrostatic flocculants, suspended particulate matter and dissolved substances in the water are flocculated into larger clumps, thereby removing ammonia nitrogen and total phosphorus from the water. Within the electrolysis component, an external voltage causes the metal ions generated by anode dissolution and the bubbles generated by cathode dissolution to work together to form an electrostatic flocculant. The metal ions generated by anode dissolution can react with anions in the water to form flocculants and also generate cohesive bubbles. Cathode dissolution directly generates bubbles, and the rising of these bubbles carries away the flocculant clumps. In addition to suspended matter, Fe2+ and OH- ions generated by the electrolysis reaction in the electrolytic cell can also chemically react with dissolved ammonia nitrogen and total phosphorus in the water, thereby achieving the removal of ammonia nitrogen and total phosphorus. By setting up rotating components, each rotating component can generate heat through friction during the transportation of tailwater, which can increase the temperature of the tailwater inside the electrolytic cell. Since the ionization process is endothermic, the ionization tendency is enhanced by the increase in temperature. Moreover, the dissociation process of water is significantly endothermic, so the increase in temperature can increase the degree of ionization of water, thereby improving the reaction efficiency and solving the problems mentioned in the background technology.

[0020] 2. This aquaculture wastewater denitrification and phosphorus removal equipment, by starting the forward and reverse motor, can make the rotating rod rotate forward and reverse, so that the wastewater can flow from the inlet pipe A to the outlet pipe A, and also from the outlet pipe A to the inlet pipe A. When the wastewater flows from the inlet pipe A to the outlet pipe A, it can remove nitrogen and phosphorus, and when the wastewater flows from the outlet pipe A to the inlet pipe A, it can recover nitrogen and phosphorus.

[0021] 3. This aquaculture wastewater denitrification and phosphorus removal equipment, by setting up a first filter element, a second filter element, a third filter element and a fourth filter element, all of which are arc-shaped and arranged in a circle, can block particles after the reaction, and the wastewater can be discharged from the filter holes, which can achieve staged filtration, and can also reduce the filtration burden of the second filter element, the third filter element and the fourth filter element. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a cross-sectional view of the front view of the electrolytic cell and water conveying mechanism of the present invention;

[0024] Figure 3 This is a cross-sectional view of the top view of the water conveying mechanism of the present invention;

[0025] Figure 4 This is a cross-sectional view of the top view of the electrolysis assembly of the present invention;

[0026] Figure 5 This is a schematic diagram of the first filter element structure of the present invention;

[0027] Figure 6 This is a top view of the linkage mechanism of the present invention;

[0028] Figure 7 This is a top view of the rotating component of the present invention;

[0029] Figure 8 This is a schematic diagram of the rotating rod and rotating assembly structure of the present invention;

[0030] Figure 9 This is a cross-sectional view of the top view of the rotating component of the present invention;

[0031] Figure 10 This is a cross-sectional view of the top view of the electrolytic cell of the present invention;

[0032] Figure 11 This is a cross-sectional view illustrating the structural diagram of the bending process of the copper and iron sheets in this invention.

[0033] The components include: 1. Electrolytic cell; 2. Electrolysis assembly; 201. Anode; 202. Cathode; 203. Connecting plate; 3. Water conveying mechanism; 301. Outer shell; 302. Conveying pipe; 303. Rotating component; 304. Rotating rod; 305. Connecting shaft; 306. Extrusion wheel; 4. Inlet pipe A; 5. Outlet pipe A; 6. Inlet pipe B; 7. Outlet pipe B; 8. Drain pipe; 9. Rotating assembly; 901. Water wheel; 902. 10. Heating wheel; 10. Linkage mechanism; 101. Turntable; 102. Ratchet; 103. Pawl; 104. Large gear; 105. Small gear; 106. Rotating rod; 107. Small shaft; 11. Torsion spring; 12. Bracket; 13. Forward and reverse motor; 14. Baffle; 15. First filter element; 16. Second filter element; 17. Third filter element; 18. Fourth filter element; 19. Heating plate; 20. Copper sheet; 21. Iron sheet. Detailed Implementation

[0034] Example 1:

[0035] like Figures 1-9As shown, a nitrogen and phosphorus removal device for aquaculture wastewater includes an electrolytic cell 1, which is circular and hollow inside. An electrolytic assembly 2 is installed inside the electrolytic cell 1 and is connected to an external power source. The power source provides electrical energy to the electrolytic assembly 2, which is the power source for the operation of the electrolytic cell 1. A water conveying mechanism 3 is placed below the electrolytic cell 1. Multiple circumferentially arranged support rods are fixedly connected between the water conveying mechanism 3 and the electrolytic cell 1. The water conveying mechanism 3 consists of a shell 301, a conveying pipe 302, a rotating component 303, a rotating rod 304, two sets of connecting shafts 305, and two extrusion rollers 306. The two ends of the shell 301 are convex, and the interior of the shell 301 is hollow. The conveying pipe 302, rotating component 303, two connecting shafts 305, and two extrusion rollers 306 are all located inside the outer casing 301. The conveying pipe 302 is a flexible hose that can deform under pressure and return to its original shape when no pressure is applied. Both ends of the conveying pipe 302 are fixedly connected to the water inlet pipe A4 and water inlet pipe B6, respectively. The outer surface of the conveying pipe 302 is fixedly connected to the inner wall of the outer casing 301. The outer surface of the rotating rod 304 penetrates the upper surface of the outer casing 301 and extends above it, rotatably connecting to the outer casing 301. Each connecting shaft 305 is rotatably connected to the rotating component 303. The two sets of connecting shafts 305 are fixedly connected to the two extrusion rollers 306, respectively. When the rotating component 303 rotates, it enables the two extrusion rollers 306 to rotate circumferentially, thereby allowing the extrusion rollers 306 to transport the tailwater through the extrusion conveying pipe 302. The water conveying mechanism 3 has an inlet pipe A4 and an outlet pipe A5 installed at both ends. When the water conveying mechanism 3 is working, it can discharge the water in the inlet pipe A4 from the outlet pipe A5. The bottom surface of the electrolytic cell 1 is fixedly connected to an inlet pipe B6, and a connecting pipe is fixedly connected between the inlet pipe B6 and the inlet pipe A4. The bottom surface of the electrolytic cell 1 is fixedly connected to an outlet pipe B7, and the other end of the outlet pipe B7 is fixedly connected to a drain pipe 8. The inlet pipe A4 is used to pump tailwater, and the drain pipe 8 is used to drain water. The drain pipe 8 is an L-shaped flexible hose. The inner wall of the electrolytic cell 1 is fixed... The filter is fixedly connected with a first filter element 15, a second filter element 16, a third filter element 17, and a fourth filter element 18. The first filter element 15, the second filter element 16, the third filter element 17, and the fourth filter element 18 are all arc-shaped and arranged in a circle, which can block the particles after the reaction, and the tail water can be discharged from the filter holes. The filter holes of the first filter element 15 are larger than those of the second filter element 16, the filter holes of the second filter element 16 are larger than those of the third filter element 17, and the filter holes of the third filter element 17 are larger than those of the fourth filter element 18. The first filter element 15, the second filter element 16, the third filter element 17, and the fourth filter element 18 have the same shape and size, which can realize staged filtration and reduce the filtration burden of the second filter element 16, the third filter element 17, and the fourth filter element 18.

[0036] Electrolysis assembly 2 consists of an anode 201, four cathodes 202, and four connecting plates 203. The anode 201 is fixedly connected to the inner wall of electrolysis cell 1. Both ends of each cathode 202 are fixedly connected to the adjacent connecting plate 203. The upper surfaces of the four cathodes 202 and the four connecting plates 203 are fixedly connected to the upper surface of electrolysis cell 1, and the bottom surfaces of the four cathodes 202 and the four connecting plates 203 are fixedly connected to the bottom surface of electrolysis cell 1. The cathode 202 is the positive electrode; electrons flow from the negative electrode to the positive electrode, and current flows from the positive electrode to the negative electrode. Cations in the tailwater of aquaculture move towards the positive electrode, and anions move towards the negative electrode. The cathode 202 is connected to the negative terminal of the power supply, and the cathode 202 is connected to the positive terminal of the power supply. The anode 201 can undergo oxidation, and the cathode 202 can undergo reduction. The anode 201 is annular, and each cathode 202 is... The four cathodes 202 and the four connecting plates 203 are arc-shaped, forming an encircling shape. The tailwater in aquaculture can flow between the anode 201, the four cathodes 202 and the four connecting plates 203. By setting the anode 201 to be annular and each cathode 202 to be arc-shaped, the annular and arc-shaped shapes can increase the contact area with the tailwater, thereby improving the reaction efficiency. A baffle 14 is fixedly connected inside the electrolytic cell 1. The baffle 14 is fixedly connected to the anode 201 and the cathode 202 that is close to it. The baffle 14 is located behind the intersection of the water inlet pipe B6 and the electrolytic cell 1, and is set in front of the rotating component 9 located on the far right. The baffle 14 can block the water inside the electrolytic cell 1, so that the transported tailwater can flow in one direction and prevent backflow when transporting tailwater.

[0037] A rotating assembly 9 is installed between each connecting plate 203 and the anode 201. Each rotating assembly 9 increases the water supply pressure and generates heat through friction during operation, thereby increasing the temperature of the tailwater inside the electrolytic cell 1. Since the ionization process is endothermic, the ionization tendency is enhanced by increasing the temperature. Moreover, the dissociation process of water is significantly endothermic, so the increase in temperature can increase the degree of ionization of water, thereby improving the reaction efficiency. Each rotating assembly 9 consists of a water wheel 901 and two heating wheels 902. The two heating wheels 902 are fixedly connected to the upper and lower surfaces of the electrolytic cell 1, respectively. The water wheel 901 is in close contact with the two heating wheels 902 and is rotatably connected to the two heating wheels 902. The water wheel 901 and the two heating wheels 902 are both made of metal iron. When the water wheel 901 rotates, it can not only transport water but also increase the water flow speed. By setting the water wheel 901 and the two heating wheels 902 to be made of metal iron, it is easier to generate heat when friction occurs between the water wheel 901 and the two heating wheels 902.

[0038] A linkage mechanism 10 is installed between the outer casing 301 and the electrolytic cell 1. The linkage mechanism 10 provides power to the rotating component 9 and drives the rotating component 9 to rotate. The linkage mechanism 10 consists of a turntable 101, a ratchet 102, several pawls 103, a large gear 104, four small gears 105, four rotating rods 106, and four small shafts 107. The gear module and pressure angle of the large gear 104 and the small gears 105 are equal, and each small gear 105 is meshed with the large gear 104. The turntable 101 is fixedly connected to the rotating rod 304, the ratchet 102 is rotatably connected to the turntable 101, the large gear 104 is located inside the ratchet 102, and the large gear 104 is fixedly connected to the ratchet 102. The four small shafts 107 are all connected to the turntable 101. 01 Rotary connection, four small shafts 107 are fixedly connected to four pawls 103 respectively, each pawl 103 is fixedly connected to a torsion spring 11 between it and the turntable 101, each torsion spring 11 is in a charged state, four rotating rods 106 are fixedly connected to four small gears 105 respectively, the bottom end of each rotating rod 106 is rotatably connected to the outer casing 301, the upper end of each rotating rod 106 is rotatably connected to the electrolytic cell 1, the intersection of the upper end of each rotating rod 106 and the electrolytic cell 1 is sealed, the four rotating rods 106 are fixedly connected to four water wheels 901 respectively, the four rotating rods 106 are rotatably connected to four sets of heating wheels 902 respectively, when the rotating rod 304 rotates, it can drive the turntable 101 to rotate, the turntable 101 can adjust multiple pawls 103. 03. When the pawl 103 rotates and engages inside the ratchet 102, multiple pawls 103 can push the ratchet 102 to rotate, which in turn causes the ratchet 102 to drive the large gear 104 to rotate. The large gear 104 can drive the small gear 105 to rotate, and the small gear 105 can drive the rotating rod 106 to rotate, which in turn causes the water wheel 901 to rotate. Moreover, the large gear 104 has a longer circumference than the small gear 105. Therefore, when the large gear 104 rotates once, each small gear 105 meshing with the large gear 104 moves a greater distance, which makes the water wheel 901 rotate faster. This allows the water wheel 901 to generate heat through sufficient friction with the heating wheel 902, increasing the heating rate. When the turntable 101 rotates in the opposite direction, the pawl 103 can stop. The ratchet 102 is provided with a driving force, which helps to reduce the water flow speed. A bracket 12 is fixedly connected to the outer ring of the turntable 101. A slot is opened on the outer surface of the outer shell 301. The bottom end of the bracket 12 is located inside the slot and is rotatably connected to the inside of the slot. The bracket 12 and the slot are adapted to each other, and both the bracket 12 and the slot are annular. When the turntable 101 rotates, it can drive the bracket 12 to rotate. The bracket 12 can rotate stably along the inside of the slot, thereby making the rotation of the turntable 101 more stable and preventing the turntable 101 from shaking when rotating. The bracket 12 can also provide support for the turntable 101. A forward and reverse motor 13 is fixedly installed on the bottom surface of the electrolytic cell 1. The output shaft of the forward and reverse motor 13 is fixedly connected to the upper end of the rotating rod 304.The forward and reverse motor 13 provides power for the rotation of the rotating rod 304; it can drive the rotating rod 304 to rotate in both directions.

[0039] In use, first insert the outermost end of the inlet pipe A4 into the tailwater of aquaculture, then start the forward and reverse motor 13 to drive the rotating rod 304 to rotate. The rotating rod 304 drives the turntable 101 and the rotating component 303 to rotate. When the rotating component 303 rotates, it can drive the two sets of small shafts 107 to rotate around the rotating rod 304. The two sets of small shafts 107 drive the two extrusion rollers 306 to rotate respectively. When the two extrusion rollers 306 rotate, they will repeatedly squeeze the water supply pipe. The water in the inlet pipe A4 will enter the water supply pipe. The water in the water supply pipe will be squeezed into the outlet pipe A5. The water in the outlet pipe A5 will enter the inlet pipe B6. The water in the inlet pipe will enter the electrolytic cell 1. The tailwater is located between the four cathodes 202 and the four connecting plates 203 and the anode 201, and flows in a circumferential direction. When the water flows into the outlet pipe B7, the water can be discharged from the drain pipe 8. The external water tank can be connected to the drain pipe 8.

[0040] Immediately afterward, when the forward and reverse motor 13 starts, the external power supply is simultaneously activated to pressurize the electrolysis component 2. The cathode 202 and anode 201, through the action of bubbles generated by electrolysis and electro-flocculating agents, flocculate the particulate matter and dissolved substances suspended in the water into larger clumps, thereby achieving the removal of ammonia nitrogen and total phosphorus in the water. Electro-flocculation is achieved in the electrolysis cell 1 by applying an external voltage to dissolve the metal ions generated by the anode 201 and the bubbles generated by the cathode 202, forming an electro-flocculating agent. The metal ions generated by the anode 201 have two functions: first, to form flocculants with anions in the water; and second, to generate cohesive bubbles. The cathode 202 dissolves directly to generate bubbles, and the rising of these bubbles carries away the flocculant clumps and suspended matter. Furthermore, the Fe2+ and OH- ions generated by the electrolysis reaction in the electrolysis cell 1 can chemically react with the dissolved ammonia nitrogen and total phosphorus in the water, thus also achieving the removal of ammonia nitrogen and total phosphorus.

[0041] The reaction of dissolved metal ions with ammonia nitrogen: Metal ions such as Fe2+ and Al3+ generated by the dissolution of anode 201 have the property of reacting with dissolved ammonia nitrogen. By reacting with NH4+ or NH3 in the dissolved ammonia nitrogen, insoluble ammonia nitrogen solid particles are generated, thereby achieving the removal of ammonia nitrogen. Fe2+ reacts with NH4+ to generate Fe(OH)2(NH3)2. Fe(OH)2(NH3)2 further reacts with oxygen to generate Fe(OH)3, thereby forming an insoluble precipitate.

[0042] The generation of hydrated iron ions: Fe2+ ions generated in electrolytic cell 1 can easily form complex clusters with water molecules in water. These complex clusters contain many water molecules and are also hydrated iron ions. Hydrated iron ions have a strong complexing ability and can form complexes with anions in dissolved ammonia nitrogen, thereby reducing the concentration of dissolved ammonia nitrogen and thus achieving the removal of ammonia nitrogen.

[0043] Bubbles are generated in electrolytic cell 1: the bubbles generated by the dissolution of cathode 202 carry, adsorb and aggregate surrounding suspended particles through the rising action of the bubbles, forming flocculant agglomerates. The movement of the bubbles can also generate water flow shear force, which promotes the formation and enlargement of flocculants.

[0044] The role of bubbles: During the rising process of bubbles generated by electrolysis, bubble shearing, bubble collision, and bubble compression are generated, thereby promoting the formation and enlargement of flocs. The role of bubbles is mainly threefold: First, small flocs are captured on the bubble surface to form larger clumps; second, the rising of bubbles can create local flow, promoting the collision and aggregation of flocs and clumps with other particles; and third, the compression between bubbles and flocs can also enlarge the clumps, forming larger flocs.

[0045] The reaction of dissolved metal ions with total phosphorus: Metal ions (such as Fe2+, Al3+, etc.) generated by the dissolution of anode 201 can react chemically with phosphate ions in total phosphorus in water to form insoluble phosphate precipitates, thereby achieving the removal of total phosphorus. Fe2+ reacts with phosphate ions to form FePO4, and Al3+ reacts with phosphate ions to form AlPO4. These precipitates can be carried away along with other solid particles.

[0046] Bubbles are generated in electrolytic cell 1: The bubbles generated by the dissolution of cathode 202, through their rising action, drag, adsorb, and aggregate surrounding particles, forming flocculant clumps. During their ascent, the bubbles not only carry away suspended particles from the water but also create a dissolved oxygen concentration gradient, promoting the diffusion of oxygen into iron and aluminum ions within electrolytic cell 1. Through the action of these bubbles, the dissolved oxygen concentration in electrolytic cell 1 is increased, thereby promoting the reaction of iron and aluminum ions with total phosphorus to form precipitates, achieving the removal of total phosphorus.

[0047] Next, as the water flows, it passes through the first filter element 15, the second filter element 16, the third filter element 17, and the fourth filter element 18. These filter elements are all arc-shaped and arranged circumferentially, effectively blocking particles after the reaction. The wastewater can be discharged from the filter holes of these elements. Because the filter holes of the first filter element 15 are larger than those of the second filter element 16, the second filter element 16 are larger than those of the third filter element 17, and the third filter element 17 are larger than those of the fourth filter element 18, staged filtration is achieved, reducing the filtration burden on the second filter element 16, the third filter element 17, and the fourth filter element 18. When the turntable 101 rotates, it drives multiple pawls 103 to rotate, which in turn drive the ratchet. The ratchet 102 rotates, driving the large gear 104 to rotate. The large gear 104 drives four small gears 105 to rotate, which in turn drive four rotating rods 106 to rotate. The four rotating rods 106 then drive four water wheels 901 to rotate. When the four water wheels 901 rotate, they not only transport water and further pressurize it, increasing the water flow rate and thus improving the efficiency of nitrogen and phosphorus removal, but also generate heat through friction between the four water wheels 901 and four sets of heating wheels 902, heating the tailwater. This increases the temperature of the tailwater inside the electrolytic cell 1. Since the ionization process is endothermic, the increased temperature strengthens the ionization tendency. Moreover, the dissociation process of water is significantly endothermic, so the increased temperature increases the degree of water ionization, thereby improving the reaction efficiency and solving the problems mentioned in the background technology.

[0048] Next, after the work is completed, the forward and reverse motor 13 is started to drive the rotating rod 304 to reverse. At this time, multiple pawls 103 reverse, and the ratchet 102 loses the driving force of the pawls 103, thus stopping its rotation. The four water wheels 901 also stop rotating. The water supply pipe returns the water in the electrolytic cell 1 and backwashes the sediment filtered by the first filter element 15, the second filter element 16, the third filter element 17 and the fourth filter element 18, so that the sediment can flow back. At this time, the outermost end of the water inlet pipe A4 can be placed into the external box to complete the collection.

[0049] Example 2:

[0050] like Figures 10-11As shown, a nitrogen and phosphorus removal device for aquaculture wastewater includes four filter elements: the first filter element 15, the second filter element 16, the third filter element 17, and the fourth filter element 18. Each element is arc-shaped and composed of copper sheets 20 and iron sheets 21, which are fixedly connected. Both the copper and iron sheets 20 and 21 are capable of filtration. Four circumferentially arranged heating plates 19 are fixedly connected to the inner bottom wall of the electrolytic cell 1. These heating plates 19 are made of metal, and each of the four heating plates 19 is connected to one of the four bottom heating plates. The outer surfaces of the heating wheels 902 are in close contact. The four heating plates 19 are fixedly connected to the first filter element 15, the second filter element 16, the third filter element 17, and the fourth filter element 18, respectively. When the four heating wheels 902 located below rotate, they can generate heat by friction against the four heating plates 19, and transfer the heat to the first filter element 15, the second filter element 16, the third filter element 17, and the fourth filter element 18. The first filter element 15, the second filter element 16, the third filter element 17, and the fourth filter element 18 can bend when heated.

[0051] In use, when the rotating rod 304 rotates, it causes the four heating plates 19 located below to rotate. When the four heating wheels 902 located below rotate, they can rub against the four heating plates 19 to generate heat, transferring the heat to the first filter element 15, the second filter element 16, the third filter element 17, and the fourth filter element 18. When the first filter element 15, the second filter element 16, the third filter element 17, and the fourth filter element 18 are heated, the four iron plates 21 and the four copper plates 20 begin to expand due to heat. The copper plates 20 and the iron plates 21 are heated to different degrees. The one that expands more will bend towards the side with less expansion. The copper plate 20 expands more than the iron plate 21. When heated, the bimetallic strip will bend towards the iron plate 21, thereby causing the first filter element 15, the second filter element 16, the third filter element 17, and the fourth filter element 18 to be heated. 16. The third filter element 17 and the fourth filter element 18 can be bent. When bent, gaps can be generated between the first filter element 15, the second filter element 16, the third filter element 17 and the fourth filter element 1 and the inner top wall of the electrolytic cell 1, which is conducive to the passage of tailwater. The faster the rotation speed of the rotating rod 304, the greater the water flow rate. Not only is the water pressure in the electrolytic cell 1 greater and the water conveying efficiency greater, but the faster the rotation speed of the large gear 104 driving the small gear 105, the greater the heat generated by the friction of the heating plate 19. Therefore, the bending amplitude of the iron sheet 21 and the copper sheet 20 is greater. When bent, their arc surface can block the sediment. Moreover, the greater the bending amplitude, the larger the gap generated, which increases the water flow rate and thus improves the water conveying efficiency.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their likenesses.

Claims

1. An apparatus for denitrification and dephosphorization of aquaculture tail water, comprising an electrolytic cell (1), characterized in that: The electrolytic cell (1) is circular and hollow, and the electrolytic cell (1) is internally provided with an electrolysis assembly (2), the lower part of the electrolytic cell (1) is provided with a water delivery mechanism (3), the two ends of the water delivery mechanism (3) are respectively provided with a water inlet pipe A (4) and a water outlet pipe A (5), the water delivery mechanism (3) can discharge water in the water inlet pipe A (4) from the water outlet pipe A (5) when working, the bottom surface of the electrolytic cell (1) is fixedly connected with a water inlet pipe B (6), the water inlet pipe B (6) and the water outlet pipe A (5) are fixedly connected with a connecting pipe, the bottom surface of the electrolytic cell (1) is fixedly connected with a water outlet pipe B (7), the other end of the water outlet pipe B (7) is fixedly connected with a drain pipe (8), the water inlet pipe A (4) is used for pumping tail water, and the drain pipe (8) is used for draining water; The electrolysis assembly (2) is composed of an anode (201), four cathodes (202) and four connecting plates (203), the anode (201) is fixedly connected with the inner wall of the electrolytic cell (1), the two ends of each cathode (202) are fixedly connected with the connecting plate (203) close to the cathode (202), the upper surfaces of the four cathodes (202) and the four connecting plates (203) are fixedly connected with the upper surface of the electrolytic cell (1), the bottom surfaces of the four cathodes (202) and the four connecting plates (203) are fixedly connected with the bottom surface of the electrolytic cell (1), the cathode (202) is connected with the negative electrode of the power supply, and the anode (201) is connected with the positive electrode of the power supply, wherein the anode (201) can undergo oxidation reaction, and the cathode (202) can undergo reduction reaction; Each connecting plate (203) and the anode (201) are provided with a rotating assembly (9), each rotating assembly (9) can increase the water delivery pressure when working, each rotating assembly (9) can generate heat by friction when working, and can increase the temperature of the tail water in the electrolytic cell (1), a linkage mechanism (10) is arranged between the shell (301) of the water delivery mechanism (3) and the electrolytic cell (1), the linkage mechanism (10) is used for providing power for the rotating assembly (9) and can drive the rotating assembly (9) to rotate; the anode (201) is in the form of a circular ring, each cathode (202) is in the form of an arc, each connecting plate (203) is in the form of an arc, the four cathodes (202) and the four connecting plates (203) can form a surrounding state, each rotating assembly (9) is composed of a water wheel (901) and two heat generating wheels (902), the two heat generating wheels (902) are fixedly connected with the upper surface and the bottom surface of the electrolytic cell (1) respectively, the water wheel (901) is in close contact with the two heat generating wheels (902), the water wheel (901) is rotatably connected with the two heat generating wheels (902), and the water wheel (901) and the two heat generating wheels (902) are both made of metal iron.

2. The device for denitrification and dephosphorization of the tail water of aquaculture according to claim 1, characterized in that: The water conveying mechanism (3) is composed of a shell (301), a conveying pipe (302), a rotating part (303), a rotating rod (304), two groups of connecting shafts (305) and two squeezing wheels (306), the inside of the shell (301) is hollow, the conveying pipe (302), the rotating part (303), the two connecting shafts (305) and the two squeezing wheels (306) are located in the inside of the shell (301), the conveying pipe (302) is a hose and can deform under the squeezing force and restore when not under the squeezing force, the two ends of the conveying pipe (302) are fixedly communicated with a water inlet pipe A (4) and a water outlet pipe A (5) respectively, the outer surface of the conveying pipe (302) is fixedly connected with the inner wall of the shell (301), the outer surface of the rotating rod (304) penetrates through the upper surface of the shell (301) and extends above the shell (301) and is rotatably connected with the shell (301), each connecting shaft (305) is rotatably connected with the rotating part (303), and the two groups of connecting shafts (305) are fixedly connected with the two squeezing wheels (306) respectively.

3. The device for denitrification and dephosphorization of the aquaculture tail water according to claim 1, characterized in that: The linkage mechanism (10) is composed of a rotating disc (101), a ratchet wheel (102), a plurality of pawls (103), a large gear (104), four small gears (105), four rotating rods (106) and four small shafts (107), the gear modulus and the pressure angle of the large gear (104) and the small gears (105) are equal respectively, each small gear (105) is rotatably connected with the large gear (104), the rotating disc (101) is fixedly connected with the rotating rod (304), the ratchet wheel (102) is rotatably connected with the rotating disc (101), the large gear (104) is located in the inside of the ratchet wheel (102) and is fixedly connected with the ratchet wheel (102), the four small shafts (107) are rotatably connected with the rotating disc (101), the four small shafts (107) are fixedly connected with the four pawls (103) respectively, a torsion spring (11) is fixedly connected between each pawl (103) and the rotating disc (101), each torsion spring (11) is in a force storage state, the four rotating rods (106) are fixedly connected with the four small gears (105) respectively, the bottom end of each rotating rod (106) is rotatably connected with the shell (301), the upper end of each rotating rod (106) is rotatably connected with the electrolytic cell (1), the four rotating rods (106) are fixedly connected with four water wheels (901) respectively, and the four rotating rods (106) are rotatably connected with four groups of heat generating wheels (902) respectively.

4. The device for denitrification and dephosphorization of the aquaculture tail water according to claim 3, characterized in that: The outer ring of the rotating disc (101) is fixedly connected with a support (12), the outer surface of the shell (301) is provided with a clamping groove, the bottom end of the support (12) is located in the inside of the clamping groove and is rotatably connected with the inside of the clamping groove, the support (12) is matched with the clamping groove, and the support (12) and the clamping groove are both annular.

5. The device for denitrification and dephosphorization of the aquaculture tail water according to claim 1, characterized in that: The electrolytic cell (1) is internally fixedly connected with a baffle (14), the baffle (14) is fixedly connected with the anode (201), and is fixedly connected with the cathode (202) adjacent to the anode (201), the baffle (14) is located at the rear of the intersection of the water inlet pipe B (6) and the electrolytic cell (1), and is located in front of the rightmost rotating assembly (9).

6. The apparatus for denitrification and dephosphorization of the aquaculture tail water according to claim 1, characterized in that: The inner wall of the electrolytic cell (1) is fixedly connected with a first filter element (15), a second filter element (16), a third filter element (17) and a fourth filter element (18), the first filter element (15), the second filter element (16), the third filter element (17) and the fourth filter element (18) are all arc-shaped and arranged in a circle.

7. The apparatus for denitrification and dephosphorization of the aquaculture tail water according to claim 6, characterized in that: The filter hole of the first filter element (15) is larger than that of the second filter element (16), the filter hole of the second filter element (16) is larger than that of the third filter element (17), the filter hole of the third filter element (17) is larger than that of the fourth filter element (18), and the first filter element (15), the second filter element (16), the third filter element (17) and the fourth filter element (18) are the same in shape and size.

8. The apparatus for denitrification and dephosphorization of the aquaculture tail water according to claim 1, characterized in that: The bottom surface of the electrolytic cell (1) is fixedly installed with a forward and reverse motor (13), and the output rotating shaft of the forward and reverse motor (13) is fixedly connected with the upper end of the rotating rod (304).

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