Biological rotating disc combined with sulfur-iron coupling technology and used for treating aquaculture wastewater and method of biological rotating disc

Abstract

The invention provides an aquaculture wastewater treatment biological rotating disc combined with a sulfur-iron coupling technology and a method thereof.The aquaculture wastewater treatment biological rotating disc comprises a box body, the surface of the box body is provided with a biological rotating disc used for degrading organic pollutants in sewage, and one end of the biological rotating disc is provided with an impurity removal mechanism used for removing a large number of particulate matter in the sewage; a discharging mechanism for conveying sewage is mounted at one end of the impurity removal mechanism; a filtering and deoxidizing mechanism for cleaning solid particles in sewage is mounted at one end of the box body, and a purifying mechanism for removing nitrogen and phosphorus is mounted in the box body; the biological rotating disc combined with the sulfur-iron coupling technology and used for aquaculture wastewater treatment and the method thereof have the advantages of being small in occupied area and high in wastewater treatment efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aquaculture wastewater treatment, and particularly relates to a biological rotating disc for aquaculture wastewater treatment combined with a sulfur-iron coupling technology and a method thereof. BACKGROUND

[0002] Aquaculture tail water mainly comes from leftover feed, feces, bottom mud and daily domestic sewage in ponds and pools, and the like. Such wastewater contains a large amount of suspended solids, ammonia nitrogen, nitrite, organic pollutants and phosphorus. In the prior art, a three-pool two-dam process is used to treat wastewater, i.e., a "sedimentation tank + filtration dam + aeration tank + filtration dam + ecological tank", which collects aquaculture tail water and domestic sewage through sewage collection pipe networks laid along the shore, filters water insoluble substances and decomposes water organic matter, and relies on microorganisms growing in the stable pond to treat the wastewater, thereby solving the problem of aquaculture wastewater treatment and disposal. However, the prior art has a large land occupation and requires multiple independent treatment units, which is not conducive to the rational use of land resources, and the treatment effect of each treatment unit is easily affected by external factors, and the denitrification and phosphorus removal effect is poor.

[0003] Since the aquaculture wastewater contains a large amount of ammonia nitrogen, nitrite and phosphorus, the sulfur-iron coupling technology is used to achieve deep denitrification and phosphorus removal. Under the action of sulfur autotrophic denitrifying bacteria, the process uses sulfur as an electron donor to reduce nitrate to nitrogen, and produces H + which can better promote the dissolution of iron, consume the generated H + , ensure the stability of the pH of the effluent, and remove phosphate through the precipitation of the dissolved iron, thereby achieving the purpose of simultaneous deep denitrification and phosphorus removal. However, since the wastewater contains a large amount of impurities, and the sulfur-iron coupling process produces a precipitate, the impurities and the precipitate accumulate and block the voids inside the sulfur-iron coupling filler layer, thereby reducing the wastewater treatment efficiency.

[0004] Therefore, it is necessary to provide a new biological rotating disc for aquaculture wastewater treatment combined with a sulfur-iron coupling technology and a method thereof to solve the above technical problems. SUMMARY

[0005] The present application solves the technical problem of providing a biological rotating disc for aquaculture wastewater treatment combined with a sulfur-iron coupling technology, which has a small land occupation and high wastewater treatment efficiency.

[0006] In order to solve the above technical problems, the application provides a biological turntable for aquaculture wastewater treatment combined with a sulfur-iron coupling technology, which comprises a box body, a biological turntable for degrading organic pollutants in sewage is arranged on the surface of the box body, a dedusting mechanism for removing a large amount of particulate matters in the sewage is arranged at one end of the biological turntable, and a discharging mechanism for conveying the sewage is arranged at one end of the dedusting mechanism; a filtering and deoxidizing mechanism for cleaning solid particulate matters in the sewage is arranged at one end of the box body, the filtering and deoxidizing mechanism comprises a flushing pipe and a partition plate, the partition plate is fixedly connected to the inside of the box body, two layers of third fixed nets are arranged on the side wall of the partition plate, a layer of fine sand layer is arranged between the two layers of third fixed nets, and a plurality of extrusion rods with spherical bodies are arranged on the surface of the fine sand layer and are slidably connected to the inside of the fine sand layer; a plurality of the flushing pipes are fixed to one end of the box body, one of the third fixed nets is fixedly connected to the side wall of the flushing pipe, and the other third fixed net is slidably connected to the inside of the box body; a purifying mechanism for denitrification and phosphorus removal is arranged in the inside of the box body, two layers of fixed plates are arranged in the inside of the box body respectively, a first fixed net is fixedly connected to the bottom end of the fixed plate, and two ends of a plurality of supporting rods are fixedly connected to the first fixed net and the box body respectively; a reciprocating screw is rotatably connected to the side wall of the box body and the fixed plate, and the side wall of the reciprocating screw is threadedly connected to a slide rod; a plurality of second fixed nets are fixedly connected to the side wall of the slide rod; a sulfur-iron coupling layer is arranged between adjacent second fixed nets, and the second fixed nets and the sulfur-iron coupling layer are slidably connected to the first fixed net and the inside of the box body; a plurality of slide blocks with semicircular cross sections are arranged in the first fixed net and the inside of the box body, and the slide blocks are slidably connected to the sulfur-iron coupling layer; a slide sleeve is arranged on the side wall of the partition plate and the fixed plate, and the slide sleeve is slidably connected to the extrusion rod and the slide rod.

[0007] Preferably, the biological turntable comprises a fixed shell, the fixed shell is arranged on the surface of the box body, a fixed shaft and a turntable are rotatably connected to the inside of the cylindrical fixed shell, and a plurality of the turntables are fixedly connected to the side wall of the fixed shaft; a plurality of protrusions and grooves are arranged on the surface of the turntable; the adjacent protrusions are staggered on adjacent two turntables; an air blower is arranged on the surface of the fixed shell, a plurality of air injection pipes are arranged on the surface of the fixed shell and are connected to the air blower; the air injection pipes with wavy surfaces are located between two turntables, and a plurality of through holes are symmetrically arranged on the surface of the air injection pipes.

[0008] Preferably, the impurity removal mechanism comprises an impurity removal box fixed to one end of the fixed shell, and a water inlet pipe mounted on the side wall of the impurity removal box; a rotating shaft and a support net are rotatably connected inside the impurity removal box; a plurality of support nets are fixedly connected to the side wall of the rotating shaft, and a layer of filter gauze is sleeved on the surface of the support net; an inclined guide rail is mounted on the side wall of the impurity removal box, an arc-shaped scraper is fixedly connected to the side wall of the guide rail, and the elastic scraper is slidably connected to the surface of the filter gauze; a curved elastic rod is fixedly connected to the side wall of the guide rail, and one end of the elastic rod abuts against the inner side wall of the scraper.

[0009] Preferably, the feeding mechanism comprises a fixed box, a first gear and a second gear rotatably connected inside the fixed box, and the rotating shaft and the fixed shaft are fixedly connected to the side wall of the first gear; a water inlet cylinder is fixedly connected to the bottom end of the fixed box, a turbine is rotatably connected inside the water inlet cylinder, and the center of the water inlet cylinder is in communication with the inside of the impurity removal box; a water outlet pipe is mounted on the side wall of the water inlet cylinder, and the water outlet pipe communicates with the inside of the filter and deoxidizing mechanism.

[0010] Preferably, one end of the fixed shell is fixedly connected with a baffle, and a driving motor is mounted on the top end of the baffle; the side walls of the driving motor, the fixed shaft and the reciprocating screw are all mounted with chain wheels, and adjacent chain wheels are connected by chains.

[0011] Preferably, the side walls of the second gear and the turbine inside the fixed box are fixedly connected with the chain wheels, adjacent chain wheels are connected by chains, and the diameter of the first gear is much larger than the diameter of the second gear.

[0012] Preferably, the side wall of the baffle and one of the fixed plates is mounted with a communication pipe, the side walls of the baffle, the fixed shell and the impurity removal box are all mounted with sealing bearing sleeves, and the fixed shaft and the rotating shaft are rotatably connected inside the sealing bearing sleeves; a water outlet pipe is mounted on the side wall of the fixed shell, and a sewage pipe is mounted on the bottom end of the fixed shell, the bottom end of the box body and one side of the box body.

[0013] Preferably, a closing block and a fixed sleeve are fixedly connected inside the flushing pipe, a spherical closing rod is slidably connected inside the fixed sleeve, and the closing rod is engaged with the funnel-shaped closing block inside.

[0014] Preferably, a plurality of second compression rods are mounted inside the box body, a first compression rod is slidably connected inside the second compression rod; a spring is mounted inside the second compression rod, the bottom end of the spring is fixedly connected with the first compression rod, and the bottom end of the first compression rod is connected with the third fixed net.

[0015] A kind of aquaculture wastewater treatment method combined with sulfur-iron coupling technology, specifically includes the following steps: Step one: the device is connected to power supply, open the drive motor;The aquaculture sewage is entered into the inside of the impurity removal box through the water inlet main pipe, and the rotating filter gauze removes the impurities in sewage;The filtered water is continuously pushed into the inside of the box by the rotating turbine; Step two: when sewage enters the inside of the box, the fine sand layer filters the impurities in water, and the filtered water enters the first fixed net, and anaerobic bacteria hydrolyze macromolecular insoluble organic matter into small molecular soluble higher fatty acid using dissolved oxygen in wastewater, consume a large amount of dissolved oxygen in wastewater; Step three: the deoxidized sewage enters the inside of the sulfur-iron coupling layer, and under anaerobic conditions, the sewage is treated by denitrification and phosphorus removal;During the process of treating sewage, the second fixed net drives the sulfur-iron coupling layer to move back and forth slowly on the surface of the first fixed net, and due to the block of the sliding block, the position and gap between the particles in the sulfur-iron coupling layer are changed, so that the impurities and precipitates between the particles are discharged;And during the back-and-forth movement of the sulfur-iron coupling layer, the sewage is continuously contacted with the particles, so as to speed up the treatment efficiency of the sewage;The sliding rod drives the extrusion rod to move back and forth in the fine sand layer during the back-and-forth movement, changes the distance between the fine sands, and facilitates the sewage to penetrate the fine sands; Step four: the treated sewage in the inside of the box enters the inside of the biological rotating disc through the communication pipe;When the rotating disc and the biological membrane on its surface are turned into sewage, the biological membrane adsorbs organic pollutants and suspended solids in wastewater, and absorbs dissolved oxygen in the liquid membrane outside the biological membrane, and decomposes organic matter;The air injection pipe injects air into the rotating disc, improves the oxygen supply capacity of the biological membrane, facilitates the biological membrane to degrade the sewage, and the treated sewage is discharged through the water outlet pipe; Step five: after a period of use, open the fixed shell and the sewage discharge pipe at the bottom end of the box, clean the deposits of the fixed shell and the box, and then backflush the fine sand layer.

[0016] Compared with the related art, the biological rotating disc for aquaculture wastewater treatment combined with sulfur-iron coupling technology and the method thereof provided by the present application have the following beneficial effects: The application provides a biological rotating disc combined with a sulfur-iron coupling technology and a method thereof, the inside of a box body is provided with a purification mechanism and a filter deoxidization mechanism, the surface of the box body is provided with a biological rotating disc and a impurity removal mechanism, sewage sequentially passes through the impurity removal mechanism, the filter deoxidization mechanism, the purification mechanism and the biological rotating disc, and is subjected to solid impurity removal, nitrogen and phosphorus removal and organic matter reduction, and the sewage subjected to nitrogen and phosphorus removal enters the inside of the biological rotating disc again, so that the growth of microorganisms in the inside of the biological rotating disc is not affected by ammonia nitrogen, nitrite and phosphorus in the sewage, and the optimal demand environment of different functional microorganisms for pollutant concentration and dissolved oxygen is perfectly realized; the sulfur-iron coupling layer is additionally provided, so that the two technologies are combined, and the TN or TP removal efficiency is improved; the sewage is subjected to solid impurity removal twice and then enters the inside of the sulfur-iron coupling layer, so that the probability of the sulfur-iron coupling layer being blocked is further reduced, and the sewage treatment efficiency is accelerated; and the device has the advantages of compact structure, small occupation area, simple operation and maintenance, low noise, less sludge and the like. In the process that the sulfur-iron coupling layer treats the sewage, the second fixed net drives the sulfur-iron coupling layer to slowly move back and forth on the surface of the first fixed net, when the sulfur-iron coupling layer moves and contacts the sliding block, the sliding block extrudes the sulfur-iron coupling layer, so that the particles in the inside of the sulfur-iron coupling layer move relative to each other, the positions and gaps between the particles are changed, the sewage is facilitated to pass through the gaps between the particles, and with the continuous movement of the particles, the impurities and sediments accumulated between the particles move downward and penetrate the first fixed net and remain at the bottom end of the box body; the side wall of the sliding block is semicircular, so that the particles are facilitated to slide through the side wall of the sliding block and the movement resistance between the particles is reduced; in the process that the sulfur-iron coupling layer moves back and forth, the sulfur-iron coupling layer drives the sewage to continuously contact the particles and microorganisms, so that the sewage treatment efficiency is accelerated; and in the process that the sliding rod moves back and forth, the sliding rod drives the extrusion rod to move back and forth, a plurality of spheres are arranged on the surface of the extrusion rod, the contact area between the extrusion rod and fine sand is increased, in the process that the extrusion rod moves back and forth, the distance between the fine sands is changed, the probability that the impurities in the sewage block the distance between the fine sands is reduced, the sewage is facilitated to penetrate the fine sands, and the sewage treatment efficiency is accelerated. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A structure schematic view of a preferred embodiment of the biological rotating disc combined with the sulfur-iron coupling technology and the method thereof provided by the application; Figure 2 A structure schematic view of the box body and the inside structure of the biological rotating disc; Figure 1 Figure 3 A structure schematic view of the box body and the inside structure of the biological rotating disc; Figure 2 Figure 4 A structure schematic view of the box body and the inside structure of the biological rotating disc; Figure 2 ​​The diagram shows an enlarged view of the structure at point B. Figure 5 for Figure 2 The diagram shows an enlarged view of the structure at point C. Figure 6 for Figure 2 The diagram shown is an enlarged view of the structure at point D. Figure 7 for Figure 1 The image shows a side view of the internal structure of the cleaning box. Figure 8 for Figure 1 The image shows a side view of the internal structure of the fixed shell.

[0018] Numbered in the diagram: 1. Box body; 11. Sewage pipe; 2. Biological rotating disc; 21. Fan; 22. Water outlet pipe; 23. Fixed shell; 24. Drive motor; 25. Chain; 26. Sprocket; 27. Fixed shaft; 28. Rotary disc; 29. ​​Jet pipe; 210. Protrusion; 211. Sleeve; 212. Through hole; 213. Groove; 3. Impurity removal mechanism; 31. Impurity removal box; 32. Main inlet pipe; 33. Rotating shaft; 34. Support mesh; 35. Filter gauze; 36. Guide rail; 37. Scraper; 38. Elastic rod; 4. Purification mechanism; 41. Fixed plate; 42. Slide rod; 43. Reciprocating screw; 44. 45. First fixed net, 46. Slider, 47. Support rod, 48. Sulfur-iron coupling layer, 59. Second fixed net, 50. Filtering and deoxidizing mechanism, 51. Fine sand layer, 52. Extrusion rod, 53. Flushing pipe, 54. Third fixed net, 55. Partition plate, 56. Sealing rod, 57. Fixed sleeve, 58. Sealing block, 59. First compression rod, 510. Spring, 511. Second compression rod, 6. Sliding sleeve, 70. Feeding mechanism, 71. Fixed box, 72. First gear, 73. Second gear, 74. Water inlet cylinder, 75. Turbine, 76. Water outlet pipe, 77. Sealed bearing sleeve, 8. Connecting pipe, 9. Baffle. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Please see Figures 1-8 , Figure 1 A schematic diagram of a preferred embodiment of the biological rotating disc and method for treating aquaculture wastewater using sulfur-iron coupling technology provided by the present invention; Figure 2 for Figure 1 The diagram shows the internal structure of the box and the biological rotating disc. Figure 3 for Figure 2 The diagram shows an enlarged view of the structure at point A. Figure 4 for Figure 2 The diagram shows an enlarged view of the structure at point B. Figure 5 for Figure 2 The diagram shows an enlarged view of the structure at point C.Figure 6 for Figure 2 The diagram shown is an enlarged view of the structure at point D. Figure 7 for Figure 1 The image shows a side view of the internal structure of the cleaning box. Figure 8 for Figure 1The diagram shows a side view of the internal structure of the fixed shell. The biological rotating disc for treating aquaculture wastewater using sulfur-iron coupling technology includes: a housing 1, on the surface of which a biological rotating disc 2 for degrading organic pollutants in the wastewater is mounted; the biological rotating disc 2 includes a fixed shell 23, which is mounted on the surface of the housing 1; a cylindrical fixed shell 23 internally connects a fixed shaft 27 and rotating discs 28; multiple rotating discs 28 are fixedly connected to the sidewall of the fixed shaft 27; multiple protrusions 510 and grooves 213 are provided on the surface of each rotating disc 28; adjacent protrusions 510 are staggered on adjacent rotating discs 28; a blower 21 is mounted on the surface of the fixed shell 23; multiple air jets 29 are mounted on the surface of the fixed shell 23; the air jets 21... 9 connects to the blower 21; the jet pipe 29 with a wavy surface is located between the two turntables 28, and the surface of the jet pipe 29 is symmetrically provided with multiple through holes 212. The bottom end of the jet pipe 29 is fixedly connected to the sleeve 211, and the sleeve 211 is rotatably connected to the fixed shaft 27, so that the rotating fixed shaft 27 provides support for the sleeve 211 and the jet pipe 29, increasing the stability of the jet pipe 29 inside the fixed shell 23; sewage enters the interior of the fixed shell 23, and the fixed shaft 27 drives the multiple turntables 28 to rotate slowly. The turntables 28 alternately contact wastewater and air. After a period of rotation, a layer of biofilm is attached to the surface of the turntables 28.When the rotating disc 28 and its surface biofilm are immersed in wastewater, the biofilm adsorbs organic pollutants and suspended solids from the wastewater and absorbs dissolved oxygen from the liquid film outside the biofilm, decomposing organic matter. Microorganisms use organic matter as nutrients to reproduce during this process. When the rotating disc 28 leaves the water surface and comes into contact with air, the liquid film attached to the outside of the biofilm absorbs oxygen from the air and transfers it to the biofilm and wastewater. The biofilm alternately contacts the wastewater and air, completing a continuous process of oxygen absorption, adsorption, and oxidation decomposition, degrading the organic matter in the wastewater. The surface of the rotating disc 28 is provided with protrusions 510 and grooves 213, increasing the surface area of ​​the rotating disc 28, allowing for more biofilm to adhere to the disc while maintaining a smaller volume. The protrusions 510 are staggered, and the interior of the rotating disc 28 is interconnected through the grooves 213, increasing the wastewater's ability to absorb oxygen. The shear force of the biofilm allows aged and detached biofilm to detach smoothly. Since the biofilm continuously grows between the rotating discs 28 and the discs 28 rotate synchronously, the biofilm between adjacent discs 28 easily adheres to each other, causing blockage inside the discs 28. The air jet pipes 29 are installed between the discs 28. The sidewalls of the air jet pipes 29 are wavy, and the rotating protrusions 510 are offset from the air jet pipes 29. The air jet pipes 29 continuously cut the biofilm between adjacent discs 28, preventing adhesion between the biofilms. The sidewalls of the air jet pipes 29 are symmetrically provided with through holes 212, through which air is sprayed onto the discs 28. The air blows relative to the discs 28, forming convection, improving the oxygen supply to the biofilm, and facilitating the degradation of wastewater by the biofilm.

[0021] One end of the biological rotating disc 2 is equipped with a cleaning mechanism 3 for removing a large amount of particulate matter from wastewater. The biological rotating disc 2 drives the cleaning mechanism 3 to rotate and quickly clean impurities in the wastewater. The cleaning mechanism 3 includes a cleaning box 31, which is fixed to one end of the fixed shell 23, and an inlet main pipe 32 is installed on the side wall of the cleaning box 31. The interior of the cleaning box 31 is rotatably connected to a rotating shaft 33 and a support net 34. Multiple support nets 34 are fixedly connected to the side wall of the rotating shaft 33, and the surface of the support nets 34 is covered with... A layer of filter gauze 35 is installed, and the support net 34 keeps the filter gauze 35 in an open state for easy filtration of sewage; a guide rail 36 is installed at an angle on the side wall of the impurity removal box 31, and a scraper 37 with an arc-shaped side wall is fixedly connected to the side wall of the guide rail 36, and the elastic scraper 37 slides on the surface of the filter gauze 35; an elastic rod 38 with a curved surface is fixedly connected to the side wall of the guide rail 36, and one end of the elastic rod 38 abuts against the inner side wall of the scraper 37; sewage enters the box through the main inlet pipe 32. Inside the waste removal box 31, wastewater passes through multiple layers of filter gauze 35. Most impurities in the wastewater are blocked by the filter gauze 35, and the continuous rotation of the filter gauze 35 brings it into contact with the wastewater at different positions, accelerating the filtration efficiency and reducing the chance of clogging. When the filter gauze 35 rotates counterclockwise and the scraper 37 rotates, the elastic rod 38 squeezes the scraper 37, causing it to press tightly against the surface of the filter gauze 35. This allows the scraper 37 to remove impurities from the surface of the filter gauze 35. The sidewall of the scraper 37 is arc-shaped and inclined, allowing the impurities scraped off by the scraper 37 to slide downwards into the guide rail 36, where they are then discharged. During the rotation of the filter gauze 35, the removal of impurities from the wastewater and the removal of impurities from the surface of the filter gauze 35 are carried out simultaneously, preventing severe clogging and accelerating the filtration efficiency of the filter gauze 35.

[0022] One end of the impurity removal mechanism 3 is equipped with a feeding mechanism 7 for conveying sewage. The bottom end of the fixed box 71 is fixedly connected to the water inlet cylinder 74. The inside of the water inlet cylinder 74 is rotatably connected to a turbine 75. The center of the water inlet cylinder 74 is connected to the inside of the impurity removal box 31. A water outlet pipe 76 is installed on the side wall of the water inlet cylinder 74. The water outlet pipe 76 is connected to the inside of the filtration and deoxygenation mechanism 5. When the turbine 75 rotates rapidly inside the water inlet cylinder 74, it generates suction at the center of the water inlet cylinder 74, drawing the filtered sewage from the impurity removal box 31 into the water inlet cylinder 74. The rapid rotation of the turbine 75 continuously accelerates the water inside the water inlet cylinder 74. The accelerated water continuously enters the inside of the box 1 through the water outlet pipe 76. The water sprayed from the water outlet pipe 76 generates a thrust on the water inside the box 1, pushing the water inside the box 1 through the filtration and deoxygenation mechanism 5 and the purification mechanism 4 in sequence into the inside of the biological rotating disc 2.

[0023] A filtration and deoxygenation mechanism 5 for cleaning solid particles in wastewater is installed at one end of the housing 1. The filtration and deoxygenation mechanism 5 includes a flushing pipe 53 and a partition 55. The partition 55 is fixedly connected to the inside of the housing 1. Two layers of third fixing mesh 54 are provided on the side wall of the partition 55. A layer of fine sand 51 is laid between the two layers of third fixing mesh 54. Multiple spherical extrusion rods 52 are installed on the sliding connection surface inside the fine sand layer 51. Multiple flushing pipes 53 are fixed to one end of the housing 1. One of the third fixing meshes 54 is fixedly connected to the side wall of the flushing pipe 53, and the other third fixing mesh 54 is slidably connected to the inside of the housing 1. The fine sand layer 51 is fixed to the third fixing meshes on both sides. Between 54, as the sewage passes through the fine sand layer 51, particulate impurities in the sewage remain inside the fine sand layer 51, filtering the sewage again. After filtration, the sewage moves downwards into the area below the first fixed net 54. The air below the first fixed net 54 is filled with sewage, and the box 1 is in a sealed state. When the sewage moves below the first fixed net 54, it is in an oxygen-deficient state. Anaerobic bacteria use the dissolved oxygen in the wastewater to hydrolyze large insoluble organic molecules into small soluble higher fatty acids (such as alcohols, aldehydes, and ketones). This process consumes a large amount of dissolved oxygen, thereby reducing the dissolved oxygen concentration of the sewage. After deoxygenation, the sewage enters the area between the partition 55 and the second fixed net 48. During the back-and-forth movement of the slide bar 42, the slide bar 42 drives the extrusion bar 52 to move back and forth. Multiple spheres are installed on the surface of the extrusion bar 52 to increase the contact area between the extrusion bar 52 and the fine sand. During the back-and-forth movement of the extrusion bar 52, the spacing between the fine sand particles is changed, reducing the probability of impurities in the sewage clogging the spacing between the fine sand particles, making it easier for the sewage to pass through the fine sand particles, and accelerating the sewage treatment efficiency.

[0024] The purification mechanism 4 for nitrogen and phosphorus removal is installed inside the housing 1. The purification mechanism 4 includes a fixing plate 41, which is installed on two layers inside the housing 1. The bottom of the fixing plate 41 is fixedly connected to a first fixing net 44. The two ends of multiple support rods 46 are fixedly connected to the first fixing net 44 and the housing 1, respectively. A reciprocating screw 43 is rotatably connected to the side wall of the housing 1 and the fixing plate 41. The side wall of the reciprocating screw 43 is threadedly connected to a sliding rod 42. Multiple second fixing nets 48 are fixedly connected to the side wall of the sliding rod 42. A sulfur-iron coupling layer 47 is laid between adjacent second fixing nets 48. The second fixing nets 48 and the sulfur-iron coupling layer are connected together. The first fixing net 44 and the interior of the box 1 are slidably connected. The second fixing net 78 divides the sulfur-iron coupling layer 47 into several segments to facilitate the movement of the sulfur-iron coupling layer 47. Multiple sliders 45 with semi-circular cross sections are installed inside the first fixing net 44 and the box 1, and the sliders 45 are slidably connected to the sulfur-iron coupling layer 47. Sliding sleeves 6 are installed on the side walls of the partition plate 55 and the fixing plate 41. The extrusion rod 52 and the sliding rod 42 are slidably connected inside the sliding sleeve 6. In order to facilitate the fixing of the extrusion rod 52 and the sliding rod 42 by the sliding sleeve 6, the extrusion rod 52 and the sliding rod 42 can move linearly.After deoxygenation, the wastewater enters the space between the partition 55 and the second fixed net 48. The space between the partition 55 and the second fixed net 48 allows the wastewater to penetrate the second fixed net 48 and enter the interior of the sulfur-iron coupling layer 47. The sulfur-iron coupling layer 47 is composed of elemental sulfur, limestone, and pyrite, with elemental sulfur accounting for 50%-70% by mass, limestone accounting for 15%-20% by mass, and pyrite accounting for 10%-25% by mass. Limestone provides the calcium source for the growth of sulfur-autotrophic denitrifying bacteria. Elemental sulfur and sulfur... Iron ore serves as the primary electron donor, enabling deep nitrogen and phosphorus removal from wastewater through sulfur-iron coupling technology. Elemental sulfur, limestone, and pyrite are all spherical particles, increasing their surface area and facilitating the growth of sulfur-autotrophic denitrifying bacteria on the particle surface, while also promoting particle movement within the housing 1. During wastewater treatment in the sulfur-iron coupling layer 47, the reciprocating screw 43 rotates, driving the slide bar 42 and the second fixed mesh 48 to move back and forth continuously within the housing 1 using the principle of helical transmission. Furthermore, the movement distance is relatively small; during the operation of the second fixed net 48, the sulfur-iron coupling layer 47 is pushed to move slowly back and forth on the surface of the first fixed net 44. When the sulfur-iron coupling layer 47 moves and contacts the slider 45, the slider 45 squeezes the sulfur-iron coupling layer 47, causing the particles inside the sulfur-iron coupling layer 47 to move relative to each other, changing the position and gap between the particles, making it easier for sewage to pass through the gap between the particles. With the continuous movement of the particles, the impurities and sediments accumulated between the particles move downwards and pass through the first fixed net 44, remaining at the bottom of the box 1. The side wall of the slider 45 is semi-circular, which makes it easy for the particles to slide across the side wall of the slider 45, reducing the movement resistance between the particles. During the back-and-forth movement of the sulfur-iron coupling layer 47, the particles squeeze the water inside the sulfur-iron coupling layer 47, pushing the sewage to move inside the sulfur-iron coupling layer 47, making the sewage continuously contact the particles, accelerating the sewage treatment efficiency, and the continuous movement of the particles changes the gap between the particles, making it easier for sewage to pass through the sulfur-iron coupling layer 47.

[0025] One end of the fixed housing 23 is fixedly connected to a baffle 9, and a drive motor 24 is installed on the top of the baffle 9. Sprockets 26 are installed on the side walls of the drive motor 24, the fixed shaft 27, and the reciprocating screw 43. Adjacent sprockets 26 are connected by chains 25. In order to facilitate the operation of the drive motor 24 to drive one sprocket 26 to rotate, the other sprockets 26, the fixed shaft 27, and the reciprocating screw 43 are driven to rotate by the chains 25.

[0026] The feeding mechanism 7 includes a fixed box 71. Inside the fixed box 71, a first gear 72 and a second gear 73 are rotatably connected and mesh with each other. The side wall of the rotating shaft 33 is fixedly connected to the first gear 72 and the fixed shaft 27. Inside the fixed box 71, the side walls of the second gear 73 and the turbine 75 are both fixedly connected to the sprockets 26, and adjacent sprockets 26 are connected by chains 25. To facilitate the inclusion of the first gear 72, the second gear 73, the sprockets 26, and the chains 25 in the fixed box 7, and to prevent sewage from contacting the first gear 72, the second gear 73, the sprockets 26, and the chains 25 and affecting their rotation, the rotating shaft 33 drives the first gear 72 and the second gear 73 to rotate during rotation. The diameter of the first gear 72 is much larger than the diameter of the second gear 73. To ensure that the rotational speed of the second gear 73 is much greater than the rotational speed of the first gear 72, the turbine 75 rotates rapidly.

[0027] A connecting pipe 8 is installed between the baffle 9 and the side wall of the fixed plate 41 to allow sewage inside the tank 1 to enter the biological rotating disc 2 through the connecting pipe 8. Sealing bearing sleeves 77 are installed on the side walls of the baffle 9, the fixed shell 23, and the impurity removal box 31. The sealing bearing sleeves internally rotatably connect the fixed shaft 27 and the rotating shaft 33 to provide support for the fixed shaft 27 and the rotating shaft 33, while also preventing sewage from flowing out. A water outlet pipe 22 is installed on the side wall of the fixed shell 23 to facilitate the discharge of sewage treated by the biological rotating disc 2. Sewage discharge pipes 11 are installed at the bottom of the fixed shell 23, the bottom of the tank 1, and one side of the tank 1 to discharge sediments inside the fixed shell 23, the tank 1, and the filtration and deoxygenation mechanism 5.

[0028] The flushing pipe 53 is internally fixedly connected to a sealing block 58 and a fixing sleeve 57. A spherical-topped sealing rod 56 is slidably connected inside the fixing sleeve 57, and the sealing rod 56 engages with the funnel-shaped sealing block 58. Multiple second compression rods 511 are installed inside the housing 1. A first compression rod 59 is slidably connected inside each second compression rod 511. A spring 510 is installed inside each second compression rod 511, and the bottom end of the spring 510 is fixedly connected to the first compression rod 59. The bottom end of the first compression rod 59 is connected to the third fixing net 54. When flushing the fine sand layer 51, the flushing pipe 53 is connected to a water pump. The water pump draws water into the flushing pipe 53, pushing the sealing rod 56 upwards linearly inside the fixing sleeve 57, opening the flushing pipe 53, and allowing water to flow through the flushing pipe 53 into the fine sand layer 51. During the upward movement of water within the fine sand layer 51, the upper third fixed net 54 is pushed upward. The spring 510 contracts, causing the third fixed net 54 to push the first compression rod 59 into the interior of the second compression rod 511. The distance between the two third fixed nets 54 increases, facilitating continuous turbulence of the fine sand within the third fixed nets 54. This allows the water to continuously push impurities inside the fine sand upward, and the water carrying the impurities passes through the third fixed nets 54 and is discharged through the drain pipe 11. After the backflushing of the fine sand layer 51 is completed, the sealing rod 56 moves downward to engage the sealing block 58, sealing the sealing block 58. The spring 510 extends, pushing the first compression rod 59 and the third fixed net 54 downward, causing the third fixed net 54 to compress and flatten the surface of the fine sand layer 51, making the fine sand layer 51 usable again.

[0029] A method for treating aquaculture wastewater using sulfur-iron coupling technology includes the following steps.

[0030] Step 1: Connect the device to an external power source and turn on the drive motor 24. The drive motor 24 drives the fixed shaft 27 and the rotating shaft 33 to rotate counterclockwise. The rotation speed of the fixed shaft 27 is controlled between 0.8 and 3.0 r / min. The aquaculture wastewater enters the interior of the impurity removal box 31 through the main inlet pipe 32. The wastewater passes through multiple layers of filter gauze 35. Most of the impurities in the wastewater are blocked by the filter gauze 35, and the continuously rotating filter gauze 35 comes into contact with the wastewater, so that the filter gauze 35 at different positions comes into contact with the wastewater, thereby accelerating the filtration efficiency of the wastewater and reducing the probability of the filter gauze 35 becoming clogged. The filtered water is drawn into the interior of the inlet cylinder 74 by the rotating turbine 75. The turbine 75 rotates rapidly, continuously increasing the speed of the water inside the inlet cylinder 74. The accelerated water then continuously enters the interior of the box 1 through the outlet pipe 76. Step 2: When the sewage enters the interior of the tank 1 and comes into contact with the fine sand layer 51, the particulate impurities in the sewage remain inside the fine sand layer 51, filtering the sewage again; the spring 510 is always in a compressed state, so that the third fixed net 54 on the surface always presses the fine sand layer 51 downward, making the surface of the fine sand layer 51 flat, which is convenient for filtering sewage; after filtration, the sewage moves downward and enters below the first fixed net 54. The air below the first fixed net 54 is filled with sewage, and the tank 1 is in a sealed state. When the sewage moves below the first fixed net 54, it is in an oxygen-deficient state. Anaerobic bacteria use the dissolved oxygen in the wastewater to hydrolyze large insoluble organic molecules into small soluble higher fatty acids (such as alcohols, aldehydes, ketones). This process consumes a lot of dissolved oxygen, thereby reducing the dissolved oxygen concentration of the sewage, so that the sewage enters between the partition 55 and the second fixed net 48 after deoxygenation; Step 3: Wastewater enters the interior of the sulfur-iron coupling layer 47 evenly through the second fixed net 48. Sulfate-autotrophic denitrifying bacteria denitrify and remove phosphorus from the wastewater inside the sulfur-iron coupling layer 47. During the wastewater treatment process in the sulfur-iron coupling layer 47, the reciprocating screw 43 rotates. Utilizing the principle of screw transmission, the reciprocating screw 43 drives the slide bar 42 and the second fixed net 48 to move back and forth continuously within the housing 1, with a relatively small movement distance. As the second fixed net 48 operates, it pushes the sulfur-iron coupling layer 47 to move slowly back and forth on the surface of the first fixed net 44. When the sulfur-iron coupling layer 47 comes into contact with the slider 45, the slider 45 squeezes the sulfur-iron coupling layer 47, causing the particles inside the sulfur-iron coupling layer 47 to move relative to each other, changing the position and gaps between the particles, facilitating the passage of wastewater through the gaps between the particles. With the continuous movement of the particles, impurities and sediments accumulated between the particles are eliminated. The impurities and sediments move downwards, passing through the first fixed net 44 and remaining at the bottom of the box 1. The sidewall of the slider 45 is semi-circular, which facilitates the particles to slide over the sidewall of the slider 45 and reduces the movement resistance between the particles. During the back-and-forth movement of the sulfur-iron coupling layer 47, the particles squeeze the water inside the sulfur-iron coupling layer 47, pushing the sewage to move inside the sulfur-iron coupling layer 47, so that the sewage continuously contacts the particles, accelerating the sewage treatment efficiency. The continuous movement of the particles changes the gap between the particles, making it easier for the sewage to pass through the sulfur-iron coupling layer 47. During the back-and-forth movement of the slide rod 42, the slide rod 42 drives the extrusion rod 52 to move back and forth. Multiple spheres are installed on the surface of the extrusion rod 52 to increase the contact area between the extrusion rod 52 and the fine sand. During the back-and-forth movement of the extrusion rod 52, the spacing between the fine sand particles is changed, reducing the probability of impurities in the sewage clogging the gap between the fine sand particles, making it easier for the sewage to pass through the fine sand and accelerating the sewage treatment efficiency. Step 4: The treated wastewater inside the tank 1 enters the interior of the fixed shell 23 through the connecting pipe 8. The rotating disc 28 rotates, alternately contacting the wastewater and air. After a period of rotation, a biofilm adheres to the surface of the rotating disc 28. When the rotating disc 28 and its surface biofilm enter the wastewater, the biofilm adsorbs organic pollutants and suspended solids in the wastewater and absorbs dissolved oxygen from the liquid film outside the biofilm, decomposing organic matter. Microorganisms use organic matter as nutrients to reproduce during this process. When the rotating disc 28 leaves the water surface and comes into contact with air, the liquid film attached to the outside of the biofilm absorbs oxygen from the air and transfers it to the biofilm and wastewater. The biofilm alternately contacts the wastewater and air, completing a continuous process of oxygen absorption, adsorption, oxidation, and decomposition, degrading the organic matter in the wastewater. The surface of the rotating disc 28 is provided with protrusions 510 and grooves 213, increasing the surface area of ​​the rotating disc 28, allowing for more biofilm to adhere to the rotating disc 28 while maintaining a smaller volume. The protrusions 510 are staggered, and the interior of the turntable 28 is penetrated by the groove 213, which increases the shear force of the sewage on the biofilm, allowing the aged and detached biofilm to detach smoothly under the shear force. Since the biofilm grows continuously between the turntables 28 and the turntables 28 rotate synchronously, the biofilm between adjacent turntables 28 is prone to sticking together, causing blockage inside the turntables 28. The jet pipe 29 is installed between the turntables 28. The sidewall of the jet pipe 29 is wavy, so that the rotating protrusions 510 are staggered with the jet pipe 29. The jet pipe 29 continuously cuts the biofilm between adjacent turntables 28, preventing the biofilm between the turntables 28 from sticking together. The sidewall of the jet pipe 29 is symmetrically provided with the through holes 212. Air is sprayed onto the turntables 28 through the through holes 212. The air blows towards the turntables 28, forming convection, which improves the oxygen supply capacity to the biofilm and facilitates the biofilm's degradation of sewage. The treated sewage is discharged through the effluent pipe 22. Step 5: After a period of use, open the drain pipe 11 at the bottom of the fixed shell 23 and the box 1 to clean the sediment on the fixed shell 23 and the box 1; when it is necessary to clean the fine sand layer 51, open the drain pipe 11 on the side wall of the box 1, connect the water pump to the flushing pipe 53, the water pump draws water into the interior of the flushing pipe 53, the water pushes the sealing rod 56 to move upward in a straight line inside the fixed sleeve 57, open the flushing pipe 53, and let the water flush into the interior of the fine sand layer 51 through the flushing pipe 53; as the water moves upward inside the fine sand layer 51, it pushes the third fixed net 54 above to move upward. When the spring 510 contracts, the third fixing net 54 pushes the first compression rod 59 into the interior of the second compression rod 511, increasing the distance between the two third fixing nets 54. This facilitates the continuous turbulence of the fine sand between the third fixing nets 54, causing the water to continuously push impurities inside the fine sand upwards. The water carrying the impurities passes through the third fixing nets 54 and is discharged through the drain pipe 11. After the backflushing of the fine sand layer 51 is completed, the spring 510 extends, pushing the first compression rod 59 and the third fixing net 54 downwards, causing the third fixing net 54 to press and compact the surface of the fine sand layer 51, making it easier for the fine sand layer 51 to be reused.

[0031] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A biological rotating disc for treating aquaculture wastewater using sulfur-iron coupling technology, characterized in that, include: The container (1) has a biological rotating disc (2) installed on its surface for degrading organic pollutants in wastewater. One end of the biological rotating disc (2) is equipped with a cleaning mechanism (3) for removing a large number of particulate matter in wastewater, and one end of the cleaning mechanism (3) is equipped with a feeding mechanism (7) for conveying wastewater. One end of the box (1) is equipped with a filtration and deoxygenation mechanism (5) for cleaning solid particles in sewage. The filtration and deoxygenation mechanism (5) includes a flushing pipe (53) and a partition (55). The partition (55) is fixedly connected to the inside of the box (1). Two layers of third fixing nets (54) are provided on the side wall of the partition (55). A layer of fine sand (51) is laid between the two layers of third fixing nets (54). Multiple spherical extrusion rods (52) are installed on the sliding connection surface inside the fine sand layer (51). Multiple flushing pipes (53) are fixed to one end of the box (1). One of the third fixing nets (54) is fixedly connected to the side wall of the flushing pipe (53), and the other third fixing net (54) is slidably connected to the inside of the box (1). The box (1) is equipped with a purification mechanism (4) for nitrogen and phosphorus removal. The purification mechanism (4) includes a fixing plate (41). The fixing plate (41) is installed on two layers inside the box (1). The bottom end of the fixing plate (41) is fixedly connected to a first fixing net (44). The two ends of multiple support rods (46) are fixedly connected to the first fixing net (44) and the box (1) respectively. The side wall of the box (1) is rotatably connected to a reciprocating screw (43). The side wall of the reciprocating screw (43) is threadedly connected to a slide rod (42). The side wall of the slide rod (42) is fixedly connected to multiple second fixing rods. Fixed mesh (48); a sulfur-iron coupling layer (47) is laid between adjacent second fixed meshes (48), the second fixed mesh (48) and the sulfur-iron coupling layer (47) are slidably connected to the interior of the first fixed mesh (44) and the box (1); multiple sliders (45) with semi-circular cross sections are installed inside the first fixed mesh (44) and the box (1), and the sliders (45) are slidably connected to the sulfur-iron coupling layer (47); the side walls of the partition (55) and the fixed plate (41) are both equipped with sliding sleeves (6), and the inside of the sliding sleeves (6) is slidably connected to the extrusion rod (52) and the sliding rod (42).

2. The biological rotating disc for treating aquaculture wastewater using sulfur-iron coupling technology according to claim 1, characterized in that, The biological turntable (2) includes a fixed shell (23), which is mounted on the surface of the box (1). The cylindrical fixed shell (23) is rotatably connected to a fixed shaft (27) and a turntable (28). Multiple turntables (28) are fixedly connected to the side wall of the fixed shaft (27). Multiple protrusions (510) and grooves (213) are provided on the surface of the turntable (28). On two adjacent turntables (28), the protrusions (510) are staggered. A fan (21) is mounted on the surface of the fixed shell (23), and multiple jet pipes (29) are mounted on the surface of the fixed shell (23). The jet pipes (29) are connected to the fan (21). The jet pipes (29) with a wavy surface are located between two turntables (28), and multiple through holes (212) are symmetrically provided on the surface of the jet pipes (29).

3. The biological rotating disc for treating aquaculture wastewater using sulfur-iron coupling technology according to claim 2, characterized in that, The impurity removal mechanism (3) includes an impurity removal box (31), which is fixed to one end of the fixed shell (23), and an inlet main pipe (32) is installed on the side wall of the impurity removal box (31); the inside of the impurity removal box (31) is rotatably connected to a rotating shaft (33) and a support net (34); a plurality of support nets (34) are fixedly connected to the side wall of the rotating shaft (33), and a layer of filter gauze (35) is fitted on the surface of the support net (34); a guide rail (36) is installed obliquely on the side wall of the impurity removal box (31), and a scraper (37) with an arc-shaped side wall is fixedly connected to the side wall of the guide rail (36), and the elastic scraper (37) slides on the surface of the filter gauze (35); an elastic rod (38) with a curved surface is fixedly connected to the side wall of the guide rail (36), and one end of the elastic rod (38) abuts against the inner side wall of the scraper (37).

4. The biological rotating disc for treating aquaculture wastewater using sulfur-iron coupling technology according to claim 3, characterized in that, The feeding mechanism (7) includes a fixed box (71), inside which a first gear (72) and a second gear (73) mesh with each other are rotatably connected, and the side wall of the rotating shaft (33) is fixedly connected to the first gear (72) and the fixed shaft (27); the bottom end of the fixed box (71) is fixedly connected to the water inlet cylinder (74), inside which a turbine (75) is rotatably connected, and the center of the water inlet cylinder (74) is connected to the interior of the impurity removal box (31); the side wall of the water inlet cylinder (74) is equipped with a water outlet pipe (76), and the water outlet pipe (76) is connected to the interior of the filtration and deoxygenation mechanism (5).

5. The biological rotating disc for treating aquaculture wastewater using sulfur-iron coupling technology according to claim 4, characterized in that, One end of the fixed shell (23) is fixedly connected to a baffle (9), and a drive motor (24) is installed on the top of the baffle (9); sprockets (26) are installed on the side walls of the drive motor (24), the fixed shaft (27), and the reciprocating screw (43), and adjacent sprockets (26) are connected by a chain (25).

6. The biological rotating disc for treating aquaculture wastewater using sulfur-iron coupling technology according to claim 5, characterized in that, Inside the fixed box (71), the sprocket (26) is fixedly connected to the side wall of the second gear (73) and the turbine (75). Adjacent sprockets (26) are connected by a chain (25), and the diameter of the first gear (72) is much larger than the diameter of the second gear (73).

7. The biological rotating disc for treating aquaculture wastewater using sulfur-iron coupling technology according to claim 6, characterized in that, The baffle (9) and the side wall of the fixed plate (41) are connected by a connecting pipe (8). The side walls of the baffle (9), the fixed shell (23), and the impurity removal box (31) are all equipped with sealed bearing sleeves (77), and the inside of the sealed bearing sleeve is rotatably connected to the fixed shaft (27) and the rotating shaft (33). The side wall of the fixed shell (23) is equipped with a water outlet pipe (22). The bottom end of the fixed shell (23), the bottom end of the box (1), and one side of the box (1) are all equipped with sewage pipes (11).

8. The biological rotating disc for treating aquaculture wastewater using sulfur-iron coupling technology according to claim 1, characterized in that, The flushing tube (53) is internally fixedly connected to a sealing block (58) and a fixing sleeve (57). The fixing sleeve (57) is internally slidably connected to a sealing rod (56) with a spherical top, and the sealing rod (56) engages with the sealing block (58) which has a funnel-shaped interior.

9. The biological rotating disc for treating aquaculture wastewater using sulfur-iron coupling technology according to claim 1, characterized in that, Multiple second compression rods (511) are installed inside the box (1), and the first compression rod (59) is slidably connected inside the second compression rod (511); a spring (510) is installed inside the second compression rod (511), the bottom end of the spring (510) is fixedly connected to the first compression rod (59), and the bottom end of the first compression rod (59) is connected to the third fixing net (54).

10. The biological rotating disc for treating aquaculture wastewater using sulfur-iron coupling technology according to claim 7, characterized in that, This includes a method for treating aquaculture wastewater using a sulfur-iron coupling technology, specifically comprising the following steps: Step 1: Connect the device to an external power source and turn on the drive motor (24); the aquaculture wastewater enters the interior of the impurity removal box (31) through the main water inlet pipe (32), and the rotating filter cloth (35) cleans the impurities in the wastewater; the filtered water is continuously pushed into the interior of the box (1) by the rotating turbine (75); Step 2: When the sewage enters the interior of the tank (1), the fine sand layer (51) filters the impurities in the water. The filtered water enters the first fixed net (54). Anaerobic bacteria use the dissolved oxygen in the wastewater to hydrolyze the large insoluble organic molecules into small soluble higher fatty acids (such as alcohols, aldehydes, and ketones), consuming a large amount of dissolved oxygen in the sewage. Step 3: The deoxygenated wastewater enters the interior of the sulfur-iron coupling layer (47) and is treated for nitrogen and phosphorus removal under anaerobic conditions. During the wastewater treatment process, the second fixed net (48) pushes the sulfur-iron coupling layer (47) to move slowly back and forth on the surface of the first fixed net (44). Due to the obstruction of the slider (45), the position and gap between the particles inside the sulfur-iron coupling layer (47) are changed, so that impurities and sediments between the particles are discharged. During the back and forth movement of the sulfur-iron coupling layer (47), the wastewater is pushed to continuously contact the particles, which accelerates the wastewater treatment efficiency. During the back and forth movement of the slide bar (42), the extrusion bar (52) is pushed to move back and forth inside the fine sand layer (51), which changes the spacing between the fine sand particles, making it easier for the wastewater to penetrate the fine sand. Step 4: The treated wastewater inside the tank (1) enters the interior of the biological rotating disc (2) through the connecting pipe (8); when the rotating disc (28) and its surface biofilm are immersed in the wastewater, the biofilm adsorbs organic pollutants and suspended solids in the wastewater and absorbs dissolved oxygen from the liquid film outside the biofilm to decompose organic matter; the jet pipe (29) introduces air into the rotating disc (28) to improve the oxygen supply capacity to the biofilm, which facilitates the degradation of wastewater by the biofilm; the treated wastewater is discharged through the outlet pipe (22); Step 5: After using it for a period of time, open the drain pipe (11) at the bottom of the fixed shell (23) and the box (1), clean the sediment in the fixed shell (23) and the box (1), and then backflushing the fine sand layer (51).

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