A biochemical treatment and reuse device and method for marine aquaculture wastewater

Abstract

This invention relates to the field of wastewater purification technology, and more particularly to a biochemical treatment and reuse device and method for marine aquaculture wastewater, comprising an anaerobic chamber, an anoxic chamber, an aerobic chamber, and a disinfection chamber. A settling chamber is located at the top of the anaerobic chamber. A second drain pipe is provided between the settling chamber and the anoxic chamber. A first connecting pipe is provided between the anoxic chamber and the aerobic chamber. A second connecting pipe is provided between the aerobic chamber and the disinfection chamber. Through the conveying of spiral plates, sludge is recycled, avoiding the problem of low sludge settling efficiency leading to decreased treatment efficiency. The spiral blades collect and directionally discharge sludge, enabling efficient sludge return and continuously maintaining the microbial concentration within the anaerobic chamber, thus improving the stability of organic matter degradation. The blades intercept sludge in the wastewater, and the wastewater settles after passing through the blades, allowing large sludge particles to naturally settle and separate from the wastewater, improving settling efficiency and reducing sludge discharge.

Description

Technical Field

[0001] This invention relates to the field of wastewater purification technology, and in particular to a biochemical treatment and reuse device and method for marine aquaculture wastewater. Background Technology

[0002] Existing marine aquaculture facilities effectively treat wastewater and reuse it directly in the aquaculture system, which not only significantly reduces water consumption but also effectively reduces pollutant emissions, significantly improving the environmental friendliness and economic feasibility of the aquaculture system. However, existing treatment technologies struggle to achieve efficient nitrogen and phosphorus removal and pathogen inactivation through synergistic control, and are prone to secondary pollution. Furthermore, during anaerobic wastewater treatment, the wastewater carries the sludge (the carrier of anaerobic microorganisms) within the anaerobic chamber, causing the sludge to be easily lost and resulting in suspended sludge carried in the anaerobic wastewater, affecting subsequent treatment effects. The loss of sludge also leads to a decrease in anaerobic treatment efficiency. Frequent sludge replenishment not only increases operating and treatment costs but also disrupts the stability of the anaerobic treatment system. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the background art by proposing a biochemical treatment and reuse device and method for marine aquaculture wastewater.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A biochemical treatment and reuse device for marine aquaculture wastewater includes an anaerobic chamber, an anoxic chamber, an aerobic chamber, and a disinfection chamber. A settling chamber is provided at the top of the anaerobic chamber. A second drain pipe is provided between the settling chamber and the anoxic chamber. A first connecting pipe is provided between the anoxic chamber and the aerobic chamber. A second connecting pipe is provided between the aerobic chamber and the disinfection chamber. An inlet pipe is fixedly connected between the bottom of the anaerobic chamber and the drain outlet of the aquaculture pond.

[0006] An anaerobic assembly is movably installed inside the anaerobic chamber. The anaerobic assembly includes a rotating shaft, a sliding cylinder, and a rotating ring. The rotating shaft is rotatably installed inside the anaerobic chamber and the settling chamber. The sliding cylinder is slidably installed inside the anaerobic chamber and is movably fitted onto the outside of the rotating shaft. The rotating ring is rotatably installed inside the anaerobic chamber, and its inner side is fixedly connected to the rotating shaft. A mudguard is fixedly installed at the bottom of the anaerobic chamber, and a support cylinder is integrally formed on the top of the mudguard. The rotating shaft is rotatably installed inside the support cylinder.

[0007] Preferably, a connecting pipe three is fixedly fitted on the outer side of the rotating shaft. The two ends of the connecting pipe three are located inside the static chamber and the anaerobic chamber, respectively. Several evenly distributed water inlet holes are opened on the side wall of the connecting pipe three. A flow channel hole is opened inside the rotating shaft. The water inlet holes and the flow channel hole are connected. A one-way valve one is provided inside the connecting pipe three.

[0008] Preferably, a spiral plate is welded to the side wall of the rotating shaft, the outer ring of the spiral plate is lower than the inner ring, the spiral plate is rotatably installed inside the support cylinder, and a drainage hole is opened on the side wall of the rotating shaft. The drainage hole is located between the spiral plate and the mudguard, and the drainage hole is connected to the flow channel hole.

[0009] Preferably, a conical air hood is fixedly installed inside the settling chamber, and an exhaust pipe II is fixedly installed on the top of the conical air hood. The exhaust pipe II penetrates the side wall of the settling chamber to the external air storage tank. An electric motor is fixedly installed on the top of the settling chamber, and the output shaft and the rotating shaft of the electric motor are fixedly connected. One end of the drain pipe II located inside the settling chamber is lower than the conical air hood. Both the exhaust pipe II and the drain pipe II are equipped with a metering one-way valve.

[0010] Preferably, the inner side of the slide cylinder is integrally formed with a plurality of evenly distributed blades, the blades are inclined, the top of the blades is integrally formed with a support plate, the top of the support plate is welded with a conical seat, and the conical seat is slidably installed inside the stationary cavity.

[0011] Preferably, the outer side of the conical seat is higher than the inner side, the inner side of the slide cylinder is provided with a corrugated groove, and the outer side of the rotating shaft is integrally formed with a sliding ball, which is slidably installed inside the corrugated groove.

[0012] Preferably, a second rotating ring is provided at the bottom of the first rotating ring, the diameter of the second rotating ring being smaller than that of the first rotating ring, and is rotatably mounted on the inner side of the support cylinder. A plurality of evenly distributed spiral blades are provided between the first rotating ring and the second rotating ring, and the spiral blades are located between the slide cylinder and the support cylinder.

[0013] Preferably, a water distribution ring is fixedly connected to the side wall of the water inlet pipe, the water distribution ring is located below the mud baffle, an exhaust pipe is fixedly installed on the top of the disinfection chamber, a drain pipe is fixedly installed on the bottom of the disinfection chamber, and the drain pipe is fixedly connected to the water inlet of the aquaculture pond.

[0014] A method for biochemical treatment and reuse of marine aquaculture wastewater, utilizing the aforementioned biochemical treatment and reuse device, specifically includes the following steps: S1, Anaerobic stage: After the wastewater from the aquaculture pond is discharged into the anaerobic chamber, anaerobic microorganisms (using sludge as a carrier) inside the anaerobic chamber decompose the organic matter in the wastewater into methane and carbon dioxide, significantly reducing chemical oxygen demand (COD) and biochemical oxygen demand (BOD). The anaerobic wastewater is then discharged through a connecting pipe into the settling chamber for settling; S2, Anoxic stage: After the wastewater from the settling chamber is discharged into the anoxic chamber, it is further processed by non-filled anoxic microorganisms... The oxygen chamber, combined with carbon source addition and microbubble aeration, enables denitrification of nitrates under low dissolved oxygen conditions, further removing nitrogen from the wastewater; S3, Aerobic stage: After the wastewater in the anoxic chamber is discharged into the aerobic chamber, the aerobic chamber provides sufficient oxygen to complete the aerobic degradation of remaining organic matter, nitrification of ammonia nitrogen, and adsorption of some phosphorus; S4, Disinfection stage: After the wastewater in the aerobic chamber is discharged into the disinfection chamber, the ozone contact tank inside the disinfection chamber kills residual pathogenic microorganisms, prevents infection of aquaculture organisms, ensures the biological safety of the circulating water, and meets the strict water quality requirements of marine aquaculture.

[0015] Compared with existing technologies, the beneficial effects of this invention are as follows:

[0016] 1. After the sludge falls into the support cylinder, the spiral plate drives the sludge to move towards the mud shield, so that the sludge covers the top of the mud shield again. Through the conveying of the spiral plate, the sludge can be recycled, avoiding the problem of low sludge settling efficiency and resulting in a decrease in treatment efficiency.

[0017] 2. During the process of the spiral blades agitating the wastewater, the spiral blades collect the sludge in the wastewater on the side wall of the spiral blades. Through the twisting structure of the spiral blades, the collected sludge is discharged to the top of the spiral plate, realizing efficient sludge return. This continuously maintains the concentration of microorganisms in the anaerobic chamber and improves the stability of organic matter degradation.

[0018] 3. By intercepting sludge in the wastewater with the blades and allowing the wastewater to settle after passing through the blades, large sludge particles in the wastewater naturally settle and separate from the wastewater, improving settling efficiency and reducing sludge discharge. At the same time, the rapid up-and-down shaking of the slide tube allows the wastewater to clean the sludge adhering to the blades and spiral vanes, and drives the sludge downward, accelerating the sludge return speed.

[0019] 4. During the wastewater circulation process, the upward sliding of the conical seat allows the sludge settled inside the settling chamber to flow back to the top of the baffle, further improving the sludge return efficiency, reducing siltation in the settling chamber, and further reducing the amount of sludge discharged. At the same time, after the conical seat slides downward, the wastewater flushes the sludge transported by the spiral plate through the drain hole, causing the sludge to disperse and be evenly distributed above the baffle, enhancing the contact efficiency between anaerobic microorganisms and organic matter in the wastewater, and improving the degradation effect of organic pollutants. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a cross-sectional view of the internal structure of the anaerobic chamber in this invention;

[0022] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A;

[0023] Figure 4 For the present invention Figure 2 Enlarged schematic diagram of the structure at point B;

[0024] Figure 5 This is a cross-sectional view of the anaerobic chamber in this invention;

[0025] Figure 6 This is a schematic diagram of the installation of the internal structure of the anaerobic chamber in this invention;

[0026] Figure 7 This is a schematic diagram of the rotating shaft in this invention;

[0027] Figure 8 This is a cross-sectional view of the slide tube in this invention;

[0028] Figure 9 This is a schematic diagram of the internal structure of the slide tube in this invention;

[0029] Figure 10 This is a schematic diagram of the spiral blade in this invention.

[0030] In the diagram: 1. Anaerobic chamber; 11. Anoxic chamber; 12. Aerobic chamber; 121. Connecting pipe one; 122. Connecting pipe two; 13. Disinfection chamber; 131. Exhaust pipe one; 132. Drainage pipe one; 141. Inlet pipe; 142. Exhaust pipe two; 143. Drainage pipe two; 144. Metering check valve; 145. Water distribution ring; 15. Settling chamber; 151. Conical air hood; 21. Rotating shaft; 211. Electric... 212. Spiral plate; 213. Flow channel hole; 214. Drain hole; 215. Through hole; 216. Slipper ball; 22. Mud guard; 221. Support cylinder; 23. Connecting pipe three; 231. One-way valve one; 232. Water inlet hole; 31. Slide cylinder; 311. Blade; 312. Support plate; 313. Conical seat; 314. Corrugated groove; 32. Rotary ring one; 321. Spiral blade; 322. Rotary ring two. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] Reference Figure 1 - Figure 10 As shown, a biochemical treatment and reuse device for marine aquaculture wastewater includes an anaerobic chamber 1, an anoxic chamber 11, an aerobic chamber 12, and a disinfection chamber 13. A settling chamber 15 is provided at the top of the anaerobic chamber 1. A second drain pipe 143 is provided between the settling chamber 15 and the anoxic chamber 11. A first connecting pipe 121 is provided between the anoxic chamber 11 and the aerobic chamber 12. A second connecting pipe 122 is provided between the aerobic chamber 12 and the disinfection chamber 13. An inlet pipe 141 is fixedly connected between the bottom of the anaerobic chamber 1 and the drain outlet of the aquaculture pond.

[0034] Anaerobic chamber 1 is equipped with an anaerobic assembly, which includes a rotating shaft 21, a sliding cylinder 31, and a rotating ring 32. The rotating shaft 21 is rotatably installed inside the anaerobic chamber 1 and the settling chamber 15. The sliding cylinder 31 is slidably installed inside the anaerobic chamber 1 and is movably fitted onto the outside of the rotating shaft 21. The rotating ring 32 is rotatably installed inside the anaerobic chamber 1 and is fixedly connected to the rotating shaft 21. A mudguard 22 is fixedly installed at the bottom of the anaerobic chamber 1. A support cylinder 221 is integrally formed on the top of the mudguard 22, and the rotating shaft 21 is rotatably installed inside the support cylinder 221.

[0035] like Figure 1 , Figure 4 and Figure 5 As shown, a water distribution ring 145 is fixedly connected to the side wall of the water inlet pipe 141. The water distribution ring 145 is located below the mud shield 22. An exhaust pipe 131 is fixedly installed on the top of the disinfection chamber 13. A drain pipe 132 is fixedly installed on the bottom of the disinfection chamber 13. The drain pipe 132 is fixedly connected to the water inlet of the aquaculture pond.

[0036] The two ends of connecting pipe 121 are located at the bottom of the anoxic chamber 11 and the top of the aerobic chamber 12, respectively. The two ends of connecting pipe 122 are located at the bottom of the aerobic chamber 12 and inside the disinfection chamber 13, respectively. Water pumps (not shown in the figure) are installed on the side walls of water inlet pipe 141, drain pipe 132, drain pipe 143, connecting pipe 121 and connecting pipe 122.

[0037] like Figure 2 and Figure 3 As shown, a connecting pipe 23 is fixedly fitted on the outer side of the rotating shaft 21. The two ends of the connecting pipe 23 are located inside the static chamber 15 and the anaerobic chamber 1, respectively. Several evenly distributed water inlet holes 232 are opened on the side wall of the connecting pipe 23. A flow channel hole 213 is opened inside the rotating shaft 21. The water inlet holes 232 and the flow channel hole 213 are connected. A one-way valve 231 is installed inside the connecting pipe 23.

[0038] like Figure 2 , Figure 4 and Figure 7 As shown, a spiral plate 212 is welded to the side wall of the rotating shaft 21. The outer ring of the spiral plate 212 is lower than the inner ring. The spiral plate 212 is rotatably installed inside the support cylinder 221. A drain hole 214 is provided on the side wall of the rotating shaft 21. The drain hole 214 is located between the spiral plate 212 and the mudguard 22. The drain hole 214 is connected to the flow channel hole 213.

[0039] In this process, the wastewater from the aquaculture pond is discharged into the interior of the water distribution ring 145 through the inlet pipe 141. The water distribution ring 145 evenly distributes the wastewater to the bottom of the anaerobic chamber 1, allowing the wastewater to pass evenly through the mud baffle 22 and undergo anaerobic treatment inside the anaerobic chamber 1. After anaerobic treatment, the wastewater passes through the slide 31 and enters the interior of the settling chamber 15 through the connecting pipe 23 for settling. As the wastewater continues to be discharged into the interior of the anaerobic chamber 1, the wastewater that has been settling inside the settling chamber 15 is discharged into the interior of the anoxic chamber 11 through the drain pipe 143 for anoxic treatment.

[0040] Further reference Figures 2-4 To explain, during the anaerobic treatment process, the rotating shaft 21 drives the spiral plate 212 to rotate. When the wastewater below the mud shield 22 passes through the mud shield 22, it washes the sludge (the carrier of anaerobic microorganisms) covering the mud shield 22, causing the sludge to float inside the anaerobic chamber 1 and anaerobically treat the wastewater. Over time, the floating sludge falls to the inside of the support cylinder 221. The side wall of the spiral plate 212 has several evenly distributed through holes 215. After the sludge falls to the support cylinder 221, the spiral plate 212 drives the sludge to move towards the mud shield 22, so that the sludge covers the mud shield 22 again. Through the conveying of the spiral plate 212, the sludge can be recycled, avoiding the problem of low sludge settling efficiency leading to a decrease in treatment efficiency.

[0041] After the wastewater enters the settling chamber 15, it flows into the anaerobic chamber 1 through the inlet hole 232, the flow channel hole 213, and the outlet hole 214 for anaerobic treatment again. This allows the wastewater to circulate within the system, improving treatment efficiency. Meanwhile, the outlet hole 214 is located between the spiral plate 212 and the mud baffle 22. During the wastewater circulation process, the wastewater washes away the sludge transported by the spiral plate 212 through the outlet hole 214, causing the sludge to disperse and be evenly distributed above the mud baffle 22. This enhances the contact efficiency between anaerobic microorganisms and organic matter in the wastewater, improving the degradation effect of organic pollutants.

[0042] like Figure 2 , Figure 6 and Figure 10 As shown, a second rotating ring 322 is provided at the bottom of the first rotating ring 32. The diameter of the second rotating ring 322 is smaller than that of the first rotating ring 32, and it is rotatably installed on the inner side of the support cylinder 221. Several evenly distributed spiral blades 321 are provided between the first rotating ring 32 and the second rotating ring 322. The spiral blades 321 are located between the slide cylinder 31 and the support cylinder 221.

[0043] In the anaerobic process, the rotating shaft 21 drives the rotating ring 32 to rotate, which in turn drives the spiral blades 321 and 322 to rotate. This causes the spiral blades 321 to agitate the wastewater and sludge mixture inside the anaerobic chamber 1, promoting full contact between organic matter and anaerobic microorganisms. During the agitation process, the spiral blades 321 collect sludge from the wastewater on their sidewalls. Through the twisting structure of the spiral blades 321, the collected sludge is discharged above the spiral plate 212, achieving efficient sludge return. This continuously maintains the concentration of microorganisms in the anaerobic chamber and improves the stability of organic matter degradation.

[0044] like Figure 2 , Figure 8 and Figure 9 As shown, the inner side of the slide cylinder 31 has a number of evenly distributed blades 311 integrally formed. The blades 311 are inclined. The top of the blades 311 is integrally formed with a support plate 312. The top of the support plate 312 is welded with a conical seat 313. The conical seat 313 is slidably installed inside the stationary cavity 15.

[0045] The blade 311 is tilted in the same direction as the rotation of the rotating shaft 21, and the width of the end of the blade 311 closest to the inner wall of the anaerobic chamber 1 is greater than that of the other end. This allows the sludge in the wastewater to move closer to the inner wall of the anaerobic chamber 1 due to centrifugal force during the stirring of the wastewater by the spiral blade 321. As the wastewater passes through the blade 311, the blade 311 blocks the sludge in the wastewater, causing the sludge to fall to the inner side of the rotating ring 32. The wastewater passing through the blade 311 is de-rotated by the blade 311 and the support plate 312, allowing the wastewater to remain stationary above the blade 311. Through the interception of sludge in the wastewater by the blade 311 and the stationary state of the wastewater after passing through the blade 311, large particles of sludge in the wastewater naturally settle and separate from the wastewater, improving settling efficiency and reducing the amount of sludge discharged.

[0046] like Figure 2 , Figure 7 and Figure 8 As shown, a corrugated groove 314 is provided on the inner side of the slide cylinder 31, and a sliding ball 216 is integrally formed on the outer side of the rotating shaft 21. The sliding ball 216 is slidably installed inside the corrugated groove 314.

[0047] During the rotation of the rotating shaft 21, the rotating shaft 21 drives the sliding cylinder 31 to reciprocate up and down through the sliding ball 216 and the corrugated groove 314. When the sliding cylinder 31 moves upward rapidly, the blades 311 squeeze the wastewater above. At this time, the wastewater squeezes and passes through the blades 311, which cleans the sludge adhering to the blades 311 and discharges the sludge below the blades 311, further accelerating the sludge return speed. When the sliding cylinder 31 moves downward rapidly, the blades 311 release an impact water wave downward. At this time, the water wave impacts the spiral blade 321, which cleans and drives the sludge above the spiral blade 321 to move downward, thereby achieving efficient peeling and return of the sludge adhering to the surface of the spiral blade 321.

[0048] like Figure 2 , Figure 4 and Figure 10 As shown, a conical air hood 151 is fixedly installed inside the settling chamber 15. An exhaust pipe 142 is fixedly installed on the top of the conical air hood 151. The exhaust pipe 142 passes through the side wall of the settling chamber 15 to the external air storage tank. An electric motor 211 is fixedly installed on the top of the settling chamber 15. The output shaft of the electric motor 211 and the rotating shaft 21 are fixedly connected. One end of the drain pipe 143 located inside the settling chamber 15 is lower than the conical air hood 151. A metering check valve 144 is provided inside both the exhaust pipe 142 and the drain pipe 143. The outer side of the conical seat 313 is higher than the inner side.

[0049] During the up-and-down movement of the slide cylinder 31, the conical seat 313 moves rapidly up and down along with the slide cylinder 31. As the conical seat 313 slides upward, the sludge deposited on the surface of the water inlet 232 corresponds to the sludge deposited on the surface of the conical seat 313. At this time, the pressure inside the settling chamber 15 increases, causing the water inlet 232 to draw the deposited sludge into the flow channel hole 213 and discharge it through the drain hole 214 to the top of the mud baffle 22. The upward sliding of the conical seat 313 causes the sludge deposited inside the settling chamber 15 to flow back to the top of the mud baffle 22, further improving the sludge return efficiency, reducing siltation in the settling chamber, and further reducing the amount of sludge discharged.

[0050] A method for biochemical treatment and reuse of marine aquaculture wastewater, using the aforementioned biochemical treatment and reuse device, specifically includes the following steps: S1, Anaerobic stage: After the wastewater from the aquaculture pond is discharged into the anaerobic chamber 1, the anaerobic microorganisms (using sludge as a carrier) inside the anaerobic chamber 1 decompose the organic matter in the wastewater into methane and carbon dioxide, significantly reducing the chemical oxygen demand (COD) and biochemical oxygen demand (BOD). The anaerobic wastewater is then discharged into the settling chamber 15 through connecting pipe 23 for settling; S2, Anoxic stage: After the wastewater in the settling chamber 15 is discharged into the anoxic chamber 11, it passes through the unfilled anoxic chamber... 11. With the addition of carbon source and microbubble aeration, nitrate denitrification is carried out under low dissolved oxygen conditions, further removing nitrogen from the wastewater; S3. Aerobic stage: After the wastewater in the anoxic chamber 11 is discharged into the aerobic chamber 12, the aerobic degradation of the remaining organic matter and the nitrification of ammonia nitrogen, as well as the adsorption of some phosphorus, are completed by the sufficient oxygen in the aerobic chamber 12; S4. Disinfection stage: After the wastewater in the aerobic chamber 12 is discharged into the disinfection chamber 13, the ozone contact tank in the disinfection chamber 13 kills the remaining pathogenic microorganisms, prevents infection of aquaculture organisms, ensures the biological safety of the circulating water, and meets the strict water quality requirements of marine aquaculture.

[0051] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0052] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for biochemical treatment and reuse of mariculture wastewater, comprising an anaerobic chamber (1), an anoxic chamber (11), an aerobic chamber (12) and a disinfection chamber (13), characterized in that: The top of the anaerobic cavity (1) is provided with a standing cavity (15), a drain pipe two (143) is arranged between the standing cavity (15) and the anoxic cavity (11), a connecting pipe one (121) is arranged between the anoxic cavity (11) and the aerobic cavity (12), a connecting pipe two (122) is arranged between the aerobic cavity (12) and the disinfection cavity (13), and a water inlet pipe (141) is fixedly connected between the bottom of the anaerobic cavity (1) and the drain port of the breeding pool; The inside of the anaerobic cavity (1) is movably provided with an anaerobic assembly, the anaerobic assembly comprises a rotating shaft (21), a sliding cylinder (31) and a rotating ring one (32), the rotating shaft (21) is rotatably arranged in the inside of the anaerobic cavity (1) and the standing cavity (15), the sliding cylinder (31) is slidably arranged in the inside of the anaerobic cavity (1), the sliding cylinder (31) is movably sleeved on the outside of the rotating shaft (21), the rotating ring one (32) is rotatably arranged in the inside of the anaerobic cavity (1), the inside of the rotating ring one (32) is fixedly connected with the rotating shaft (21), the bottom of the anaerobic cavity (1) is fixedly provided with a mud guard (22), the top of the mud guard (22) is integrally provided with a supporting cylinder (221), and the rotating shaft (21) is rotatably arranged in the inside of the supporting cylinder (221); The outside of the rotating shaft (21) is fixedly sleeved with a connecting pipe three (23), the two ends of the connecting pipe three (23) are located in the inside of the standing cavity (15) and the anaerobic cavity (1) respectively, a plurality of water inlet holes (232) are arranged on the side wall of the connecting pipe three (23), a flow channel hole (213) is arranged in the inside of the rotating shaft (21), the water inlet holes (232) and the flow channel hole (213) are communicated, and the inside of the connecting pipe three (23) is provided with a one-way valve one (231); The side wall of the rotating shaft (21) is welded with a spiral plate (212), the outer ring of the spiral plate (212) is lower than the inner ring, the spiral plate (212) is rotatably arranged in the inside of the supporting cylinder (221), a drain hole (214) is arranged on the side wall of the rotating shaft (21), the drain hole (214) is located between the spiral plate (212) and the mud guard (22), and the drain hole (214) and the flow channel hole (213) are communicated; The inside of the sliding cylinder (31) is integrally provided with a plurality of blades (311) which are uniformly distributed, the blades (311) are inclined, the top of each blade (311) is integrally provided with a supporting plate (312), the top of the supporting plate (312) is welded with a conical seat (313), and the conical seat (313) is slidably arranged in the inside of the standing cavity (15).

2. The device for biochemical treatment and reuse of wastewater from mariculture according to claim 1, characterized in that: The inside of the standing cavity (15) is fixedly installed with a conical air cover (151), the top of the conical air cover (151) is fixedly installed with an exhaust pipe two (142), the exhaust pipe two (142) penetrates the side wall of the standing cavity (15) to the outside storage tank, the top of the standing cavity (15) is fixedly installed with an electric motor (211), the output shaft of the electric motor (211) is fixedly connected with a rotating shaft (21), one end of a second drain pipe (143) located inside the standing cavity (15) is lower than the conical air cover (151), and the inside of the exhaust pipe two (142) and the second drain pipe (143) is provided with a quantitative check valve (144).

3. The device for biochemical treatment and reuse of wastewater from mariculture according to claim 1, characterized in that: The outside of the conical seat (313) is higher than the inside, the inside of the sliding cylinder (31) is provided with a corrugated groove (314), and the outside of the rotating shaft (21) is integrally formed with a sliding ball (216), which is slidingly installed in the inside of the corrugated groove (314).

4. The device for biochemical treatment and reuse of wastewater from mariculture according to claim 3, characterized in that: The bottom of the rotating ring one (32) is provided with a rotating ring two (322), the diameter of the rotating ring two (322) is smaller than that of the rotating ring one (32), and the rotating ring two (322) is rotatably installed on the inside of the supporting cylinder (221), a plurality of spiral fins (321) are arranged between the rotating ring one (32) and the rotating ring two (322), and the spiral fins (321) are located between the sliding cylinder (31) and the supporting cylinder (221).

5. The device for biochemical treatment and reuse of wastewater from mariculture according to claim 4, characterized in that: The side wall of the water inlet pipe (141) is fixedly connected with a water distribution ring (145), the water distribution ring (145) is located below the mud guard (22), the top of the disinfection cavity (13) is fixedly installed with an exhaust pipe one (131), the bottom of the disinfection cavity (13) is fixedly installed with a first drain pipe (132), and the first drain pipe (132) is fixedly connected with the water inlet of the breeding pond.

6. A method for biochemical treatment and reuse of mariculture wastewater, characterized in that: The treatment and recycling method uses the seawater breeding wastewater biochemical treatment and recycling device of claim 5, and specifically includes the following steps: S1, anaerobic stage: after the wastewater in the breeding pond is discharged into the inside of the anaerobic cavity (1), the organic matter in the wastewater is decomposed into methane and carbon dioxide by anaerobic microorganisms in the inside of the anaerobic cavity (1), the chemical oxygen demand and the biochemical oxygen demand are significantly reduced, and the wastewater after anaerobic treatment is discharged into the inside of the standing cavity (15) through the connecting pipe three (23); S2, anoxic stage: after the wastewater in the inside of the standing cavity (15) is discharged into the inside of the anoxic cavity (11), the anoxic cavity (11) without filler is used to cooperate with carbon source addition and micro-bubble aeration, so that the nitrate is denitrified under the condition of low dissolved oxygen, and the nitrogen in the wastewater is further removed; S3, aerobic stage: after the wastewater in the inside of the anoxic cavity (11) is discharged into the inside of the aerobic cavity (12), the sufficient oxygen in the inside of the aerobic cavity (12) is used to complete the aerobic degradation of the remaining organic matter, the nitrification of ammonia nitrogen, and the adsorption of part of phosphorus; S4, disinfection stage: after the wastewater in the inside of the aerobic cavity (12) is discharged into the inside of the disinfection cavity (13), the residual pathogenic microorganisms are killed by the ozone contact tank in the inside of the disinfection cavity (13), the breeding organisms are prevented from being infected, the biological safety of the circulating water is ensured, the strict requirements of seawater breeding on water quality are met.

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