Aquaculture blowdown device and water treatment system

Abstract

The invention relates to the technical field of aquaculture, in particular to a sewage discharging device for aquaculture and a water treatment system.The sewage discharging device for aquaculture comprises a culture pond body, a sludge discharging hopper, a sludge pump and a sewage storage pond, and a slope surface structure is arranged at the pond bottom of the culture pond body; the sludge discharging hopper is arranged at the bottom of the culture pond body, communicates with the output end of the bottom of the slope surface structure and is used for collecting solid pollutants sliding along the slope surface structure; the input end of the sludge pump is communicated with the sludge discharge hopper; the sewage storage tank is communicated with the output end of the sludge pump. The pollution discharge device for aquaculture provided by the invention can realize automatic convergence and centralized collection of solid pollutants, so that the collection efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of aquaculture technology, and in particular to a sewage discharge device and water treatment system for aquaculture. Background Technology

[0002] During aquaculture, solid pollutants such as fish excrement, uneaten feed, and shed scales accumulate at the bottom of the pond. If not removed in time, they will consume dissolved oxygen in the water, produce harmful substances such as ammonia nitrogen and hydrogen sulfide, deteriorate water quality, threaten the health of fish, and provide a breeding ground for pathogens, increasing the risk of disease.

[0003] Currently, the main methods for cleaning the bottom of the pool include manual dredging, mechanical suction, and flushing. Manual dredging is labor-intensive and disturbs the water; mechanical suction equipment is bulky, inconvenient to operate, and costly; flushing requires a complex pipeline system, resulting in huge investment and wasting water resources.

[0004] Most existing aquaculture ponds use a flat-bottom design, resulting in a dispersed distribution of solid pollutants at the bottom, lacking an effective aggregation mechanism. The flat-bottom structure causes pollutants to settle and disperse in various locations, requiring cleaning to cover the entire pond bottom, which is labor-intensive and prone to omissions. The low concentration of dispersed pollutants increases the difficulty of separation and treatment; traditional cleaning methods require treating large volumes of water containing small amounts of pollutants, wasting water resources and increasing treatment costs. Summary of the Invention

[0005] This invention provides a sewage discharge device and a water treatment system for aquaculture. The sewage discharge device for aquaculture can realize the automatic collection and centralized collection of solid pollutants, thereby improving collection efficiency and reducing costs.

[0006] In a first aspect, the present invention provides a sewage discharge device for aquaculture, comprising: an aquaculture pond having a sloping structure at the bottom; a sludge hopper disposed at the bottom of the aquaculture pond and connected to the bottom output end of the sloping structure for collecting solid pollutants sliding along the sloping structure; a sludge pump having its input end connected to the sludge hopper; and a sludge storage tank connected to the output end of the sludge pump.

[0007] In one possible implementation, the slope structure comprises four slopes sloping towards the center, with the sludge discharge hopper located at the confluence center of the four slopes.

[0008] In one possible implementation, an aeration mechanism is also included, with the aeration end of the aeration mechanism located inside the aquaculture pond to assist the flow of solid pollutants in the aquaculture pond to the sludge discharge hopper.

[0009] In one possible implementation, the aeration mechanism includes: a blower; an air supply pipe connected to the output end of the blower; and an aeration disc connected to the output end of the air supply pipe. The aeration disc is located above the sludge discharge hopper, and the air bubbles output by the aeration disc can drive the water flow above the sludge discharge hopper to form an upward flow.

[0010] In one possible implementation, the aeration mechanism further includes: an aeration pipe disposed on the slope structure and connected to an air supply pipe; and multiple jet aeration nozzles connected to the aeration pipe and spaced apart along the extension direction of the aeration pipe, wherein the jet aeration nozzles output high-speed gas to assist solid pollutants on the slope structure in sliding toward the sludge discharge hopper.

[0011] In one possible implementation, the aeration mechanism also includes a drive mechanism, the output of which is connected to the aeration pipe to drive the aeration pipe and the jet aeration nozzle to rotate.

[0012] In one possible implementation, the aeration mechanism also includes a flow regulating mechanism for separately adjusting the air intake of the aeration disc and the aeration pipe to achieve differentiated aeration control.

[0013] In one possible implementation, the system further includes: a grating plate disposed at the top opening of the sludge discharge hopper; a support frame disposed on the grating plate; and a diaphragm plate connected to the top of the support frame for isolating the aeration disc and the sludge discharge hopper; wherein the aeration disc is mounted on the top of the diaphragm plate.

[0014] Secondly, the present invention provides a water treatment system for aquaculture, comprising: the aforementioned sewage discharge device; a water treatment device, wherein the inlet end of the water treatment device is connected to the upper space of the sludge discharge hopper, and the outlet end of the water treatment device is connected to the aquaculture pond.

[0015] In one possible implementation, the water treatment device includes a filter tank, a biological filter tank, and a disinfection tank arranged in sequence. The filter tank is connected to a sludge discharge hopper via a connecting pipe, which is inclined and whose lowest point is connected to a sludge storage tank. The bottom of the biological filter tank is connected to the connecting pipe.

[0016] In one possible implementation, the outlet of the water treatment device is located around the inside of the aquaculture tank to create a downward water flow around the tank.

[0017] The aquaculture wastewater discharge device provided by this invention designs the bottom of the aquaculture pond as a sloping structure, transforming the originally flat bottom into an inclined surface. Solid pollutants, under the influence of gravity, experience a downward force along the slope. When this force exceeds the frictional resistance between the pollutants and the slope, the pollutants begin to slide down the slope. Various solid pollutants, such as fish excrement, residual feed, and shed scales, converge from different locations on the pond bottom towards the lowest point of the slope, ultimately concentrating in a sludge discharge hopper located at the bottom of the slope. A sludge pump periodically extracts the high-concentration sludge from the sludge discharge hopper and transports it to a storage tank, completing the entire process of pollutant treatment from generation to collection and storage. The sloping structure utilizes gravitational potential energy to achieve passive collection of waste. The sludge discharge hopper and sludge pump constitute a mechanized collection system, and their combination forms a complete automated wastewater treatment solution. This transforms the original cleaning operation, which required full pond coverage, into single-point centralized collection, significantly reducing the cleaning area and labor input. The wastewater collection process is continuous and requires no external intervention, avoiding the periodic disturbance to the aquaculture environment caused by traditional cleaning methods. The high-concentration sludge formed in the sludge discharge hopper facilitates subsequent treatment, enables automatic aggregation and centralized collection of solid pollutants, improves collection efficiency, and reduces costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a sewage discharge device for aquaculture provided by the present invention.

[0020] Figure 2 This is a top view structural diagram of an aquaculture pond provided by the present invention.

[0021] Figure 3 This is a cross-sectional structural diagram of an aquaculture pond provided by the present invention.

[0022] Figure 4 This is a schematic diagram of a water treatment system for aquaculture provided by the present invention.

[0023] Figure 5 This is a schematic diagram of the planar structure of sludge orientation within an aquaculture area provided by the present invention.

[0024] Figure 6 This is a schematic diagram of the structure of an aeration mechanism in an aquaculture area provided by the present invention.

[0025] Figure label: 1. Aquaculture pond body; 11. Slope structure; 2. Sludge discharge hopper; 3. Sludge pump; 4. Sludge storage tank; 5. Aeration mechanism; 51. Blower; 52. Air supply duct; 53. Aeration disc; 54. Aeration pipe; 55. Jet aerator; 56. Flow regulation mechanism; 6. Grating; 7. Support frame; 8. Cross diaphragm; 9. Water treatment equipment; 91. Filtration tank; 92. Biological filter; 93. Disinfection tank; 94. Connecting pipes. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0027] The following is combined Figure 1-6 The present invention describes a wastewater discharge device for aquaculture, comprising: an aquaculture pond 1, a sludge discharge hopper 2, a sludge pump 3, and a wastewater storage tank 4, wherein: The bottom of the aquaculture pond 1 is provided with a sloping structure 11.

[0028] The sludge discharge hopper 2 is located at the bottom of the aquaculture pond 1 and is connected to the bottom output end of the slope structure 11 to collect solid pollutants that slide along the slope structure 11.

[0029] The input end of sludge pump 3 is connected to sludge discharge hopper 2.

[0030] The sludge storage tank 4 is connected to the output end of the sludge pump 3.

[0031] In this invention, by setting the bottom of the aquaculture pond 1 as a sloping structure 11, the originally flat bottom surface becomes an inclined surface. Solid pollutants, under the action of gravity, acquire a downward component force along the slope. When this component force is greater than the frictional resistance between the pollutants and the slope, the pollutants begin to slide along the slope. Various solid pollutants, such as fish excrement, residual feed, and shed scales, converge from different positions on the bottom of the pond to the lowest point of the slope, eventually concentrating in the sludge discharge hopper 2 located at the bottom of the slope. The sludge pump 3 periodically extracts the high-concentration sludge from the sludge discharge hopper 2 and transports it to the sludge storage tank 4 for storage, completing the entire process of pollutant treatment from generation to collection to storage. The sloping structure 11 utilizes gravitational potential energy to achieve passive aggregation of pollutants. The sludge discharge hopper 2 and the sludge pump 3 constitute a mechanized collection system, and the combination of the two forms a complete automated pollutant treatment solution. The cleaning operation that originally required full pond coverage is transformed into single-point centralized collection, significantly reducing the cleaning area and labor input. The pollutant aggregation process is continuous and requires no external intervention, avoiding the periodic disturbance to the aquaculture environment caused by traditional cleaning methods. The high-concentration sludge formed in the sludge discharge hopper 2 is easy to process in subsequent treatment, and can realize the automatic aggregation and centralized collection of solid pollutants, improve collection efficiency and reduce costs.

[0032] Specifically, the slope structure 11 alters the geometry of the pond bottom, providing a convergence path for pollutants that were originally scattered throughout the flat-bottomed pond. Solid pollutants include fish excrement, uneaten food, shed scales, etc., which are generally denser than water and can continuously move along the slope under the influence of gravity. The sludge discharge hopper 2 is located at the lowest point of the slope structure 11, utilizing the gravitational potential energy difference to achieve passive aggregation of pollutants. The sludge pump 3 uses negative pressure suction to pump the sludge mixture in the sludge discharge hopper 2 to the sludge storage tank 4, completing the transfer and storage of pollutants.

[0033] In related technologies, waste removal in flat-bottomed aquaculture ponds mainly relies on manual dredging or the use of vacuum trucks to remove bottom sediment, which is time-consuming and labor-intensive. Cleaning operations require partial drainage or cessation of feeding, disrupting normal aquaculture production, and the cleaning process also stirs up the bottom sediment, making the water turbid. In this embodiment of the invention, the slope structure 11, combined with the sludge discharge hopper 2 and sludge pump 3, forms an automatic waste removal system. The waste collection process is continuous and does not require interruption of normal production. The gravity-driven collection method avoids mechanical agitation that disturbs the water and fish, significantly improving waste removal efficiency and the stability of the aquaculture environment.

[0034] The sludge discharge hopper 2 is a rectangular trough structure located at the bottom of the aquaculture tank 1. Water-based epoxy coating is applied to the inner surfaces of both the aquaculture tank 1 and the sludge discharge hopper 2 to enhance seepage prevention. The sludge pump 3 can be directly installed inside the sludge discharge hopper 2 to pump the sludge deposited therein; alternatively, it can be connected to the sludge discharge hopper 2 via a pipeline.

[0035] In some embodiments, the slope structure 11 includes four slopes sloping toward the center, with the sludge discharge hopper 2 located at the confluence center of the four slopes.

[0036] In this invention, the slope structure 11 includes four slopes sloping towards the center, with inclination angles ranging from 5° to 15°. A sludge discharge hopper 2 is positioned at the convergence center of the four slopes. The four-slope structure 11 symmetrically divides the pool bottom space according to its geometric center. Each slope is responsible for collecting waste from one-quarter of the area. Waste slides along the shortest path on its respective slope towards the center, where it is uniformly collected by the sludge discharge hopper 2 at the geometric center. The inclination angle needs to balance the driving force of waste sliding with water resistance. An angle range of 5° to 15° ensures that the component of gravity is sufficient to overcome frictional resistance while avoiding excessively steep slopes that could affect the normal swimming of fish.

[0037] Specifically, the four slopes are arranged symmetrically, with the intersections of adjacent slopes forming a cross-shaped watershed. Waste from each slope moves along the gravity gradient towards the central sludge discharge hopper 2, and the four converging directions ensure that waste at any location within the pool has a clear flow direction. The tilt angle determines the magnitude of the gravitational component; a 5° angle corresponds to approximately 8.7% of gravity, and a 15° angle corresponds to approximately 25.9% of gravity, sufficient to drive the sliding of common aquaculture pollutants with a density of 1.1-1.3 g / cm³.

[0038] In this embodiment of the invention, the geometric layout of four slopes converging towards the center achieves uniform collection of sludge across the entire area, ensuring that the distance from any location to the converging center is equal and the sludge sliding time is consistent. The single-point collection method simplifies equipment configuration and reduces investment costs for sludge pumps and pipelines compared to the multi-drain sludge hopper scheme, significantly improving system reliability and maintenance convenience.

[0039] In some embodiments, an aeration mechanism 5 is also included, the aeration end of which is located inside the aquaculture pond 1, to assist the flow of solid pollutants in the aquaculture pond 1 to the sludge discharge hopper 2.

[0040] In this invention, an aeration mechanism 5 is installed inside the aquaculture pond 1, which includes an aeration end. The aeration end releases compressed gas to form bubbles in the water. As these bubbles rise under buoyancy, they exchange momentum with the surrounding water, causing the water to flow upwards and forming an upwelling. After reaching the water surface, the upwelling diffuses outwards, sinks along the pond wall, and flows towards the center at the bottom of the pond, forming a circulating flow pattern. This circulating flow provides additional thrust for gravity-driven waste sliding, accelerating the convergence of solid pollutants towards the sludge discharge hopper 2, and has a significant pushing effect, especially on pollutants with strong adhesion or a density close to that of the water body.

[0041] In this embodiment of the invention, the water circulation generated by the aeration mechanism 5 provides active propulsion for various pollutants, solving the problem of difficulty in collecting lightweight and adhesive pollutants. The aeration process simultaneously achieves the dual functions of oxygenation and flow assistance, avoiding the wear and tear and malfunction risks of mechanical equipment in water compared to a purely mechanical pushing method.

[0042] In some embodiments, the aeration mechanism 5 includes: a blower 51; an air supply pipe 52 connected to the output end of the blower 51; and an aeration disc 53 connected to the output end of the air supply pipe 52. The aeration disc 53 is located above the sludge discharge hopper 2, and the bubbles output by the aeration disc 53 can drive the upper part of the sludge discharge hopper 2 to form an upward water flow.

[0043] In this invention, the aeration mechanism 5 includes a blower 51, an air supply pipe 52, and an aeration disc 53, which is positioned above the sludge discharge hopper 2. The blower 51 provides the power source, delivering compressed air to the aeration disc 53 via the air supply pipe 52. The aeration disc 53 disperses and releases the airflow to form a uniform bubble distribution. The placement of the aeration disc 53 above the sludge discharge hopper 2 ensures that the bubble release point is located at the center of the slope convergence, where the rising airflow forms the strongest vertical flow, establishing a radial circulation flow pattern centered on the sludge discharge hopper 2. The radial flow direction is consistent with the inclination direction of the four slopes, providing a unified driving force for the sliding of sludge in all directions.

[0044] Specifically, the aeration disc 53 adopts a porous dispersion structure to disperse the airflow into fine bubbles with a diameter of 2-5 mm. The bubble release density is typically 50-100 bubbles / second·cm². The bubble cluster forms an upward flow column with a diameter of 1-2 meters above the sludge discharge hopper 2, with an upward flow velocity of 0.2-0.4 m / s, which is 5-10 times the velocity of natural convection.

[0045] In this embodiment of the invention, the pneumatic drive system consisting of the blower 51 and the aeration disc 53 avoids the operation of mechanical parts in water, resulting in high reliability and easy maintenance. The aeration disc 53 is centrally located above the sludge discharge hopper 2, ensuring the symmetry and stability of the circulating flow and providing uniform thrust support for the collection of sludge on the four slopes.

[0046] In some embodiments, the aeration mechanism 5 further includes: an aeration pipe 54 disposed on the slope structure 11, the aeration pipe 54 being connected to the air supply pipe 52; and a plurality of jet aeration nozzles 55 connected to the aeration pipe 54 and spaced apart along the extension direction of the aeration pipe 54, the jet aeration nozzles 55 outputting high-speed gas to assist solid pollutants on the slope structure 11 in sliding toward the sludge discharge hopper 2.

[0047] In this invention, the aeration mechanism 5 further includes an aeration pipe 54 disposed on the slope structure 11 and multiple jet-type aeration nozzles 55 connected to the aeration pipe 54. The aeration pipe 54 extends along the slope, providing an air supply to each jet-type aeration nozzle 55. The jet-type aeration nozzles 55 adopt a converging nozzle design, accelerating the low-speed airflow into a high-speed jet, with a jet velocity reaching 5-15 m / s. The high-speed gas jet forms a high-speed water jet in the water, generating strong shearing and impact forces, which can effectively peel off the attached pollutants on the slope and push the peeled pollutants towards the sludge discharge hopper 2.

[0048] Specifically, the aeration pipe 54, serving as the main gas distribution pipe, typically has an inner diameter of 50-100 mm and is laid obliquely along the slope. The jet aerators 55 are spaced 1-2 meters apart to ensure the jet's effective range covers the entire slope. Each jet aerator 55 has an outlet diameter of 5-10 mm, and the gas is accelerated through the converging section before being ejected at high speed. The effective range of the jet in the water is 0.5-1.0 meters, capable of covering all areas within the width of the slope.

[0049] In one specific embodiment, an aquaculture pond with an 8-meter-long slope is equipped with five jet-type aerators 55, evenly distributed at 1.6-meter intervals. The high-speed water flow shear force generated by the jet-type aerators 55 reaches 50-100 N / m², effectively stripping away a 2-5 mm thick layer of attached material, targeting biofilm and algal deposits adhering to the slope. Stubborn deposits that previously required manual cleaning with water shut off can now be completely removed by jet impact within 2 hours.

[0050] In related technologies, slope cleaning mainly relies on gravity settling and slow water flow scouring, which has limited ability to remove attached pollutants such as biofilms and algae. These attached substances gradually thicken and form an anaerobic layer, producing harmful gases such as hydrogen sulfide, affecting the aquaculture environment. Traditional cleaning methods require draining the pond water for manual scrubbing or high-pressure washing, which is complex and disruptive to production. In this embodiment of the invention, the high-speed directional water flow generated by the jet aerator 55 has a strong stripping ability, continuously removing various attached pollutants and preventing their accumulation on the slope. The jet cleaning process is carried out under normal aquaculture conditions without the need to stop production, avoiding the economic losses and environmental disturbances caused by traditional cleaning methods.

[0051] In some embodiments, the aeration mechanism 5 further includes a drive mechanism, the output end of which is connected to the aeration pipe 54 and is used to drive the aeration pipe 54 and the jet aeration nozzle 55 to rotate.

[0052] In this invention, the aeration mechanism 5 also includes a drive mechanism, the output end of which is connected to the aeration pipe 54. The drive mechanism transmits rotational power to the aeration pipe 54 via a reduction gear transmission device, causing the aeration pipe 54 and the jet-type aeration nozzles 55 mounted on it to rotate. This rotational motion transforms the originally fixed-direction jet into a scanning jet, expanding the jet's effective range from a linear strip to a fan-shaped area. The scanning angle is typically set between 60° and 120°, capable of covering most of the slope area and achieving dynamic and comprehensive cleaning.

[0053] Specifically, the drive mechanism typically uses a motor paired with a worm gear reducer, with the output speed controlled at 0.5-2 rpm to ensure sufficient contact time for the jet at each position. During rotation, the aeration pipe 54 drives multiple jet-type aeration nozzles 55 to synchronously change their spray direction, forming a fan-shaped scanning pattern. The center of rotation is usually located in the middle of the slope, and the scanning radius covers the entire width of the slope.

[0054] In this embodiment of the invention, the rotating jet system achieves full-coverage scanning and cleaning of the slope, eliminating the blind spot problem of fixed devices. The rotational motion also cleans the deposits around the jet equipment itself, preventing performance degradation due to long-term use and maintaining a continuous and stable cleaning effect.

[0055] In some embodiments, the aeration mechanism 5 further includes a flow regulating mechanism 56 for adjusting the air intake of the aeration disc 53 and the aeration pipe 54 respectively, thereby achieving differentiated aeration control.

[0056] In this invention, the aeration mechanism 5 further includes a flow regulation mechanism 56. The flow regulation mechanism 56 is used to adjust the air intake of the aeration disc 53 and the aeration pipe 54 respectively, and to control the aeration of each aeration pipe 54 in batches. The flow regulation mechanism 56 achieves independent control of the airflow in each branch through a regulating valve or flow controller, and can adjust the aeration intensity according to the distribution of dirt in different areas and cleaning needs. Batch aeration refers to starting the aeration equipment in groups according to a preset program, avoiding insufficient air source pressure and excessive energy consumption caused by starting all equipment simultaneously.

[0057] Specifically, the flow regulation mechanism 56 includes a main control valve and branch regulating valves. The main control valve regulates the total air flow, while the branch regulating valves control the flow distribution at each aeration point. The batch control program is set according to the characteristics of the waste distribution, typically starting 1-2 aeration pipes 54 on each slope at a time, with each batch running for 30-60 minutes. This ensures that each aeration point receives sufficient air volume and pressure while avoiding excessive overall system load.

[0058] In this embodiment of the invention, the flow regulation mechanism 56 achieves reasonable allocation and optimized utilization of aeration resources, and the batch control strategy ensures that each aeration point can obtain sufficient working pressure. System energy consumption is effectively controlled, and equipment utilization and cleaning effect both reach optimal levels.

[0059] In some embodiments, the device further includes: a grating plate 6 disposed at the top opening of the sludge discharge hopper 2; a support frame 7 disposed on the grating plate 6; and a transverse partition 8 connected to the top of the support frame 7 for isolating the aeration disc 53 and the sludge discharge hopper 2; wherein the aeration disc 53 is installed on the top of the transverse partition 8.

[0060] In this invention, the sludge discharge hopper 2 also includes a grid plate 6 disposed at the top opening, a support frame 7 supporting the grid plate 6, and a transverse partition 8 located below the support frame 7. The aeration disc 53 is installed on top of the transverse partition 8. The grid plate 6 adopts a grid spacing design, allowing pollutants to pass freely but preventing fish from accidentally entering the sludge discharge hopper 2, thus playing a role in biosafety protection. The support frame 7 bears the weight of the grid plate 6 and transfers it to the transverse partition 8, ensuring structural stability. The transverse partition 8 spatially separates the aeration disc 53 from the sludge discharge hopper 2, preventing the rising aeration flow from directly impacting the deposited sludge in the sludge discharge hopper 2 and avoiding secondary suspension of the collected sludge.

[0061] Specifically, the spacing of the grating bars 6 is determined based on the size of the farmed fish, typically set at 30%-50% of the fish's maximum width, effectively intercepting fish without hindering the passage of pollutants. The support frame 7 is made of stainless steel, possessing sufficient load-bearing capacity and corrosion resistance. The height of the transverse baffle 8 from the bottom of the sludge discharge hopper 2 is typically 20%-30% of the hopper 2's depth, ensuring sufficient sludge storage space while effectively blocking the direct impact of rising water flow.

[0062] In this embodiment of the invention, the grid plate 6 provides reliable biological protection, and the layered structure consisting of the support frame 7 and the transverse partitions 8 effectively isolates the aeration function from the sludge collection function. Aeration flow enhancement and sludge deposition can be coordinated, avoiding functional conflicts and significantly improving the overall system efficiency.

[0063] like Figure 4-6 As shown, the present invention provides a water treatment system for aquaculture, including: the above-mentioned sewage discharge device; a water treatment device 9, the water inlet of the water treatment device 9 being connected to the upper space of the sludge discharge hopper 2, and the water outlet of the water treatment device 9 being connected to the aquaculture pond 1.

[0064] In this invention, the sewage discharge device also includes a water treatment device 9 connected to the sludge discharge hopper 2. The inlet of the water treatment device 9 is connected to the upper space of the sludge discharge hopper 2, and the outlet is connected to the aquaculture pond 1. The water treatment device 9 draws water from the upper space of the sludge discharge hopper 2 for purification. The treated clean water is then returned to the aquaculture pond 1, forming an integrated treatment system for solid waste collection and water purification. The water in the upper space of the sludge discharge hopper 2 is affected by the aeration upflow, resulting in a moderate concentration of suspended solids, which contains the pollutants that need to be removed while avoiding the impact of high-concentration sludge at the bottom on the treatment equipment.

[0065] Specifically, the inlet point of the water treatment device 9 is located above the sludge discharge hopper 2. At this location, the suspended solids concentration in the water is typically 100-300 mg / L, suitable for the inlet requirements of most water treatment processes. The treatment device performs physical filtration and biological treatment on the water to remove pollutants such as suspended solids, organic matter, and ammonia nitrogen. After treatment, all indicators of the water meet the standards for aquaculture water, and the treated water is returned to the aquaculture pond 1 for circulation through the outlet.

[0066] In this embodiment of the invention, the integrated design of the sewage discharge device and the water treatment device 9 enables on-site treatment and recycling of aquaculture wastewater, significantly reducing dependence on external water sources and wastewater discharge. Water resource utilization efficiency and environmental protection effectiveness are both significantly improved, achieving a win-win situation for both economic and ecological benefits.

[0067] In some embodiments, the water treatment device 9 includes a filter tank 91, a biological filter tank 92, and a disinfection tank 93 arranged in sequence. The filter tank 91 is connected to the sludge discharge hopper 2 through a connecting pipe 94. The connecting pipe 94 is inclined and its lowest point is connected to the sludge storage tank 4. The bottom of the biological filter tank 92 is connected to the connecting pipe 94.

[0068] In this invention, the water treatment device 9 includes a filter tank 91, a biological filter tank 92, and a disinfection tank 93 connected in sequence. A connecting pipe 94 is inclined, with its lowest point connected to a sludge storage tank 4. The bottom of the biological filter tank 92 is connected to the connecting pipe 94. The filter tank 91 performs physical filtration to remove large suspended solids, the biological filter tank 92 utilizes microorganisms to degrade organic pollutants, and the disinfection tank 93 performs sterilization treatment to ensure safe effluent. The inclined connecting pipe 94 utilizes gravity to achieve natural sedimentation and separation of sludge. The settled sludge collected at the lowest point of the inclined pipe is discharged into the sludge storage tank 4 for centralized treatment. The bottom connection design of the biological filter tank 92 allows for timely removal of excess sludge generated during the biological treatment process.

[0069] Specifically, filter tank 91 is equipped with quartz sand or fiber filter media to remove suspended particles larger than 50 micrometers. Biological filter tank 92 employs a biofilm process, where microorganisms attach to the carrier surface to form a biofilm, biochemically degrading organic matter. Disinfection tank 93 uses ultraviolet light or ozone for sterilization to ensure that pathogen indicators meet standards. Connecting pipe 94 is designed with a slope of 2°-5°, and the water residence time in the pipe is 15-30 minutes; gravity settling can remove 80%-90% of suspended particles.

[0070] In some embodiments, the outlet of the water treatment device 9 is disposed around the inner perimeter of the aquaculture tank 1 to form a downward water flow around the aquaculture tank.

[0071] In this invention, the outlet of the water treatment device 9 is located around the inner perimeter of the aquaculture pond 1. The treated clean water enters evenly from multiple points around the pond and flows towards the bottom under gravity, forming a radial flow converging from the perimeter to the center. This radial flow, combined with the upward flow generated by the aeration disc 53 in the center of the pond, establishes a three-dimensional circulating flow pattern of "downward flow from the perimeter and upward flow from the center." The peripheral entry of the clean water ensures uniform distribution and thorough mixing of the water, while the radial flow provides a forward propulsion force for the debris on the slope.

[0072] Specifically, the outlets are evenly distributed around the perimeter of the pool, typically spaced 3-5 meters apart, ensuring that the clean water can uniformly cover the entire perimeter. After entering the pool, the clean water flows downwards driven by gravity and density difference, converging towards the center along the slope after reaching the bottom. The radial flow velocity is typically 0.08-0.15 m / s, forming a stable circulation pattern with the upward flow generated by the aeration disc 53, with a circulation cycle typically lasting 3-5 hours.

[0073] In this embodiment of the invention, the peripheral arrangement of the water outlet and the central arrangement of the aeration disc 53 form a perfect spatial match. The radial flow of clean water is consistent with the direction of dirt collection, which not only enhances the dirt collection effect but also promotes water circulation. The system has good coordination and achieves optimal overall performance, realizing the simultaneous optimization of water quality improvement and dirt removal.

[0074] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An aquaculture waste discharge apparatus, characterized by comprising: The application relates to a sewage discharging device for aquaculture, which comprises the following components: an aquaculture pool body (1), the bottom of the aquaculture pool body (1) being provided with a slope structure (11); a sludge discharge hopper (2) arranged at the bottom of the aquaculture pool body (1) and being in communication with the bottom output end of the slope structure (11) for collecting solid pollutants sliding along the slope structure (11); a sludge pump (3), the input end of the sludge pump (3) being in communication with the sludge discharge hopper (2); a sludge storage pool (4) in communication with the output end of the sludge pump (3).

2. The aquaculture waste removal apparatus of claim 1, wherein, The slope structure (11) comprises four slopes which are inclined to the center, and the sludge discharge hopper (2) is located at the center of the four slopes.

3. The aquaculture waste discharge device according to claim 1 or 2, characterized in that, The sewage discharging device further comprises an aeration mechanism (5), the aeration end of the aeration mechanism (5) being located in the aquaculture pool body (1) for assisting the solid pollutants in the aquaculture pool body (1) to flow to the sludge discharge hopper (2).

4. The aquaculture waste removal apparatus of claim 3, wherein, The aeration mechanism (5) comprises: a fan (51); an air supply pipeline (52) in communication with the output end of the fan (51); an aeration disc (53) in communication with the output end of the air supply pipeline (52), the aeration disc (53) being located above the sludge discharge hopper (2), and the bubbles output by the aeration disc (53) can form upward water flow above the sludge discharge hopper (2).

5. The aquaculture waste removal apparatus of claim 4, wherein, The aeration mechanism (5) further comprises: an aeration pipe (54) arranged on the slope structure (11), the aeration pipe (54) being in communication with the air supply pipeline (52); a plurality of jet-type aeration nozzles (55) in communication with the aeration pipe (54) and being arranged at intervals along the extension direction of the aeration pipe (54), the jet-type aeration nozzles (55) output high-speed gas for assisting the solid pollutants on the slope structure (11) to slide to the sludge discharge hopper (2).

6. The aquaculture waste removal apparatus of claim 5, wherein, The aeration mechanism (5) further comprises a driving mechanism, the output end of the driving mechanism being connected with the aeration pipe (54) for driving the aeration pipe (54) and the jet-type aeration nozzles (55) to rotate.

7. The aquaculture waste removal apparatus of claim 5, wherein, The aeration mechanism (5) further comprises a flow adjusting mechanism (56) for respectively adjusting the air intake of the aeration disc (53) and the aeration pipe (54) to realize differential aeration control.

8. The aquaculture waste removal apparatus of claim 4, wherein, The sewage discharging device further comprises: a grating plate (6) arranged at the top opening of the sludge discharge hopper (2); a support frame (7) arranged on the grating plate (6); a transverse partition plate (8) connected with the top of the support frame (7) for isolating the aeration disc (53) and the sludge discharge hopper (2); wherein the aeration disc (53) is mounted on the top of the transverse partition plate (8).

9. A water treatment system for aquaculture, characterized in that The sewage discharging device further comprises: the sewage discharging device according to any one of claims 1-8; a water treatment device (9), the water inlet end of the water treatment device (9) being in communication with the upper space of the sludge discharge hopper (2), and the water outlet end of the water treatment device (9) being in communication with the aquaculture pool body (1).

10. A water treatment system for aquaculture according to claim 9, characterised in that, The water treatment device (9) comprises a filter tank (91), a biological filter tank (92) and a disinfection tank (93) which are sequentially communicated, the filter tank (91) is communicated with the sludge hopper (2) through a communication pipeline (94), the communication pipeline (94) is inclinedly arranged, and the lowest part of the communication pipeline (94) is communicated with the sludge storage tank (4). The bottom of the biological filter tank (92) is communicated with the communication pipeline (94).

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