A biochemical treatment device for mariculture water

Abstract

The present application relates to the technical field of aquaculture facilities, and particularly relates to a biochemical treatment device for marine aquaculture water bodies, which comprises a barrel body, a filter area and a purification area are arranged in the barrel body, a filter element for filtering aquaculture tail water is arranged in the filter area, a water inlet pipe is communicated with the filter area, the water inlet pipe is located above the filter element, a partition plate is fixedly connected between the filter area and the purification area, a plurality of water outlet holes are communicated on the partition plate, and a purification assembly for purifying the aquaculture tail water is arranged in the purification area; the purification assembly comprises floating material and a compound bacterial agent, the floating material is an attachment base of the compound bacterial agent, a silk net is fixedly connected at the bottom of the purification area, an aeration pipe is arranged above the silk net, the aeration pipe is communicated with a connecting pipe, the connecting pipe penetrates through the bottom of the barrel body and extends to outside of the barrel body, and a water outlet pipe is communicated below the silk net. The present application integrates physical filtration and microbial treatment, is provided with an observation window and a stirring structure, makes internal working conditions visualized, and has small box body area and can adapt to various marine aquaculture environments.

Description

Technical Field

[0001] This invention relates to the field of aquaculture facilities technology, specifically to a biochemical treatment device for marine aquaculture water. Background Technology

[0002] The spotted wrasse is an important aquaculture species, and in recent years it has become increasingly popular with consumers, leading many farmers to switch to its cultivation. However, because spotted wrasse has high requirements for water quality, traditional farming methods necessitate frequent water changes. The wastewater discharged during the farming process contains uneaten feed, suspended particulate matter, and nitrogenous and phosphorus-containing organic pollutants. Direct discharge of this wastewater can easily cause eutrophication in surrounding waters and pollute the environment.

[0003] Currently, the main method for treating aquaculture wastewater is through biological treatment ponds, such as semi-recirculating aquaculture and sea grape ecological planting technology. Semi-recirculating aquaculture uses a biological system constructed by small fish, single-celled algae, and microorganisms in the treatment pond to decompose and purify the remaining feed and nitrogen-containing organic matter in the wastewater. Sea grape ecological planting uses the growth of sea grapes to reduce nitrogen and phosphorus elements in aquaculture wastewater, thereby purifying the wastewater quality.

[0004] However, both of these methods have limitations in practical applications. To ensure the effectiveness of wastewater treatment, the semi-recirculating aquaculture method, which uses biological systems for water treatment, requires the construction of large-scale dedicated biological treatment ponds and additional structures. While sea grape purification is eco-friendly, sea grapes tend to proliferate during the purification process, requiring regular cleaning and maintenance. If not cleaned in a timely manner, their decomposition may cause secondary pollution to the purified water. For farms with limited existing site conditions that have transitioned from other species to the cultivation of spotted snails, constraints such as site space and renovation costs make it difficult to construct large-scale treatment ponds, and existing wastewater treatment equipment is ill-suited to the actual production conditions of such farms.

[0005] Therefore, the present invention provides a biochemical treatment device for marine aquaculture water to solve the above-mentioned problems. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a biochemical treatment device for marine aquaculture water. Through an integrated design, it can achieve efficient filtration and biological purification of aquaculture wastewater within a limited space, reducing the cost of aquaculture site renovation and improving treatment efficiency.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: A biochemical treatment device for marine aquaculture water includes a barrel, a filtration zone and a purification zone are provided inside the barrel, a filter element for filtering aquaculture wastewater is provided in the filtration zone, an inlet pipe is connected to the filtration zone and the inlet pipe is located above the filter element, a partition is fixedly connected between the filtration zone and the purification zone, a plurality of water outlet holes are connected to the partition, and a purification component for purifying aquaculture wastewater is provided in the purification zone.

[0008] The purification components include a floating material and a compound microbial agent. The floating material serves as the substrate for the compound microbial agent. A silk mesh is fixedly connected to the bottom of the purification zone. An aeration pipe is installed above the silk mesh, and the aeration pipe is connected to a connecting pipe. The connecting pipe passes through the bottom of the tank and extends to the outside of the tank. A water outlet pipe located below the silk mesh is connected to the lower part of the tank.

[0009] The technical principles of the above solution are as follows:

[0010] The aquaculture wastewater enters the tank through the inlet pipe and is first pre-filtered by the filter element to remove large particles of residual feed, suspended solids, whelk feces, and other impurities. Then, the water exits through the outlet and enters the purification zone. In the purification zone, a compound bacterial agent decomposes residual nitrogenous and phosphorus-containing organic matter in the wastewater. An aeration pipe oxygenates the purification zone, providing sufficient oxygen for the compound bacterial metabolism. The purified water is then discharged through the outlet pipe below the silk screen.

[0011] The above approach has the following beneficial effects:

[0012] 1. This solution integrates physical filtration and biological purification into a single tank, using partitions to create a vertically layered layout between the filtration and purification zones, maximizing vertical space and reducing floor space requirements. Farms do not need to construct large-scale biological treatment ponds; simply placing the tank allows connection to existing wastewater discharge pipelines. This solution is suitable for farms with limited site modification options or those transitioning from other species to the cultivation of *Bambusa multiplex*, effectively reducing the cost of upgrading supporting water treatment facilities and lowering site requirements.

[0013] 2. This solution uses gravity flow self-driven filtration, which has low energy consumption. The inlet pipe is located above the filter element, and the effluent naturally passes through the filter element under gravity without the need for additional power, thus reducing the system's operating energy consumption. The filter element removes large particles of organic matter and impurities from the effluent, reducing the treatment pressure in the purification zone and improving purification efficiency.

[0014] 3. In this scheme, the floating material serves as an attachment substrate for the compound microbial agent, suspended within the purification zone. This increases the contact area between the microorganisms and the effluent. Aeration pipes are located at the bottom of the purification zone, releasing air bubbles that move upwards. This provides ample dissolved oxygen to the compound microbial agent and simultaneously causes the floating material to tumble and fluidize in the water, ensuring thorough mixing of the microbial agent, effluent, and oxygen. This enhances the degradation efficiency of nitrogenous organic matter and phosphorus-containing pollutants. The purified aquaculture effluent can be directly recycled back into the aquaculture ponds, saving a significant amount of aquaculture water. A silk mesh separates the floating material from the outlet pipe, preventing blockage and abnormal effluent flow, and further filters the purified effluent.

[0015] Furthermore, the filter element includes a filter screen and a filter media, with the filter screen detachably connected to the bottom of the water inlet pipe and the filter media detachably connected to the bottom of the filter screen.

[0016] Beneficial effects: The filter element adopts a double-layer composite structure of filter screen and filter media. The filter screen serves as the first-stage filtration layer, intercepting large particles of uneaten feed, feces, and suspended solids in the effluent. The filter media serves as the second-stage filtration layer, adsorbing and retaining fine particles. The two work together to achieve graded physical filtration of aquaculture effluent from coarse to fine, effectively reducing the solid load in the subsequent purification zone and extending the service life of the compound microbial agent.

[0017] Furthermore, control valves are connected to both the inlet and outlet pipes, and a flow meter is connected inside the inlet pipe.

[0018] Beneficial effects: By installing control valves on the inlet and outlet pipes, and a flow meter inside the inlet pipe, precise monitoring and adjustment of the inlet and outlet flow rates are achieved. Operators can flexibly adjust the inlet and outlet rates using the control valves according to the actual amount of aquaculture wastewater generated and the treatment capacity of the purification zone, ensuring that the device maintains hydraulic load balance under different operating conditions. The flow meter provides real-time feedback of inlet flow data, providing a basis for precise adjustment of the control valves and preventing overload of the inlet water from causing filtration failure or insufficient purification.

[0019] Furthermore, a water pump is connected to the end of the water inlet pipe that is furthest from the tank.

[0020] Beneficial effects: The water pump draws the wastewater from the aquaculture pond into the tank, eliminating the limitations of gravity flow. Furthermore, the water pump, in conjunction with a flow meter and control valve, can achieve constant flow or variable frequency pumping, ensuring a continuous and stable inflow to the filtration zone.

[0021] Furthermore, a blower is connected to the end of the connecting pipe that is away from the aeration pipe.

[0022] Beneficial effects: It provides a sufficient and controllable source of dissolved oxygen for the purification zone. The blower can generate a continuous and stable airflow, which is released into microbubbles through the aeration pipe and evenly distributed in the water of the purification zone, effectively increasing the dissolved oxygen content of the water and creating an ideal environment for the metabolic activities of aerobic compound bacterial agents, thus accelerating the oxidative decomposition of nitrogen-containing organic matter.

[0023] Furthermore, a top cover is detachably connected to the top of the barrel, a fluorescent lamp is fixedly connected to the inner wall of the top cover, and a heating element is detachably connected to the inside of the barrel.

[0024] Beneficial effects: Fluorescent lamps provide a controllable lighting environment for the purification zone, which is conducive to the photosynthetic metabolism of the compound microbial agent and promotes its absorption and utilization of phosphorus-containing pollutants and small-molecule organic acids. At the same time, suitable lighting conditions can inhibit the excessive reproduction of harmful anaerobic bacteria, improve the micro-ecological environment of the purification zone, and thus improve the overall wastewater purification efficiency. The heating tube can be used to heat the aquaculture wastewater at low temperatures, keeping the temperature of the aquaculture wastewater within the active temperature range of the compound microbial agent.

[0025] Furthermore, several transparent observation windows are provided on the side walls and top cover of the barrel.

[0026] Beneficial effects: It provides maintenance personnel with comprehensive visual monitoring conditions. Through the side wall observation window, they can view the fluidization movement of floating material in the purification area, the growth of biofilm on the surface of floating material, and the changes in water turbidity in real time. Through the top cover observation window, they can observe the working status of fluorescent lights and the liquid level.

[0027] Furthermore, a pressure relief vent is provided on the top cover.

[0028] Beneficial effects: It can release excess gas pressure generated in the tank during the aeration process in a timely manner, preventing the top cover from collapsing or the tank from deforming due to excessive gas pressure in the tank, thus ensuring the safety of the equipment during long-term operation.

[0029] Furthermore, the outside of the tank is equipped with control components for controlling the operation of the purification area. The control components include a controller and a display screen. The controller is electrically connected to the flow meter, control valve, water pump, display screen, fluorescent lamp, heating tube and blower.

[0030] Beneficial effects: The flow meter monitors the volume of tailwater pumped in. When the preset volume is reached, the controller closes the control valve on the inlet pipe and starts the blower and fluorescent lights to begin purification. After the designed purification time is reached, the blower and fluorescent lights are turned off, and the control valve on the outlet pipe is opened to release water. The display screen shows the real-time operating status of each component and key process parameters, such as instantaneous flow rate and aeration pressure, allowing operators to have a clear understanding of the equipment's operating conditions, facilitating data recording and process optimization.

[0031] Further, a plurality of fixed shafts are fixedly connected to the inner wall of the purification zone, the other end of each fixed shaft is rotatably connected with a stirring blade, and the stirring blades are located above the air outlet of the aeration pipe.

[0032] Beneficial effects: The rising bubble flow released by the aeration pipe directly impacts the blades of the stirring blades, driving the stirring blades to continuously rotate around the fixed shafts. There is no need for additional configuration of a motor or electric drive device, and the aeration airflow itself is fully utilized as the stirring power, realizing the linkage of aeration and stirring. The stirring intensity automatically changes with the aeration volume. When the pollution load of the tail water is high and the oxygen demand is large, the blower increases aeration, the stirring is synchronously enhanced, which promotes the full mixing of the floating material and the tail water. Brief Description of the Drawings

[0033] Figure 1 is a schematic diagram of the main body of the biochemical treatment device for mariculture water body according to the present invention;

[0034] Figure 2 is an isometric schematic diagram of the interior of the biochemical treatment device for mariculture water body according to the present invention;

[0035] Figure 3 is a side sectional view of the biochemical treatment device for mariculture water body according to the present invention;

[0036] Figure 4 is a top view of the biochemical treatment device for mariculture water body according to the present invention;

[0037] Figure 5 is Figure 3 an enlarged view of Part A in the drawing.

[0038] The reference numerals in the drawings of the description include: 1. Barrel body; 2. Water inlet pipe; 3. Partition plate; 4. Water outlet hole; 5. Floating material; 6. Silk screen; 7. Aeration pipe; 8. Connecting pipe; 9. Water outlet pipe; 10. Filter screen; 11. Filter material; 12. Control valve; 13. Flowmeter; 14. Water pump; 15. Blower; 16. Top cover; 17. Fluorescent lamp; 18. Observation window; 19. Pressure relief port; 20. Controller; 21. Display screen; 22. Fixed shaft; 23. Stirring blade; 101. Filtration zone; 102. Purification zone. Detailed Description of the Embodiments

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] The following detailed description illustrates the specific implementation method:

[0043] Example 1:

[0044] As attached Figure 1 and Figure 5 As shown: A biochemical treatment device for marine aquaculture water includes a tank 1, a filtration zone 101 and a purification zone 102 inside the tank 1, and a filter element for filtering aquaculture wastewater inside the filtration zone 101. The filter element includes a filter screen 10 and a filter media 11. The filter screen 10 is detachably connected to the bottom of the water inlet pipe 2, and the filter media 11 is detachably connected to the bottom of the filter screen 10.

[0045] The filtration zone 101 is connected to a water inlet pipe 2, which is located above the filter element. The end of the water inlet pipe 2 away from the tank body 1 is connected to a water pump 14. A partition 3 is fixedly connected between the filtration zone 101 and the purification zone 102. Several water outlet holes 4 are connected to the partition 3. The purification zone 102 is equipped with a purification component for purifying aquaculture wastewater.

[0046] like Figure 4 As shown, the purification component includes floating material 5 and a compound microbial agent. Floating material 5 serves as the substrate for the compound microbial agent. The compound microbial agent includes Bacillus, lactic acid bacteria, nitrifying bacteria, photosynthetic bacteria, and fecal sulfur bacteria. The functions of each microbial agent are as follows: through the biochemical action of nitrifying bacteria and photosynthetic bacteria, ammonia nitrogen in aquaculture effluent can be effectively reduced; Bacillus can decompose trace amounts of organic matter such as whelk feces in aquaculture effluent; lactic acid bacteria can lower the pH of effluent and inhibit the reproduction of harmful bacteria in effluent; and the microbial strains of the compound microbial agent can attach to the floating material 5 and reproduce.

[0047] Combination such as Figure 3 As shown, a silk net 6 is fixedly connected to the bottom of the purification zone 102. An aeration pipe 7 is provided above the silk net 6. The aeration pipe 7 is connected to a connecting pipe 8. The connecting pipe 8 passes through the bottom of the tank body 1 and extends to the outside of the tank body 1. A blower 15 is connected to the end of the connecting pipe 8 away from the aeration pipe 7. A water outlet pipe 9 located below the silk net 6 is connected to the lower part of the tank body 1 (a sealing ring is provided at the connection between the water outlet pipe 9, the water inlet pipe 2, the connecting pipe 8 and the tank body 1).

[0048] The specific implementation process is as follows: Select the corresponding tank 1 according to the water volume of the breeding pond. The volume ratio of the tank 1 to the volume of the breeding water is preferably 1:10. For example, if the area of ​​the breeding pond in the breeding farm is 30 square meters and the water depth is 20 centimeters, then the volume of the breeding water is 6 cubic meters. Therefore, the preferred capacity of the tank 1 is 0.6-0.8 cubic meters.

[0049] After selecting a suitable tank 1, place the tank 1 on one side of the breeding pond, then place the water pump 14 in the breeding pond, connect the output end of the water pump 14 to the water inlet pipe 2, connect the aeration pipe 7 and the connecting pipe 8 to the blower 15, check whether the airtightness of the connection is good, and complete the installation.

[0050] During operation, the water pump 14 and blower 15 start simultaneously. The water pump 14 draws the aquaculture wastewater from the aquaculture pond into the inlet pipe 2. The inlet pipe 2 transports the aquaculture wastewater to the top of the filtration zone 101 and out. After being filtered by the filter screen 10 and filter media 11, the aquaculture wastewater flows into the filtration zone 101. The filter screen 10 initially removes residual large-particle feed, large-particle impurities, and whelk feces from the wastewater. The filter media 11 further intercepts and adsorbs impurities in the wastewater. After physical filtration by the filter screen 10 and filter media 11, the wastewater enters the purification zone 102 from the outlet hole 4 on the partition 3.

[0051] The purification principle is to use the biochemical metabolism of the compound bacteria attached to the floating material 5 in the purification zone 102 to purify the aquaculture wastewater. When the floating material 5 changes from white to yellow and there is a bacterial film or fluffy mycelium on the floating material 5, it indicates that the bacteria have taken root on the floating material 5 and the bacteria have good activity.

[0052] Blower 15 intermittently blows oxygen into aeration pipe 7 through connecting pipe 8. Under the aeration and gravity of aeration pipe 7, floating material 5 moves up and down within purification zone 102, purifying the water. After the designed purification time is reached, control valve 12 on outlet pipe 9 opens, and purified water is discharged from outlet pipe 9.

[0053] During this process, the silk mesh 6 separates the floating material 5 from the outlet pipe 9, which can effectively prevent the floating material 5 from entering the outlet pipe 9 during the drainage process. At the same time, the silk mesh 6 can further filter the treated aquaculture wastewater and improve the clarity of the treated aquaculture water.

[0054] This solution employs a combination of physical filtration and biochemical degradation processes. First, large particulate pollutants such as solid feed residue and feces are intercepted through filter screen 10 and filter media 11. Then, the composite functional bacteria are carried by the floating material 5 for biodegradation. Compared with traditional purification methods such as using sea grapes, this solution does not require periodic treatment of excess sea grapes and other byproducts generated during the purification process. The silk mesh 6 prevents the floating material 5 from clogging the outlet pipe 9 while also performing secondary filtration of the effluent. The purification tank 1 occupies a small area and can be adapted to the environment of various aquaculture farms. The purified water can be directly recycled back into the aquaculture pond for reuse, resulting in good water-saving effects.

[0055] Example 2:

[0056] As attached Figure 1 and Figure 3 As shown, the difference from Embodiment 1 is that both the inlet pipe 2 and the outlet pipe 9 are connected to a control valve 12, and a flow meter 13 is connected inside the inlet pipe 2. A top cover 16 is detachably connected to the top of the tank body 1, and a fluorescent lamp 17 is fixedly connected to the inner wall of the top cover 16. A heating tube is detachably connected inside the tank body 1, and insulation cotton is detachably connected to the outside of the tank body.

[0057] The tank body 1 is equipped with a control component for controlling the operation of the purification zone 102. The control component includes a controller 20 and a display screen 21. The controller 20 is electrically connected to the flow meter 13, control valve 12, water pump 14, display screen 21, fluorescent lamp 17 and blower 15. The controller 20 is preferably a PLC programmable logic controller 20, which can refer to the existing Siemens PLC wastewater treatment automation monitoring system.

[0058] The specific implementation process is as follows: Flow meter 13 records the volume of aquaculture wastewater pumped into tank 1 by water pump 14. Operators can read parameters such as influent flow rate, cumulative influent volume, and equipment operating time in real time through display screen 21. Top cover 16 prevents external debris from falling into the tank 1; when the fluorescent light 17 on the inner wall of top cover 16 is turned on, it provides illumination to purification zone 102, providing light conditions for photosynthetic bacteria in the compound bacterial agent, promoting the metabolism and proliferation of photosynthetic bacteria, and further improving the ammonia nitrogen removal effect.

[0059] The controller 20 presets operating parameters such as the influent flow rate threshold, purification treatment time, and intermittent aeration cycle of the blower 15. When the tank 1 starts working, the controller 20 controls the water pump 14 to start, the control valve 12 on the influent pipe 2 to open, and the flow meter 13 collects the influent flow rate data in real time and feeds it back to the controller 20 and the display screen 21. When the flow meter 13 detects that the amount of tailwater entering the tank 1 reaches the set treatment volume, the controller 20 automatically closes the control valve 12 on the influent pipe 2, and the water pump 14 stops pumping water.

[0060] Subsequently, the controller 20 controls the blower 15 to start and stop intermittently, supplying air to the aeration pipe 7 to provide sufficient oxygen for the bacteria in the purification zone 102. Simultaneously, the fluorescent lamp 17 is turned on to provide a light source for the photosynthetic bacteria. After the preset purification time is reached, the controller 20 automatically opens the control valve 12 at the outlet pipe 9, and the purified water is discharged through the outlet pipe 9. After drainage is complete, the controller 20 closes the control valve 12 at the outlet pipe 9, and the next water treatment cycle begins.

[0061] When the ambient temperature is too low, the heating tube is activated by the controller 20 to heat the aquaculture wastewater in the tank 1, thereby enhancing the activity of the compound bacterial agent in the low-temperature environment. Insulation cotton is used to keep the water warm, reduce heat loss, and ensure the stability of the purification effect in the low-temperature environment.

[0062] Example 3:

[0063] As attached Figure 1 and Figure 3 As shown, the difference from Embodiment 2 is that, to facilitate staff observation of the purification status of the aquaculture wastewater inside the tank 1, several transparent observation windows 18 are provided on the side wall and top cover 16 of the tank 1. A pressure relief port 19 is provided on the top cover 16.

[0064] In addition, to further improve the contact between aquaculture wastewater and floating material 5 and improve water treatment efficiency, several fixed shafts 22 are welded and fixedly connected to the inner wall of the purification zone 102. The other end of each fixed shaft 22 is rotatably connected to a stirring blade 23, which is located above the air outlet of the aeration pipe 7.

[0065] The specific implementation process is as follows: The transparent observation window 18 allows staff to easily observe the clogging of the filter media 11 in the filtration zone 101, the color change of the floating material 5 in the purification zone 102, the growth status of the bacterial film, and the turbidity of the water, so as to make timely judgments on the bacterial film formation and whether the filter media 11 needs to be replaced.

[0066] The pressure relief port 19 on the top cover 16 is used to balance the air pressure inside the barrel 1. When the blower 15 aerates, the air pressure inside the barrel increases, and excess gas can be discharged through the pressure relief port 19 to avoid pressure buildup inside the barrel 1.

[0067] When the blower 15 is running, the aeration pipe 7 sprays air outward, and the airflow impacts the stirring blade 23 upward, thereby driving the stirring blade 23 to rotate around the fixed shaft 22. The rotating stirring blade 23 can agitate the water in the purification zone 102. On the one hand, it breaks up the local dead water areas and strengthens the water disturbance, so that the floating material 5 moves more fully in the purification zone 102, increases the contact area between the composite bacterial agent on the surface of the floating material 5 and the aquaculture tail water, and improves the degradation efficiency of ammonia nitrogen and organic matter. On the other hand, the stirring blade 23 can break up some of the clumps of floating material 5, prevent the floating material 5 from accumulating and agglomerating, prevent the excessive aggregation of local bacteria from affecting the overall purification effect, and thus improve the treatment efficiency.

[0068] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A biochemical treatment device for marine aquaculture water, comprising a tank (1), characterized in that, The barrel (1) is provided with a filtration zone (101) and a purification zone (102). The filtration zone (101) is provided with a filter element for filtering aquaculture wastewater. The filtration zone (101) is connected to an inlet pipe (2). The inlet pipe (2) is located above the filter element. A partition (3) is fixedly connected between the filtration zone (101) and the purification zone (102). Several water outlet holes (4) are connected to the partition (3). The purification zone (102) is provided with a purification component for purifying aquaculture wastewater. The purification components include a floating material (5) and a compound microbial agent. The floating material (5) is the substrate for the compound microbial agent. A silk net (6) is fixedly connected to the bottom of the purification zone (102). An aeration pipe (7) is provided above the silk net (6). The aeration pipe (7) is connected to a connecting pipe (8). The connecting pipe (8) passes through the bottom of the tank (1) and extends to the outside of the tank (1). The lower part of the tank (1) is connected to a water outlet pipe (9) located below the silk net (6).

2. The biochemical treatment device for marine aquaculture water according to claim 1, characterized in that, The filter element includes a filter screen (10) and a filter media (11). The filter screen (10) is detachably connected to the bottom of the water inlet pipe (2), and the filter media (11) is detachably connected to the bottom of the filter screen (10).

3. The biochemical treatment device for marine aquaculture water according to claim 2, characterized in that, Control valves (12) are connected to both the inlet pipe (2) and the outlet pipe (9), and a flow meter (13) is connected inside the inlet pipe (2).

4. The biochemical treatment device for marine aquaculture water according to claim 3, characterized in that, The end of the water inlet pipe (2) away from the tank (1) is connected to a water pump (14).

5. The biochemical treatment device for marine aquaculture water according to claim 4, characterized in that, The end of the connecting pipe (8) away from the aeration pipe (7) is connected to a blower (15).

6. The biochemical treatment device for marine aquaculture water according to claim 5, characterized in that, The top of the barrel (1) is detachably connected to a top cover (16), and a fluorescent lamp (17) is fixedly connected to the inner wall of the top cover (16). A heating tube is detachably connected inside the barrel (1).

7. The biochemical treatment device for marine aquaculture water according to claim 6, characterized in that, Several transparent observation windows (18) are provided on the side wall and top cover (16) of the barrel body (1).

8. The biochemical treatment device for marine aquaculture water according to claim 7, characterized in that, The top cover (16) is provided with a pressure relief port (19).

9. The biochemical treatment device for marine aquaculture water according to claim 8, characterized in that, The barrel (1) is equipped with a control component for controlling the operation of the purification zone (102). The control component includes a controller (20) and a display screen (21). The controller (20) is electrically connected to the flow meter (13), control valve (12), water pump (14), display screen (21), fluorescent lamp (17), heating pipe and blower (15).

10. The biochemical treatment device for marine aquaculture water according to claim 9, characterized in that, The inner wall of the purification zone (102) is fixedly connected with several fixed shafts (22), and the other end of each fixed shaft (22) is rotatably connected with a stirring blade (23). The stirring blade (23) is located above the air outlet of the aeration pipe (7).

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