A source water treatment system for seawater shellfish larviculture

Abstract

The utility model relates to the field of marine economic shellfish indoor breeding and culture technology, especially to a source water treatment system for seawater shellfish breeding, which comprises outdoor seawater sedimentation tanks, valveless filter tanks, activated carbon filter tank groups, sand filter tank groups and water collecting tanks connected in sequence through pipelines, wherein the outdoor seawater sedimentation tanks are used for water storage or preliminary deposition of large-particle suspended matters in natural seawater; the valveless filter tanks are used for seawater filtration and ozone sterilization; the activated carbon filter tank groups are used for adsorbing excess ozone and residual pathogenic microorganisms in seawater; the sand filter tank groups are used for removing small-particle suspended matters in seawater; and the water collecting tanks are used for collecting seawater filtered by the sand filter tank groups, and the seawater accumulated in the water collecting tanks is used for shellfish breeding water. The utility model can effectively remove silt, organic debris, particle suspended matters and pathogenic microorganisms in natural seawater, does not affect the physicochemical properties and trace element content of seawater, and helps to improve the success rate of economic shellfish breeding.

Description

Technical Field

[0001] This utility model relates to the field of indoor breeding and aquaculture technology for marine economic shellfish, and in particular to a source water treatment system for marine shellfish seedling cultivation. Background Technology

[0002] In recent years, the global shellfish aquaculture industry has continued to expand. As a major producer and consumer of shellfish, my country's stability in the shellfish seedling stage directly impacts the security of the supply chain. However, the deterioration of the nearshore marine environment is becoming a core bottleneck restricting the development of the shellfish seedling industry. The continuous and large-scale discharge of industrial, agricultural, and domestic wastewater into the sea, along with pollution caused by large-scale, high-density aquaculture, has exacerbated eutrophication in nearshore seawater, leading to frequent heavy metal contamination, and the proliferation of red tides, algae, and pathogenic microorganisms, creating a crisis of water safety for shellfish seedling cultivation.

[0003] From an industry practice perspective, most shellfish hatcheries currently employ the traditional source water treatment model of "simple sedimentation and single sand filtration" during the hatching period to reduce production costs. This model can only remove some large particles of sediment from seawater and cannot effectively intercept dissolved pollutants, pathogenic microorganisms, and red tide algae cells. Especially during sensitive periods in marine environments (such as when seawater temperatures rise to 18-25℃ in late spring and early summer), red tide algae and pathogenic microorganisms enter their outbreak phase, further amplifying the limitations of traditional treatment processes. As a result, the number of shellfish hatching failures due to substandard hatching water is increasing in my country every year. For example, in Yantai City, Shandong Province, there are hundreds of shellfish hatcheries, and the hatching failure rate for mainstream species such as blood clams and cockles has exceeded 60% in the past five years. Authoritative third-party testing data shows that the number of red tide algae and pathogenic microorganisms in the seawater in the inlet pipes and cultivation tanks of shellfish hatchery workshops seriously exceeds the standards.

[0004] Even more serious is the lack of systematic design in the existing shellfish seedling water treatment system: on the one hand, it does not build a complete treatment chain for "sterilization-detoxification-deep filtration", such as traditional sand filtration cannot remove dissolved algal toxins; on the other hand, the treatment system has shortcomings, such as traditional sand filter ponds mostly using cement purlins as baffles, which need to be dismantled and cleaned with a crane every year. If the purlins break, the sand filter layer needs to be emptied and replaced, which is not only time-consuming and labor-intensive (each maintenance takes 3-5 days), but also easily leads to the interruption of the seedling water supply.

[0005] Given the reality that the nearshore marine environment is unlikely to improve fundamentally in the short term, the quality of water treatment at the source for shellfish seedling cultivation has become a key variable determining the success or failure of shellfish seedling cultivation. Therefore, the development of an effective raw water treatment system for shellfish seedling cultivation is urgently needed to address the current predicament of the shellfish seedling cultivation industry and to improve the success rate and stability of shellfish seedling cultivation. Summary of the Invention

[0006] To address the aforementioned problems, the purpose of this utility model is to provide a source water treatment system for marine shellfish seedling cultivation, thereby solving the problems of poor water quality and low seedling success rate in existing shellfish seedling cultivation systems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a source water treatment system for marine shellfish breeding, including an outdoor seawater sedimentation tank, a valveless filter tank, an activated carbon filter group, a sand filter group, and a collection tank connected in sequence by pipelines. The outdoor seawater sedimentation tank is used for the preliminary sedimentation of large particulate suspended matter in stored water or natural seawater; the valveless filter tank is used for seawater filtration and ozone sterilization; the activated carbon filter group is used to adsorb excess ozone and residual pathogenic microorganisms in seawater; the sand filter group is used to remove small particulate suspended matter in seawater; and the collection tank is used to collect the seawater filtered by the sand filter group. The seawater accumulated in the collection tank is used for shellfish breeding and cultivation.

[0008] The aforementioned marine shellfish seedling water treatment system also includes an equipment room and an ozone sterilization device installed in the equipment room, with the valveless filter tank installed on the top of the equipment room; The ozone sterilization device includes an oxygen generator, an ozone generator, a high-pressure jet pump, and an oxidation-reduction potential (ORP) monitoring device. The oxygen generator produces O2, and the ozone generator is connected to the oxygen generator. The O2 produced by the oxygen generator enters the ozone generator, which produces O3. The O3 is pumped into the valveless filter tank by the high-pressure jet pump to disinfect the seawater. The ORP monitoring device monitors the ORP of the seawater in the valveless filter tank and the activated carbon filter tank in real time.

[0009] The valveless filter canister is a cylindrical structure made of fiberglass, and the interior of the valveless filter canister is lined with multiple layers of quartz sand with progressively smaller particle sizes from bottom to top.

[0010] The valveless filter tank has a bottom layer of 30 cm thick quartz sand with a particle size of 2.0-2.5 mm, a middle layer of 20 cm thick quartz sand with a particle size of 1.0-1.5 mm, and a top layer of 3 cm thick quartz sand with a particle size of about 0.5 mm.

[0011] The activated carbon filter pool group includes multiple activated carbon filter units arranged in parallel. The activated carbon filtration unit includes an activated carbon filtration tank and a pre-stage water storage tank, which are separated by a middle partition and arranged vertically. The pre-stage water storage tank is connected to the valveless filter tank through an activated carbon filter inlet pipe. Multiple conical pipes for connecting the activated carbon filtration tank and the pre-stage water storage tank are arranged inside the middle partition. A nylon mesh and an activated carbon layer are laid on the middle partition. The nylon mesh prevents activated carbon from falling into the conical pipes. An activated carbon filter outlet pipe is provided at the top of the activated carbon filtration tank.

[0012] The sand filter group includes multiple sand filter units arranged in parallel; The sand filtration unit includes a sand filter tank and a downstream water storage tank separated by a middle partition. The middle partition is equipped with multiple conical pipes for connecting the sand filter tank and the downstream water storage tank. The middle partition is covered with nylon mesh and sand. The nylon mesh is used to prevent sand from falling into the conical pipes. The downstream water storage tank is connected to the collection tank via a water outlet pipe.

[0013] The top of the sand filter unit is equipped with a sand filter water distribution pipe, which is connected to the activated carbon filter group. The two adjacent sand filter tanks are connected by a connecting pipe.

[0014] Both the downstream water storage tank and the water collection tank are equipped with sewage pipes at their bottoms.

[0015] The outdoor seawater sedimentation tank is rectangular, 5-6 meters deep, and the bottom is lined with a geomembrane for waterproofing. The pond has a slope of 35-40°, and the surrounding area is protected by a geomembrane. The edges of the pond are hardened with concrete.

[0016] The advantages and beneficial effects of this utility model are: the source water treatment system for marine shellfish seedling cultivation provided by this utility model can effectively remove mud, organic debris, particulate matter and pathogenic microorganisms from natural seawater without affecting the physicochemical properties and trace element content of seawater, which helps to improve the success rate of economic shellfish seedling cultivation.

[0017] This invention introduces an ozone sterilization device and an activated carbon filter. Ozone enters the valveless filter tank through a jet-suction principle to sterilize and disinfect seawater. The activated carbon filter effectively adsorbs excess ozone and residual pathogens, removing almost all pathogens from seawater and significantly improving the quality of water used for shellfish breeding. Traditional sand filters typically use cement purlins as partitions, which must be removed annually (by crane) for cleaning and disinfection. If a partition breaks, the entire sand filter layer must be removed and replaced with a new purlin, resulting in a short service life and high labor input. This invention utilizes a robust partition structure made of reinforced concrete with pre-embedded ABS tapered tubes, offering a long service life, large filter area, uniform pore size, and uniform filtration speed. Cleaning and disinfection can be performed directly without removing the partitions, saving labor.

[0018] In this invention, the valveless filter tank, activated carbon filter pool, and sand filter pool are all equipped with manhole covers, and the inlet, outlet, and drainage pipes are all equipped with switches, which facilitates staff to enter and exit for inspection, independent cleaning and disinfection, and significantly improves operability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a source water treatment system for marine shellfish seedling cultivation according to this utility model; Figure 2 for Figure 1 Top view; Figure 3 for Figure 2 CC section view; Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle; Figure 5 for Figure 2 DD sectional view.

[0020] In the diagram: 1. Valveless filter tank; 2. Equipment room; 3. Staircase; 4. Activated carbon filter inlet pipe; 5. Activated carbon filter tank; 6. Activated carbon; 7. Pre-stage water storage tank; 8. Activated carbon filter outlet pipe; 9. Water collection tank inlet pipe; 10. Pre-stage water storage tank drain pipe; 11. Water collection tank outlet pipe; 12. Sand filter tank; 13. Exhaust pipe; 14. Sand filter layer; 15. Post-stage water storage tank; 16. Water storage tank outlet pipe; 17. Drainage pipe; 18. Walking platform; 19. Overflow pipe; 20. Sand filter tank water distribution pipe; 21. Conical pipe; 22. Drainage pipe gallery; 23. Connecting pipe; 24. Manhole cover; 25. Water collection tank. Detailed Implementation

[0021] The following examples further illustrate the specific embodiments of this utility model. It should be noted that the specific embodiments described herein are only for illustration and explanation of this utility model and are not limited to this utility model.

[0022] See Figures 1 to 5 As shown, this utility model provides a source water treatment system for marine shellfish breeding, including an outdoor seawater sedimentation tank, a valveless filter tank 1, an activated carbon filter group, a sand filter group, and a collection tank 25 connected in sequence by pipelines. The outdoor seawater sedimentation tank is used for the preliminary sedimentation of large particulate suspended matter in stored water or natural seawater; the valveless filter tank 1 is used for seawater filtration and ozone sterilization; the activated carbon filter group is used to adsorb excess ozone and residual pathogenic microorganisms in seawater; the sand filter group is used to remove small particulate suspended matter in seawater; and the collection tank 25 is used to collect the seawater filtered by the sand filter group. The seawater accumulated in the collection tank 25 is used for shellfish breeding and cultivation.

[0023] Furthermore, the source water treatment system for marine shellfish breeding also includes equipment room 2 and an ozone sterilization device installed in equipment room 2. A valveless filter tank 1 is installed on top of equipment room 2. (See [reference]). Figure 1As shown, the ozone sterilization device is mainly used for the elimination of pathogenic microorganisms in seawater. The ozone sterilization device includes an oxygen generator, an ozone generator, a high-pressure jet pump, and an oxidation-reduction potential (ORP) monitoring device. The oxygen generator produces O2, and the ozone generator is connected to it. The O2 produced by the oxygen generator enters the ozone generator, which produces O3. The O3 is pumped into the valveless filter tank 1 via the high-pressure jet pump (or using a centrifugal fan and jet pipe) to disinfect the seawater. The ORP monitoring device monitors the ORP of the seawater in the valveless filter tank 1 and the activated carbon filter in real time. The suitable range for ORP is 350-400mV. If the ORP exceeds the threshold, it can be fed back to the control system to automatically adjust the input of O3.

[0024] In this embodiment of the invention, the valveless filter tank 1 is mainly used to remove suspended particles such as silt, organic debris, and plankton from seawater. The valveless filter tank 1 is a cylindrical structure made of fiberglass. Inside the valveless filter tank 1, multiple layers of quartz sand with progressively smaller particle sizes are laid from bottom to top. Specifically, the bottom layer of the valveless filter tank 1 is laid with 30 cm thick quartz sand with a particle size of 2.0-2.5 mm, the middle layer is laid with 20 cm thick quartz sand with a particle size of 1.0-1.5 mm, and the top layer is laid with 3 cm thick quartz sand with a particle size of approximately 0.5 mm. The valveless filter tank 1 does not use valves for water inlet, outlet, flushing, or drainage. Stable filtration is achieved using the gravity of the water body itself. Backwashing is performed periodically using the siphon principle. Furthermore, the valveless filter tank 1 does not require manual operation during operation, effectively reducing the labor intensity of workers.

[0025] See Figures 1 to 4 As shown in the embodiment of this utility model, the activated carbon filter pool group includes multiple activated carbon filter units arranged in parallel; the activated carbon filter unit includes an activated carbon filter pool 5 and a pre-stage water storage tank 7 separated by a middle partition and arranged vertically, wherein the pre-stage water storage tank 7 is connected to the valveless filter tank 1 through an activated carbon filter inlet pipe 4, and multiple conical pipes 21 for connecting the activated carbon filter pool 5 and the pre-stage water storage tank 7 are arranged inside the middle partition, and a nylon mesh and an activated carbon layer are laid on the middle partition, the nylon mesh preventing activated carbon from falling into the conical pipes 21; an activated carbon filter outlet pipe 8 is provided at the upper part of the activated carbon filter pool 5.

[0026] Specifically, the activated carbon filter assembly is mainly used to adsorb excess O3 and residual pathogenic microorganisms. The activated carbon filter assembly is located adjacent to the valveless filter tank 1. The tank walls and bottom are constructed of reinforced concrete, with a 20 cm thick reinforced concrete partition in the middle. Embedded within this partition are 20 cm high ABS conical tubes 21, evenly distributed at 150 mm × 150 mm intervals. The conical tubes 21 feature increased pore area, uniform pore size, and consistent filtration speed. During operation, the partition does not need to be removed, facilitating cleaning and disinfection, saving labor costs. The ABS conical tubes 21 are also less prone to clogging and have a long service life. A layer of nylon mesh with a pore size of 150μm × 150μm is first laid on the middle partition of the activated carbon filter tank 5 to separate the activated carbon from the reinforced concrete partition of the pre-embedded ABS tapered pipe 21. A 1-meter-thick layer of activated carbon is laid on the middle partition. Seawater reaches the pre-stage storage tank 7 through the pipeline and then backwashes from bottom to top through the activated carbon layer. In this way, the seawater can fully contact the activated carbon layer. The filtered seawater flows into the sand filter tank 12 by gravity. An oxidation-reduction potential monitoring probe for monitoring O3 content is installed at the outlet of the activated carbon filter tank 5 to detect whether the O3 content of the seawater exceeds the standard.

[0027] See Figure 5 As shown in the embodiment of this utility model, the sand filter group includes multiple sand filter units arranged in parallel; the sand filter unit includes a sand filter pool 12 and a downstream water storage tank 15 separated by a middle partition and arranged vertically. The middle partition is provided with multiple conical tubes 21 for connecting the sand filter pool 12 and the downstream water storage tank 15. Nylon mesh and sand are laid on the middle partition, and the nylon mesh is used to prevent sand from falling into the conical tubes 21; the downstream water storage tank 15 is connected to the water collection tank 25 through the water storage tank outlet pipe 16.

[0028] Furthermore, a sand filter unit is provided with a sand filter water distribution pipe 20 at the top, which is connected to the activated carbon filter group; two adjacent sand filters 12 are connected by a connecting pipe 23. The bottom of the downstream water storage tank 15 and the water collection tank 25 are both provided with a sewage discharge pipe 17, which is connected to the underground drainage pipe gallery 22.

[0029] Specifically, the sand filter assembly is mainly used to further remove small particulate suspended solids from seawater, making the seawater clearer. The main structure of the upper and lower sand filter 12 and the subsequent water storage tank 15 is constructed of reinforced concrete. The middle partition is directly constructed with reinforced concrete to a thickness of 20 cm, and 20 cm high ABS conical tubes 21 are pre-embedded. The conical tubes 21 are evenly distributed with a spacing of 150 mm × 150 mm. The conical tubes 21 have increased filter pore area, uniform pore size, and uniform filtration speed. During operation, the partition does not need to be removed, which facilitates cleaning and disinfection, saves labor, and the ABS material conical tubes 21 are not easily clogged and have a long service life. A layer of nylon mesh with a pore size of 150μm × 150μm is first laid on the partition plate in the middle of the sand filter tank to separate the sand from the reinforced concrete partition plate with pre-embedded ABS conical pipes 21, preventing sand from seeping in with seawater. An 80cm thick layer of sea sand with a particle size of 200-250 microns is laid on top of the nylon mesh. The sea sand is disinfected and cleaned before use. Seawater, under its own gravity, passes through the fine sand layer and the ABS conical pipes 21 into the downstream storage tank 15 below the sand filter tank 12. At this point, the seawater is clearer and suitable for shellfish seedling cultivation. The sand filter tank can be divided into multiple independent units according to the water consumption of the shellfish seedling farm. Each unit is equipped with a manhole cover for easy access, inspection, and operation. Each sand filter unit has switches for its inlet, outlet, and drainage pipes. Each unit can be cleaned and disinfected independently, allowing for continuous use during shellfish seedling cultivation.

[0030] Specifically, outdoor seawater sedimentation tanks are mainly used for water storage and the initial sedimentation of most large suspended particles such as silt and organic debris in natural seawater. Outdoor seawater sedimentation tanks are mostly rectangular, 5-6 meters deep, with a geomembrane lining the bottom for waterproofing. This prevents seawater from seeping into the land and from altering the physicochemical properties and trace element content of the seawater through groundwater reverse osmosis. The pond slope should ideally be 35-40°, with geomembrane protection around the perimeter and concrete hardening of the edges to prevent soil from rolling down and causing turbidity. The water level should be sufficient for 5-7 days of water exchange during peak shellfish breeding season to prevent the inability to replenish seawater during periods of continuous strong winds.

[0031] Specifically, the collection tank 25 is mainly used for the collection, storage, testing, and pumping of filtered seawater into the workshop for water exchange. The collection tank 25 is located below the activated carbon filter group and is mainly constructed of reinforced concrete. Each collection tank wall is equipped with a manhole cover, which has the advantages of being sturdy, waterproof, and easy to disinfect and clean.

[0032] In this embodiment of the invention, a walking platform 18 is provided on top of the activated carbon filter group and the sand filter group, with both groups symmetrically arranged on both sides of the walking platform 18. In this embodiment, there are two activated carbon filter units, each located on one side of the walking platform 18. There are eight sand filter units, evenly distributed on both sides of the walking platform 18. A staircase 3 is provided on one side of the equipment room 2 to facilitate workers climbing to the top of the tanks for operation.

[0033] The working principle of the source water treatment system for marine shellfish seedling cultivation provided by this utility model is as follows: Natural seawater is first pumped into an outdoor seawater sedimentation tank for preliminary sedimentation, settling most of the silt and large organic debris. Then, the seawater is pumped into a valveless filter tank 1 for filtration and ozone sterilization, removing suspended particles such as silt, organic debris, and plankton. The ozone sterilization device uses an injection principle to inject O3 into the valveless filter tank 1 to sterilize and disinfect the seawater, removing more than 95% of pathogenic microorganisms. Subsequently, the seawater enters an activated carbon filter tank 5 to adsorb excess ozone and residual pathogenic microorganisms. After sterilization and disinfection, the seawater flows into a sand filter tank 12 to further remove small suspended particles, making the seawater clearer. Finally, the seawater enters a collection tank 25 for storage, testing, and later use. Seawater treated by the source water treatment system can be pumped into the shellfish nursery for water exchange. The valveless filter tank 1, activated carbon filter unit, and sand filter unit are all equipped with manhole covers, and their inlet, outlet, and drainage pipes are equipped with switches for easy access, inspection, and independent cleaning and disinfection by staff.

[0034] Example 1

[0035] Outdoor seawater sedimentation tanks are primarily used for water storage and the initial sedimentation of most large suspended particles such as silt and organic debris in natural seawater. Our partner, Shandong Haizhichun Marine Technology Development Co., Ltd., has constructed a new shellfish hatchery in Laizhou, Shandong Province. The outdoor seawater sedimentation tank is rectangular, 5 meters deep, with a water depth of 4.0-4.5 meters and a storage capacity of 35,000 cubic meters. The bottom of the tank is lined with a geomembrane for waterproofing, preventing seawater infiltration and soil contamination, and also preventing groundwater backflow from altering the physicochemical properties and trace element content of the seawater. The pond slope should ideally be 35-40°, with geomembrane protection around the perimeter and concrete hardening of the pond edges to prevent soil sludge from causing turbidity. The pond's water volume should be sufficient for 5-7 days of water exchange during peak shellfish hatching periods to prevent the inability to replenish seawater during periods of continuous strong winds.

[0036] Example 2

[0037] The main body of the valveless filter tank 1 is a cylindrical fiberglass structure. The bottom layer is laid with 30 cm thick quartz sand with a particle size of 2.0-2.5 mm, the middle layer is laid with 20 cm thick quartz sand with a particle size of 1.0-1.5 mm, and the top layer is laid with 3 cm thick quartz sand with a particle size of about 0.5 mm. The valveless filter tank 1 does not use valves for water inlet, outlet, flushing, and drainage. Stable filtration is achieved by utilizing the gravity of the water body itself. Seawater is pumped into the high-level water tank at the top of the valveless filter tank 1. An oxidation-reduction potential detection probe is installed in the high-level water tank. The seawater passes through the sand filter layer from bottom to top through a U-shaped pipe. Ozone enters and exits the valveless filter tank 1 through a white pipe for sterilization and disinfection. The filtered seawater flows into the activated carbon filter tank 5 by gravity. During operation, the valveless filter tank 1 is backwashed periodically using the siphon principle. The valveless filter tank 1 does not require manual operation during operation, effectively reducing the labor intensity of workers.

[0038] In summary, the seawater treatment system for shellfish breeding according to this invention can effectively remove silt, organic debris, suspended particulate matter, and pathogenic microorganisms from natural seawater without affecting the physicochemical properties and trace element content of the seawater, thus helping to improve the success rate of breeding economic shellfish. The partition structure, constructed with reinforced concrete and pre-embedded with ABS tapered pipes, is robust and has a long service life. It features large filter pore area, consistent pore size, and uniform filtration speed, allowing for direct cleaning and disinfection without removing the partitions, saving labor. The valveless filter tank, activated carbon filter pool, and sand filter pool are all equipped with manhole covers, and their inlet, outlet, and drainage pipes are equipped with switches, facilitating staff access for inspection and independent cleaning and disinfection, significantly improving operability.

[0039] The above description is merely an embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, extensions, etc., made within the principles and rules of this utility model are included within the scope of protection of this utility model.

Claims

1. A source water treatment system for marine shellfish seedling cultivation, characterized in that, The system includes an outdoor seawater sedimentation tank, a valveless filter tank (1), an activated carbon filter group, a sand filter group, and a collection tank (25) connected in sequence by pipelines. The outdoor seawater sedimentation tank is used for the initial sedimentation of large suspended particles in stored water or natural seawater. The valveless filter tank (1) is used for seawater filtration and ozone sterilization. The activated carbon filter group is used to adsorb excess ozone and residual pathogenic microorganisms in seawater. The sand filter group is used to remove small suspended particles in seawater. The collection tank (25) is used to collect seawater filtered by the sand filter group. The seawater accumulated in the collection tank (25) is used for shellfish seedling cultivation.

2. The source water treatment system for marine shellfish seedling cultivation according to claim 1, characterized in that, It also includes an equipment room (2) and an ozone sterilization device installed in the equipment room (2), wherein the valveless filter tank (1) is installed on the top of the equipment room (2); The ozone sterilization device includes an oxygen generator, an ozone generator, a high-pressure jet pump, and an oxidation-reduction potential monitoring device. The oxygen generator is used to generate O2, and the ozone generator is connected to the oxygen generator. The O2 produced by the oxygen generator enters the ozone generator, and the ozone generator is used to generate O3. The O3 is injected into the valveless filter tank (1) through the high-pressure jet pump to disinfect the seawater. The oxidation-reduction potential monitoring device monitors the ORP of the seawater in the valveless filter tank (1) and the activated carbon filter pool in real time.

3. The source water treatment system for marine shellfish seedling cultivation according to claim 1, characterized in that, The valveless filter tank (1) is a cylindrical structure made of fiberglass, and the valveless filter tank (1) is filled with multiple layers of quartz sand with progressively smaller particle size from bottom to top.

4. The source water treatment system for marine shellfish seedling cultivation according to claim 3, characterized in that, The valveless filter tank (1) has a bottom layer of 30 cm thick quartz sand with a particle size of 2.0-2.5 mm, a middle layer of 20 cm thick quartz sand with a particle size of 1.0-1.5 mm, and an upper layer of 3 cm thick quartz sand with a particle size of about 0.5 mm.

5. The source water treatment system for marine shellfish seedling cultivation according to claim 1, characterized in that, The activated carbon filter pool group includes multiple activated carbon filter units arranged in parallel. The activated carbon filtration unit includes an activated carbon filtration tank (5) and a pre-stage water storage tank (7) separated by a middle partition and arranged vertically. The pre-stage water storage tank (7) is connected to the valveless filter tank (1) through an activated carbon filter inlet pipe (4). Multiple conical pipes (21) for connecting the activated carbon filtration tank (5) and the pre-stage water storage tank (7) are arranged inside the middle partition. A nylon mesh and an activated carbon layer are laid on the middle partition. The nylon mesh prevents the activated carbon from falling into the conical pipes (21). An activated carbon filter outlet pipe (8) is provided at the top of the activated carbon filtration tank (5).

6. The source water treatment system for marine shellfish seedling cultivation according to claim 1, characterized in that, The sand filter group includes multiple sand filter units arranged in parallel; The sand filter unit includes a sand filter tank (12) and a downstream water storage tank (15) separated by a middle partition. The middle partition is provided with multiple conical pipes (21) for connecting the sand filter tank (12) and the downstream water storage tank (15). The middle partition is covered with nylon mesh and sand. The nylon mesh is used to prevent sand from falling into the conical pipes (21). The downstream water storage tank (15) is connected to the water collection tank (25) through the water outlet pipe (16).

7. The source water treatment system for marine shellfish seedling cultivation according to claim 6, characterized in that, The top of the sand filter unit is provided with a sand filter water distribution pipe (20), which is connected to the activated carbon filter pool group. The two adjacent sand filter tanks (12) are connected by a connecting pipe (23).

8. The source water treatment system for marine shellfish seedling cultivation according to claim 6, characterized in that, Both the downstream water storage tank (15) and the water collection tank (25) are equipped with sewage pipes (17) at their bottoms.

9. The source water treatment system for marine shellfish seedling cultivation according to claim 1, characterized in that, The outdoor seawater sedimentation tank is rectangular, 5-6 meters deep, and the bottom is lined with a geomembrane for waterproofing. The pond has a slope of 35-40°, and the surrounding area is protected by a geomembrane. The edges of the pond are hardened with concrete.

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