An embedded land-based circular pond recirculating aquaculture system

Abstract

An embedded land-based circular pond circulating water aquaculture system, comprising a culture pond, a water inlet system, a tail water discharge system, a sewage discharge treatment system, and an external pond. The tail water discharge system includes a tail water discharge pipe and a drainage ditch. The inlet of the tail water discharge pipe is in the culture pond, and the drainage ditch is connected to the external pond. The sewage discharge treatment system includes a sewage discharge pipe, a sewage collection well, a solid-liquid separation tank, a manure drying pond, and a tail water processor. The tail water processor is connected to the external pond. The external pond is connected to the water inlet system. It can keep the dissolved oxygen content in the water quality of the culture pond at a dissolved oxygen concentration suitable for fish growth. By separating the discharge of sewage and tail water, and through the hydraulic centrifugal action of a quiet micro-flow state, the feces and residual baits in the water body of the culture pond are aggregated, reducing the sewage discharge volume. It can reduce the number of supporting sewage treatment system constructions, lower the construction cost and operation cost of the sewage treatment system. The treated sewage and tail water are deeply purified and then returned to the culture pond for recycling, improving the utilization rate of water resources.

Description

Technical Field

[0001] The present invention relates to an aquaculture device, in particular to a land-based aquaculture pond system. Background Art

[0002] With the rapid development of China's economy and the continuous improvement of people's living standards, fish, as a high-quality protein food, is becoming increasingly popular among people, with an increasing demand. The aquaculture of fish has developed rapidly. Although cage fish farming can greatly increase the fish yield per unit water surface, the excrement and residual bait of fish are directly discharged into the water bodies of rivers, lakes and reservoirs, causing pollution to the water bodies, and its production has been strictly restricted. Building a recirculating aquaculture pond is a major trend in aquaculture. To enable fish to grow rapidly and healthily, a good water quality environment is indispensable. To increase the yield per unit water surface, it is necessary to increase the aquaculture density. To increase the aquaculture density, it is first necessary to ensure that there is sufficient dissolved oxygen in the water body. The metabolites of fish are continuously discharged into the water, which will deteriorate the water quality. If not discharged in time, it will affect the normal growth of fish and even lead to the death of fish. In the current aquaculture ponds, oxygenation is mainly achieved by arranging aeration pipes in the aquaculture ponds and aerating with a blower. The oxygen utilization rate is low, the oxygenation effect is poor, and it also stirs the water body of the aquaculture pond, causing a violent tumbling phenomenon of the boiling water culture, which is not conducive to the sedimentation of fish feces and residual bait. The current recirculating aquaculture pond sewage discharge mostly uses the gravity effect for bottom discharge, and cannot effectively discharge the feces and residual bait in the aquaculture pond. The discharge of low-pollution tail water mainly adopts methods such as bottom discharge, surface discharge, and side discharge, and cannot quickly discharge ammonia nitrogen, nitrite nitrogen, suspended solids, foam oil film, etc. in the aquaculture pond, affecting aquaculture. And in some systems, the tail water discharge and sewage discharge are carried out simultaneously. To ensure water quality, the water inflow is often increased, and usually needs to be exchanged once an hour, which requires a large supporting sewage treatment system, with high construction costs and operating costs, large water consumption, low water resource utilization rate, and poor sewage treatment effect. Summary of the Invention

[0003] The present invention aims to provide an embedded land-based circular pond recirculating aquaculture system. By increasing the dissolved oxygen concentration of the influent water, the dissolved oxygen content in the water quality of the aquaculture pond is maintained at a dissolved oxygen concentration suitable for the growth of fish. Through the method of separate discharge of sewage and tail water, and through the hydraulic centrifugal action of a quiet micro-flow state, the feces and residual bait in the water body of the aquaculture pond are aggregated, reducing the sewage discharge volume, which can reduce the number of supporting sewage treatment system construction, reduce the construction cost and operating cost of the sewage treatment system, deepen the sewage treatment, and the treated sewage will be deeply purified together with the tail water and then returned to the aquaculture for recycling, improving the water resource utilization rate.

[0004] An embedded land-based circular pond recirculating aquaculture system includes a culture pond, a water inlet system, a tail water discharge system, a sewage discharge treatment system, and an external pond. The tail water discharge system includes a tail water discharge pipe and a drainage ditch. The inlet of the tail water discharge pipe is in the culture pond, and the drainage ditch is connected to the external pond. The sewage discharge treatment system includes a sewage discharge pipe, a sump well, a solid-liquid separation tank, a manure drying pond, and a tail water processor. The tail water processor is connected to the external pond by a pipe. The external pond is connected to the water inlet system by a pipe, and the water inlet system is connected to the culture pond by a water inlet pipe.

[0005] Further, the culture pond is cylindrical with a conical bottom, and a mesh partition is provided above the apex of the conical bottom.

[0006] Further, the water inlet system includes a water inlet pipe and a water distribution pipe. An aerator is provided on the water inlet pipe. The water distribution pipe is connected to the water inlet pipe and is vertically arranged along the wall of the culture pond, located in the middle and upper layers of the culture pond. The water distribution pipe is provided with water distribution openings whose orientation is tangential and parallel to the pool wall.

[0007] Further, an ultraviolet sterilizer is provided on the water inlet pipe.

[0008] Further, in the tail water discharge system, the tail water discharge pipe is arranged along the side wall of the cylindrical pond, extends downward to the junction with the conical bottom and then extends obliquely to the central axis, extends upward to the permanent water level height and then turns horizontally. A valve and a tee are provided in the horizontal section. One of the tees has an opening facing upward, and the other two are connected to the tail water discharge pipe. The horizontal section extends out of the culture pond and then extends downward to the drainage ditch.

[0009] Further, the water inlet of the tail water discharge pipe is at a height of 5 - 20 cm from the mesh partition along the conical axis at the bottom of the culture pond.

[0010] Further, in the sewage discharge treatment system, the sewage discharge pipe is installed at the apex of the conical bottom of the culture pond and is sequentially connected to the sump well and the solid-liquid separation tank. The sewage pump at the bottom of the solid-liquid separation tank transports the solids to the manure drying pond through a pipe, and the supernatant liquid at the upper part of the solid-liquid separation tank enters the tail water processor.

[0011] Further, a valve is provided on the sewage discharge pipe and is connected to a tee in the sump well. The two through passages of the tee are vertically arranged in the sump well, and a hanging ball is arranged in the tee. The hanging ball is connected to a vertical motor.

[0012] Further, a sewage pump is provided in the sump well, and the pipe connecting the sump well and the solid-liquid separation tank is connected to the sewage pump.

[0013] Further, the external pond includes a solid-liquid separation pond, a microbial solidification treatment pond, an aquatic plant and algae centralized treatment pond, and an oxidation pond. The tail water passes through the above-mentioned ponds in sequence.

[0014] The present invention can keep the oxygen content in the water quality of the aquaculture pond at a dissolved oxygen concentration suitable for fish growth. By means of separate discharge of sewage and tail water, through the hydraulic centrifugal action of a quiet micro-flow state, feces and residual baits in the water body of the aquaculture pond are aggregated, the sewage discharge volume is reduced, the number of supporting sewage treatment systems can be reduced, the construction cost and operation cost of the sewage treatment system are reduced, the sewage treatment is deepened, and the treated sewage and tail water are deeply purified and then returned to the aquaculture pond for recycling, improving the water resource utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the present invention;

[0016] Figure 2 It is a schematic diagram of the water inlet system of the present invention;

[0017] Figure 3 It is a schematic diagram of the tail water discharge system of the present invention;

[0018] Figure 4 It is a schematic diagram of the sewage discharge and treatment system of the present invention.

[0019] In the figure: 1 - aquaculture pond, 2 - water inlet system, 3 - mesh partition board, 4 - tail water discharge system, 5 - sewage discharge and treatment system, 6 - outer pond, 7 - pipeline, 21 - ultraviolet sterilizer, 22 - aerator, 23 - water distribution pipe, 24 - water distribution port, 25 - water inlet pipeline, 26 - water inlet ditch, 41 - tee, 42 - drainage ditch, 43 - valve, 44 - tail water discharge pipeline, 51 - sewage collection well, 52 - solid-liquid separation tank, 53 - tail water processor, 54 - manure drying pond, 55 - sewage discharge pipeline, 56 - valve, 57 - tee, 58 - sewage pump, 59 - sewage suction pump, 61 - solid-liquid separation pond, 62 - microbial solidification treatment pond, 63 - aquatic plant and algae centralized treatment pond, 64 - oxidation pond. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The sewage in the aquaculture pond described in the present invention refers to the water body containing a large amount of fish feces and residual baits and being seriously polluted, which is different from the tail water of the aquaculture pond. The tail water refers to the water body containing dissolved pollutants such as ammonia nitrogen and nitrite nitrogen and having more surface foam oil film, and the pollution degree is relatively light.

[0021] In order to make the purpose, technical solution and advantages of the invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] As Figure 1As shown in FIG. 4, an embedded land-based circular pond recirculating aquaculture system includes a culture pond 1, a water inlet system 2, a tail water discharge system 4, a sewage discharge treatment system 5, and an external pond 6. The tail water discharge system 4 includes a tail water discharge pipe 44 and a drainage ditch 42. The inlet of the tail water discharge pipe 44 is in the culture pond 1, and the drainage ditch 42 is connected to the external pond 6. The sewage discharge treatment system 5 includes a sewage discharge pipe 55, a sewage collection well 51, a solid-liquid separation tank 52, a manure drying pond 54, and a tail water processor 53. The tail water processor 53 is connected to the external pond 6 by a pipe. The external pond 6 is connected to the water inlet system 2 by a pipe 7, and the water inlet system 2 is connected to the culture pond 1 by a water inlet pipe 25.

[0023] Further, the culture pond 1 is cylindrical with a conical bottom. A mesh partition 3 is provided above the apex of the conical bottom. The conical bottom of the culture pond 1 and the mesh partition 3 form a static sewage collection area, which collects the settled fish feces and residual baits, and at the same time prevents the agitation of fish and water flow from affecting the sedimentation.

[0024] Further, the water inlet system 2 includes a water inlet pipe 25 and a water distribution pipe 23. An aerator 22 is provided on the water inlet pipe 25. The water distribution pipe 23 is connected to the water inlet pipe 25 and is vertically arranged along the culture pond wall, located in the middle and upper layers of the culture pond 1. The water distribution pipe 23 is provided with water distribution ports 24 whose orientation is tangential and parallel to the pond wall. The aerator 22 increases the dissolved oxygen content of the inlet water, so that the dissolved oxygen content in the culture pond 1 is maintained at a concentration suitable for the growth of fish, replacing the current method of arranging aeration pipes and blowers in the culture pond to supply air for oxygenation, avoiding the adverse effects of blower noise on the growth of fish, creating a quiet aquaculture environment, being conducive to the sedimentation of fish feces and residual baits and the rapid growth of fish. While evenly distributing water, the tangential water distribution ports 24 create a micro-flow swirling state, driving the fish feces and residual baits in the pond to rotate spirally and concentrate towards the bottom.

[0025] Further, an ultraviolet sterilizer 21 is provided on the water inlet pipe 25 to kill insects and bacteria in the inlet water. The external pond 6 is transported to the inlet ditch 26 through the pipe 7. The inlet ditch is provided with a filter dam to intercept particulate matter, algae, and turbidity, improving the water transparency and cleanliness, and then pumping the water into the water inlet pipe with a water inlet pump.

[0026] Preferably, the filter dam is trapezoidal, with a height of 1 m, an upper width of 2 m, and a bottom width of 5 m. The filter dam is composed of multiple layers of different materials, which are thick gravel, thick volcanic stone, thick activated carbon, thick fine sand, and thick soil from bottom to top, and water purification plants are planted on the upper part.

[0027] Furthermore, the tailwater discharge system 4, the tailwater discharge pipe 44 is arranged along the side wall of the cylindrical pool, extends downward to the junction with the conical bottom, extends obliquely to the center to the central axis, extends upward to the permanent water level height and turns horizontally, and a valve 43 and a tee 41 are provided in the horizontal section, one of the tee 41 openings is set upward, and the other two are connected to the tailwater discharge pipe 44, and the horizontal section extends out of the breeding pond 1 and then extends downward to the drain ditch 42. The upward opening of the tee 41 is used as the surface drainage path drain, and the opening is connected to the air to prevent the occurrence of accidents of siphoning and draining the breeding pond water.

[0028] The valve 43 is usually in a connected state, and the middle drainage outlet, i.e., the drainage outlet of the tailwater discharge pipe 44 in the pool, continuously discharges the water in the middle and lower layers according to the circulation principle, and discharges the low-concentration tailwater with high concentrations of ammonia nitrogen, nitrite nitrogen soluble pollutants, and suspended solids in the middle and lower layers of the culture pool 1. When more foam appears on the surface, the valve 43 is closed to block or reduce the flow of the tailwater discharge pipe 44, so that the water level in the culture pool 1 rises until it submerges the surface drainage outlet, i.e., the upward opening of the tee 41, and the overflow effect of the surface drainage outlet is used to discharge the water with more foam or oil film on the surface at a larger flow rate.

[0029] Preferably, the valve 43 is a vertical plug-in structure arranged on the tailwater discharge pipe, which has a simple structure, low manufacturing cost and is easy to operate. Of course, the valve 43 can also be a solenoid valve to facilitate automatic control.

[0030] Furthermore, the water inlet of the tailwater discharge pipe 44 is at a height of 5-20 cm from the mesh partition plate at the bottom cone axis.

[0031] Furthermore, the sewage discharge treatment system 5, the sewage discharge pipe 55 is installed at the top of the cone at the bottom of the conical bottom of the breeding pond 1, and is connected in sequence to the sewage collecting well 51 and the solid-liquid separation tank 52. The sewage suction pump 59 at the bottom of the solid-liquid separation tank 52 transports the solids to the drying pit 54 through the pipe, which can be used as organic fertilizer after drying. The supernatant on the top of the solid-liquid separation tank 52 enters the tail water treatment device 53, and is discharged into the outer pond 6 after being treated by the tail water treatment device 53.

[0032] Furthermore, there is a valve 56 on the sewage discharge pipe 55, which is connected to the tee 57 in the sewage collecting well 51. The two through-passes of the tee 57 are vertically arranged in the sewage collecting well 51. A hanging ball is arranged in the tee, and the hanging ball is connected to a vertical motor to control the discharge of sewage from the sewage discharge pipe.

[0033] Furthermore, a sewage pump 58 is provided in the sewage collecting well 51 , and a pipeline connecting the sewage collecting well 51 and the solid-liquid separation tank 52 is connected to the sewage pump 58 .

[0034] Furthermore, a filter bag filled with brushes is arranged inside the tail water processor 53, and a fluidized microorganism processor is arranged behind the filter bag. The fluidized microorganism processor is provided with bioplastic fillers.

[0035] Furthermore, microporous aeration pipes are evenly arranged at the bottom of the tail water processor 53. The microporous aeration pipes are connected to a blower to perform centralized aerobic degradation of the water body.

[0036] Furthermore, the outer pond 6 includes a solid-liquid separation pond 61, a microbial solidification treatment pond 62, an aquatic plant and algae centralized treatment pond 63, and an oxidation pond 64. The tail water passes through the above-mentioned ponds in sequence to complete the advanced purification treatment of the tail water.

[0037] Preferably, the solid-liquid separation pond 61 adopts a civil engineering secondary sedimentation area; the microbial solidification treatment pond 62 is provided with hanging brushes or cotton fluffs for attaching and culturing microorganisms; there are two aquatic plant and algae centralized treatment ponds 63, and the two ponds are arranged in series; the oxidation pond 64 plays a role of advanced purification buffer, and fish, mussels, submerged plants and emergent plants are stocked.

[0038] Preferably, in the oxidation pond 64, 80 - 200 silver carp, 10 - 100 bighead carp and 2 Hyriopsis cumingii (scallops can be stocked in seawater) can be stocked per mu, 10 - 20 submerged plants and 5 - 15 emergent plants can be planted per square meter.

[0039] Certainly, the present invention can also have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present invention.

Claims

1. An embedded land-based circular pool circulating water aquaculture system, Features: The invention comprises a breeding pond (1), a water inlet system (2), a tailwater discharge system (4), a sewage discharge treatment system (5), and an outer pond (6); the tailwater discharge system (4) comprises a tailwater discharge pipe (44) and a drainage ditch (42); the inlet of the tailwater discharge pipe (44) is in the breeding pond (1), and the drainage ditch (42) is connected to the outer pond (6); the sewage discharge treatment system (5) comprises a sewage discharge pipe (55), a sewage collection well (51), a solid-liquid separation tank (52), a manure drying tank (54), and a tailwater treatment device (53); the tailwater treatment device (53) has a pipe connected to the outer pond (6); the outer pond (6) has a pipe (7) connected to the water inlet system (2), and the water inlet system (2) has a water inlet pipe (25) connected to the breeding pond (1); The water inlet system (2) comprises a water inlet pipe (25) and a water distribution pipe (23), wherein the water inlet pipe (25) is provided with an aerator (22), the water distribution pipe (23) is connected to the water inlet pipe (25), the water distribution pipe (23) is vertically arranged along the wall of the culture pond and is located at the middle and upper layers of the culture pond (1), and the water distribution pipe (23) is provided with a water distribution port (24) oriented tangentially and parallel to the pond wall; The sewage discharge treatment system (5) comprises a sewage discharge pipe (55) installed at the top of the conical bottom of the culture pond (1), and connected in sequence to a sewage collection well (51) and a solid-liquid separation tank (52). A sewage suction pump (59) at the bottom of the solid-liquid separation tank (52) transports solids to a manure drying tank (54) through a pipe, and supernatant at the top of the solid-liquid separation tank (52) enters a tail water treatment device (53). Microporous aeration pipes are evenly arranged at the bottom of the tail water treatment device (53), and the micro-aeration pipes are connected to a blower. The tailwater discharge system (4) is arranged along the side wall of the cylindrical pool, extending downward to the junction with the conical bottom, extending obliquely toward the center to the center axis, extending upward to the permanent water level height, and then being arranged horizontally. A valve (43) and a tee (41) are provided in the horizontal section, one of the tee openings (41) is arranged upward, and the other two openings are connected to the tailwater discharge pipe (44). The horizontal section extends out of the culture pool (1) and then extends downward to the drainage ditch (42); The valve (43) is normally in a connected state, and the middle drainage outlet, i.e., the drainage outlet of the tailwater drainage pipe (44) in the pool continuously discharges the water in the middle and lower layers according to the flow-through principle, and discharges the low-concentration tailwater with high concentrations of ammonia nitrogen, nitrite nitrogen dissolved pollutants, and suspended solids in the middle and lower layers of the aquaculture pond (1); when a lot of foam appears on the surface, the valve (43) is closed to block or reduce the flow of the tailwater drainage pipe (44), so that the water level in the aquaculture pond (1) rises until it submerges the surface drainage outlet, i.e., the upward opening of the tee (41), and the water with a lot of foam or oil film on the surface is discharged at a larger flow rate by utilizing the overflow effect of the surface drainage outlet.

2. The embedded land-based circular pond circulating water aquaculture system according to claim 1, Features: The culture pond (1) is cylindrical, with a conical bottom, and a mesh partition (3) is arranged above the top of the conical bottom.

3. The embedded land-based circular pond recirculating aquaculture system according to claim 2, characterized in that: an ultraviolet sterilizer (21) is provided on the water inlet pipe (25).

4. The embedded land-based circular pond recirculating aquaculture system according to claim 2, characterized in that: the water inlet of the tail water discharge pipe (44) is at a height of 5-20 cm from the mesh partition along the conical axis at the bottom of the aquaculture pond (1).

5. The embedded land-based circular pond recirculating aquaculture system according to claim 1, characterized in that: a valve (56) is provided on the sewage discharge pipe (55), and it is connected to a tee (57) in the sewage collection well (51). The two through ports of the tee (57) are vertically arranged in the sewage collection well (51). A hanging ball is arranged in the tee, and the hanging ball is connected to a vertical motor.

6. The embedded land-based circular pond recirculating aquaculture system according to claim 5, characterized in that: a sewage pump (58) is arranged in the sewage collection well (51), and the pipe connecting the sewage collection well (51) and the solid-liquid separation tank (52) is connected to the sewage pump (58).

7. The embedded land-based circular pond recirculating aquaculture system according to claim 1, characterized in that: the outer pond (6) includes a solid-liquid separation pond (61), a microbial solidification treatment pond (62), an aquatic plant and algae centralized treatment pond (63), and an oxidation pond (64), and the tail water passes through the above-mentioned ponds in sequence.

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