Circulating water treatment system with return pit separation structure

Abstract

This invention relates to a circulating water treatment structure in a land-based aquaculture system. [Solution] The circulating water treatment system of the present invention comprises a tank for raising fish and shrimp, a drum filtration device for treating the rearing water discharged from the tank, a return pit located downstream of the drum filtration device, a circulation pump, a shellfish layer, and a seaweed layer. The return pit is configured by separating a foam-side region into which the incoming water is introduced and a still-water-side region that communicates with the suction of the circulation pump. After natural aeration and degassing by the incoming water occurs in the foam-side region, only the de-energized water moves to the still-water-side region. This enables stable circulation operation with suppressed foam mixing without the need for water shut-off operations or flow control valves.

Description

Technical Field

[0001] The present invention relates to a circulating water treatment structure in an onshore aquaculture system, and particularly relates to a return pipe after drum filtration, the structure of a return pit, and a stable configuration of circulating water based on the idea of selecting the pipe diameter.

Background Art

[0002] In conventional onshore aquaculture facilities, the adjustment of the circulating flow rate often depends on valve operation, an overflow structure, or a mechanical aeration device, resulting in problems such as a complicated equipment configuration and a large burden on operation and management.

[0003] Also, there is a problem that in the return system, bubbles and turbulence directly flow into the suction side of the circulation pump, making it easy to cause unstable operation of the pump, overflow, and bubble mixing.

Summary of the Invention

[0004] An object of the present invention is to provide a circulating water treatment structure capable of stably returning circulating water without using a water stop operation or a flow rate adjustment valve, and to achieve simplification of operation management, prevention of bubble mixing, and improvement of maintainability.

[0005] The circulating water treatment system according to the present invention includes an aquarium (1) for raising fish, a drum filtration device (2) for treating the breeding water discharged from the aquarium, a return pit (3) provided on the downstream side of the drum filtration device (2), a circulation pump (4), a shellfish layer (5), and a seaweed layer (6).

[0006] The return pit (3) is configured to have a bubble side region into which the treated water from the drum filtration device (2) is introduced and a static water side region communicating with the suction portion of the circulation pump (4), and the two regions are physically separated and formed.

Means for Solving the Problems

[0007] The foam-side region and the still-water-side region are connected via a connecting pipe (7) provided near the water surface of the still-water-side region, and only water that has been de-energized in the foam-side region is allowed to move to the still-water-side region.

[0008] The circulation pump (4) draws in culture water from the still water side area and sends it to the shellfish layer (5). From the outlet of the shellfish layer (5), the culture water is transported by gravity to the seaweed layer (6), and from the outlet of the seaweed layer (6), the culture water returns to the bubble side area of ​​the return pit (3). [Effects of the Invention]

[0009] According to the present invention, simple operation is possible in circulating water treatment without the need for water shut-off operations or flow rate adjustment operations.

[0010] Furthermore, by separating the foam side area and the still water side area within the return pit (3), it is possible to prevent foam contamination, ensure stable operation of the circulation pump (4), improve equipment maintainability, and enhance the overall reliability of the circulation system. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described below with reference to Figure 1.

[0012] The treated water from the drum filtration device (2) is guided to the upper part of the foam-side region of the return pit (3), and falls into the air from above the water surface of the foam-side region.

[0013] By draining the water, natural aeration and gas removal occur without the need for mechanical aeration equipment.

[0014] A drain (9) is provided at the bottom of the return pit (3), allowing only settled solids and stagnant material to be discharged, thus eliminating the need for water shutoff operations or complex adjustment operations during normal operation.

[0015] This return pit (3) structure stabilizes the circulating water using only water drop, gravity flow, and water level difference, achieving simple and reliable circulating water treatment without the use of aeration devices, stirring devices, or movable valves. [Brief explanation of the drawing]

[0016] Figure 1 is an overall diagram of the circulating water treatment system according to the present invention. [Explanation of Symbols]

[0017] 1. Fish and shrimp tank 2 Drum Filtration System 3 Return pit 4. Circulation pump 5 Shellfish layer 6 seaweed layer 7 Communication piping 8. Outlet 9 Drain [Patent Document 1] none [Non-Patent Document 1] none

Claims

1. A land-based aquaculture system comprising a tank for raising fish, a drum filtration device for treating the water discharged from the tank, a return pit provided downstream of the drum filtration device, a circulation pump, a shellfish layer, and a seaweed layer, wherein the return pit is physically separated into a foam-side region into which water from the drum filtration device is introduced and a still-water-side region communicating with the suction of the circulation pump, the foam-side region and the still-water-side region are in communication via a connecting pipe provided near the water surface of the still-water-side region, the circulation pump sucks up the water from the still-water-side region and sends it to the shellfish layer, the water is transported by gravity from the outlet of the shellfish layer to the seaweed layer, and the water that has passed through the seaweed layer is guided to the foam-side region of the return pit.

2. A land-based aquaculture system according to claim 1, characterized in that the treated water from the drum filtration device is introduced from above the water surface in the foam-side region of the return pit.

3. A land-based aquaculture system according to claim 1 or 2, characterized in that a drain for discharging settled solids or stagnant matter is provided at the bottom of the return pit.

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