Air floatation tank for outer pond culture

Abstract

The utility model provides an air floatation tank for outer pond culture, which comprises a tank body and a jet device, the tank body is of an open box type structure, a partition plate is arranged in the middle of the tank body and divides the tank body into a slow flow area and an air floatation area, a water inlet pipe is arranged at the upper end of the slow flow area, the jet device is mounted on the partition plate, and a water outlet pipe is arranged at the lower end of the jet device. The jet pump is connected with an external air compressor, the jet pump sprays towards one side of the air flotation area, the bottom end of the air flotation area is connected with a water outlet pipe, the water outlet pipe is located on one side opposite to the jet pump, and a foam collector is installed in the air flotation area and located on one side of the water outlet pipe. The external pond culture device is suitable for external pond culture in a large-area water area, can effectively remove suspended solids and pollutants in water, improve water quality and increase the content of dissolved oxygen in the water, and is convenient to use and maintain and low in use cost.

Description

Technical Field

[0001] This utility model relates to the field of aquaculture water treatment devices, specifically to an air flotation tank for outdoor aquaculture. Background Technology

[0002] Outdoor pond aquaculture refers to a farming method conducted in natural water bodies such as small to medium-sized lakes, rivers, or tributaries. This method involves using tools such as bamboo mats or nets to block off portions of the water or the inlets and outlets for fish farming. Outdoor pond aquaculture utilizes natural feed, resulting in low costs, minimal labor, and high profitability.

[0003] In existing recirculating aquaculture systems, wastewater treatment involves mechanical filtration and sedimentation before entering the flotation tank, ultraviolet sterilization tank, and dissolved oxygen replenishment tank for biofilm treatment, organic matter removal via flotation, ozone and ultraviolet sterilization, and oxygen replenishment, respectively, thus transforming it into clean, fresh aquaculture water for reuse. The flotation equipment utilizes a bubble generator to atomize bubbles, which are then thoroughly mixed with the incoming wastewater. Under the shear force of the water, the gas breaks down into microbubbles that diffuse into the water, rising steadily and vertically within the flotation equipment. This forms flotation, where the microbubbles adhere to suspended matter in the water, creating floats with a density less than water, which are then discharged through the bubble outlet, completing the water purification process.

[0004] Currently, in indoor aquaculture systems, due to the small size of the aquaculture area and the relatively stable pollutants in the aquaculture water, dissolved air flotation (DAF) tanks generally adopt bottom aeration, that is, aeration discs or aeration pipes are installed at the bottom of the DAF tank. The advantages of aeration discs or aeration pipes are that the aeration bubbles are small in diameter, the gas-liquid interface area is large, the bubble diffusion is uniform, the corrosion resistance is strong, and the oxygen utilization rate is high. The disadvantages are that there is a risk of clogging, and because they are installed at the bottom of the tank, maintenance is difficult, replacement is not easy, and the operating cost is high. They are particularly unsuitable for water treatment in large-scale outdoor pond aquaculture. Outdoor pond aquaculture not only has a large water area, but also more complex water quality. Therefore, developing a new DAF tank suitable for water treatment in outdoor pond aquaculture is an urgent problem to be solved. Summary of the Invention

[0005] The purpose of this utility model is to provide an air flotation tank for outdoor aquaculture, which is suitable for outdoor aquaculture in large water areas. It can effectively remove suspended solids and pollutants from the water, improve water quality, increase dissolved oxygen content in the water, and is easy to use and maintain with low operating costs.

[0006] The technical solution adopted in this utility model is as follows:

[0007] An air flotation tank for outdoor aquaculture includes a tank body and a jetting device. The tank body is an open box-type structure. A partition is provided in the middle of the tank body, dividing the tank body into two areas: a slow-flow zone and an air flotation zone. An inlet pipe is provided at the upper end of the slow-flow zone. The jetting device is installed on the partition. The jetting pump is connected to an external air compressor and sprays towards the air flotation zone. An outlet pipe is connected to the bottom end of the air flotation zone and is located on the side opposite to the jetting pump. A foam collector is installed in the air flotation zone and is located on the side of the outlet pipe.

[0008] Furthermore, the jet device consists of multiple jet pumps arranged in a row in the lower middle part of the partition.

[0009] Furthermore, the outlet pipe has an inverted U-shaped structure, with the top of the U-shaped outlet pipe being lower than the height of the inlet pipe.

[0010] Furthermore, a foam drain pipe is connected to the foam collector.

[0011] Furthermore, a drain pipe is provided at the bottom of both the slow-flow zone and the air flotation zone, and a valve body is provided on the drain pipe.

[0012] Compared with the prior art, the beneficial effects obtained by this utility model are as follows:

[0013] This invention divides the tank into two zones: a slow-flow zone and an air flotation zone. Water requiring purification enters the air flotation tank and first undergoes slow-flow sedimentation in the slow-flow zone. Then, air is mixed with water and pumped into the air flotation zone via a jet pump. The air flotation process effectively removes suspended solids and pollutants from the water, improving water quality. Simultaneously, it increases dissolved oxygen levels, promoting the healthy growth of aquaculture organisms. This invention features a simple structure, convenient maintenance, and the jet aeration method is less prone to clogging. It provides strong stirring and oxygenation capabilities, making it suitable for large-area outdoor pond aquaculture. Furthermore, it is easy to use and maintain, and has low operating costs. Attached Figure Description

[0014] Appendix Figure 1 This is a perspective view of the air flotation tank for outdoor aquaculture as described in this utility model;

[0015] Appendix Figure 2 This is a top view of the air flotation tank for outdoor aquaculture described in this utility model;

[0016] Appendix Figure 3 This is a front view of the air flotation tank used for outdoor aquaculture as described in this utility model. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1 , Figure 2 As shown, an air flotation tank for outdoor aquaculture includes a tank body 1 and a jetting device 4. The tank body 1 is an open box-type structure, preferably a rectangular structure made of cement bricks. A partition 11 is provided in the middle of the tank body 1, dividing the tank body 1 into two areas: a slow-flow zone 2 and an air flotation zone 3. An inlet pipe 21 is provided at the upper end of the slow-flow zone 2, which is used to introduce settled aquaculture water into the slow-flow zone 2. The slow-flow zone 2 is used to allow water to flow slowly, which can effectively reduce the accumulation of suspended solids and organic matter in the water. The jetting device 4 is installed on the partition 11 and consists of multiple jet pumps arranged in a row. The jet pump is arranged in the lower middle part of the partition 11. It is connected to an external air compressor and sprays towards the side of the flotation zone 3. The water in the slow flow zone 2 is mixed with air and pumped into the flotation zone 3 by the jet pump. When in use, the jet pump sprays the water in the slow flow zone 2 through the nozzle at high speed through the jet nozzle, and draws air into the water to form microbubbles. These bubbles combine with the suspended solids in the water in the flotation tank to form flotation bodies. The buoyancy of the bubbles is used to float the suspended solids to the water surface to form foam or scum, thereby separating the suspended matter in the water. At the same time, during the flotation process, the air and water are fully mixed and energy exchanged, which increases the dissolved oxygen content in the water.

[0019] The bottom end of the air flotation zone 3 is connected to a water outlet pipe 52, which is located on the side opposite to the jet pump, such as... Figure 3As shown, the outlet pipe 52 has an inverted U-shaped structure, with the top of the U-shaped outlet pipe 52 being lower than the height of the inlet pipe 21. When the water level in the flotation zone 3 is higher than the top of the U-shaped outlet pipe 52, the water in the flotation zone 3 is discharged through the outlet pipe 52 into the next purification process. Designing the outlet pipe 52 as an inverted U-shape allows a certain water level to be maintained in the flotation zone 3, effectively extending the time the water spends in the flotation zone 3 and improving the purification effect. A foam collector 5 is installed in the flotation zone 3, and the foam collector 5 is located at... On one side of the outlet pipe 52, the foam collector 5 is used to collect the foam generated in the flotation zone 3. A foam drain pipe 51 is connected to the foam collector 5, and the collected foam is discharged from the flotation zone 3 through the foam drain pipe 51. Since the jet pump faces the outlet pipe 52, placing the foam collector 5 on the outlet pipe 52 side will cause the water in the flotation zone 3 to move towards the outlet pipe 52 side due to inertia. The foam suspended on the surface of the water in the flotation zone 3 will also move towards the outlet pipe 52 side. Therefore, placing the foam collector 5 on the outlet pipe 52 side can effectively improve the foam collection efficiency.

[0020] Both the slow-flow zone 2 and the air flotation zone 3 are equipped with a drain pipe 6 at their bottom ends. The drain pipe 6 is equipped with a valve body. Opening the valve body allows the impurities deposited in the slow-flow zone 2 and the air flotation zone 3 to be discharged through the drain pipe 6.

[0021] This invention divides the tank into two zones: a slow-flow zone and an air flotation zone. Water requiring purification enters the air flotation tank and first undergoes slow-flow sedimentation in the slow-flow zone. Then, air is mixed with water and pumped into the air flotation zone via a jet pump. The air flotation process effectively removes suspended solids and pollutants from the water, improving water quality. Simultaneously, it increases dissolved oxygen levels, promoting the healthy growth of aquaculture organisms. This invention features a simple structure, convenient maintenance, and the jet aeration method is less prone to clogging. It provides strong stirring and oxygenation capabilities, making it suitable for large-area outdoor pond aquaculture. Furthermore, it is easy to use and maintain, and has low operating costs.

[0022] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An air flotation tank for outdoor aquaculture, comprising a tank body and a jetting device, characterized in that: The tank is an open box-type structure with a partition in the middle dividing it into a slow-flow zone and an air flotation zone. An inlet pipe is installed at the upper end of the slow-flow zone. The jetting device is mounted on the partition, and the jetting pump is connected to an external air compressor. The jetting pump sprays towards the air flotation zone. An outlet pipe is connected to the bottom of the air flotation zone and is located on the side opposite to the jetting pump. A foam collector is installed in the air flotation zone and is located on the side of the outlet pipe.

2. The air flotation tank for outdoor aquaculture according to claim 1, characterized in that: The jet device consists of multiple jet pumps arranged in a row in the lower middle part of the partition.

3. The air flotation tank for outdoor aquaculture according to claim 1, characterized in that: The outlet pipe has an inverted U-shaped structure, with the top of the U-shaped outlet pipe being lower than the height of the inlet pipe.

4. The air flotation tank for outdoor aquaculture according to claim 1, characterized in that: A foam drain pipe is connected to the foam collector.

5. The air flotation tank for outdoor aquaculture according to claim 1, characterized in that: Both the slow-flow zone and the air flotation zone are equipped with a drain pipe at their bottom ends, and a valve body is installed on the drain pipe.

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