Efficient denitrification and dephosphorization device for mariculture wastewater

Abstract

The utility model discloses an efficient denitrification and dephosphorization device for mariculture wastewater. The efficient denitrification and dephosphorization device comprises a culture water tank, a drainage pipe, a valve, a coarse filtering tank, a filtering grating, a connecting water pump and a denitrification and dephosphorization assembly, according to the utility model, soluble nitrogen and phosphorus in a water body are converted into large-particle (20-800mu m) microorganisms and algae biomass by utilizing a biofloc technology, part of large-particle filter clusters are absorbed and utilized by filter-feeding animals, part of phosphate and nitrate in tail water are absorbed by utilizing plants and large algae, and finally, a physical filtering system is utilized to filter the tail water. The residual large-particle floccules are removed by the drum filter, and then the residual large-particle floccules are disinfected and purified by the protein separator and the ozone generator and then return to the high-density circulating aquaculture system, so that the expected removal rate of ammonia nitrogen and nitrite in tail water reaches 60% or above, and the daily water change amount of the high-density circulating aquaculture system with the nitrogen and phosphorus removal component is less than 2%.

Description

Technical Field

[0001] This utility model relates to the field of aquaculture, and in particular to a highly efficient denitrification and dephosphorization device for marine aquaculture wastewater. Background Technology

[0002] Recirculating aquaculture is a new type of aquaculture model that uses a series of water treatment units to treat wastewater generated in aquaculture ponds and then recycle it for reuse, thereby solving the problem of low water resource utilization. At the same time, it provides a stable, reliable, comfortable and high-quality living environment for farmed organisms, and provides favorable conditions for high-density aquaculture.

[0003] The current high-density recirculating seawater aquaculture system typically suffers from the accumulation of ammonia nitrogen and phosphorus, requiring water changes that are as high as 5%-10% per day, which is not conducive to the conservation and utilization of water resources. Furthermore, small particles (approximately 40% TSS at the filter mesh diameter) cannot be removed, resulting in unsatisfactory effluent purification. Utility Model Content

[0004] Therefore, in order to overcome the above-mentioned shortcomings, this utility model provides a high-efficiency nitrogen and phosphorus removal device for marine aquaculture wastewater.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a high-efficiency nitrogen and phosphorus removal device for marine aquaculture wastewater, comprising an aquaculture pond, a drain pipe, a valve, a coarse filter tank, a filter screen, a connecting water pump, and a nitrogen and phosphorus removal assembly; a drain pipe is provided at the right end of the aquaculture pond, and a valve is installed in the middle of the drain pipe; the coarse filter tank is connected to the aquaculture pond via the drain pipe, and a filter screen is installed inside the coarse filter tank; the coarse filter tank is connected to the nitrogen and phosphorus removal assembly via a connecting water pump; the nitrogen and phosphorus removal assembly... The phosphorus component includes a biofloc cultivation module, a water pump, a filter-feeding animal and seaweed cultivation pond, a supplemental lighting plant and algae cultivation pond, a drum filter, and a separation device. The biofloc cultivation module is connected to the coarse filtration pond via a water pump. The filter-feeding animal and seaweed cultivation pond is connected to the biofloc cultivation module via a water pump. The supplemental lighting plant and algae cultivation pond is connected to the filter-feeding animal and seaweed cultivation pond. The drum filter is connected to the supplemental lighting plant and algae cultivation pond. The separation device is connected to the drum filter.

[0006] Preferably, the biofloc cultivation module includes a biofloc and Chlorella cultivation tank, a Bacillus subtilis cultivation tank, an organic carbon source tank, and a Chlorella cultivation tank. The biofloc and Chlorella cultivation tank are respectively connected to a coarse filtration tank, a filter-feeding animal breeding tank, and a seaweed cultivation tank. The Bacillus subtilis cultivation tank is used to cultivate Bacillus subtilis, the organic carbon source tank is used to place organic carbon sources, and the Chlorella cultivation tank is used to cultivate Chlorella.

[0007] In a further preferred embodiment, the separation device includes a protein separator and an ozone generator, wherein the protein separator is connected to a drum filter and is also connected to the ozone generator.

[0008] In a further preferred embodiment, the water retention time in the biofloc and Chlorella cultivation pond is 4-5 hours, and a small amount of sludge is laid at the bottom of the biofloc and Chlorella cultivation pond to facilitate the formation of bioflocs and the cultivation of Litopenaeus vannamei in the biofloc and Chlorella cultivation pond.

[0009] In a further preferred embodiment, the water retention time in the filter-feeding animal breeding and seaweed cultivation pond is 4-5 hours, and the filter-feeding animals are preferably shellfish and sea cucumbers. Seaweed such as sea grapes are planted on the top, and filter-feeding animals such as sea shellfish and mollusks are cultivated at the bottom.

[0010] Preferably, the supplemental lighting area in the supplemental lighting plant and algae cultivation pond is at least 132m². 2 .

[0011] The beneficial effects of this utility model are:

[0012] This invention utilizes biofloc technology to convert soluble nitrogen and phosphorus in water into large-particle (20μm-800μm) microbial and algal biomass. Filter-feeding animals absorb some of the large-particle filter flocs, while plants and large algae absorb some of the phosphate and nitrate in the effluent. Finally, a physical filtration system, namely a drum filter, removes the remaining large-particle flocs. After passing through a protein separator and an ozone generator for disinfection and purification, the effluent is returned to a high-density recirculating aquaculture system. This achieves a target ammonia nitrogen and nitrite removal rate of over 60% in the effluent. Furthermore, the high-density recirculating seawater aquaculture system with added nitrogen and phosphorus removal components has a daily water exchange rate of less than 2%, effectively achieving water purification and conservation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the overall structure of the denitrification and dephosphorization component of this utility model.

[0016] The components include: aquaculture pond-1, drainage pipe-2, valve-3, coarse filter pond-4, filter grid-5, connecting water pump-6, denitrification and dephosphorization components-7, biofloc cultivation module-71, water pump-72, filter-feeding animal breeding and seaweed cultivation pond-73, supplemental lighting plant and algae cultivation pond-74, drum filter-75, separation equipment-76, biofloc and Chlorella cultivation pond-711, Bacillus subtilis cultivation tank-712, organic carbon source tank-713, Chlorella cultivation tank-714, protein separator-761, and ozone generator-762. Detailed Implementation

[0017] To further explain the technical solution of this utility model, a detailed description is provided below through specific embodiments.

[0018] Please see Figure 1-3 This utility model provides a high-efficiency nitrogen and phosphorus removal device for marine aquaculture wastewater, including an aquaculture tank 1, a drain pipe 2, a valve 3, a coarse filter tank 4, a filter grid 5, a connecting water pump 6, and a nitrogen and phosphorus removal assembly 7. The drain pipe 2 is located at the right end of the aquaculture tank 1, and the valve 3 is installed in the middle of the drain pipe 2. The coarse filter tank 4 is connected to the aquaculture tank 1 via the drain pipe 2, and a filter grid 5 is installed inside the coarse filter tank 4. The coarse filter tank 4 is connected to the nitrogen and phosphorus removal assembly 7 via the connecting water pump 6. The nitrogen and phosphorus removal assembly 7 includes a biofloc cultivation module 71. The system includes a water pump 72, a filter-feeding animal breeding and seaweed cultivation pond 73, a supplemental lighting plant and algae cultivation pond 74, a drum filter 75, and a separation device 76. The biofloc cultivation module 71 is connected to the coarse filter pond 4 via the water pump 6. The filter-feeding animal breeding and seaweed cultivation pond 73 is connected to the biofloc cultivation module 71 via the water pump 72. The supplemental lighting plant and algae cultivation pond 74 is connected to the filter-feeding animal breeding and seaweed cultivation pond 73. The drum filter 75 is connected to the supplemental lighting plant and algae cultivation pond 74. The separation device 76 is connected to the drum filter 75.

[0019] In this embodiment, the biofloc cultivation module 71 includes a biofloc and Chlorella cultivation tank 711, a Bacillus subtilis cultivation tank 712, an organic carbon source tank 713, and a Chlorella cultivation tank 714. The biofloc and Chlorella cultivation tank 711 is connected to the coarse filtration tank 4 and the filter-feeding animal breeding and seaweed planting tank 73, respectively. The Bacillus subtilis cultivation tank 712 is used to cultivate Bacillus subtilis, the organic carbon source tank 713 is used to place the organic carbon source, and the Chlorella cultivation tank 714 is used to cultivate Chlorella.

[0020] Organic carbon sources include brown sugar and potassium carbonate.

[0021] In this embodiment, the separation device 76 includes a protein separator 761 and an ozone generator 762. The protein separator 761 is connected to the drum filter 75 and is also connected to the ozone generator 762.

[0022] In this embodiment, the water retention time in the biofloc and Chlorella cultivation pond 711 is 4-5 hours, and a small amount of sludge is laid at the bottom of the biofloc and Chlorella cultivation pond 711 to facilitate the formation of bioflocs and the cultivation of Litopenaeus vannamei in the biofloc and Chlorella cultivation pond 711.

[0023] In this embodiment, the water retention time in the filter-feeding animal breeding and seaweed planting pond 73 is 4-5 hours, and the filter-feeding animals are preferably shellfish and sea cucumbers. Seaweed such as sea grapes are planted on the top, and filter-feeding animals such as sea shellfish and mollusks are cultured at the bottom.

[0024] In this embodiment, the supplemental lighting area in the supplemental lighting plant and algae cultivation pond 74 is at least 132m². 2 .

[0025] In this embodiment, taking 840 tons of aquaculture water as an example, the aquaculture wastewater is 10m³ 3 Discharged at a rate of / h, in a volume of 80m³ 3 The biofloc and Chlorella cultivation pond 711 and the filter-feeding animal breeding and seaweed cultivation pond 73 were treated in the 132m... 2 Supplemental lighting was applied to 74 treatments of supplemental plants and algae cultivation ponds with a total area of ​​10m². 3 The water is filtered at a rate of / h in the drum filter 75, and finally purified by the separation equipment 76 at a rate of 10m³ / h. 3 Returning to aquaculture pond 1 at a rate of / h.

[0026] In this embodiment, taking an 840-ton aquaculture water body as an example, the nitrogen and phosphorus removal component 7 can achieve a removal rate of more than 60% for ammonia nitrogen and nitrite. In an 840-ton system, this is equivalent to a water exchange volume of more than 6 tons / hour (144 tons / day, 17% per day), with a daily water exchange volume of less than 2%, which greatly achieves the purpose of water conservation and water purification.

[0027] See Figures 1-3 When in use, taking an 840-ton aquaculture water body as an example, the water in the aquaculture pond 1 is discharged into the coarse filtration pond 4 through the drain pipe 2. It is then coarsely filtered by the filter grid 5 in the coarse filtration pond 4, and then pumped into the denitrification and dephosphorization component 7 by the connected water pump 6. The water first enters the biofloc and Chlorella cultivation pond 711 for floc reaction.

[0028] By adding Bacillus subtilis, Chlorella, and organic carbon sources to the biofloc and Chlorella cultivation pond 711, the carbon-nitrogen ratio in the water is adjusted, the number of abnormal bacteria in the water is increased, and the inorganic nitrogen in the water is converted into microbial protein by microbial fertilizers. This forms bioflocs that can be directly ingested by filter-feeding aquaculture organisms, solving the problem of debris and feed retention in the water. This purifies the water quality and reduces the amount of water exchange. The water stays in the biofloc and Chlorella cultivation pond 711 for 4-5 hours, removing ammonia nitrogen and nitrates.

[0029] The water treated in the biofloc and Chlorella cultivation pond 711 is pumped to the filter-feeding animal breeding and seaweed planting pond 73, where it stays for 4-5 hours. Filter-feeding animals, such as shellfish and sea cucumbers, absorb and utilize some of the large filter flocs. Then, the treated water is pumped to the supplemental lighting plant and algae cultivation pond 74, where plants and large algae absorb some of the phosphates and nitrates in the effluent.

[0030] The remaining large flocs are removed by the drum filter 75, and then disinfected and purified by the protein separator 761 and the ozone generator 762 before returning to the high-density recirculating aquaculture system. After treatment by bio-flocs and filter feeders, the expected removal rate of ammonia nitrogen and nitrite in the effluent reaches more than 60%, and the daily water exchange is less than 2%, effectively achieving the purpose of water purification and water conservation.

[0031] The control method of this utility model is to control the device by manually starting and stopping the switch. The wiring diagram of the power component and the supply of power are common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and wiring layout will not be explained in detail.

[0032] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0033] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-efficiency nitrogen and phosphorus removal device for marine aquaculture wastewater, comprising an aquaculture pond (1), a drain pipe (2), a valve (3), a coarse filter pond (4), a filter grid (5), a connecting water pump (6), and a nitrogen and phosphorus removal assembly (7); A drain pipe (2) is provided at the right end of the aquaculture pond (1), and a valve (3) is installed in the middle of the drain pipe (2); The coarse filtration tank (4) is connected to the aquaculture pond (1) by a drainage pipe (2), and a filter grid (5) is installed inside the coarse filtration tank (4); The coarse filtration tank (4) is connected to the denitrification and dephosphorization assembly (7) via a water pump (6); The denitrification and dephosphorization component (7) includes a biofloc cultivation module (71), a water pump (72), a filter-feeding animal breeding and seaweed planting pond (73), a supplemental lighting plant and algae cultivation pond (74), a drum filter (75), and a separation device (76). The biofloc cultivation module (71) is connected to the coarse filter pond (4) via the water pump (6). The filter-feeding animal breeding and seaweed planting pond (73) is connected to the biofloc cultivation module (71) via the water pump (72). The supplemental lighting plant and algae cultivation pond (74) is connected to the filter-feeding animal breeding and seaweed planting pond (73). The drum filter (75) is connected to the supplemental lighting plant and algae cultivation pond (74). The separation device (76) is connected to the drum filter (75).

2. The high-efficiency nitrogen and phosphorus removal device for marine aquaculture wastewater according to claim 1, characterized in that: The biofloc cultivation module (71) includes a biofloc and Chlorella cultivation tank (711), a Bacillus subtilis cultivation tank (712), an organic carbon source tank (713), and a Chlorella cultivation tank (714). The biofloc and Chlorella cultivation tank (711) is connected to the coarse filtration tank (4) and the filter-feeding animal breeding and seaweed planting tank (73), respectively. The Bacillus subtilis cultivation tank (712) is used to cultivate Bacillus subtilis, the organic carbon source tank (713) is used to place organic carbon sources, and the Chlorella cultivation tank (714) is used to cultivate Chlorella.

3. The high-efficiency nitrogen and phosphorus removal device for marine aquaculture wastewater according to claim 1, characterized in that: The separation device (76) includes a protein separator (761) and an ozone generator (762). The protein separator (761) is connected to the drum filter (75) and is also connected to the ozone generator (762).

4. The high-efficiency nitrogen and phosphorus removal device for marine aquaculture wastewater according to claim 2, characterized in that: The water retention time in the biofloc and Chlorella cultivation pond (711) is 4-5 hours.

5. The high-efficiency nitrogen and phosphorus removal device for marine aquaculture wastewater according to claim 1, characterized in that: The water retention time in the filter-feeding animal breeding and seaweed cultivation pond (73) is 4-5 hours.

6. The high-efficiency nitrogen and phosphorus removal device for marine aquaculture wastewater according to claim 1, characterized in that: The supplemental lighting area in the supplemental lighting plant and algae cultivation pond (74) is at least 132m². 2 .

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