Fishery breeding tail water treatment and nitrogen and phosphorus resource utilization algae culture device

Abstract

The utility model belongs to the technical field of fishpond breeding tail water treatment, and particularly relates to a fishpond breeding tail water treatment and nitrogen and phosphorus resource utilization algae culture device. The algae culture device for fishery breeding tail water treatment and nitrogen and phosphorus resource utilization comprises a front-end biological treatment unit, a nitrogen and phosphorus resource utilization algae culture unit, an effluent oxygenation unit and a device chamber, the front-end biological treatment unit comprises a first-echelon biological treatment device and a second-echelon biological treatment device, the first-echelon biological treatment device, the second-echelon biological treatment device and the nitrogen and phosphorus resource utilization algae culture unit are sequentially connected, and the nitrogen and phosphorus resource utilization algae culture unit is provided with an LED lighting system and a stirring device. The effluent oxygenation unit is connected with the nitrogen and phosphorus resource utilization algae culture unit and is provided with a stepped oxygenation device. According to the device, the carbon, nitrogen and phosphorus treatment of the fishpond culture tail water is realized, and the effluent rich in microalgae flows back into the fishpond, so that the culture tail water is recycled, and the feed feeding is reduced. In addition, the equipment also has the advantages of high integration level, small occupied area, low investment cost, stable water outlet and the like.

Description

Technical Field

[0001] This utility model belongs to the field of fishpond aquaculture wastewater treatment technology, and more specifically relates to an algae cultivation device for aquaculture wastewater treatment and nitrogen and phosphorus resource utilization. Background Technology

[0002] Intensive aquaculture has developed rapidly in my country. The wastewater from fishponds contains large amounts of suspended solids, dissolved organic matter, nitrogen, and phosphorus, posing a significant impact on surrounding water resources and the ecological environment. In fishpond aquaculture, feed is frequently given, and some of this feed remains in the water uneaten. Even the ingested feed, after digestion by aquatic animals, is excreted into the water. The organic matter in the feed and excrement dissolves in the water, leading to eutrophication of the aquaculture water. Dissolved organic matter pollution manifests as an increase in the biochemical oxygen demand (BOD) of the water, while nitrogen and phosphorus pollution is reflected in their excessive levels.

[0003] Common technologies for treating aquaculture wastewater include physical, chemical, and biological methods. Traditional treatment methods typically suffer from drawbacks such as high construction and operating costs, poor water treatment efficiency, or unstable effluent quality. Furthermore, they lack the resource utilization of nutrients such as nitrogen and phosphorus.

[0004] In view of this, this utility model optimizes the biological treatment process and sets up an algae cultivation device to utilize nitrogen and phosphorus nutrients on the basis of existing biological wastewater treatment processes. This not only achieves more efficient purification of aquaculture wastewater, but also reduces feed input by supplementing natural bait, thus achieving efficient and economical treatment of fishpond aquaculture wastewater. Utility Model Content

[0005] To overcome the shortcomings of existing technologies and realize the recovery and resource utilization of nutrients such as nitrogen and phosphorus, this utility model provides an algae cultivation device for the treatment of aquaculture tailwater and the resource utilization of nitrogen and phosphorus. It optimizes the biological treatment process of organic matter, total nitrogen and total phosphorus in fishpond aquaculture tailwater, realizes the recovery and resource utilization of nutrients such as nitrogen and phosphorus, and forms an integrated device.

[0006] To solve the above-mentioned technical problems, the specific technical solution of this utility model is as follows: a fishery aquaculture tailwater treatment and nitrogen and phosphorus resource utilization algae cultivation device, which is equipped with a front-end biological treatment unit, a nitrogen and phosphorus resource utilization algae cultivation unit, an effluent oxygenation unit and a device chamber.

[0007] The front-end biological treatment unit is equipped with a first-tier biological treatment device and a second-tier biological treatment device. The first-tier biological treatment device, the second-tier biological treatment device, and the nitrogen and phosphorus resource utilization algae cultivation unit are connected in sequence. The effluent oxygenation unit is connected to the nitrogen and phosphorus resource utilization algae cultivation unit. The device chamber is connected to the first-tier biological treatment device and the second-tier biological treatment device respectively through a jet aeration device.

[0008] The first-tier biological treatment unit mainly treats aerobic wastewater.

[0009] The second-tier biological treatment unit mainly treats aquaculture wastewater using facultative anoxic methods.

[0010] The nitrogen and phosphorus resource utilization algae cultivation unit achieves resource utilization of nitrogen and phosphorus nutrition through efficient algae cultivation, and deeply purifies aquaculture wastewater;

[0011] The effluent oxygenation unit is used to oxygenate the treated aquaculture wastewater before it is discharged or enters the fishpond, thus realizing the recycling of aquaculture wastewater within the aquaculture environment.

[0012] Furthermore, the first-stage biological treatment device of the front-end biological treatment unit has a cage-like cross-linked three-dimensional network structure inside the box. The structure is filled with microbial filter media, and a jet aeration device is laid at the bottom. The jet aeration device is connected to the oxygenation aerator in the device chamber. The fishpond aquaculture wastewater in the structure overflows into the second-stage biological treatment device after being oxygenated by the oxygenation aerator in the device chamber for further purification.

[0013] Furthermore, the second-tier biological treatment device of the front-end biological treatment unit is a cage-like cross-linked three-dimensional network structure, which is filled with microbial filter media. The inlet end of the structure is connected to the outlet end of the first-tier biological treatment device through a connecting pipe. A flow regulating gate is provided on the connecting channel. A water distribution pipe and a jet aeration device are laid at the bottom of the structure. The jet aeration device is connected to the oxygenation aerator in the device chamber.

[0014] Furthermore, the nitrogen and phosphorus resource utilization algae cultivation unit consists of a front-end sedimentation tank and an algae cultivation device. The front-end sedimentation tank is connected to the second-stage biological treatment device. The algae cultivation device is equipped with an LED lighting system, a stirring device, valves, a drain pipe, and a heating system. The algae cultivation device is connected to the effluent oxygenation unit through the drain pipe.

[0015] Furthermore, the effluent oxygenation unit consists of a stepped oxygenation device, and the effluent is oxygenated by the stepped flow system before being discharged or re-entered into the fishpond.

[0016] The beneficial effects of this utility model are:

[0017] One advantage of this utility model is that the front-end biological treatment unit provides a first-tier biological treatment device that integrates fish fry breeding and aquaculture wastewater treatment. The first-tier biological treatment device has a cage-like cross-linked three-dimensional network structure inside the box. The structure is filled with microbial filter media and has a jet aeration device at the bottom. The jet aeration device is connected to the oxygenation aerator in the device chamber. The fishpond aquaculture wastewater in the structure overflows into the second-tier biological treatment device after treatment. The first-tier biological treatment device performs aerobic treatment on the aquaculture wastewater in the in-situ environment of the fishpond, realizing the ammonification and ammonia oxidation of organic nitrogen in the aquaculture wastewater, adsorbing and degrading the biologically decomposable organic matter in the wastewater. Based on the fishpond aquaculture mode and the characteristics of aquaculture water quality, the high integration makes full use of the existing conditions of the fishpond and solves the problems of large equipment footprint and high construction and operation costs in the prior art.

[0018] One advantage of this invention is that the wastewater after aerobic treatment overflows into the second-stage biological treatment device of the front-end biological treatment unit. The second-stage biological treatment device is a cage-like cross-linked three-dimensional network structure. The inlet end of the structure is connected to the outlet end of the first-stage biological treatment device through a connecting pipe. A flow regulating gate is set on the connecting channel for flow control and distribution. The structure is filled with microbial filter media for facultative anaerobic treatment of the purified aquaculture wastewater. After the wastewater enters the cage-like cross-linked three-dimensional network structure, the microbial filter media can reduce nitrate nitrogen in the water to nitrogen gas, and at the same time decompose and convert organic matter into water and carbon dioxide. In the wastewater treatment process, there is no need to add an additional carbon source, no need for internal or external reflux, and the microorganisms on the microbial filter media are easy to attach and detach, have strong resistance to shock loads, and produce little residual sludge, making it energy-saving and efficient.

[0019] One advantage of this invention is that the nitrogen and phosphorus resource utilization algae cultivation unit consists of a front-end sedimentation tank and an algae cultivation device. The front-end sedimentation tank is connected to a second-stage biological treatment device. Wastewater treated with facultative anoxic methods flows into the front-end sedimentation tank to remove suspended solids and adjust water quality and quantity. It then flows into the algae cultivation device, where algae absorb and transform the residual nitrogen and phosphorus in the aquaculture wastewater. The algae cultivation device includes an LED lighting system, a stirring device, valves, a drainage pipe, and a heating system. The stirring device has stirring blades to maintain a circulation velocity of 0.5 m / s. The LED lighting system consists of multiple LED tubes arranged side-by-side. LEDs are selective and inexpensive light sources that can provide suitable light for algae growth. The system is set to a light phase:dark phase ratio of 2:1 to provide light to the algae, with a daily lighting time of 12 hours, i.e., an effective lighting time of 8 hours. h, the valve is used to supply O2 and CO2 for algae growth, the drain pipe is connected to the effluent oxygenation unit, the heating system is composed of high-quality steel pipes, and the heat provided is only used to maintain the algae cultivation device at a suitable temperature for algae growth. The nitrogen and phosphorus resource utilization algae cultivation unit fully converts the nitrogen and phosphorus in the wastewater into nutrients required for algae growth, solving the problem of ineffective consumption of nitrogen and phosphorus nutrients, realizing nitrogen and phosphorus treatment of fishpond aquaculture tailwater, and the effluent rich in microalgae is returned to the fishpond, reducing feed feeding and realizing the recycling of aquaculture tailwater.

[0020] One advantage of this invention is that the outlet aeration unit is equipped with a stepped aeration device. During the cascading process, water and air come into full contact, and a large amount of oxygen in the air dissolves into the water. The outlet water is aerated by the stepped aeration device and then discharged or flows back into the fishpond. Compared with some equipment that requires additional energy to drive, the stepped aeration device uses the gravitational potential energy of water to generate a cascading effect, reducing complex mechanical parts and electrical equipment. This makes the installation and maintenance of the stepped aeration device more convenient, less prone to failure, extends its service life, and reduces maintenance costs. Attached Figure Description

[0021] Appendix Figure 1 This is a schematic diagram of the structure of this utility model; in the attached drawing:

[0022] 1. First-stage biological treatment unit; 2. Outlet end; 3. Valve; 4. Inlet end; 5. Second-stage biological treatment unit; 6. Jet aeration device; 7. Nitrogen and phosphorus resource utilization algae cultivation unit; 8. Front-end sedimentation tank; 9. Algae cultivation device; 10. LED lighting system; 11. Stirring device; 12. Drainage pipe; 13. Outlet oxygenation unit; 14. Heating system; 15. Equipment room. Detailed Implementation

[0023] In the description of this utility model, the terms "front end," "inner," "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model. In addition, the terms "first echelon," "second echelon," etc., are only used to describe the classification and order, and should not be construed as indicating or implying relative importance.

[0024] The specific embodiments of this utility model are as follows: The algae cultivation device for treating aquaculture tailwater and utilizing nitrogen and phosphorus resources is described in detail below with reference to the accompanying drawings.

[0025] like Figure 1 As shown, the aquaculture wastewater treatment and nitrogen and phosphorus resource utilization algae cultivation device of this utility model includes: a front-end biological treatment unit, a nitrogen and phosphorus resource utilization algae cultivation unit 7, an effluent oxygenation unit 13, and a device chamber 15.

[0026] The front-end biological treatment unit is equipped with a first-stage biological treatment device 1 and a second-stage biological treatment device 5. The first-stage biological treatment device 1, the second-stage biological treatment device 5 and the nitrogen and phosphorus resource utilization algae cultivation unit 7 are connected in sequence. The effluent oxygenation unit 13 is connected to the nitrogen and phosphorus resource utilization algae cultivation unit 7. The device chamber 15 is connected to the first-stage biological treatment device 1 and the second-stage biological treatment device 5 respectively through the jet aeration device 6.

[0027] The front-end biological treatment unit of this utility model provides a first-stage biological treatment device 1 with a cage-like cross-linked three-dimensional network structure inside, which is filled with microbial filter media; a jet aeration device 6 is laid at the bottom of the cage-like cross-linked three-dimensional network structure, and the jet aeration device 6 is connected to the oxygenation aerator in the device chamber 15; the fish pond aquaculture wastewater in the cage-like cross-linked three-dimensional network structure overflows from the outlet 2 into the second-stage biological treatment device 5 after treatment.

[0028] The front-end biological treatment unit of this utility model provides a two-tier biological treatment device 5, which is a cage-like cross-linked three-dimensional network structure filled with microbial filter media. The inlet 4 of the structure is connected to the outlet 2 of the first-tier biological treatment device 1 through a connecting pipe. In order to accurately adjust the flow rate, a flow regulating valve 3 is provided on the connecting pipe between the two-tier biological treatment device 5 and the outlet 2 of the first-tier biological treatment device 1. The valve 3 can be a butterfly valve or a ball valve. The bottom of the cage-like cross-linked three-dimensional network structure is provided with a water distribution pipe and a jet aeration device 6, which is connected to the oxygenation aerator of the device chamber 15.

[0029] The nitrogen and phosphorus resource utilization algae cultivation unit 7 of this utility model consists of a front-end sedimentation tank 8 and an algae cultivation device 9. The front-end sedimentation tank 8 is connected to the second-stage biological treatment device 5. The algae cultivation device 9 is equipped with an LED lighting system 10, a stirring device 11, a valve 3, a drain pipe 12, and a heating system 14. The drain pipe 12 is connected to the effluent oxygenation unit 13. The heating system 14 is composed of high-quality steel pipes. The algae cultivation device 9 is connected to the effluent oxygenation unit 13 through the drain pipe 12.

[0030] The water outlet oxygenation unit 13 of this utility model is composed of a stepped oxygenation device. The water outlet is oxygenated by the stepped water flow facility and then discharged or re-entered into the fish pond.

[0031] It should be noted that this utility model is a fishery aquaculture wastewater treatment and nitrogen and phosphorus resource utilization algae cultivation device. In specific operation, the microbial filter media in the first-stage biological treatment device 1 box of the front-end biological treatment unit aerobically treats the aquaculture wastewater to be treated in the in-situ environment of the fish pond, and performs biochemical treatment on the organic nitrogen in the aquaculture wastewater, adsorbing and degrading the easily biodegradable organic matter in the wastewater, thus completing the first step of purification.

[0032] After aerobic treatment, the aquaculture wastewater overflows from the outlet 2 into the second-stage biological treatment device 5 set in the front-end biological treatment unit. The second-stage biological treatment device 5 is a cage-like cross-linked three-dimensional network structure, which is filled with microbial filter media. It can further treat the purified aquaculture wastewater, causing nitrate nitrogen to undergo a reduction reaction and decomposing organic pollutants, thus completing the second step of facultative anaerobic treatment.

[0033] The wastewater treated with facultative anoxic methods flows into the nitrogen and phosphorus resource utilization algae cultivation unit 7. This unit consists of a front-end sedimentation tank 8 and an algae cultivation device 9. The front-end sedimentation tank 8 is connected to the second-stage biological treatment device 5. The wastewater, after facultative anoxic treatment, flows into the nitrogen and phosphorus resource utilization algae cultivation unit 7. The front-end sedimentation tank 8 performs sedimentation, intercepting and removing suspended solids. The aquaculture wastewater from the front-end sedimentation tank 8 flows from the top into the algae cultivation device 9. The algae cultivation device 9 is equipped with an LED lighting system 10, a stirring device 11, valves 3, a drain pipe 12, and a heating system 14. The LED lighting system 10 consists of multiple LED tubes arranged side-by-side, providing a suitable light source for algae growth. It is set to a light phase:dark phase ratio of 2:1 to provide light to the algae, with a daily lighting time of 12 hours, i.e., an effective lighting time of 8 hours. h, the light emitted by the LED tube can be absorbed by the photosynthetic pigments of algae. After absorbing the light energy, the algae convert the light energy into chemical energy, which is used in the light reaction stage of photosynthesis to provide matter and energy for their own growth, reproduction and other life activities. The stirring device 11 makes the algae more evenly distributed, ensuring that the algal cells have the opportunity to fully receive light, so that they can absorb light energy more efficiently and grow better. The valve 3 is used to supply O2 and CO2 for algal growth. During respiration, algae use O2 to decompose organic matter stored in their bodies, releasing energy for growth, reproduction and other activities. CO2 provides a carbon source for algal growth, participates in the dark reaction, undergoes Calvin cycle fixation, is converted into organic compounds, and then stores energy, providing the material and energy basis for various physiological activities of algae. The heating system 14 provides a suitable temperature for algal growth, enabling algae to grow and reproduce rapidly and with high quality. The algae absorb and convert residual nitrogen and phosphorus in the aquaculture wastewater, completing the final purification step, realizing nitrogen and phosphorus treatment of fishpond aquaculture tailwater. The effluent is rich in microalgae and flows back into the fishpond to realize the recycling of aquaculture tailwater, and also reduces the feeding of feed.

[0034] Water treated by the nitrogen and phosphorus resource utilization algae cultivation unit 7 flows out through the stepped aeration facility of the effluent aeration unit 13, allowing the wastewater to fall from a height. In this process, the contact area between the water and the air is increased, the dissolved oxygen content in the water is increased, and the water quality is improved. The water is then discharged from the outlet or returned to the fishpond.

[0035] The aquaculture wastewater, after being treated by the aquaculture tailwater treatment and nitrogen and phosphorus resource utilization algae cultivation device of this utility model, can be directly returned to the fishpond to achieve the recycling of aquaculture tailwater. This utility model is based on the fishpond aquaculture model and existing algae cultivation devices, making full use of the existing conditions of the fishpond, innovating the existing biological wastewater treatment process, optimizing the structure of the biological treatment device and setting up an algae cultivation device to achieve resource utilization of nitrogen and phosphorus nutrition. Compared to existing biological wastewater treatment processes, this method offers the following advantages in wastewater treatment: First, it eliminates the need for additional carbon sources, internal and external recirculation, resulting in energy efficiency and high performance. Second, the microbial filter media facilitates microbial biofilm formation and detachment, exhibits strong resistance to shock loads, and produces minimal residual sludge. Third, the dissolved oxygen content in the effluent significantly increases after treatment by a stepped aeration device. Fourth, the algae cultivation device utilizes nitrogen and phosphorus nutrients efficiently, enabling highly efficient algae cultivation. Furthermore, the equipment boasts high integration, a small footprint, and low construction and operating costs, eliminating the complex installation procedures for each stage of the process. This not only enables more efficient purification of aquaculture wastewater but also reduces feed input by supplementing with natural bait, achieving efficient and economical treatment of fishpond aquaculture wastewater.

[0036] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any modifications, equivalent substitutions and improvements made by those skilled in the art within the technical scope disclosed in this utility model, and within the spirit and principles of this utility model, should be included within the protection scope of this utility model.

Claims

1. A device for treating aquaculture wastewater and cultivating algae for nitrogen and phosphorus resource utilization, comprising a front-end biological treatment unit, a nitrogen and phosphorus resource utilization algae cultivation unit (7), an effluent aeration unit (13), and a device chamber (15); characterized in that: The front-end biological treatment unit consists of a first-tier biological treatment device (1) and a second-tier biological treatment device (5); the first-tier biological treatment device (1), the second-tier biological treatment device (5), the nitrogen and phosphorus resource utilization algae cultivation unit (7), and the effluent oxygenation unit (13) are connected in sequence, and the device chamber (15) is connected to the first-tier biological treatment device (1) and the second-tier biological treatment device (5) respectively through a jet aeration device (6); the first-tier biological treatment device (1) is used for aerobic treatment of aquaculture wastewater; the second-tier biological treatment device (5) is used for facultative treatment of aquaculture wastewater; the nitrogen and phosphorus resource utilization algae cultivation unit (7) is used for further treatment of the effluent from the biological treatment plate by efficiently cultivating algae; the effluent oxygenation unit (13) is used to oxygenate the treated aquaculture wastewater before discharge or enter the fishpond to realize the recycling of aquaculture wastewater in the aquaculture environment.

2. The aquaculture wastewater treatment and nitrogen and phosphorus resource utilization algae cultivation device as described in claim 1, characterized in that, The first-tier biological treatment device (1) has a cage-like cross-linked three-dimensional network structure inside the box, which is filled with microbial filter media. A jet aeration device (6) is provided at the bottom. The treated effluent overflows into the second-tier biological treatment device (5).

3. The aquaculture wastewater treatment and nitrogen and phosphorus resource utilization algae cultivation device as described in claim 1, characterized in that, The second-tier biological treatment device (5) is a cage-like cross-linked three-dimensional network structure, filled with microbial filter media. The inlet end (4) is connected to the outlet end (2) of the first-tier biological treatment device (1) through a connecting pipe. A flow regulating valve (3) is installed on the connecting pipe. A water distribution pipe and a jet aeration device (6) are laid at the bottom of the structure. The jet aeration device (6) is connected to the oxygenation aerator in the device chamber (15).

4. The aquaculture wastewater treatment and nitrogen and phosphorus resource utilization algae cultivation device as described in claim 1, characterized in that, The nitrogen and phosphorus resource utilization algae cultivation unit (7) consists of a front-end sedimentation tank (8) and an algae cultivation device (9). The front-end sedimentation tank (8) is connected to the second-stage biological treatment device (5). The algae cultivation device (9) contains an LED lighting system (10), a stirring device (11), a valve (3), a drain pipe (12), and a heating system (14). The algae cultivation device (9) is connected to the effluent oxygenation unit (13) through the drain pipe (12).

5. The aquaculture wastewater treatment and nitrogen and phosphorus resource utilization algae cultivation device as described in claim 1, characterized in that, The effluent oxygenation unit (13) consists of a stepped oxygenation device. The effluent is oxygenated by the stepped flow system and then discharged or re-enters the fishpond.

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