Aquaculture wastewater treatment system with phycomycete wind screen biofilm

Abstract

The utility model relates to a phycomycete wind screen biological membrane aquaculture wastewater treatment system which consists of a purification device, a collection device, a spraying device and a circulating device, wherein the purification device consists of a supporting steel frame, a microalgae biological membrane, a first biological filter bed and a second biological filter bed; the collecting device is composed of a first collecting pool and a second collecting pool; the spraying device is composed of a first spraying piece and a second spraying piece. Through the combined action of the biological filter bed, the microalgae biological membrane, the collecting pool and the like, the aquaculture wastewater treatment effect can be improved, low-cost microalgae cell harvesting can be carried out, and the problems that in a traditional aquaculture wastewater treatment technology, the process is complex, the nitrogen and phosphorus pollutant removal efficiency is low, and microalgae cells are difficult to harvest in wastewater treatment are solved; meanwhile, after absorbing nitrogen and phosphorus, the microalgae are converted into high-added-value biomass rich in protein and the like to serve as aquatic feed and bio-fertilizer, so that the economic benefit is increased, and resource recycling of the aquaculture wastewater is fully realized.

Description

Technical Field

[0001] This utility model relates to an algae and bacteria wind screen biofilm aquaculture wastewater treatment system, specifically belonging to the field of aquaculture wastewater treatment technology. Background Technology

[0002] The rapid development of aquaculture has also brought about the problem of environmental pollution from aquaculture wastewater. Traditional aquaculture wastewater treatment technologies, such as activated sludge process, pond purification and constructed wetlands, often have problems such as complex processes, large land area, long treatment time, high aeration energy consumption, difficulty in treating residual sludge, large carbon dioxide emissions, and high construction costs. At the same time, due to the low carbon-nitrogen ratio of aquaculture wastewater, these methods have low efficiency in treating nitrogen and phosphorus pollutants in wastewater.

[0003] Microalgae wastewater treatment is an emerging technology developed in recent decades, boasting advantages such as simple operation, low cost, and good treatment effect. The microalgae treatment process does not require extensive aeration, significantly reducing energy consumption; microalgae photosynthesis consumes CO2, achieving carbon emission reduction; and microalgae growth efficiently absorbs nitrogen and phosphorus nutrients from wastewater, converting them into biomass and intracellular proteins, nucleic acids, and other components, fully realizing the resource recycling of wastewater. However, algal cell harvesting remains a limiting factor in microalgae wastewater treatment, as common methods such as filtration, centrifugation, and flocculation generally suffer from high costs and energy consumption.

[0004] Microalgal biofilms are formed by attaching microalgal cells to a membrane carrier for growth. They absorb nutrients through contact with water and have great potential in wastewater treatment. Unlike suspension culture, algal cells on the membrane can be harvested simply by mechanical scraping, reducing harvesting costs.

[0005] To achieve resource recycling and efficient removal of pollutants from aquaculture wastewater, and to solve the problems of difficult and costly microalgae cell harvesting in wastewater treatment, this utility model designs an algae-bacterial wind screen biofilm aquaculture wastewater treatment system that combines traditional biological (bacterial) treatment methods with microalgae biofilm technology to achieve deep purification of aquaculture wastewater and low-cost harvesting of microalgae. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and to design an algae-bacterial wind screen biofilm aquaculture wastewater treatment system.

[0007] This utility model discloses an algae and bacteria wind screen biofilm aquaculture wastewater treatment system, which consists of a purification device, a collection device, a spraying device, and a circulation device.

[0008] The purification device consists of an algae and bacteria wind screen biofilm and a biofilter bed; wherein, the algae and bacteria wind screen biofilm includes a supporting steel frame (1) and a microalgae biofilm (2), and the biofilter bed includes a first biofilter bed (3) and a second biofilter bed (4); the microalgae biofilm (2) is vertically and side by side supported on the supporting steel frame (1); a first collection tank inlet pipe (14) is set above the first biofilter bed (3).

[0009] The collection device consists of a first collection tank (5) and a second collection tank (6). The first collection tank (5) is located directly below the first biological filter bed (3), and the second collection tank (6) is located directly below the second biological filter bed (4). The second collection tank (6) is provided with an outlet.

[0010] The spraying device consists of a first spraying element (7) and a second spraying element (8); wherein the spraying ends of the first spraying element (7) and the second spraying element (8) are located above the microalgae biofilm (2);

[0011] The circulation device consists of a No. 1 lift pump (9), a No. 2 lift pump (10), a No. 3 lift pump (11), and a No. 4 lift pump (12); wherein, the No. 1 lift pump (9) is connected to the first spray element (7) through a pipe, the No. 3 lift pump (11) is connected to the second spray element (8) through a pipe, the No. 2 lift pump (10) is connected to the first collection tank (5) and the second collection tank (6) through a pipe; and the No. 4 lift pump (12) is connected to the outlet of the second collection tank (6) through a pipe.

[0012] The height of the algae-bacterial wind screen biofilm is 5 m.

[0013] The microalgae biofilm (2) is 2 mm thick and is supported vertically on the support steel frame (1) in a number of 10-50.

[0014] The filter media of the first biological filter bed (3) is crushed straw or rice husks, with a thickness of 20-30 cm; wherein the particle size of the crushed straw is 0.5-1 cm.

[0015] The filter media of the second biological filter bed (4) is ceramsite or gravel, with a thickness of 10-15 cm; wherein the particle size of the ceramsite is 1.0-1.5 cm and the particle size of the gravel is 0.3-0.6 cm.

[0016] The bottom of the first collection tank (5) is evenly equipped with aeration pipes (13), and the filling amount of K5 packing is 12 kg / m³. 3 .

[0017] The spray ends of the first spray element (7) and the second spray element (8) are provided with 15-30 evenly distributed spray heads.

[0018] The first collection tank (5) inlet pipe (14) and the second collection tank (6) inlet pipe (15) have T-shaped outlet ends. The T-shaped pipe wall is provided with 20-40 circular drainage holes with a diameter of 0.15-0.4 cm.

[0019] The beneficial effects of this utility model are as follows:

[0020] This utility model discloses an algae-bacterial wind screen biofilm aquaculture wastewater treatment system that cleverly combines traditional biological (bacterial) treatment methods with microalgae wastewater treatment technology. The system saves a lot of space by arranging the components vertically. The system is simple in structure, easy to operate, and has low energy consumption.

[0021] This novel aquaculture wastewater treatment system enhances the removal of nitrogen and phosphorus pollutants from aquaculture wastewater through nitrification and denitrification by bacteria and microorganisms, and assimilation and absorption by microalgae. The wastewater first passes through a biological filter bed to remove suspended particles before entering the first collection tank. Bacteria and microorganisms in the filter bed and collection tank decompose and transform organic matter and ammonia nitrogen in the wastewater, while the microalgae biofilm further absorbs and utilizes the remaining nitrogen and phosphorus nutrients. The wastewater then enters the second collection tank for further recycling. Deep purification of aquaculture wastewater is achieved through the synergistic metabolism of algae and bacteria and the two-stage recycling process.

[0022] The biomass on the microalgae biofilm of this wastewater treatment system can be easily harvested by scraping the surface of the membrane with a scraper, which greatly reduces the harvesting cost of algae cells in wastewater. The microalgae convert nitrogen and phosphorus nutrients in wastewater into protein-rich biomass, which can be used for aquaculture feed and bio-fertilizer, etc., increasing additional economic benefits and realizing the recycling of aquaculture wastewater. Attached Figure Description

[0023] Figure 1 This utility model discloses a front view of an algae and bacteria wind screen biofilm aquaculture wastewater treatment system.

[0024] Figure 2 This utility model discloses a top view of an algae-bacterial wind screen biofilm aquaculture wastewater treatment system.

[0025] Figure 3 This utility model Figure 1 Top view of the first and second collection pools;

[0026] Figure 4 This utility model Figure 1 Schematic diagram of the inlet pipe structure of the first and second collection tanks;

[0027] In the diagram: 1. Supporting steel frame; 2. Microalgae biofilm; 3. First biological filter bed; 4. Second biological filter bed; 5. First collection tank; 6. Second collection tank; 7. First spray unit; 8. Second spray unit; 9. No. 1 lift pump; 10. No. 2 lift pump; 11. No. 3 lift pump; 12. No. 4 lift pump; 13. Aeration pipe; 14. Inlet pipe of the first collection tank; 15. Inlet pipe of the second collection tank. Detailed Implementation

[0028] The embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Example 1

[0030] like Figures 1-4 As shown, the present invention provides a wastewater treatment system for aquaculture using algae and bacteria-based biofilm screens, comprising a purification device, a collection device, a spraying device, and a circulation device.

[0031] like Figure 1 As shown, the purification device consists of an algae-bacterial air screen biofilm and a biofilter bed. The algae-bacterial air screen biofilm includes a supporting steel frame 1 and a microalgae biofilm 2. The algae-bacterial air screen biofilm is 5 m high, and the microalgae biofilm 2 is 2 mm thick. There are 30 of them, which are vertically arranged side by side on the supporting steel frame. A certain interval is left between any adjacent microalgae biofilms to allow for sunlight exposure, air circulation, and wastewater to flow downwards along the membrane. The interval is set at 0.15 m. The algae-bacterial air screen biofilm treats aquaculture wastewater and diverts the wastewater to the biofilter bed.

[0032] The biological filter bed consists of a first biological filter bed 3 and a second biological filter bed 4. The filter media of the first biological filter bed 3 is composed of crushed straw and rice husks, with a thickness of 25 cm and a particle size of 0.5-1 cm for the crushed straw. The filter media of the second biological filter bed 4 is composed of ceramsite and gravel, with a thickness of 12 cm and a particle size of 1.0-1.5 cm for the ceramsite and 0.3-0.6 cm for the gravel. After the wastewater is filtered and biochemically treated by the biological filter bed, it flows into the collection tank.

[0033] like Figure 2 As shown, the collection device consists of a first collection tank 5 and a second collection tank 6. The first collection tank 5 is equipped with a No. 1 lift pump 9 and a No. 2 lift pump 10, while the second collection tank 6 is equipped with a No. 3 lift pump 11 and a No. 4 lift pump 12. Aeration pipes 13 are evenly distributed at the bottom of the first collection tank 5 for intermittent aeration, controlling the dissolved oxygen content in the first collection tank 5 to approximately 0.5 mg / L, thus promoting simultaneous nitrification and denitrification reactions in the wastewater. Simultaneously, K5 packing material is added to the first collection tank 5 to promote the attachment and growth of nitrifying and denitrifying bacteria, with a packing volume of 12 kg / m³.3 The second collection tank 6 is not equipped with aeration or packing material.

[0034] The spraying device consists of a first spraying element 7 and a second spraying element 8. The spraying end of the first spraying element 7 is connected to the No. 1 lifting pump 9 and the first collection tank 5 through a pipe. The spraying end of the second spraying element 8 is connected to the No. 3 lifting pump 11 and the second collection tank 6 through a pipe.

[0035] The circulation device consists of a No. 1 lift pump 9 and a No. 2 lift pump 10 in the first collection tank 5 and a No. 3 lift pump 11 and a No. 4 lift pump 12 in the second collection tank 6. The No. 1 lift pump 9 and the No. 3 lift pump 11 are connected to the first spray element 7 and the second spray element 8 through pipes, respectively, and the No. 2 lift pump 10 is connected to the water inlet pipe of the second collection tank 6.

[0036] like Figure 4 As shown, the water outlet ends of the first collection tank inlet pipe 14 of the first collection tank 5 and the second collection tank inlet pipe 15 of the second collection tank 6 are both T-shaped structures. The T-shaped pipe wall is provided with 30 circular drainage holes with a diameter of 0.25 cm.

[0037] Example 2

[0038] The operation of this utility model's algae-bacterial wind-screen biofilm aquaculture wastewater treatment system includes the following steps:

[0039] Step 1: Primary biological treatment; Aquaculture wastewater first passes through the first biological filter bed 3 to filter suspended particles. At the same time, bacteria and microorganisms attached to the filter media decompose organic matter. The wastewater then enters the first collection tank 5 for anoxic simultaneous nitrification and denitrification to remove ammonia nitrogen and nitrate nitrogen. It then reaches the algae-bacterial wind screen biofilm above the No. 1 lift pump 9 and is sprayed onto the microalgae biofilm 2 through the first spray element 7 for treatment. The microalgae further remove nitrogen and phosphorus nutrients from the wastewater through assimilation and absorption. The wastewater flows along the microalgae biofilm into the first biological filter bed 3 and the first collection tank 5 for recycling.

[0040] Step Two: Secondary Biological Treatment; After primary biological treatment, the wastewater in the first collection tank 5 is filtered through the second biological filter bed 4 by pump No. 2 (lift pump 10) and then enters the second collection tank 6. It is then pumped by pump No. 3 (lift pump 11) to the top of the algae-bacterial wind screen biofilm, where it is sprayed onto the microalgae biofilm 2 by the second spray nozzle 8 for further treatment. The wastewater then flows along the microalgae biofilm into the second biological filter bed 4 and the second collection tank 6 for circulation. Finally, it is discharged through pump No. 4 (lift pump 12). Through continuous circulation, deep purification of aquaculture wastewater is ultimately achieved.

Claims

1. A biofilm-based aquaculture wastewater treatment system with algae and bacteria screens, characterized in that: The wastewater treatment system consists of a purification device, a collection device, a spraying device, and a circulation device; The purification device consists of an algae and bacteria wind screen biofilm and a biofilter bed; wherein, the algae and bacteria wind screen biofilm includes a supporting steel frame (1) and a microalgae biofilm (2), and the biofilter bed includes a first biofilter bed (3) and a second biofilter bed (4); the microalgae biofilm (2) is vertically and side by side supported on the supporting steel frame (1); a first collection tank inlet pipe (14) is set above the first biofilter bed (3). The collection device consists of a first collection tank (5) and a second collection tank (6). The first collection tank (5) is located directly below the first biological filter bed (3), and the second collection tank (6) is located directly below the second biological filter bed (4). The second collection tank (6) is provided with an outlet. The spraying device consists of a first spraying element (7) and a second spraying element (8); wherein the spraying ends of the first spraying element (7) and the second spraying element (8) are located above the microalgae biofilm (2); The circulation device consists of a No. 1 lift pump (9), a No. 2 lift pump (10), a No. 3 lift pump (11), and a No. 4 lift pump (12); wherein, the No. 1 lift pump (9) is connected to the first spray element (7) through a pipe, the No. 3 lift pump (11) is connected to the second spray element (8) through a pipe, the No. 2 lift pump (10) is connected to the first collection tank (5) and the second collection tank (6) through a pipe; and the No. 4 lift pump (12) is connected to the outlet of the second collection tank (6) through a pipe.

2. The aquaculture wastewater treatment system with algae and bacteria wind-screen biofilm as described in claim 1, characterized in that: The height of the algae-bacterial wind screen biofilm is 5 m.

3. The aquaculture wastewater treatment system with algae and bacteria wind-screen biofilm as described in claim 1, characterized in that: The microalgae biofilm (2) is 2 mm thick and is supported vertically on the support steel frame (1) in a number of 10-50.

4. The aquaculture wastewater treatment system with algae and bacteria wind-screen biofilm according to claim 1, characterized in that: The filter media of the first biological filter bed (3) is crushed straw or rice husks, with a thickness of 20-30 cm; wherein the particle size of the crushed straw is 0.5-1 cm.

5. The aquaculture wastewater treatment system with algae and bacteria wind-screen biofilm according to claim 1, characterized in that: The filter media of the second biological filter bed (4) is ceramsite or gravel, with a thickness of 10-15 cm; wherein the particle size of the ceramsite is 1.0-1.5 cm and the particle size of the gravel is 0.3-0.6 cm.

6. The aquaculture wastewater treatment system with algae and bacteria wind-screen biofilm according to claim 1, characterized in that: The bottom of the first collection tank (5) is evenly equipped with aeration pipes (13), and the filling amount of K5 packing is 12 kg / m³. 3 .

7. The aquaculture wastewater treatment system with algae and bacteria wind-screen biofilm according to claim 1, characterized in that: The spray ends of the first spray element (7) and the second spray element (8) are provided with 15-30 evenly distributed spray heads.

8. The aquaculture wastewater treatment system with algae and bacteria wind-screen biofilm according to claim 1, characterized in that: The outlet ends of the first collection pool inlet pipe (14) and the second collection pool inlet pipe (15) are both T-shaped structures. The T-shaped pipe wall is provided with 20-40 circular drainage holes with a diameter of 0.15-0.4 cm.

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