Integrated equipment and treatment method for industrial seawater aquaculture tail water treatment

Abstract

The present invention relates to the field of seawater aquaculture tailwater treatment, and more particularly to an integrated device and treatment method for industrial seawater aquaculture tailwater treatment. The recycling route of the present invention is used for regular and quantitative purification and disinfection of aquaculture tailwater, removal of water biological toxicity, and after addition of fresh water, recycling to aquaculture ponds for reuse, maintaining the pH and salinity of the aquaculture water and removing harmful microorganisms. The purification and discharge route of the present invention is used for regular and quantitative renewal of aquaculture tailwater, and after undergoing processes such as A / O biochemical treatment, biological purification tanks, ozone disinfection, aeration and oxygenation, and ultraviolet disinfection, the tailwater is discharged after meeting the discharge standards. The average contact angle of the modified biofilm prepared by the present invention is 35 degrees, which is conducive to the adhesion of microorganisms. The integrated device and treatment method for industrial seawater aquaculture tailwater treatment of the present invention have a suspended matter removal rate of 95%, a COD removal rate of 92%, and a total nitrogen removal rate of 91%.

Description

Technical Field

[0001] The present invention relates to the field of seawater aquaculture tail water treatment, and in particular to an integrated device and a treatment method for industrial seawater aquaculture tail water treatment. Background Art

[0002] my country is a major player in marine aquaculture. In 2019, the country's marine aquaculture area reached 1,992,180 hectares, producing 20.6533 million tons, accounting for 62.92% of the nation's total marine product output, with a total output value of 357.529 billion yuan. Marine aquaculture has played a vital role in driving the development of the fishery economy, ensuring the supply of high-quality protein, and increasing fishermen's incomes. At the same time, with the rapid development of the marine aquaculture industry and the continuous increase in aquaculture density, the environmental impacts of aquaculture tailwater are attracting increasing attention. Currently, my country's marine aquaculture model remains relatively traditional, mostly open and extensive, with low levels of facility development and intensification. This leads to the direct discharge of untreated or substandard aquaculture tailwater. Because aquaculture tailwater contains large amounts of organic matter such as leftover bait and feces, its indiscriminate discharge has had a negative impact on the surrounding waters. The lack of treatment of aquaculture tailwater has, to a certain extent, hindered the healthy and green development of the marine aquaculture industry.

[0003] Chinese Patent CN202310162964.5: An SBR treatment method for marine aquaculture tail water has been applied for, comprising the following steps: loading activated sludge into an SBR reactor; introducing simulated marine aquaculture tail water into the reactor, subjecting it to anaerobically treatment for 5-7 hours, aeration treatment for 1-2 hours, sedimentation, and discharge of the treated tail water, repeating the above anaerobic-aerobic process multiple times until the reactor has been in operation for 70-80 days; introducing simulated marine aquaculture tail water into the reactor, subjecting it to anaerobically sedimentation treatment for 7-8 hours, discharge of the treated tail water, and repeating the above complete anaerobic process multiple times until the reactor has been in operation for 120-125 days; introducing marine aquaculture tail water into the reactor, subjecting it to anaerobically sedimentation treatment for 7-8 hours, discharge of the treated tail water, and repeating the above anaerobic process multiple times until the treatment of the marine aquaculture tail water is completed.

[0004] Chinese Patent CN202310271898.5: An application is made for a seawater aquaculture tailwater treatment device and method, which includes a seawater aquaculture pond and a purification box. A first baffle, a second baffle, and a third baffle are sequentially arranged in the purification box along the flow direction of the waste liquid. The first baffle, the second baffle, and the third baffle separate the interior of the purification box into a sedimentation area, a filtration area, an aerobic area, and an anaerobic area. The sedimentation area is connected to the outlet end of the seawater aquaculture pond, and the outlet end of the anaerobic area is connected to the seawater aquaculture pond through a return pipe to circulate the purified waste liquid to the seawater aquaculture pond.

[0005] Chinese patent CN202310054898.X: A method and apparatus for treating tailwater from industrialized seawater aquaculture on land, involving the field of aquaculture tailwater treatment, is applied for. The method and apparatus for treating tailwater from industrialized seawater aquaculture on land, including an aquaculture pond, a drainage channel, a vertical sedimentation tank, an aeration tank, and a biological treatment tank, are disclosed. The drainage channel is provided with a primary filtration mechanism comprising a biological filter membrane and a baffle. The vertical sedimentation tank is provided with a water distribution assembly comprising a diffuser and a cone. The aeration tank is provided with an aeration mechanism comprising an aeration pipe and an aeration head.

[0006] At present, the effluent from factory-scale seawater aquaculture is mainly circulated and directly discharged; the effluent from seawater aquaculture contains the feces and leftover bait of farmed animals, producing a large amount of high-concentration organic matter and N, P nutrients, as well as antibiotics in the water body; the aquaculture effluent is directly discharged into the nearshore waters, which affects the ecological environment of the nearshore waters, easily causes eutrophication of the nearshore waters, and even leads to red tides. Summary of the Invention

[0007] The purpose of the present invention is to overcome the problem that the tail water of existing factory-based seawater aquaculture contains high concentrations of organic matter and N, P nutrients, as well as antibiotics, which affects the ecological environment of offshore waters, easily causes offshore eutrophication, and even leads to red tides.

[0008] The technical solution of the present invention is to adopt a recycling route for regular and quantitative purification and disinfection of aquaculture tail water, remove water biological toxicity, add fresh water, and circulate it to the aquaculture pond for reuse to maintain the pH and salinity of the aquaculture water and remove harmful microorganisms.

[0009] The specific technical solution of the present invention is as follows: an integrated device and treatment method for industrial seawater aquaculture tail water treatment, wherein the treatment method is:

[0010] Aquaculture tail water comes from 900m 3 turbot fish breeding ponds;

[0011] Recycling: Aquaculture tail water enters microfiltration and protein separation, and the flow rate is controlled at 100-150m 3 / h, after ozone disinfection, aeration and oxygenation tank, and ultraviolet disinfection, most of the organic matter, ammonia nitrogen and harmful microorganisms are removed, and then injected into the reuse water pool, which is circulated once every 5-7 hours, and 50-100m 3 / h fresh water;

[0012] Purification and discharge: according to the ratio of 10-15% of the aquaculture water discharged daily, 70-100m 3 It is discharged into the tailwater collection pool and becomes qualified water discharge after microfiltration, protein separation, A / O biochemical filter, sedimentation tank, biological purification tank, ozone disinfection, and aeration oxygenation tank.

[0013] In the present invention, the microfiltration width is 2m, filled with a fixed filter material layer; the particle sizes of the upper, middle and lower filter materials are 3-5cm, 5-8cm and 8-10cm respectively, and the height of each layer of filler is 50-70cm; the filter materials are pebbles, volcanic rocks and ceramsite.

[0014] In the present invention, the protein separation adopts a commercially available protein separator and a vortex pump to generate a large number of bubbles. These bubbles are all concentrated on the water surface to form foam. Impurities such as protein are all mixed and adsorbed on the foam. The foam is then collected and discharged to achieve the purpose of purifying aquaculture tail water.

[0015] In the present invention, the A / O biochemical filter is provided with an anoxic tank and an aerobic tank adjacent to each other, a partition is provided between the anoxic tank and the aerobic tank, and a water flow channel connecting the anoxic tank and the aerobic tank is provided on the partition; a first filler layer for absorbing anoxic microorganisms and a submersible mixer are provided in the anoxic tank; a second filler layer for absorbing aerobic microorganisms, an aeration device and a reflux device are provided in the aerobic tank;

[0016] In the present invention, the modified biofilm fillers with a fixed diameter of 120-150 mm are fixed in the anoxic tank and the aerobic tank, the center distance between the fillers is 80-150 mm, and the fillers are intertwined with each other so that the entire space in the tower is filled with the modified biofilm fillers, and each filler has a layer of 0.8-3 mm biofilm.

[0017] In the present invention, the sedimentation tank is 3m deep and is divided into three areas by partitions. The tail water in each area overflows from the top to the next area. The bottom of the sedimentation tank is regularly desilted by a sewage pump.

[0018] In the present invention, the biological purification pool adopts an algae-shellfish-microorganism mixed culture model; the depth of the biological purification pool is 3m; the algae are Isochrysis galbana and Chlorella vulgaris; the shellfish are scallops, oysters, and clams; the microorganisms are Planctomycetes, Firmicutes, Proteobacteria, Acidobacteria, Bacteroidetes, Chlorobacteria, and Armored Fungi; microbial preparations such as Bacillus, nitrifying bacteria, or EM bacteria are regularly applied according to the culture cycle to enhance the decomposition of water pollutants.

[0019] In the present invention, the aeration and oxygenation tank is 2 meters deep, and aeration and oxygenation equipment is installed at the edge of the tank; the aeration tank is divided into two parts: the bottom of the first half of the tank is laid with aeration pipes and aeration plates; the upper and bottom layers of the other half of the tank are respectively fixed with a nylon rope, and a bunch of brushes are hung every 20 cm in the middle of the rope for biofilm formation; microbial preparations such as photosynthetic bacteria, nitrifying bacteria, and bacillus are added to the aeration tank to accelerate the decomposition of organic matter in the water.

[0020] In the present invention, the ozone disinfection pool is 2 meters deep, and ozone equipment is installed beside the pool to transport ozone into the pool.

[0021] In the present invention, the ultraviolet disinfection utilizes a medium-pressure ultraviolet lamp with multi-frequency ultraviolet output, and the output range is 185-400nm, and the wavelength is ultraviolet light between 185-400nm.

[0022] In the present invention, the preparation of the modified biofilm filler comprises the following steps:

[0023] S1: Select commercially available polypropylene biofilm filler and perform plasma modification in a nitrogen atmosphere with a discharge frequency of 12-16 MHz, a gas flow rate of 20-50 ml / min, and a treatment time of 10-15 min;

[0024] S2: Immerse the pretreated polypropylene filler in an impregnation solution with a concentration of 10-20% at a temperature of 60-80°C, stir for 12-15 hours, and filter;

[0025] S3: The polypropylene filler obtained in step 2 is subjected to plasma modification in a nitrogen atmosphere at a discharge frequency of 12-16 MHz, a gas flow rate of 20-30 ml / min, and a treatment time of 40-100 min to obtain a modified biofilm filler;

[0026] In the present invention, the preparation method of the impregnation liquid is:

[0027] Add 0.4-3 parts of 3-methacryloyldopamine, 15-25 parts of maleic dialdehyde, 0.5-3 parts of [2H3]-p-vinylguaiacol, 2-5 parts of azobisisoheptonitrile, 320-400 parts of ethanol, and 3-7 parts of trehalose, and stir the mixture at a temperature of 50-60°C for 50-120 minutes to prepare the impregnation solution.

[0028] Reaction mechanism:

[0029] The free radicals on the surface of polypropylene filler reacted with 3-methacryloyldopamine, maleic anhydride, and [2H3]-p-vinylguaiacol to form a polymerization reaction, and trehalose molecules were also incorporated into the polymer.

[0030] Technical effects:

[0031] The integrated equipment and treatment method for industrialized seawater aquaculture tailwater treatment of the present invention have the following significant effects compared with the prior art:

[0032] 1. The recycling route of the present invention is used for regular and quantitative purification and disinfection of aquaculture tail water, removing water biological toxicity, mixing with fresh water, and then recycling it to the aquaculture pond for reuse, thereby maintaining the pH and salinity of the aquaculture water and removing harmful microorganisms;

[0033] 2. The purification and discharge route of the present invention is used for the regular and quantitative renewal of aquaculture tail water, which is discharged after meeting the discharge standards through processes such as A / O biochemical treatment, biological purification pool, ozone disinfection, aeration and oxygenation, and ultraviolet disinfection;

[0034] 3. The biological purification pond of the present invention adopts an algae-shellfish-microorganism mixed culture model. Shellfish are filter-feeding animals whose main source of nutrition is particulate matter, algae debris and plankton in seawater. Algae can absorb CO2 produced by shellfish respiration and nitrogen and phosphorus contained in metabolites and use them for photosynthesis, while the O2 produced by algae photosynthesis can be used for shellfish respiration. The purpose of reducing water pollutants is achieved by microorganisms absorbing and utilizing ammonia nitrogen, nitrite and organic matter in the tail water. A benign material cycle and energy flow are formed among the algae, shellfish and microorganisms. The three are mutually beneficial and symbiotic, each taking what they need. This can not only remove pollutants in the aquaculture system and alleviate the problem of eutrophication of water bodies, but also significantly improve the aquaculture efficiency per unit water body.

[0035] 4. The present invention uses a medium-pressure ultraviolet lamp with multi-frequency ultraviolet output for sterilization. The ultraviolet rays penetrate the microorganisms and destroy their DNA, making them unable to continue to reproduce and regenerate, thus having a highly efficient sterilization effect.

[0036] 5. The integrated equipment and treatment method for industrialized seawater aquaculture tailwater treatment of the present invention has a suspended solids removal rate of 95%, a COD removal rate of 92%, and a total nitrogen removal rate of 91%;

[0037] 6. The dihedral angles of the glycosidic bonds of the trehalose molecules on the surface of the polypropylene filler prepared by the present invention are not easily distorted. Its relatively rigid molecular structure is the basis for trehalose to play a protective role. By reducing the crystallization tendency on the solution side and alleviating the dehydration tendency on the phospholipid membrane side, it avoids dehydration damage to the biomembrane and plays a role in stabilizing the biomembrane.

[0038] 7. The dialdehyde, dopamine, and guaiacol on the surface of the polypropylene filler prepared by the present invention undergo chemical cross-linking with the long-chain polysaccharide molecules of the microorganisms to form a large, complex three-dimensional structure, which cross-links the long-chain polysaccharide molecules of the microorganisms to form a very stable matrix and improves the adhesion ability of the microbial membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is the process for treating tail water from marine aquaculture. DETAILED DESCRIPTION

[0040] The present invention can be better understood according to the following examples. However, it is easy for those skilled in the art to understand that the contents described in the examples are only used to illustrate the present invention, and should not and will not limit the present invention described in detail in the claims.

[0041] The tail water in the present invention is measured with reference to the national standard method "Marine Survey Specification Part 4: Seawater Chemical Element Survey" (GB / T12763.4-2007) and "Chemical Oxygen Demand - Alkaline Potassium Permanganate Method" (GB17378.4.32-2007);

[0042] The average contact angle was used to characterize the adhesion ability of the microbial film; the modified biofilm was placed in the turbot aquaculture tail water to conduct a microbial biofilm formation experiment.

[0043] Example 1

[0044] An integrated device and method for treating tail water from industrialized seawater aquaculture, the method comprising:

[0045] Aquaculture tail water comes from 900m 3 turbot fish breeding ponds;

[0046] Recycling: Aquaculture tail water enters microfiltration and protein separation, and the flow rate is controlled at 100m 3 / h, after ozone disinfection, aeration and oxygenation tank, and ultraviolet disinfection, most of the organic matter, ammonia nitrogen and harmful microorganisms are removed, and then injected into the reuse water pool, which is circulated once every 5 hours and mixed with 50m 3 / h fresh water;

[0047] Purification and discharge: according to the ratio of 10% of the aquaculture water discharged daily, 70m 3 It is discharged into the tailwater collection pool and becomes qualified water discharge after microfiltration, protein separation, A / O biochemical filter, sedimentation tank, biological purification tank, ozone disinfection, and aeration oxygenation tank.

[0048] The microfiltration width is 2m, filled with a fixed filter material layer; the particle sizes of the upper, middle and lower filter materials are 3cm, 5cm and 8cm respectively, and the height of each layer of filler is 50cm; the filter materials are pebbles, volcanic rocks and ceramsite.

[0049] The protein separation adopts a commercially available protein separator and a vortex pump to generate a large number of bubbles. These bubbles are all concentrated on the water surface to form foam. Protein and other impurities are all mixed and adsorbed on the foam. The foam is then collected and discharged to achieve the purpose of purifying the aquaculture tail water.

[0050] The A / O biochemical filter comprises an anoxic tank and an aerobic tank adjacent to each other, a partition provided between the anoxic tank and the aerobic tank, and a water flow channel connecting the anoxic tank and the aerobic tank. The anoxic tank is provided with a first filler layer for absorbing anoxic microorganisms and a submersible mixer; the aerobic tank is provided with a second filler layer for absorbing aerobic microorganisms, an aeration device and a reflux device.

[0051] The anoxic tank and the aerobic tank are fixed with modified biofilm fillers with a diameter of 120 mm. The center distance between the fillers is 80 mm. The fillers are intertwined with each other so that the entire space in the tower is filled with modified biofilm fillers. Each filler has a layer of 0.8 mm biofilm.

[0052] The sedimentation tank is 3m deep and is divided into three areas by partitions. The tail water in each area overflows from the top to the next area. The bottom of the sedimentation tank is regularly desilted using a sewage pump.

[0053] The biological purification pool adopts an algae-shellfish-microorganism mixed culture model; the depth of the biological purification pool is 3 meters; the algae are Isochrysis galbana and Chlorella vulgaris; the shellfish are scallops, oysters, and clams; the microorganisms are Planctomycetes, Firmicutes, Proteobacteria, Acidobacteria, Bacteroidetes, Chlorobacteria, and Armored Fungi; microbial preparations such as Bacillus, nitrifying bacteria, or EM bacteria are regularly applied according to the culture cycle to enhance the decomposition of water pollutants.

[0054] The aeration and oxygenation tank is 2 meters deep, and aeration and oxygenation equipment is installed at the edge of the tank. The aeration tank is divided into two parts: the bottom of the first half of the tank is laid with aeration pipes and aeration plates; the upper and bottom layers of the other half of the tank are respectively fixed with a nylon rope, and a bunch of brushes are hung every 20 cm in the middle of the rope for biofilm formation; microbial agents such as photosynthetic bacteria, nitrifying bacteria, and bacillus are added to the aeration tank to accelerate the decomposition of organic matter in the water.

[0055] The ozone disinfection pool is 2 meters deep, and ozone equipment is installed beside the pool to transport ozone into the pool.

[0056] The ultraviolet disinfection utilizes a medium-pressure ultraviolet lamp with multi-frequency ultraviolet output, and the output range is 185nm, and the wavelength is between 185nm.

[0057] The preparation of the modified biofilm filler comprises the following steps:

[0058] S1: Commercially available polypropylene biofilm filler was plasma modified in a nitrogen atmosphere with a discharge frequency of 12 MHz, a gas flow rate of 20 ml / min, and a treatment time of 10 min.

[0059] S2: Immerse the pretreated polypropylene filler in a 10% impregnation solution at 60°C for 12 hours, and filter.

[0060] S3: The polypropylene filler obtained in step 2 is subjected to plasma modification in a nitrogen atmosphere at a discharge frequency of 12 MHz, a gas flow rate of 20 ml / min, and a treatment time of 40 min to obtain a modified biofilm filler;

[0061] The preparation method of the impregnation liquid is:

[0062] Add 0.4 kg 3-methacryloyldopamine, 15 kg maleic dialdehyde, 0.5 kg [2H3]-p-vinylguaiacol, 2 kg azobisisoheptanenitrile, 320 kg ethanol, and 3 kg trehalose, and stir and react at 50° C. for 50 minutes to prepare the impregnation solution.

[0063] Example 2

[0064] An integrated device and method for treating tail water from industrialized seawater aquaculture, the method comprising:

[0065] Aquaculture tail water comes from 900m 3 turbot fish breeding ponds;

[0066] Recycling: Aquaculture tail water enters microfiltration and protein separation, and the flow rate is controlled at 110m 3 / h, after ozone disinfection, aeration and oxygenation tank, and ultraviolet disinfection, most of the organic matter, ammonia nitrogen and harmful microorganisms are removed and injected into the reuse water pool, which is circulated once every 6 hours and mixed with 70m 3 / h fresh water;

[0067] Purification and discharge: according to the daily discharge ratio of 12% of the aquaculture water, 80m 3 It is discharged into the tailwater collection pool and becomes qualified water discharge after microfiltration, protein separation, A / O biochemical filter, sedimentation tank, biological purification tank, ozone disinfection, and aeration oxygenation tank.

[0068] The microfiltration width is 2m, filled with a fixed filter material layer; the particle sizes of the upper, middle and lower filter materials are 4cm, 6cm and 9cm respectively, and the height of each layer of filler is 505cm; the filter materials are pebbles, volcanic rocks and ceramsite.

[0069] The protein separation adopts a commercially available protein separator and a vortex pump to generate a large number of bubbles. These bubbles are all concentrated on the water surface to form foam. Protein and other impurities are all mixed and adsorbed on the foam. The foam is then collected and discharged to achieve the purpose of purifying the aquaculture tail water.

[0070] The A / O biochemical filter comprises an anoxic tank and an aerobic tank adjacent to each other, a partition provided between the anoxic tank and the aerobic tank, and a water flow channel connecting the anoxic tank and the aerobic tank. The anoxic tank is provided with a first filler layer for absorbing anoxic microorganisms and a submersible mixer; the aerobic tank is provided with a second filler layer for absorbing aerobic microorganisms, an aeration device and a reflux device.

[0071] The anoxic tank and the aerobic tank are fixed with modified biofilm fillers with a diameter of 130 mm. The center distance between the fillers is 100 mm. The fillers are intertwined with each other so that the entire space in the tower is filled with modified biofilm fillers. Each filler has a 1 mm layer of biofilm.

[0072] The sedimentation tank is 3m deep and is divided into three areas by partitions. The tail water in each area overflows from the top to the next area. The bottom of the sedimentation tank is regularly desilted using a sewage pump.

[0073] The biological purification pool adopts an algae-shellfish-microorganism mixed culture model; the depth of the biological purification pool is 3 meters; the algae are Isochrysis galbana and Chlorella vulgaris; the shellfish are scallops, oysters, and clams; the microorganisms are Planctomycetes, Firmicutes, Proteobacteria, Acidobacteria, Bacteroidetes, Chlorobacteria, and Armored Fungi; microbial preparations such as Bacillus, nitrifying bacteria, or EM bacteria are regularly applied according to the culture cycle to enhance the decomposition of water pollutants.

[0074] The aeration and oxygenation tank is 2 meters deep, and aeration and oxygenation equipment is installed at the edge of the tank. The aeration tank is divided into two parts: the bottom of the first half of the tank is laid with aeration pipes and aeration plates; the upper and bottom layers of the other half of the tank are respectively fixed with a nylon rope, and a bunch of brushes are hung every 20 cm in the middle of the rope for biofilm formation; microbial agents such as photosynthetic bacteria, nitrifying bacteria, and bacillus are added to the aeration tank to accelerate the decomposition of organic matter in the water.

[0075] The ozone disinfection pool is 2 meters deep, and ozone equipment is installed beside the pool to transport ozone into the pool.

[0076] The ultraviolet disinfection utilizes a medium-pressure ultraviolet lamp with multi-frequency ultraviolet output, and the output range is 250nm, and the wavelength is ultraviolet light between 250nm.

[0077] The preparation of the modified biofilm filler comprises the following steps:

[0078] S1: Commercially available polypropylene biofilm filler was plasma modified in a nitrogen atmosphere with a discharge frequency of 13 MHz, a gas flow rate of 30 ml / min, and a treatment time of 12 min.

[0079] S2: Immerse the pretreated polypropylene filler in a 15% impregnation solution at 65°C for 13 hours, and filter.

[0080] S3: The polypropylene filler obtained in step 2 was subjected to plasma modification in a nitrogen atmosphere at a discharge frequency of 13 MHz, a gas flow rate of 25 ml / min, and a treatment time of 60 min to obtain a modified biofilm filler;

[0081] The preparation method of the impregnation liquid is:

[0082] Add 1 kg of 3-methacryloyldopamine, 18 kg of maleic dialdehyde, 1 kg of [2H3]-p-vinylguaiacol, 3 kg of azobisisoheptonitrile, 350 kg of ethanol, and 4 kg of trehalose, and stir and react at a temperature of 55° C. for 80 minutes to prepare the impregnation solution.

[0083] Example 3

[0084] An integrated device and method for treating tail water from industrialized seawater aquaculture, the method comprising:

[0085] Aquaculture tail water comes from 900m 3 turbot fish breeding ponds;

[0086] Recycling: Aquaculture tail water enters microfiltration and protein separation, and the flow rate is controlled at 140m 3 / h, after ozone disinfection, aeration and oxygenation tank, and ultraviolet disinfection, most of the organic matter, ammonia nitrogen and harmful microorganisms are removed and injected into the reuse water pool, which is circulated once every 6 hours and mixed with 90m 3 / h fresh water;

[0087] Purification and discharge: According to the daily discharge ratio of 14% of the aquaculture water, 70-100m 3 It is discharged into the tailwater collection pool and becomes qualified water discharge after microfiltration, protein separation, A / O biochemical filter, sedimentation tank, biological purification tank, ozone disinfection, and aeration oxygenation tank.

[0088] The microfiltration width is 2m, filled with a fixed filter material layer; the particle sizes of the upper, middle and lower filter materials are 4cm, 7cm and 9cm respectively, and the height of each layer of filler is 65cm; the filter materials are pebbles, volcanic rocks and ceramsite.

[0089] The protein separation adopts a commercially available protein separator and a vortex pump to generate a large number of bubbles. These bubbles are all concentrated on the water surface to form foam. Protein and other impurities are all mixed and adsorbed on the foam. The foam is then collected and discharged to achieve the purpose of purifying the aquaculture tail water.

[0090] The A / O biochemical filter comprises an anoxic tank and an aerobic tank adjacent to each other, a partition provided between the anoxic tank and the aerobic tank, and a water flow channel connecting the anoxic tank and the aerobic tank. The anoxic tank is provided with a first filler layer for absorbing anoxic microorganisms and a submersible mixer; the aerobic tank is provided with a second filler layer for absorbing aerobic microorganisms, an aeration device and a reflux device.

[0091] The anoxic tank and the aerobic tank are fixed with modified biofilm fillers with a diameter of 140 mm. The center distance between the fillers is 130 mm. The fillers are intertwined with each other so that the entire space in the tower is filled with modified biofilm fillers. Each filler has a layer of biofilm of about 2.5 mm.

[0092] The sedimentation tank is 3m deep and is divided into three areas by partitions. The tail water in each area overflows from the top to the next area. The bottom of the sedimentation tank is regularly desilted using a sewage pump.

[0093] The biological purification pool adopts an algae-shellfish-microorganism mixed culture model; the depth of the biological purification pool is 3 meters; the algae are Isochrysis galbana and Chlorella vulgaris; the shellfish are scallops, oysters, and clams; the microorganisms are Planctomycetes, Firmicutes, Proteobacteria, Acidobacteria, Bacteroidetes, Chlorobacteria, and Armored Fungi; microbial preparations such as Bacillus, nitrifying bacteria, or EM bacteria are regularly applied according to the culture cycle to enhance the decomposition of water pollutants.

[0094] The aeration and oxygenation tank is 2 meters deep, and aeration and oxygenation equipment is installed at the edge of the tank. The aeration tank is divided into two parts: the bottom of the first half of the tank is laid with aeration pipes and aeration plates; the upper and bottom layers of the other half of the tank are respectively fixed with a nylon rope, and a bunch of brushes are hung every 20 cm in the middle of the rope for biofilm formation; microbial agents such as photosynthetic bacteria, nitrifying bacteria, and bacillus are added to the aeration tank to accelerate the decomposition of organic matter in the water.

[0095] The ozone disinfection pool is 2 meters deep, and ozone equipment is installed beside the pool to transport ozone into the pool.

[0096] The ultraviolet disinfection utilizes a medium-pressure ultraviolet lamp with multi-frequency ultraviolet output, and the output range is 350nm, and the wavelength is ultraviolet light between 350nm.

[0097] The preparation of the modified biofilm filler comprises the following steps:

[0098] S1: Commercially available polypropylene biofilm filler was plasma modified in a nitrogen atmosphere with a discharge frequency of 15 MHz, a gas flow rate of 40 ml / min, and a treatment time of 14 min.

[0099] S2: Immerse the pretreated polypropylene filler in a 15% impregnation solution at 75°C for 14 hours, and filter.

[0100] S3: The polypropylene filler obtained in step 2 was subjected to plasma modification in a nitrogen atmosphere at a discharge frequency of 15 MHz, a gas flow rate of 25 ml / min, and a treatment time of 90 min to obtain a modified biofilm filler;

[0101] The preparation method of the impregnation liquid is:

[0102] Add 2 kg of 3-methacryloyldopamine, 23 kg of maleic dialdehyde, 2 kg of [2H3]-p-vinylguaiacol, 4 kg of azobisisoheptonitrile, 380 kg of ethanol, and 6 kg of trehalose, and stir and react at a temperature of 55° C. for 100 minutes to prepare the impregnation solution.

[0103] Example 4

[0104] An integrated device and method for treating tail water from industrialized seawater aquaculture, the method comprising:

[0105] Aquaculture tail water comes from 900m 3 turbot fish breeding ponds;

[0106] Recycling: Aquaculture tail water enters microfiltration and protein separation, and the flow rate is controlled at 150m 3 / h, after ozone disinfection, aeration and oxygenation tank, and ultraviolet disinfection, most of the organic matter, ammonia nitrogen and harmful microorganisms are removed, and then injected into the reuse water pool, which is circulated once every 7 hours and mixed with 100m 3 / h fresh water;

[0107] Purification and discharge: according to the daily discharge ratio of 15% of the aquaculture water, 100m 3 It is discharged into the tailwater collection pool and becomes qualified water discharge after microfiltration, protein separation, A / O biochemical filter, sedimentation tank, biological purification tank, ozone disinfection, and aeration oxygenation tank.

[0108] The microfiltration width is 2m, filled with a fixed filter material layer; the particle sizes of the upper, middle and lower filter materials are 5cm, 8cm and 10cm respectively, and the height of each layer of filler is 70cm; the filter materials are pebbles, volcanic rocks and ceramsite.

[0109] The protein separation adopts a commercially available protein separator and a vortex pump to generate a large number of bubbles. These bubbles are all concentrated on the water surface to form foam. Protein and other impurities are all mixed and adsorbed on the foam. The foam is then collected and discharged to achieve the purpose of purifying the aquaculture tail water.

[0110] The A / O biochemical filter comprises an anoxic tank and an aerobic tank adjacent to each other, a partition provided between the anoxic tank and the aerobic tank, and a water flow channel connecting the anoxic tank and the aerobic tank. The anoxic tank is provided with a first filler layer for absorbing anoxic microorganisms and a submersible mixer; the aerobic tank is provided with a second filler layer for absorbing aerobic microorganisms, an aeration device and a reflux device.

[0111] The anoxic tank and the aerobic tank are fixed with modified biofilm fillers with a diameter of 150mm. The center distance between the fillers is 150mm. The fillers are intertwined with each other so that the entire space in the tower is filled with modified biofilm fillers. Each filler has a layer of biofilm of about 3mm.

[0112] The sedimentation tank is 3m deep and is divided into three areas by partitions. The tail water in each area overflows from the top to the next area. The bottom of the sedimentation tank is regularly desilted using a sewage pump.

[0113] The biological purification pool adopts an algae-shellfish-microorganism mixed culture model; the depth of the biological purification pool is 3 meters; the algae are Isochrysis galbana and Chlorella vulgaris; the shellfish are scallops, oysters, and clams; the microorganisms are Planctomycetes, Firmicutes, Proteobacteria, Acidobacteria, Bacteroidetes, Chlorobacteria, and Armored Fungi; microbial preparations such as Bacillus, nitrifying bacteria, or EM bacteria are regularly applied according to the culture cycle to enhance the decomposition of water pollutants.

[0114] The aeration and oxygenation tank is 2 meters deep, and aeration and oxygenation equipment is installed at the edge of the tank. The aeration tank is divided into two parts: the bottom of the first half of the tank is laid with aeration pipes and aeration plates; the upper and bottom layers of the other half of the tank are respectively fixed with a nylon rope, and a bunch of brushes are hung every 20 cm in the middle of the rope for biofilm formation; microbial agents such as photosynthetic bacteria, nitrifying bacteria, and bacillus are added to the aeration tank to accelerate the decomposition of organic matter in the water.

[0115] The ozone disinfection pool is 2 meters deep, and ozone equipment is installed beside the pool to transport ozone into the pool.

[0116] The ultraviolet disinfection utilizes a medium-pressure ultraviolet lamp with multi-frequency ultraviolet output, and the output range is 400nm, and the wavelength is between 400nm.

[0117] The preparation of the modified biofilm filler comprises the following steps:

[0118] S1: Commercially available polypropylene biofilm filler was plasma modified in a nitrogen atmosphere with a discharge frequency of 16 MHz, a gas flow rate of 50 ml / min, and a treatment time of 15 min.

[0119] S2: Immerse the pretreated polypropylene filler in a 20% impregnation solution at 80°C for 15 hours, and filter.

[0120] S3: The polypropylene filler obtained in step 2 is subjected to plasma modification in a nitrogen atmosphere at a discharge frequency of 16 MHz, a gas flow rate of 30 ml / min, and a treatment time of 100 min to obtain a modified biofilm filler;

[0121] The preparation method of the impregnation liquid is:

[0122] Add 3 kg of 3-methacryloyldopamine, 25 kg of maleic dialdehyde, 3 kg of [2H3]-p-vinylguaiacol, 5 kg of azobisisoheptonitrile, 400 kg of ethanol, and 7 kg of trehalose, and stir the mixture at a temperature of 60° C. for 120 minutes to prepare the impregnation solution.

[0123] Comparative Example 1

[0124] During the preparation of the impregnation solution, 3-methacryloyldopamine was not added, and the other procedures were the same as in Example 1.

[0125] Comparative Example 2

[0126] No maleic acid aldehyde was added during the preparation of the impregnation solution, and the other procedures were the same as in Example 1.

[0127] Comparative Example 3

[0128] During the preparation of the impregnation solution, [2H3]-p-vinylguaiacol was not added, and the other procedures were the same as in Example 1.

[0129]

[0130] By comparing the data of the above examples with those of the comparative examples, the average contact angle of the modified biofilm prepared by the present invention is 35°, which is conducive to the adhesion of microorganisms; in addition, the integrated equipment and treatment method for industrial seawater aquaculture tail water treatment of the present invention have a suspended matter removal rate of 95%, a COD removal rate of 92%, and a total nitrogen removal rate of 91%.

[0131] The present invention provides an integrated device and method for treating industrialized marine aquaculture tailwater. While numerous methods and approaches exist for implementing this technical solution, the foregoing description represents only a preferred embodiment of the present invention. It should be noted that improvements and modifications could be made by those skilled in the art without departing from the principles of the present invention, and such improvements and modifications are considered within the scope of the present invention. Any components not specified in this embodiment may be implemented using existing technologies.

Claims

1. A method for treating tail water from industrialized seawater aquaculture, comprising: Aquaculture tail water comes from 900m 3 turbot fish breeding ponds; Recycling: Aquaculture tail water enters microfiltration and protein separation in sequence, with the flow rate controlled at 100-150m 3 / h, and then pass through ozone disinfection, aeration oxygenation tank, and ultraviolet disinfection in sequence to remove most of the organic matter, ammonia nitrogen and harmful microorganisms, and then inject into the reuse water pool, circulate once every 5-7h, and add 50-100m 3 / h fresh water; Purification and discharge: according to the daily discharge ratio of 10-15% of the aquaculture tail water, 70-100m 3 It is discharged into the tailwater collection pool and then passes through microfiltration, protein separation, A / O biochemical filter, sedimentation tank, biological purification tank, ozone disinfection, and aeration oxygenation tank in sequence before becoming qualified water for discharge; The A / O biochemical filter is provided with an anoxic tank and an aerobic tank adjacent to each other, a partition is provided between the anoxic tank and the aerobic tank, and a water flow channel connecting the anoxic tank and the aerobic tank is provided on the partition; a first filler layer for absorbing anoxic microorganisms and a submersible mixer are provided in the anoxic tank; a second filler layer for absorbing aerobic microorganisms, an aeration device and a reflux device are provided in the aerobic tank; The modified biofilm fillers with a diameter of 120-150 mm are fixed in the anoxic tank and the aerobic tank, the center distance between the fillers is 80-150 mm, and the fillers are intertwined with each other so that the entire space in the tower is filled with the modified biofilm fillers, and each filler has a layer of 0.8-3 mm biofilm; The preparation of the modified biofilm filler comprises the following steps: S1: Select commercially available polypropylene biofilm filler and perform plasma modification in a nitrogen atmosphere with a discharge frequency of 12-16 MHz, a gas flow rate of 20-50 mL / min, and a treatment time of 10-15 min; S2: Immerse the modified polypropylene filler in an impregnation solution with a concentration of 10-20% at a temperature of 60-80°C, stir for 12-15 hours, and filter; S3: The polypropylene filler obtained in step 2 is subjected to plasma modification in a nitrogen atmosphere at a discharge frequency of 12-16 MHz, a gas flow rate of 20-30 mL / min, and a treatment time of 40-100 min to obtain a modified biofilm filler; The preparation method of the impregnation liquid is: The impregnation solution is prepared by adding 0.4-3 parts of 3-methacryloyldopamine, 15-25 parts of maleic dialdehyde, 0.5-3 parts of [2H3]-p-vinylguaiacol, 2-5 parts of azobisisoheptonitrile, 320-400 parts of ethanol, and 3-7 parts of trehalose, and stirring the mixture at a temperature of 50-60°C for 50-120 minutes.

2. The method for treating tail water from industrialized seawater aquaculture according to claim 1, wherein: The protein separation adopts a protein separator and a vortex pump to generate a large number of bubbles. These bubbles are all concentrated on the water surface to form foam. Protein impurities are all mixed and adsorbed on the foam. The foam is then collected and discharged to achieve the purpose of purifying the aquaculture tail water.

3. The method for treating tail water from industrialized seawater aquaculture according to claim 1, wherein: The sedimentation tank is 3m deep and is divided into three areas by partitions. The tail water in each area overflows from the top to the next area. The bottom of the sedimentation tank is regularly desilted using a sewage pump.

4. The method for treating tail water from industrialized seawater aquaculture according to claim 1, wherein: The biological purification pool is a mixed culture model of algae, shellfish and microorganisms; the depth of the biological purification pool is 3m; The algae are Isochrysis galbana and Chlorella vulgaris; the shellfish are scallops, oysters, and clams; the microorganisms are Planctomyces, Firmicutes, Proteobacteria, Acidobacteria, Bacteroidetes, Chlorobacteria, and Armored Fungi; Bacillus, nitrifying bacteria, or EM bacteria are applied regularly according to the breeding cycle to enhance the decomposition of water pollutants.

5. The method for treating tail water from industrialized seawater aquaculture according to claim 1, wherein: The aeration and oxygenation tank is 2m deep, and aeration and oxygenation equipment is installed on the side of the tank; the aeration tank is divided into two parts: Aeration pipes and aeration plates are laid on the bottom of the first half of the pond; a nylon rope is fixed on the upper and bottom layers of the other half of the pond, and a bunch of brushes are hung every 20 cm in the middle of the rope to form biofilm; microbial agents such as photosynthetic bacteria, nitrifying bacteria, and Bacillus are added to the aeration tank to accelerate the decomposition of organic matter in the water.

6. The method for treating tail water from industrialized seawater aquaculture according to claim 1, wherein: The ozone disinfection pool is 2 meters deep, and ozone equipment is installed beside the pool to transport ozone into the pool.

7. The method for treating tail water from industrialized seawater aquaculture according to claim 1, wherein: The ultraviolet disinfection utilizes a medium-pressure ultraviolet lamp with multi-frequency ultraviolet output, and the output wavelength range of the ultraviolet light is between 185-400nm.

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