CN114772864A - Mariculture waste water recovery processing system - Google Patents
Mariculture waste water recovery processing system Download PDFInfo
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- CN114772864A CN114772864A CN202210529810.0A CN202210529810A CN114772864A CN 114772864 A CN114772864 A CN 114772864A CN 202210529810 A CN202210529810 A CN 202210529810A CN 114772864 A CN114772864 A CN 114772864A
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- 238000009364 mariculture Methods 0.000 title claims abstract description 33
- 239000002351 wastewater Substances 0.000 title claims abstract description 30
- 238000011084 recovery Methods 0.000 title description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000007788 liquid Substances 0.000 claims abstract description 37
- 238000000926 separation method Methods 0.000 claims abstract description 36
- 238000001471 micro-filtration Methods 0.000 claims abstract description 33
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 33
- 238000001728 nano-filtration Methods 0.000 claims abstract description 28
- 238000001914 filtration Methods 0.000 claims abstract description 26
- 241000361919 Metaphire sieboldi Species 0.000 claims abstract description 20
- 238000009360 aquaculture Methods 0.000 claims abstract description 18
- 244000144974 aquaculture Species 0.000 claims abstract description 18
- 238000004064 recycling Methods 0.000 claims abstract description 17
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- 125000004122 cyclic group Chemical group 0.000 claims description 6
- 238000009210 therapy by ultrasound Methods 0.000 claims description 3
- 238000009264 composting Methods 0.000 claims description 2
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/60—Floating cultivation devices, e.g. rafts or floating fish-farms
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K63/00—Receptacles for live fish, e.g. aquaria; Terraria
- A01K63/04—Arrangements for treating water specially adapted to receptacles for live fish
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K63/00—Receptacles for live fish, e.g. aquaria; Terraria
- A01K63/04—Arrangements for treating water specially adapted to receptacles for live fish
- A01K63/045—Filters for aquaria
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K67/00—Rearing or breeding animals, not otherwise provided for; New or modified breeds of animals
- A01K67/033—Rearing or breeding invertebrates; New breeds of invertebrates
- A01K67/0332—Earthworms
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/306—Pesticides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Animal Husbandry (AREA)
- Marine Sciences & Fisheries (AREA)
- Zoology (AREA)
- Animal Behavior & Ethology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a mariculture wastewater recycling system, which comprises: the system comprises a culture net cage, a primary solid-liquid separation device, a microfiltration device, an ultrafiltration device, a nanofiltration device, a plate-frame filtration device, an earthworm culture device, a feeding device and a biochemical treatment device. The aquaculture net cage is used for mariculture, and a water inlet of the primary solid-liquid separation device is communicated with the aquaculture net cage. The water outlet of the primary solid-liquid separation device is communicated with the microfiltration device, the water outlet of the microfiltration device is conveyed to the ultrafiltration device, and the water outlet of the ultrafiltration device is connected with the nanofiltration device. The concentrated water outlet of the ultrafiltration device is communicated with the biochemical treatment device, the concentrated solution port of the microfiltration device is connected with the plate frame filter device, the mud cake outlet of the plate frame filter device is connected with the earthworm culturing device, the earthworm culturing device is connected with the feeding device, and the water outlet of the plate frame filter device is connected with the microfiltration device. The invention can efficiently treat the wastewater containing antibiotics.
Description
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a mariculture wastewater recovery treatment system.
Background
In recent years, mariculture is rapidly developed, and in the process of mariculture, antibiotics are added into feed to prevent and treat animal diseases and increase the yield of aquatic products. However, it has been found that only a small amount of the antibiotics used in aquaculture are absorbed by the animals, at least 75% enter the natural environment and form cumulative pollution, wherein the discharge of the wastewater from mariculture becomes an important way for the antibiotics to enter the environment and causes a series of environmental problems.
Mariculture easily produces adverse effects on marine environment, wherein, the excretion of culture objects, the decomposition of residual baits and the poor water flow condition lead to the continuous accumulation of nutrient salts in the culture water body, which easily causes offshore eutrophication pollution and even leads to red tide. CN110002665A discloses a purification treatment method for seawater culture tail water discharge, which includes a seawater culture tail water collection system, an activated sludge and precipitation sludge reduction purification system and a biological purification system, the method can remove ammonia nitrogen, nitrite nitrogen and active phosphate in the tail water, and effectively reduce the risk of nitrogen and phosphorus entering the seawater; CN110950436A discloses a seawater pond culture tail water treatment system and a treatment method, which adopts filter feeding animals for treatment, then carries out microbial purification, and then carries out algae purification treatment. However, the above treatment method only treats the nutrients in the wastewater and does not effectively treat the antibiotics in the wastewater. Meanwhile, the existence of antibiotics can affect the microbial purification system.
How to rapidly and efficiently treat mariculture wastewater containing antibiotics and recover effective components thereof to solve the problem which needs to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a mariculture wastewater recycling and treating system which can efficiently treat wastewater containing antibiotics.
A mariculture wastewater recycling system, comprising: the device comprises a culture net cage, a primary solid-liquid separation device, a microfiltration device, an ultrafiltration device, a nanofiltration device, a plate-frame filtration device, an earthworm culture device, a feeding device and a biochemical treatment device. The aquaculture net cage is used for mariculture, a water inlet of the primary solid-liquid separation device is communicated with the aquaculture net cage, a water outlet of the primary solid-liquid separation device is communicated with the microfiltration device, and a water outlet of the microfiltration device is conveyed to the ultrafiltration device. The water outlet of the ultrafiltration device is connected with the nanofiltration device, the concentrated water outlet of the ultrafiltration device is communicated with the biochemical treatment device, and the concentrated solution port of the microfiltration device is connected with the plate frame filtration device. The mud cake outlet of the plate-and-frame filtering device is connected with the earthworm culturing device, the earthworm culturing device is connected with the feeding device, the water outlet of the plate-and-frame filtering device is connected with the microfiltration device, and the outlet water of the nanofiltration device is directly discharged.
Further, one or more devices of the primary solid-liquid separation device, the plate-frame filtering device and the ultrafiltration device are subjected to ultrasonic treatment.
Further, a sludge outlet of the primary solid-liquid separation device is connected with the plate frame filtering device.
Further, a concentrated solution outlet of the nanofiltration device is communicated with the feeding device. And conveying the concentrated solution of the nanofiltration device to an ultrafiltration device for cyclic concentration. Preferably, the cyclic concentration is performed 5 to 18 times.
Further, a three-way valve is arranged on the microfiltration device, the three-way valve is provided with an A end 10 and a B end 11, the A end 10 of the three-way valve is connected with the plate frame filtering device, and the B end 11 of the three-way valve is connected with the primary solid-liquid separation device.
Further, when water enters the A end 10 of the three-way valve, the circulation concentration is carried out.
Furthermore, the upper portion of the aquaculture net cage is provided with a purse net, the bottom of the purse net is a conical bottom, the bottom of the conical bottom is provided with a mud outlet, and the top of the conical bottom is provided with a water outlet pipe. Preferably, the water outlet of the frame filtering device is communicated with the microfiltration device.
Further, the primary solid-liquid separation device is conveyed to the earthworm cultivation device 7 or an aerobic composting site.
Furthermore, a stirring device is arranged in the feeding device, and the concentrated solution of the nanofiltration device 5 is introduced into the feeding device to be mixed with bait.
The mariculture wastewater recycling treatment system has the following advantages:
1. a large amount of bait residues and excrement can be generated in the mariculture process, the eutrophication degree in seawater can be caused, and the residues in the mariculture process can be quickly collected by adopting a multi-stage filtration mode, so that the residues are prevented from being decomposed and entering the seawater.
2. The residue obtained by primary solid-liquid separation is conveyed to an earthworm culture device to be cultured, nutrient substances in the residue are effectively utilized, high-quality protein bait, namely earthworms, is produced, and meanwhile, the production of sludge can be reduced.
3. A large amount of antibiotics are used in the mariculture process, part of the antibiotics directly enter a seawater body when being directly mixed into bait, and the other part of the antibiotics is difficult to absorb after being ingested and enters the water body through excrement, so that medicine residues in the water body environment are caused. The invention adopts multi-stage filtration, a primary solid-liquid separation device is adopted to separate large-particle bait residues and/or excreta in the water body, the effluent enters a microfiltration device, the microfiltration device further separates particulate matters in the effluent, the microfiltration effluent enters ultrafiltration for further separation, the ultrafiltration pore diameter can separate antibiotic substances from protein substances in the wastewater, the antibiotic in the water body is firstly concentrated, the ultrafiltration effluent enters a nanofiltration device for further concentration of the antibiotic, and simultaneously the salt and the antibiotic in the nanofiltration concentrated water are separated.
4. Antibiotics in part of water are recovered from the nanofiltration concentrated solution and can be directly conveyed to a feeding device, so that the using amount of the antibiotics is reduced;
5. solid matters obtained by separation of the primary solid-liquid separation device and the microfiltration device are conveyed to the earthworm culture device for culture, so that high-quality protein can be obtained while solid wastes are reduced, bait is provided for mariculture, meanwhile, the obtained earthworms can be conveyed to the feeding device, the earthworms such as antibiotic medicines are mixed, the antibiotic absorbed by the earthworms cannot be diffused into seawater, and can be directly swallowed and absorbed by aquaculture, and the risk of conveying the antibiotic to a water body by the bait is reduced;
6. the micro-filtration device is provided with the three-way valve, wastewater entering the micro-filtration device is separately treated, and the concentration of antibiotics is very low compared with that of seawater, so that most of the antibiotics are adsorbed on bait and excrement.
Drawings
FIG. 1 is a schematic view of a mariculture wastewater recycling system;
FIG. 2 is a schematic view of a mariculture wastewater recycling system.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
A mariculture wastewater recycling system, see fig. 1, comprising: the system comprises a culture net cage 1, a primary solid-liquid separation device 2, a microfiltration device 3, an ultrafiltration device 4, a nanofiltration device 5, a plate frame filtration device 6, an earthworm culture device 7, a feeding device 8 and a biochemical treatment device 9. The aquaculture net cage 1 is used for mariculture, a water inlet of the primary solid-liquid separation device 2 is communicated with the aquaculture net cage 1, and a water outlet of the primary solid-liquid separation device 2 is communicated with the microfiltration device 3. And the water outlet of the microfiltration device 3 is conveyed to the ultrafiltration device 4, and the water outlet of the ultrafiltration device is connected with the nanofiltration device 5. The concentrated water outlet of the ultrafiltration device 4 is communicated with the biochemical treatment device 9, the concentrated solution port of the microfiltration device 3 is connected with the plate frame filter device 6, the mud cake outlet of the plate frame filter device 6 is connected with the earthworm culture device 7, and the earthworm culture device 7 is connected with the feeding device 8. The water outlet of the plate frame filtering device 6 is connected with the microfiltration device 3, and the outlet water of the nanofiltration device is directly discharged; the plate frame filtering device 7 is subjected to ultrasonic treatment; the concentrated solution outlet of the nanofiltration device 5 is communicated with the feeding device 8; and conveying the concentrated solution of the nanofiltration device 5 to an ultrafiltration device 4 for cyclic concentration.
The method comprises the following specific steps:
1) and (3) throwing the bait mixed with the antibiotics into the aquaculture net cage 1 for feeding, and conveying the wastewater at the bottom of the aquaculture net cage 1 to the primary solid-liquid separation device 2 through a pump after 6-12 hours.
2) The effluent of the primary solid-liquid separation device 2 is sequentially conveyed to a microfiltration device 3(0.1-0.2Mpa, the microfiltration device mainly has the function of removing impurities such as silt, clay, rust, suspended matters, algae, biological slime, corrosion products, macromolecular bacteria, organic matters and other tiny particles in water to achieve the purpose of purifying water), an ultrafiltration device 4(0.2-0.3MPa, the ultrafiltration device is an advanced membrane separation technology, and a solvent and various small solutes contained in feed liquid permeate through a filter membrane from a high-pressure feed liquid side to a low-pressure side, so that permeate liquid or ultrafiltrate is obtained; the micro-pores of the ultrafiltration membrane can reach below 0.01 micron (one hundred thousand millimeters), particles, colloid, bacteria, heat sources and organic matters in water can be effectively removed, solute molecules with the size larger than the pore diameter of the membrane are intercepted by the membrane to form concentrated solution), the nanofiltration device 5(0.7-0.9Mpa, and the nanofiltration device shows the following three remarkable characteristics in the separation application of the nanofiltration device), wherein the intercepted molecular weight of the nanofiltration device is between that of the reverse osmosis membrane and that of the ultrafiltration membrane, and is 200-; secondly, the nanofiltration membrane has a certain retention rate to inorganic salts, because the surface separation layer is composed of polyelectrolyte and has electrostatic interaction to ions), the concentrated water of the ultrafiltration device is conveyed to the biochemical treatment device 9.
3) The primary solid-liquid separation device 2 adopts a coarse grid (10mm) and a fine grid (2mm), mud cakes obtained by the primary solid-liquid separation device 2 are conveyed to a plate-frame filtering device 6, dehydration treatment is carried out under the ultrasonic action (the frequency is 30-35kHz, and the power is 50-150W) until the water content of sludge reaches 60-75%, waste liquid obtained by the plate-frame filtering device 6 is conveyed to a micro-filtering device 3, and the mud cakes are conveyed to an earthworm culturing device 7.
4) The concentrated solution of the ultrafiltration device 4 is delivered to the biochemical treatment device 9.
5) The earthworms obtained in the earthworm culturing device 7 are conveyed to a feeding device 8 as baits to prepare for feeding the baits into the aquaculture net cage.
The antibiotic content of the aquaculture water body treated by the scheme after 20 days is as follows: oxytetracycline is 3.4 +/-0.4 ng/L, chloramphenicol is 1.1 +/-0.5 ng/L, and ofloxacin is 2.2 +/-0.6 ng/L; CODcr45 plus or minus 5mg/L and the content of ammonia nitrogen is 0.42 plus or minus 0.05 mg/L.
The comparative example adopts a conventional biochemical water treatment mode: the antibiotic content of the aquaculture water body is as follows: 43.2 +/-3.4 ng/L of oxytetracycline, 5.6 +/-0.8 ng/L of chloramphenicol and 34.3 +/-2.6 ng/L of ofloxacin; CODcr135 plus or minus 15mg/L and 3.2 plus or minus 0.5mg/L of ammonia nitrogen.
Example 2
On the basis of the example 1, referring to fig. 2, a three-way valve is arranged on the microfiltration device 3, the three-way valve has an a end 10 and a B end 11, the a end 10 of the three-way valve is connected with the plate frame filtration device 6, and the B end 11 of the three-way valve is connected with the primary solid-liquid separation device.
The method comprises the following specific steps:
1) feeding the bait mixed with the antibiotics into the aquaculture net cage 1, conveying the wastewater at the bottom of the aquaculture net cage 1 to the primary solid-liquid separation device 2 through a pump after 6-12 hours,
2) the effluent of the primary solid-liquid separation device 2 is sequentially conveyed to a microfiltration device 3(0.1-0.2MPa), an ultrafiltration device 4(0.2-0.3MPa) and a nanofiltration device 5(0.7-0.9MPa), and the concentrated water of the ultrafiltration device is conveyed to a biochemical treatment device 9;
3) the primary solid-liquid separation device 2 adopts a coarse grid (10mm) and a fine grid (2mm), and the mud cakes obtained by the primary solid-liquid separation device 2 are conveyed to a plate frame filtering device 6. Dewatering under the ultrasonic action (the frequency is 30-35kHz, the power is 50-150W) until the water content of the sludge is 60-75%, conveying the waste liquid (the concentration of antibiotics is 11mg/L) obtained by the plate-and-frame filtering device 6 to the end A10 of a three-way valve arranged on the microfiltration device 3, and conveying the concentrated solution of the nanofiltration device 5 to the ultrafiltration device 4 for circular concentration. And the circular concentration is carried out for 10 times, the concentration ratio of the chloramphenicol is 18 times, and the mud cake is conveyed to the earthworm culture device 7.
4) The concentrated solution of the ultrafiltration device 4 is delivered to the biochemical treatment device 9.
5) The earthworms obtained from the earthworm culturing device 7 are used as baits to be conveyed to a feeding device 8 to prepare for feeding the baits into the aquaculture net cage; and concentrated solution obtained in the circulating concentration process is conveyed to a pasteurization device for sterilization and then conveyed to the feeding device 8 for mixing.
Example 3
The concentrated solution obtained by the cyclic concentration was used after being subjected to a concentration treatment based on example 3.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (10)
1. A mariculture wastewater recycling system, comprising: breed net cage (1), elementary solid-liquid separation equipment (2), micro-filtration device (3), ultrafiltration device (4), nanofiltration device (5), sheet frame filter equipment (6), earthworm culture apparatus (7), throw material device (8), biochemical treatment device (9), breed net cage (1) is used for mariculture, the water inlet intercommunication of elementary solid-liquid separation equipment (2) breed net cage (1), the delivery port intercommunication of elementary solid-liquid separation equipment (2) micro-filtration device (3), micro-filtration device (3) delivery port carry to ultrafiltration device (4), the ultrafiltration device delivery port is connected nanofiltration device (5), ultrafiltration device (4) concentrated water export intercommunication biochemical treatment device (9), the concentrated liquid mouth of micro-filtration device (3) is connected sheet frame filter equipment (6), the mud cake outlet of the plate frame filtering device (6) is connected with the earthworm culturing device (7), the earthworm culturing device (7) is connected with the feeding device (8), and the water outlet of the plate frame filtering device (6) is connected with the microfiltration device (3).
2. The mariculture wastewater recycling treatment system according to claim 1, wherein one or more of the primary solid-liquid separation device (2) and the plate-frame filtering device (3) is subjected to ultrasonic treatment.
3. The mariculture wastewater recycling and treating system according to claim 1, wherein the sludge outlet of the primary solid-liquid separation device (2) is connected to the plate-frame filtering device (3).
4. The mariculture wastewater recycling and treating system according to claim 1, wherein the nanofiltration device (5) is connected with the feeding device (8) through a concentrated solution outlet.
5. The mariculture wastewater recycling system according to claim 1, wherein the concentrated solution of the nanofiltration device (5) is sent to the ultrafiltration device (4) for cyclic concentration.
6. The mariculture wastewater recycling system according to claim 5, wherein the cyclic concentration is performed 5 to 18 times.
7. The mariculture wastewater recycling and treating system according to claim 1, wherein a purse net is arranged at the upper part of the aquaculture net cage (1), the bottom of the purse net is a conical bottom, a sludge outlet is arranged at the bottom of the conical bottom, and a water outlet pipe is arranged at the top of the conical bottom.
8. The mariculture wastewater recycling system according to claim 1, wherein the outlet of the frame filtering device (6) is connected to the micro-filtering device (3).
9. The mariculture wastewater recycling and processing system according to claim 1, wherein the primary solid-liquid separation device (2) is delivered to the earthworm cultivation device (7) or to an aerobic composting site.
10. The mariculture wastewater recycling and treating system according to claim 1, wherein a stirring device is arranged in the feeding device (8), and the concentrated solution of the nanofiltration device (5) is introduced into the feeding device (8) to be mixed with the bait.
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