CN110463646B - Can get rid of recirculating aquaculture system who remains antibiotic fast - Google Patents
Can get rid of recirculating aquaculture system who remains antibiotic fast Download PDFInfo
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Images
Classifications
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- 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
- A01K63/003—Aquaria; Terraria
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Marine Sciences & Fisheries (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Physical Water Treatments (AREA)
- Farming Of Fish And Shellfish (AREA)
Abstract
The invention relates to a recirculating aquaculture system capable of quickly removing residual antibiotics, which comprises an aquaculture unit (1), a mechanical filtering unit (2), an ultraviolet photolysis unit (3), an adsorption-biodegradation unit (4) and a water treatment unit (5); wherein, each unit is mutually connected to form an antibiotic administration circulation subsystem (P1) of the culture unit; a residual antibiotic ultraviolet photolysis circulation subsystem (P2); a residual antibiotic adsorption-biodegradation circulating subsystem (P3) and a systemic circulating culture circulating subsystem (P4). Compared with the prior art, the invention can realize scientific application of antibiotics to the recirculating aquaculture system and effective removal of residual antibiotics, and has obvious economic and environmental benefits.
Description
Technical Field
The invention relates to an aquaculture environment protection technology, in particular to a recirculating aquaculture system capable of quickly removing residual antibiotics.
Background
The development of the global aquaculture industry is rapid, and China accounts for more than 60% of the global aquaculture yield. The aquaculture water areas comprise three types of fresh water, seawater and salt water, the aquaculture types comprise pond culture, lake purse net culture, beach culture, shallow sea and deep sea net cage culture and the like, and the culture modes comprise extensive type, semi-intensive type, industrial type and the like. The industrial Aquaculture is also called a circulating water Aquaculture System (RAS for short), is a main development direction of the Aquaculture industry, and comprehensively uses advanced technology and industrialized means to control the living environment of cultured organisms and carry out scientific management, so that the limitation of natural resource conditions such as land, water and the like is eliminated, and the System is a high-density Aquaculture mode.
With the continuous increase of the culture scale and the culture density, the problems of water quality deterioration, diseases, environmental pollution and the like generated in the culture process are increasingly prominent. The application of antibiotics to control various bacterial diseases of aquaculture animals is still a popular countermeasure at home and abroad. At present, the antibiotics in the veterinary drugs for aquatic products allowed to be used in China have 22 varieties, and are mainly concentrated in 5 major categories: aminoglycosides (neomycin sulfate), tetracyclines (doxycycline hydrochloride), amidoalcohols (thiamphenicol, florfenicol, etc.), sulfonamides (sulfadiazine, sulfamethoxazole, sulfamethazine, sulfamonomethoxine sodium, etc.), quinolones (enrofloxacin, norfloxacin lactate, norfloxacin nicotinate, oxolinic acid, flumequine, etc.).
However, improper use of antibiotics causes many environmental problems such as antibiotic residues, resistance gene contamination, and the like. The variety of the cultured animals is various, the physiological characteristics are different, and the effect of the medicament and the metabolism rule of the medicament are greatly different; the traditional aquaculture mostly adopts a mixed culture mode as a main mode, and adopts group medicine receiving, so that accurate medicine feeding is difficult; and the aquaculture water is various, and the drug effect is influenced by the water environment and the physicochemical characteristics. The reasons cause the overdose of the aquaculture, the inevitable problem of antibiotic drug residue, the damage to the micro-ecological balance of the aquaculture animals and the problems of pathogenic bacteria drug resistance and resistance gene pollution.
At present, the removal methods of antibiotics are more, and comprise a biological method, a physical method and an oxidation method. At present, the functional microorganisms capable of degrading antibiotics mainly comprise two types of bacteria and fungi. Because the concentration of antibiotics in water environment is low, immobilized microorganisms are required for treatment, wherein the embedding method is the most studied immobilization method at present due to the advantages of small influence on microorganisms, high particle strength and the like. The physical method mainly comprises an adsorption method, a coagulation method, a membrane separation method and the like, wherein the adsorption method is widely used due to the advantages of simple operation, low cost, short time consumption and the like, and the most common adsorbent is activated carbon. The oxidation method mainly comprises chemical oxidation, photooxidation, electrochemical oxidation and ultrasonic oxidation. The photochemical oxidation method has the advantages of high degradation speed, good mineralization effect, mild reaction conditions, no special requirements on temperature, pressure and the like, simple treatment process, and suitability for treatment of organic pollutants difficult to biodegrade, and the antibiotics subjected to ultraviolet photolysis can relieve the inhibition of microorganisms and effectively improve the biodegradation rate of the microorganisms.
The recirculating aquaculture system is a closed system, antibiotics can be scientifically and accurately used according to the needs of cultured animals, but residual antibiotics in the system need to be quickly removed, otherwise, the functional bacterial activity of a water treatment unit of the circulating system is influenced, so that the water treatment capacity of the biofilter is reduced, and the water quality of the whole system is deteriorated. At present, an effective technical method for quickly removing residual antibiotics in a recirculating aquaculture system is still lacking.
Disclosure of Invention
The invention aims to provide a recirculating aquaculture system capable of quickly removing residual antibiotics, which realizes scientific application of antibiotics by the recirculating aquaculture system and effective removal of residual antibiotics in the system.
The purpose of the invention can be realized by the following technical scheme:
a recirculating aquaculture system capable of rapidly removing residual antibiotics comprises an aquaculture unit, a mechanical filtering unit, an ultraviolet photolysis unit, an adsorption-biodegradation unit and a water treatment unit; the operation of the mechanical filter unit is throughout the entire system operating cycle.
Wherein, the culture unit and the mechanical filtering unit are mutually connected to form an antibiotic administration circulation subsystem of the culture unit;
the ultraviolet photolysis unit, the culture unit and the mechanical filtering unit are sequentially connected to form a residual antibiotic ultraviolet photolysis circulation subsystem;
the adsorption-biodegradation unit, the culture unit and the mechanical filtering unit are sequentially connected to form a residual antibiotic adsorption-biodegradation circulating subsystem;
the water treatment unit, the ultraviolet photolysis unit, the culture unit and the mechanical filtering unit are sequentially connected to form a system circulation culture circulation subsystem.
Furthermore, an outlet of the culture unit in the culture unit antibiotic administration circulation subsystem is connected with an inlet of the mechanical filtering unit, an outlet of the mechanical filtering unit returns to be connected with the inlet of the culture unit through a first circulation pipeline, and a first valve is arranged on the first circulation pipeline;
an outlet of the mechanical filtering unit in the residual antibiotic ultraviolet photolysis circulating subsystem returns to an inlet of the ultraviolet photolysis unit through a second circulating pipeline, and a second valve is arranged on the second circulating pipeline;
the outlet of the mechanical filtering unit in the residual antibiotic adsorption-biodegradation circulating subsystem returns to the inlet of the adsorption-biodegradation unit through a third circulating pipeline, and a third valve is arranged on the third circulating pipeline;
the outlet of the mechanical filtering unit in the system circulating culture circulating subsystem returns to the inlet of the water treatment unit through a fourth circulating pipeline, and a fourth valve is arranged on the fourth circulating pipeline.
Furthermore, the mechanical filtering unit adopts a filtering column filled with a porous filter cotton substrate to filter the culture sludge.
Further, the size of the filter cotton substrate is 2-3 cm.
Further, the adsorption-biodegradation unit comprises a bed layer formed by mixing a high-efficiency adsorbent and immobilized biological filler.
Furthermore, the high-efficiency adsorbent is activated carbon or activated clay; the immobilized biological filler is embedded bacteria particles.
Further, the water treatment unit comprises one or more combinations of a biological filter, a denitrification device or aquatic plants.
Furthermore, the culture unit adopts fresh water culture or seawater culture.
Furthermore, the process running time of the antibiotic administration circulation subsystem of the culture unit is 3-6h, generally 4 h; the medication method comprises the following steps: antibiotics such as tetracycline or enrofloxacin and the like are mixed with baits and are put into the culture unit, and the running time of the antibiotic drug circulation subsystem of the culture unit can be adjusted according to the effect of the drugs on cultured animals;
the running time of the residual antibiotic ultraviolet photolysis circulating subsystem is 3-6h, generally 4h, the ultraviolet wavelength in the ultraviolet photolysis unit is 250-265nm, and the power is 40-80W;
the running time of the residual antibiotic adsorption-biodegradation circulating subsystem is 3-6 hours, generally 4 hours; residual antibiotics and intermediate products thereof in water are quickly removed through the adsorbent, and are gradually decomposed through microorganisms of the biological membrane, and the running time can be adjusted according to the actual adsorption effect;
the running time of the system circulating culture circulating subsystem is 10-16h, generally 12h, organic matters, ammonia nitrogen and other pollutants generated in the culture process are decomposed and converted, and accumulation of nitrate nitrogen and other substances of the system is controlled.
Furthermore, the operation period of the system is 1-3 days, generally 24 hours, and only the system circulating culture circulating subsystem is operated after the effect of removing antibiotics is achieved.
Furthermore, when the antibiotic administration circulation subsystem of the culture unit is started, the first valve is opened, and other valves are closed;
when the residual antibiotic ultraviolet photolysis circulation subsystem is started, the second valve is opened, and other valves are closed;
when the residual antibiotic adsorption-biodegradation circulating subsystem is started, the third valve is opened, and other valves are closed;
and when the system circulating culture circulating subsystem is started, the fourth valve is opened, and other valves are closed.
The valves are switched by automatic control.
Compared with the prior art, the invention has the following advantages:
(1) the residual antibiotics are effectively removed, and the circulating water culture system is scientifically used for the antibiotics;
(2) removing residual antibiotics in a multi-step manner in a parallel connection manner, wherein subsystems are not affected mutually;
(3) natural substances such as embedded bacteria, aquatic plants and the like are used to participate in the whole process, so that the method has obvious economic benefit and environmental benefit.
Drawings
FIG. 1 is a process flow diagram of the system of the present invention;
FIG. 2 is a flow chart of the process of example 1;
FIG. 3 is a flowchart of the process of example 2;
the reference numbers in the figures indicate: the system comprises a culture unit 1, a mechanical filtering unit 2, an ultraviolet photolysis unit 3, an adsorption-biodegradation unit 4, a water treatment unit 5, a first valve 6, a second valve 7, a third valve 8, a fourth valve 9, a culture unit antibiotic drug circulation subsystem P1, a residual antibiotic ultraviolet photolysis circulation subsystem P2, a residual antibiotic adsorption-biodegradation circulation subsystem P3 and a system circulation culture circulation subsystem P4.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
A recirculating aquaculture system capable of rapidly removing residual antibiotics, as shown in fig. 2, comprising;
the cultivation unit is a seawater cultivation, the antibiotic medicine is enrofloxacin, and the medication process comprises a cultivation unit 1 and a mechanical filtration unit 2 which are connected in sequence; the ultraviolet photolysis comprises a culture unit 1, a mechanical filtering unit 2 and an ultraviolet photolysis unit 3 which are mutually connected to form a cycle; the adsorption-biodegradation comprises a culture unit 1, a mechanical filtering unit 2 and an adsorption-biodegradation unit 4 which are connected with each other to form a cycle; the system circulation culture comprises a culture unit 1 and a water treatment unit 5 which are connected with each other to form a circulation. The water treatment unit 5 includes a biological filter and a denitrification device. The adsorption-biodegradation unit 4 is a bed layer consisting of activated carbon and embedded bacteria.
A first valve 6 is arranged between the outlet of the mechanical filtering unit 2 and the inlet of the culture unit 1; a second valve 7 is arranged between the outlet of the mechanical filtering unit 2 and the inlet of the ultraviolet photolysis unit 3; a fourth valve 9 is arranged between the outlet of the mechanical filtering unit 2 and the inlet of the water treatment unit 5; a third valve 8 is arranged between the outlet of the mechanical filtration unit 2 and the inlet of the adsorption-biodegradation unit 4.
The medicine taking period is 24h, and when each process runs, the corresponding valve is opened, other process control valves are closed, and automatic control is adopted for switching. The mechanical filtering unit adopts a filtering column taking a 2-3cm filtering cotton square as a substrate to filter the culture sludge. The enrofloxacin administration time of the culture unit is 4 hours, the administration mode is mixed with bait, the ultraviolet photolysis time is 4 hours, the ultraviolet lamp wavelength is 254nm, the power is 40W, the active carbon-embedded bacteria unit is used, the retention time is 4 hours, a bed layer formed by mixing granular active carbon and embedded bacteria granules is used, the system circulating culture operation time is 12 hours, a biological filter is adopted to convert organic matters and ammonia nitrogen, and a denitrification unit is adopted to remove the accumulation of nitrate nitrogen of the system; the administration period can last for several days, and the system circulation breeding mode is operated after the administration effect is achieved.
Example 2
A recirculating aquaculture system capable of rapidly removing residual antibiotics, as shown in fig. 3, comprising;
the culture unit is used for freshwater culture, the antibiotic drug is tetracycline, and the medication process comprises a culture unit 1 and a mechanical filtration unit 2 which are sequentially connected; the ultraviolet photolysis comprises a culture unit 1, a mechanical filtering unit 2 and an ultraviolet photolysis unit 3 which are mutually connected to form a cycle; the adsorption-biodegradation comprises a culture unit 1, a mechanical filtering unit 2 and an adsorption-biodegradation unit 4 which are connected with each other to form a cycle; the system circulation culture comprises a culture unit 1 and a water treatment unit 5 which are connected with each other to form a circulation. The water treatment unit 5 includes a biofilter and aquatic plants. The adsorption-biodegradation unit 4 is a bed layer consisting of activated carbon and embedded bacteria.
A first valve 6 is arranged between the outlet of the mechanical filtering unit 2 and the inlet of the culture unit 1; a second valve 7 is arranged between the outlet of the mechanical filtering unit 2 and the inlet of the ultraviolet photolysis unit 3; a fourth valve 9 is arranged between the outlet of the mechanical filtering unit 2 and the inlet of the water treatment unit 5; a third valve 8 is arranged between the outlet of the mechanical filtration unit 2 and the inlet of the adsorption-biodegradation unit 4.
The medication period is 24h, when each process runs, the corresponding valve is opened, other process control valves are closed, and automatic control is adopted for switching; the mechanical filtering unit adopts a filtering column consisting of 2-3cm filtering cotton squares to filter the culture sludge; the tetracycline administration time of the culture unit is 4 hours, and the administration mode is mixed with bait; the photolysis time of the ultraviolet light is 4h, the wavelength of the ultraviolet light is 254nm, and the power is 40W; an active carbon-embedded bacteria unit with the retention time of 4 hours, and a bed layer formed by mixing granular active carbon and embedded bacteria particles; the operation time of the system circulating culture is 12h, a biological filter is adopted to convert organic matters and ammonia nitrogen, and aquatic plants (leafy vegetables and the like) are adopted to absorb nutrient elements such as nitrogen nitrate, phosphorus and the like in water; the administration period can last for several days, and the system circulation breeding mode is operated after the administration effect is achieved.
Example 3
A recirculating aquaculture system capable of rapidly removing residual antibiotics is disclosed, and referring to fig. 1, the recirculating aquaculture system comprises an aquaculture unit 1, a mechanical filtering unit 2, an ultraviolet photolysis unit 3, an adsorption-biodegradation unit 4 and a water treatment unit 5; the operation of the mechanical filter unit 2 is throughout the entire system operating cycle. The mechanical filtering unit 2 is filled with a filtering column of a porous filtering cotton substrate with the length of 2-3cm, and the breeding sludge is filtered. Activated carbon and embedded bacteria particles are included in the adsorption-biodegradation unit 4. The water treatment unit 5 includes a biofilter, a denitrification device, and aquatic plants. The culture unit 1 adopts fresh water culture.
Wherein, the culture unit 1 and the mechanical filter unit 2 are mutually connected to form a culture unit antibiotic administration circulation subsystem P1; the outlet of the culture unit 1 is connected with the inlet of the mechanical filter unit 2, the outlet of the mechanical filter unit 2 is returned to be connected with the inlet of the culture unit 1 through a first circulating pipeline, and a first valve 6 is arranged on the first circulating pipeline;
the ultraviolet photolysis unit 3, the culture unit 1 and the mechanical filtering unit 2 are sequentially connected to form a residual antibiotic ultraviolet photolysis circulation subsystem P2; the outlet of the mechanical filtering unit 2 returns to the inlet of the ultraviolet photolysis unit 3 through a second circulating pipeline, and a second valve 7 is arranged on the second circulating pipeline;
the adsorption-biodegradation unit 4, the culture unit 1 and the mechanical filtering unit 2 are sequentially connected to form a residual antibiotic adsorption-biodegradation circulating subsystem P3; the outlet of the mechanical filtering unit 2 returns to the inlet of the adsorption-biodegradation unit 4 through a third circulating pipeline, and a third valve 8 is arranged on the third circulating pipeline;
the water treatment unit 5, the ultraviolet photolysis unit 3, the culture unit 1 and the mechanical filter unit 2 are sequentially connected to form a system circulation culture circulation subsystem P4; the outlet of the mechanical filtering unit 2 returns to the inlet of the water treatment unit 5 through a fourth circulating pipeline, and a fourth valve 9 is arranged on the fourth circulating pipeline.
The running time of the process of the antibiotic administration circulation subsystem P1 of the culture unit is 3 h; when the subsystem is started, the first valve 6 is opened, and other valves are closed; the medication method comprises the following steps: the tetracycline and the bait are mixed and put into the culture unit 1, and the running time of the antibiotic administration circulation subsystem P1 of the culture unit can be adjusted according to the effect of the medicine on the cultured animals;
the running time of the residual antibiotic ultraviolet photolysis circulation subsystem P2 is 3h, when the subsystem is started, the second valve 7 is opened, and other valves are closed; the ultraviolet wavelength in the ultraviolet photolysis unit 3 is 250-265nm, and the power is 40W;
the running time of the residual antibiotic adsorption-biodegradation circulating subsystem P3 is 3-6 h; when the subsystem is started, the third valve 8 is opened, and other valves are closed; residual antibiotics and intermediate products thereof in water are quickly removed through the adsorbent, and are gradually decomposed through microorganisms of the biological membrane, and the running time can be adjusted according to the actual adsorption effect;
the running time of the system circulating culture circulating subsystem P4 is 10h, and when the subsystem is started, the fourth valve 9 is opened, and other valves are closed; decomposing and converting pollutants such as organic matters, ammonia nitrogen and the like generated in the culture process, and controlling the accumulation of substances such as nitrate nitrogen and the like in the system.
Furthermore, the operation period of the system is 1 day, and only the system circulating culture circulating subsystem P4 is operated after the effect of removing antibiotics is achieved. The valves are switched by automatic control.
Example 4
A recirculating aquaculture system capable of rapidly removing residual antibiotics is disclosed, and referring to fig. 1, the recirculating aquaculture system comprises an aquaculture unit 1, a mechanical filtering unit 2, an ultraviolet photolysis unit 3, an adsorption-biodegradation unit 4 and a water treatment unit 5; the operation of the mechanical filter unit 2 is throughout the entire system operating cycle. The mechanical filtering unit 2 is filled with a filtering column of a porous filtering cotton substrate with the length of 2-3cm, and the breeding sludge is filtered. Activated clay and embedding bacteria particles are contained in the adsorption-biodegradation unit 4. The water treatment unit 5 includes a biofilter, a denitrification device, and aquatic plants. The culture unit 1 adopts seawater culture.
Wherein, the culture unit 1 and the mechanical filter unit 2 are mutually connected to form a culture unit antibiotic administration circulation subsystem P1; the outlet of the culture unit 1 is connected with the inlet of the mechanical filter unit 2, the outlet of the mechanical filter unit 2 is returned to be connected with the inlet of the culture unit 1 through a first circulating pipeline, and a first valve 6 is arranged on the first circulating pipeline;
the ultraviolet photolysis unit 3, the culture unit 1 and the mechanical filtering unit 2 are sequentially connected to form a residual antibiotic ultraviolet photolysis circulation subsystem P2; the outlet of the mechanical filtering unit 2 returns to the inlet of the ultraviolet photolysis unit 3 through a second circulating pipeline, and a second valve 7 is arranged on the second circulating pipeline;
the adsorption-biodegradation unit 4, the culture unit 1 and the mechanical filtering unit 2 are sequentially connected to form a residual antibiotic adsorption-biodegradation circulating subsystem P3; the outlet of the mechanical filtering unit 2 returns to the inlet of the adsorption-biodegradation unit 4 through a third circulating pipeline, and a third valve 8 is arranged on the third circulating pipeline;
the water treatment unit 5, the ultraviolet photolysis unit 3, the culture unit 1 and the mechanical filter unit 2 are sequentially connected to form a system circulation culture circulation subsystem P4; the outlet of the mechanical filtering unit 2 returns to the inlet of the water treatment unit 5 through a fourth circulating pipeline, and a fourth valve 9 is arranged on the fourth circulating pipeline.
The running time of the antibiotic administration circulation subsystem P1 process of the culture unit is 6 h; when the subsystem is started, the first valve 6 is opened, and other valves are closed; the medication method comprises the following steps: mixing enrofloxacin and bait, putting the mixture into the culture unit 1, wherein the running time of an antibiotic drug application circulation subsystem P1 of the culture unit can be adjusted according to the effect of the drug on cultured animals;
the running time of the residual antibiotic ultraviolet photolysis circulation subsystem P2 is 6h, when the subsystem is started, the second valve 7 is opened, and other valves are closed; the ultraviolet wavelength in the ultraviolet photolysis unit 3 is 250-265nm, and the power is 80W;
the running time of the residual antibiotic adsorption-biodegradation circulating subsystem P3 is 6 h; when the subsystem is started, the third valve 8 is opened, and other valves are closed; residual antibiotics and intermediate products thereof in water are quickly removed through the adsorbent, and are gradually decomposed through microorganisms of the biological membrane, and the running time can be adjusted according to the actual adsorption effect;
the running time of the system circulating culture circulating subsystem P4 is 16h, and when the subsystem is started, the fourth valve 9 is opened, and other valves are closed; decomposing and converting pollutants such as organic matters, ammonia nitrogen and the like generated in the culture process, and controlling the accumulation of substances such as nitrate nitrogen and the like in the system.
Furthermore, the operation period of the system is 3 days, and only the system circulating culture circulating subsystem P4 is operated after the effect of removing antibiotics is achieved. The valves are switched by automatic control.
Claims (7)
1. A recirculating aquaculture system capable of rapidly removing residual antibiotics is characterized by comprising an aquaculture unit (1), a mechanical filtering unit (2), an ultraviolet photolysis unit (3), an adsorption-biodegradation unit (4) and a water treatment unit (5);
wherein the culture unit (1) and the mechanical filter unit (2) are mutually connected to form a culture unit antibiotic administration circulation subsystem (P1); an outlet of a culture unit (1) in the culture unit antibiotic drug circulation subsystem (P1) is connected with an inlet of a mechanical filter unit (2), an outlet of the mechanical filter unit (2) is returned to be connected with the inlet of the culture unit (1) through a first circulation pipeline, and a first valve (6) is arranged on the first circulation pipeline; when the antibiotic administration circulation subsystem (P1) of the culture unit is started, a first valve (6) is opened, and other valves are closed; the process running time of the antibiotic administration circulation subsystem (P1) of the culture unit is 3-6 h;
the ultraviolet photolysis unit (3), the culture unit (1) and the mechanical filtering unit (2) are sequentially connected to form a residual antibiotic ultraviolet photolysis circulation subsystem (P2); an outlet of the mechanical filtering unit (2) in the residual antibiotic ultraviolet photolysis circulating subsystem (P2) returns to an inlet of the ultraviolet photolysis unit (3) through a second circulating pipeline, and a second valve (7) is arranged on the second circulating pipeline; when the residual antibiotic ultraviolet photolysis circulation subsystem (P2) is started, a second valve (7) is opened, and other valves are closed; the running time of the residual antibiotic ultraviolet photolysis circulation subsystem (P2) is 3-6 h; the adsorption-biodegradation unit (4), the culture unit (1) and the mechanical filtering unit (2) are sequentially connected to form a residual antibiotic adsorption-biodegradation circulating subsystem (P3); the outlet of the mechanical filtering unit (2) in the residual antibiotic adsorption-biodegradation circulating subsystem (P3) returns to the inlet of the adsorption-biodegradation unit (4) through a third circulating pipeline, and a third valve (8) is arranged on the third circulating pipeline; when the residual antibiotic adsorption-biodegradation circulating subsystem (P3) is started, a third valve (8) is opened, other valves are closed, and the running time of the residual antibiotic adsorption-biodegradation circulating subsystem (P3) is 3-6 h;
the water treatment unit (5), the ultraviolet photolysis unit (3), the culture unit (1) and the mechanical filtering unit (2) are sequentially connected to form a system circulating culture circulation subsystem (P4); the outlet of the mechanical filtering unit (2) in the system circulating culture circulating subsystem (P4) is returned to the inlet of the water treatment unit (5) through a fourth circulating pipeline, and a fourth valve (9) is arranged on the fourth circulating pipeline; when the system circulating culture circulating subsystem (P4) is started, the fourth valve (9) is opened, other valves are closed, and the running time of the system circulating culture circulating subsystem (P4) is 10-16 h;
the operation period of the system is 1-3 days, and only the system circulating culture circulation subsystem (P4) is operated after the effect of removing antibiotics is achieved.
2. The recirculating aquaculture system with rapid removal of residual antibiotics of claim 1, wherein said mechanical filter unit (2) employs a filter column filled with a porous filter cotton matrix.
3. The recirculating aquaculture system for rapid removal of residual antibiotics as claimed in claim 1, wherein said adsorption-biodegradation unit (4) comprises a bed of a high efficiency adsorbent mixed with immobilized biological filler.
4. The recirculating aquaculture system for rapidly removing residual antibiotics as claimed in claim 3, wherein said high efficiency adsorbent is activated carbon or activated clay; the immobilized biological filler is embedded bacteria particles.
5. A recirculating aquaculture system with rapid removal of residual antibiotics as claimed in claim 1 wherein said water treatment unit (5) comprises one or more combinations of biofilters, denitrification devices or aquatic plants.
6. The recirculating aquaculture system for rapid removal of residual antibiotics of claim 1, wherein said aquaculture unit (1) is either freshwater aquaculture or marine aquaculture.
7. The recirculating aquaculture system as claimed in claim 1, wherein the UV photolysis unit (3) has a UV wavelength of 250-265nm and a power of 40-80W.
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