CN114873862B - Aquaculture wastewater treatment system - Google Patents
Aquaculture wastewater treatment system Download PDFInfo
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- CN114873862B CN114873862B CN202210611268.3A CN202210611268A CN114873862B CN 114873862 B CN114873862 B CN 114873862B CN 202210611268 A CN202210611268 A CN 202210611268A CN 114873862 B CN114873862 B CN 114873862B
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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
- A01K63/00—Receptacles for live fish, e.g. aquaria; Terraria
- A01K63/04—Arrangements for treating water specially adapted to receptacles for live fish
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
- C02F3/327—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae characterised by animals and plants
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Marine Sciences & Fisheries (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Physical Water Treatments (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses an aquaculture wastewater treatment system, relates to the technical field of wastewater treatment, and solves the technical problems of poor aquaculture wastewater treatment effect, single treatment target, low automation degree and water resource waste caused by direct discharge of treatment tail water at present; comprises a culture pond, an adjusting pond, an air floatation pond, a composite flow wetland, an ozone aeration pond, an ecological purification pond and a water storage pond which are connected in sequence; the air floatation tank and the composite flow wetland can effectively remove algae, nitrogen, phosphorus and other pollutants in the aquaculture wastewater, and the ozone aeration tank and the ecological purification pond can reduce the content of antibiotics in water, kill pathogenic bacteria in water, purify water and improve water quality; the regulating tank and the water storage pond are internally provided with monitoring systems for monitoring water quality and algae density of water inlet and outlet, and the circulating pipelines for water inlet and outlet are regulated and controlled according to the set target water quality and algae density, so that the automatic operation of higher degree is realized, the use cost is reduced, the water resource is saved, and the environmental system of surrounding water is friendly.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an aquaculture wastewater treatment system.
Background
With the continuous increase of the cultivation scale and the large-scale use of antibiotics, the discharge amount of cultivation wastewater and the pollution concentration are remarkably increased. Most of the aquaculture wastewater belongs to slightly polluted water, the pollution load is relatively low, the treatment is relatively easy, but some aquaculture is sensitive to water quality requirements, especially to removal of nitrogen, phosphorus, antibiotics and algae in water, a mature and complete treatment process is needed, and the aims of low consumption, high efficiency and recycling are fulfilled.
At present, aquaculture wastewater mainly comprises physical (precipitation filtration), chemical (oxidative decomposition), biological (microbial treatment), ecological (artificial wetland, stabilization pond and the like) treatment technologies, such as patent technologies with the authorized bulletin number of CN212368186U and the publication number of CN113716818A, and the aquaculture wastewater can remove pollutants such as nitrogen and phosphorus in the wastewater, has high resource utilization rate and has certain economic benefit. However, the technology has the problems of poor treatment effect, single treatment target, low automation degree, water resource waste caused by directly discharging treatment tail water and the like. Based on the defects, the invention provides an aquaculture wastewater treatment system.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides an aquaculture wastewater treatment system, which adopts comprehensive and strengthening technology, simultaneously utilizes intelligent on-line monitoring technology to automatically adjust water inlet and outlet circulation and discharge according to the water inlet and outlet quality and algae density detection result, and realizes stable water quality up to standard and recycling.
To achieve the above object, an embodiment according to a first aspect of the present invention provides an aquaculture wastewater treatment system, including a culture pond, a regulating tank, an air floatation tank, a composite flow wetland, an ozone aeration tank, an ecological purification pond and a water storage pond, which are sequentially connected;
the wastewater discharged from the culture pond flows into the regulating tank after water garbage is intercepted by the blocking net, water quality and water quantity are stabilized, and then the wastewater is discharged into the air floatation tank, and a large amount of micro bubbles are released by the air floatation tank and are adhered to particles in water after coagulation by the coagulant, so that the whole specific gravity of the particles is smaller than that of water, and the particles float up to the water surface and are scraped by the slag scraping device; the floatation tank has good removal effect on algae and nitrogen and phosphorus, and has the advantages of quick response, low treatment cost, small occupied area and simple maintenance;
the treated wastewater flows into a composite flow wetland, is intercepted, filtered and adsorbed by wetland filler, aquatic plants and attached microorganisms, and is discharged into an ozone aeration tank; ozone has strong oxidizing property, can well remove antibiotics such as beta-lactam, macrolide, chloramphenicol and the like, kills pathogenic bacteria in water, has short reaction time, no secondary pollution and simple process, and can enrich oxygen in water;
the tail water after ozone oxidation flows into an ecological purifying pond, and is discharged into a water storage pond after the residual antibiotics and nitrogen and phosphorus pollutants are further absorbed by aquatic plants; the water storage pond is used for storing the tail water after treatment;
wherein, the tail end of the pool and the front end of the regulating tank are provided with return pipelines; the return pipeline is used for returning tail water of the water storage pond to the regulating tank; a first pump station is arranged at one end, close to the water storage pond, of the return pipeline; the first pump station is used for lifting tail water of the water storage pond to flow back to the regulating tank; the other end of the water storage pond is provided with a second pump station, and the second pump station is used for externally supplying water to tail water of the water storage pond;
the regulating tank and the water storage pond are internally provided with monitoring systems, and the monitoring systems are used for monitoring water quality and algae density of inlet water and outlet water and regulating and controlling a water inlet and outlet circulating pipeline according to the set target water quality and algae density; wherein the water inlet and outlet flow pipeline is controlled by an electromagnetic valve.
Further, the monitoring system comprises a water quality detection sensor, an algae density automatic detector, an information transmission module and a data analysis processing module, wherein the water quality detection sensor and the algae density automatic detector are respectively used for monitoring the water quality of water entering and exiting and the algae density condition in real time, and monitoring data are transmitted to the data analysis processing module through the information transmission module.
Further, the data analysis processing module is used for controlling the water inlet and outlet circulation pipelines after analyzing the monitoring data, and the specific control steps are as follows:
when the water quality and algae density content of the inlet water of the regulating tank are lower than the set minimum value of the inlet water, the waste water is directly discharged into the composite flow wetland;
when the water quality and algae density content of the inlet water of the regulating tank are lower than the set water inlet highest value and higher than the set water inlet lowest value, the wastewater enters the air floatation tank, and the air floatation tank starts to operate;
when one of the water quality and the algae density content of the inlet water of the regulating tank is higher than the set water inlet highest value, the wastewater enters the air floatation tank, the air floatation tank starts to operate, and meanwhile, the first pump station starts to lift and reflux tail water of the water storage tank to the regulating tank so as to dilute the high-concentration inlet water;
when the water quality and algae density content of the effluent of the water storage pond are higher than the set water outlet minimum value, the first pump station is started, and tail water is returned to the regulating tank for retreatment.
Further, the culture pond, the regulating tank, the air floatation tank, the composite flow wetland, the ozone aeration tank, the ecological purification pond and the water storage pond are connected in series through an ecological ditch, and the positions of the culture pond, the regulating tank, the air floatation tank, the composite flow wetland, the ozone aeration tank, the ecological purification pond and the water storage pond are gradually reduced.
Further, a blocking net is arranged at the water inlet of the regulating tank and used for blocking the water surface garbage discharged from the culture pond.
Further, the air floatation tank is a pressurized dissolved air floatation tank, and the water treatment amount is determined according to the wastewater discharge scale of the culture pond.
Further, the composite flow wetland is a composite vertical flow wetland, the aspect ratio is 3:1, and the hydraulic retention time is 2 days; the composite flow wetland filler comprises gravel, zeolite and ceramsite from bottom to top in sequence, wherein the depth is 1:1:4, the particle size of the gravel is 2-5cm, the particle size of the zeolite is 1-3cm, and the particle size of the ceramsite is 1-3cm; the aquatic plants on the composite flow wetland are two or more of canna, calamus, typha, flos lonicerae and Graptopetalum album, and the planting density is 9 plants per square meter-25 plants per square meter.
Further, the ozone aeration tank is of a fully-closed structure, the depth of the tank is not less than 3m, the ozone adding amount is 1.5-2.0mg/L, and the hydraulic retention time is not less than 5min.
Further, aquatic plants are planted in the ecological purification pond, the ecological purification pond comprises emergent aquatic plants, submerged plants, floating leaf plants and ecological floating islands, the planting areas of the emergent aquatic plants, the submerged plants and the floating leaf plants are 3:2:1, and the total planting area of the aquatic plants is 60% of the water area of the ecological purification pond;
the emergent aquatic plants comprise one or a combination of several of canna, calamus, pennisetum hydridum and reed;
the submerged plant comprises one or more of herba Sonchi Oleracei, sargassum horneri, and herba Eichhorniae;
the floating leaf plant comprises one or a combination of more of lotus, water lily and Nuphar;
the ecological floating island is fixed by inhaul cable, and the planted plants are one or a combination of a plurality of balata, pennisetum hydridum and ryegrass.
Further, the impounded pond provides three drainage modes; the first is that the water is directly discharged to natural water after reaching the standard; the second is that after the water quality reaches the standard, the water is lifted by a second pump station and is used for recycling the cultivation water or irrigating farmlands; thirdly, if the water quality does not reach the standard, the water is lifted and returned to the regulating tank for reprocessing through the first pump station, or the water inlet exceeds the standard and is used for refluxing and diluting the water inlet, so that the subsequent processing load is reduced.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts a physicochemical-ecological compound method, the air floatation tank and the compound flow wetland can effectively remove algae, nitrogen, phosphorus and other pollutants in the aquaculture wastewater, the ozone aeration tank and the ecological purification pond can reduce the content of antibiotics in water and kill pathogenic bacteria in water, and the physicochemical and ecological treatment process combination can effectively remove various pollutants such as nitrogen, phosphorus pollutants, algae, antibiotics, pathogenic bacteria and the like in the aquaculture wastewater, purify water body and improve water quality; meanwhile, the monitoring system can realize higher-degree automatic operation, realize circulating circulation of water inlet and outlet, ensure that the water quality of the water outlet reaches the standard and reduce the use cost; the tail water after reaching the standard can be reused, water resources are saved, and the method is friendly to surrounding water ecological systems.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of an aquaculture wastewater treatment system according to the present invention.
FIG. 2 is a schematic diagram of an aquaculture wastewater treatment system according to the present invention.
In the figure: 1. a cultivation pond; 2. an adjusting tank; 3. an air floatation tank; 4. a composite flow wetland; 5. an ozone aeration tank; 6. an ecological purifying pond; 7. a water storage pond; 8. a monitoring system; 9. a second pump station; 10. a first pump station; 11. and a return line.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide the aquaculture wastewater treatment system which has good treatment effect, multiple pollutant removal types and high automation degree and can realize water resource reuse.
As shown in fig. 1 to 2, an aquaculture wastewater treatment system comprises a culture pond 1, a regulating pond 2, an air floatation pond 3, a composite flow wetland 4, an ozone aeration pond 5, an ecological purification pond 6 and a water storage pond 7 which are sequentially connected; wherein, the tail end of the water storage pond 7 and the front end of the regulating tank 2 are provided with a return pipeline 11; a first pump station 10 is arranged at one end, close to the water storage pond 7, of the return pipeline 11; the first pump station 10 is used for lifting tail water of the water storage pond 7 to flow back to the regulating tank 2; the other end of the water storage pond 7 is provided with a second pump station 9, and the second pump station 9 is used for externally supplying water to the tail water of the water storage pond 7;
a monitoring system 8 is arranged in the regulating tank 2 and the water storage pond 7 and is used for monitoring the water quality and the algae density of the inlet water and the outlet water, and regulating and controlling the flow pipeline of the inlet water and the outlet water according to the set target water quality and the algae density;
the monitoring system 8 comprises a water quality detection sensor, an algae density automatic detector, an information transmission module and a data analysis processing module, wherein the water quality detection sensor and the algae density automatic detector are respectively used for monitoring the water quality of water entering and exiting and the algae density condition in real time, and transmitting monitoring data to the data analysis processing module through the information transmission module;
the data analysis processing module analyzes the monitoring data and regulates and controls the water inlet and outlet circulation pipelines, wherein the water inlet and outlet circulation pipelines are controlled by electromagnetic valves; the specific analysis steps are as follows:
when the water quality and algae density content of the inlet water of the regulating tank 2 are lower than the set minimum value of the inlet water, the waste water is directly discharged into the composite flow wetland 4;
when the water quality and algae density content of the inlet water of the regulating tank 2 are lower than the set water inlet highest value and higher than the set water inlet lowest value, the wastewater enters the air floatation tank 3, and the air floatation tank 3 starts to operate;
when one of the water quality and algae density content of the inlet water of the regulating tank 2 is higher than a set water inlet highest value, the wastewater enters the air floatation tank 3, the air floatation tank 3 starts to operate, and meanwhile, the first pump station 10 starts to lift and reflux tail water of the water storage pond 7 to the regulating tank 2 so as to dilute high-concentration inlet water;
when the water quality and algae density content of the effluent of the water storage pond 7 are higher than the set water outlet minimum value, the first pump station 10 is started, and tail water is returned to the regulating tank 2 for retreatment;
the cultivation pond 1, the regulating tank 2, the air floatation tank 3, the composite flow wetland 4, the ozone aeration tank 5, the ecological purification pond 6 and the water storage pond 7 are connected in series through ecological ditches, and the positions of the cultivation pond, the regulating tank, the air floatation tank, the composite flow wetland and the ozone aeration tank are gradually reduced;
a blocking net is arranged at the water inlet of the regulating tank 2 and used for intercepting the water surface garbage discharged from the culture pond 1;
the air floatation tank 3 is a pressurized dissolved air floatation tank 3, and the treated water quantity is determined according to the wastewater discharge scale of the culture pond 1; the air floatation tank can be replaced by devices such as magnetic coagulation equipment, MBR equipment and the like;
the composite flow wetland 4 is a composite vertical flow wetland, the aspect ratio is 3:1, and the hydraulic retention time is 2 days; the composite flow wetland 4 filler comprises gravel, zeolite and ceramsite from bottom to top in sequence, wherein the depth is 1:1:4, the particle size of the gravel is 2-5cm, the particle size of the zeolite is 1-3cm, and the particle size of the ceramsite is 1-3cm;
the aquatic plants on the composite flow wetland 4 are two or more of canna, calamus, typha, flos lonicerae and Graptopetalum album, and the planting density is 9 plants per square meter-25 plants per square meter;
the ozone aeration tank 5 is of a fully-closed structure, the depth of the tank is not less than 3m, the ozone adding amount is 1.5-2.0mg/L, and the hydraulic retention time is not less than 5min;
aquatic plants are planted in the ecological purification pond 6, the aquatic plants comprise emergent aquatic plants, submerged plants, floating leaf plants and ecological floating islands, the planting areas of the emergent aquatic plants, the submerged plants and the floating leaf plants are 3:2:1, and the total planting area of the aquatic plants is 60% of the area of the water area of the ecological purification pond 6;
the emergent aquatic plants comprise one or a combination of several of canna, calamus, pennisetum hydridum and reed;
the submerged plant comprises one or more of herba Sonchi Oleracei, sargassum horneri, and herba Eichhorniae;
the floating leaf plant comprises one or a combination of more of lotus, water lily and Nuphar;
the ecological floating island is of a dragline fixed type, and the planted plants are one or a combination of a plurality of balata, pennisetum hydridum and ryegrass;
the water storage pond 7 is used for storing the treated tail water;
the return pipeline 11 is used for returning tail water of the water storage pond 7 to the regulating pond 2;
a concrete implementation method of an aquaculture wastewater treatment system, which comprises the following steps:
the wastewater discharged by the culture pond 1 flows into the regulating tank 2 after water garbage is intercepted by the blocking net, water quality and water quantity are stabilized, and then the wastewater is discharged into the air floatation tank 3, and the air floatation tank 3 is used for adhering a large amount of micro bubbles to particles in water after coagulation by the coagulant, so that the whole specific gravity of the particles is smaller than that of water and floats to the water surface, the particles are scraped by the slag scraping device, the air floatation tank 3 has good removal effect on algae and nitrogen and phosphorus, and the wastewater treatment device has the advantages of quick response, low treatment cost, small occupied area and simple maintenance;
the treated wastewater flows into a composite flow wetland 4, is filtered through interception of wetland filler, aquatic plants and attached microorganisms, is adsorbed by impurities and is discharged into an ozone aeration tank 5, ozone has strong oxidizing property, can well remove antibiotics such as beta-lactam, macrolide, chloramphenicol and the like and kill pathogenic bacteria in water, has short reaction time, no secondary pollution and simple process, and can enrich oxygen in water;
the tail water after ozone oxidation flows into an ecological purifying pond 6, aquatic plants with better absorption effect on antibiotics are planted in the ecological purifying pond 6, and the aquatic plants further absorb residual antibiotics, nitrogen, phosphorus and other pollutants and then discharge the residual antibiotics, nitrogen, phosphorus and other pollutants into a water storage pond 7, wherein the water storage pond 7 is used for storing the tail water after treatment.
The water storage pond 7 provides three discharge modes, namely, the first is that the water is directly discharged to natural water after reaching the standard; the second is that after the water quality reaches the standard, the water is lifted by a second pump station 9 and is used for recycling the cultivation water or irrigating farmlands; thirdly, if the water quality does not reach the standard, the water is lifted by the first pump station 10 to flow back to the regulating tank 2 and then treated again, or the water inflow exceeds the standard and is used for flowing back and diluting the water inflow, so that the subsequent treatment load is reduced.
The invention adopts a physicochemical-ecological compound method, the air floatation tank 3 and the compound flow wetland 4 can effectively remove algae, nitrogen, phosphorus and other pollutants in the aquaculture wastewater, the ozone aeration tank 5 and the ecological purification pond 6 can reduce the antibiotic content in water and kill pathogenic bacteria in water, and the physicochemical and ecological treatment processes can effectively remove various pollutants such as nitrogen, phosphorus pollutants, algae, antibiotics, pathogenic bacteria and the like in the aquaculture wastewater, purify the water body and improve the water quality; meanwhile, the monitoring system 8 can realize higher-degree automatic operation, realize circulating circulation of water inlet and outlet, ensure that the water quality of the water outlet reaches the standard and reduce the use cost; the tail water after reaching the standard can be reused, water resources are saved, and the method is friendly to surrounding water ecological systems.
The working principle of the invention is as follows:
the aquaculture wastewater treatment system comprises a culture pond 1, a regulating tank 2, an air floatation tank 3, a composite flow wetland 4, an ozone aeration tank 5, an ecological purification pond 6 and a water storage pond 7 which are sequentially connected when in operation; the wastewater discharged from the culture pond 1 is intercepted by a blocking net and flows into an adjusting pond 2, the water quality and the water quantity are stabilized, the wastewater is discharged into an air floatation pond 3, a large amount of micro bubbles are released by the air floatation pond 3 and are adhered to particles in water after coagulation by a coagulant, the whole specific gravity of the particles is smaller than that of water and is lifted to the water surface, the wastewater is scraped by a slag scraping device, the treated wastewater flows into a composite flow wetland 4, the wastewater is intercepted, filtered and adsorbed by wetland fillers, aquatic plants and attached microorganisms and discharged into an ozone aeration pond 5, the tail water after ozone oxidation flows into an ecological purifying pond 6, the water storage pond 7 is used for storing the treated tail water after further absorbing residual antibiotics, nitrogen, phosphorus and other pollutants by the aquatic plants;
a monitoring system 8 is arranged in the regulating tank 2 and the water storage pond 7 and is used for monitoring the water quality and the algae density of the inlet water and the outlet water, and regulating and controlling the flow pipeline of the inlet water and the outlet water according to the set target water quality and the algae density; when the water quality and algae density content of the inlet water of the regulating tank 2 are lower than the set minimum value of the inlet water, the waste water is directly discharged into the composite flow wetland 4; when the water quality and algae density content of the inlet water of the regulating tank 2 are lower than the set water inlet highest value and higher than the set water inlet lowest value, the wastewater enters the air floatation tank 3, and the air floatation tank 3 starts to operate; when one of the water quality and algae density content of the inlet water of the regulating tank 2 is higher than a set water inlet highest value, the wastewater enters the air floatation tank 3, the air floatation tank 3 starts to operate, and meanwhile, the first pump station 10 starts to lift and reflux tail water of the water storage pond 7 to the regulating tank 2 so as to dilute high-concentration inlet water; when the water quality and algae density content of the effluent of the water storage pond 7 are higher than the set water outlet minimum value, the first pump station 10 is started, and tail water is returned to the regulating tank 2 for retreatment;
wherein, the water storage pond 7 provides three discharge modes, the first is that the water is directly discharged to the natural water body after reaching the standard; the second is that after the water quality reaches the standard, the water is lifted by a second pump station 9 and is used for recycling the cultivation water or irrigating farmlands; thirdly, if the water quality does not reach the standard, the water is lifted by the first pump station 10 to flow back to the regulating tank 2 and then treated again, or the water inflow exceeds the standard and is used for flowing back and diluting the water inflow, so that the subsequent treatment load is reduced.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (1)
1. The aquaculture wastewater treatment system is characterized by comprising a culture pond, an adjusting pond, an air floatation pond, a composite flow wetland, an ozone aeration pond, an ecological purification pond and a water storage pond which are connected in sequence;
the wastewater discharged from the culture pond flows into the regulating tank after water garbage is intercepted by the blocking net, water quality and water quantity are stabilized, and then the wastewater is discharged into the air floatation tank, and the air floatation tank is used for enabling micro bubbles to be adhered to particles in water after coagulation by the coagulant, so that the overall specific gravity of the particles is lower than that of the water, and the particles float up to the water surface and are scraped by the slag scraping device;
the treated wastewater flows into a composite flow wetland, is intercepted, filtered and adsorbed by wetland filler, aquatic plants and attached microorganisms, and is discharged into an ozone aeration tank; the tail water after ozone oxidation flows into an ecological purifying pond, and is discharged into a water storage pond after the residual antibiotics and nitrogen and phosphorus pollutants are further absorbed by aquatic plants;
the water storage pond is used for storing the tail water after treatment; wherein, the tail end of the pool and the front end of the regulating tank are provided with return pipelines; the return pipeline is used for returning tail water of the water storage pond to the regulating tank;
a first pump station is arranged at one end, close to the water storage pond, of the return pipeline; the first pump station is used for lifting tail water of the water storage pond to flow back to the regulating tank; the other end of the water storage pond is provided with a second pump station, and the second pump station is used for externally supplying water to tail water of the water storage pond;
the regulating tank and the water storage pond are internally provided with monitoring systems, and the monitoring systems are used for monitoring water quality and algae density of inlet water and outlet water and regulating and controlling a water inlet and outlet circulating pipeline according to the set target water quality and algae density; wherein the flow pipeline for water inlet and outlet is controlled by an electromagnetic valve;
the monitoring system comprises a water quality detection sensor, an algae density automatic detector, an information transmission module and a data analysis processing module, wherein the water quality detection sensor and the algae density automatic detector are respectively used for monitoring the water quality and algae density conditions of inlet and outlet water in real time, and transmitting monitoring data to the data analysis processing module through the information transmission module;
the data analysis processing module is used for regulating and controlling the water inlet and outlet circulation pipelines after analyzing the monitoring data, and the specific regulation and control steps are as follows:
when the water quality and algae density content of the inlet water of the regulating tank are lower than the set minimum value of the inlet water, the waste water is directly discharged into the composite flow wetland;
when the water quality and algae density content of the inlet water of the regulating tank are lower than the set water inlet highest value and higher than the set water inlet lowest value, the wastewater enters the air floatation tank, and the air floatation tank starts to operate;
when one of the water quality and the algae density content of the inlet water of the regulating tank is higher than the set water inlet highest value, the wastewater enters the air floatation tank, the air floatation tank starts to operate, and meanwhile, the first pump station starts to lift and reflux tail water of the water storage tank to the regulating tank so as to dilute the high-concentration inlet water;
when one of the water quality and the algae density content of the effluent of the water storage pond is higher than a set water outlet minimum value, the first pump station is started, and tail water is returned to the regulating tank for retreatment;
the culture pond, the regulating tank, the air floatation tank, the composite flow wetland, the ozone aeration tank, the ecological purification pond and the water storage pond are connected in series through ecological ditches, and the positions of the culture pond, the regulating tank, the air floatation tank, the composite flow wetland, the ozone aeration tank, the ecological purification pond and the water storage pond are gradually reduced; a blocking net is arranged at the water inlet of the regulating tank and used for intercepting the water surface garbage discharged from the culture pond; the air floatation tank is a pressurized dissolved air floatation tank, and the treated water quantity is determined according to the wastewater discharge scale of the culture pond;
the composite flow wetland is a composite vertical flow wetland, the aspect ratio is 3:1, and the hydraulic retention time is 2 days; the composite flow wetland filler comprises gravel, zeolite and ceramsite from bottom to top in sequence, wherein the depth is 1:1:4, the particle size of the gravel is 2-5cm, the particle size of the zeolite is 1-3cm, and the particle size of the ceramsite is 1-3cm; the aquatic plants on the composite flow wetland are two or more of canna, calamus, typha, flos lonicerae and Graptopetalum album, and the planting density is 9 plants per square meter-25 plants per square meter;
the ozone aeration tank is of a fully-closed structure, the depth of the tank is not less than 3m, the ozone adding amount is 1.5-2.0mg/L, and the hydraulic retention time is not less than 5min; aquatic plants are planted in the ecological purification pond, the ecological purification pond comprises emergent aquatic plants, submerged plants, floating leaf plants and ecological floating islands, the planting areas of the emergent aquatic plants, the submerged plants and the floating leaf plants are 3:2:1, and the total planting area of the aquatic plants is 60% of the area of the water area of the ecological purification pond;
the emergent aquatic plants comprise one or a combination of several of canna, calamus, pennisetum hydridum and reed;
the submerged plant comprises one or more of herba Sonchi Oleracei, sargassum horneri, and herba Eichhorniae;
the floating leaf plant comprises one or a combination of more of lotus, water lily and Nuphar;
the ecological floating island is of a dragline fixed type, and the planted plants are one or a combination of a plurality of balata, pennisetum hydridum and ryegrass;
the water storage pond provides three discharge modes; the first is that the water is directly discharged to natural water after reaching the standard; the second is that after the water quality reaches the standard, the water is lifted by a second pump station and is used for recycling the cultivation water or irrigating farmlands; thirdly, if the water quality does not reach the standard, the water is lifted and returned to the regulating tank for reprocessing through the first pump station, or the water inlet exceeds the standard and is used for refluxing and diluting the water inlet, so that the subsequent processing load is reduced.
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| CN115417492B (en) * | 2022-08-30 | 2023-06-20 | 同济大学建筑设计研究院(集团)有限公司 | Advanced oxidation system based on underwater vision and control method |
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