CN114873862A - Aquaculture effluent disposal system - Google Patents
Aquaculture effluent disposal system Download PDFInfo
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- CN114873862A CN114873862A CN202210611268.3A CN202210611268A CN114873862A CN 114873862 A CN114873862 A CN 114873862A CN 202210611268 A CN202210611268 A CN 202210611268A CN 114873862 A CN114873862 A CN 114873862A
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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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- Environmental Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biodiversity & Conservation Biology (AREA)
- Animal Husbandry (AREA)
- Hydrology & Water Resources (AREA)
- Marine Sciences & Fisheries (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (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 sewage treatment, and solves the technical problems of poor treatment effect, single treatment target, low automation degree and waste of water resources caused by direct discharge of treated tail water of the conventional aquaculture wastewater treatment; comprises a culture pond, an adjusting tank, an air floatation tank, a composite flow wetland, an ozone aeration tank, 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 the water, purify the water body and improve the water quality; monitoring systems are arranged in the regulating pond and the water storage pond and are used for monitoring the water quality and the algae density of inlet and outlet water, and regulating and controlling the flow pipelines of the inlet and outlet water according to the set target water quality and the algae density, so that the high-degree automatic operation is realized, the use cost is reduced, the water resource is saved, and the ecological system is friendly to surrounding water.
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 culture scale and the heavy use of antibiotics, the discharge amount of culture wastewater and the pollution concentration are remarkably increased. Most of aquaculture wastewater belongs to slightly polluted water, the pollution load is relatively low, the treatment is relatively easy, but some aquaculture wastewater is sensitive to the water quality requirement, particularly the removal of nitrogen, phosphorus, antibiotics and algae in water needs a relatively mature and complete treatment process, and the low consumption, high efficiency and cyclic utilization are required.
At present, the aquaculture wastewater mainly comprises physical (precipitation filtration), chemical (oxidative decomposition), biological (microbial treatment) and ecological (artificial wetland, stable pond and the like) treatment technologies, such as patent technologies with the grant publication numbers of CN212368186U and CN113716818A, and the aquaculture wastewater can be used for removing pollutants such as nitrogen and phosphorus in the wastewater, is high in resource utilization rate and has certain economic benefit. However, the technologies have the problems of poor treatment effect, single treatment target, low automation degree, waste of water resources caused by direct discharge of treated tail water and the like. Based on the defects, the invention provides an aquaculture wastewater treatment system.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an aquaculture wastewater treatment system, which adopts comprehensive and intensified technology and intelligent online monitoring technology, automatically regulates the circulation and discharge of inlet and outlet water according to the quality of the inlet and outlet water and the detection result of the algae density, and realizes stable water quality reaching the standard and cyclic utilization.
In order to achieve the above object, an aquaculture wastewater treatment system is provided according to an embodiment of the first aspect of the invention, which comprises a culture pond, a regulating pond, an air flotation pond, a composite flow wetland, an ozone aeration pond, an ecological purification pond and a water storage pond, which are connected in sequence;
waste water discharged from the culture pond flows into the regulating tank after intercepting water surface garbage through the blocking net, is discharged into the air flotation tank after stabilizing the water quality and water quantity, and is adhered to water particles coagulated by a coagulant by releasing a large amount of fine bubbles in the air flotation tank, so that the overall specific gravity of the particles is smaller than that of water, and the particles float to the water surface and are scraped away by a slag scraping device; the air floatation tank has good effect of removing algae, nitrogen and phosphorus, and has the advantages of quick effect, low treatment cost, small occupied area and simple maintenance;
the treated wastewater flows into a composite flow wetland, and is discharged into an ozone aeration tank after being intercepted, filtered and adsorbed by wetland fillers, aquatic plants and attached microorganisms; the 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 being oxidized by the ozone flows into an ecological purification pond, and is discharged into a water storage pond after residual antibiotics and nitrogen and phosphorus pollutants are further absorbed by aquatic plants; the water storage pond is used for storing the treated tail water;
wherein the tail end of the water storage pond and the front end of the regulating pond 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 of the return pipeline, which is close to the water storage pond; 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 supplying water to the outside from the tail water of the water storage pond;
monitoring systems are arranged in the regulating pond and the water storage pond and are used for monitoring the water quality and the algae density of inlet and outlet water and regulating and controlling a flow pipeline of the inlet and outlet water according to the set target water quality and the algae density; wherein the flow pipeline of the inlet and outlet water is controlled by a solenoid valve.
Furthermore, the monitoring system comprises a water quality detection sensor, an automatic algae density detector, an information transmission module and a data analysis processing module, wherein the water quality detection sensor and the automatic algae density detector are respectively used for monitoring the water quality and the algae density of inlet and outlet water in real time and transmitting the monitoring data to the data analysis processing module through the information transmission module.
Further, the data analysis processing module is used for regulating and controlling the water inlet and outlet circulation pipelines after analyzing and monitoring data, and the specific regulating and controlling steps are as follows:
when the quality of the inlet water and the density content of algae in the regulating reservoir are lower than the set minimum value of the inlet water, the wastewater is directly discharged into the composite flow wetland;
when one of the quality and the density content of the inlet water of the regulating tank is lower than the set highest value of the inlet water and higher than the set lowest value of the inlet water, the wastewater enters the air flotation tank, and the air flotation tank is started to operate;
when the quality and the density content of the inlet water of the regulating tank are higher than a set highest value of the inlet water, the wastewater enters the air flotation tank, the air flotation tank is started to operate, meanwhile, the first pump station is started, the tail water of the water storage tank is lifted and flows back to the regulating tank, and the high-concentration inlet water is diluted;
and when the effluent quality and the algae density content of the storage pond are higher than the set minimum effluent value, the first pump station is started, and tail water flows back to the regulating reservoir for secondary treatment.
Furthermore, the culture pond, the adjusting 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 channels, and the positions are gradually reduced.
Furthermore, a blocking net is arranged at the water inlet of the adjusting pond and used for blocking water surface garbage discharged from the culture pond.
Furthermore, the air floatation tank is a pressurized dissolved air floatation tank, and the treatment water 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 length-width ratio is 3:1, and the hydraulic retention time is 2 days; the composite flow wetland filler comprises gravels, zeolite and ceramsite from bottom to top in sequence, wherein the depth is 1:1:4, the particle size of the gravels is 2-5cm, the particle size of the zeolite is 1-3cm, and the particle size of the ceramsite is 1-3 cm; the aquatic plants on the composite flow wetland comprise two or more than two of canna, calamus, cattail, hydrangea aspera and pinus gracilis, and the planting density is 9 per square meter to 25 per square meter.
Furthermore, the ozone aeration tank is of a fully-closed structure, the depth of the tank is not less than 3m, the adding amount of ozone is 1.5-2.0mg/L, and the hydraulic retention time is not less than 5 min.
Furthermore, aquatic plants are planted in the ecological purification pond and comprise emergent aquatic plants, submerged plants, floating-leaf plants and ecological floating islands, the planting area of the emergent aquatic plants, the planting area of the submerged plants and the planting area of the floating-leaf plants are 3:2:1, and the total planting area of the aquatic plants is 60 percent of the area of the water area of the ecological purification pond;
the emergent aquatic plant comprises one or more of canna, calamus, pennisetum hydridum and reed;
the submerged plant comprises one or more of herba Swertiae Dilutae, hydrilla verticillata, Auricularia, and Eucheuma Gelatinosum;
the water lily plant comprises one or more of lotus, water lily and Nuphar pumilum;
the ecological floating island is in a guy rope fixing type, and the planted plants are one or a combination of several of balanophora, pennisetum hydridum and ryegrass.
Further, the impoundment pond 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 the water quality reaches the standard and is lifted by a second pump station for the recycling of culture water or the irrigation of farmlands; and the third is that if the water quality does not reach the standard, the water is lifted by the first pump station and flows back to the regulating tank for secondary treatment, or the inflow water exceeds the standard and is used for flowing back and diluting the inflow water, so that the subsequent treatment load is reduced.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts a physicochemical-ecological compounding method, the air floating tank and the composite flow wetland can effectively remove pollutants such as algae, nitrogen and phosphorus in 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 various pollutants such as nitrogen and phosphorus pollutants, algae, antibiotics and pathogenic bacteria in aquaculture wastewater can be effectively removed through the combination of physicochemical and ecological treatment processes, so that a water body is purified, and the water quality is improved; meanwhile, the monitoring system can realize high-degree automatic operation, realize the circulating circulation of inlet and outlet water, ensure the effluent quality to reach the standard and reduce the use cost; the treated tail water reaching the standard can be reused, so that 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 present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a system block diagram of an aquaculture wastewater treatment system of the present invention.
FIG. 2 is a schematic view of an aquaculture wastewater treatment system according to the present invention.
In the figure: 1. a culture pond; 2. a regulating tank; 3. an air floatation tank; 4. a composite flow wetland; 5. an ozone aeration tank; 6. an ecological purification pond; 7. a water storage pond; 8. a monitoring system; 9. a second pump station; 10. a first pump station; 11. a return line.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an aquaculture wastewater treatment system which has the advantages of good treatment effect, multiple pollutant removal types, high automation degree and capability of realizing water resource reutilization.
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 connected in sequence; wherein, the tail end of the water storage pond 7 and the front end of the adjusting pond 2 are provided with return pipelines 11; a first pump station 10 is arranged at one end of the return pipeline 11, which is close to the water storage pond 7; the first pump station 10 is used for lifting tail water of the water storage pond 7 to flow back to the regulating reservoir 2; a second pump station 9 is arranged at the other end of the water storage pond 7, and the second pump station 9 is used for supplying water to the outside from the tail water of the water storage pond 7;
the monitoring system 8 comprises a water quality detection sensor, an automatic algae density detector, an information transmission module and a data analysis processing module, wherein the water quality detection sensor and the automatic algae density detector are respectively used for monitoring the water quality and the algae density 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 a water inlet and outlet circulation pipeline after analyzing the monitoring data, wherein the water inlet and outlet circulation pipeline is controlled by an electromagnetic valve; the specific analysis steps are as follows:
when the quality of the inlet water and the density content of algae in the regulating reservoir 2 are lower than the set minimum value of the inlet water, the wastewater is directly discharged into the composite flow wetland 4;
when one of the quality and the density content of the inlet water of the adjusting tank 2 is lower than the set highest value of the inlet water and higher than the set lowest value of the inlet water, the wastewater enters the air flotation tank 3, and the air flotation tank 3 is started to operate;
when the quality and the density content of the inlet water of the regulating tank 2 are higher than a set highest value of the inlet water, the wastewater enters the air flotation tank 3, the air flotation tank 3 is started to operate, meanwhile, the first pump station 10 is started to lift and reflux the tail water of the water storage pond 7 to the regulating tank 2, and high-concentration inlet water is diluted;
when the quality and the density content of the effluent of the water storage pond 7 are higher than the set minimum value of the effluent, the first pump station 10 is started, and tail water flows back to the regulating tank 2 for secondary treatment;
the culture pond 1, the adjusting 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 channels, and the positions are gradually reduced;
a blocking net is arranged at the water inlet of the adjusting pond 2 and used for blocking water surface garbage discharged from the culture pond 1;
the air flotation tank 3 is a pressurized dissolved air flotation tank 3, and the treatment water amount is determined according to the wastewater discharge scale of the culture pond 1; wherein 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 length-width ratio is 3:1, and the hydraulic retention time is 2 days; the depth of the composite flow wetland 4 filler 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 1-3 cm;
the aquatic plants on the composite flow wetland 4 are two or more than two of canna, calamus, cattail, hydrangea aspera and pinus gracilis, and the planting density is 9 per square meter to 25 per square meter;
the ozone aeration tank 5 is of a fully-closed structure, the tank depth is not less than 3m, the ozone adding amount is 1.5-2.0mg/L, and the hydraulic retention time is not less than 5 min;
aquatic plants are planted in the ecological purification pond 6 and comprise emergent aquatic plants, submerged plants, floating-leaf plants and ecological floating islands, the planting area of the emergent aquatic plants, the submerged plants and the floating-leaf plants is 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 plant comprises one or more of canna, calamus, pennisetum hydridum and reed;
the submerged plant comprises one or more of herba Swertiae Dilutae, hydrilla verticillata, Goldfish algae, and herba Eupatorii;
the water lily plant comprises one or more of lotus, water lily and Nuphar pumilum;
the ecological floating island is in a guy cable fixing type, and the planted plants are one or a combination of several of balanophora, 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 reservoir 2;
a concrete implementation method of an aquaculture wastewater treatment system comprises the following steps:
the waste water discharged from the culture pond 1 flows into the adjusting tank 2 after intercepting water surface garbage through the blocking net, is discharged into the air floating tank 3 after stabilizing the water quality and water quantity, the air floating tank 3 causes the particles to be adhered to the particles in the water coagulated by the coagulant by releasing a large amount of micro-fine bubbles, so that the integral specific gravity of the particles is smaller than that of the water, the particles float to the water surface, and the particles are scraped away by the slag scraping device, the air floating tank 3 has a good removing effect on algae and nitrogen and phosphorus, and has the advantages of quick effect, low treatment cost, small occupied area and simple maintenance;
the treated wastewater flows into a composite flow wetland 4, is filtered and adsorbed by wetland fillers, aquatic plants and attached microorganisms, and then is discharged into an ozone aeration tank 5, the ozone has strong oxidizing property, can well remove antibiotics such as beta-lactam, macrolide, chloramphenicol and the like and kill pathogenic bacteria in water, and has the advantages of short reaction time, no secondary pollution, simple process and capability of enriching oxygen in the water;
the tail water oxidized by ozone flows into the ecological purification pond 6, aquatic plants with better antibiotic absorption effect are planted in the ecological purification pond 6, the aquatic plants further absorb residual antibiotics, nitrogen, phosphorus and other pollutants and then are discharged into the water storage pond 7, and the water storage pond 7 is used for storing the treated tail water.
The water storage pond 7 provides three discharge modes, wherein the first mode is that the water is directly discharged to a natural water body after reaching the standard; the second is that the water quality reaches the standard and is lifted by a second pump station 9 for the recycling of the culture water or the farmland irrigation; and the third is that if the water quality does not reach the standard, the water is lifted by the first pump station 10 and flows back to the regulating tank 2 for secondary treatment, or the inflow water exceeds the standard and is used for flowing back and diluting the inflow water, so that the subsequent treatment load is reduced.
The invention adopts a physicochemical-ecological composite method, the air flotation tank 3 and the composite flow wetland 4 can effectively remove pollutants such as algae, nitrogen and phosphorus in aquaculture wastewater, the ozone aeration tank 5 and the ecological purification pond 6 can reduce the content of antibiotics in water and kill pathogenic bacteria in water, and various pollutants such as nitrogen and phosphorus pollutants, algae, antibiotics and pathogenic bacteria in aquaculture wastewater can be effectively removed through the combination of physicochemical and ecological treatment processes, so that a water body is purified, and the water quality is improved; meanwhile, the monitoring system 8 can realize high-degree automatic operation, realize the circulating circulation of inlet and outlet water, ensure the effluent quality to reach the standard and reduce the use cost; the tail water after reaching the standard after treatment can be reused, thereby saving water resources and being friendly to surrounding water ecological systems.
The working principle of the invention is as follows:
an aquaculture wastewater treatment system comprises a culture pond 1, an adjusting 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 connected in sequence when in work; the waste water discharged from the culture pond 1 flows into the regulating tank 2 after intercepting the garbage on the water surface by the blocking net, the waste water is discharged into the air flotation tank 3 after stabilizing the water quality and water quantity, the air flotation tank 3 causes the waste water to be adhered to the water particles coagulated by the coagulant by releasing a large amount of micro-fine bubbles so as to cause the particles to float up to the water surface because the integral specific gravity is smaller than that of the water, the waste water is scraped away by a slag scraping device, the treated waste water flows into the composite flow wetland 4, is discharged into the ozone aeration tank 5 after being intercepted and filtered by wetland filler, aquatic plants and attached microorganisms and absorbing impurities, the tail water after being oxidized by ozone flows into the ecological purification pond 6, is discharged into the water storage pond 7 after further absorbing the pollutants such as residual antibiotics, nitrogen and phosphorus and the like by the aquatic plants, and the water storage pond 7 is used for storing the treated tail water;
monitoring systems 8 are arranged in the adjusting tank 2 and the water storage pond 7 and are used for monitoring the water quality and the algae density of inlet and outlet water and regulating and controlling a flow pipeline of the inlet and outlet water according to the set target water quality and algae density; when the quality of the inlet water and the density content of algae in the regulating reservoir 2 are lower than the set minimum value of the inlet water, the wastewater is directly discharged into the composite flow wetland 4; when one of the quality and the density content of the inlet water of the adjusting tank 2 is lower than the set highest value of the inlet water and higher than the set lowest value of the inlet water, the wastewater enters the air flotation tank 3, and the air flotation tank 3 is started to operate; when the quality and the density content of the inlet water of the regulating tank 2 are higher than a set highest value of the inlet water, the wastewater enters the air flotation tank 3, the air flotation tank 3 is started to operate, meanwhile, the first pump station 10 is started to lift and reflux the tail water of the water storage pond 7 to the regulating tank 2, and high-concentration inlet water is diluted; when the quality and the density content of the effluent of the water storage pond 7 are higher than the set minimum value of the effluent, the first pump station 10 is started, and tail water flows back to the regulating tank 2 for secondary treatment;
the water storage pond 7 provides three discharge modes, wherein the first mode is that the water is directly discharged to a natural water body after reaching the standard; the second is that the water quality reaches the standard and is lifted by a second pump station 9 for the recycling of the culture water or the farmland irrigation; and the third is that if the water quality does not reach the standard, the water is lifted by the first pump station 10 and flows back to the regulating tank 2 for secondary treatment, or the inflow water exceeds the standard and is used for flowing back and diluting the inflow water, so that the subsequent treatment load is reduced.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms 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 utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. An aquaculture wastewater treatment system is characterized by comprising a culture pond, an adjusting tank, an air floatation tank, a composite flow wetland, an ozone aeration tank, an ecological purification pond and a water storage pond which are connected in sequence;
waste water discharged from the culture pond flows into the regulating tank after intercepting water surface garbage through the blocking net, is discharged into the air flotation tank after stabilizing the water quality and water quantity, and the air flotation tank enables the micro-fine bubbles to be adhered to water particles coagulated by a coagulant by releasing the micro-fine bubbles, so that the overall specific gravity of the particles is smaller than that of water, and the particles float to the water surface and are scraped away by a slag scraping device;
the treated wastewater flows into a composite flow wetland, and is discharged into an ozone aeration tank after being intercepted, filtered and adsorbed by wetland fillers, aquatic plants and attached microorganisms; the tail water after being oxidized by the ozone flows into an ecological purification pond, and is discharged into a water storage pond after residual antibiotics and nitrogen and phosphorus pollutants are further absorbed by aquatic plants;
the water storage pond is used for storing the treated tail water; wherein, the tail end of the water storage pond and the front end of the regulating pond 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 of the return pipeline, which is close to the water storage pond; 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 supplying water to the outside from the tail water of the water storage pond;
monitoring systems are arranged in the regulating pond and the water storage pond and are used for monitoring the water quality and the algae density of inlet and outlet water and regulating and controlling a flow pipeline of the inlet and outlet water according to the set target water quality and the algae density; wherein the flow pipeline of the inlet and outlet water is controlled by a solenoid valve.
2. The aquaculture wastewater treatment system of claim 1, wherein the monitoring system comprises a water quality detection sensor, an automatic algae density detector, an information transmission module and a data analysis processing module, wherein the water quality detection sensor and the automatic algae density detector are respectively used for monitoring the water quality and the algae density of inlet and outlet water in real time and transmitting the monitoring data to the data analysis processing module through the information transmission module.
3. The aquaculture wastewater treatment system of claim 2, wherein the data analysis and processing module is used for regulating and controlling the water inlet and outlet flow pipeline after analyzing and monitoring data, and the specific regulation and control steps are as follows:
when the quality of the inlet water and the density content of algae in the regulating reservoir are lower than the set minimum value of the inlet water, the wastewater is directly discharged into the composite flow wetland;
when one of the quality and the density content of the inlet water of the regulating tank is lower than the set highest value of the inlet water and higher than the set lowest value of the inlet water, the wastewater enters the air flotation tank, and the air flotation tank is started to operate;
when the quality and the density content of the inlet water of the regulating tank are higher than a set highest value of the inlet water, the wastewater enters the air flotation tank, the air flotation tank is started to operate, meanwhile, the first pump station is started, the tail water of the water storage tank is lifted and flows back to the regulating tank, and the high-concentration inlet water is diluted;
and when the effluent quality and the algae density content of the storage pond are higher than the set minimum effluent value, the first pump station is started, and tail water flows back to the regulating reservoir for secondary treatment.
4. The aquaculture wastewater treatment system of claim 1, wherein the culture pond, the adjusting tank, the air flotation tank, the composite flow wetland, the ozone aeration tank, the ecological purification pond and the water storage pond are connected in series through ecological channels, and the positions of the ecological purification pond and the water storage pond are gradually reduced.
5. The aquaculture wastewater treatment system of claim 1, wherein a barrier is arranged at the water inlet of the regulating pond and used for intercepting the water surface garbage discharged from the culture pond.
6. The aquaculture wastewater treatment system of claim 1, wherein the flotation tank is a pressurized dissolved air flotation tank, and the amount of treated water is determined according to the wastewater discharge scale of the culture pond.
7. The aquaculture wastewater treatment system of claim 1, wherein the composite flow wetland is a composite vertical flow wetland with an aspect ratio of 3:1 and a hydraulic retention time of 2 days; the composite flow wetland filler comprises gravels, zeolite and ceramsite from bottom to top in sequence, wherein the depth is 1:1:4, the particle size of the gravels is 2-5cm, the particle size of the zeolite is 1-3cm, and the particle size of the ceramsite is 1-3 cm; the aquatic plants on the composite flow wetland comprise two or more than two of canna, calamus, cattail, hydrangea aspera and pinus gracilis, and the planting density is 9 per square meter to 25 per square meter.
8. The aquaculture wastewater treatment system of claim 1, wherein the ozone aeration tank is of a fully closed structure, the tank depth is not less than 3m, the ozone dosage is 1.5-2.0mg/L, and the hydraulic retention time is not less than 5 min.
9. The aquaculture wastewater treatment system of claim 1, wherein the ecological purification pond is planted with aquatic plants, including emergent aquatic plants, submerged plants, leafy plants and ecological floating islands, the planting area of the emergent aquatic plants, the submerged plants and the leafy plants is 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 plant comprises one or more of canna, calamus, pennisetum hydridum and reed;
the submerged plant comprises one or more of herba Swertiae Dilutae, hydrilla verticillata, Goldfish algae, and herba Eupatorii;
the water lily plant comprises one or more of lotus, water lily and Nuphar pumilum;
the ecological floating island is in a guy rope fixing type, and the planted plants are one or a combination of several of balanophora, pennisetum hydridum and ryegrass.
10. An aquaculture wastewater treatment system according to claim 1 wherein said impoundment pond 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 the water quality reaches the standard and is lifted by a second pump station for the recycling of culture water or the irrigation of farmlands; and the third is that if the water quality does not reach the standard, the water is lifted by the first pump station and flows back to the regulating tank for secondary treatment, or the inflow water exceeds the standard and is used for flowing back and diluting the inflow water, so that the subsequent treatment load is reduced.
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| CN115417492A (en) * | 2022-08-30 | 2022-12-02 | 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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