CN107751085B - Circulating seawater culture system based on microalgae membrane bioreactor - Google Patents
Circulating seawater culture system based on microalgae membrane bioreactor Download PDFInfo
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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
- A01K63/04—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
- A01K63/042—Introducing gases into the water, e.g. aerators, air pumps
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
-
- 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
- C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental Sciences (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Biotechnology (AREA)
- Microbiology (AREA)
- Marine Sciences & Fisheries (AREA)
- Animal Husbandry (AREA)
- Botany (AREA)
- Biological Treatment Of Waste Water (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
Abstract
The invention provides a circulating seawater culture system based on a microalgae membrane bioreactor, which comprises a culture pond, wherein the culture pond is connected with a photobioreactor, the photobioreactor is connected with a microalgae concentration pond through a water pump, an ultrafiltration membrane component is arranged in the microalgae concentration pond, a water outlet of the ultrafiltration membrane component is connected with the culture pond through the water pump, and a sewage port and a drain pipe are arranged in the center of the culture pond.
Description
Technical Field
The invention belongs to the technical field of circulating mariculture, and particularly relates to a circulating mariculture system based on a microalgae membrane bioreactor.
Background
In recent years, new ecological restoration technology is introduced into a seawater culture system, and related research and application are mostly based on the purification effect of microorganisms, macroalgae, filter-feeding shellfish and the like, so that the ecological restoration system has the advantages of being suitable for culture seawater with low nutrient level; the culture byproducts such as shellfish and algae with economic value can be obtained while the water quality is purified; and the technical implementation and the operation management are simple and convenient, and the cost is low.
As fishery is excessively fished and environmental pollution is aggravated, marine fishery resources are increasingly declined, marine products far from meeting market demands can only relieve the pressure of marine product demands by developing mariculture. The mariculture industry in China is developed rapidly, the variety of aquaculture is increased continuously, the scale is enlarged continuously, the intensification degree is improved continuously, but the problems of overlarge energy consumption, self-pollution of aquaculture and the like exist, the sustainable development of the mariculture industry is hindered, the potential influence of the discharge of the aquiculture wastewater on the environment can be reduced by adopting the circulating mariculture, the occupied area and the water consumption can be greatly saved, and the advantages of short aquaculture period, high yield and product price and the like are also realized.
Disclosure of Invention
The invention aims to provide a circulating seawater culture system based on a microalgae membrane bioreactor, which utilizes microalgae culture to efficiently remove ammonia nitrogen and phosphate in culture wastewater, can realize the recycling of the culture water and the recycling of nutrient elements in the culture process, is convenient to remove residual baits and feces in a culture pond, is quantitatively controllable in wastewater discharge, and is accurate in culture process condition control.
The scheme adopted by the invention for solving the technical problems is as follows: a circulating seawater culture system based on a microalgae membrane bioreactor comprises a culture pond, wherein the culture pond is connected with a photobioreactor, the photobioreactor is connected with a microalgae concentration pond through a water pump, an ultrafiltration membrane component is arranged in the microalgae concentration pond, a water outlet of the ultrafiltration membrane component is connected with the culture pond through the water pump, and a sewage port and a drain pipe are arranged in the center of the culture pond.
Preferably, the bottoms of the photobioreactor and the microalgae concentration tank are respectively provided with a microporous diffuser, the microporous diffusers are connected with an air compressor, and the photobioreactor is filled with 4% CO2The air of (2) has an inlet strength of 1.2-1.5m3/(m3d) Aeration and microalgae concentration ofIntroducing air into the pool, and adjusting the intensity to 0.5-0.7m3/(m3d) Aerating through a microporous diffuser and an air compressor, and introducing 4% CO into the photobioreactor2The air of (2) aerate, can provide the stirring and provide the required inorganic carbon source of little algae growth for little algae growth, and be favorable to preventing little algae cell subside, reduce and attach the wall or sink the end, also can effectively reduce gaseous conduction resistance, make inorganic carbon source evenly distributed, avoid local concentration too high, still can prevent that the water surface from producing the mycoderm and influencing little algae growth, let in the air in little algae concentration pond, can provide the stirring for little algae concentration pond, and can prevent that the surperficial deposit of ultrafiltration membrane subassembly in little algae concentration pond from forming the pollutant layer, effectively guarantee the normal clear of circulating seawater system.
Preferably, the concentrated algae liquid in the microalgae concentration tank is conveyed back to the photobioreactor by a water pump, the concentration of the algae liquid in the photobioreactor is kept to be 1.0-1.5g/L, the concentrated microalgae in the microalgae concentration tank is harvested and processed to be made into bait and is fed to the culture tank, the retention time of the microalgae in the culture system is 25-40 d, part of the algae liquid in the microalgae concentration tank is conveyed back to the photobioreactor to maintain higher concentration of the microalgae in the photobioreactor, thereby realizing the high-efficiency absorption of nitrogen and phosphorus, harvesting the other part of algae liquid in the microalgae concentration tank, processing the algae liquid into the bait of the cultivated organisms, feeding the bait into the cultivation tank, therefore, the cyclic utilization of nutrient elements in the culture process is realized, the control of the retention time of the microalgae not only can ensure that the microalgae has excellent purification effect on the wastewater, but also can ensure that the microalgae grows well and has higher recovery value.
Preferably, the bottom of the sewage port is connected with a sewage discharge pipeline, the open end of the sewage port is provided with a filtering piece, the filtering piece comprises a filtering plate, sewage discharge holes are uniformly distributed on the surface of the filtering plate, a blocking piece is arranged between the sewage discharge holes, the upper half part of the blocking piece is a semicircle, the lower half part of the blocking piece is a concave shape, the sewage port can collect residual baits or excrement and urine to enter the sewage discharge pipeline, the tail end of the sewage discharge pipeline is provided with a switch valve, the switch valve is opened to discharge the residual baits and the excrement and the discharged residual baits and excrement and urine can be used as crop waste after being collected to a certain degree, so that not only the environmental pollution is avoided, but also the green utilization of wastes can be realized, the open end of the sewage port is provided with the filtering piece, the sewage discharge holes on the surface of the filtering piece can allow the cultured organisms to be blocked on the, thereby reduce the suction influence, and hinder a surperficial rounding off, the surface area is big, but greatly reduced breeds biological injured probability, still can improve incomplete bait and faecal discharge smoothness degree, hinders and be solid, and its gravity still can improve and filter the stability of laying, avoids the drainage process to filter the piece and float and cause the condition that the living fair current of breed escaped from.
Preferably, the drain pipe penetrates through the sewage port, the ratio of the diameter of the drain pipe to the diameter of the sewage port is 1:1.8-2.4, the drain pipe is formed by connecting the drain pipe inside the culture pond and the drain pipe outside the culture pond, the drain pipe and the sewage port are arranged together, so that sewage and wastewater can be conveniently discharged, the ratio of the diameter of the drain pipe to the diameter of the sewage port not only improves the installation stability of the drain pipe, but also can ensure the smoothness of sewage discharged from the sewage port, and the drain pipe is divided into an inner part and an outer part, so that the performance of.
As preferred, the inside of breeding the inside drain pipe in pond is the dead lever, the dead lever surface is equipped with the scale mark, dead lever surface nestification has the electric lift ring, electric lift ring lower extreme is connected with flexible pipe, breed the outside drain pipe in pond is drainage pipe, the formation polygon is arranged to the dead lever, inlay the flexible pipe of cover outward and form upright water pipe, when electric lift ring is in the dead lever top, water is bred in flexible pipe separation, thereby realize normal breed, when electric lift ring descends, flexible pipe shortens, thereby the event is higher than the water inflow drain pipe of flexible pipe and discharges, thereby flexible pipe's flexible pipe makes the drain pipe have the function of blockking up water and drainage, the dead lever surface is equipped with the scale mark, can calculate displacement according to electric lift ring descending distance: v is a × b × h, and V is a displacement (m)3) The method has the advantages that the length (m) of the culture pond is a, the width (m) of the culture pond is b, and the exposed scale value (m) of the fixed rod is h, so that the wastewater discharge quantity can be quantitatively measured, the culture system has more accurate condition control, and the wastewater treatment effect and the culture effect are improved.
As preferred, breed the inside lateral wall in pond and be equipped with the washing pipeline, wash the pipeline water spray direction and be clockwise or anticlockwise, breed the washing pipeline water spray direction of pond inner wall certain for spun water forms certain rotatory rivers, thereby improves the discharge of incomplete bait and faecal, improves the cleaning performance.
Preferably, the microalgae is cultured in the photobioreactor, the wastewater in the culture pond is sent into the photobioreactor through the drain pipe, the retention time of the wastewater in the photobioreactor is 1.0d-1.5d, the microalgae culturing effect of the photobioreactor is good, and the retention time of the wastewater in the photobioreactor is controlled, so that the wastewater purifying effect can be improved, the microalgae has good activity, the purifying time can be shortened, and the water circulation period can be shortened.
Compared with the prior art, the method has the beneficial effects that 1) pollutants such as free ammonia, phosphate and the like in the culture wastewater can be completely removed through the absorption effect of the microalgae cultured in the photobioreactor, the concentration of the free ammonia and the concentration of the active phosphate in the effluent can be reduced to be lower than the detection limit, and the cyclic utilization of the culture water is realized; 2) the cultured microalgae is processed into culture biological bait after being harvested, so that the cyclic utilization of nutrient elements in the culture process is realized; 3) the sewage port in the culture pond is provided with the filtering piece, so that residual baits and excrement can be smoothly discharged, and the harm or influence on cultured organisms can be avoided; 4) the drain pipe utilizes flexible pipe to realize blockking up the water and the switching of drainage function, and the scale mark on the dead lever realizes the quantitative determination of waste water discharge, improves farming systems condition control.
The invention adopts the technical scheme to provide the circulating mariculture system based on the microalgae membrane bioreactor, overcomes the defects of the prior art, and has reasonable design and convenient operation.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic view of a sewage and wastewater discharge mechanism according to the present invention;
FIG. 3 is a top view of the culture pond of the present invention;
FIG. 4 is a schematic view of the drain pipe after the electric lift ring of the present invention is lowered;
FIG. 5 is a schematic view of the drain pipe with the electric lifting ring at the highest position according to the present invention;
FIG. 6 is a top view of the drain pipe of the present invention;
FIG. 7 is a front view of a fixation rod of the present invention;
FIG. 8 is an enlarged fragmentary view of the filter of the present invention;
FIG. 9 is a front view of the filter element of the present invention;
FIG. 10 is a block diagram of the operation of the system of the present invention.
Description of reference numerals: 1, a culture pond; 2 a photobioreactor; 3, a microalgae concentration tank; 4, an ultrafiltration membrane component; 5, a water pump; 6, an air compressor; 7 a microporous diffuser; 8, cleaning the pipeline; 9 a sewage port; 10 a sewage pipeline; 11 a water discharge pipe; 12, a filter element; 13 fixing the rod; 14 electric lifting ring; 15 telescoping tubes; 16 a sewage draining hole; 17 a resistance member; 18 filter plates.
Detailed Description
The following is described in further detail with reference to the accompanying drawings and examples:
example 1:
as shown in figure 1, the effluent of the culture pond 1 enters a photobioreactor 2, substances such as nitrogen, phosphorus and the like in the culture wastewater are absorbed through the growth of microalgae, the retention time of the culture wastewater in the bioreactor 2 is controlled to be 1.0d-1.5d, a micropore diffuser 7 is arranged at the bottom of the photobioreactor 2 for aeration, and the introduced gas contains 4% of CO2The aeration intensity of the air is 1.2-1.5m3/(m3d) Stirring is provided for the growth of algae liquid and an inorganic carbon source required by the autotrophic growth of microalgae is provided, the algae liquid cultured by the photobioreactor 2 enters a microalgae concentration tank 3, a micropore diffuser 7 is also arranged at the bottom of the microalgae concentration tank 3 and is connected with an air compressor 6 to utilize air to move the gas, and the aeration rate is 0.5-0.7m3/(m3d) The main function is to provide stirring and control the formation of the deposited layer pollutant on the surface of the membrane component, the concentration of the algae liquid is realized in the microalgae concentration tank 3 through the ultrafiltration membrane component 4, part of the concentrated algae liquid returns to the photobioreactor 2, the concentration of the algae liquid in the photobioreactor 2 is maintained in the range of 1.0-1.5g/L, and the corresponding microalgae system isThe retention time in the system is 25d-40d, the effluent quality of the ultrafiltration membrane component 4 is excellent, wherein the concentrations of free ammonia, nitrite and the like with high toxicity to cultured organisms are all lower than the detection limit, the free ammonia, nitrite and the like are circulated into the culture pond 1 to realize circulating water culture, and the other part of the algae liquid in the microalgae concentration pond 3 is harvested and processed into the bait of the cultured organisms and is fed into the culture pond 1, so that the maximization of the utilization of nutrient elements in the culture process is realized.
Conventional techniques in this embodiment are known to those skilled in the art and will not be described in detail here.
Example 2:
as shown in fig. 1-10, a circulating seawater culture system based on a microalgae membrane bioreactor comprises a culture pond 1, wherein the culture pond 1 is connected with a photobioreactor 2, the photobioreactor 2 is connected with a microalgae concentration pond 3 through a water pump 5, an ultrafiltration membrane component 4 is arranged in the microalgae concentration pond 3, a water outlet of the ultrafiltration membrane component 4 is connected with the culture pond 1 through the water pump 5, and a sewage port 9 and a drain pipe 11 are arranged in the center of the culture pond 1.
The bottoms of the photobioreactor 2 and the microalgae concentration tank 3 are both provided with a microporous diffuser 7, the microporous diffuser 7 is connected with an air compressor 6, and 4% CO is introduced into the photobioreactor 22Air of 1.3m in intake strength3/(m3d) Aerating, namely introducing air into the microalgae concentration tank 3, and controlling the strength to be 0.65m3/(m3d) The aeration is carried out through a microporous diffuser 7 and an air compressor 6, and the photobioreactor 2 is filled with the gas containing 4 percent of CO2The air is aerated to provide stirring for the growth of the microalgae and provide an inorganic carbon source required by the growth of the microalgae, and is favorable for preventing the sedimentation of microalgae cells, reducing the wall attachment or bottom deposition, effectively reducing the gas conduction resistance, uniformly distributing the inorganic carbon source, avoiding the overhigh local concentration and preventing the water surface from generating a mycoderm and shadowAnd air is introduced into the microalgae concentration tank 3 to stir the microalgae concentration tank 3 and prevent the surface of the ultrafiltration membrane component 4 in the microalgae concentration tank 3 from depositing to form a pollutant layer, so that the normal operation of a circulating seawater system is effectively ensured.
The microalgae concentration tank 3 conveys the concentrated algae liquid back to the photobioreactor 2 through a water pump 5, the concentration of the algae liquid in the photobioreactor 2 is kept to be 1.1g/L, the concentrated microalgae in the microalgae concentration tank 3 is harvested and processed to be made into bait and fed to the culture tank 1, the retention time of the microalgae in the culture system is 30d, part of the algae liquid in the microalgae concentration tank 3 is conveyed back to the photobioreactor 2 to maintain the high concentration of the microalgae in the photobioreactor 2, thereby realizing the high-efficiency absorption of nitrogen and phosphorus, harvesting the other part of the algae liquid in the microalgae concentration tank 3, processing the algae liquid into the bait of the cultivated organisms, feeding the bait into the cultivation tank 1, therefore, the cyclic utilization of nutrient elements in the culture process is realized, the control of the retention time of the microalgae not only can ensure that the microalgae has excellent purification effect on the wastewater, but also can ensure that the microalgae grows well and has higher recovery value.
The bottom of the sewage port 9 is connected with a sewage discharge pipeline 10, the open end of the sewage port 9 is provided with a filter piece 12, the filter piece 12 comprises a filter plate 18, sewage discharge holes 16 are uniformly distributed on the surface of the filter plate 18, a blocking piece 17 is arranged between the sewage discharge holes 16, the upper half part of the blocking piece 17 is a semicircle and the lower half part is a concave shape, the sewage port 9 can collect residual baits or excrement and urine and enter the sewage discharge pipeline 10, the tail end of the sewage discharge pipeline 10 is provided with a switch valve, the switch valve is opened to discharge after the residual baits and excrement and urine are collected to a certain degree, the discharged residual baits and excrement and urine can be used as crop waste after being collected, not only the environmental pollution is avoided, but also the green utilization of wastes can be realized, the open end of the sewage port 9 is provided with the filter piece 12, the sewage discharge holes 16 on the surface of the filter piece 12 can pass through the residual bait, the distance between the organism and the sewage discharge hole 16 is increased by the blocking piece 17, so that the influence of suction is reduced, the surface of the blocking piece 17 is smooth and large in surface area, the injury probability of the organism can be greatly reduced, the discharging fluency of residual baits and excrement can be improved, the blocking piece 17 is a solid piece, the gravity of the blocking piece can also improve the placing stability of the filtering piece 12, and the condition that the filtering piece 12 floats in the drainage process to cause the downstream escape of the organism is avoided.
The surface of the filter piece 12 is sprayed with an antifouling coating, and the antifouling coating comprises the following components in parts by weight: 23-32 parts of self-polishing resin, 4-8 parts of perchloroethylene, 12-16 parts of rosin, 28-41 parts of cuprous oxide and 2-4.5 parts of zinc pyrithione, and the preparation method of the coating comprises the following steps: mixing the components according to the weight ratio, dispersing for 13-21min on a dispersion machine, adding 0.02-0.03 part of 2, 6-dihydroxybenzoic acid and 0.01-0.013 part of biuret, uniformly stirring, standing for 5-10min, grinding on a sand mill to obtain an antifouling coating, coating the antifouling coating on the surface of a filter element 12, drying to form an antifouling coating, wherein the antifouling coating can obviously improve the antifouling performance of the surface of the filter element 12, the added 2, 6-dihydroxybenzoic acid and biuret can improve the molecular structure of rosin and reduce intermolecular force, so that the dispersion degree of the components is improved, the dispersion system is kept stable, the antifouling coating has excellent antifouling performance and crack resistance, the surface of the filter element 12 has excellent antifouling performance, and the situation that microorganisms or moss are bred due to the fact that the filter element 12 is in a water body with more residual baits and excrements for a long time is avoided, the fluency of collecting the residual baits and the excrements by the filter piece 12 is improved, and the self-cleaning capability of the filter piece 12 is also improved.
The drain pipe 11 passes through the sewage port 9, the ratio of the diameter of the drain pipe 11 to the diameter of the sewage port 9 is 1:1.9, the drain pipe 11 is formed by connecting the drain pipe 11 inside the culture pond 1 with the drain pipe 11 outside the culture pond 1, the drain pipe 11 and the sewage port 9 are arranged together, so that sewage and wastewater can be conveniently discharged, the ratio of the diameter of the drain pipe 11 to the diameter of the sewage port 9 not only improves the installation stability of the drain pipe 11, but also can ensure the smoothness of sewage discharged from the sewage port 9, the drain pipe 11 is divided into an inner part and an outer part, and the performance of the drain pipe.
Breed 1 inside drain pipe 11's in pond inside for dead lever 13, dead lever 13 surface is equipped with the scale mark, dead lever 13 surface nestification has electric lift ring 14, electric lift ring 14 lower extreme is connected with flexible pipe 15, breed 1 outside drain pipe 11 in pond and be drainage pipe, and dead lever 13 arranges and forms the polygon, forms upright water pipe behind the flexible pipe 15 of overcoat, and electric lift ring forms upright water pipeThe protruding pulley of the 14 inner walls of lift ring and the pulley nested connection on dead lever 13 surface, make electric lift ring 14 can reciprocate along dead lever 13, when electric lift ring 14 is in dead lever 13 top, flexible pipe 15 separation breed water, thereby realize normal breed, when electric lift ring 14 descends, flexible pipe 15 shortens, so the water that is higher than flexible pipe 15 flows in drain pipe 11 and discharges, flexible pipe 15's flexible makes drain pipe 11 have the function of blockking up water and drainage, and shorten the back when flexible pipe 15, naked dead lever 13 still can separate the major part pollutant, avoid the great pollutant of volume to get into drain pipe 11 and cause the jam, dead lever 13 surface is equipped with the scale mark, can calculate the displacement according to electric lift ring 14 descending distance, its displacement does: v is a × b × h, and V is the displacement (m)3) The length (m) of the culture pond 1 is a, the width (m) of the culture pond 1 is a b, and the exposed scale value (m) of the fixed rod 13 is a h, so that the wastewater discharge quantity can be quantitatively measured, the culture system has more accurate condition control, and the wastewater treatment effect and the culture effect are improved.
Breed 1 inside lateral wall in pond and be equipped with washing pipeline 8, wash 8 water spray directions of pipeline and be clockwise or anticlockwise, breed 8 water spray directions of washing pipeline of 1 inner wall in pond certain for spun water forms certain rotatory rivers, thereby improves incomplete bait and faecal discharge, improves the cleaning performance.
The microalgae culture is carried out in the photobioreactor 2, the wastewater in the culture pond 1 is sent into the photobioreactor 2 through the drain pipe 11, the retention time of the wastewater in the photobioreactor 2 is 1.1d, the microalgae culture effect of the photobioreactor 2 is good, the retention time of the wastewater in the photobioreactor 2 is controlled, the wastewater purification effect can be improved, the microalgae can have good activity, the purification time can be shortened, and the water circulation period can be shortened.
Conventional techniques in this embodiment are known to those skilled in the art and will not be described in detail here.
Example 3:
as shown in fig. 10, which is a block diagram of an operation flow of a circulating mariculture system based on a microalgae membrane bioreactor, as shown in the figure, a culture pond outputs culture wastewater to a photobioreactor, the photobioreactor is used for culturing microalgae, algae liquid in the photobioreactor is conveyed to a microalgae concentration pond after the microalgae absorbs nitrogen ammonia and phosphate in the culture wastewater to below a monitoring limit, the algae liquid is subjected to ultrafiltration membrane components to obtain clean water with excellent water quality, the clean water is output to the culture pond for biological culture again, in the microalgae concentration pond, part of the algae liquid outside the ultrafiltration membrane components is conveyed back to the photobioreactor again, and the other part of the algae liquid is harvested and processed into cultured biological feed and fed to the culture pond, so that the water for culture and nutrient elements in the culture system are recycled.
Conventional techniques in this embodiment are known to those skilled in the art and will not be described in detail here.
Example 4:
as shown in figures 1-10, a circulating seawater culture system based on a microalgae membrane bioreactor comprises a culture pond 1, wherein the culture pond 1 is connected with a photobioreactor 2, the photobioreactor 2 is connected with a microalgae concentration pond 3 through a water pump 5, an ultrafiltration membrane component 4 is arranged in the microalgae concentration pond 3, a water outlet of the ultrafiltration membrane component 4 is connected with the culture pond 1 through the water pump 5, a sewage port 9 and a water drain pipe 11 are arranged at the center of the culture pond 1, microporous diffusers 7 are arranged at the bottoms of the photobioreactor 2 and the microalgae concentration pond 3, the microporous diffusers 7 are connected with an air compressor 6, and 4% of CO is introduced into the photobioreactor 22Air of 1.4m intake strength3/(m3d) Aerating, namely introducing air into the microalgae concentration tank 3, and controlling the strength to be 0.55m3/(m3d) And (3) aerating, namely conveying the concentrated algae liquid back to the photobioreactor 2 through a water pump 5 by the microalgae concentration tank 3, keeping the concentration of the algae liquid in the photobioreactor 2 at 1.2g/L, harvesting and processing the concentrated microalgae in the microalgae concentration tank 3 to prepare bait, and feeding the bait to the culture tank 1.
The bottom of the sewage port 9 is connected with a sewage pipeline 10, the opening end of the sewage port 9 is provided with a filtering piece 12, the filtering piece 12 comprises a filtering plate 18, sewage holes 16 are uniformly distributed on the surface of the filtering plate 18, a blocking piece 17 is arranged between the sewage holes 16, the upper half part of the blocking piece 17 is a semicircle, and the lower half part of the blocking piece is a concave shape.
The drainage pipe 11 passes through the sewage port 9, the ratio of the diameter of the drainage pipe 11 to the diameter of the sewage port 9 is 1:2.1, the drainage pipe 11 is formed by connecting the drainage pipe 11 inside the culture pond 1 with the drainage pipe 11 outside the culture pond 1, a fixed rod 13 is arranged inside the drainage pipe 11 inside the culture pond 1, scale marks are arranged on the surface of the fixed rod 13, an electric lifting ring 14 is nested on the outer surface of the fixed rod 13, the lower end of the electric lifting ring 14 is connected with a telescopic pipe 15, the drainage pipe 11 outside the culture pond 1 is a drainage pipe, a cleaning pipeline 8 is arranged on the side wall inside the culture pond 1, and the water spraying direction.
Microalgae are cultured in the photobioreactor 2, wastewater in the culture pond 1 is sent into the photobioreactor 2 through the drain pipe 11, and the retention time of the wastewater in the photobioreactor 2 is 1.3 d.
Carry out TN in the breed waste water, TP content clearance experiment under this embodiment system setting condition, the waste water inflow of controlling experiment every time is the same, initial TN in the test waste water influent, TP concentration and play aquatic TN, TP concentration, its absorption clearance computational formula is:
The results of the experiment are as follows:
as can be seen from the experimental data in the table, the culture system removes TN and TP in the culture wastewater based on membrane method microalgae culture, the removal effect is more than 90%, the removal effect is good, the stability is high, and the culture system can realize the cyclic utilization of the culture water.
Conventional or prior art connections in the above-described embodiments are known to those skilled in the art and will not be described in detail herein.
The above embodiments are merely illustrative, and not restrictive, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention, and the protection scope of the present invention should be defined by the claims.
Claims (3)
1. A circulating seawater culture system based on a microalgae membrane bioreactor comprises a culture pond (1) and is characterized in that the culture pond (1) is connected with a photobioreactor (2), the photobioreactor (2) is connected with a microalgae concentration pond (3) through a water pump (5), an ultrafiltration membrane component (4) is arranged in the microalgae concentration pond (3), a water outlet of the ultrafiltration membrane component (4) is connected with the culture pond (1) through the water pump (5), and a sewage port (9) and a drain pipe (11) are arranged in the center of the culture pond (1);
the bottom of the photobioreactor (2) and the bottom of the microalgae concentration tank (3) are both provided with a micropore diffuser (7), the micropore diffuser (7) is connected with an air compressor (6), and 4% of CO is introduced into the photobioreactor (2)2The microalgae concentration tank (3) is aerated with air;
the bottom of the sewage port (9) is connected with a sewage discharge pipeline (10), the opening end of the sewage port (9) is provided with a filtering piece (12), the filtering piece (12) comprises a filtering plate (18), sewage discharge holes (16) are uniformly distributed on the surface of the filtering plate (18), a blocking piece (17) is arranged between the sewage discharge holes (16), the upper half part of the blocking piece (17) is semicircular, and the lower half part of the blocking piece is concave;
the microalgae concentration tank (3) conveys the concentrated algae liquid back to the photobioreactor (2) through a water pump (5), the concentration of the algae liquid in the photobioreactor (2) is kept to be 1.0-1.5g/L, and the concentrated microalgae in the microalgae concentration tank (3) is harvested and processed to be made into bait and fed into the culture tank (1);
the drain pipe (11) penetrates through the sewage port (9), the ratio of the diameter of the drain pipe (11) to the diameter of the sewage port (9) is 1:1.8-2.4, and the drain pipe (11) is formed by connecting a drain pipe inside the culture pond (1) and a drain pipe outside the culture pond (1);
the inside of the internal drain pipe of the culture pond (1) is provided with a fixed rod (13), the surface of the fixed rod (13) is provided with scale marks, and the fixed rod is fixedDecide pole (13) surface nestification have electric lift ring (14), electric lift ring (14) lower extreme is connected with flexible pipe (15), breed pond (1) outside drain pipe and be drainage pipe, the fixed rod surface is equipped with the scale mark, can calculate displacement according to electric lift ring descending distance, and its displacement is: v is a × b × h, and V is a displacement (m)3) A is the length (m) of the culture pond, b is the width (m) of the culture pond, and h is the bare scale value (m) of the fixed rod;
the fixed rods (13) are arranged to form a polygon, an upright water pipe is formed after the telescopic pipe (15) is sleeved outside the polygon, and the convex pulleys on the inner wall of the electric lifting ring (14) are connected with the pulleys on the surface of the fixed rods (13) in an embedded mode.
2. The circulating mariculture system based on the microalgae membrane bioreactor according to claim 1, wherein a cleaning pipeline (8) is arranged on the inner side wall of the culture pond (1), and the water spraying direction of the cleaning pipeline (8) is clockwise or anticlockwise.
3. The circulating mariculture system based on the microalgae membrane bioreactor as claimed in claim 1, wherein microalgae culture is performed in the photobioreactor (2), wastewater in the culture pond (1) is sent into the photobioreactor (2) through a drain pipe (11), and the retention time of the wastewater in the photobioreactor (2) is 1.0d-1.5 d.
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| CN110499245B (en) * | 2019-08-08 | 2023-06-23 | 浙江万里学院 | Microalgae in-situ expansion culture system for shellfish culture pond and use method thereof |
| CN110463647A (en) * | 2019-09-05 | 2019-11-19 | 威海金屹环保科技有限公司 | Based on microalgae-strain bio reactor circulating seawer cultivating system |
| CN113349128A (en) * | 2021-07-24 | 2021-09-07 | 宝莱水产种苗(海南琼海市)有限公司 | Industrial ecological breeding method of shrimp larvae with high stress resistance and disease resistance |
| CN114988653A (en) * | 2022-07-19 | 2022-09-02 | 中国科学院水生生物研究所 | Aquaculture system and method for improving utilization rate of nitrogen and phosphorus and reducing emission of nitrogen and phosphorus |
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