CN114835342B - Seawater crab offspring seed cultivating device and cultivating water self-circulation self-purification method - Google Patents
Seawater crab offspring seed cultivating device and cultivating water self-circulation self-purification method Download PDFInfo
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/166—Nitrites
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
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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
- 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
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Farming Of Fish And Shellfish (AREA)
Abstract
The invention discloses a seawater crab seed cultivation device and a self-circulation self-purification method of cultivation water.A water pumping filter pipe is fixed in a cultivation water tank of the cultivation device, the water pumping filter pipe is communicated with an air charging pipe and a water discharging pipe, a filter is communicated with a water discharging pipe connection, a wheel worm water return pipe and a filter water discharging pipe, the wheel worm water return pipe is communicated with the cultivation water tank, and a water return control valve and a water discharging pipe with a water discharging control valve are arranged on the wheel worm water return pipe; the ultraviolet sterilizer is respectively communicated with a filter water outlet pipe and a sterilizer water outlet pipe, the sterilizer water outlet pipe is communicated with the biological purifier, and the biological purifier is communicated with the culture water tank through a purified water return pipe; there is a water head difference between the filter, the ultraviolet sterilizer and the biological purifier. The cultivating device has the functions of filtering, sterilizing, reducing toxic inorganic nitrogen compounds and controlling the density and nutrition of biological baits. The self-circulation and self-purification method of the cultivation water can purify the cultivation water, prevent diseases and control bait density, and improve the quality of seedlings and the quantity of seedlings emerging in unit water.
Description
Technical Field
The invention relates to the technical field of aquaculture, in particular to a seawater crab seed cultivation device and a cultivation water self-circulation self-purification method.
Background
In the process of cultivating marine aquatic animal fries, key factors for determining whether the fries are successfully cultivated are mainly disease control, biological bait feeding density control and quality control and water quality control in a cultivation pool.
Disease is a key factor affecting the survival rate and quality of offspring seeds. In recent years, serious vibriosis, mycoses and virus diseases appear in the cultivation of aquatic offspring, especially crustacean offspring, so that the offspring cultivation and cultivation are seriously lost. Therefore, the control of the number of pathogenic microorganisms in the cultivation of aquatic offspring is a key technical requirement, and at present, bacteria breeding is inhibited mainly by using antibiotics and disinfectants, but the existing bacteria have strong drug resistance, multiple drug resistance often occurs, and at present, stable, safe and efficient aquatic antibiotic drugs are lacking; the disinfectant has strong irritation and cannot be used for a long time; the beneficial bacteria preparation is also one of selectable modes, but biological safety risks exist, and the effect is unstable due to the problems of uneven product quality and the like.
The control of the feeding density of the biological bait and the quality of the biological bait are also key factors for successful cultivation of the offspring seeds. The rotifer is one of main biological baits in the cultivation of aquatic offspring, is the most important initial baits for larvae of crustaceans and fishes, and can often cause the problem of overlarge density caused by self-propagation during feeding, if the water quality of seawater in the cultivation is changed too much to cause stress reaction of the larvae to die, if the water quality is not changed, the nutrition of the larvae is quickly degraded, and the development and survival of the larvae in later period are affected; the excessive breeding rotifers can compete with larvae for living space and excrete a great amount of toxic inorganic nitrogen compounds such as ammonia nitrogen, and dead rotifers are extremely easy to cause mass breeding of germs and induce diseases. Similarly, artemia nauplii obtained by hatching artemia cysts used in the middle and later stages have the same problems that nutrition rapidly disappears with the prolongation of time after hatching, and the body shape increases beyond the predatory capacity of larvae, so that the excessive artemia nauplii should be removed as soon as possible.
The water quality in the cultivation pool is also a key factor for the cultivation of the seedlings. Aquatic offspring seed larvae have high requirements on water quality, in the water environment of offspring seed cultivation pool, excrement generated by metabolism of larvae and biological baits and organic matters such as residual baits and excrement are decomposed, toxic inorganic matters such as nitrite and ammonia nitrogen are generated, and the larvae are subjected to stress reaction and even poisoning death when the concentration exceeds a certain value; these toxic inorganic substances also stimulate the mass propagation of germs and enhance the toxicity, thereby greatly affecting the survival rate. Under normal conditions, the problem is mainly solved by discharging seawater or fresh water in the pond and adding clean fresh water, but aquatic offspring larvae have higher requirements on water quality stability, and the aquatic offspring larvae are not required to be replaced by a large amount of toxic inorganic matters, so that the larvae are always affected by diseases and death due to stress reaction caused by severe environmental changes, and the resistance of the larvae is reduced. In the later period of larva cultivation, the organic matters in the cultivation pond are increased, and the decomposition speed of toxic inorganic matters such as nitrite and ammonia nitrogen is increased, so that the water exchange amount is increased, the water quality is kept stable, the survival rate of larva cultivation is improved, and the quality of cultivated seedlings is also affected.
Disclosure of Invention
In order to overcome the defects of the prior art, the first technical problem to be solved by the invention is to provide a seawater crab seed cultivation device which can self-circulate and self-purify cultivation water, control water quality, solve the problems of disease control and bait density control, realize ecological seedling raising without antibiotics, improve seed quality and unit water quantity, reduce tail water discharge and protect ecological environment.
In order to solve the first technical problem, the invention adopts the following technical scheme:
a seawater crab offspring seed cultivation apparatus comprising: the culture water tank is characterized in that,
the culture water tank is fixedly provided with a pumping filter pipe, an air charging pipe communicated with the pumping filter pipe is fixed in the pumping filter pipe, and the air blower is connected with the air charging pipe; the bottom end of the pumping filter pipe is provided with an inclined plane and a first filter screen, and the bottom end of the air charging pipe is inserted with an air stone;
the water pumping filter pipe is communicated with a filter through a water outlet pipe, the filter is communicated with a wheel worm water return pipe and a filter water outlet pipe, the wheel worm water return pipe is communicated with the culture water tank, a water return control valve and a water outlet pipe are arranged on the wheel worm water return pipe, and a water outlet control valve is arranged on the water outlet pipe;
the filter water outlet pipe is communicated with an ultraviolet sterilizer, the ultraviolet sterilizer is communicated with a sterilizer water outlet pipe, the sterilizer water outlet pipe is communicated with a biological purifier, and the biological purifier is communicated with the culture water tank through a purified water return pipe;
the ultraviolet sterilizer is provided with a sterilizer water inlet connected with the filter water outlet pipe and a sterilizer water outlet connected with the sterilizer water outlet pipe, and the sterilizer water inlet and the sterilizer water outlet are both lower than the filter and the biological purifier; the water purification return pipe is higher than the liquid level of the culture water tank, the filter is provided with a filter inlet connected with the water outlet pipe, and the position of the filter inlet is higher than the position of the water purification return pipe;
the filter comprises a first filter chamber and a second filter chamber, wherein at least one layer of filter screen is arranged in the first filter chamber, a porous filter box is arranged in the second filter chamber, and a porous plastic block, a hairbrush, a polyethylene wire group and a bacterial membrane capable of absorbing toxic substances are arranged in the porous filter box.
Preferably: the filter tube that draws water sets up to thin down thick reducing pipe, draw water the filter tube including the expansion pipe portion that is located the bottom, a plurality of holes of permeating water have been seted up to the lower part global of expansion pipe portion, the bottom of expansion pipe portion sets up to the inclined plane, first filter screen cladding is in the hole of permeating water that expansion pipe portion set up with outside the inclined plane, the gas stone is located in the expansion pipe portion.
Preferably: the wheel worm return pipe is fixedly communicated with the first filtering chamber of the filter, the filter outlet pipe is fixedly communicated with the second filtering chamber, and a filter outlet pipe control valve is arranged on the filter outlet pipe.
Preferably: the biological purifier is made of transparent materials.
Preferably: the water pumping filter pipe, the water outlet pipe and the water purifying return pipe are all PVC pipes, and the filter water outlet pipe and the sterilizer water outlet pipe which are respectively arranged at two ends of the sterilizer are PU steel wire hoses.
Preferably: the water pumping filter pipe is fixed on the tank wall of the culture water tank through a fixer, the fixer comprises a sleeve, a clamp plate frame, an inner gasket and an outer gasket, the sleeve is fixedly sleeved on the water pumping filter pipe through a fastening bolt, the sleeve is fixedly connected with the clamp plate frame, the clamp plate frame comprises an inner clamp plate, an outer clamp plate and a long bolt, the inner gasket is positioned between the inner clamp plate and the tank wall of the culture water tank, the outer gasket is positioned between the outer clamp plate and the tank wall of the culture water tank, the long bolt is in threaded connection with the outer clamp plate, the tail end of the long bolt abuts against the outer gasket on the tank wall of the culture water tank, the inner gasket is arranged as a rubber gasket, the outer gasket comprises a stainless steel gasket and a rubber gasket, and the stainless steel gasket is fixedly connected with the rubber gasket.
In order to overcome the defects of the prior art, the second technical problem to be solved by the invention is to provide a self-circulation and self-purification method of water for cultivating sea crab seedlings, which is used for purifying the water for cultivating sea crab seedlings, controlling the water quality, solving the problems of disease control and bait control, realizing ecological seedling cultivation without antibiotics and improving the quality of seedlings and the quantity of seedlings in unit water body.
In order to solve the second technical problem, the invention adopts the following technical scheme:
a self-circulation and self-purification method for water for aquatic offspring seed cultivation is characterized in that:
the method comprises the following steps:
a. air floatation pressurized water: the air blower is turned on, so that air is blown into the inflation tube from the pipeline of the air blower, the air is differentiated into bubbles after passing through the air stones, the bubbles in the pumping filter tube rise to drive seawater to flow upwards, the water level in the pumping filter tube rises to enable the seawater to enter the water outlet tube, under the action of water pressure, the seawater in the culture water tank continuously passes through the first filter screen to enter the pumping filter tube, the first filter screen blocks the passage of seawater crab larvae, and the rotifers and artemia nauplii can enter the pumping filter tube through the first filter screen.
b. And (3) filtering by a filter: seawater flows into a first filtering chamber of the filter through an air floating pipe of the water outlet pipe, a filtering net for preventing the passage of wheel worms is arranged in the first filtering chamber,
the seawater passing through the first filtering chamber enters the second filtering chamber, then passes through the second filtering chamber, the porous plastic block, the hairbrush and the polyethylene silk cluster in the second filtering chamber adsorb small particles and colloid in the seawater, the porous plastic block, the hairbrush and the polyethylene silk cluster are used as attachment groups to be added into bacillus subtilis to form a bacterial film, and the bacterial film absorbs nitrite and ammonia nitrogen in the seawater;
c. sterilizing by an ultraviolet sterilizer: seawater in the second filtering chamber enters the ultraviolet sterilizer through the water outlet pipe of the filter, and the ultraviolet sterilizer kills more than 99.9 percent of vibrio, harmful protozoa and viruses in the seawater;
d. purifying by a biological purifier: seawater in the ultraviolet sterilizer enters the biological purifier through the water outlet pipe of the sterilizer, and a proper amount of seaweed is put into the biological purifier to absorb nitrite and toxic inorganic nitrogen compounds in the seawater;
e. and (3) returning purified water: seawater flowing out of the biological purifier flows back to the culture water tank through the purified water return pipe.
Preferably: in the step of filtering by the filter, a filter screen for preventing the passage of large solid particles is further arranged in the first filter chamber, and the filter screen for preventing the passage of large solid particles is arranged behind the filter screen for preventing the passage of the wheel worm.
Preferably: the step a, b, c, d, e is performed simultaneously with the following steps:
f. controlling the density of the rotifers: when the density of the rotifers is proper, a backwater control valve on the rotifer backwater pipe is opened, a drainage control valve on the drain pipe is closed, and the sea water containing the rotifers flows into the culture water tank from the rotifer backwater pipe;
when the density of the rotifer is too high, a backwater control valve on the rotifer backwater pipe is opened, a drainage control valve on the drain pipe is closed, a net bag is added at the outlet end of the rotifer backwater pipe, and redundant rotifers are filtered out and collected for later use.
Preferably: after the a, b, c, d, e step, the method further comprises the following steps:
g. changing water: when the water quality is deteriorated after circulation for many times, the backwater control valve and the filter water outlet pipe control valve are closed, the drainage control valve is opened, the water in the culture water tank can be discharged out of the culture water tank, after the water reaches the designated water level, the backwater control valve and the filter water outlet pipe control valve are opened, the drainage control valve is closed, new water is injected into the culture water tank to reach the original water level, and the system returns to the normal running state.
After the technical scheme is adopted, the invention has the beneficial effects that:
the culture water tank of the seawater crab seed culture device is fixedly provided with a water pumping filter pipe, an air charging pipe communicated with the water pumping filter pipe is fixed in the water pumping filter pipe, and an air blower is connected with the air charging pipe; the bottom end of the water pumping filter pipe is provided with an inclined plane and a first filter screen, the bottom end of the air charging pipe is inserted with an air stone, the purpose of water circulation flow is achieved by adopting an air floatation principle, water in the culture water tank is conveyed to a subsequent filter, an ultraviolet sterilizer and a biological purifier after passing through the water pumping filter pipe, and after the three links, the discharged water is cleared of impurities, harmful microorganisms are killed, toxic ions are removed, and the discharged water is high-quality water, so that the water exchanging amount of a conventional method can be reduced by more than 80%, and the heating fuel and labor cost generated in the working content are saved by more than 80%. The use cost of antibiotics is reduced by ultraviolet sterilization, the power consumption of an ultraviolet sterilizer is low (an ultraviolet lamp with the water treatment quantity of 1 cubic meter per hour only being 25W) and the cost can be reduced by more than 80 percent.
When the density of the rotifers is normal, water with the rotifers enters the culture water tank through the rotifer return water pipe, so that the automatic recycling of baits such as the rotifers is ensured; when the density of the rotifer is excessive, a net bag is added at the water return pipe orifice of the rotifer to filter out and collect the excessive rotifer, and the rotifer can be used later. The density of the rotifers in the culture water tank is controlled while the water circulation purification is ensured.
The ultraviolet sterilizer is provided with a sterilizer water inlet connected with the filter water outlet pipe and a sterilizer water outlet connected with the sterilizer water outlet pipe, and the sterilizer water inlet and the sterilizer water outlet are lower than the filter and the biological purifier; the water purification return pipe is higher than the liquid level of the culture water tank, the filter is provided with a filter inlet connected with the water outlet pipe, and the position of the filter inlet is higher than the position of the water purification return pipe. The filter, the ultraviolet sterilizer, the biological purifier and the water level difference among the three are skillfully arranged, so that the seawater crab seed cultivation device is continuously circulated.
The seawater crab seed cultivation device provided by the invention adopts the air floatation principle to achieve the purpose of water circulation flow, does not need an electric water pump system, saves electric power, and enhances the use safety.
In conclusion, the seawater crab seed cultivation device integrates the functions of filtering, sterilizing, reducing the density and nutrition of biological baits such as toxic inorganic nitrogen compounds, artificial controllable rotifers and the like, has the functions of keeping water quality stable and removing the toxic inorganic nitrogen compounds, reduces tail water discharge, reduces antibiotic discharge, has remarkable ecological benefit, creates good conditions for improving the cultivation density of aquatic offspring seeds, and can improve the quantity of seedlings emerging from a unit water body while improving the quality of the offspring seeds.
The self-circulation and self-purification method of the seawater crab seed cultivation water provided by the invention is to purify the seawater crab seed cultivation water by utilizing the seawater crab seed cultivation device, control the water quality, solve the problems of disease control and bait control, realize ecological seedling cultivation without antibiotics, and improve the quality of the seedlings and the quantity of seedlings in unit water body.
Drawings
FIG. 1 is a schematic view of a seawater crab seed cultivation device according to the present invention;
FIG. 2 is a schematic illustration of the filter of FIG. 1;
FIG. 3 is a schematic view of a high level arrangement of filters, UV sterilizers and biological purifiers;
FIG. 4 is a schematic view of an exploded construction of the holder;
in the figure:
1. a culture water tank; 2. pumping water and filtering the pipe; 20a, an enlarged tube portion; 201a, water permeable holes; b. a gas stone; 201. a water outlet pipe; 202. a first filter screen; 203. an inflation tube; 203a, a gas flow control valve; 3. a filter; 30. a front filter screen; 31. the latter filter screen; 32. a porous filtration cartridge; 3a, a first filtering chamber; 3b, a second filtering chamber; 301. a wheel worm return pipe; 3011. a backwater control valve; 3012. a drain pipe; 3013. a drain control valve; 3014. a wheel worm backwater pipe orifice; 302. a filter outlet pipe; 3021. a filter outlet pipe control valve; 303. a filter inlet; 4. an ultraviolet sterilizer; 401. a sterilizer water outlet pipe; 402. a sterilizer water inlet; 403. a sterilizer water outlet; 5. a biological purifier; 6. a water purifying return pipe; 7. a holder; 701. a sleeve; 703. a clamping plate frame; 7031. an inner clamping plate; 7032. an outer clamping plate; 7033. a long bolt; 701. a sleeve; 704. a fastening bolt; 705. an inner gasket; 706. an outer gasket; 7061. stainless steel gaskets; 7062. a rubber gasket; 7063. and (5) a blind hole.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
The seawater crab seed cultivation device shown in fig. 1 to 3, wherein a water pumping filter pipe 2 is fixed on a cultivation water tank 1, the water pumping filter pipe 2 is communicated with a water drawing power device, the water pumping filter pipe 2 is communicated with a filter 3 through a water outlet pipe 201, the filter 3 is communicated with a wheel worm water return pipe 301 and a filter water outlet pipe 302, the wheel worm water return pipe 301 is communicated with the cultivation water tank 1, a water return control valve 3011 and a water outlet pipe 3012 are arranged on the wheel worm water return pipe 301, and a water outlet control valve 3013 is arranged on the water outlet pipe 3012;
the filter water outlet pipe 302 is communicated with an ultraviolet sterilizer 4, the ultraviolet sterilizer 4 is communicated with a sterilizer water outlet pipe 401, the sterilizer water outlet pipe 401 is communicated with a biological purifier 5, and the biological purifier 5 is communicated with the culture water tank 1 through a purified water return pipe 6; a control valve is provided on the filter outlet pipe 302.
As shown in fig. 3, the ultraviolet sterilizer 4 is provided with a sterilizer water inlet 402 connected with the filter water outlet pipe 302 and a sterilizer water outlet 403 connected with the sterilizer water outlet pipe 401, and the sterilizer water inlet 402 and the sterilizer water outlet 403 are lower than the filter 3 and the biological purifier 5; the clean water return pipe 6 is higher than the liquid level of the culture water tank 1, the filter 3 is provided with a filter inlet 303 connected with the water outlet pipe 201, and the position of the filter inlet 303 is higher than the position of the clean water return pipe 6.
As shown in fig. 1, the water pumping filter pipe 2 is configured as a reducer pipe with a thin upper part and a thick lower part, the water pumping filter pipe 2 comprises an enlarged pipe part 20a positioned at the bottom, a plurality of water permeable holes 201a are formed in the peripheral surface of the lower part of the enlarged pipe part 20a, the bottom end of the enlarged pipe part 20a is configured as an inclined surface, the enlarged pipe part 20a is provided with a first filter screen 202, the inclined surface and the water permeable holes 201a are covered by the first filter screen 202, and the air stone is positioned in the enlarged pipe part 20a.
The inclined surface of the enlarged tube portion 20a is preferably: the inclined plane opening forms an included angle of 30 degrees to 45 degrees with the pipe, on the one hand, can increase the drainage area, on the other hand, the inclined plane does not influence the rivers in the culture water tank 1, and the larva is difficult to be adsorbed on the first filter screen 202 and damaged. In addition, holes may be densely perforated in the side peripheral surface of the enlarged pipe portion 20a to increase the area of the first filter screen 202 covering the holes in the side peripheral surface to increase the water filtering area. To increase the fluidity of the seawater around the bottom of the air-bearing tube, an air-filled tube 203 is added near the expanded tube portion 20a.
The meshes of the first filter screen 202 are used for blocking the passage of larvae, enabling the particulate matters in water and artemia nauplii with density to pass through, enabling the larvae to gradually grow with the growth of the larvae, and enabling the first filter screen 202 to sequentially pass through from 120 meshes to 80 meshes, 60 meshes and 40 meshes.
The water drawing power device comprises an air charging blower (not shown in the figure) and an air charging pipe 203, the air charging pipe 203 is fixed in the water pumping filter pipe 2, the air charging pipe 203 is communicated with the water pumping filter pipe 2, an air flow control valve 203a is arranged on the air charging pipe 203, an air stone b is inserted into the bottom end of the air charging pipe 203, and the air stone b is located in the middle of the expansion pipe portion 20a.
The water drawing power device can be also arranged as a water pump, the water pump needs to be arranged far away from the culture water tank 1 for electricity safety, and a water pipe connected between the water pump and the water drawing filter pipe 2 needs to be arranged for a long time, so that strict requirements are placed on the power of the water pump.
When the water drawing power device is provided with the air charging blower and the air charging pipe 203, the air charging blower charges air into the air charging pipe 203, water is lifted through the water pumping filter pipe 2 under the air floatation effect, and the water in the water pumping filter pipe 2 flows into the filter 3 through the water outlet pipe 201.
Because the pumping filter pipe 2 is a reducer pipe with a thin upper part and a thick lower part, the area of the first filter screen 202 is large enough by the expansion pipe part 20a at the bottom, the upward circulation of water is not influenced, and the pressure of flowing water is reduced by the increased area of the first filter screen 202, so that the damage to larvae is avoided; the purpose of the thinning on the reducer pipe is to make the water lift higher and increase the flow.
The air stone b is inserted at the bottom end of the air charging pipe 203, small bubbles are formed after the air passes through the air stone b, the bubbles rapidly rise in the water and drive the water to flow upwards, and therefore the water can flow out from the overflow port after being higher than the water surface of the cultivating pool. The water lifting height and overflow amount in the pumping filter pipe 2 can be controlled by the number of the air stones b and the air charging intensity, or by the air charging flow, the stronger the air charging is, the larger the water quantity is, the faster the water is lifted, and the air charging intensity is freely controlled according to the actual circulating intensity through the air flow control valve 203a on the air charging pipe 203.
The filter 3 comprises a first filter chamber 3a and a second filter chamber 3b, wherein at least one layer of filter screen is arranged in the first filter chamber 3a, and a solid adsorbate filter device is arranged in the second filter chamber 3 b. The wheel return pipe 301 is in fixed communication with the first filter chamber 3a of the filter 3. The solid adsorbate filtering device comprises a porous filtering box 32, wherein a porous plastic block, a hairbrush and a polyethylene wire cluster and a beneficial bacteria film which is formed by taking the materials as an adhesion base and can absorb toxic materials are placed in the porous filtering box 32.
The first filtering chamber 3a is internally provided with a clamping groove, and the filter screen is inserted into the clamping groove and can be taken out for cleaning and replacement as required. One filter screen or two filter screens can be arranged in the first filter chamber 3 a. The former filter screen 30 is a necessary screen, and the mesh of the filter screen is 250 meshes, and the function of the filter screen is to block the wheel worms and enable the wheel worms to enter the wheel worm return pipe 301; the effect of the latter filter screen 31 is to filter and remove larger solid particles in the cultivation water, so that the seawater becomes clear, a good condition is created for the next ultraviolet disinfection, the mesh of the filter screen is 300 meshes, and if the solid particles are very clear, the latter filter screen 31 can be omitted.
The combination of the rotifer water return pipe 301, the water return control valve 3011, the water drain control valve 3013 and the filter water outlet pipe control valve 3021 controls the number of rotifers and also takes into account the water changing effect. After three links of filtering by the filter 3, sterilizing by the ultraviolet sterilizer 4 and purifying by the biological purifier 5, the water flowing out is cleared by sundries, harmful microorganisms are killed, toxic ions are removed, and high-quality water is obtained. According to measurement and calculation, the water in the culture water tank 1 with the volume of 1 cubic meter is completely circulated for only 1-2 hours, if the circulation speed is high, the absorption rate of nitrite and ammonia nitrogen in the flowing water volume can be reduced, but the absorption rate per unit time can be increased, the reduction speed of the content in the culture pond is not influenced, and the absorption rate is improved.
The water passing through the first filtering chamber is primarily cleared, then enters the second filtering chamber 3b, porous plastic blocks, brushes, polyethylene silk clusters and the like with stronger adsorption capacity are placed in the porous filtering box, small particles and colloids can be adsorbed, and bacterial films can be formed after beneficial bacteria such as bacillus subtilis and the like are added so as to absorb part of toxic substances such as nitrite, ammonia nitrogen and the like. The porous filter box is convenient to clean and replace. The water passing through the filter removes most of the solid particles and becomes relatively clear, but still contains the original microorganisms, the poisonous inorganic nitrogen and the like, and the water passing through the filter 3 enters the ultraviolet sterilizer 4 through the outflow pipe of the filter water outlet pipe 302. And killing the residual vibrio, virus, harmful protozoa and other harmful microorganisms in the sea water by ultraviolet rays.
The water sterilized by ultraviolet rays flows into the biological purifier 5, and the biological purifier 5 is made of transparent materials. The biological purifier 5 is required to be fully transparent, is favorable for natural light to pass through and increase photosynthesis, can be made of transparent organic glass, can also be made of transparent plastic plates, and is filled with a proper amount of seaweed, in particular seaweed plants such as the hard-bristletail algae with high growth speed and low nutrient salt resistance, and the biological purifier 5 can ensure the illumination for more than 18 hours in the whole day through sunlight and an artificial light source (LED lamp) so as to absorb nitrite and ammonia nitrogen to the greatest extent. Nitrite and ammonia nitrogen in water can be mostly absorbed through bacterial membrane absorption in the filter 3 and seaweed absorption in the biological purifier 5.
The biological purifier 5 can be additionally provided with an artificial light source, and can be opened in cloudy days or at night to increase the illumination intensity and prolong the illumination time, thereby improving the photosynthesis of organisms and the absorption efficiency.
The connecting pipes among the filter 3, the ultraviolet sterilizer 4 and the biological purifier 5 are mainly connected through PVC pipe fittings, namely, the water outlet pipe 201, the purified water return pipe 6 and the water outlet pipe 3012 are all PVC pipes, and other nontoxic and corrosion-resistant hard material pipe fittings can also be adopted. In order to flexibly control the water level difference among the filter 3, the ultraviolet sterilizer 4 and the biological purifier 5, the filter water outlet pipe 302 and the sterilizer water outlet pipe 401 which are respectively arranged at two ends of the ultraviolet sterilizer 4 can be made of PU steel wire hoses, or the plane positions among the three can be changed at the same time.
As shown in fig. 1 and 4 together, the pumped filter tube 2 is fixed on the tank wall of the culture tank 1 through the fixer 7, the fixer 7 comprises a sleeve 701, a clamp plate frame 703, an inner gasket 705 and an outer gasket 706, the sleeve 701 is fixedly sleeved on the pumped filter tube 2 through a fastening bolt 704, the fastening bolts 704 are two, the sleeve 701 can be fixed on the pumped filter tube 2 through tightening the fastening bolts 704, the sleeve is fixedly connected with the clamp plate frame, the clamp plate frame 703 comprises an inner clamp plate 7031, an outer clamp plate 7032 and a long bolt 7033, the inner gasket 705 is positioned between the inner clamp plate 7031 and the tank wall of the culture tank 1, the outer gasket 706 is positioned between the outer clamp plate 7032 and the tank wall of the culture tank 1, the long bolt 7033 is in threaded connection with the outer clamp plate 7032, the tail end of the long bolt 7033 abuts the outer gasket 706 on the tank wall of the culture tank 1, the inner gasket 705 is provided as a rubber gasket, and the outer gasket 706 comprises a stainless steel gasket 7061 and a 7062 which is fixedly connected with the stainless steel gasket 7062. The stainless steel gasket 7061 is provided with a blind hole 7063, the blind hole 7063 is formed by intersecting a round blind hole and a square blind hole, and when the outer gasket 706 is installed, the tail end of a long bolt 7033 installed on the outer clamping plate 7032 slides to the square blind hole from the round blind hole, so that the long bolt 7033 is screwed to abut the outer gasket 706 on the wall of the culture water tank 1.
The self-circulation and self-purification method for the seawater crab seed cultivation water by using the seawater crab seed cultivation device comprises the following steps:
a. air floatation pressurized water: the blower (not shown in the figure) is turned on, so that air is blown into the air charging pipe 203 from the pipeline of the blower, the air is differentiated into bubbles after passing through the air stone b, the bubbles in the pumping filter pipe 2 rise to drive the seawater to flow upwards, the water level in the pumping filter pipe 2 rises to enter the water outlet pipe 201, under the action of water pressure, the seawater in the culture water tank 1 continuously passes through the first filter screen 202 to enter the pumping filter pipe 2, the first filter screen 202 blocks the seawater crab larvae from passing through, and the artemia and artemia nauplii can enter the pumping filter pipe 2 through the first filter screen 202.
b. And (3) filtering by a filter: seawater flows into the first filtering chamber 3a of the filter 3 through the water outlet pipe 201, a filter screen (i.e., the previous filter screen 30) for preventing the passage of wheel worms is provided in the first filtering chamber 3a,
the seawater passing through the first filtering chamber 3a enters the second filtering chamber 3b, then passes through the second filtering chamber 3b, the porous plastic block, the hairbrush and the polyethylene silk ball in the second filtering chamber 3b adsorb small particles and colloid in the seawater, the porous plastic block, the hairbrush and the polyethylene silk ball are used as adhesion groups to be added into bacillus subtilis to form a bacterial film, and the bacterial film absorbs nitrite, ammonia nitrogen and other toxic inorganic nitrogen compounds in the seawater;
c. sterilizing by an ultraviolet sterilizer: the seawater in the second filtering chamber 3b enters the ultraviolet sterilizer 4 through the filter water outlet pipe 302, and the ultraviolet sterilizer 4 kills vibrio, toxic inorganic nitrogen, partial harmful organisms and partial viruses in the seawater;
d. purifying by a biological purifier: seawater in the ultraviolet sterilizer 4 enters the biological purifier 5 through the sterilizer water outlet pipe 401, and a proper amount of seaweed is put into the biological purifier 5 to absorb nitrite and ammonia nitrogen in the seawater;
e. and (3) returning purified water: seawater flowing out of the biological purifier 5 flows back to the culture tank 1 through the purified water return pipe 6.
Preferably, in the step of filtering by the filter, a filter screen (i.e. the latter filter screen 31) for preventing the passage of large solid particles is further disposed in the first filtering chamber 3a, and the filter screen for preventing the passage of large solid particles is disposed behind the filter screen for preventing the passage of rotifers.
The step a, b, c, d, e is performed simultaneously with the following steps:
f. controlling the density of the rotifers: when the density of the rotifers is proper, the density and nutrition of the rotifers in the culture water tank 1 are normal, a backwater control valve 3011 on the rotifer backwater pipe 301 is opened, a drainage control valve 3013 on the drainage pipe 3012 is closed, and the sea water containing the rotifers flows into the culture water tank 1 from the rotifer backwater pipe 301;
when the density of the rotifers is too high or nutrition is degraded, and meanwhile, under the condition that water is not needed to be changed, a water return control valve 3011 on the rotifer water return pipe 301 is opened, a water discharge control valve 3013 on the water discharge pipe 3012 is closed, a net bag is added to a rotifer water return pipe orifice 3014, redundant rotifers are filtered out and collected for standby, and water is circulated back to the culture water tank 1.
After the a, b, c, d, e step, the method further comprises the following steps:
g. changing water: when the water quality is deteriorated after the circulation for many times, the water is changed, the backwater control valve 3011 and the filter water outlet pipe control valve 3021 are closed, the drainage control valve 3013 is opened, the water in the culture water tank 1 can be discharged out of the tank, after the water reaches the designated water level, the backwater control valve 3011 and the filter water outlet pipe control valve 3021 are opened, the drainage control valve 3013 is closed, the fresh water is injected into the culture water tank 1 to reach the raw water level, and the system returns to the normal running state.
The seawater crab seed cultivation device has the following advantages:
1) When the water drawing power device is arranged as the air charging blower and the air charging pipe 203, the purpose of water circulation flow is achieved by adopting the air floating principle, an electric water pump system is not needed, electric power is saved, and meanwhile, the use safety is enhanced. The system can be started by opening the inflation knob, the running speed can be regulated by the air quantity control valve, and the operation is extremely simple.
2) The density of the rotifers in the culture water tank is controlled while the water circulation and purification are ensured by adopting the rotifer return pipe 301. When the density of the rotifers is normal, water with the rotifers enters the culture water tank 1 through the rotifer return water pipe 301, so that the automatic recycling of baits such as the rotifers is ensured; when the density of the rotifers is excessive, a net bag can be added at the tail end of the rotifer return pipe 301 to filter out the excessive rotifers for collection, and the rotifers can be used later.
The predatory capacity of the crab larvae is weak, the requirement on nutrition of biological baits is very high, the predatory requirement can be met better only under the condition of higher bait density, but the higher density of the rotifers is often excessive, the nutrition of the excessive rotifers can be consumed rapidly and self, the nutrition requirement of the crab larvae is not met, and a proper balance point is very difficult to control under the normal condition. After overfeeding, the rotifers can be removed only by a large amount of water change, but the measure is difficult to control because the water quality change is large due to the large amount of water change, and the larvae are dead due to stress reaction. The seawater crab seed cultivating device disclosed by the invention has the advantages that the problem of excessive rotifers is solved, the stability of water quality is ensured, and a large amount of manual labor is not required by a mode of filtering out excessive rotifers and automatically flowing back water. A new feeding strategy is formed, sufficient quantity of rotifers with enhanced operation and culture are fed, the sea water crab offspring seed cultivation device is started to filter out redundant rotifers when crab larvae are fed, the rotifers with enhanced operation and culture can be fed when fed next time, high nutrition guarantee of the rotifers is always maintained, the immunity of the larvae is improved, and the physique is enhanced. The same applies when feeding artemia nauplii.
3) The seawater in the cultivation pool is continuously purified and disinfected through three links of filtering, ultraviolet disinfection and biological purification, so that harmful microorganisms such as bacteria, viruses and protozoa in the seawater are always at a low level, nitrite and ammonia nitrogen excreted by larvae and biological baits are always at a low level, stress reaction of the larvae can be reduced by reducing the content of toxic inorganic nitrogen compounds, the probability of contamination can be greatly reduced by reducing the density of pathogenic microorganisms, and the 'non-resistance' seedling culture can be realized in a low-bacteria environment. The combination of the two beneficial factors can obviously improve the survival rate of crab larvae and cultivate high-quality seedlings.
The use of antibiotics is reduced by ultraviolet sterilization, so that the use cost of the antibiotics is reduced, and the cost can be reduced by more than 80 percent. In addition, the emission of antibiotics is reduced, and the ecological benefit is remarkable.
4) The filtering link of the seawater crab seed cultivation device can be optimally combined according to the water quality cleaning condition, and when the water quality is very clear, adsorbates such as porous plastic blocks, brushes, polyethylene silk clusters and the like are not needed, so that the flow is simplified, and the running speed is improved; the filter screen and the adsorbate can be cleaned at any time, and the filter screen and the adsorbate can be washed by clean seawater at one time, so that the operation is simple. Even if the filter screen is not found in time after being dirty, seawater can flow back to the culture water tank 1 from the purified water return pipe 6, and the operation of the system is not affected; the only possible faults of the device are that the lamp tube in the ultraviolet sterilizer can be burnt out and the lamp tube can be replaced in time.
5) The seawater crab seed cultivation device can be used as a water exchange pipe, and a special water exchange device is not needed. When water is changed, the backwater control valve 3011 and the filter water outlet pipe control valve 3021 are closed, the drain control valve 3013 is opened, the water in the culture water tank 1 can be discharged out of the tank, after the water reaches a designated water level, the backwater control valve 3011 and the filter water outlet pipe control valve 3021 are opened, the drain control valve 3013 is closed, and fresh water is injected into the culture water tank 1 to reach the raw water level. In the prior art, a floating net cage is mainly arranged on the surface layer of a culture water tank, water is pumped out of the net cage, and larvae are often damaged due to adsorption on a water exchange net when the surface layer is changed. The seawater crab seed cultivating device disclosed by the invention has the advantages that water is changed from the bottom, firstly, the bottom seawater is dirtier than the surface seawater, the water changing efficiency is improved, secondly, the crab larvae have phototaxis, the gathering density of the middle upper layer is high, the density of the bottom layer is smaller, the larvae constitution of the bottom layer is weaker under the condition, the seawater crab seed cultivating device belongs to a part which can be eliminated, and the loss caused by the adsorption injury of the larvae by the bolting silk can be greatly reduced by changing the water from the bottom.
The device can reduce the water exchange amount by more than 80%, thereby saving the heating fuel and labor cost and reducing the cost by more than 80%.
In conclusion, the seawater crab larva cultivation device integrates the functions of filtering, sterilizing, reducing the density and nutrition of biological baits such as toxic inorganic nitrogen compounds, artificial controllable rotifers and the like, has the functions of keeping water quality stable and removing toxic inorganic nitrogen compounds, reduces the use of antibiotics, reduces the discharge of tail water and antibiotics therein, has obvious ecological benefit, creates good conditions for improving the cultivation density of crab larva, and can improve the larva quality and the amount of seedlings emergence of unit water.
The self-circulation and self-purification method of the seawater crab seed cultivation water provided by the invention is to purify the seawater crab seed cultivation water by utilizing the seawater crab seed cultivation device, control the water quality, solve the problems of disease control and bait control, realize ecological seedling cultivation without antibiotics, and improve the quality of the seedlings and the quantity of seedlings in unit water body.
While the invention has been described in detail with reference to the drawings, it will be understood by those skilled in the art that the invention is not limited to the foregoing embodiments, but various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A seawater crab offspring seed cultivation apparatus comprising: the culture water tank is characterized in that,
the culture water tank is fixedly provided with a pumping filter pipe, an air charging pipe communicated with the pumping filter pipe is fixed in the pumping filter pipe, and the air blower is connected with the air charging pipe; the bottom end of the pumping filter pipe is provided with an inclined plane and a first filter screen, and the bottom end of the air charging pipe is inserted with an air stone;
the water pumping filter pipe is communicated with a filter through a water outlet pipe, the filter is communicated with a wheel worm water return pipe and a filter water outlet pipe, the wheel worm water return pipe is communicated with the culture water tank, a water return control valve and a water outlet pipe are arranged on the wheel worm water return pipe, and a water outlet control valve is arranged on the water outlet pipe;
the filter water outlet pipe is communicated with an ultraviolet sterilizer, the ultraviolet sterilizer is communicated with a sterilizer water outlet pipe, the sterilizer water outlet pipe is communicated with a biological purifier, a proper amount of seaweed is put into the biological purifier to absorb nitrite and ammonia nitrogen in seawater, and the biological purifier is communicated with the culture water tank through a purified water return pipe;
the ultraviolet sterilizer is provided with a sterilizer water inlet connected with the filter water outlet pipe and a sterilizer water outlet connected with the sterilizer water outlet pipe, and the sterilizer water inlet and the sterilizer water outlet are both lower than the filter and the biological purifier; the water purification return pipe is higher than the liquid level of the culture water tank, the filter is provided with a filter inlet connected with the water outlet pipe, and the position of the filter inlet is higher than the position of the water purification return pipe;
the filter comprises a first filter chamber and a second filter chamber, the wheel worm return pipe is fixedly communicated with the first filter chamber of the filter, a filter screen for preventing wheel worm from passing through is arranged in the first filter chamber, a porous filter box is arranged in the second filter chamber, and a porous plastic block, a hairbrush, a polyethylene silk cluster and a bacterial film capable of absorbing toxic substances are arranged in the porous filter box;
the water pumping filter pipe is arranged to be a reducer pipe with a thin upper part and a thick lower part, the water pumping filter pipe comprises an expansion pipe part positioned at the bottom, a plurality of water permeable holes are formed in the peripheral surface of the lower part of the expansion pipe part, the bottom end of the expansion pipe part is arranged to be the inclined surface, the first filter screen is coated outside the water permeable holes and the inclined surface formed in the expansion pipe part, and the air stone is positioned in the expansion pipe part;
the filter outlet pipe is fixedly communicated with the second filter chamber, and a filter outlet pipe control valve is arranged on the filter outlet pipe.
2. A seawater crab seed rearing device according to claim 1, characterized in that: the biological purifier is made of transparent materials.
3. A seawater crab seed rearing device according to claim 1, characterized in that: the water pumping filter pipe, the water outlet pipe and the water purifying return pipe are all PVC pipes, and the filter water outlet pipe and the sterilizer water outlet pipe which are respectively arranged at two ends of the sterilizer are PU steel wire hoses.
4. A seawater crab seed rearing device according to claim 1, characterized in that: the water pumping filter pipe is fixed on the tank wall of the culture water tank through a fixer, the fixer comprises a sleeve, a clamp plate frame, an inner gasket and an outer gasket, the sleeve is fixedly sleeved on the water pumping filter pipe through a fastening bolt, the sleeve is fixedly connected with the clamp plate frame, the clamp plate frame comprises an inner clamp plate, an outer clamp plate and a long bolt, the inner gasket is positioned between the inner clamp plate and the tank wall of the culture water tank, the outer gasket is positioned between the outer clamp plate and the tank wall of the culture water tank, the long bolt is in threaded connection with the outer clamp plate, the tail end of the long bolt abuts against the outer gasket on the tank wall of the culture water tank, the inner gasket is arranged as a rubber gasket, the outer gasket comprises a stainless steel gasket and a rubber gasket, and the stainless steel gasket is fixedly connected with the rubber gasket.
5. A self-circulation and self-purification method for water for cultivating sea crab fries is characterized in that: based on the seawater crab seed cultivation device according to any one of claims 1 to 4,
the method comprises the following steps:
a. air floatation pressurized water: the method comprises the steps that a blower is started, air is blown into an inflation pipe from a pipeline of the blower, the air is differentiated into bubbles after passing through an air stone, the bubbles in a pumping filter pipe ascend to drive seawater to flow upwards, the water level in the pumping filter pipe ascend and enters a water outlet pipe, under the action of water pressure, the seawater in a culture water tank continuously passes through a first filter screen to enter the pumping filter pipe, the first filter screen blocks the passage of seawater crab larvae, and the rotifers and artemia nauplii can enter the pumping filter pipe through the first filter screen;
b. and (3) filtering by a filter: seawater flows into a first filtering chamber of the filter through a water outlet pipe, a filtering net for preventing the passage of wheel worms is arranged in the first filtering chamber,
the seawater passing through the first filtering chamber enters the second filtering chamber, then passes through the second filtering chamber, the porous plastic block, the hairbrush and the polyethylene silk cluster in the second filtering chamber adsorb small particles and colloid in the seawater, the porous plastic block, the hairbrush and the polyethylene silk cluster are used as attachment groups to be added into bacillus subtilis to form the bacterial film, and the bacterial film absorbs nitrite and inorganic nitrogen compounds in the seawater;
c. sterilizing by an ultraviolet sterilizer: seawater in the second filtering chamber enters the ultraviolet sterilizer through the water outlet pipe of the filter, and the ultraviolet sterilizer kills more than 99.9 percent of vibrio, harmful protozoa and viruses in the seawater;
d. purifying by a biological purifier: seawater in the ultraviolet sterilizer enters the biological purifier through the water outlet pipe of the sterilizer, and a proper amount of seaweed is put into the biological purifier to absorb nitrite and ammonia nitrogen in the seawater;
e. and (3) returning purified water: seawater flowing out of the biological purifier flows back to the culture water tank through the purified water return pipe;
the step a, b, c, d, e is performed simultaneously with the following steps:
f. controlling the density of the rotifers: when the density of the rotifers is proper, a backwater control valve on the rotifer backwater pipe is opened, a drainage control valve on the drain pipe is closed, and the sea water containing the rotifers flows into the culture water tank from the rotifer backwater pipe;
when the density of the rotifer is too high, a backwater control valve on the rotifer backwater pipe is opened, a drainage control valve on the drain pipe is closed, a net bag is added at the rotifer backwater pipe orifice, and redundant rotifers are filtered out and collected for standby.
6. The self-circulation and self-purification method of water for cultivating seawater crabs as claimed in claim 5, wherein the method comprises the following steps: in the step of filtering by the filter, a filter screen for preventing the passage of large solid particles is further arranged in the first filter chamber, and the filter screen for preventing the passage of large solid particles is arranged behind the filter screen for preventing the passage of the wheel worm.
7. The self-circulation and self-purification method of water for cultivating seawater crabs as claimed in claim 5, wherein the method comprises the following steps: after the step f, the method further comprises the following steps:
g. changing water: when the water quality is deteriorated after circulation for many times, the backwater control valve and the filter water outlet pipe control valve are closed, the drainage control valve is opened, the water in the culture water tank is discharged out of the tank, after the water reaches the designated water level, the backwater control valve and the filter water outlet pipe control valve are opened, the drainage control valve is closed, new water is injected into the culture water tank to reach the original water level, and the system returns to the normal running state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210539387.2A CN114835342B (en) | 2022-05-18 | 2022-05-18 | Seawater crab offspring seed cultivating device and cultivating water self-circulation self-purification method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210539387.2A CN114835342B (en) | 2022-05-18 | 2022-05-18 | Seawater crab offspring seed cultivating device and cultivating water self-circulation self-purification method |
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