阅读说明：本技术 一种循环水养殖的方法及系统 (Method and system for recirculating aquaculture ) 是由 易志辉 于 2021-07-30 设计创作，主要内容包括：本发明公开了一种循环水养殖的方法,属于水产养殖领域。本发明所述方法通过将海水进行激活及生物膜过滤等处理使水体中的溶氧量及营养物质含量显著提高,同时水体中也带有一定的微磁场；当处理后的水体用于水产养殖时,可使产品具有更高的附加价值及养殖密度；所述水产养殖产出的养殖尾水经过本发明所述方法处理后净化及修复程度高,可再次进行循环利用,减少尾水排放污染。本发明还公开了实施所述循环水养殖方法的系统,所述系统养殖效率高、搭建及维持成本低,耗能较少。(The invention discloses a method for circulating water culture, and belongs to the field of aquaculture. The method of the invention obviously improves the dissolved oxygen and the nutrient content in the water body by activating the seawater, filtering the biological membrane and other treatments, and simultaneously, the water body also has a certain micro magnetic field; when the treated water body is used for aquaculture, the product has higher added value and culture density; the aquaculture tail water produced by aquaculture is high in purification and restoration degree after being treated by the method, can be recycled, and reduces tail water discharge pollution. The invention also discloses a system for implementing the recirculating aquaculture method, which has the advantages of high aquaculture efficiency, low construction and maintenance cost and less energy consumption.)

1. A method for recirculating aquaculture is characterized by comprising the following steps:

(1) carrying out water body activation treatment on seawater after osmosis filtration to obtain super-ionic water A;

(2) putting the super-ionic water A obtained in the step (1) into a seawater fluidization pool for aeration and precipitation treatment, and then performing secondary activation treatment on a water body to obtain super-ionic water B;

(3) after the biological membrane filtration treatment is carried out on the super-ionic water B in the step (2), discharging into a culture pond for aquaculture;

(4) collecting aquaculture tail water generated by aquaculture, sequentially carrying out three-time activation treatment and secondary filtration treatment of biological membranes on the aquaculture tail water to obtain purified sewage C, and repeating the steps (1) to (3) on the purified sewage C for aquaculture.

2. The method of claim 1, wherein the super-ion generator is a pipe-type device connected to a water pipe device, and comprises a water inlet chamber, a gas inlet chamber, a rotary explosion chamber and a water outlet chamber which are connected in sequence.

3. The method for recirculating aquaculture as claimed in claim 2, wherein the water inlet chamber is hollow, and has a water inlet for water inlet and a narrow water gap a at its two ends, respectively, the ratio of the inner diameter of the water inlet to the inner diameter of the narrow water gap is 2-2.5: 1, and the diameter of the water inlet chamber gradually narrows from the middle to the narrow water gap;

the gas inlet chamber is a hollow pipeline which is communicated with the water chamber and the rotary blasting chamber, the gas inlet chamber and the rotary blasting chamber are connected through a narrow water gap b, an inclined gas hole is formed right above the pipeline, the inclination angle of the gas hole is 28-32 degrees, and the ratio of the aperture of the gas hole to the inner diameter of the gas inlet chamber is 1: 4.7-5;

the rotary blasting chamber is a pipeline with a cavity provided with inclined pits, the distribution angle of the inclined pits is 55-65 degrees, the rotary blasting chamber is connected with a water outlet chamber through a wide water gap, the pipe diameter of the rotary blasting chamber is gradually widened from a narrow water gap b to a wide water gap, and the ratio of the inner diameter of the wide water gap to the inner diameter of the narrow water gap b is 2-2.5: 1;

a back pressure device is arranged in the water outlet chamber, and the device is a flow-limiting baffle plate with holes.

4. The method for circulating aquaculture as claimed in claim 1, wherein gas-liquid mixing occurs during the water body activation treatment and the water body secondary activation treatment, and the set flow rate of the super-ion generator during the water body activation treatment and the water body secondary activation treatment is 0.5-1.2 m³The pressure is set to be 0.2-0.5 MPa, the flow rate is 3.3-5.6 m/s, and the gas-liquid flow ratio during gas-liquid mixing is 1: 90-110.

5. The method for recirculating aquaculture as claimed in claim 1, wherein the set flow rate of the super-ion generator for three times of activation of water is 1.3-2 m³The pressure is set to be 0.3-0.8 MPa, the flow rate is 4.2-6.4 m/s, and the gas-liquid flow ratio during gas-liquid mixing is 1: 90-110.

6. The method for recirculating aquaculture as claimed in claim 1, wherein the water inlet speed of the deionized water A in step (2) is 1.8-2.3 m/s and the water inlet pressure is 0.2-0.6 MPa when the deionized water A is placed in the seawater fluidized tank; the water outlet speed of the effluent from the seawater fluidization pool is 1.5-1.8 m/s, and the water outlet pressure is 0.1-0.4 MPa.

7. The method for recirculating aquaculture of claim 1, wherein the flow rate of the influent water during the filtering treatment with the biofilm in step (3) is 1.2-2 m/s, and the pressure of the influent water is 0.4-0.8 MPa; the effluent flow rate is 0.6-1.2 m/s, the effluent pressure is 0.1-0.4 MPa, the biological membrane is removed at regular time, and the removal frequency is 22-26 h/time.

8. The method for recirculating aquaculture of claim 1, wherein the flow rate of inlet water in the secondary filtration treatment of the biofilm in step (4) is 2-2.8 m/s, and the pressure of inlet water is 0.4-0.8 MPa; the flow rate of effluent is 1.2-1.5 m/s, the pressure of effluent is 0.1-0.4 MPa, the biological membrane is removed at regular time, and the removal frequency is 22-26 h/time.

9. The system for circulating water aquaculture is characterized by comprising a graded water treatment and purification system, a circulating water aquaculture system and a aquaculture tail water circulation treatment system which are sequentially connected.

Technical Field

The invention relates to the field of aquaculture, in particular to a method and a system for circulating water culture.

Background

The circulating water culture modes used in the current common aquaculture plants are mainly a pond circulating water culture mode, an RAS circulating water culture mode and an IAA composite pond culture mode, and compared with the traditional natural culture mode, the modes are more environment-friendly, high in yield and lower in implementation cost. The pond circulating water culture mode mainly comprises an alga pond heterotopic restoration circulating water culture mode, a pond internal circulation health culture mode, an artificial wetland composite pond circulating water culture mode and the like, on the basis, a plurality of biological communities are combined for symbiosis, and the developed IAA composite pond culture mode can improve the product diversity. However, in most of the modes, the metabolic behaviors of plants or microorganisms provide nutrition for aquatic products and convert pollutants, and the behaviors are low in efficiency and low in processing speed without good auxiliary degradation measures; the bottom of the implementation ground of the culture mode is basically muddy, and the regulation of water flow and oxygen control is basically not carried out under the mode (if the regulation is carried out, the excessive suspension of the water body is easily caused); in the culture process, a microbial preparation is generally required to be added for in-situ restoration of the water body, however, the preparation needs to form competitive advantages with indigenous microbes and algae in the pond and become dominant species to play a role in purifying water quality, and the conditions are unstable, so that the preparation added in a short period is easy to lose efficacy, and thus, the controllability of the mode is relatively poor.

In contrast, in the RAS circulating water aquaculture mode, metabolites and bait residues of aquaculture objects are quickly removed by means of aeration, sedimentation, microbial degradation, filtration and the like in a relatively closed space, so that water quality is purified to realize recycling, and the method is used for intensive culture of aquatic organisms with high density in a small water body by utilizing running water on the premise of adding a small amount of supplementary water (the recycling rate of the water body is more than 90 percent generally), has high treatment efficiency and is applied to high-value-added aquaculture. However, the mode generally relates to large-scale equipment and structures such as a water inlet system, a sedimentation system, a biological filter and the like, and has large occupied volume and higher construction cost; the filtration system not only consumes high energy, but also needs to add extra chemical consumables to maintain the water quality.

In addition, the oxygen supply mode of the culture mode is mainly a surface aeration mode or a nanotube aeration mode, but due to the insufficient depth of a common culture pond, bubbles in the water body aerated by the aeration methods quickly overflow the water surface, so that the dissolved oxygen of the water body is not high, and the improvement of the productivity and the water body quality is limited.

Disclosure of Invention

Based on the defects of the prior art, the invention aims to provide a method for circulating water aquaculture, which not only provides a more efficient, durable and controllable oxygen supply mode, but also can realize in-situ water body purification and restoration without adding extra chemical reagents, has low implementation cost and can be used for high-addition and high-density aquaculture.

In order to achieve the purpose, the invention adopts the technical scheme that:

a method for recirculating aquaculture comprises the following steps:

(1) carrying out water body activation treatment on seawater after osmosis filtration to obtain super-ionic water A;

(2) putting the super-ionic water A obtained in the step (1) into a seawater fluidization pool for aeration and precipitation treatment, and then performing secondary activation treatment on a water body to obtain super-ionic water B;

(3) after the biological membrane filtration treatment is carried out on the super-ionic water B in the step (2), discharging into a culture pond for aquaculture;

(4) collecting aquaculture tail water generated by aquaculture, sequentially performing three-time activation treatment and secondary filtration treatment of a biological membrane on the aquaculture tail water to obtain purified sewage C, and repeating the steps (1) to (3) on the purified sewage C for aquaculture;

the water body activation treatment, the water body secondary activation treatment and the water body tertiary activation treatment are carried out through a super-ion generator.

The inventor of the application discovers when purifying and researching the water body, because sea water impurity is more, and partial metal ion concentration is high, according to traditional low efficiency and water oxygen content when breeding water and transforming the processing and being difficult to reach standard, and obtain effective activation after the water is through super ionization treatment, the super ionization process of water can make the water flow field produce a large amount of bubbles, the bubble constantly develops in the water flow in-process, the inflation, when the bubble meets obstacle or pressure variation on every side, the bubble will take place to burst to different extents ground, the while splits and forms littleer bubble, release a large amount of energy, and this process leads to the water dissociation and takes place following reaction, produce free radical and ozone:

H₂O→·OH+H·；

·OH+·OH→H₂O₂；

2H·→H₂；

H·+O₂→HO₂·；

2HO₂·→H₂O₂+O₂；

H·+H₂O₂→H₂O+·OH；

H·+H₂O₂→H₂+HO₂·；

·OH+H₂O₂→H₂O+HO₂·；

·OH+H₂→H₂O+H·

in the super-ionization process, when a large number of bubbles collapse, the dissolution of oxygen in the bubbles in water is realized, meanwhile, a certain amount of ozone and strong oxidation free radicals appear in the water body, in addition, under the condition of no external magnetic field, the water body generates a certain magnetic field due to the reaction, and after the activated water body enters a seawater fluidization pool, partial metal ions and large-particle organic impurities generate flocculation adsorption due to the combined action of the magnetic field and the strong oxidation free radicals and finally form sludge precipitation separation water body; meanwhile, because the oxygen content in the water body is obviously improved, the activity of aerobic microorganisms contained in the water body can be improved, and under the action of aeration, the microorganisms can carry out nitration reaction on ammonia nitrogen in the water body and decompose phosphorus-rich organic matters, thereby realizing the nitrogen and phosphorus purification effect of the seawater.

After the water body activation, precipitation and aeration treatment, the aerobic microorganisms in the water body are aggregated to form a biological membrane due to the improvement of biological activity, and the microorganisms can generate transferase with high affinity to metabolites by using various compounds and have higher specific surface area and lower respiration rate, so that the aim of purifying water quality can be further achieved when the formed biological membrane is continuously contacted with the water body. And as the biological membrane is thickened, an anoxic environment is formed in the biological membrane, which is beneficial to the growth of facultative microorganisms, thereby realizing denitrification reaction.

The seawater after the treatment not only reaches the standard of aquaculture, but also obviously improves the dissolved oxygen and the content of nutrient substances (substances after microbial degradation), and can improve the additional quality of the cultured aquaculture; and because the water body is in a flowing circulation state, the method can realize high-density aquaculture.

After the tail water after cultivation is activated again and is filtered by a biological membrane, pollutants such as aquatic manure and the like in the water body can be effectively removed due to a similar mechanism, and meanwhile, the tail water with high oxygen content and a certain magnetic field are attached to the tail water, so that the tail water can still reach the standard of aquaculture after being mixed with the seawater of the next batch, and the recycling rate is high.

Preferably, the super-ion generator is a pipeline type device connected in a water pipeline device, and comprises a water inlet chamber (chamber 1), a gas inlet chamber (chamber 2), a rotary blasting chamber (chamber 3) and a water outlet chamber (chamber 4) which are connected in sequence;

more preferably, the water inlet chamber is hollow, a water inlet for water inlet and a narrow water gap a communicated with the air inlet chamber are respectively arranged at two ends of the water inlet chamber, the ratio of the inner diameter of the water inlet to the inner diameter of the narrow water gap is 2-2.5: 1, and the pipe diameter of the water inlet chamber gradually narrows from the middle part to the narrow water gap.

More preferably, the air inlet chamber is a hollow pipeline which is communicated with the water chamber and the rotary blasting chamber, the air inlet chamber is connected with the rotary blasting chamber through a narrow water gap b, an inclined air hole is formed right above the pipeline, the inclination angle of the air hole is 28-32 degrees, and the ratio of the aperture of the air hole to the inner diameter of the air inlet chamber is 1: 4.7-5.

More preferably, the rotary blasting chamber is a pipeline with a cavity provided with inclined pits, the distribution angle of the inclined pits is 55-65 degrees, the rotary blasting chamber is connected with the water outlet chamber through a wide water gap, the pipe diameter of the rotary blasting chamber gradually increases from the narrow water gap b to the wide water gap, and the ratio of the inner diameter of the wide water gap to the inner diameter of the narrow water gap b is 2-2.5: 1.

More preferably, a back pressure device is arranged in the water outlet chamber, and the back pressure device is a flow limiting baffle plate with holes.

Preferably, gas-liquid mixing occurs during the water body activation treatment and the water body secondary activation treatment, and the set flow rate of the super-ion generator during the water body activation treatment and the water body secondary activation treatment is 0.5-1.2 m³The set pressure is 0.2-0.5 MPa, the flow rate is 3.3-5.6 m/s, and the gas-liquid flow ratio during gas-liquid mixingIs 1: 90-110.

Preferably, the set flow rate of the super-ion generator during three-time activation of the water body is 1.3-2 m³The pressure is set to be 0.3-0.8 MPa, the flow rate is 4.2-6.4 m/s, and the gas-liquid flow ratio during gas-liquid mixing is 1: 90-110.

When seawater enters the super-ion generator at a specific flow and pressure, the seawater enters the water inlet chamber from the water inlet, although the flow velocity is increased due to the narrowing of the pipe diameter, when the seawater flows into the air inlet chamber, a specific amount of air is introduced into the uniquely arranged air holes and is mixed with water to reach a required proportion, and a water flow field generates a large amount of air nuclei and is expanded continuously; then the mixed gas and liquid are rotated and blasted at high speed in the rotary blasting chamber, so that the gas nuclei in the water body are broken and split, the generated strong oxidation groups and ozone can realize the self-disinfection of the water body, and the dissolving amount of oxygen in the water can be increased in the process; the water body can generate high-speed micro jet flow and form a certain weak electric field under the condition of no external magnetic field; when the water body flows into the water outlet chamber, part of the water body flows out from the water outlet, and the other part of the water body flows into the rotary blasting chamber again due to the action of the flow-limiting baffle and continues to react, so that the water body activation efficiency is improved.

Preferably, the water inlet speed of the super-ionic water A in the step (2) when the super-ionic water A is placed in a seawater fluidization pool is 1.8-2.3 m/s, and the water inlet pressure is 0.2-0.6 MPa; the water outlet speed of the effluent from the seawater fluidization pool is 1.5-1.8 m/s, and the water outlet pressure is 0.1-0.4 MPa.

As described above, the activated super-ionic water a contains more ozone and strong oxidation free radicals, and can generate a precipitation reaction after being placed in a fluidized tank, and the activity of microorganisms and organisms in the water body is remarkably improved after aeration, so that the water body reaches the cultivation standard through the biological/microbial reaction, and after the specific water inlet and outlet flow rate and pressure are set, the fluidity and aeration precipitation efficiency of the water body can be maximally considered, meanwhile, the oxygen content imbalance of the super-ionic water due to improper pressure is ensured, and the secondary pollution of the water body due to overlong retention time of the water flow or the insufficient reaction degree of the microorganisms/organisms due to overlong retention time of the water flow are avoided.

Preferably, the flow rate of inlet water during the biological membrane filtration treatment in the step (3) is 1.2-2 m/s, and the pressure of inlet water is 0.4-0.8 MPa; the effluent flow rate is 0.6-1.2 m/s, the effluent pressure is 0.1-0.4 MPa, the biological membrane is removed at regular time, and the removal frequency is 22-26 h/time.

Preferably, the water inflow flow rate during the secondary filtration treatment of the biological membrane in the step (4) is 2-2.8 m/s, and the water inflow pressure is 0.4-0.8 MPa; the flow rate of effluent is 1.2-1.5 m/s, the pressure of effluent is 0.1-0.4 MPa, the biological membrane is removed at regular time, and the removal frequency is 22-26 h/time.

The inventor summarizes in the research of the biological membrane, only under the specific flow rate and pressure of the inlet and outlet water, the microorganisms in the super-ion treated water can form a stable and efficient biological filter membrane, and the biological membrane can fully contact with the water body and the pollutants in the water body and carry out reactions such as nitrification and denitrification only under the flow rate; if the water inlet and outlet flow speed is too fast or the set pressure is too high, the water body cannot fully stay or contact with the biological membrane, and the formation of the biological membrane and the filtration of the water body are not facilitated; and if the water flow velocity is too slow, the water body conversion is not timely, the filtering effect is poor, and meanwhile, the growth of the biological membrane is too fast, so that the secondary pollution of microorganisms to the water body can be caused. Meanwhile, with the increase of the volume and the thickness of the biological membrane, the microbial activity of the biological membrane is limited, so that the biological membrane with high activity can grow again only by clearing the biological membrane in a specific time, and further the high efficiency of the filtration treatment of the biological membrane is kept.

The invention also aims to provide a system for circulating water culture, which comprises a graded water treatment and purification system, a circulating water culture system and a culture tail water circulation treatment system which are sequentially connected.

Preferably, the grading treatment and purification system comprises a primary pump room, a seawater fluidization pool, a secondary pump room, a biological slow filter and a seawater reservoir which are connected in sequence;

more preferably, the primary pump room and the secondary pump room are provided with a super-ion generator, the seawater fluidization tank is provided with a sedimentation tank and an aeration tank, and the slow biological filter is provided with a biological membrane.

Preferably, the breeding tail water circulating treatment system comprises a water collecting well, a sewage collecting tank, a sewage pump room and a biological reaction tank which are connected in sequence;

more preferably, the sewage pump room is provided with a super-ion generator, and the biological reaction tank is provided with a biological membrane.

The system of the invention is corresponding to the circulating water culture method, can realize more efficient, durable and controllable oxygen supply mode, and has better water body purification, culture and circulation effects; the system is lower in building and maintaining cost and energy consumption.

Preferably, still include sludge treatment equipment among the breed tail water circulating system, sludge treatment equipment is including the sludge pump room, sludge impoundment and the sludge dewatering device that connect gradually, the sludge pump room links to each other with the sewage catch basin.

After the sewage in the sewage collecting tank flows out, a certain volume of sludge is remained at the bottom, and the sludge can be effectively applied to the fields of biological compost and the like after being treated by a series of sludge treatment devices, so that the economic benefit of the whole recirculating aquaculture system is higher.

The invention has the beneficial effects that: the invention provides a method for circulating water culture, which obviously improves the dissolved oxygen content and the nutrient content in water by activating seawater, filtering a biological membrane and the like, and meanwhile, the water also has a certain micro magnetic field; when the treated water body is used for aquaculture, the product has higher added value and culture density; the aquaculture tail water produced by aquaculture is high in purification and restoration degree after being treated by the method, can be recycled, and reduces tail water discharge pollution. The invention also provides a system for implementing the method for circulating water culture, and the system has the advantages of high culture efficiency, low construction and maintenance cost and less energy consumption.

Drawings

FIG. 1 is a schematic view of a construction of a super-ionizer according to the present invention; the super-ion generator comprises a water inlet chamber (No. 1 chamber), a gas inlet chamber (No. 2 chamber), a rotary blasting chamber (No. 3 chamber) and a water outlet chamber (No. 4 chamber) which are connected in sequence;

FIG. 2 is a schematic view of the process flow and structure of the system of the method for recirculating aquaculture according to the present invention;

FIG. 3 is a diagram of the fat content analysis of the shrimps cultured by the method of circulating water culture.

Detailed Description

For better illustrating the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to specific examples, which are intended to be understood in detail, but not intended to limit the present invention.

Example 1

The embodiment of the method and the system for circulating water culture is shown in figure 2, and the system comprises a graded water treatment and purification system, a circulating water culture system and a culture tail water circulation treatment system which are sequentially connected:

the grading treatment and purification system comprises a primary pump room, a seawater fluidization pool, a secondary pump room, a biological slow filter and a seawater reservoir which are sequentially connected; the first-stage pump room and the second-stage pump room are provided with a super-ion generator, and the seawater fluidization tank is provided with a sedimentation tank and an aeration tank; the biological slow filter is provided with a biological membrane.

The circulating water culture system comprises a culture pond and a drainage observation control pond connected with the culture pond;

the breeding tail water circulating treatment system comprises a water collecting well, a sewage collecting tank, a sewage pump room and a biological reaction tank which are connected in sequence; the sewage pump room is provided with a super-ion generator, and the biological reaction tank is provided with a biological membrane; still be equipped with sludge treatment equipment among the breed tail water circulation system, sludge equipment is including the sludge pump room, sludge impoundment and the sludge dewatering device that connect gradually, the sludge pump room links to each other with the sewage catch basin.

The method for recirculating aquaculture comprises the following steps:

(1) will be 2000m³Performing osmotic filtration on the seawater, and performing water body activation treatment in a primary pump room to obtain super-ionic water A;

(2) putting the super-ionic water A obtained in the step (1) into a seawater fluidization pool for aeration and precipitation treatment, and then performing secondary activation treatment on a water body in a secondary pump room to obtain super-ionic water B; the water inlet speed of the super-ionic water A when the super-ionic water A is placed in a seawater fluidization pool is set to be 1.8-2.3 m/s, and the water inlet pressure is set to be 0.2-0.6 MPa; the water outlet speed of the effluent seawater from the seawater fluidization pool is set to be 1.5-1.8 m/s, and the water outlet pressure is set to be 0.1-0.4 MPa;

(3) after biological membrane filtration treatment is carried out on the super-ionic water B in the step (2) in a slow biological filter, the super-ionic water B is transferred to a seawater reservoir for temporary standing, and then the super-ionic water B is discharged into a culture pond for aquaculture, and the whole culture parameters are controlled through a drainage observation control pond; the water inflow flow rate during the biological membrane filtration treatment is set to be 1.2-2 m/s, and the water inflow set pressure is 0.4-0.8 MPa; the effluent flow rate is set to be 0.6-1.2 m/s, the effluent pressure is set to be 0.1-0.4 MPa, the biological membrane in the biological slow filter is removed at regular time, and the removal frequency is 24 h/time;

(4) collecting aquaculture tail water generated by aquaculture through a water collecting well and a sewage collecting tank, and sequentially performing three-time activation treatment and biological membrane filtration treatment on a water body in a sewage pump room and a biological reaction tank respectively to obtain purified sewage C, wherein the purified sewage C is used for aquaculture after repeating the steps (1) - (3); the water inflow flow rate during the secondary filtration treatment of the biological membrane is set to be 2-2.8 m/s, and the water inflow pressure is set to be 0.4-0.8 MPa; the set flow rate of effluent is 1.2-1.5 m/s, the pressure of effluent is 0.1-0.4 MPa, the biological membrane in the biological slow filter is removed at regular time, and the removal frequency is 24 h/time; after sludge produced by sewage is pressurized by a sludge pump room and precipitated in a sludge tank, the sludge is dehydrated by a dehydration device in a sludge dehydration machine room, and finally the treated sludge is transported to other applications such as compost and the like.

The structure of the super-ion generator is shown in figure 1, the main structure of the super-ion generator is a pipeline type device connected in water pipeline equipment, and the super-ion generator comprises a water inlet chamber (No. 1 chamber), a gas inlet chamber (No. 2 chamber), a rotary blasting chamber (No. 3 chamber) and a water outlet chamber (No. 4 chamber) which are sequentially connected; the water inlet chamber is hollow, the overall length of the water inlet chamber is 400cm, a water inlet for water to enter and a narrow water gap a communicated with the air inlet chamber are respectively arranged at two ends of the water inlet chamber, the inner diameter of the water inlet is 72cm, the inner diameter of the narrow water gap is 32cm, and the pipe diameter of the water inlet chamber is gradually narrowed from the middle part to the narrow water gap;

the gas inlet chamber is a hollow pipeline which is communicated with the water chamber and the rotary blasting chamber, the length of the gas inlet chamber is 200cm, the gas inlet chamber is connected with the rotary blasting chamber through a narrow water gap b, an inclined vent hole is formed right above the pipeline, the inclination angle of the vent hole is 30 degrees, and the aperture of the vent hole is 6.5 cm;

the rotary blasting chamber is a pipeline with a cavity fully distributed with inclined pits, the length of the rotary blasting chamber is 200cm, the distribution angle of the inclined pits is 60 degrees, the rotary blasting chamber is connected with a water outlet chamber through a wide water gap, the pipe diameter of the rotary blasting chamber is gradually widened from a narrow water gap b to the direction of the wide water gap, and the inner diameter of the wide water gap is 72 cm;

a back pressure device is arranged in the water outlet chamber, the device is a flow-limiting baffle plate with a hole, the water outlet chamber is also a pipeline communicated with the middle, and the length of the water outlet chamber is 200 cm;

the set flow rate of the super-ion generator during water body activation treatment and water body secondary activation treatment is 0.5-1.2 m³The set pressure is 0.2-0.5 MPa, the flow rate is 3.3-5.6 m/s, and the gas-liquid flow ratio during gas-liquid mixing is 1:100

The set flow rate of the water body in the super-ion generator during three-time activation treatment is 1.3-2 m³The set pressure is 0.3-0.8 MPa, the flow rate is 4.2-6.4 m/s, and the gas-liquid flow ratio during gas-liquid mixing is 1: 100.

The culture pond is provided with a plurality of small ponds, prawns are cultured in each small pond, and the culture density of the prawns is 16 jin/m³After 105 days of cultivation, the prawns in two non-adjacent small ponds are sampled and weighed, if 40 prawns/jin are reached (if the prawns are not reached, the prawns are continuously cultivated for multiple days until the measuring standard is reached), the prawns are respectively marked as SW01 and SW04 prawn samples, meanwhile, the prawns with homologous juvenile prawns cultivated in the local prawn cultivation field and the cultivation base of the system and close to the same period are respectively marked as SW02 and SW03 prawn samples, the prawn samples are respectively sent to a third-party detection mechanism for in-vivo detection, the detection items mainly comprise the fat content and the mineral content of the prawns, and the test results are shown in figure 3 and table 1.

TABLE 1

As can be seen from Table 1 and FIG. 3, the fat content of the aquatic prawns produced by the method and system for circulating water aquaculture is lower than that of the aquatic prawns produced by other aquaculture methods, the element content of each pair of prawn products is equivalent, the aquaculture method and system disclosed by the invention do not have element enrichment phenomenon, and can effectively replace the traditional aquaculture mode, wherein the calcium element content of the SW01 prawn is far higher than that of other samples, and the selenium element content of the SW04 element is highest, which indicates that the beneficial element content of the prawn products cultured by the method disclosed by the invention is relatively higher, and the additional business value is high.

In addition, in order to verify the magnetic field generation effect of the super-ionic water generator on the water body, for the water body in the circular culture pond with the diameter of 7.14m and the depth of 1.2m in the embodiment, the electromagnetic values of the water body at the bottom (0.2m), the middle (0.6m) and the shallow water layer (1m) are detected after the water body flows into the circular culture pond, and meanwhile, a blank seawater water body which is not treated by the super-ionic water generator is placed in an idle reservoir with the same size and subjected to the same test; after the water body flows into the culture pond for 1 hour, the same test is carried out again, and the electromagnetic value is recorded, and the result is shown in table 2.

TABLE 2

Detection site	Cultivation of fishPool water body	Water body of reservoir	1h later culture pond water body	Reservoir water body after 1h
					Bottom part	0.185mG	0.098mG	0.162mG	0.095mG
Middle part	0.126mG	0.092mG	0.117mG	0.092mG
					Superficial layer	0.108mG	0.095mG	0.099mG	0.092mG

From table 2, it can be seen that the electromagnetic values of the water body at various depths after being treated by the super-ion water generator are significantly increased, and the electromagnetic values of the water body after being placed for 1h are still higher than those of the blank control water body, which shows that the water body activation treatment of the present invention can endow the water body with a certain micro-electric field under the condition of no external magnetic field and the effect has persistence, so that the electrical conductivity, osmotic pressure, surface tension, dissolved oxygen, pH value, chemical shift and optical performance of water molecules are all changed, thereby producing a series of beneficial biological effects.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.