Source water treatment system applied to recirculating aquaculture mode of penaeus vannamei boone

Abstract

The utility model discloses a source water treatment system applied to a recirculating aquaculture mode of penaeus vannamei boone, which comprises a source water storage unit, a source water primary disinfection unit, a source water primary filtering unit, a source water secondary filtering unit and an aquaculture purified water temporary storage unit, the source water storage unit, the source water treatment and disinfection unit, the source water primary filtering unit, the source water secondary filtering unit and the culture purified water temporary storage unit are sequentially connected, an ozone disinfection device is arranged between the source water secondary filtering unit and the culture purified water temporary storage unit, and a water outlet of the culture purified water temporary storage unit is connected with a circulating water culture system. And an ozone residue monitoring device is arranged in the culture purified water temporary storage unit. Particulate matters in a water body are finely filtered, the TSS level of source water is remarkably reduced, bacteria and viruses in the water body are efficiently removed, the culture safety is remarkably improved, the requirement for culture water consumption is met, and the risk of culture water consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial aquaculture, in particular to a source water treatment system applied to the circulating water aquaculture mode of Litopenaeus vannamei. Background Art

[0002] As an important economic species in aquaculture, Litopenaeus vannamei has the advantages of short growth cycle, strong environmental adaptability, high nutritional content, etc. However, with the continuous increase of domestic aquaculture scale and stocking density, the tail water containing a large amount of organic waste in the traditional aquaculture mode is directly discharged into the external environment, which is extremely easy to cause water eutrophication and the breeding of bacterial pathogens. It becomes particularly difficult to take water for the second time, resulting in frequent diseases in the aquaculture process and unsustainable aquaculture activities. Taking the Bohai Sea as an example, as a semi-enclosed sea area, its water exchange capacity is weak. The pollutants carried by the large amount of aquaculture tail water discharged along the Bohai Bay are not easy to diffuse and dilute, and the pathogen content is easy to accumulate. Among them, microsporidia, Vibrio parahaemolyticus and Vibrio harveyi, white spot virus, infectious myonecrosis virus, etc. Without effective prevention and control measures, it will seriously affect the aquaculture success rate of Litopenaeus vannamei in the Bohai Bay waters.

[0003] In recent years, in order to promote the transformation of China's aquaculture industry to green and high-quality development, the government encourages innovative aquaculture models and establishes and improves the mechanism for recycling aquaculture resources and pollution control. The recirculating aquaculture system can achieve high output per unit water body far exceeding the stocking density of the traditional aquaculture mode, and the water demand is reduced by 90-99% compared with the traditional mode. At the same time, due to the airtightness of its aquaculture space, it can effectively maintain the stability of the aquaculture environment and minimize the use of chemical agents, aiming to achieve the efficient, green and sustainable comprehensive utilization of natural resources.

[0004] However, as a modern intensive aquaculture mode, the design of the recirculating water system is more complex and delicate. A single recirculating aquaculture system often has multiple functional units, and facilities such as water pipelines and lift pumps are used to connect the multiple functional units to each other, so that the aquaculture water can circulate, and the stability of the water environment is jointly maintained through the coordinated operation of various functional devices to meet the rapid growth needs of aquaculture organisms. However, once the system is invaded by pathogenic microorganisms, the complex pipeline design often has many cleaning dead corners, and the strong oxidizing and corrosive properties of most disinfectants will cause irreversible damage to the equipment, which greatly increases the disinfection and killing difficulty of the system. Past experience shows that the disinfection and killing cycle of the recirculating water system often lasts for several months or even more than a year. As a capital-intensive aquaculture facility, it will undoubtedly put great pressure on the operating cost.

[0005] The sources of bacteria and viruses in a closed recirculating aquaculture system often involve four aspects: "water, seeds, bait, and people". Among them, the seeds and bait can be tested and screened for relevant pathogens before procurement to reduce risks. Aquaculture personnel can also prevent external input of pathogens through refined management and the use of professional disinfection rooms. In addition to the above, the source water for aquaculture, as the only possible pathogen transmission route, is particularly important and is a prerequisite for the continuous and stable operation of the recirculating water system. Summary of the Invention

[0006] The present utility model aims to provide a source water treatment system applied to the recirculating aquaculture mode of Litopenaeus vannamei, covering aspects such as the removal of waterborne particulate matter, physical filtration and chemical killing of bacteria and pathogens, etc., to ensure the efficient and refined treatment of source water, reduce aquaculture risks, and significantly improve aquaculture safety and success rate.

[0007] In order to achieve the above invention objectives, the technical solution of the present utility model is as follows:

[0008] A source water treatment system applied to the recirculating aquaculture mode of Litopenaeus vannamei includes a source water storage unit, a primary source water disinfection unit, a primary source water filtration unit, a secondary source water filtration unit, and a cultured purified water temporary storage unit. The water inlet of the source water storage unit is connected to external seawater. The source water storage unit, the source water treatment and disinfection unit, the primary source water filtration unit, the secondary source water filtration unit, and the cultured purified water temporary storage unit are connected in sequence. An ozone disinfection device is provided between the secondary source water filtration unit and the cultured purified water temporary storage unit. The water outlet of the cultured purified water temporary storage unit is connected to the recirculating aquaculture system, and an ozone residue monitoring device is provided inside the cultured purified water temporary storage unit.

[0009] The source water storage unit is a water storage pond, and the capacity of the water storage pond is 10 - 15% of the daily average water replacement volume of the recirculating water system within a single batch aquaculture cycle.

[0010] The primary source water disinfection unit is a disinfection pond, and the disinfection pond is provided with a chlorine-containing disinfectant adding device and a water stirring device.

[0011] The primary source water filtration unit is a valve-less sand filter tank, and the valve-less sand filter tank includes a tank body, and the tank body is filled with homogeneous quartz sand of equal particle size as the filter layer.

[0012] The secondary source water filtration unit is an ultrafiltration device, including a pre-filtering laminated filter and an ultrafiltration machine connected in sequence. The filtration accuracy of the pre-filtering laminated filter is 200 μm, the filtration medium of the ultrafiltration machine is ultrafiltration membrane filaments, and the average pore size of the ultrafiltration machine is less than or equal to 30 nm.

[0013] The ozone disinfection device includes an ozone generator and a jet pump. A circulation pipeline II is provided on the connection pipeline I between the source water secondary filtration unit and the aquaculture purified water temporary storage unit. A jet pump is provided on the circulation pipeline II, and the circulation pipeline II at the outlet end of the jet pump is connected to the ozone generator.

[0014] The ozone generator is connected to the circulation pipeline through a Venturi tube.

[0015] The aquaculture purified water temporary storage unit is connected to the inlet end of the jet pump through pipeline III. A valve I is provided at the outlet of the source water secondary filtration unit on the connection pipeline I. A valve II is provided at the inlet end of the jet pump on the circulation pipeline II. A valve III is provided on the pipeline III.

[0016] The aquaculture purified water temporary storage unit is a distribution pond, and multiple distribution ponds are provided.

[0017] The beneficial effects of the present utility model are as follows:

[0018] 1. The present utility model finely filters water body particles, significantly reducing the TSS level of the source water. The removal of total suspended solids (TSS) in the water body is the primary goal of the recirculating aquaculture system. Its long-term accumulation and retention will increase the oxygen consumption of the system, decompose to produce toxic compounds such as ammonia nitrogen, block the gill organs of aquatic animals, and at the same time increase the working load of core functional equipment such as microfiltration machines and biological filters. The reasonable range of TSS for most economically cultured aquatic species is 10 - 80 mg / L. Removing water body particles at the source water treatment end is beneficial to maintaining the long-term stable operation of the recirculating water system. Through a multi-stage physical filtration system and by combining ozone to strongly oxidize small particle suspensions in the water body, the TSS level of the source water ≤ 1 mg / L.

[0019] 2. The present utility model efficiently removes bacteria and viruses in the water body, significantly improving aquaculture safety. The spread of bacterial and viral diseases is a major factor severely restricting the development of intensive aquaculture of Litopenaeus vannamei, and the source water supply system is the main way for external pathogens to invade. Based on the traditional self-sedimentation of source water particles and chlorination disinfection, this patent adds multi-stage fine filtration and combines it with the strong oxidation disinfection of ozone. Pathogens and bacteria with larger diameters can be filtered out and removed through a microporous ultrafiltration membrane (average pore diameter ≤ 30 nm). For some small-sized viruses that may escape (such as Taura syndrome virus 31 - 32 nm, hepatopancreatic parvovirus 22 - 24 nm, muscle necrosis virus about 40 nm), they are removed by adding ozone at the back end. The overall bacterial removal efficiency of the system ≥ 98%, and the virus removal rate reaches 100%. It can completely block the pathogen transmission route of the source water, significantly improve aquaculture safety and success rate, and ensure the stable output of the system.

[0020] 3. The utility model meets the demand for aquaculture water consumption and reduces the risk of aquaculture water use. The system can achieve that the single water intake meets the aquaculture water demand within one cycle, greatly reducing the aquaculture water use risk caused by severe changes in the natural environment and ensuring the aquaculture success rate.

[0021] 4. In the utility model, by setting an ozone residue monitoring device in the aquaculture purified water storage unit, the ozone residue amount in the water body after ozone disinfection is monitored in real time, avoiding excessive ozone concentration from eroding the trachea and gills of shrimp larvae, resulting in dyspnea and asphyxiation death. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the source water treatment system applied to the recirculating aquaculture mode of Litopenaeus vannamei of the present utility model.

[0023] Figure 2 It is a schematic structural diagram of the ozone disinfection device of the present utility model.

[0024] Among them, 1. Source water storage unit; 2. Primary source water disinfection unit; 3. Primary source water filtration unit; 4. Secondary source water filtration unit; 5. Aquaculture purified water storage unit; 6. Ozone disinfection device; 7. Valve I; 8. Valve II; 9. Valve III; 10. Venturi tube; 11. Ozone residue monitoring device; 12. Ozone generator; 13. Jet pump. Specific Embodiments

[0025] The following further describes the present utility model in detail with reference to the embodiments, but the embodiments of the present utility model are not limited thereto.

[0026] Embodiment 1

[0027] As Figure 1 shown, this embodiment provides a source water treatment system applied to the recirculating aquaculture mode of Litopenaeus vannamei, including a source water storage unit 1, a primary source water disinfection unit 2, a primary source water filtration unit 3, a secondary source water filtration unit 4, and an aquaculture purified water storage unit 5. The water inlet of the source water storage unit 1 is connected to the external seawater. The source water storage unit 1, the source water treatment and disinfection unit, the primary source water filtration unit 3, the secondary source water filtration unit 4, and the aquaculture purified water storage unit 5 are connected in sequence. An ozone disinfection device 6 is arranged between the secondary source water filtration unit 4 and the aquaculture purified water storage unit 5. The water outlet of the aquaculture purified water storage unit 5 is connected to the recirculating aquaculture system. An ozone residue monitoring device 11 is arranged in the aquaculture purified water storage unit 5.

[0028] In this embodiment, the source water treatment applied to the recirculating aquaculture mode of Litopenaeus vannamei is completed through the following steps:

[0029] 1) Before each batch of aquaculture, the water required for this batch is pumped into the source water storage unit 1 at one time by the external water and allowed to stand and precipitate for more than 15 days; when the source water storage unit 1 is storing water, the spring tide period should be selected according to the seawater tide law, and the tide head and tide tail should be avoided, and the water should be inlet during the high tide period; after the precipitation is completed, the surface water body of the source water storage unit 1 is pumped into the primary source water disinfection unit 2, and the water body below 11 m in the source water storage unit 1 cannot be used;

[0030] 2) After formulating the water inlet plan for the aquaculture system, use chlorine-containing disinfectant to disinfect the water body in the primary source water disinfection unit 2; formulate the effective chlorine concentration according to the initial bacteria and virus content of the water body in different seasons, and then calculate the dosage of the disinfectant; the specific usage standards are shown in Table 1:

[0031] Table 1 Effective chlorine control strategy and disinfectant dosage in the disinfection pool in different months

[0032]

[0033] After adding, after 3 - 4 days, when the residual chlorine detection ≤ 1 ppm, the water body can be pumped into the next treatment unit. To avoid secondary pollution caused by environmental and other external factors, the water body in a single pool needs to be used up within 7 days after disinfection is completed;

[0034] 3) After the water body passes through the primary source water disinfection unit 2, it is pumped into the primary source water filtration unit 3 to filter and remove large particulate impurities, and then enters the secondary source water filtration unit 4 to intercept and remove small particulate substances and perform refined filtration of bacteria and viruses;

[0035] 4) After the water body is filtered by the secondary source water filtration unit 4, ozone is added through the ozone disinfection device 6 for disinfection and sterilization;

[0036] 5) The water body after adding ozone enters the distribution pool and stands for more than 40 minutes to dissipate the residual ozone. When the ozone residual monitoring device 11 shows that the residual ozone in the water body ≤ 0.01 mg / L, it is considered that the disinfection and sterilization are completed, and the water body in this pool can be used for aquaculture in the circulating water system.

[0037] In this embodiment, the pathogenic concentration table at different sites of the source water treatment system is shown in Table 2, the bacterial concentration table at different sites of the source water treatment system is shown in Table 3, and the killing efficiency of ozone on water body bacteria and viruses is shown in Table 4.

[0038] Table 2 Pathogenic concentration table at different sites of the source water treatment system

[0039]

[0040] Table 3 Bacterial concentration table at different sites of the source water treatment system

[0041]

[0042] Table 4 Bactericidal and Virucidal Efficiency of Ozone on Water Bacteria and Viruses

[0043]

[0044] As can be seen from Table 2-4, the source water treatment system applied to the recirculating aquaculture mode of Litopenaeus vannamei in this embodiment has remarkable treatment effects on viruses and bacteria. By setting up the primary source water disinfection unit 2, the primary source water filtration unit 3, the secondary source water filtration unit 4 and the ozone disinfection device 6, the source water is subjected to multi-stage filtration and disinfection, the water body particles are refinedly filtered, and the water body bacteria and viruses are efficiently removed, significantly improving the aquaculture safety.

[0045] Example 2

[0046] Compared with Example 1, the difference in this example is that in this example, the source water storage unit 1 is a storage pond, and the capacity of the storage pond is 10-15% of the daily average water replacement volume of the recirculating water system within a single batch aquaculture cycle. The rest of the structure is the same as that of Example 1.

[0047] In this example, in order to reduce the aquaculture risk, the water body capacity of the reservoir should be designed with reference to 10-15% of the daily average water replacement volume of the recirculating water system within a single batch aquaculture cycle to ensure that its capacity can meet the water demand for a single batch aquaculture of the factory area recirculating water system.

[0048] Example 3

[0049] Compared with Example 1, the difference in this example is that in this example, the primary source water disinfection unit 2 is a disinfection pond, and the disinfection pond is provided with a chlorine-containing disinfectant adding device and a water stirring device. In this example, the water stirring device adopts a surface waterwheel type aerator. The rest of the structure is the same as that of Example 1.

[0050] In this example, after the water body is pumped into the disinfection pond, a chlorine-containing disinfectant is added to the disinfection pond through the chlorine-containing disinfectant adding device. When adding the disinfectant, the surface waterwheel type aerator can be turned on to accelerate the mixing of the medicine, and to accelerate the dissipation of the residual chlorine in the water body after disinfection is completed.

[0051] Example 4

[0052] Compared with Example 1, the difference in this example is that in this example, the primary source water filtration unit 3 is a valve-less sand filter tank, and the valve-less sand filter tank includes a tank body, and the tank body is filled with homogeneous quartz sand of equal particle size as a filter layer. The rest of the structure is the same as that of Example 1.

[0053] In this example, the three-dimensional deep filtration of the source water is realized by using homogeneous quartz sand of equal particle size as the filter layer, removing large particle suspended matters and some organic substances in the water body, and having the advantages of small filtration resistance, large specific surface area, strong corrosion resistance and good anti-pollution performance.

[0054] Example 5

[0055] Compared with Example 1, the difference between this embodiment and Example 1 is that, in this embodiment, the source water secondary filtration unit 4 is an ultrafiltration device, including a pre-laminated filter and an ultrafilter connected in sequence, the filtration accuracy of the pre-laminated filter is 200 μm, the filtration medium of the ultrafilter is an ultrafiltration membrane, and the average pore size of the ultrafilter is less than or equal to 30 nm. The rest of the structure is the same as that of Example 1.

[0056] In this embodiment, the water particles are further removed by the front stacked filter to avoid perforation of the ultrafiltration membrane, and the backwash process is performed alternately to ensure continuous water output; the ultrafiltration machine relies on ultrafiltration membrane filaments as the filtration medium, with an average pore size of ≤30 nm, which can intercept suspended matter, colloids, proteins, bacteria and viruses and other macromolecular substances in the water, thereby achieving the purpose of water purification.

[0057] Example 6

[0058] like Figure 2 As shown, the present embodiment is different from the embodiment 1 in that, in the present embodiment, the ozone disinfection device 6 includes an ozone generator 12 and a jet pump 13, a circulation pipeline II is provided on the connecting pipeline I between the source water secondary filtration unit 4 and the aquaculture clean water temporary storage unit 5, a jet pump 13 is provided on the circulation pipeline II, and the circulation pipeline II at the outlet end of the jet pump 13 is connected to the ozone generator 12; the ozone generator 12 is connected to the circulation pipeline through a venturi tube 10; the aquaculture clean water temporary storage unit 5 is connected to the inlet end of the jet pump 13 through a pipeline III, a valve I7 is provided at the outlet of the source water secondary filtration unit 4, a valve II8 is provided at the inlet end of the jet pump 13 of the circulation pipeline II, and a valve III9 is ​​provided on the pipeline III, and the remaining structure is the same as that of the embodiment 1.

[0059] In this embodiment, valve I7, valve II8 and valve III9 are all ball valves. In this embodiment, the addition of ozone to the rear end of the ultrafiltration effluent and the addition of ozone to the self-circulating water distribution tank can be realized by opening and closing valves I7, valve II8 and valve III9;

[0060] Ozone addition at the rear end of ultrafiltration effluent: open ball valves I and II, close ball valve III, and allow part of the ultrafiltration effluent to fully blend with ozone through the venturi tube 10 after the jet pump 13, and then flow into the main pipeline again, so that the instantaneous ozone concentration of the unit water body is increased to ≥2 mg / L;

[0061] Self-circulating ozone addition in the water distribution tank: When the water distribution tank is full, to avoid the risk of secondary pollution caused by environmental and personnel operation factors that may occur during long-term temporary storage, open ball valve III, close ball valve I and ball valve II. The jet pump 13 draws water from the bottom pipeline of the water distribution tank and mixes it with ozone, and then returns to the water distribution tank again to construct a self-circulating disinfection system for the water distribution tank - ozone.

[0062] Embodiment 7

[0063] Compared with Embodiment 1, the difference in this embodiment is that in this embodiment, the aquaculture purified water temporary storage unit 5 is a water distribution tank, and multiple water distribution tanks are provided. The rest of the structure is the same as that of Embodiment 1.

[0064] In this embodiment, the water after secondary filtration of the raw water flows into the water distribution tank after being disinfected by ozone. The residual ozone dissipates by itself through water body static settlement. Single or multiple circulating water systems can be rotated and used in combination with multiple independent water distribution tanks according to the daily water change requirements.

[0065] It can be understood that the present utility model is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present utility model, various changes or equivalent replacements can be made to these features and embodiments. Additionally, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. A source water treatment system applied to the recirculating water culture mode of Penaeus vannamei, characterized by: The invention comprises a source water storage unit (1), a source water primary disinfection unit (2), a source water primary filtration unit (3), a source water secondary filtration unit (4) and an aquaculture clean water temporary storage unit (5) which are connected in sequence, wherein the water inlet of the source water storage unit (1) is connected to external seawater, an ozone disinfection device (6) is arranged between the source water secondary filtration unit (4) and the aquaculture clean water temporary storage unit (5), the water outlet of the aquaculture clean water temporary storage unit (5) is connected to a circulating water aquaculture system, and an ozone residual monitoring device (11) is arranged in the aquaculture clean water temporary storage unit (5).

2. The source water treatment system for the circulating water culture mode of Penaeus vannamei according to claim 1 is characterized in that: The source water storage unit (1) is a water storage pond, and the capacity of the water storage pond is 10-15% of the average daily water exchange volume of the circulating water system in a single batch breeding cycle.

3. The source water treatment system for the circulating water culture mode of Penaeus vannamei according to claim 1 is characterized in that: The source water primary disinfection unit (2) is a disinfection pond, and the disinfection pond is provided with a chlorine-containing disinfectant adding device and a water stirring device.

4. The source water treatment system for the circulating water culture mode of Penaeus vannamei according to claim 1 is characterized in that: The source water primary filtration unit (3) is a valveless sand filter tank, which comprises a tank body filled with homogeneous quartz sand of equal particle size as a filter material layer.

5. The source water treatment system for the recirculating aquaculture mode of Penaeus vannamei according to claim 1 is characterized in that: The source water secondary filtration unit (4) is an ultrafiltration device, comprising a pre-laminated filter and an ultrafilter connected in sequence, the filtration accuracy of the pre-laminated filter is 200 μm, the filtration medium of the ultrafilter is an ultrafiltration membrane, and the average pore size of the ultrafilter is less than or equal to 30 nm.

6. The source water treatment system for the circulating water culture mode of Penaeus vannamei according to claim 1 is characterized in that: The ozone disinfection device (6) comprises an ozone generator (12) and a jet pump (13); a circulation pipeline II is provided on the connecting pipeline I between the source water secondary filtration unit (4) and the aquaculture water purification temporary storage unit (5); the jet pump (13) is provided on the circulation pipeline II; and the circulation pipeline II at the outlet end of the jet pump (13) is connected to the ozone generator (12).

7. The source water treatment system for the circulating water culture mode of Penaeus vannamei according to claim 6 is characterized in that: The ozone generator (12) is connected to the circulation pipeline II via a venturi tube (10).

8. The source water treatment system for the circulating water culture mode of Penaeus vannamei according to claim 6 is characterized in that: The aquaculture water temporary storage unit (5) is connected to the inlet end of the jet pump (13) through a pipeline III, the connecting pipeline I is provided with a valve I (7) at the outlet of the source water secondary filtration unit (4), the circulation pipeline II is provided with a valve II (8) at the inlet end of the jet pump (13), and the pipeline III is provided with a valve III (9).

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