Device for treating aquaculture tail water by magnetic field coupling membrane

Abstract

The invention discloses a device for treating aquaculture tail water through a magnetic field coupling membrane, and belongs to the technical field of industrial recirculating aquaculture. The device comprises a culture pond, a conveying pipeline, at least one separation assembly and at least one reaction assembly, and the reaction assembly is connected with the culture pond through the conveying pipeline; the separation assembly is mounted in the reaction assembly. The ion exchange membrane is coated outside the stock solution chamber of the separation assembly, and the stock solution chamber is mounted in the magnetic field space generated by the magnet, so that ammonium ions and phosphate ions in the tail water are effectively removed under the action of the magnetic field and the selective permeability of the membrane. Meanwhile, the stock solution chamber is immersed in the ionic reaction liquid in the reaction assembly, and ammonium ions and phosphate ions penetrating out of the stock solution chamber can directly react with the ionic reaction liquid. The design of the device is suitable for continuous flow treatment, ammonia nitrogen and phosphate in tail water can be removed in real time, and pollutant accumulation of target aquaculture water is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of industrialized circulating aquaculture, and in particular to a device for treating aquaculture tail water by using a magnetic field coupled membrane. Background Art

[0002] Industrial aquaculture produces a large amount of tailwater, and the removal of ammonia nitrogen and phosphate is an important part of tailwater treatment. Existing methods for removing ammonia nitrogen and phosphate mainly include chemical precipitation, biological treatment and electrochemical methods. Among them, the biological treatment method has strict reaction conditions and low phosphate treatment efficiency, while the electrochemical method has high operating costs and often has membrane fouling problems.

[0003] Therefore, it is very necessary to develop a water treatment device that is clean, efficient, easy to operate and can separate ammonia nitrogen and phosphate in real time. Summary of the invention

[0004] The present invention aims to overcome the problem of low efficiency of removing ammonia nitrogen and phosphate in aquaculture tail water in the prior art, and provides a device for treating aquaculture tail water by using a magnetic field coupled membrane.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is: a device for treating aquaculture tail water by using a magnetic field coupled membrane is provided, the device comprising a breeding pond, a delivery pipeline, at least one separation component and at least one reaction component, the reaction component is connected to the breeding pond through the delivery pipeline, and the separation component is installed in the reaction component; the separation component comprises at least two magnets, a stock liquid chamber and an ion exchange membrane, the two ends of the stock liquid chamber are connected to the delivery pipe, the ion exchange membrane is wrapped outside the stock liquid chamber, and the magnets are fixed on both sides of the stock liquid chamber.

[0006] In one embodiment, the raw liquid chamber comprises a pipeline, at least one through hole is formed on the pipeline, and the through hole is covered with the ion exchange membrane.

[0007] In one embodiment, the magnets are mounted on opposite inner walls of the reaction component, and the two magnets have opposite poles and are parallel to each other, generating a magnetic field space between the magnets.

[0008] In one embodiment, the reaction assembly includes an anion reaction chamber and a cation reaction chamber, and both the anion reaction chamber and the cation reaction chamber are connected to the culture pond through the transport pipeline.

[0009] In one embodiment, the anion reaction chamber is filled with anion reaction liquid, and the stock solution chamber wrapped with the anion exchange membrane is immersed in the anion reaction liquid and is arranged in the magnetic field space.

[0010] In one embodiment, the cation reaction chamber is filled with a cation reaction solution, and the stock solution chamber wrapped with the cation exchange membrane is immersed in the cation reaction solution and is arranged in the magnetic field space.

[0011] In one embodiment, the anion reaction solution is selected from lanthanum chloride solution.

[0012] In one embodiment, the cationic reaction solution is selected from a sodium hydroxide solution, and the pH of the cationic reaction solution is greater than 10.

[0013] In one embodiment, a water pump is provided at the water inlet of the delivery pipeline to provide power for the tail water in the breeding pond to enter the separation component.

[0014] In one embodiment, the water outlet of the delivery pipeline is connected to the breeding pond.

[0015] The present invention coats an ion exchange membrane outside the stock liquid chamber of the separation component, and installs the stock liquid chamber in the magnetic field space generated by the magnet, and utilizes the magnetic field and the selective permeability of the membrane to effectively remove the ammonium ions and phosphate ions in the tail water. At the same time, the stock liquid chamber is immersed in the ion reaction liquid in the reaction component, and the ammonium ions and phosphate ions that penetrate from the stock liquid chamber can directly react with the ion reaction liquid. The design of the device is suitable for continuous flow treatment, and can remove ammonia nitrogen and phosphate in the tail water in real time to avoid the accumulation of pollutants in the target aquaculture water body. At the same time, the device has the advantages of low energy consumption and compact structure. It adopts a modular design concept, which can not only realize flexible adjustment, but also facilitate subsequent installation and maintenance work, and can effectively meet the needs of multiple scenarios.

[0016] In order to make the above features and advantages of the invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a device for treating aquaculture tail water using a magnetic field coupled membrane in the present invention.

[0018] Figure 2 for Figure 1 Top view of the device.

[0019] Figure 3 It is an assembly diagram of the pipeline and ion exchange membrane in the present invention.

[0020] Figure 4 It is a working principle diagram of the present invention.

[0021] Breeding pond - 1;

[0022] Delivery pipeline-2; water inlet-21; water outlet-22;

[0023] Separation component-3; magnet-31; raw liquid chamber-32; ion exchange membrane-33; pipeline-321; through hole-322;

[0024] Reaction component-4; anion reaction chamber-41; cation reaction chamber-42; anion reaction solution-43; cation reaction solution-44;

[0025] Water pumps - 5. DETAILED DESCRIPTION

[0026] In order to make the purpose and technical solution of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0028] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention. Although the illustrations only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation, the type, quantity and proportion of each component in actual implementation may be changed arbitrarily, and the component layout type may also be more complicated.

[0029] Figure 1 Schematic diagram of the device for treating aquaculture tail water by using magnetic field coupled membrane in the present invention. Figure 1 As shown, the device for treating aquaculture tail water with a magnetic field coupled membrane relies on a magnetic field to drive the charged ammonium ions and phosphate ions to move in a directional manner. The ammonium ions and phosphate ions selectively pass through the corresponding anion and cation exchange membranes to react with the anion and cation reaction liquid to achieve the directional removal of ammonia nitrogen and phosphate.

[0030] The device comprises a culture pond 1, a delivery pipeline 2, at least one separation component 3 and at least one reaction component 4, wherein the reaction component 4 is connected to the culture pond 1 through the delivery pipeline 2, and the separation component 3 is installed in the reaction component 4. A water pump 5 is arranged at the water inlet 21 of the delivery pipeline 2, and the water pump 5 is used to pump the tail water generated in the culture pond 1 into the separation component 3. The separation component 3 is used to separate the ammonium ions and phosphate ions in the tail water, and the ammonium ions and phosphate ions enter the reaction component 4 to react and remove the ammonia nitrogen and phosphate in the tail water. At the same time, the water outlet 22 of the delivery pipeline 2 is connected to the culture pond 1, and the tail water after nitrogen and phosphorus removal is discharged back into the culture pond 1 through the water outlet 22 at the tail end of the delivery pipeline 2, so as to achieve the effect of wastewater reuse.

[0031] like Figure 2 As shown, the separation component 3 includes at least two magnets 31, a stock liquid chamber 32 and an ion exchange membrane 33. The two ends of the stock liquid chamber 32 are connected to the delivery pipeline 2. The ion exchange membrane 33 is wrapped around the outside of the stock liquid chamber 32. The magnets 31 are fixed on both sides of the stock liquid chamber 32. Figure 3 It can be seen that the original liquid chamber 32 includes a pipe 321, and at least one through hole 322 is provided on the pipe 321. The through hole 322 is covered with an anion exchange membrane or a cation exchange membrane for passing the corresponding anions or cations. The pipe 321 is made of acid and alkali resistant material, and a polyfluoride tube can be used. The ion exchange membrane 33 can be a DuPont 117 membrane. The magnet 31 can be a permanent magnet. Figure 2 and Figure 3 It can be seen that a group of magnets 31 can be installed on the inner wall opposite to each other in the reaction component 4, and the magnets 31 can be installed in parallel with the stock liquid chamber 32, and the two magnets 31 are oppositely polarized and parallel to each other. A magnetic field space is generated between the magnets 31, and the stock liquid chamber 32 covered with the ion exchange membrane 33 is arranged in the magnetic field space. When the tail water in the stock liquid chamber 32 enters the magnetic field space by the power provided by the water pump 5, the charged ions in the tail water are deflected under the influence of the Lorentz force and perform circular motion or spiral motion in the magnetic field. Since the ion exchange membrane 33 has a directional permeation effect, the ammonium ions and phosphate ions to be removed will be transmitted from the stock liquid chamber 32. The magnet 31 can be a permanent magnet of 0.1 to 0.5 T. It is worth noting that the distance between the two magnets 31 needs to be adjusted so that the Larmor radius of the ion movement and the radius of the pipe 321 are at the same order of magnitude to ensure that the ions can be successfully deflected from the stock liquid chamber 32. In order to increase the Lorentz force exerted on the ions, the magnet 31 may also be an electromagnet.

[0032] The reaction assembly 4 includes an anion reaction chamber 41 and a cation reaction chamber 42, and both the anion reaction chamber 41 and the cation reaction chamber 42 are connected to the culture pond 1 through the delivery pipeline 2. If the tail water only needs to treat ammonia nitrogen or phosphate, only the cation reaction chamber 42 or the anion reaction chamber 41 needs to be set.

[0033] Combination Figure 4 It can be known that the anion reaction chamber 41 is correspondingly provided with the stock solution chamber 32 with the anion exchange membrane. When the tail water passes through the anion exchange membrane, the anion exchange membrane selectively permeates the anions. Therefore, the phosphate ions can pass through the anion exchange membrane under the action of the Lorentz force and enter the anion reaction chamber 41 from the stock solution chamber 32. The anion reaction chamber 41 stores an anion reaction solution 43, which is used to consume phosphate ions. The anion reaction solution 43 can be selected from lanthanum chloride solution, which can be prepared from lanthanum chloride hexahydrate or anhydrous lanthanum chloride. Lanthanum chloride will react with phosphate ions to form an insoluble precipitate, thereby reducing the phosphate concentration in the tail water.

[0034] Similarly, the cation reaction chamber 42 is provided with the stock solution chamber 32 with the cation exchange membrane, and stores the cation reaction liquid 44, and the cation reaction liquid 44 can be selected from sodium hydroxide solution to ensure that the cation reaction chamber 42 is a strong alkaline environment with a pH value greater than 10. The ammonium ions deflected from the cation exchange membrane can be combined with hydroxide ions to generate ammonia gas, and the solubility of ammonia gas in alkaline solution is relatively low, and the ammonia gas will escape from the cation reaction chamber 42 to achieve the removal of ammonium ions in the tail water.

[0035] As the deammonification and dephosphorization process continues, ammonium ions and phosphate ions continue to enter the cation reaction chamber 42 and the anion reaction chamber 41. The ammonia nitrogen and phosphate content in the water discharged from the tail end of the stock liquid chamber 32 are low. Therefore, the treated water can be directly discharged back to the breeding pond 1 from the outlet 22 of the delivery pipeline 2. At the same time, the cation reaction liquid 44 in the cation reaction chamber 42 and the anion reaction liquid 43 in the anion reaction chamber 41 will also be lost, and the reaction assembly 4 needs to be regularly replenished and cleaned.

[0036] Furthermore, a device for treating aquaculture tailwater with a magnetic field coupled membrane was used to conduct a dynamic control experiment. The changes in the concentrations of ammonium ions and phosphates in the water are shown in Tables 1 and 2. The dynamic control experiment used a chemical control group and a biological load group for comparison. Each group of water was 10m 3The experimental period was 48 hours, and samples were collected every 2 hours. Among them, the chemical control group used ammonium sulfate and disodium hydrogen phosphate with concentrations of 10 mg / L and 5 mg / L as the source of ammonia nitrogen and phosphate, and the biological load group was stocked with white shrimp (biomass 10 kg / m 3 ) to metabolize to produce ammonia nitrogen and phosphate. Both groups used 0.1T permanent magnets, the distance between the two opposing magnets was 10cm, and the selected area was 0.3m 2 ion exchange membrane and use water pumps for water circulation.

[0037] Table 1 Changes in the concentrations of ammonium ions and phosphates in the chemical control group

[0038]

[0039] Table 2 Changes in ammonium ion and phosphate concentrations in the bioburden group

[0040]

[0041] As shown in Tables 1 and 2 above, after 48 hours of treatment, the concentration of ammonium ions in the chemical control group dropped from 10 mg / L to about 4.63 mg / L, and the concentration of phosphate dropped from 5 mg / L to about 2.30 mg / L, with a removal rate of about 54%; the water in the biological load group was initially unpolluted, and as it gradually accumulated, the concentration of ammonium ions stabilized at about 2.01 mg / L, and the concentration of phosphate stabilized at about 1.52 mg / L–1.53 mg / L, and the fluctuation range of the concentration of ammonium ions and phosphate concentrations was consistent with the actual breeding environment. The results show that under the synergistic effect of the magnetic field and the ion membrane, the concentration of pollutants in the chemical control group dropped rapidly, while in the biological load group, pollutants accumulated first and then reached a state of equilibrium.

[0042] In summary, the present invention provides a device for treating aquaculture tail water with a magnetic field coupled membrane. By coating the ion exchange membrane 33 outside the stock liquid chamber 32 and installing the magnet 31 on both sides of the stock liquid chamber 32, the ammonium ions and phosphate ions in the tail water are effectively removed through the action of the magnetic field and the selective permeability of the membrane. At the same time, the stock liquid chamber 32 is immersed in the ion reaction solution, and the ammonium ions and phosphate ions that penetrate from the stock liquid chamber 32 can directly react with the ion reaction solution. The design of the device is suitable for continuous flow treatment, and can remove ammonia nitrogen and phosphate in the tail water in real time to avoid the accumulation of pollutants in the target aquaculture water body. At the same time, the device has the advantages of low energy consumption and compact structure. It adopts a modular design concept, which can not only realize flexible adjustment, but also facilitate subsequent installation and maintenance work, and can effectively meet the needs of multiple scenarios.

[0043] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person having ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims

1. A device for treating aquaculture tail water by using a magnetic field coupled membrane, characterized in that: The device includes a breeding pond, a conveying pipeline, at least one separation component and at least one reaction component. The reaction component is connected to the breeding pond through the conveying pipeline, and the separation component is installed in the reaction component; the separation component includes at least two magnets, a stock solution chamber and an ion exchange membrane. The two ends of the stock solution chamber are connected to the conveying pipe, the ion exchange membrane is wrapped on the outside of the stock solution chamber, and the magnets are fixed on both sides of the stock solution chamber.

2. The device for treating aquaculture tail water by using a magnetic field coupling membrane according to claim 1, characterized in that: The raw liquid chamber comprises a pipeline, at least one through hole is formed on the pipeline, and the through hole is covered with the ion exchange membrane.

3. The device for treating aquaculture tail water by using a magnetic field coupled membrane according to claim 1, characterized in that: The magnets are installed on opposite inner walls of the reaction component, and the two magnets have opposite poles and are parallel to each other, and a magnetic field space is generated between the magnets.

4. The device for treating aquaculture tail water using a magnetic field coupled membrane according to claim 3, characterized in that: The reaction assembly comprises an anion reaction chamber and a cation reaction chamber, and both the anion reaction chamber and the cation reaction chamber are connected to the culture pond through the transport pipeline.

5. The device for treating aquaculture tail water by using a magnetic field coupled membrane according to claim 4, characterized in that: The anion reaction chamber is filled with anion reaction liquid, and the stock liquid chamber wrapped with the anion exchange membrane is immersed in the anion reaction liquid and is arranged in the magnetic field space.

6. The device for treating aquaculture tail water by using a magnetic field coupled membrane according to claim 4, characterized in that: The cation reaction chamber is filled with a cation reaction solution, and the stock solution chamber wrapped with the cation exchange membrane is immersed in the cation reaction solution and is arranged in the magnetic field space.

7. The device for treating aquaculture tail water using a magnetic field coupled membrane according to claim 5, characterized in that: The anion reaction solution is selected from lanthanum chloride solution.

8. The device for treating aquaculture tail water using a magnetic field coupled membrane according to claim 6, characterized in that: The cationic reaction liquid is selected from sodium hydroxide solution, and the pH of the cationic reaction liquid is greater than 10.

9. The device for treating aquaculture tail water using a magnetic field coupled membrane according to claim 1, characterized in that: A water pump is arranged at the water inlet of the conveying pipeline to provide power for the tail water in the breeding pond to enter the separation component.

10. The device for treating aquaculture tail water using a magnetic field coupled membrane according to claim 9, characterized in that: The water outlet of the conveying pipeline is connected to the breeding pond.

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