A device and method for treating aquaculture tail water based on piezoelectric strengthening

Abstract

The application relates to a breeding tail water treatment device and method based on piezoelectric strengthening, which comprises a water supply pump, a jet aerator, a biological aerated filter and an anaerobic tank. The application can improve the oxygen content of sewage and can induce piezoelectric air filter membranes to generate piezoelectric effect through flowing air, so as to obtain piezoelectric charge and voltage. The piezoelectric charge can react with oxygen and water to generate active oxygen species, so as to realize the conversion of air kinetic energy into electric energy and chemical energy. The piezoelectric voltage directly drives the anode and the cathode to work, and can enrich the functional bacteria of the biological treatment unit, improve the activity of functional microorganisms, and the active oxygen species can directly degrade organic pollutants, so as to synergistically enhance the performance of removing pollutants.

Description

Technical Field

[0001] This invention relates to the field of aquaculture wastewater treatment technology, specifically to an aquaculture wastewater treatment device and method based on piezoelectric enhancement. Background Technology

[0002] The main water quality characteristics of aquaculture wastewater are high salinity and salinity fluctuations. The main sources and proportions of pollutants in aquaculture wastewater are excess feed, metabolites, domestic waste, antibiotics used for pest and disease control, and disinfectants used for cleaning aquaculture ponds. Direct discharge of untreated aquaculture wastewater will have a serious impact on the environment. Aquaculture wastewater treatment technologies are mainly divided into three categories: physical, chemical, and biological. Among them, microbial methods, as a type of biological treatment technology, have broad application prospects due to their advantages such as small footprint, low operating costs, convenient management, and high efficiency.

[0003] Patent CN 113772900 A discloses a high-efficiency nitrogen and phosphorus removal process system for treating aquaculture wastewater, including a physical filtration device, a high-efficiency biological treatment unit, a flocculation sedimentation tank, a sand filter, a clear water tank, and a sludge tank. The biological treatment unit consists of an aerated biological filter, an anaerobic tank, and another aerated biological filter connected in sequence. This device has a relatively complex biological treatment process, produces sludge, and requires the addition of a carbon source to enhance treatment performance. To further improve the treatment performance of aquaculture wastewater, patent CN 113371816 B discloses a high-efficiency nitrogen removal reactor, system, and method for aquaculture wastewater. The reactor body is divided into a cathode chamber and an anode chamber from top to bottom. By realizing a high-efficiency nitrogen removal process driven by sulfur cycle, it effectively reduces carbon source consumption in the aquaculture wastewater treatment process and improves the treatment effect on nitrogen-containing wastewater. However, this invention has high energy consumption and high operating costs, and it enhances pollutant removal performance through a single method of weakly stimulating microbial activity, which has certain limitations in the removal of organic matter such as antibiotics.

[0004] In recent years, piezoelectric nanogenerators, which convert mechanical energy into electrical energy using piezoelectric materials, have attracted widespread attention. Patent CN 115536964 B discloses a flexible piezoelectric nanogenerator where pressure can excite the piezoelectric effect of the piezoelectric material layer, thereby outputting voltage. Furthermore, patent CN 116988914A discloses a marine energy harvesting device based on the piezoelectric effect, where ocean wave energy generates electricity by exciting the piezoelectric effect of the piezoelectric material in the power generation unit. In addition, patent CN111330640 B discloses a piezoelectric catalytic air filter membrane for air purification. When air flows through the piezoelectric catalytic filter membrane, airflow disturbances can excite the piezoelectric effect of the membrane, generating an electric charge. This charge can react with oxygen in the air to generate reactive oxygen species, such as superoxide radicals, thereby achieving air purification.

[0005] In the current process of treating aquaculture wastewater using microbial methods, pollutant removal mainly relies on the metabolism of microorganisms. However, functional bacteria are not well adapted to high-salt environments, resulting in inhibited growth of functional microorganisms, leading to poor pollutant removal performance and instability. Furthermore, the traditional method of using weak electrical intervention to enhance treatment results in high energy consumption of the treatment system and high cost of aquaculture wastewater treatment. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a piezoelectric-enhanced aquaculture wastewater treatment device and treatment method to address the above-mentioned shortcomings.

[0007] To solve the above technical problems, the present invention adopts the following technical solution:

[0008] A piezoelectrically enhanced aquaculture wastewater treatment device includes a water supply pump, a jet aerator, an aerated biological filter, and an anaerobic tank.

[0009] The input end of the aerated biological filter is connected to the output end of the jet aerator, and the aerated biological filter is provided with a first cathode and a first anode.

[0010] The input end of the anaerobic tank is connected to the output end of the aerated biological filter, and a second cathode and a second anode are provided in the anaerobic tank.

[0011] The water supply pump is connected to the input end of the jet aerator. The jet aerator is equipped with an air intake port, and a piezoelectric air filter membrane is installed inside the air intake port. The water supply pump is used to pressurize the sewage and input it into the jet aerator. The jet aerator is used to convert the pressurized sewage into a high-speed jet. The negative pressure generated by the high-speed jet draws external air into the interior of the jet aerator from the air intake port, so that the sewage and air are mixed.

[0012] The first cathode, the first anode, the second cathode, and the second anode are all electrically connected to the piezoelectric air filter membrane.

[0013] Furthermore, the input end of the jet aerator is provided with a nozzle, which is connected to the water supply pump through an inlet pipe.

[0014] Furthermore, the jet aerator includes an intake chamber, a mixing chamber, and a diffusion chamber connected in sequence, and both the nozzle and the air intake port are connected to the intake chamber.

[0015] Furthermore, it also includes a first filter device, the output of which is connected to the input of the water supply pump.

[0016] Furthermore, it also includes a blower, and an aeration disc is provided at the bottom of the aerated biological filter, with the output end of the blower connected to the aeration disc.

[0017] Furthermore, it also includes a backwashing device, with a backwashing water pipe installed at the bottom of the aerated biological filter, and the backwashing device is connected to the backwashing water pipe.

[0018] Furthermore, it also includes a flocculation sedimentation device and a second filtration device, wherein the input end of the flocculation sedimentation device is connected to the output end of the anaerobic tank, and the input end of the second filtration device is connected to the output end of the flocculation sedimentation device.

[0019] A piezoelectric-enhanced aquaculture wastewater treatment method includes the following steps:

[0020] Wastewater pretreatment;

[0021] The pretreated wastewater is pressurized and then fed into the nozzle.

[0022] The pressurized wastewater is jetted through nozzles into a high-speed jet and enters the suction chamber. This high-speed jet creates negative pressure within the suction chamber, drawing in outside air through the air intake. As the air passes through the piezoelectric air filter membrane, a piezoelectric effect is generated.

[0023] Air and wastewater are mixed in the mixing chamber and then depressurized in the diffusion chamber to obtain primary treated water;

[0024] The piezoelectric effect generated by the piezoelectric air filter membrane is used to maintain the potential of the first cathode and the first anode. After the primary treated water is fed into the aerated biological filter for aeration treatment, secondary treated water is obtained.

[0025] The piezoelectric effect generated by the piezoelectric air filter membrane is used to maintain the potential of the second cathode and the second anode. After the secondary treated water is fed into the anaerobic tank for anaerobic reaction, tertiary treated water is obtained.

[0026] After phosphorus removal filtration, the treated water from the third stage is filtered to obtain compliant discharge water.

[0027] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages:

[0028] This invention introduces high-pressure wastewater into a jet aerator, creating negative pressure within the aerator. This draws in external air, mixing it with the wastewater. This process increases the oxygen content of the wastewater and induces a piezoelectric effect in the piezoelectric air filter membrane, generating piezoelectric charge and voltage. The piezoelectric charge reacts with oxygen and water to generate reactive oxygen species, thus converting air kinetic energy into electrical and chemical energy. The piezoelectric voltage directly drives the anode and cathode, selectively enriching functional bacteria in the biological treatment unit and enhancing their activity. The reactive oxygen species directly degrade organic pollutants, synergistically enhancing pollutant removal performance.

[0029] Furthermore, this device has a simple and compact structure, low operating costs, energy savings, and good treatment effect.

[0030] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0032] The attached diagram lists the components represented by each number as follows:

[0033] 1. Water supply pump; 2. Jet aerator; 21. Air intake; 2a. Suction chamber; 2b. Mixing chamber; 2c. Diffusion chamber; 3. Aerated biological filter; 31. First cathode; 32. First anode; 33. Blower; 34. Backwashing device; 4. Anaerobic tank; 41. Second cathode; 42. Second anode; 5. Piezoelectric air filter membrane; 6. Nozzle; 61. Inlet pipe; 7. First filtration device; 8. Flocculation and sedimentation device; 9. Second filtration device. Detailed Implementation

[0034] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0035] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise" and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0036] like Figure 1 As shown, a piezoelectric-enhanced aquaculture wastewater treatment device includes a water supply pump 1, a jet aerator 2, an aerated biological filter 3, and an anaerobic tank 4.

[0037] The input end of the aerated biological filter 3 is connected to the output end of the jet aerator 2. The aerated biological filter 3 is filled with packing material and inoculated with nitrifying bacteria (i.e., functional bacteria). The aerated biological filter 3 is equipped with a first cathode 31 and a first anode 32. The bottom of the aerated biological filter 3 is equipped with an aeration disc and a backwash water pipe. A blower 33 and a backwashing device 34 are also provided next to the aerated biological filter 3. The output end of the blower 33 is connected to the aeration disc, and the backwashing device 34 is connected to the backwash water pipe. The blower 33 and the aeration disc serve as supplementary devices when aeration is insufficient, while the backwashing device 34 and the backwash water pipe serve as supplementary devices to prevent packing material blockage.

[0038] The input end of the anaerobic tank 4 is connected to the output end of the aerated biological filter 3. The anaerobic tank 4 is filled with packing material and inoculated with denitrifying bacteria (i.e., functional bacteria). The anaerobic tank 4 is equipped with a second cathode 41 and a second anode 42.

[0039] The water supply pump 1 is connected to the input end of the jet aerator 2. The jet aerator 2 is provided with an air intake 21. A piezoelectric air filter membrane 5 is installed inside the air intake 21. The water supply pump 1 is used to pressurize the sewage and input it into the jet aerator 2. The jet aerator 2 is used to convert the pressurized sewage into a high-speed jet. The negative pressure generated by the high-speed jet draws external air into the interior of the jet aerator 2 from the air intake 21, so that the sewage and air are mixed and the oxygen content of the sewage is increased.

[0040] The first cathode 31, the first anode 32, the second cathode 41, and the second anode 42 are all electrically connected to the piezoelectric air filter membrane 5 (through wires).

[0041] The jet aerator 2 is equipped with a nozzle 6 at its input end, and the nozzle 6 is connected to the water supply pump 1 through a water inlet pipe 61. The jet aerator 2 includes a suction chamber 2a, a mixing chamber 2b, and a diffusion chamber 2c connected in sequence, and both the nozzle 6 and the air intake 21 are connected to the suction chamber 2a.

[0042] It also includes a first filter device 7, the output end of which is connected to the input end of the water supply pump 1.

[0043] It also includes a flocculation sedimentation device 8 and a second filtration device 9. The input end of the flocculation sedimentation device 8 is connected to the output end of the anaerobic tank 4, and the input end of the second filtration device 9 is connected to the output end of the flocculation sedimentation device 8.

[0044] Workflow:

[0045] (1) First, the aquaculture wastewater is fed into the first filter device 7 to remove suspended solids and impurities from the water.

[0046] (2) After the wastewater is initially filtered, it is pressurized by the water supply pump 1 and then used as working fluid to enter the nozzle 6 through the water inlet pipe 61. When the high-pressure working fluid passes through the nozzle 6, it forms a high-speed jet and generates a negative pressure at the output end of the nozzle 6, so that the suction chamber 2a is in a negative pressure state. External air is drawn into the suction chamber 2a through the air intake port 21. The strong shear force and turbulence generated by the high-speed jet can enhance the mass transfer effect of air-wastewater (thereby improving the oxygenation efficiency of the jet aerator 2). After the air and wastewater enter the mixing chamber 2b, they are mixed evenly in the mixing chamber to obtain oxygen-rich wastewater. Finally, the oxygen-rich wastewater is decelerated and depressurized in the diffusion chamber 2c to obtain primary treated water, which is then fed into the aerated biological filter through the pipeline.

[0047] When air passes through the air intake 21, it passes through the piezoelectric air filter membrane 5. The airflow disturbance can stimulate the piezoelectric effect of the air piezoelectric filter membrane 5, thereby generating piezoelectric voltage and charge. Electrons generated by the piezoelectric effect are introduced into the aerated biological filter 3 through the first cathode 31 and the first anode 32, and into the anaerobic tank 4 through the second cathode 41 and the second anode 42. On the one hand, it can stimulate the reaction between oxygen and water to generate active oxygen species; on the other hand, the piezoelectric voltage generated by the piezoelectric air filter membrane 5 can maintain the potential of the anode and cathode in the aerated biological filter 3 and the anaerobic tank 4, thereby enriching functional bacteria and stimulating their activity, thus enhancing the efficiency of denitrification and removal of organic matter.

[0048] (3) The primary treated water is in full contact with nitrifying bacteria in the aerated biological filter 3, so that ammonia nitrogen and other substances in the aquaculture tail water are converted into nitrite nitrogen by the functional bacteria of nitrifying bacteria, and further converted into nitrate nitrogen. After treatment, secondary treated water is obtained and is fed into the anaerobic tank 4 through pipeline.

[0049] (4) The secondary treated water comes into full contact with denitrifying bacteria in the anaerobic tank 4. Under the action of denitrifying bacteria, nitrate nitrogen and nitrite nitrogen in the water are converted into nitrogen gas, thus achieving denitrification. At the same time, some recalcitrant organic matter (such as antibiotics and other drugs) will be removed, thus obtaining tertiary treated water. The tertiary treated water is then fed into the flocculation sedimentation device 8 through a pipeline.

[0050] (5) The tertiary treated water is dephosphorized in the flocculation sedimentation device 8, and then filtered in the second filtration device 9 before being discharged in compliance with standards.

[0051] In summary, this invention utilizes air energy during jet aeration to induce a piezoelectric effect in the piezoelectric air filter membrane, generating piezoelectric charges and voltages. The piezoelectric charges react with oxygen and water to generate reactive oxygen species, which simultaneously drive the anodes and cathodes within the aerated biological filter and anaerobic tank via the piezoelectric voltage. This enriches functional microorganisms and enhances their activity, while the reactive oxygen species directly degrade organic pollutants, thus synergistically enhancing pollutant removal performance and improving the treatment effect of aquaculture wastewater. Without requiring additional electrical energy consumption, this invention provides reactive oxygen species, enriches functional microorganisms, and enhances their activity, thereby improving pollutant removal performance. The device has a simple and compact structure, low operating costs, energy savings, and good treatment effect.

[0052] A piezoelectric-enhanced aquaculture wastewater treatment method includes the following steps:

[0053] Step 1: Pre-treat the wastewater (in this embodiment, the pre-treatment of wastewater is filtration; other treatment steps can be added here without limitation);

[0054] Step 2: Pressurize the pretreated wastewater and then inject it into nozzle 6;

[0055] Step 3: The pressurized wastewater forms a high-speed jet through nozzle 6 and enters suction chamber 2a. The high-speed jet creates negative pressure in suction chamber 2a, and external air is drawn into suction chamber 2a through air intake port 21. When the air passes through piezoelectric air filter membrane 5, the piezoelectric effect is generated. The air and wastewater are mixed in mixing chamber 2b, and after deceleration and pressure reduction in diffusion chamber 2c, primary treated water is obtained.

[0056] Step 4: The piezoelectric effect generated by the piezoelectric air filter membrane 5 is used to maintain the potential of the first cathode 31 and the first anode 32. After the primary treated water is fed into the aerated biological filter tank 3 for aeration treatment, secondary treated water is obtained.

[0057] Step 5: The piezoelectric effect generated by the piezoelectric air filter membrane 5 is used to maintain the potential of the second cathode 41 and the second anode 42. After the secondary treated water is fed into the anaerobic tank 4 for anaerobic reaction, tertiary treated water is obtained.

[0058] Step 6: After phosphorus removal filtration of the tertiary treated water, compliant discharge water is obtained.

[0059] The above description provides examples of the preferred embodiments of the present invention. Parts not detailed herein are common knowledge to those skilled in the art. The scope of protection of the present invention is determined by the claims. Any equivalent modifications based on the technical teachings of the present invention are also within the scope of protection of the present invention.

Claims

1. A piezoelectric-enhanced aquaculture wastewater treatment device, characterized in that, It includes a water supply pump (1), a jet aerator (2), an aerated biological filter (3), and an anaerobic tank (4). The input end of the aerated biological filter (3) is connected to the output end of the jet aerator (2), and the aerated biological filter (3) is provided with a first cathode (31) and a first anode (32). The input end of the anaerobic tank (4) is connected to the output end of the aerated biological filter (3), and the anaerobic tank (4) is equipped with a second cathode (41) and a second anode (42). The water supply pump (1) is connected to the input end of the jet aerator (2). The jet aerator (2) is provided with an air intake (21). A piezoelectric air filter membrane (5) is provided inside the air intake (21). The water supply pump (1) is used to pressurize the sewage and input it into the jet aerator (2). The jet aerator (2) is used to convert the pressurized sewage into a high-speed jet. The negative pressure generated by the high-speed jet draws external air into the interior of the jet aerator (2) from the air intake (21), so that the sewage and air are mixed. The first cathode (31), the first anode (32), the second cathode (41), and the second anode (42) are all electrically connected to the piezoelectric air filter membrane (5).

2. The aquaculture wastewater treatment device based on piezoelectric enhancement according to claim 1, characterized in that, The jet aerator (2) is provided with a nozzle (6) at its input end, and the nozzle (6) is connected to the water supply pump (1) through a water inlet pipe (61).

3. The aquaculture wastewater treatment device based on piezoelectric enhancement according to claim 2, characterized in that, The jet aerator (2) includes an intake chamber (2a), a mixing chamber (2b) and a diffusion chamber (2c) connected in sequence, and the nozzle (6) and the air intake port (21) are both connected to the intake chamber (2a).

4. The aquaculture wastewater treatment device based on piezoelectric enhancement according to claim 1, characterized in that, It also includes a first filter device (7), the output end of which is connected to the input end of the water supply pump (1).

5. The aquaculture wastewater treatment device based on piezoelectric enhancement according to claim 1, characterized in that, It also includes a blower (33), and an aeration disc is provided at the bottom of the aerated biological filter (3), with the output end of the blower (33) connected to the aeration disc.

6. The aquaculture wastewater treatment device based on piezoelectric enhancement according to claim 1, characterized in that, It also includes a backwashing device (34), and a backwashing water pipe is provided at the bottom of the aerated biological filter (3), and the backwashing device (34) is connected to the backwashing water pipe.

7. The aquaculture wastewater treatment device based on piezoelectric enhancement according to claim 1, characterized in that, It also includes a flocculation sedimentation device (8) and a second filtration device (9), the input end of which is connected to the output end of the anaerobic tank (4), and the input end of the second filtration device (9) is connected to the output end of the flocculation sedimentation device (8).

8. A treatment method for aquaculture wastewater based on the piezoelectric enhancement treatment device according to any one of claims 1 to 7, characterized in that, Includes the following steps: Wastewater pretreatment; The pretreated wastewater is pressurized and then fed into nozzle (6); The pressurized wastewater forms a high-speed jet through the nozzle (6) and enters the suction chamber (2a). The high-speed jet creates a negative pressure in the suction chamber (2a), and external air is drawn into the suction chamber (2a) through the air intake port (21). When the air passes through the piezoelectric air filter membrane (5), a piezoelectric effect is generated. The air and wastewater are mixed in the mixing chamber (2b) and decelerated and depressurized in the diffusion chamber (2c) to obtain primary treated water. The piezoelectric effect generated by the piezoelectric air filter membrane (5) is used to maintain the potential of the first cathode (31) and the first anode (32). After the primary treated water is fed into the aerated biological filter (3) for aeration treatment, secondary treated water is obtained. The potential of the second cathode (41) and the second anode (42) is maintained by the piezoelectric effect generated by the piezoelectric air filter membrane (5). After the secondary treated water is fed into the anaerobic tank (4) for anaerobic reaction, tertiary treated water is obtained. After phosphorus removal filtration, the treated water from the third stage is filtered to obtain compliant discharge water.

Images