Nanowire electrode electroporation disinfection device reinforced by alternating electric field

Abstract

The utility model relates to the technical field of environment-friendly water treatment, in particular to an alternating electric field reinforced nanowire electrode electroporation disinfection device which comprises a shell, a water inlet is formed in the lower end of the shell, a water outlet is further formed in the upper end of the shell, and a working electrode chamber and a counterpoint electrode chamber are respectively arranged in the shell. A square wave power supply is fixed on one side of the outer wall surface of the shell, binding posts at the two ends of the square wave power supply are connected with connector lugs through wires respectively, and the connector lugs penetrate through the surface of the shell. The working electrode chamber and the counterpoint electrode chamber can be quickly assembled in the shell through a frame structure, during replacement, the working electrode chamber and the counterpoint electrode chamber can be manually and directly disassembled conveniently, a stable electrifying effect can be achieved through contact between a connector lug of a square wave power supply and a frame, access of a cathode power supply and an anode power supply is achieved, and the filter screen structure is additionally arranged in the connecting pipe, so that the connecting pipe is convenient to replace. When water is supplied, impurities in water can be filtered, so that the impurities are prevented from being gathered and attached in an electrode area.

Description

Technical Field

[0001] The utility model relates to the technical field of environmentally friendly water treatment, in particular to a nanowire electrode electroporation disinfection device enhanced by an alternating electric field. Background Art

[0002] With the development of nanotechnology, conductive nanowires with high aspect ratios (length to diameter ratio) can generate strong electric fields at their tips at low voltages, acting like lightning rods at spatial scales. Brief (μs-ns) exposure to electric fields exceeding 10⁵ V / m destabilizes the cell membrane phospholipid bilayer and protein capsid, forming pores in the phospholipid membrane or opening protein channels, leading to extravasation of intracellular material and membrane perforation and inactivation. The resulting nanowire electroporation disinfection technology, with its advantages of low voltage drive, low potential for byproduct generation, and the absence of microbial reactivation, has recently gained increasing attention in water treatment and disinfection applications.

[0003] Nanowire electroporation disinfection technology is essentially a solid-liquid interface reaction. The electric field strength at the nanowire array interface decreases significantly with increasing distance from the nanowire tip. Microorganisms need to transfer mass within the strong electric field range before membrane perforation and inactivation can occur. At the same time, the inactivated microorganisms need to detach from the electrode surface in time to achieve renewal of the electrode's strong electric field interface and stable disinfection.

[0004] However, the current nanowire electroporation disinfection technology mainly uses a DC voltage power supply method. In the conventional recycled water pH range of 6.0-9.0, the surface of microorganisms (the isoelectric points of bacteria and viruses are between pH 2-5 and 4.0-5.5, respectively) carries a negative net charge. The electric field attraction will drive the microorganisms to be exposed to the strong electric field interface of the anode, but the microorganisms will gradually adsorb and accumulate on the anode surface, causing the strong electric field interface of the anode to gradually "passivate". The electric field repulsion will drive the microorganisms to move to the low electric field area, resulting in low efficiency of the cathode in inactivating microorganisms.

[0005] Traditional electroporation disinfection experiments mainly focus on optimizing the disinfection effect of electrode materials under DC voltage. The anode in the electroporation disinfection device is a metal oxide electrode or a carbon cloth electrode, and the cathode is made of the same conductive material. However, the cathode does not function when the system is working, which reduces the current utilization rate and increases operating costs. The inactivated microorganisms are deposited on the surface of the anode, which will reduce the reaction area and reduce the conductivity, affecting the disinfection effect and energy consumption costs.

[0006] In summary, in order to address the problems of nanowire electrode contamination and gradually reduced disinfection efficiency under DC voltage power supply, it is urgent to explore an efficient and stable nanowire electrode electroporation disinfection operation mode to improve the disinfection effect. Utility Model Content

[0007] The purpose of the utility model is to solve the above-mentioned shortcomings in the prior art and to propose an alternating electric field enhanced nanowire electrode electroporation disinfection device.

[0008] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0009] A nanowire electrode electroporation disinfection device enhanced by an alternating electric field is designed, comprising a housing, a water inlet being provided at the lower end of the housing, a water outlet being provided at the upper end of the housing, a working electrode chamber and a counter electrode chamber being provided inside the housing, a square wave power supply being fixed to one side of the outer wall of the housing, and terminal blocks at both ends of the square wave power supply being connected to terminal blocks via wires, the terminal blocks penetrating the surface of the housing, and the terminal blocks being fixed to the inner wall of the housing by welding;

[0010] The lower end flange of the water inlet is connected to a connecting pipe, the other end of the connecting pipe is provided with a peristaltic pump, and the water outlet end of the peristaltic pump is assembled with the end flange of the connecting pipe.

[0011] In detail, a frame is fixed on the edge of the counter electrode chamber, a limit frame is fixed on the inner wall of the shell, the frame and the limit frame are slidably arranged to penetrate each other, and the frame is also tightly arranged to the connection head of the square wave power supply.

[0012] In detail, positioning rings are fixed on both sides of the frame, a positioning pin is slidably inserted into the interior of the positioning ring, a spring is wound around the surface of the positioning pin, and both ends of the spring are respectively welded and fixed to the positioning pin and the positioning ring.

[0013] In detail, a positioning groove is opened on the inner wall of the shell, and the positioning pin is slidably inserted into the positioning groove and docked. The installation method of the working electrode chamber is the same as that of the counter electrode chamber.

[0014] In detail, an annular plate is provided inside the connecting pipe, and a filter is fixed inside the annular plate.

[0015] In detail, a stopper is fixed on the inner wall of the connecting pipe, the end surface of the annular plate is tightly arranged on the surface of the stopper, and a handle is fixed on the other side of the annular plate.

[0016] Specifically, the outer wall of the annular plate is provided with an external thread, the inner wall of the connecting pipe is provided with an internal thread, and the internal thread and the external thread are threadably connected to each other.

[0017] The design scheme proposed by the utility model has the following beneficial effects during application:

[0018] 1. Both the working electrode chamber and the counter electrode chamber can be quickly assembled into the shell through the frame structure. When replacing, they can be easily removed manually. The connection head of the square wave power supply is in contact with the frame to achieve a stable power-on effect and realize the access of the cathode power supply and the anode power supply. By adding a filter structure in the connecting pipe, impurities in the water can be filtered during water supply, thereby preventing impurities from gathering and adhering to the electrode area.

[0019] 2. The alternating electric field-enhanced nanowire electrode electroporation disinfection method adopts a square wave alternating voltage supply method. By optimizing the square wave alternating voltage supply parameters (voltage, frequency and duty cycle), it regulates the contact migration, membrane perforation inactivation and detachment migration process of microorganisms at the strong electric field interface of the electrode, and simultaneously enhances the anti-fouling performance and disinfection efficiency of the nanowire electrode, realizing the long-term operation of the disinfection technology.

[0020] 3. On the one hand, it can prevent the aggregation of negatively charged microorganisms on the surface of the electrode plate during single anode disinfection, and has a certain ability to prevent anode scaling. On the other hand, the change in voltage direction enables both electrode plates to perform nanowire electroporation disinfection, which not only improves the utilization rate of the electrode plates, extends the service life of the electrode plates, and achieves efficient and stable disinfection effects, but also has the advantages of low energy consumption and high efficiency, and is suitable for point source or auxiliary water disinfection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of the utility model;

[0023] Figure 3 This is an enlarged schematic diagram of point A of the present utility model;

[0024] Figure 4 This is an enlarged schematic diagram of point B of the present utility model;

[0025] Figure 5 This is a schematic structural diagram of the intra-electrode filtration and disinfection device based on nanowire porous electrodes of the present invention.

[0026] In the figure: 1. water inlet; 2. working electrode chamber; 3. counter electrode chamber; 4. water outlet; 5. square wave power supply; 6. peristaltic pump; 7. housing; 8. connecting pipe; 31. limit frame; 32. frame; 33. positioning ring; 34. positioning groove; 35. spring; 36. positioning pin; 81. annular plate; 82. filter screen; 83. block; 84. handle; 85. external thread; 86. internal thread. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] Example I

[0029] Reference Figure 1-5 A nanowire electrode electroporation disinfection device enhanced by an alternating electric field comprises a housing 7, characterized in that a water inlet 1 is provided at the lower end of the housing 7, a water outlet 4 is provided at the upper end of the housing 7, a working electrode chamber 2 and a counter electrode chamber 3 are provided inside the housing 7, a square wave power supply 5 is fixed to one side of the outer wall of the housing, and the terminal posts at both ends of the square wave power supply 5 are connected to terminal blocks via wires, the terminal blocks penetrate the surface of the housing 7, and the terminal blocks are fixed to the inner wall of the housing 7 by welding;

[0030] The lower end flange of the water inlet 1 is connected to a connecting pipe 8 , and the other end of the connecting pipe 8 is provided with a peristaltic pump 6 , and the water outlet end of the peristaltic pump 6 is assembled with the end flange of the connecting pipe 8 .

[0031] It should be further explained that a frame 32 is fixed to the edge of the counter electrode chamber 3, and a limit frame 31 is fixed on the inner wall of the shell 7. The frame 32 and the limit frame 31 are slidably penetrated, and the frame 32 is also tightly set to the terminal of the square wave power supply 5.

[0032] It should be further explained that a positioning ring 33 is fixed on both sides of the frame 32, a positioning pin 36 is slidably inserted into the interior of the positioning ring 33, a spring 35 is wrapped around the surface of the positioning pin 36, and the two ends of the spring 35 are respectively welded and fixed to the positioning pin 36 and the positioning ring 33.

[0033] It should be further explained that a positioning groove 34 is provided on the inner wall of the housing 7 , and the positioning pin 36 is slidably inserted into and docked with the positioning groove 34 . The installation method of the working electrode chamber 2 is the same as that of the counter electrode chamber 3 .

[0034] It should be further explained that an annular plate 81 is provided inside the connecting pipe 8 , and a filter screen 82 is fixed inside the annular plate 81 .

[0035] It should be further explained that a stopper 83 is fixed on the inner wall of the connecting pipe 8 , the end surface of the annular plate 81 is tightly attached to the surface of the stopper 83 , and a handle 84 is fixed on the other side of the annular plate 81 .

[0036] It should be further explained that the outer wall of the annular plate 81 is provided with an external thread 85 , and the inner wall of the connecting pipe 8 is provided with an internal thread 86 , and the internal thread 86 and the external thread 85 are threadably connected to each other.

[0037] Working method: When the working electrode chamber 2 or the counter electrode chamber 3 needs to be installed, taking the counter electrode chamber 3 as an example, its frame 32 is slid into the housing 7, and its position is limited by the limit frame 31. The spring 35 resets the positioning pin 36 to be inserted into the positioning groove 34, thereby achieving the fixation of the frame 32 and the housing 7;

[0038] When the peristaltic pump 6 is transporting liquid, the particulate impurities in the liquid can be filtered through the filter 82 to prevent them from gathering and adhering to the working electrode chamber 2 and the counter electrode chamber 3. When the filter 32 needs to be cleaned or replaced, the connecting tube 8 is removed and the annular plate 81 is rotated by the handle 84 to separate the internal thread 86 from the external thread 85, so that the filter 82 can be removed from the connecting tube 8.

[0039] The alternating electric field enhanced nanowire electrode electroporation disinfection method of this embodiment includes the following steps:

[0040] A filtration and disinfection device with a carbon fiber felt electrode loaded with titanium dioxide nanowires and a diameter of 2.5 cm and a thickness of 0.5 cm was built. The disinfection device was connected to a square wave power supply. A solution containing 104 CFU / mL of Escherichia coli entered the disinfection device from the water inlet at a flow rate of 25 mL / min. The square wave power supply was started with a voltage of 1 V, a frequency of 0.5 Hz, and a duty cycle of 50%.

[0041] The high level of the square wave power supply is supplied to the nanowire porous working electrode, that is, the working electrode is the anode. Due to the attraction of the electric field, the microorganisms are enriched at the electrode interface and are inactivated at the electrode interface; the negative level is supplied to the nanowire porous counter electrode, that is, the counter electrode is the cathode.

[0042] After 2 seconds, the high level of the square wave power supply is supplied to the nanowire porous counter electrode, which is the anode. The microorganisms are enriched at this interface and inactivated at the electrode interface; the negative level is supplied to the nanowire porous working electrode, and the microorganisms originally enriched on the electrode surface are expelled due to the electric field repulsion.

[0043] The above voltage exchange was repeated 6 times and the operation lasted for 10 min. The removal rate of E. coli in the treated effluent was 4 log.

[0044] Example II

[0045] See also Figure 5 A filtration and disinfection device with a carbon fiber felt electrode loaded with titanium dioxide nanowires and a diameter of 5 cm was built. The disinfection device was connected to a square wave power supply. A solution containing 106 CFU / mL of Escherichia coli entered the disinfection device from the water inlet with a flow rate of 50 mL / min. The square wave power supply was started with a voltage of 5 V, a frequency of 2.5 Hz, and a duty cycle of 75%.

[0046] The high level of the square wave power supply is supplied to the nanowire porous working electrode, that is, the working electrode is the anode; the negative level is supplied to the nanowire porous counter electrode, that is, the counter electrode is the cathode.

[0047] After 0.4s, the high level of the square wave power supply is supplied to the nanowire porous counter electrode, which serves as the anode. The microorganisms are inactivated at the electrode interface and enriched on this interface. The negative level is supplied to the nanowire porous working electrode, and the microorganisms originally enriched on the electrode surface are driven away due to the electric field repulsion.

[0048] The above voltage exchange was repeated 59 times and the operation lasted for 10 minutes. The removal rate of E. coli in the treated effluent was 5.73 log.

[0049] Example III

[0050] See also Figure 5 A filtration and disinfection device with a carbon fiber felt electrode loaded with titanium dioxide nanowires and a diameter of 5 cm was built. The disinfection device was connected to a square wave power supply. A solution containing 106 CFU / mL of Escherichia coli entered the disinfection device from the water inlet with a flow rate of 25 mL / min. The square wave power supply was started with a voltage of 5 V, a frequency of 0.5 Hz, and a duty cycle of 25%.

[0051] The high level of the square wave power supply is supplied to the nanowire porous working electrode, that is, the working electrode is the anode; the negative level is supplied to the nanowire porous counter electrode, that is, the counter electrode is the cathode.

[0052] After 2 seconds, the high level of the square wave power supply is supplied to the nanowire porous counter electrode, which is the anode; the negative level is supplied to the nanowire porous working electrode, and the microorganisms originally enriched on the electrode surface are driven away due to the electric field repulsion.

[0053] The above power supply mode was repeated 24 times. After running for 10 minutes, the removal rate of E. coli in the effluent was 4.59 log.

[0054] Comparative Example 1

[0055] The same in-electrode filtration disinfection device as in Example 1 was built and connected to a DC power supply. The E. coli solution was treated under the same conditions as above, and the removal rate was 0.83 log.

[0056] Comparative Example 2

[0057] The same in-electrode filtration disinfection device as in Example 1 was constructed and connected to a square wave power supply. A solution containing 104 CFU / mL of Escherichia coli entered the disinfection device from the water inlet at a flow rate of 25 mL / min. The square wave power supply was started with a voltage of 1 V, a frequency of 2.5 Hz, and a duty cycle of 50%.

[0058] After running for 10 minutes, the removal rate of E. coli in the treated effluent was 0.90 log.

[0059] Comparative Example 3

[0060] The same in-electrode filtration disinfection device as in Example 1 was constructed and connected to a square wave power supply. A solution containing 106 CFU / mL of Escherichia coli entered the disinfection device from the water inlet at a flow rate of 50 mL / min. The square wave power supply was started with a voltage of 5 V, a frequency of 1 Hz, and a duty cycle of 25%.

[0061] After running for 10 minutes, the removal rate of E. coli in the treated effluent was 1.29 log.

[0062] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A nanowire electrode electroporation disinfection device enhanced by an alternating electric field, comprising a housing (7), characterized in that: The lower end of the shell (7) is provided with a water inlet (1), and the upper end of the shell (7) is also provided with a water outlet (4). The interior of the shell (7) is provided with a working electrode chamber (2) and a counter electrode chamber (3). A square wave power supply (5) is fixed to one side of the outer wall of the shell. The two end terminals of the square wave power supply (5) are respectively connected to the terminal blocks via wires. The terminal blocks penetrate the surface of the shell (7), and the terminal blocks are fixed to the inner wall of the shell (7) by welding. The lower end flange of the water inlet (1) is connected to a connecting pipe (8), the other end of the connecting pipe (8) is provided with a peristaltic pump (6), and the water outlet end of the peristaltic pump (6) is assembled with the end flange of the connecting pipe (8).

2. The alternating electric field enhanced nanowire electrode electroporation disinfection device according to claim 1, characterized in that: A frame (32) is fixed to the edge of the counter electrode chamber (3), and a limit frame (31) is fixed on the inner wall of the shell (7). The frame (32) and the limit frame (31) are slidably arranged to penetrate each other, and the frame (32) is also tightly arranged to the connection head of the square wave power supply (5).

3. The alternating electric field enhanced nanowire electrode electroporation disinfection device according to claim 2, characterized in that: Positioning rings (33) are fixed on both sides of the frame (32), a positioning pin (36) is slidably inserted into the interior of the positioning ring (33), a spring (35) is wound around the surface of the positioning pin (36), and both ends of the spring (35) are respectively welded and fixed to the positioning pin (36) and the positioning ring (33).

4. The alternating electric field enhanced nanowire electrode electroporation disinfection device according to claim 3, characterized in that: A positioning groove (34) is provided on the inner wall of the housing (7), and the positioning pin (36) is slidably inserted into and docked with the positioning groove (34). The installation method of the working electrode chamber (2) is the same as that of the counter electrode chamber (3).

5. The alternating electric field enhanced nanowire electrode electroporation disinfection device according to claim 1, characterized in that: An annular plate (81) is provided inside the connecting pipe (8), and a filter screen (82) is fixed inside the annular plate (81).

6. The alternating electric field enhanced nanowire electrode electroporation disinfection device according to claim 5, characterized in that: A stopper (83) is fixed on the inner wall of the connecting tube (8), the end surface of the annular plate (81) is tightly arranged on the surface of the stopper (83), and a handle (84) is fixed on the other side of the annular plate (81).

7. The alternating electric field enhanced nanowire electrode electroporation disinfection device according to claim 6, characterized in that: The outer wall of the annular plate (81) is provided with an external thread (85), and the inner wall of the connecting pipe (8) is provided with an internal thread (86), and the internal thread (86) and the external thread (85) are threadably connected to each other.

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