Low-frequency Plasma Pulse Regeneration Device for Caked Filter Media and Its Regeneration Method

Abstract

The present invention discloses a low-frequency plasma pulse plate-and-frame filter material regeneration device and a regeneration method thereof, including an externally supplied power source, a high-voltage cable, and a filter body. The left end of the externally supplied power source is electrically connected to a high-voltage pulse generator. Both ends of the high-voltage cable are fixedly connected with cable threaded joints. The right end of the high-voltage cable is electrically and fixedly connected to the high-voltage pulse generator through the cable threaded joint. The cable threaded joint on the left end of the high-voltage cable is screwed with a plasma discharge electrode. The surface of the plasma discharge electrode is threadedly connected with a reflection short circuit. The left end of the reflection short circuit is fixedly connected with a connection short circuit. A ball valve is arranged on the surface of the connection short circuit. The left end of the connection short circuit penetrates through the filter body and is hermetically and fixedly connected with the filter body. With the cooperation of the above structures, the present invention solves the problems of high cost in the traditional method, certain influence of the medicament on the quality of the treated sewage water, corrosion to the filter, and influence on the service life.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and specifically to a low-frequency plasma pulse agglomerated filter material regeneration device and a regeneration method thereof. Background Art

[0002] In the process of sewage treatment, using a filter to filter sewage is one of the most common sewage purification methods. The particle size of the filter material in the filter is generally 0.5 - 1.5 mm, and the thickness of the filter material is generally 700 - 1500 mm. Its materials are one or a mixture of sand, magnetite sand, emery, walnut shell, etc. The working principle of the filter is that sewage enters the filter from the water inlet of the filter, slowly passes through the filter material in the filter, and the filter material intercepts various impurities in the oily sewage to achieve the effect of purifying the sewage. When the impurities accumulate in the filter material to a certain extent, purified water many times larger than the filtered water volume enters the filter from the outlet of the filter, flushing the filter material layer, making the filter material form a boiling state in the filter, and allowing the filter material particles to collide, rub against each other, and undergo hydraulic shear, etc., so that the impurities adsorbed and deposited on the surface of the filter material fall off, and then are discharged out of the tank with the backwash water, achieving the purpose of regenerating the filter material. Since the filter material is immersed in sewage containing calcium ions, magnesium ions, and saprophytic bacteria, etc., calcium ions, magnesium ions, and saprophytic bacteria in the sewage and the like will cause the filter material to agglomerate into a block and become ineffective. During the backwashing process of the filter material, due to the low backwashing intensity, the agglomerated filter material block cannot be flushed to a boiling state, and the purpose of regenerating the agglomerated filter material cannot be achieved, seriously affecting the treatment effect of the filter.

[0003] In order to prevent the agglomeration of the filter material, there are usually two methods:

[0004] First, continuously add chemical agents such as scale inhibitors and bactericides with a certain concentration to the filtered sewage to prevent calcium and magnesium ions and bacteria in the sewage from causing the filter material to agglomerate into a block.

[0005] Second, regularly inject acid into the filter to dissolve the scale-type cementing substances and kill the bacterial colonies in the filter material, achieving the purpose of regenerating the agglomerated filter material.

[0006] The disadvantages of the above two methods are as follows: the former requires continuous injection of chemicals, which not only has a high cost, but also has a certain impact on the water quality of the treated sewage; while the latter, acid solution, also requires a large amount of chemical agents, which not only increases the cost, but also corrodes the filter, affecting its service life. Summary of the Invention

[0007] The purpose of the present invention is to provide a low-frequency plasma pulse agglomerated filter material regeneration device and a regeneration method thereof, which improve the traditional device and solve the problems in the background art.

[0008] To achieve the above object, the present invention provides the following technical solutions: a low-frequency plasma pulse plate-and-frame filter material regeneration device and its regeneration method, including an external power supply, a high-voltage cable, and a filter body. The left end of the external power supply is electrically connected to a high-voltage pulse generator. Both ends of the high-voltage cable are fixedly connected with cable threaded joints. The right end of the high-voltage cable is electrically and fixedly connected to the high-voltage pulse generator through the cable threaded joint. The cable threaded joint on the left end of the high-voltage cable is screwed with a plasma discharge electrode. The surface of the plasma discharge electrode is threadedly connected with a reflection short circuit. The left end of the reflection short circuit is fixedly connected with a connection short circuit. A ball valve is arranged on the surface of the connection short circuit. The left end of the connection short circuit penetrates through the filter body and is hermetically and fixedly connected to the filter body. The inside of the filter body is filled with filter material. The bottom and top of the filter body are respectively provided with a filter water outlet and a filter water inlet.

[0009] Preferably, the plasma discharge electrode includes an insulating and sealing material, a cathode discharge bracket, a metal shell, and an anode

[0010] discharge head. The surface of the insulating and sealing material is fixedly connected to the inner wall of the metal shell. The right end of the cathode discharge bracket is electrically and fixedly connected to the left end of the metal shell. The surface of the cathode discharge bracket is welded with a cathode discharge head. External threads one and two are respectively arranged on the surface of the metal shell near the right end and the middle. The metal shell is threadedly connected to the inner wall of the cable threaded joint through the external thread one. The metal shell is threadedly connected to the inner wall of the reflection short circuit through the external thread two. An anode column is fixedly connected to the inner wall of the insulating and sealing material. The left end of the anode column is electrically and fixedly connected to the anode discharge head. The cathode discharge head and the anode discharge head are coaxial and concentric.

[0011] Preferably, the reflection short circuit includes a reflection short circuit body. The inner wall of the reflection short circuit body near the right end is provided with an internal thread and is threadedly connected to the external thread two through the internal thread.

[0012] Preferably, the left end of the reflection short circuit body is fixedly connected with a reflection short circuit connection flange. The left side of the reflection short circuit connection flange is hermetically and fixedly connected to the right end of the connection short circuit.

[0013] Preferably, the inside of the reflection short circuit body is a parabolic reflection surface opening to the left and coaxial with the plasma discharge electrode. The midpoint of the anode discharge head and the cathode discharge head coincides with the focus of the parabolic reflection surface on the reflection short circuit body, and the non-coincidence degree is less than 1.5 mm.

[0014] Preferably, the right end of the reflection short circuit body is movably connected with an adjusting gasket. The inner wall of the adjusting gasket is slidably connected to the surface of the metal shell.

[0015] Preferably, a usage method of the device as described above includes the following steps:

[0016] The steps of the regeneration method for the low-frequency plasma pulsed caked filter media are as follows:

[0017] First step: Connect the low-frequency plasma pulsed caked filter media regeneration device to the ball valve of the short connection on the filter body. Open the ball valve to fill the space inside the reflection short connection with sewage;

[0018] Reverse the flow through the filter to put the filter in the backwash state;

[0019] Second step: Connect the high-voltage cable and the external power supply. When the power indicator light of the high-voltage pulse generator lights up, turn on the power switch of the high-voltage pulse generator to discharge the filter media and water inside the filter body. The calculation of the regeneration discharge time is as follows:

[0020] t≥

[0021] In the formula: t—the discharge time, min;

[0022] p—the single-pulse discharge energy, J / time;

[0023] f—the discharge frequency, times / min;

[0024] V1—the volume of the filter media, m 3 。

[0025] Third step: After the regeneration treatment is completed, turn off the power switch of the high-voltage pulse generator, cut off the external power supply, close the ball valve, and switch to the normal operation state of the filter body.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] First, in the present invention, the low-frequency plasma pulsed caked filter media regeneration device is connected to the ball valve of the short connection of the filter. The ball valve is opened to fill the space inside the reflection short connection with sewage;

[0028] Second, in the present invention, through the process of the filter, the filter is put in the backwash state;

[0029] Third, in the present invention, after connecting the high-voltage cable and the external power supply and the power indicator light of the high-voltage pulse generator is normal, the power switch of the high-voltage pulse generator is turned on to discharge the filter media and water inside the filter;

[0030] Fourth, in the present invention, after the regeneration treatment is completed, the power switch of the high-voltage pulse generator is turned off, the external power supply is cut off, the ball valve is closed, and the normal operation state of the filter is switched to;

[0031] V. By the combined use of the above structures, the present invention solves the problems in the traditional method, including high cost, certain impact of the medicament on the quality of the treated sewage, corrosion to the filter, and influence on the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structural principle of the present invention;

[0033] Figure 2 It is a schematic diagram of the principle of the reflection joint of the present invention;

[0034] Figure 3 It is a schematic diagram of the reflection short - circuit structure of the present invention;

[0035] Figure 4 It is a schematic diagram of the principle of the plasma discharge electrode of the present invention;

[0036] Figure 5 It is the circuit diagram of the high - voltage pulse generator of the present invention.

[0037] In the figure: 11 - external power supply, 12 - high - voltage pulse generator, 13 - high - voltage cable, 131 - cable threaded joint, 14 - plasma discharge electrode, 141 - cathode discharge head, 142 - cathode discharge bracket, 143 - metal shell, 144 - external thread one, 145 - external thread two, 146 - anode discharge head, 147 - anode column, 20 - reflection short - circuit, 201 - reflection short - circuit body, 202 - reflection short - circuit connection flange, 203 - parabolic reflecting surface, 31 - connection short - circuit, 32 - filter body, 33 - filter media, 34 - filter water outlet, 35 - filter water inlet, 40 - adjusting gasket, 50 - ball valve, D1 - power indicator light, K - switch, D2 - working indicator light, B - step - up transformer, Ct - frequency - modulation capacitor, Z - rectifying circuit, V - voltmeter, R1, R2 - voltage - dividing resistors, Co - pulse energy - storage capacitor, G - constant - voltage discharge tube. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] Please refer to Figures 1 to 5, the present invention provides a technical solution: a low-frequency plasma pulse plate-and-frame filter material regeneration device and its regeneration method, including an external power supply 11, a high-voltage cable 13, and a filter body 32. The left end of the external power supply 11 is electrically connected to a high-voltage pulse generator 12, which mainly consists of a power switch K, a power indicator D1, a working indicator D2, a step-up transformer B, a frequency modulation capacitor Ct, a rectifier circuit Z, voltage-dividing resistors R1 and R2, a DC voltmeter V, a pulse energy storage capacitor Co, a constant-voltage discharge tube G, and a plasma discharge electrode 14.

[0040] The frequency modulation capacitor Ct is connected in series between the high-voltage end of the step-up transformer B and the rectifier circuit Z. The negative pole of the output of the rectifier circuit Z is grounded. A voltage-dividing DC voltmeter V and a pulse energy storage capacitor Co are connected between the positive and negative poles of the output of the rectifier circuit Z. Among them, a constant-voltage discharge tube G is connected in series between the positive pole of the pulse energy storage capacitor Co and the plasma discharge electrode 14; the frequency modulation capacitor Ct uses its impedance to limit the charging speed of the pulse energy storage capacitor Co to achieve the effect of adjusting the discharge frequency; the constant-voltage discharge tube G consists of a pair of discharge electrodes with a specific gap, sealed in an insulating cavity filled with vacuum or inert gas, and can automatically discharge when a certain voltage is reached. In this invention, a constant-voltage discharge switch produced by Bazhou ConocoPhillips Energy Technology Co., Ltd. is selected, and the maximum discharge current can reach one hundred kiloamperes; both ends of the high-voltage cable 13 are fixedly connected with cable threaded joints 131. The right end of the high-voltage cable 13 is electrically fixedly connected to the high-voltage pulse generator 12 through the cable threaded joint 131. The external power supply 11 provides power to the high-voltage pulse generator 12. The cable threaded joint 131 on the left end of the high-voltage cable 13 is screwed with the plasma discharge electrode 14. The plasma discharge electrode 14 includes an insulating sealing material 140, a cathode discharge bracket 142, a metal shell 143, and an anode discharge head 146. The above-mentioned insulating sealing material 140 can be selected as a graphite composite gasket, which is resistant to high temperature, oil, and corrosion, and has a longer service life. The surface of the insulating sealing material 140 is fixedly connected to the inner wall of the metal shell 143. The right end of the cathode discharge bracket 142 is electrically fixedly connected to the left end of the metal shell 143. The surface of the cathode discharge bracket 142 is welded with a cathode discharge head 141. External threads 144 and 145 are respectively opened on the surfaces of the metal shell 143 near the right end and the middle. The metal shell 143 is threadedly connected to the inner wall of the cable threaded joint 131 through the external thread 144, and the metal shell 143 is threadedly connected to the inner wall of the reflection short circuit 20 through the external thread 145. An anode column 147 is fixedly connected to the inner wall of the insulating sealing material 140. The high-voltage pulse generator 12 outputs the positive electricity of the high-voltage pulse through the high-voltage cable 13 to the plasma discharge electrode 14, and is connected to the anode column 147 of the plasma discharge electrode 14 through the inner core of the cable threaded joint 131 of the high-voltage cable 13 to supply power to the anode discharge head 146; the negative electricity of the output high-voltage pulse is connected to the external metal shell 143 of the plasma discharge electrode 14 through the thread of the cable threaded joint 131 of the high-voltage cable 13, and the negative current supplies power to the cathode discharge head 141 through the external shell 143 of the plasma discharge electrode 14 and the cathode discharge bracket 142 at the left end; the distance between the cathode discharge head 141 and the anode discharge head 146 is two to ten millimeters. When the high-voltage pulse generator 12 sends a DC high-voltage pulse to the plasma discharge electrode 14, the sewage between the cathode discharge head 141 and the anode discharge head 146 is broken down to form a plasma. The instantaneous temperature of the plasma is greater than 1500 Kelvin, the instantaneous pressure is greater than 1000 megapascals, and the instantaneous release power is as high as 1.4×10 6-20×10 6 kW; the left end of the anode column 147 is electrically fixed to the anode discharge head 146. The cathode discharge head 141 and the anode discharge head 146 are coaxially concentric. The surface of the plasma discharge electrode 14 is threadedly connected with a reflection short circuit 20. The reflection short circuit 20 includes a reflection short circuit body 201. An internal thread is provided on the inner wall near the right end of the reflection short circuit body 201 and is screwed with an external thread II 145 to realize the fixed connection between the reflection short circuit body 201 and the metal shell 143 through screwing. A reflection short circuit connection flange 202 is fixedly connected to the left end of the reflection short circuit body 201. The left side of the reflection short circuit connection flange 202 is hermetically fixed to the right end of the connection short circuit 31. The reflection short circuit connection flange 202 is a conventional sealing connection mechanism and is used here to realize the fixed connection with the connection short circuit 31. The inside of the reflection short circuit body 201 is a parabolic reflection surface 203 that opens to the left and is coaxial with the plasma discharge electrode 14. The midpoint of the anode discharge head 146 and the cathode discharge head 141 coincides with the focus of the parabolic reflection surface 203 on the reflection short circuit body 201, and the non-coincidence degree is less than 1.5 mm to ensure that the energy formed by the discharge is reflected by the parabolic reflection surface 203 to form a parallel beam acting on the filter material and the water body, preventing the scattering of the pulse wave from reducing the treatment effect. An adjusting gasket 40 is movably connected to the right end of the reflection short circuit body 201. The inner wall of the adjusting gasket 40 is slidably connected to the surface of the metal shell 143. The adjusting gasket 40 is used to adjust the depth of the plasma discharge electrode 14 extending into the reflection short circuit 20. The left end of the reflection short circuit 20 is fixedly connected with a connection short circuit 31. A ball valve 50 is provided on the surface of the connection short circuit 31. The left end of the connection short circuit 31 penetrates through the filter body 32 and is hermetically fixed to the filter body 32. The filter material 33 is installed inside the filter body 32. A filter water outlet 34 and a filter water inlet 35 are respectively opened at the bottom and the top of the filter body 32.

[0041] Working principle: When the low-frequency plasma pulsed caked filter material regeneration device and its regeneration method are in use, the low-frequency plasma pulsed caked filter material regeneration device is connected to the ball valve 50 of the connection short circuit 31 on the filter body 32. The ball valve 50 is opened to fill the space inside the reflection short circuit 20 with sewage;

[0042] Reverse the flow of the filter to put the filter in the backwashing state;

[0043] Second step: Connect the high-voltage cable 13 and the external power supply 11. The power indicator light of the high-voltage pulse generator 12 lights up. Turn on the power switch of the high-voltage pulse generator 12 to perform a discharge operation on the filter material 33 and water inside the filter body 32. The calculation of the regeneration discharge time is as follows:

[0044] t≥ ,

[0045] Where: t—the discharge time, min;

[0046] p—the single-pulse discharge energy, J / time;

[0047] f—the discharge frequency, times / min;

[0048] V1—the volume of the filter media, m 3

[0049] Step 3: After the regeneration treatment is completed, turn off the power switch of the high-voltage pulse generator 12, cut off the external power supply 11, close the ball valve 50, and transfer to the normal operation state of the filter body 32; the discharge frequency of the low-frequency plasma pulse caking filter media regeneration device is generally 10 - 30 times / min. If the frequency is too high, the heating is serious, and if the frequency is too low, the regeneration effect will be reduced; when the single discharge energy of the low-frequency plasma pulse caking filter media regeneration device is 100 - 800 J, when the discharge energy is lower than 100 J, its effect drops very significantly.

[0050] Using an oscilloscope to detect, the discharge time of the low-frequency plasma pulse caking filter media regeneration device each time is only 40 - 70 μS.

[0051] According to the discharge energy calculation formula, design the low-frequency plasma pulse caking filter media regeneration device to ensure that its single discharge energy is 100 - 800 J.

[0052] The electric energy instantaneously released by the low-frequency plasma pulse caking filter media regeneration device can ionize sewage into plasma. The pressure pulse formed instantaneously by the plasma is as high as more than 1000 MPa, and the instantaneous temperature of the plasma is above 1500 K. According to the power formula calculation, the power instantaneously released by the single plasma discharge electrode 14F each time is 1.4×10 6 -20×10 6 kW.

[0053] Under the action of the pressure wave, electromagnetic field, instantaneous high temperature and high pressure, and cavitation effect of the plasma formed by the low-frequency plasma pulse caking filter media regeneration device on the caking filter media, the regeneration efficiency of the caking filter media is greater than 98.6%, and the power consumption of the low-frequency plasma pulse caking filter media regeneration device is only 0.5 - 2.5 kilowatts.

[0054] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Low-frequency plasma pulse agglomerated filter material regeneration device, characterized in that: It includes an external power supply (11), a high-voltage cable (13) and a filter body (32). The left end of the external power supply (11) is electrically connected to a high-voltage pulse generator (12). Both ends of the high-voltage cable (13) are fixedly connected with cable threaded joints (131). The right end of the high-voltage cable (13) is electrically and fixedly connected to the high-voltage pulse generator (12) through the cable threaded joint (131). The cable threaded joint (131) on the left end of the high-voltage cable (13) is screwed with a plasma discharge electrode (14). The surface of the plasma discharge electrode (14) is threadedly connected with a reflection short circuit (20). The left end of the reflection short circuit (20) is fixedly connected with a connection short circuit (31). A ball valve (50) is arranged on the surface of the connection short circuit (31). The left end of the connection short circuit (31) penetrates through the filter body (32) and is hermetically and fixedly connected to the filter body (32). The interior of the filter body (32) is filled with filter media (33). A filter water outlet (34) and a filter water inlet (35) are respectively arranged at the bottom and the top of the filter body (32). The high-voltage pulse generator (12) includes a power switch K, a power indicator D1, a working indicator D2, a step-up transformer B, a frequency modulation capacitor Ct, a rectification circuit Z, voltage-dividing resistors R1 and R2, a DC voltmeter V, a pulse energy storage capacitor Co, and a constant-voltage discharge tube G. The AC power supply AC, the power indicator D1, the power switch K, and the primary coil of the step-up transformer B are sequentially connected to form a loop. The working indicator D2 is connected in parallel with the primary coil of the step-up transformer B. The frequency modulation capacitor Ct is connected in series between the high-voltage end of the step-up transformer B and the rectification circuit Z. The negative electrode of the output of the rectification circuit Z is grounded. The resistor R1 and the resistor R2 are connected in series between the positive and negative electrodes of the output end of the rectification circuit Z. The DC voltmeter V is connected in parallel across the resistor R2. The series branch of the resistor R1 and the resistor R2 is connected in parallel with the pulse energy storage capacitor Co. The plasma discharge electrode (14) and the constant-voltage discharge tube G are connected in series between the two ends of the pulse energy storage capacitor Co. After connecting the high-voltage cable (13) and the external power supply (11), turn on the power switch K of the high-voltage pulse generator (12) to perform a discharge operation on the filter media (33) and water inside the filter body (32). The calculation of the regeneration discharge time is as follows: t≥ , where P is the single-pulse discharge energy, f is the discharge frequency, and V1 is the volume of the filter medium; the discharge frequency is 10 - 30 times per minute, and the single-pulse discharge energy is 100 - 800 joules; According to the discharge energy calculation formula, a low-frequency plasma pulse plate-and-frame filter media regeneration device is designed to ensure that its single discharge energy is 100 - 800 J.

2. The low-frequency plasma pulse agglomerated filter material regeneration device according to claim 1, characterized in that: The plasma discharge electrode (14) includes an insulating sealing material (140), a cathode discharge bracket (142), a metal shell (143), and an anode discharge head (146). The surface of the insulating sealing material (140) is fixedly connected to the inner wall of the metal shell (143). The right end of the cathode discharge bracket (142) is electrically and fixedly connected to the left end of the metal shell (143). A cathode discharge head (141) is welded to the surface of the cathode discharge bracket (142). External threads one (144) and external threads two (145) are respectively provided on the surface of the metal shell (143) near the right end and the middle. The metal shell (143) is threadedly connected to the inner wall of the cable thread joint (131) through the external threads one (144). The metal shell (143) is threadedly connected to the inner wall of the reflection short circuit (20) through the external threads two (145). An anode column (147) is fixedly connected to the inner wall of the insulating sealing material (140). The left end of the anode column (147) is electrically and fixedly connected to the anode discharge head (146). The cathode discharge head (141) and the anode discharge head (146) are coaxial and concentric.

3. The low-frequency plasma pulse agglomerated filter material regeneration device according to claim 2, characterized in that: The reflection short circuit (20) includes a reflection short circuit body (201). An internal thread is provided on the inner wall of the reflection short circuit body (201) near the right end and is screwed to the external threads two (145).

4. The low-frequency plasma pulse agglomerated filter material regeneration device according to claim 3, characterized in that: A reflection short circuit connection flange (202) is fixedly connected to the left end of the reflection short circuit body (201). The left side of the reflection short circuit connection flange (202) is hermetically and fixedly connected to the right end of the connection short circuit (31).

5. The low-frequency plasma pulse agglomerated filter material regeneration device according to claim 3, characterized in that: The inside of the reflection short circuit body (201) is a parabolic reflection surface (203) that opens to the left and is coaxial with the plasma discharge electrode (14). The midpoint of the anode discharge head (146) and the cathode discharge head (141) coincides with the focus of the parabolic reflection surface (203) on the reflection short circuit body (201), and the non - coincidence degree is less than 1.5 mm.

6. The low-frequency plasma pulse agglomerated filter material regeneration device according to claim 3, characterized in that: An adjusting gasket (40) is movably connected to the right end of the reflection short circuit body (201). The inner wall of the adjusting gasket (40) is slidably connected to the surface of the metal shell (143).

7. The usage method of the low-frequency plasma pulse agglomerated filter material regeneration device according to claim 1, comprising the following steps: First step: Connect the low - frequency plasma pulse plate - and - frame filter media regeneration device to the ball valve (50) of the connection short circuit (31) on the filter body (32). Open the ball valve (50) to fill the space inside the reflection short circuit (20) with sewage; backwash the filter to put the filter in the backwash state. Second step: Connect the high - voltage cable (13) and the external power supply (11). The power indicator light of the high - voltage pulse generator (12) lights up. Turn on the power switch of the high - voltage pulse generator (12) to discharge the filter media (33) and water inside the filter body (32). Third step: After the regeneration treatment is completed, turn off the power switch of the high - voltage pulse generator (12), cut off the external power supply (11), close the ball valve (50), and switch to the normal operation state of the filter body (32).

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