CN115259564A - Plasma sewage purification device - Google Patents

Abstract

The invention belongs to the technical field of sewage purification equipment, and provides a plasma sewage purification device which comprises a main box body, wherein a water inlet is formed in one side of the main box body, a water outlet is formed in the other side of the main box body, the main box body internally comprises an aeration treatment chamber, a first water storage chamber, a sewage treatment chamber, a membrane chamber and a clean water tank, an air supplementing fan is arranged on the upper side of the sewage treatment chamber, an air blower is arranged on the bottom wall of the sewage treatment chamber, the output end of the air blower is connected with an air supply pipe, one end of the air supply pipe penetrates through the first water storage chamber and extends into the aeration treatment chamber, and a filtering membrane group is arranged in the membrane chamber. The invention mainly purifies the sewage through the plasma electric field and the ozone aeration without the participation of biological bacteria, solves the problem of difficult strain acclimation and application, and simultaneously saves the application of PAC and PAM medicaments.

Description

Plasma sewage purification device

Technical Field

The invention belongs to the technical field of sewage purification equipment, and particularly relates to a plasma sewage purification device.

Background

Along with the continuous development of society, more and more domestic sewage and production wastewater are continuously discharged into a river channel, so that part of the river channel is seriously polluted, the pollutant carrying capacity of the river channel is limited, when the water pollution exceeds load, the ecological collapse of the water body of the river bed can be caused, the organisms in the river channel are completely eradicated, stink is emitted, the surrounding environment is polluted, the sewage in production and life can be purified by a sewage purification device, the existing sewage treatment mostly adopts a biological method to treat the sewage, but the acclimation of the biological bacteria is difficult, the requirement on living environment is high, the temperature needs to be kept between 15 ℃ and 25 ℃, meanwhile, the pH value, the COD concentration, the total ammonia nitrogen, the total phosphorus, the total sulfur, the sewage toxicity and other conditions are very strict, one condition which is not satisfied is that the purification effect is seriously affected if the condition is light, all the biochemical bacteria die if the condition is heavy, meanwhile, agents such as PAC (polyaluminium chloride), PAM (polyacrylamide) and the like need to be added to achieve a better treatment effect, so that even if the professional sewage treatment operators cannot guarantee the sewage treatment effect is still, and the corresponding laboratory living condition of the water body and the bacteria can be monitored frequently. Therefore, a sewage purification device which is simple to operate, has no selectivity to water, is strong in environmental adaptation and convenient to popularize and apply in the market is urgently needed to be developed. Therefore, a plasma sewage purification device is provided.

Disclosure of Invention

The invention provides a plasma sewage purification device, and aims to thoroughly solve the problems that the existing sewage purification device is difficult in domestication of biological bacteria, high in sewage environment requirement, easy in death of biological bacteria and unstable in effluent quality.

The invention is realized in such a way, the invention provides a plasma sewage purification device, which comprises a main box body, wherein one side of the main box body is provided with a water inlet, the other side of the main box body is provided with a water outlet, the main box body internally comprises an aeration treatment chamber, a first water storage chamber, a sewage treatment chamber, a membrane chamber and a clean water tank, an overflow port is connected between the aeration treatment chamber and the first water storage chamber, an ionization component is arranged in the sewage treatment chamber, an air supplementing fan is arranged on the upper side of the sewage treatment chamber, the bottom wall of the sewage treatment chamber is provided with an air blower, the output end of the air blower is connected with an air supply pipe, an adjusting valve is arranged on the air supply pipe, one end of the air supply pipe penetrates through the first water storage chamber and extends into the aeration treatment chamber, a filter membrane group is arranged in the membrane chamber and is connected with the input end of a second water delivery device, and the output end of the second water delivery device is connected with the clean water tank.

Optionally, the first water storage chamber is communicated with a drug adding pipe, and the drug adding pipe is used for adding a drug for adjusting the PH value of the sewage.

Optionally, still include the second water storage chamber, the second water storage chamber is located the sewage treatment room with between the membrane room, the inside of second water storage chamber is equipped with first water delivery device, the inside intercommunication of second water storage chamber has phosphorus removal agent to add the pipe, the diapire of second water storage chamber is equipped with the mud discharge port.

Optionally, the first water delivery device comprises a pump, a water feeding pipe, an upper limiter and a lower limiter, the pump is installed on the bottom wall of the second water storage chamber, one end of the water feeding pipe is connected with the output end of the pump, the upper limiter and the lower limiter are installed inside the second water storage chamber respectively, the upper limiter is used for controlling the starting of the pump, and the lower limiter is used for controlling the stopping of the pump.

Optionally, the overflow port is close to the upper side of the aeration treatment chamber.

Optionally, the ionization subassembly includes positive plate, negative plate and insulator, the negative plate install in between the left and right sides wall of sewage treatment room, the both ends of negative plate are passed respectively the sewage treatment room just the negative plate lean on to first water storage chamber one side tilt up, the sewage treatment room lean on to a lateral wall of first water storage chamber has seted up the water inlet, the delivery port has been seted up to another lateral wall of sewage treatment room, the water inlet with the delivery port respectively with the both ends of negative plate correspond, be equipped with the guiding gutter on the negative plate, the insulator is located the both sides of positive plate, the positive plate is located the upside of negative plate.

Optionally, the second water delivery device includes self priming pump, input tube and output tube, the one end of input tube stretches into the inside of filter membrane group, the other end of input tube with the connection of the input of self priming pump, the output of self priming pump with the one end of output tube is connected, the other end of output tube stretches into the inside of clean water basin, the inside of clean water basin is equipped with disinfectant and adds the pipe.

Optionally, the air supply pipe is a three-way pipe, the other end of the three-way pipe penetrates through the second water storage chamber and extends into the membrane chamber, an aeration disc is arranged on the air supply pipe in the aeration treatment chamber, and an aeration disc is also arranged on the air supply pipe in the membrane chamber.

Optionally, the filtration membrane group includes filtration membrane and filtration membrane frame, filtration membrane is the MBR membrane, filtration membrane has a plurality ofly, filtration membrane install in the filtration membrane frame.

Optionally, the filter membrane module further comprises a backwashing device, wherein the backwashing device comprises a backwashing pump, a first backwashing pipe and a second backwashing pipe, one end of the first backwashing pipe extends into the filter membrane module, the other end of the first backwashing pipe is connected with the output end of the backwashing pump, one end of the second backwashing pipe is connected with the input end of the backwashing pump, and the other end of the second backwashing pipe extends into the clean water tank.

The invention achieves the following beneficial effects:

(1) Plasma sewage purification device is through carrying out ozone aeration to sewage and handling, tentatively decomposes the organic matter in the waste water, utilizes the indiscriminate decomposition of plasma field to decompose the organic matter in the sewage once more simultaneously to realized the thorough purification to sewage, improved the utilization ratio of water resource. Solves the problems of unstable water outlet, poor purification effect, difficult flora domestication application and unsatisfactory treatment effect of the existing sewage purification device, which is mostly used for treating sewage by a biological method.

(2) The plasma sewage purification device does not need manual operation in the using process, carries out full-automatic sewage purification treatment, and greatly saves labor expenditure.

(3) The plasma sewage purification device purifies sewage through a plasma electric field and ozone aeration without participation of biological bacteria, solves the problem of difficult application of strain domestication, and simultaneously omits the application of PAC and PAM medicaments.

(4) The plasma sewage purification device can normally operate sewage at the temperature of 1-95 ℃ in the sewage treatment process, almost has no requirement on the sewage environment temperature, and has higher practicability compared with the sewage temperature required by a biological method which needs to be kept at 15-25 ℃.

Drawings

FIG. 1 is a schematic sectional view of a plasma sewage purification apparatus provided in the present invention;

FIG. 2 is a schematic top sectional view of a sewage treatment chamber of a plasma sewage purification apparatus provided by the present invention;

FIG. 3 is a schematic structural view of a negative plate of the plasma sewage purification apparatus provided by the present invention;

FIG. 4 is an enlarged schematic view at A in FIG. 1;

fig. 5 is an enlarged schematic view of B in fig. 1.

In the figure: 1-main box body, 101-water inlet pipe joint, 102-water outlet pipe joint, 103-aeration treatment chamber, 104-first water storage chamber, 105-sewage treatment chamber, 106-second water storage chamber, 107-membrane chamber, 108-overflow port, 109-water inlet, 110-water outlet, 111-clean water tank, 112-sludge discharge port, 2-ionization component, 201-positive plate, 202-negative plate, 203-insulator, 204-water chute, 3-air make-up fan, 4-blower, 5-blast pipe, 6-aeration disc, 7-first water delivery device, 701-pump machine, 702-water supply pipe, 703-upper limiter, 704-lower limiter, 8-filter membrane group, 801-filter membrane, 802-filter membrane frame, 9-second water delivery device, 9-self-priming pump, 902-input pipe, 903-output pipe, 10-drug addition pipe, 11-dephosphorization agent addition pipe, 12-disinfectant addition pipe, 13-backwashing device, 1302-pump, 1303-first backwashing pipe, 1303-second backwashing pipe, 14-backwashing valve and backwashing pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

According to the invention, the plasma sewage purification device is used for carrying out ozone aeration treatment on the sewage to preliminarily decompose organic matters in the sewage, and simultaneously, the plasma field is utilized for undifferentiated decomposition to decompose the organic matters in the sewage again, so that the thorough purification of the sewage is realized, and the utilization rate of water resources is improved. Solves the problems of unstable water outlet, poor purification effect, difficult flora domestication application and unsatisfactory treatment effect of the existing sewage purification device, which is mostly used for treating sewage by a biological method.

The invention is realized in such a way, the invention provides a plasma sewage purification device, which comprises a main box body 1, wherein one side of the main box body 1 is provided with a water inlet pipe joint 101, the other side of the main box body 1 is provided with a water outlet pipe joint 102, the interior of the main box body 1 comprises an aeration treatment chamber 103, a first water storage chamber 104, a sewage treatment chamber 105, a membrane chamber 107 and a clean water tank 111, an overflow port 108 is connected between the aeration treatment chamber 103 and the first water storage chamber 104, an ionization component 2 is arranged in the sewage treatment chamber 105, an air supplementing fan 3 is arranged on the upper side of the sewage treatment chamber 105, the bottom wall of the sewage treatment chamber 105 is provided with an air blower 4, the output end of the air blower 4 is connected with an air supply pipe 5, the air supply pipe 5 is provided with an adjusting valve 14, one end of the air supply pipe 5 penetrates through the first water storage chamber 104 and extends into the aeration treatment chamber 103, a filtering membrane chamber 107 is internally provided with a filtering membrane group 8, the filtering membrane group 8 is connected with the input end of a second water delivery device 9, and the output end of the second water delivery device 9 is connected with the clean water tank 111. In the in-service use process, let in this equipment with sewage by water inlet pipe joint 101, sewage gets into aeration treatment room 103, the work of tonifying wind fan 3, carry outside air to sewage treatment room 105, oxygen among the outside air takes place the molecular change through ionization subassembly 2, convert into ozone by oxygen, ozone is let in aeration treatment room 103 through blast pipe 5 by air-blower 4, carry out aeration treatment to sewage, oxygen in the air is to the transfer in the liquid with higher speed, prevent that the suspended object from sinking in the pond, strengthen organic matter and microorganism and dissolved oxygen's contact in the pond, organic matter carries out oxidative decomposition in the sewage. With the rising of the water level inside the aeration treatment chamber 103, finally the water inside the aeration treatment chamber 103 enters the first water storage chamber 104 from the overflow port 108, then enters the membrane chamber 107 through the ionization component 2, and then the sewage is sucked into the interior of the filtration membrane group 8 from the outside through the second water delivery device 9, and the sewage is purified and filtered through the filtration membrane group 8, and then is delivered to the clean water tank 111 through the output pipe 903, and the clean water tank 111 obtains purified clean water and finally is discharged through the water outlet pipe joint 102. Realizes the purification treatment of the sewage.

As an example, a drug adding pipe 10 is communicated with the interior of the first water storage chamber 104, and the drug adding pipe 10 is used for adding a drug for adjusting the PH value of the sewage. The drug adding pipe 10 is used for adding and adjusting the PH of the water inside the first reservoir chamber 104. When the alkalinity of the wastewater is too strong, acidic chemicals can be added to the interior of first reservoir 104, and when the acidity of the wastewater is too strong, acidic chemicals can be added to the interior of first reservoir 104 to adjust the PH of the wastewater.

As an example, the sewage treatment device further comprises a second water storage chamber 106, wherein the second water storage chamber 106 is arranged between the sewage treatment chamber 105 and the membrane chamber 107, a first water conveying device 7 is arranged inside the second water storage chamber 106, sewage enters the second water storage chamber 106 through the ionization assembly 2, a phosphorus removing agent adding pipe 11 is communicated inside the second water storage chamber 106, and a sludge discharge port 112 is arranged on the bottom wall of the second water storage chamber 106. The sludge discharge port 112 is used to discharge the sludge. The phosphorus removal agent is added to the inside of the second reservoir chamber 106 through the phosphorus removal agent addition pipe 112, and the phosphorus removal treatment is performed on the inside water of the second reservoir chamber 106. After the phosphorous removal agent is added, sediment is generated inside the second water storage chamber 106, the sediment is in a sludge shape, and the sediment is discharged from the sludge discharge port 112. After the water inside the second reservoir chamber 106 is dephosphorized, the water is transported to the membrane chamber 107 by the first transporting device.

As an example, the first water delivery device 7 includes a pump 701, a water feeding pipe 702, an upper stopper 703 and a lower stopper 704, the pump 701 is installed on the bottom wall of the second reservoir 106, a pump bracket (not shown) is further connected between the pump 701 and the bottom wall of the second reservoir 106, the pump 701 is supported away from the bottom wall of the second reservoir 106, so as to prevent sludge at the bottom of the second reservoir 106 from affecting the normal use effect of the pump 701, one end of the water feeding pipe 702 is connected to the output end of the pump 701, the upper stopper 703 and the lower stopper 704 are respectively installed inside the second reservoir 106, the upper stopper 703 is used for controlling the start of the pump 701, and the lower stopper 704 is used for controlling the stop of the pump 701. Since sludge is generated after phosphorus removal in second reservoir 106, the start and stop of pump 701 is controlled by the arrangement of upper stopper 703 and lower stopper 704, pump 701 is started to deliver water from upper pipe 702 to membrane chamber 107 when the water level is higher than upper stopper 703, pump 701 is stopped when the water level is lower than lower stopper 703, and lower stopper 703 is higher than the sediment deposition height.

Illustratively, the overflow port 108 is located above the aeration chamber 103. The overflow port 108 is disposed on the upper side of the aeration chamber 103, so as to ensure that the water inside the aeration chamber 103 fully reacts with the ozone, purify the sewage by the ozone, and ensure the purification effect of the sewage.

As an example, the ionization module 2 includes a positive plate 201, a negative plate 202, and an insulator 203, the negative plate 202 is installed between the left and right sidewalls of the sewage treatment chamber 105, both ends of the negative plate 202 respectively pass through the sewage treatment chamber 105, the negative plate 202 inclines upward toward the first water storage chamber 104, the sewage treatment chamber 105 has a water inlet 109 opened toward one sidewall of the first water storage chamber 104, the other sidewall of the sewage treatment chamber 105 has a water outlet 110 opened, the water inlet 109 and the water outlet 110 correspond to both ends of the negative plate 202, the negative plate 202 is provided with a water chute 204, the insulator 203 is provided on both sides of the positive plate 201, and the positive plate 201 is provided on the upper side of the negative plate 202.

As an example, the second water delivery device 9 includes a self-priming pump 901, an input pipe 902 and an output pipe 903, wherein one end of the input pipe 902 extends into the inside of the filter membrane group 8, the other end of the input pipe 901 is connected to the input of the self-priming pump 901, the output end of the self-priming pump 901 is connected to one end of the output pipe 903, and the other end of the output pipe 903 extends into the inside of the clean water tank 111. The sewage is sucked into the filtering membrane group 8 from the outside through the self-sucking pump 901, purified and filtered through the filtering membrane group 8, then conveyed to the clean water tank 111 through the output pipe 903, and the clean water tank 111 obtains purified clean water. The inside of the clean water tank 111 is provided with a disinfectant addition pipe 12. Disinfectant is added into the clean water tank 111 through the disinfectant adding pipe 12, so that the clean water is further sterilized and purified, and the sewage is ensured to be thoroughly purified.

The air supply pipe 5 is a three-way pipe, the other end of the three-way pipe penetrates through the second water storage chamber 106 and extends into the membrane chamber 107, an aeration disc 6 is arranged on the air supply pipe 5 in the aeration treatment chamber 103, and the aeration disc 6 is also arranged on the air supply pipe 5 of the membrane chamber 107. The setting of aeration dish 6 is convenient for carry ozone to the aeration treatment room 103 in and is diffused, improves the reaction efficiency of ozone and sewage, improves the purifying effect to sewage. After the sewage enters the membrane chamber 107, primary aeration treatment is carried out to further purify the sewage.

As an example, the filtering membrane group 8 includes a filtering membrane 801 and a filtering membrane frame 802, the filtering membrane 801 is an MBR membrane, which is a new sewage treatment apparatus that separates an ultrafiltration membrane and a hollow fiber membrane and is closely combined with a membrane bioreactor in sewage treatment, the filtering membrane 801 has a plurality of filtering membranes, and the filtering membrane 801 is installed in the filtering membrane frame 802. Sewage passes filtration membrane group 8's filtration membrane 801, and filtration membrane 801 filters purification to sewage, compares traditional ordinary filter screen, and MBR membrane's filtration is more thorough, and is better to the purifying effect of sewage.

As an example, the backwashing device further comprises a backwashing device 13, wherein the backwashing device 13 comprises a backwashing pump 1301, a first backwashing pipe 1302 and a second backwashing pipe 1303, one end of the first backwashing pipe 1302 extends into the filtering membrane group 8, the other end of the first backwashing pipe 1302 is connected with the output end of the backwashing pump 1301, one end of the second backwashing pipe 1303 is connected with the input end of the backwashing pump 1301, and the other end of the second backwashing pipe 1303 extends into the clean water tank 111. In practical use, the backwash pump 1301 sucks clean water in the clean water tank 111 into the inside of the filter membrane module through the second but custom 1303, then the clean water is conveyed into the filter membrane module 8 through the first backwash pipe 1302, and the clean water permeates from the inside to the outside of the filter membrane module 8, so that the filter membrane module 8 is cleaned. Need not artifical manual dismantlement clearance to filter membrane group 8, practice thrift the manpower, maintenance and the maintenance in the later stage use of being convenient for, the practicality is strong. The service life of the MBR membrane is effectively prolonged.

Principle of operation

In the in-service use process, let in this equipment with sewage by water inlet pipe joint 101, sewage gets into aeration treatment room 103, and air supplement fan 3 works, carries outside air to sewage treatment room 105, and the oxygen in the outside air takes place the molecular change through ionization subassembly 2, is converted into ozone by oxygen, and ozone is let in aeration treatment room 103 through blast pipe 5 by air-blower 4, carries out ozone aeration treatment to sewage, utilizes the advanced oxidation method of ozone to carry out oxidative decomposition to organic matter in the sewage. As the water level in aeration chamber 103 rises, the water in aeration chamber 103 finally enters first water storage chamber 104 through overflow port 108, and then the sewage enters second water storage chamber 106 after being further decomposed and treated by ionization component 2. The internal water of second reservoir chamber 106 is phosphorus removed. After the phosphorous removal agent is added, sediment is generated inside the second water storage chamber 106, the sediment is in a sludge shape, and the sediment is discharged from the sludge discharge port 112. After the water inside the second reservoir chamber 106 is dephosphorized, the water is transported to the membrane chamber 107 by the first transporting device. Then, sewage is sucked into the second water delivery device 9 from the outside of the filter membrane group 8, purified and filtered by the filter membrane group 8, and then delivered to the clean water tank 111 through the output pipe 903, and the clean water tank 111 obtains purified clean water and finally is discharged through the water outlet pipe joint 102. Realizes the purification treatment of the sewage.

The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (10)

1. Plasma sewage purification device, its characterized in that, including the main tank body (1), one side of the main tank body (1) is equipped with water inlet pipe connector (101), the opposite side of the main tank body (1) is equipped with outlet pipe connector (102), the inside of the main tank body (1) includes aeration treatment room (103), first water storage room (104), sewage treatment room (105), membrane chamber (107) and clean water basin (111), be connected with overflow mouth (108) between aeration treatment room (103) and first water storage room (104), the inside of sewage treatment room (105) is equipped with ionization subassembly (2), the upside of sewage treatment room (105) is equipped with air supply fan (3), the diapire of sewage treatment room (105) is equipped with air-blower (4), the output of air-blower (4) is connected with blast pipe (5), be equipped with governing valve (14) on blast pipe (5), the one end of ventilation pipe (5) is passed first water storage room (104) stretches into in treatment room (103), the inside of membrane chamber (107) is equipped with filtration membrane group (8), filtration membrane group (8) second water output is connected with the output of second water delivery device (9), aeration device (111) is connected with the output.

2. The plasma sewage purification device according to claim 1, wherein the first reservoir chamber (104) is internally communicated with a drug adding pipe (10), and the drug adding pipe (10) is used for adding a drug for adjusting the PH value of the sewage.

3. The plasma sewage purification device according to claim 1, further comprising a second water storage chamber (106), wherein the second water storage chamber (106) is arranged between the sewage treatment chamber (105) and the membrane chamber (107), a first water delivery device (7) is arranged inside the second water storage chamber (106), a phosphorus removing agent adding pipe (11) is communicated with the inside of the second water storage chamber (106), and a sludge discharge port (112) is arranged on the bottom wall of the second water storage chamber (106).

4. The plasma sewage purification device according to claim 3, wherein the air supply pipe (5) is a three-way pipe, the other end of the three-way pipe passes through the second water storage chamber (106) and extends into the membrane chamber (107), an aeration disc (6) is arranged on the air supply pipe (5) in the aeration treatment chamber (103), and the air supply pipe (5) of the membrane chamber (107) is also provided with the aeration disc (6).

5. The plasma sewage purification apparatus according to claim 3, wherein the first water delivery device (7) comprises a pump (701), a water supply pipe (702), an upper stopper (703) and a lower stopper (704), the pump (701) is installed on the bottom wall of the second water storage chamber (106), one end of the water supply pipe (702) is connected with the output end of the pump (701), the upper stopper (703) and the lower stopper (704) are respectively installed inside the second water storage chamber (106), the upper stopper (703) is used for controlling the start of the pump (701), and the lower stopper (704) is used for controlling the stop of the pump (701).

6. The plasma sewage purification apparatus according to claim 1, wherein said overflow port (108) is located close to an upper side of said aeration treatment chamber (103).

7. The plasma sewage purification apparatus according to claim 1, wherein the ionization element (2) comprises a positive electrode plate (201), a negative electrode plate (202), and an insulator (203), the negative electrode plate (202) is installed between the left and right side walls of the sewage treatment chamber (105), two ends of the negative electrode plate (202) respectively pass through the sewage treatment chamber (105), the negative electrode plate (202) leans to the first water storage chamber (104) side to incline upwards, the sewage treatment chamber (105) leans to one side wall of the first water storage chamber (104) to open a water inlet (109), the other side wall of the sewage treatment chamber (105) to open a water outlet (110), the water inlet (109) and the water outlet (110) respectively correspond to two ends of the negative electrode plate (202), a water guide groove (204) is provided on the negative electrode plate (202), the insulator (203) is provided on two sides of the positive electrode plate (201), and the negative electrode plate (201) is provided on the upper side of the negative electrode plate (202).

8. The plasma sewage purification device according to claim 1, wherein the second water delivery device (9) comprises a self-priming pump (901), an input pipe (902) and an output pipe (903), wherein one end of the input pipe (902) extends into the inside of the filter membrane module (8), the other end of the input pipe (901) is connected with the input of the self-priming pump (901), the output end of the self-priming pump (901) is connected with one end of the output pipe (903), the other end of the output pipe (903) extends into the inside of the clean water basin (111), and the inside of the clean water basin (111) is provided with a disinfectant adding pipe (12).

9. The plasma sewage purification apparatus according to claim 1, wherein the filtration membrane group (8) comprises a filtration membrane (801) and a filtration membrane frame (802), the filtration membrane (801) is an MBR membrane, the filtration membrane (801) has a plurality of filtration membranes, and the filtration membrane (801) is installed in the filtration membrane frame (802).

10. The plasma sewage purification device according to claim 1, further comprising a backwashing device (13), wherein the backwashing device (13) comprises a backwashing pump (1301), a first backwashing pipe (1302) and a second backwashing pipe (1303), one end of the first backwashing pipe (1302) extends into the inside of the filter membrane group (8), the other end of the first backwashing pipe (1302) is connected with an output end of the backwashing pump (1301), one end of the second backwashing pipe (1303) is connected with an input end of the backwashing pump (1301), and the other end of the second backwashing pipe (1303) extends into the inside of the clean water tank (111).

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