Reverse osmosis membrane sewage treatment device and sewage treatment method

Abstract

The invention relates to the technical field of sewage treatment, in particular to a reverse osmosis membrane sewage treatment device and a sewage treatment method. The device comprises a water inlet tank, a treatment tank, a water outlet tank and a driving tank, a driving part is arranged on the driving box; two groups of sewage treatment components are arranged in the treatment box and are divided into a sewage treatment chamber I, a sewage treatment chamber II and a sewage treatment chamber III; piston plates are arranged in the sewage treatment chamber I, the sewage treatment chamber II and the sewage treatment chamber III; and the three groups of piston plates are driven by a driving piece to realize alternate lifting. A plurality of groups of sewage treatment assemblies are arranged, and the reverse osmosis membrane area and the sealing area are opposite to / staggered with the through holes along with rotation of the treatment plate, so that sewage filtering process control is realized. Meanwhile, a piston plate is matched for alternately adjusting the pressure, so that the reverse osmosis speed is increased. And multi-time and graded reverse osmosis purification is realized. The whole sewage treatment process is coherent, various in mode, high in automation and high in efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a reverse osmosis membrane sewage treatment device and a sewage treatment method. Background Art

[0002] The reverse osmosis membrane sewage treatment device is a device that uses a reverse osmosis filtration membrane to purify sewage. It uses pressure difference as the driving force to separate the solvent from the solution. The membrane applies pressure to the liquid on one side of the membrane when it is working. When the pressure exceeds its osmotic pressure, the solvent will reversely permeate in the opposite direction of natural osmosis, thereby obtaining the permeated solvent, i.e., the permeate, on the low-pressure side of the membrane, and obtaining a concentrated solution, i.e., the concentrate, on the high-pressure side.

[0003] Existing reverse osmosis membrane sewage treatment devices use a unified pressurization method to accelerate the effect of reverse osmosis. When multiple reverse osmosis membranes work together, it is easy to cause certain interference, resulting in unstable osmosis efficiency, insufficient continuity and automation of the filtration process, and affecting the efficiency of sewage treatment. Summary of the invention

[0004] In view of the problems existing in the background technology, a reverse osmosis membrane sewage treatment device and a sewage treatment method are proposed. The present invention sets multiple groups of sewage treatment components, and the reverse osmosis membrane area and the sealing area are opposite / interlaced with the through hole as the treatment plate rotates, so as to realize the sewage filtering process control. At the same time, the piston plate is coordinated to perform pressure alternating adjustment to accelerate the speed of reverse osmosis. Multiple and graded reverse osmosis purification is realized. The entire sewage treatment process is coherent, the methods are diverse, the automation is strong, and the efficiency is high.

[0005] The present invention proposes a reverse osmosis membrane sewage treatment device, comprising an inlet box, a treatment box, an outlet box and a drive box; the inlet box and the treatment box are connected through a one-way valve; the treatment box and the outlet box are connected through a two-way valve; the drive box is arranged on the treatment box, and a drive member is arranged inside; two groups of sewage treatment components are arranged in the treatment box, and are divided into sewage treatment chamber 1, sewage treatment chamber 2 and sewage treatment chamber 3 by the treatment box; the sewage treatment chamber 1, sewage treatment chamber 2 and sewage treatment chamber 3 are all provided with piston plates, and the three groups of piston plates are lifted and lowered by the drive member, wherein the piston plates on both sides are lifted and lowered synchronously and in the opposite direction to the piston plate in the middle. The sewage treatment component comprises a mounting plate, a treatment plate and a motor 1; the mounting plate is arranged in the treatment box, intercepts sewage, cleans the treatment plate, a motor 1 is arranged in the center, and a through hole is arranged on the periphery; the treatment plate is driven by the motor 1, and is rotatably arranged on the side of the mounting plate facing the outlet box, and a reverse osmosis membrane area and a sealing area are arranged on the periphery; the reverse osmosis membrane area and the sealing area are opposite / interlaced with the through hole as the treatment plate rotates, and cover it.

[0006] Preferably, a mounting groove is provided on the mounting plate; and the processing plate is rotatably disposed in the mounting groove.

[0007] Preferably, the through hole is arranged below the mounting groove.

[0008] Preferably, an ultrasonic cleaning area is provided above the mounting groove.

[0009] Preferably, the driving member includes motor 2, a rotating shaft and an eccentric wheel; the rotating shaft is driven by motor 2, is horizontally positioned, and is rotatably arranged in a driving box; three groups of eccentric wheels are arranged, the lower ends of which correspond to the piston plates one by one and are slidably connected, and the upper ends are sequentially sleeved on the rotating shaft, and the middle eccentric wheel and the convex ends of the eccentric wheels on both sides are always in opposite directions.

[0010] Preferably, the one-way valve 1 and the one-way valve 2 are located opposite to the through hole.

[0011] Preferably, a filter plate is arranged in the water inlet box; a water inlet is arranged above the filter plate, and a one-way valve is arranged below the filter plate.

[0012] Preferably, a mud collecting box is provided at the bottom of the water inlet tank; the mud collecting box is located below the one-way valve.

[0013] Preferably, a water quality detector is provided in the water outlet tank.

[0014] The present invention further proposes a sewage treatment method of the above reverse osmosis membrane sewage treatment device, the steps are as follows:

[0015] S1. The sewage first enters the water inlet tank, is filtered through the filter plate, and then the precipitant is added and mixed thoroughly and then left to stand;

[0016] S2, after the sedimentation is complete, the driving part starts, and the eccentric wheel is driven to rotate by the motor 2, the first and third groups of piston plates move up, and the second group of piston plates moves down; at this time, the sealing area of ​​the first group of sewage treatment components is opposite to the through hole; the reverse osmosis membrane area of ​​the second sewage treatment component is opposite to the through hole; the sewage enters the sewage treatment chamber 1 from the one-way valve 1, and the sewage in the sewage treatment chamber 2 enters the sewage treatment chamber 3 through the reverse osmosis membrane;

[0017] S3, the first and third groups of piston plates move downward, the second group of piston plates move upward, and the treatment plates rotate. At this time, the sealing area of ​​the second group of sewage treatment components is opposite to the through hole; the reverse osmosis membrane area of ​​the first sewage treatment component is opposite to the through hole; the sewage enters the sewage treatment chamber 2 from the sewage treatment chamber 1 through the reverse osmosis membrane, and the purified sewage in the sewage treatment chamber 3 enters the water outlet tank;

[0018] S4, repeat the above operation, treat the sewage in the water inlet tank in turn, transfer it to the water outlet tank, and regularly start the ultrasonic cleaning area to descale and dredge the reverse osmosis membrane during the purification process;

[0019] S5. The water in the water outlet tank is discharged after being tested and found to be qualified.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] 1. The present invention sets an inlet tank, a treatment tank and an outlet tank which are connected in sequence, and the inlet tank performs preliminary filtration and sedimentation treatment on the sewage. The treatment tank is provided with multiple groups of sewage treatment components, and the reverse osmosis membrane area and the sealing area thereon are relative / interlaced with the through holes on the mounting plate as the treatment plate rotates, so as to realize the control of the sewage filtration process. At the same time, the piston plate is cooperated to alternately adjust the pressure of sewage treatment chamber 1, sewage treatment chamber 2 and sewage treatment chamber 3 to accelerate the speed of reverse osmosis. Multiple and graded reverse osmosis purification is realized to intercept pollution and impurity components, and finally the outlet tank detects the water quality after purification. The entire sewage treatment process is coherent, with various methods, strong automation and high efficiency.

[0022] Second, the present invention sets up an ultrasonic cleaning area, and utilizes the cavitation effect, acceleration effect and straight flow effect of ultrasonic waves in the liquid to directly and indirectly act on the reverse osmosis membrane, so that the dirt layer is dispersed, emulsified and peeled off to achieve the purpose of cleaning, making the reverse osmosis performance of the reverse osmosis membrane stable and lasting. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0025] Figure 3 A schematic diagram of the split structure of the installation plate and the processing plate in one embodiment of the present invention;

[0026] Figure 4 It is a rear view of a mounting plate in one embodiment of the present invention.

[0027] Figure numerals: 1. water inlet tank; 2. water outlet tank; 3. sewage treatment chamber one; 4. sewage treatment chamber two; 5. sewage treatment chamber three; 6. one-way valve one; 7. one-way valve two; 8. sewage treatment component; 9. drive box; 10. motor two; 11. rotating shaft; 12. eccentric wheel; 13. piston plate; 14. filter plate; 15. mud collecting box; 16. mounting plate; 17. treatment plate; 18. motor one; 19. through hole; 20. reverse osmosis membrane area; 21. sealing area; 22. ultrasonic cleaning area. DETAILED DESCRIPTION

[0028] Embodiment 1

[0029] like Figure 1-3As shown, a reverse osmosis membrane sewage treatment device proposed by the present invention comprises an inlet box 1, a treatment box, an outlet box 2 and a drive box 9; the inlet box 1 and the treatment box are connected via a one-way valve 6; the treatment box and the outlet box 2 are connected via a one-way valve 7; the drive box 9 is arranged on the treatment box, and a driving member is arranged inside; two groups of sewage treatment components 8 are arranged in the treatment box, and are divided into a sewage treatment chamber 1 3, a sewage treatment chamber 2 4 and a sewage treatment chamber 3 5; piston plates 13 are arranged in the sewage treatment chamber 1 3, the sewage treatment chamber 2 4 and the sewage treatment chamber 3 5, and the three groups of piston plates 13 are lifted and lowered by the driving member, wherein the piston plates 13 on both sides are lifted and lowered synchronously, and in the opposite direction to the middle piston plate 13. The sewage treatment component 8 includes a mounting plate 16, a treatment plate 17 and a motor 18; the mounting plate 16 is arranged in the treatment box to intercept sewage and clean the treatment plate 17, a motor 18 is arranged in the center, and a through hole 19 is arranged on the periphery; the treatment plate 17 is driven by the motor 18 and is rotatably arranged on the side of the mounting plate 16 facing the water outlet box 2, and a reverse osmosis membrane area 20 and a sealing area 21 are arranged on the periphery; the reverse osmosis membrane area 20 and the sealing area 21 are opposite to / interlaced with the through hole 19 as the treatment plate 17 rotates, and cover it.

[0030] It should be further explained that the driving part includes a motor 10, a rotating shaft 11 and an eccentric wheel 12; the rotating shaft 11 is driven by the motor 10, is horizontally positioned, and is rotatably arranged in the driving box 9; three groups of eccentric wheels 12 are arranged, the lower ends of which correspond to the piston plates 13 one by one, are slidably connected, and the upper ends are sequentially sleeved on the rotating shaft 11, and the convex ends of the middle eccentric wheel 12 and the eccentric wheels 12 on both sides are always in opposite directions. The rotating shaft 11 is driven to rotate by the motor 10, and the three groups of eccentric wheels 12 rotate synchronously, pushing the piston plates 13 to rise and fall alternately, thereby controlling the movement of sewage.

[0031] In this embodiment, an inlet tank 1, a treatment tank and an outlet tank 2 are connected in sequence. The inlet tank 1 performs preliminary treatment on the sewage, and the treatment tank is provided with multiple groups of sewage treatment components 8, wherein the reverse osmosis membrane area 20 and the sealing area 21 on the sewage treatment component 8 are opposite / interlaced with the through hole 19 on the mounting plate 16 as the treatment plate 17 rotates, so as to realize the control of the sewage filtering process. At the same time, the piston plate 13 is coordinated to alternately adjust the pressure of the sewage treatment chamber 1 3, the sewage treatment chamber 2 4 and the sewage treatment chamber 3 5 to accelerate the speed of reverse osmosis. Multiple and graded reverse osmosis purification is realized to intercept pollution and impurity components, and finally the outlet tank 2 performs final treatment on the purified water. The entire sewage treatment process is coherent, with various methods, strong automation and high efficiency.

[0032] Embodiment 2

[0033] like Figure 1-3As shown, a reverse osmosis membrane sewage treatment device proposed by the present invention comprises an inlet box 1, a treatment box, an outlet box 2 and a drive box 9; the inlet box 1 and the treatment box are connected via a one-way valve 6; the treatment box and the outlet box 2 are connected via a one-way valve 7; the drive box 9 is arranged on the treatment box, and a driving member is arranged inside; two groups of sewage treatment components 8 are arranged in the treatment box, and are divided into a sewage treatment chamber 1 3, a sewage treatment chamber 2 4 and a sewage treatment chamber 3 5; piston plates 13 are arranged in the sewage treatment chamber 1 3, the sewage treatment chamber 2 4 and the sewage treatment chamber 3 5, and the three groups of piston plates 13 are lifted and lowered by the driving member, wherein the piston plates 13 on both sides are lifted and lowered synchronously, and in the opposite direction to the middle piston plate 13. The sewage treatment component 8 includes a mounting plate 16, a treatment plate 17 and a motor 18; the mounting plate 16 is arranged in the treatment box to intercept sewage and clean the treatment plate 17, a motor 18 is arranged in the center, and a through hole 19 is arranged on the periphery; the treatment plate 17 is driven by the motor 18 and is rotatably arranged on the side of the mounting plate 16 facing the water outlet box 2, and a reverse osmosis membrane area 20 and a sealing area 21 are arranged on the periphery; the reverse osmosis membrane area 20 and the sealing area 21 are opposite to / interlaced with the through hole 19 as the treatment plate 17 rotates, and cover it.

[0034] It should be further explained that the driving part includes a motor 10, a rotating shaft 11 and an eccentric wheel 12; the rotating shaft 11 is driven by the motor 10, is horizontally positioned, and is rotatably arranged in the driving box 9; three groups of eccentric wheels 12 are arranged, the lower ends of which correspond to the piston plates 13 one by one, are slidably connected, and the upper ends are sequentially sleeved on the rotating shaft 11, and the convex ends of the middle eccentric wheel 12 and the eccentric wheels 12 on both sides are always in opposite directions. The rotating shaft 11 is driven to rotate by the motor 10, and the three groups of eccentric wheels 12 rotate synchronously, pushing the piston plates 13 to rise and fall alternately, thereby controlling the movement of sewage.

[0035] like Figure 4 As shown, a mounting groove is provided on the mounting plate 16; the processing plate 17 is rotatably arranged in the mounting groove. An ultrasonic cleaning area 22 is arranged above the mounting groove. The ultrasonic cleaning area 22 utilizes the cavitation effect, acceleration effect and straight flow effect of ultrasonic waves in the liquid to directly and indirectly act on the reverse osmosis membrane, so that the dirt layer is dispersed, emulsified and peeled off to achieve the purpose of cleaning. This makes the reverse osmosis performance of the reverse osmosis membrane stable and durable.

[0036] It should be further explained that the through hole 19 is arranged below the mounting groove. The one-way valve 1 6 and the one-way valve 2 7 are opposite to the through hole 19.

[0037] Embodiment 3

[0038] like Figure 1-3As shown, a reverse osmosis membrane sewage treatment device proposed by the present invention comprises an inlet box 1, a treatment box, an outlet box 2 and a drive box 9; the inlet box 1 and the treatment box are connected via a one-way valve 6; the treatment box and the outlet box 2 are connected via a one-way valve 7; the drive box 9 is arranged on the treatment box, and a driving member is arranged inside; two groups of sewage treatment components 8 are arranged in the treatment box, and are divided into a sewage treatment chamber 1 3, a sewage treatment chamber 2 4 and a sewage treatment chamber 3 5; piston plates 13 are arranged in the sewage treatment chamber 1 3, the sewage treatment chamber 2 4 and the sewage treatment chamber 3 5, and the three groups of piston plates 13 are lifted and lowered by the driving member, wherein the piston plates 13 on both sides are lifted and lowered synchronously, and in the opposite direction to the middle piston plate 13. The sewage treatment component 8 includes a mounting plate 16, a treatment plate 17 and a motor 18; the mounting plate 16 is arranged in the treatment box to intercept sewage and clean the treatment plate 17, a motor 18 is arranged in the center, and a through hole 19 is arranged on the periphery; the treatment plate 17 is driven by the motor 18 and is rotatably arranged on the side of the mounting plate 16 facing the water outlet box 2, and a reverse osmosis membrane area 20 and a sealing area 21 are arranged on the periphery; the reverse osmosis membrane area 20 and the sealing area 21 are opposite to / interlaced with the through hole 19 as the treatment plate 17 rotates, and cover it.

[0039] It should be further explained that the driving part includes a motor 10, a rotating shaft 11 and an eccentric wheel 12; the rotating shaft 11 is driven by the motor 10, is horizontally positioned, and is rotatably arranged in the driving box 9; three groups of eccentric wheels 12 are arranged, the lower ends of which correspond to the piston plates 13 one by one, are slidably connected, and the upper ends are sequentially sleeved on the rotating shaft 11, and the convex ends of the middle eccentric wheel 12 and the eccentric wheels 12 on both sides are always in opposite directions. The rotating shaft 11 is driven to rotate by the motor 10, and the three groups of eccentric wheels 12 rotate synchronously, pushing the piston plates 13 to rise and fall alternately, thereby controlling the movement of sewage.

[0040] like Figure 4 As shown, a mounting groove is provided on the mounting plate 16; the processing plate 17 is rotatably arranged in the mounting groove. An ultrasonic cleaning area 22 is arranged above the mounting groove. The ultrasonic cleaning area 22 utilizes the cavitation effect, acceleration effect and straight flow effect of ultrasonic waves in the liquid to directly and indirectly act on the reverse osmosis membrane, so that the dirt layer is dispersed, emulsified and peeled off to achieve the purpose of cleaning. This makes the reverse osmosis performance of the reverse osmosis membrane stable and durable.

[0041] It should be further explained that the through hole 19 is arranged below the mounting groove. The one-way valve 1 6 and the one-way valve 2 7 are opposite to the through hole 19.

[0042] It should be further explained that a filter plate 14 is provided in the water inlet box 1; a water inlet is provided above the filter plate 14, and a one-way valve 6 is provided below. A mud collecting box 15 is provided at the bottom of the water inlet box 1; the mud collecting box 15 is located below the one-way valve 6. The water inlet box 1 performs preliminary filtration and sedimentation treatment on the incoming water.

[0043] It should be further explained that a water quality detector is arranged in the water outlet box 2 to detect the quality of the purified water.

[0044] Embodiment 4

[0045] The present invention further proposes a sewage treatment method of the above reverse osmosis membrane sewage treatment device, the steps are as follows:

[0046] S1, sewage first enters the water inlet tank 1, is filtered through the filter plate 14, and then a precipitant is added and mixed thoroughly and then allowed to stand;

[0047] S2, after the sedimentation is complete, the driving part is started, the eccentric wheel 12 is driven to rotate by the motor 2 10, the first and third groups of piston plates 13 move up, and the second group of piston plates 13 moves down; at this time, the sealing area 21 of the first group of sewage treatment components 8 is opposite to the through hole 19; the reverse osmosis membrane area 20 of the second sewage treatment component 8 is opposite to the through hole 19; the sewage enters the sewage treatment chamber 1 3 from the one-way valve 1 6, and the sewage in the sewage treatment chamber 2 4 enters the sewage treatment chamber 3 5 through the reverse osmosis membrane;

[0048] S3, the first and third groups of piston plates 13 move downward, the second group of piston plates 13 move upward, and the treatment plate 17 rotates. At this time, the sealing area 21 of the second group of sewage treatment components 8 is opposite to the through hole 19; the reverse osmosis membrane area 20 of the first sewage treatment component 8 is opposite to the through hole 19; the sewage enters the sewage treatment chamber 2 4 from the sewage treatment chamber 1 3 through the reverse osmosis membrane, and the purified sewage in the sewage treatment chamber 3 5 enters the water outlet tank 2;

[0049] S4, repeat the above operation, treat the sewage in the water inlet tank 1 in sequence, and transfer it to the water outlet tank 2. During the purification process, the ultrasonic cleaning area 22 is regularly started to descale and dredge the reverse osmosis membrane;

[0050] S5: The water in the water outlet tank 2 is discharged after being tested and found to be qualified.

[0051] The sewage treatment method in this embodiment adopts multiple and graded filtration to fully purify the sewage. The entire filtration process is coherent and efficient, consumes little manpower, and has a good purification effect.

[0052] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A reverse osmosis membrane sewage treatment device, characterized in that: The invention comprises a water inlet box (1), a treatment box, a water outlet box (2) and a drive box (9); the water inlet box (1) and the treatment box are connected via a one-way valve (6); the treatment box and the water outlet box (2) are connected via a one-way valve (7); the drive box (9) is arranged on the treatment box, and a drive member is arranged inside the treatment box; two groups of sewage treatment components (8) are arranged inside the treatment box, and are divided into a sewage treatment chamber (1) (3), a sewage treatment chamber (2) (4) and a sewage treatment chamber (3) (5); piston plates (13) are arranged inside the sewage treatment chamber (1) (3), the sewage treatment chamber (2) (4) and the sewage treatment chamber (3) (5), and the three groups of piston plates (13) are lifted and lowered by the drive member, wherein the piston plates (13) on both sides are lifted and lowered synchronously and in the opposite direction to the piston plate (13) in the middle; The sewage treatment component (8) comprises a mounting plate (16), a treatment plate (17) and a motor (18); the mounting plate (16) is arranged in a treatment box to intercept sewage and clean the treatment plate (17); the motor (18) is arranged at the center and a through hole (19) is arranged at the periphery; the treatment plate (17) is driven by the motor (18) and is rotatably arranged on a side of the mounting plate (16) facing the water outlet box (2); a reverse osmosis membrane area (20) and a sealing area (21) are arranged at the periphery; the reverse osmosis membrane area (20) and the sealing area (21) are opposite to / interlaced with the through hole (19) as the treatment plate (17) rotates, and cover the through hole (19).

2. A reverse osmosis membrane sewage treatment device according to claim 1, characterized in that: The mounting plate (16) is provided with a mounting groove; the processing plate (17) is rotatably arranged in the mounting groove.

3. A reverse osmosis membrane sewage treatment device according to claim 1, characterized in that: The through hole (19) is arranged below the mounting groove.

4. A reverse osmosis membrane sewage treatment device according to claim 1, characterized in that: An ultrasonic cleaning area (22) is arranged above the installation groove.

5. A reverse osmosis membrane sewage treatment device according to claim 1, characterized in that: The driving member comprises a second motor (10), a rotating shaft (11) and an eccentric wheel (12); the rotating shaft (11) is driven by the second motor (10), is horizontally positioned, and is rotatably arranged in a driving box (9); three groups of eccentric wheels (12) are arranged, the lower ends of which correspond to the piston plates (13) one by one and are slidably connected, and the upper ends are sequentially sleeved on the rotating shaft (11), and the convex ends of the middle eccentric wheel (12) and the eccentric wheels (12) on both sides are always in opposite directions.

6. A reverse osmosis membrane sewage treatment device according to claim 1, characterized in that: One-way valve 1 (6) and one-way valve 2 (7) are located opposite to the through hole (19).

7. A reverse osmosis membrane sewage treatment device according to claim 1, characterized in that: A filter plate (14) is arranged in the water inlet box (1); a water inlet is arranged above the filter plate (14), and a one-way valve (6) is arranged below the filter plate (14).

8. A reverse osmosis membrane sewage treatment device according to claim 1, characterized in that: A mud collecting box (15) is arranged at the bottom of the water inlet box (1); the mud collecting box (15) is located below the one-way valve (6).

9. A reverse osmosis membrane sewage treatment device according to claim 1, characterized in that: A water quality detector is arranged in the water outlet box (2).

10. A sewage treatment method comprising the reverse osmosis membrane sewage treatment device according to any one of claims 1 to 9, characterized in that: Here are the steps: S1, sewage first enters the water inlet tank (1), is filtered through the filter plate (14), a precipitant is added, mixed thoroughly and then left to stand; S2, after the sedimentation is complete, the driving member is started, and the eccentric wheel (12) is driven to rotate by the second motor (10), the first and third groups of piston plates (13) move upward, and the second group of piston plates (13) move downward; at this time, the sealing area (21) of the first group of sewage treatment components (8) is opposite to the through hole (19); the reverse osmosis membrane area (20) of the second sewage treatment component (8) is opposite to the through hole (19); the sewage enters the sewage treatment chamber one (3) from the one-way valve one (6), and the sewage in the sewage treatment chamber two (4) enters the sewage treatment chamber three (5) through the reverse osmosis membrane; S3, the first and third groups of piston plates (13) move downward, and the second group of piston plates (13) move upward, at which time the sealing area (21) of the second group of sewage treatment components (8) is opposite to the through hole (19); the reverse osmosis membrane area (20) of the first sewage treatment component (8) is opposite to the through hole (19); the sewage enters the sewage treatment chamber 2 (4) from the sewage treatment chamber 1 (3) through the reverse osmosis membrane, and the purified sewage in the sewage treatment chamber 3 (5) enters the water outlet tank (2); S4, repeat the above operation, treat the sewage in the water inlet tank (1) in sequence, and transfer it to the water outlet tank (2), and regularly start the ultrasonic cleaning area (22) during the purification process to descale and dredge the reverse osmosis membrane; S5. The water in the water outlet box (2) is discharged after being tested and found to be qualified.

Images