A 5ppm oily water treatment device

Abstract

The application discloses a novel 5ppm oil-contaminated water treatment device, which comprises a bottom box and an oil-contaminated water treatment box fixedly arranged on the bottom box, and a filter residue chamber, a first-stage oil filter chamber and a second-stage oil filter chamber are sequentially arranged in the oil-contaminated water treatment box from left to right. The application not only accelerates oil-water layering through rotary centrifugal force, but also expands the oil-water centrifugal range by enabling the centrifugal range to move up and down. Meanwhile, the application can quickly separate the residue, and also utilizes the density difference between oil and water to realize gravity separation. The separated oil can be effectively collected in time, and the application is particularly suitable for use in a scene where the oil content of treated wastewater is required to be less than 5ppm. Only one driving motor is needed to realize the two functions of the up-and-down movement and rotary centrifugal movement of the stirring rod and the stirring blade, thereby greatly improving the oil-water separation efficiency and making the overall treatment effect better, so that the application is favorable for popularization and use.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment equipment technology, and in particular to a 5ppm oily wastewater treatment equipment. Background Technology

[0002] With the rapid development of industrial production, shipping, and oil extraction, the discharge of oily wastewater continues to increase. If discharged directly without effective treatment, it will cause serious pollution to the aquatic ecosystem and even endanger human health. Therefore, the purification and treatment of oily wastewater has become a key issue in environmental protection. The stringent discharge standard of 5 ppm (i.e., no more than 5 milligrams of oil per liter of wastewater) is widely used in scenarios with high environmental requirements, such as ships, offshore platforms, and oil refineries. Existing oily wastewater treatment technologies mainly include physical separation methods (such as gravity separation, centrifugal separation, and flotation separation), chemical treatment methods (such as demulsification and flocculation), membrane separation methods, and adsorption methods.

[0003] Currently, physical separation methods are widely used technologies. Gravity separation utilizes the density difference between oil and water, causing oil droplets to float naturally under gravity. However, existing methods have long separation cycles and are particularly ineffective for highly dispersed, tiny oil droplets. While existing methods use centrifugal force generated by high-speed rotation to accelerate oil-water stratification, the centrifugal range is relatively fixed, making it difficult to achieve sufficient centrifugation. Furthermore, for oily wastewater with a large amount of sludge, it is difficult to separate the sludge sufficiently and quickly, often hindering rapid oil-sludge separation.

[0004] Furthermore, existing technologies lack efficient, real-time collection mechanisms for the separated oil, which can easily lead to oil re-mixing into the treated water, reducing oil recovery rates and the compliance rate of treated water. Especially in high-standard scenarios requiring treated wastewater oil content below 5 ppm, existing technologies struggle to consistently meet these requirements. Therefore, this invention proposes a 5 ppm oily wastewater treatment device. Summary of the Invention

[0005] Based on the technical problems existing in the background art, the present invention proposes a 5ppm oily wastewater treatment device.

[0006] The present invention proposes a 5ppm oily wastewater treatment device, including a base box and an oily wastewater treatment tank fixedly installed on the base box. The oily wastewater treatment tank is provided with a filter cake chamber, a primary oil filtration chamber and a secondary oil filtration chamber from left to right. The top openings of the filter cake chamber, the primary oil filtration chamber and the secondary oil filtration chamber are all provided with covers.

[0007] A primary oil filter baffle is provided between the filter residue chamber and the primary oil filter chamber. The primary oil filter baffle is provided with a first oil filter port, and a filter residue filter plate is provided inside the first oil filter port. A secondary oil filter baffle is provided between the primary oil filter chamber and the secondary oil filter chamber. The secondary oil filter baffle is provided with a second oil filter port, and an oil filter plate is provided inside the second oil filter port.

[0008] The primary oil filtration chamber is equipped with a first float for floating on the water surface. The first float has a rectangular shape and is slidably and sealed to the front and rear inner walls of the primary oil filtration chamber. The secondary oil filtration chamber is equipped with a second float that is slidably and sealed. The bottom of both the first and second floats is fixedly connected to a vertically arranged riser. The bottom end of the riser slides through the bottom box and is fixedly fitted with a counterweight. The bottom end of the riser is fixedly connected to an oil storage tank through an oil delivery hose, and the oil storage tank is installed on the bottom inner wall of the bottom box. Both the first and second floats are equipped with oil suction pumps. The output end of the oil suction pump is connected to the riser, and the suction end of the oil suction pump is fixedly connected to a suction head for collecting the oil separated on the water surface.

[0009] A filter screen frame is fixedly installed inside the filter screen frame, and a movable rod is movably installed inside the filter screen frame. Multiple stirring rods are fixedly installed on the movable rod. A lifting plate is slidably installed on the left inner wall of the bottom box, and a lifting box is fixedly connected to the lifting plate. The bottom end of the movable rod is movably installed inside the lifting box. A horizontally arranged worm gear is rotatably installed inside the lifting box, and a worm wheel is fixedly sleeved on the movable rod. The worm gear and the worm wheel mesh. A drive motor is fixedly installed on the left side of the lifting box. The output shaft of the drive motor is fixedly connected to the left end of the worm gear. A rotating shaft is fixedly connected to the right end of the worm gear. The right end of the rotating shaft rotates through to the outside of the lifting box and is fixedly sleeved with an eccentric wheel. Rollers arranged side by side are rotatably installed on the bottom side of the oily wastewater treatment tank through a mounting bracket, and the top of the eccentric wheel is in rolling contact with the rollers. A return spring is fixedly connected between the lifting plate and the bottom inner wall of the bottom box.

[0010] As a further aspect of the present invention, a water inlet pipe is installed on the left side of the filter screen frame, and the left end of the water inlet pipe extends to the outside of the oily wastewater treatment tank; a drain pipe is provided on the right side of the oily wastewater treatment tank; a slag discharge port is provided on the front side of the oily wastewater treatment tank; and an oil discharge pipe is provided on the front side of the oil storage tank, with the front end of the oil discharge pipe extending to the outside of the oily wastewater treatment tank.

[0011] As a further part of the present invention, sealing sliding strips are provided at both the front and rear ends of the first float and the second float, and the first float and the second float are slidably connected to the front and rear inner walls of the oily wastewater treatment tank through the sealing sliding strips.

[0012] As a further part of the present invention, the stirring rod is provided with stirring blades, and the stirring blades are provided with arc-shaped concave blade surfaces for increasing the stirring area.

[0013] As a further aspect of the present invention, a guide slider is provided at the left end of the lifting plate, and a guide rail is provided on the left inner wall of the base box, with the guide slider slidably mounted on the guide rail in the vertical direction.

[0014] As a further part of the present invention, the top inner wall of the lifting box is provided with a mounting hole, a bearing is fixedly installed in the mounting hole, and the movable rod is rotatably installed on the bearing.

[0015] As a further part of the present invention, a first sealing sleeve is fixedly installed on the bottom inner wall of the oily wastewater treatment tank, and a second sealing sleeve is fixedly installed on the bottom inner wall of the filter screen frame. The movable rod slides through the first sealing sleeve and the second sealing sleeve, and the movable rod moves up and down and rotates simultaneously based on the movement trajectory of the first sealing sleeve and the second sealing sleeve.

[0016] As a further part of the present invention, a controller is provided on the front side of the oily wastewater treatment tank, and the controller is electrically connected to the drive motor and the oil suction pump respectively.

[0017] The beneficial effects of this invention are:

[0018] 1. In this invention, the drive motor drives the worm to rotate and mesh with the worm wheel, causing the movable rod, stirring rod and stirring blade to rotate. Under the centrifugal force of the rotation of the stirring rod and stirring blade, and with the help of the filter screen to filter the oil residue, the oil in the water can be quickly separated.

[0019] 2. In this invention, when the worm gear rotates, it also drives the eccentric wheel to rotate through the shaft. When the eccentric wheel rotates, it rolls relative to the roller, which causes the shaft, lifting box, and lifting plate to move up and down during the rotation of the eccentric wheel. At the same time, the return spring plays a resetting role. When the lifting box moves up and down, it also drives the movable rod, stirring rod, and stirring blade to move up and down as a whole. This allows the stirring rod and stirring blade to perform rotational centrifugal motion during the up and down movement, thereby expanding the centrifugal treatment range of the stirring rod and stirring blade for oily wastewater, which is conducive to fully and evenly separating oil and water. Moreover, only one drive motor is needed to work to realize the two functions of up and down movement of the stirring rod and stirring blade and rotational centrifugal motion, which greatly improves the oil-water separation efficiency.

[0020] 3. In this invention, a filter plate and a first oil filter inlet are installed on the primary oil filter baffle to further filter the oil residue in the oil and water. The separated oil and water flow into the primary oil filter chamber through the first oil filter inlet. Simultaneously, under the action of gravity separation, the oil floats on the water surface and is also floated on the water surface by the first float, which can be used to relatively block and collect the oil in the primary oil filter chamber. The oil suction pump works and sucks up the floating oil through the suction head, and then transmits it through the riser and oil delivery hose. Finally, the collected oil is collected into the oil storage tank. This can collect the separated oil in a timely manner, avoiding the situation in the past where the separated oil was easily mixed with the water due to the lack of an efficient and timely collection mechanism, thus improving the oil recovery rate and the compliance rate of the treated water.

[0021] In summary, this 5ppm oily wastewater treatment device not only accelerates oil-water stratification through centrifugal force, but also expands the centrifugal range by allowing the centrifugal range to move vertically, thus rapidly separating the sludge. Furthermore, it utilizes the density difference between oil and water for gravity separation, and the separated oil can be collected promptly and effectively. It is particularly suitable for applications requiring treated wastewater with an oil content below 5ppm. Moreover, it only requires a single drive motor to achieve both the vertical movement of the stirring rod and blades and the centrifugal rotation, significantly improving oil-water separation efficiency and resulting in better overall treatment performance, thus facilitating widespread adoption. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a 5ppm oily wastewater treatment device proposed in this invention;

[0023] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0024] Figure 3 For the present invention Figure 2 A partial structural diagram;

[0025] Figure 4 This is a schematic diagram showing a partial detail of the first floating hull in this invention;

[0026] Figure 5 This is a sectional side view of the first floating hull and the oily wastewater treatment tank of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure between the worm, worm wheel, and moving rod in this invention.

[0028] In the diagram: 1. Oily wastewater treatment tank; 100. Cover; 101. Filter cake chamber; 102. Primary oil filtration chamber; 103. Secondary oil filtration chamber; 104. Water inlet pipe; 105. Sludge discharge port; 106. Drain pipe; 107. Oil discharge pipe; 2. Bottom box; 3. Primary oil filtration baffle; 301. Filter cake filter plate; 302. First oil filtration port; 4. Secondary oil filtration baffle; 401. Oil filtration plate; 402. Second oil filtration port; 5. Filter cake mesh frame; 6. Lifting box; 7. Drive motor; 8. Worm gear; 9. Worm wheel; 10. Movable rod; 11. Bearing; 12. First sealing sleeve; 13. Second sealing sleeve; 14. Stirring rod; 141. Stirring blade; 15. Rotating shaft; 16. Eccentric wheel; 17. Roller; 18. Mounting bracket; 19. Lifting plate; 20. Return spring; 21. First float; 22. Second float; 23. Oil; 24. Oil suction pump; 25. Suction head; 26. Riser; 27. Counterweight; 28. Oil delivery hose; 29. ​​Oil storage tank; 30. Controller; 31. Sealing sliding strip; 32. Guide slider. Detailed Implementation

[0029] The present invention will be further explained below with reference to specific embodiments.

[0030] Example

[0031] refer to Figure 1-6 This embodiment proposes a 5ppm oily wastewater treatment device, including a bottom box 2 and an oily wastewater treatment tank 1 fixedly installed on the bottom box 2. The oily wastewater treatment tank 1 is provided with a filter cake chamber 101, a primary oil filtration chamber 102 and a secondary oil filtration chamber 103 from left to right. The top openings of the filter cake chamber 101, the primary oil filtration chamber 102 and the secondary oil filtration chamber 103 are all provided with a cover 100.

[0032] A primary oil filter baffle 3 is provided between the filter cake chamber 101 and the primary oil filter chamber 102. The primary oil filter baffle 3 has a first oil filter port 302, and a filter cake filter plate 301 is provided inside the first oil filter port 302. A secondary oil filter baffle 4 is provided between the primary oil filter chamber 102 and the secondary oil filter chamber 103. The secondary oil filter baffle 4 has a second oil filter port 402, and an oil filter plate 401 is provided inside the second oil filter port 402. A first float 21 for floating on the water surface is movably provided in the primary oil filter chamber 102. The first float 21 has an overall rectangular structure, and the first float 21 is tightly sealed to the front and rear inner walls of the primary oil filter chamber 102. The system features a sealed sliding connection; a second float 22 is slidably installed in the secondary oil filtration chamber 103, and vertically arranged risers 26 are fixedly connected to the bottom of both the first float 21 and the second float 22. The bottom end of the riser 26 is slidably inserted into the bottom box 2 and fixedly fitted with a counterweight 27; the bottom end of the riser 26 is fixedly connected to an oil storage tank 29 via an oil delivery hose 28, and the oil storage tank 29 is installed on the bottom inner wall of the bottom side of the bottom box 2; an oil suction pump 24 is installed in both the first float 21 and the second float 22, the output end of the oil suction pump 24 is connected to the riser 26, and the suction end of the oil suction pump 24 is fixedly connected to a suction head 25 for collecting the oil 23 separated on the water surface;

[0033] A filter screen frame 5 is fixedly installed inside the filter screen chamber 101. A movable rod 10 is movably installed inside the filter screen frame 5, and multiple stirring rods 14 are fixedly installed on the movable rod 10. A lifting plate 19 is slidably installed on the inner left side of the bottom box 2. A lifting box 6 is fixedly connected to the lifting plate 19. The bottom end of the movable rod 10 is movably installed inside the lifting box 6. A horizontally arranged worm gear 8 is rotatably installed inside the lifting box 6. A worm wheel 9 is fixedly sleeved on the movable rod 10, and the worm gear 8 meshes with the worm wheel 9. The left side of the lifting box 6... A drive motor 7 is fixedly installed on the side. The output shaft of the drive motor 7 is fixedly connected to the left end of the worm gear 8. A rotating shaft 15 is fixedly connected to the right end of the worm gear 8. The right end of the rotating shaft 15 rotates through to the outside of the lifting box 6 and is fixedly sleeved with an eccentric wheel 16. Rollers 17 arranged in parallel front and rear are rotatably installed on the bottom side of the oily wastewater treatment tank 1 through the mounting bracket 18, and the top of the eccentric wheel 16 is in rolling connection with the rollers 17. A return spring 20 is fixedly connected between the lifting plate 19 and the bottom inner wall of the bottom box 2.

[0034] like Figure 1-2 In the middle, a water inlet pipe 104 is installed on the left side of the filter screen frame 5, and the left end of the water inlet pipe 104 extends to the outside of the oily wastewater treatment tank 1; a drain pipe 106 is provided on the right side of the oily wastewater treatment tank 1; a slag discharge port 105 is provided on the front side of the oily wastewater treatment tank 1; an oil discharge pipe 107 is provided on the front side of the oil storage tank 29, and the front end of the oil discharge pipe 107 extends to the outside of the oily wastewater treatment tank 1.

[0035] like Figure 2 , Figure 5In the middle, sealing sliding strips 31 are provided at both the front and rear ends of the first float 21 and the second float 22. The first float 21 and the second float 22 are both slidably connected to the front and rear inner walls of the oily wastewater treatment tank 1 through the sealing sliding strips 31. The stirring rod 14 is provided with stirring blades 141, and the stirring blades 141 are provided with arc-shaped concave blade surfaces for increasing the stirring area.

[0036] like Figure 3 In the middle, the left end of the lifting plate 19 is provided with a guide slider 32, and the left inner wall of the base box 2 is provided with a guide rail. The guide slider 32 is slidably installed on the guide rail in the vertical direction. The top inner wall of the lifting box 6 is provided with an installation hole, and a bearing 11 is fixedly installed in the installation hole. The movable rod 10 is rotatably installed on the bearing 11.

[0037] The oily wastewater treatment tank 1 has a first sealing sleeve 12 fixedly installed on the bottom inner wall, and a second sealing sleeve 13 fixedly installed on the bottom inner wall of the filter screen frame 5. The movable rod 10 slides through the first sealing sleeve 12 and the second sealing sleeve 13, and the movable rod 10 moves up and down and rotates simultaneously based on the movement trajectory of the first sealing sleeve 12 and the second sealing sleeve 13. A controller 30 is provided on the front side of the oily wastewater treatment tank 1, and the controller 30 is electrically connected to the drive motor 7 and the oil suction pump 24 respectively.

[0038] See Figure 1-6In operation, by setting up a filter screen frame 5, oil residue in oily wastewater can be filtered. Simultaneously, the drive motor 7 operates, driving the worm gear 8 to rotate and mesh with the worm wheel 9, causing the movable rod 10, stirring rod 14, and stirring blade 141 to rotate. Under the centrifugal force of the rotating stirring rod 14 and stirring blade 141, the oil in the water can be quickly separated. At the same time, the rotation of the worm gear 8 also drives the eccentric wheel 16 to rotate via the rotating shaft 15. The eccentric wheel 16 rotates relative to the roller 17, causing the rotating shaft 15, lifting box 6, and roller 17 to rotate during the rotation process. The lifting plate 19 moves up and down, while the return spring 20 plays a resetting role. When the lifting box 6 moves up and down, it also drives the movable rod 10, the stirring rod 14, and the stirring blade 141 to move up and down as a whole. This allows the stirring rod 14 and the stirring blade 141 to perform rotational centrifugal motion during the up and down movement, thereby expanding the centrifugal treatment range of the stirring rod 14 and the stirring blade 141 for oily wastewater. This is beneficial for fully and evenly separating oil and water. Moreover, only one drive motor 7 is needed to work to realize the two functions of the up and down movement of the stirring rod 14 and the stirring blade 141 and the rotational centrifugal motion, which greatly improves the oil-water separation efficiency. Furthermore, the oil and water in the oily wastewater seeps out through the filter screen 5. A filter plate 301 and a first oil filter inlet 302 are also installed on the primary oil filter baffle 3. The filter plate 301 further filters the oil residue in the oily wastewater. The separated oil and water flow into the primary oil filter chamber 102 through the first oil filter inlet 302. Simultaneously, under gravity separation, the oil 23 floats on the water surface and is also floated on the water surface by the first float shell 21. The first float shell 21 then filters the primary oil... The oil in the oil chamber 102 is relatively isolated and collected. At the same time, the oil suction pump 24 works and the suction head 25 is used to suck up the floating oil 23. Then it is transferred through the riser 26 and the oil delivery hose 28. Finally, the collected oil is collected into the oil storage tank 29. This can collect the separated oil in a timely manner, avoiding the situation in the past where the separated oil was easily mixed with the water due to the lack of an efficient and timely collection mechanism. This improves the oil recovery rate and the compliance rate of the treated water. Furthermore, by setting an oil filter plate 401 and a second oil filter port 402 on the secondary oil filter baffle 4, the separated water can flow into the secondary oil filter chamber 103 through the second oil filter port 402. At the same time, the oil filter plate 401 can be used to further filter the oil. Similarly, by setting a second float 22, the treated water and oil in the secondary oil filter chamber 103 can be further collected. Both the first float 21 and the second float 22 can rise and fall with the rise and fall of the water level. Finally, the water after oil separation can be discharged through the drain pipe 106.

[0039] In summary, this invention not only accelerates oil-water separation through centrifugal force generated by rotation, but also expands the centrifugal range by allowing for vertical movement, resulting in better oil-water centrifugal separation. It also rapidly separates sludge and utilizes the density difference between oil and water for gravity separation, allowing the oil to naturally float and separate under gravity. Furthermore, the separated oil can be collected promptly and effectively. This invention is particularly suitable for applications requiring treated wastewater with an oil content below 5 ppm, leading to better overall treatment results and facilitating widespread adoption.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A 5 ppm oily water treatment device comprising a bottom tank (2) and an oily water treatment tank (1) fixedly arranged on the bottom tank (2), characterized in that, The oil contaminated water treatment box (1) is sequentially provided with a residue filtering chamber (101), a first oil filtering chamber (102) and a second oil filtering chamber (103) from left to right; the residue filtering chamber (101), the first oil filtering chamber (102) and the second oil filtering chamber (103) are all provided with cover bodies (100) at the top openings thereof; The residue filtering chamber (101) and the first oil filtering chamber (102) are provided with a first oil filtering partition plate (3), the first oil filtering partition plate (3) is provided with a first oil filtering through opening (302), and the first oil filtering through opening (302) is provided with a residue filtering plate (301); the first oil filtering chamber (102) and the second oil filtering chamber (103) are provided with a second oil filtering partition plate (4), the second oil filtering partition plate (4) is provided with a second oil filtering through opening (402), and the second oil filtering through opening (402) is provided with an oil filtering plate (401); The first oil filtering chamber (102) is movably provided with a first floating shell (21) for floating on the water surface, the first floating shell (21) has an overall rectangular structure, and the first floating shell (21) is sealingly and slidably connected to the front and rear inner walls of the first oil filtering chamber (102); the second oil filtering chamber (103) is sealingly and slidably provided with a second floating shell (22), the bottom of the first floating shell (21) and the bottom of the second floating shell (22) are both fixedly connected with a vertical stand pipe (26), the bottom end of the stand pipe (26) is sealingly and slidably penetrated into the bottom box (2) and fixedly sleeved with a counterweight (27); the bottom end of the stand pipe (26) is fixedly connected with an oil storage tank (29) through an oil conveying hose (28), and the oil storage tank (29) is installed on the bottom side inner wall of the bottom box (2); the first floating shell (21) and the second floating shell (22) are both provided with an oil suction pump (24), the output end of the oil suction pump (24) is connected with the stand pipe (26), and the suction end of the oil suction pump (24) is fixedly connected with a suction head (25) for collecting the oil (23) separated on the water surface; The filter residue chamber (101) is fixedly provided with a filter residue screen frame (5), the filter residue screen frame (5) is movably provided with a movable rod (10), a plurality of stirring rods (14) are fixedly installed on the movable rod (10); a lifting plate (19) is slidably installed on the left side inner wall of the bottom box (2), the lifting plate (19) is fixedly connected with a lifting box (6), the bottom end of the movable rod (10) is movably installed in the lifting box (6), a transversely arranged worm (8) is rotatably installed in the lifting box (6), a worm wheel (9) is fixedly sleeved on the movable rod (10), the worm (8) is engaged with the worm wheel (9); a driving motor (7) is fixedly installed on the left side of the lifting box (6), the output shaft of the driving motor (7) is fixedly connected with the left end of the worm (8), the right end of the worm (8) is fixedly connected with a rotating shaft (15), the right end of the rotating shaft (15) is rotatably penetrated to the outside of the lifting box (6) and fixedly sleeved with an eccentric wheel (16), the bottom side of the oil and dirt water treatment box (1) is rotatably installed with front and rear side-by-side arranged rollers (17) through a mounting bracket (18), and the top of the eccentric wheel (16) is rollingly connected with the rollers (17); the lifting plate (19) and the bottom side inner wall of the bottom box (2) are fixedly connected with a return spring (20).

2. A 5 ppm oily water treatment device according to claim 1, characterized in that The left side of the filter residue screen frame (5) is provided with a water inlet pipe (104), the left end of the water inlet pipe (104) extends to the outside of the oil and dirt water treatment box (1); the right side of the oil and dirt water treatment box (1) is provided with a drain pipe (106); the front side of the oil and dirt water treatment box (1) is provided with a residue discharge port (105); the front side of the oil storage tank (29) is provided with an oil discharge pipe (107), the front end of the oil discharge pipe (107) extends to the outside of the oil and dirt water treatment box (1).

3. A 5 ppm oily water treatment device according to claim 1, characterized in that, The front and rear ends of the first floating shell (21) and the second floating shell (22) are provided with sealing sliding bars (31), and the first floating shell (21) and the second floating shell (22) are sealingly and slidingly connected with the front and rear inner walls of the oil and dirt water treatment box (1) through the sealing sliding bars (31).

4. The 5 ppm oily water treatment device according to claim 1, wherein The stirring rod (14) is provided with a stirring blade (141), and the stirring blade (141) is provided with an arc-shaped concave surface for increasing the stirring area.

5. The 5 ppm oily water treatment device according to claim 1, wherein The left end of the lifting plate (19) is provided with a guide sliding block (32), and the left side inner wall of the bottom box (2) is provided with a guide rail, and the guide sliding block (32) is slidably installed on the guide rail in the vertical direction.

6. A 5 ppm oily water treatment unit as claimed in claim 1, wherein, The top inner wall of the lifting box (6) is provided with a mounting hole, a bearing (11) is fixedly installed in the mounting hole, and the movable rod (10) is rotatably installed on the bearing (11).

7. A 5 ppm oily water treatment device according to claim 1, characterized in that, The bottom inner wall of the oil and dirt water treatment box (1) is fixedly installed with a first sealing sleeve (12), the bottom inner wall of the filter residue screen frame (5) is fixedly installed with a second sealing sleeve (13), the movable rod (10) is sealingly and slidingly penetrated in the first sealing sleeve (12) and the second sealing sleeve (13), and the movement trajectory of the movable rod (10) based on the first sealing sleeve (12) and the second sealing sleeve (13) is the simultaneous cooperation of the upward movement and the rotary movement.

8. A 5 ppm oily water treatment unit as claimed in claim 1, wherein, The oil sewage treatment tank (1) is provided with a controller (30) at the front side, and the controller (30) is electrically connected with the driving motor (7) and the oil suction pump (24) respectively.

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