Oily wastewater treatment system and treatment method

Abstract

The present invention relates to an oily wastewater treatment system and a treatment method, wherein the oily wastewater treatment system comprises: a frame, which is provided with an inlet, a pipeline and a third outlet; a cylinder, which is rotatably arranged on the frame and provided with a first outlet; a cylinder, which is rotatably arranged in the cylinder, and the rotation of the cylinder can drive the cylinder to rotate together and make the water and oil stratification through centrifugal action, the bottom heavy oil is discharged from the first outlet, and the middle water can be discharged from the third outlet; a piston, which is slidably arranged on the pipeline and provided with a second outlet, can move downward and press on the upper floating oil, so that the upper floating oil can be discharged from the second outlet. The advantages of the present invention are: by setting a cylinder with a rotatable angle, the cylinder can realize centrifugal stratification and self-rotation separation through the change of the angle, thereby realizing that multiple treatment steps of industrial wastewater can be completed through one cylinder, without changing the container of the wastewater through a pump.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to an oily wastewater treatment system and a treatment method. Background Art

[0002] The oil substances contained in oily wastewater include natural petroleum, petroleum products, tar and its fractions, as well as edible animal and vegetable oils and fats. In terms of water pollution, it is mainly petroleum and tar. Since the oil concentration in wastewater discharged by different industrial sectors varies greatly, such as the wastewater produced during the oil refining process, the oil content is about 150-1000 mg / L, the tar content in coking wastewater is about 500-800 mg / L, and the tar content in wastewater discharged from gas generating stations can reach 2000-3000 mg / L. At present, the treatment of oily wastewater first needs to be allowed to stand to allow the oil and water to separate, and then the floating and heavy oils are recovered by scraping the oil, but this treatment method has the following problems:

[0003] 1. Since the existing oily wastewater is automatically separated from the oil and water by standing still, this treatment method is not only time-consuming and inefficient, but also has little effect on wastewater with less oil content. In addition, part of the oil in the wastewater is emulsified, making it impossible to automatically separate the oil and water by standing still;

[0004] 2. After the oily wastewater is left to stand and stratify, a heavy oil layer will form at the bottom. However, the heavy oil has low fluidity. At present, pipelines are generally inserted into the heavy oil layer to suck out the heavy oil by extraction. Not only will the pipelines stir the oil and water during the pipe laying process, causing the oil and water to mix again, but also the heavy oil will be mixed with a large amount of water due to the fluctuation of the heavy oil liquid level during extraction, reducing the recovery quality of the heavy oil.

[0005] 3. After the oily wastewater is allowed to stand and stratify, a floating oil layer is formed on the upper layer. In the prior art, the floating oil is scraped off from the liquid surface by scraping. This method will cause excessive agitation of the liquid surface, affecting the separation of oil and water. In addition, a large amount of water will be mixed in the floating oil, reducing the quality of the floating oil. Summary of the invention

[0006] Based on this, it is necessary to provide an oily wastewater treatment system and method to address the above problems.

[0007] The invention discloses an oil-containing wastewater treatment system, which comprises: a frame, which is provided with an inlet, a pipeline and a third outlet; a cylinder, which is rotatably arranged on the frame and is provided with a first outlet; a cylinder, which is rotatably arranged in the cylinder and can be deflected at an angle relative to the cylinder, and the oil-containing wastewater enters from the inlet and enters the cylinder through the pipeline. The rotation of the cylinder can drive the cylinder to rotate together and separate the water and oil layers through centrifugal action, so that the bottom heavy oil can be discharged from the first outlet and the middle water can be discharged from the third outlet; and a piston, which is slidably arranged on the pipeline and is provided with a second outlet. The piston can move downward and press on the upper floating oil so that the upper floating oil can be discharged from the second outlet.

[0008] In one of the embodiments, a motor is disposed on the frame, and an output end of the motor is fixedly connected to the cylinder barrel. Driving the motor can drive the cylinder barrel to rotate, thereby driving the cylinder body to follow the rotation.

[0009] In one embodiment, a first electric pole is provided on the cylinder barrel, and two ends of the first electric pole are respectively hinged to the cylinder barrel and the cylinder body. A rotating shaft is provided on the cylinder body, and the rotating shaft is rotationally connected to the cylinder body. Two ends of the rotating shaft are fixedly connected to the cylinder barrel, and driving the first electric pole to extend and retract can drive the cylinder body to rotate around the rotating shaft, thereby forming a certain angle relative to the cylinder barrel.

[0010] In one embodiment, a rotating wheel is rotatably provided at the bottom of the cylinder body, a blind hole is provided on the rotating wheel, a gear is provided on the rotating wheel, a third flow channel is provided at the bottom of the cylinder body, a protrusion and a rack are provided on the cylinder barrel, the rack can mesh with the gear, a second flow channel is provided on the cylinder barrel, the second flow channel passes through the protrusion and one end is connected to the first outlet, when the cylinder body rotates to the protrusion, the other end of the second flow channel is aligned with the third flow channel, and at the same time, the meshing of the rack and the gear drives the rotating wheel to rotate until the blind hole is aligned with the third flow channel, and the heavy oil in the blind hole can flow out of the first outlet through the third flow channel and the second flow channel in turn.

[0011] In one of the embodiments, a third electric rod is further provided on the frame, and the output end of the third electric rod is connected to the piston. A capillary and a cavity are provided on the piston. One side of the cavity is connected to the capillary, and the other side is connected to the second outlet. Driving the third electric rod can make the piston descend to press on the floating oil, so that the floating oil enters the cavity through the capillary and is discharged through the second outlet.

[0012] In one embodiment, the oily wastewater treatment system further comprises a sleeve, which is slidably disposed outside the cylinder body, a second through hole is formed on the sleeve, a first through hole is formed on the cylinder body, an oil removal film is formed in the second through hole, and the downward sliding of the sleeve can align the first through hole with the second through hole.

[0013] In one of the embodiments, a second electric rod is disposed on the cylinder body, an output end of the second electric rod is connected to the sleeve, and the extension and retraction of the second electric rod can drive the sleeve to slide.

[0014] In one embodiment, a groove is provided on the sleeve, and the rotating shaft is slidably disposed in the groove. When the motor electrically drives the cylinder to rotate, thereby driving the cylinder body to rotate, the rotating shaft slides and cooperates with the groove, so that the sleeve also rotates accordingly.

[0015] In one embodiment, a first flow channel is opened in the frame body, and a third through hole is opened on the cylinder barrel. One end of the first flow channel is connected to the third outlet, and the other end is connected to the third through hole. Water in the cylinder body can enter the cylinder barrel through the first through hole and the second through hole, and be discharged from the third outlet through the third through hole and the first flow channel.

[0016] The present invention also discloses a method for treating oily wastewater, which is treated by using the oily wastewater treatment system as described above. The method for treating oily wastewater comprises:

[0017] S1, loading: the industrial oily wastewater to be treated is introduced into the pipeline through the inlet, and the wastewater flows into the cylinder 31 to complete the loading;

[0018] S2, stratification: Control the first pole to contract, drive the cylinder to rotate around the axis, so that the cylinder deflects an angle, and then start the motor to drive the cylinder barrel to rotate, and then drive the cylinder to rotate. Due to the centrifugal force, the heavy oil in the wastewater is deposited under the cylinder, the water containing emulsified oil is in the middle layer, and the floating oil floats on the upper layer, thereby completing the stratification treatment of oily wastewater;

[0019] S3, heavy oil separation: when the wastewater in the cylinder is layered, the first electric pole is controlled to extend to drive the cylinder to swing, so that the third flow channel rotates to the protrusion. At the same time, due to the meshing of the rack and the gear, the rotating wheel is driven to rotate, so that the blind hole, the third flow channel and the second flow channel are aligned, and then the heavy oil in the blind hole flows out of the first outlet through the third flow channel and the second flow channel. By controlling the first electric pole to extend and contract in small amplitudes for multiple times, the rotating wheel can be driven to rotate back and forth, so that the blind hole discharges the heavy oil in the cylinder for multiple times, thereby completing the separation of the heavy oil;

[0020] S4, floating oil separation: control the first electric rod to drive the cylinder to move to a vertical position, control the third electric rod to extend, drive the piston to move downward into the cylinder until it presses on the floating oil, so that the floating oil enters the cavity through the capillary and is discharged through the second outlet;

[0021] S5. Discharge of middle layer water: control the second electric pole to extend, drive the sleeve to descend, align the first through hole with the second through hole, start the motor to drive the cylinder to rotate, and the shaft slides in the groove, thereby driving the sleeve to rotate. Under the action of centrifugal force, water enters the cylinder through the oil removal film, and is discharged and collected from the third outlet through the first flow channel, while the emulsified oil remains in the cylinder and is mixed with the next batch of oily industrial wastewater for treatment, thereby completing the treatment of industrial oily wastewater.

[0022] The advantages of the present invention are:

[0023] 1. By setting a cylinder body with a rotatable angle, the cylinder body can realize centrifugal stratification and self-rotation separation through the change of angle, so as to achieve multiple treatment steps of industrial wastewater through one cylinder body, without changing the container of wastewater through pump. Since the pump's delivery has the effect of increasing the emulsification of oil, the amount of emulsified oil in the water is reduced, making the wastewater better treated;

[0024] 2. A rotating wheel is arranged at the lower part of the cylinder body, and a blind hole is arranged on the rotating wheel. The heavy oil is discharged through the swing of the blind hole. In addition, through the cooperation between the cylinder body and the cylinder barrel, when the heavy oil is recovered, no liquid flow is generated in the wastewater, and no agitation is generated between the heavy oil and the water, thereby ensuring the recovery quality of the heavy oil;

[0025] 3. By arranging a piston on the pipeline and a capillary on the piston, after the oil and water are separated, the piston is controlled to enter the cylinder, and then the piston is pressed on the floating oil, so that the floating oil flows out through the capillary and is recovered. When water passes through the capillary, the piston stops descending, so that the water content in the flowing floating oil is less, thereby ensuring the recovery quality of the floating oil;

[0026] 4. A sleeve is slidably arranged outside the cylinder body, and a first through hole and a second through hole are arranged on the cylinder body and the sleeve, and an oil removal film is arranged in the second through hole. When the first through hole and the second through hole are aligned, centrifugal force is generated by the rotation of the cylinder body, so that the water in the cylinder body flows out through the oil removal film, and the emulsified oil in the water is retained in the cylinder body, thereby achieving separation of the emulsified oil and water. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a cross-sectional view of the present invention;

[0028] Figure 2 It is a cross-sectional view of the present invention when performing oil-water separation;

[0029] Figure 3 This is a cross-sectional view of the present invention when heavy oil is removed;

[0030] Figure 4 For the present invention Figure 1 The enlarged image at point I in the middle;

[0031] Figure 5 For the present invention Figure 1 Enlarged view of II in the middle;

[0032] Figure 6 For the present invention Figure 2 Enlarged view of point III in the middle;

[0033] Figure 7 For the present invention Figure 3 Enlarged view of point IV in the middle.

[0034] In the figure, the frame 1, the inlet 12, the third outlet 13, the first flow channel 11, the motor 6, the third electric rod 42, the cylinder body 31, the rotating shaft 311, the third flow channel 313, the first through hole 312, the second electric rod 33, the rotating wheel 71, the blind hole 711, the gear 72, the piston 41, the capillary 411, the cavity 412, the second outlet 415, the sleeve 32, the groove 321, the oil removal film 323, the second through hole 322, the cylinder 2, the second flow channel 21, the protrusion 22, the rack 23, the first electric rod 24, the first outlet 25, the third through hole 26, and the pipeline 5. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0038] like Figure 1 As shown, the present invention discloses an oily wastewater treatment system, which comprises: a frame 1, on which an inlet 12, a pipeline 5 and a third outlet 13 are provided; a cylinder 2, which is rotatably arranged on the frame 1 and provided with a first outlet 25; a cylinder 31, which is rotatably arranged in the cylinder 2 and can be deflected by an angle relative to the cylinder 2, and the oily wastewater enters from the inlet 12 and enters the cylinder 2 through the pipeline 5. The rotation of the cylinder 2 can drive the cylinder 31 to rotate together and separate the water and oil through centrifugal action, so that the bottom heavy oil can be discharged from the first outlet 25, and the middle water can be discharged from the third outlet 13; a piston 41, which is slidably arranged on the pipeline 5 and provided with a second outlet 415. The piston 41 can move downward and press on the upper floating oil so that the upper floating oil can be discharged from the second outlet 415.

[0039] Preferably, a motor 6 is disposed on the frame 1 , and an output end of the motor 6 is fixedly connected to the cylinder 2 , so that driving the motor 6 can drive the cylinder 2 to rotate, thereby driving the cylinder body 31 to rotate accordingly.

[0040] Preferably, a first electric rod 24 is provided on the cylinder 2, and two ends of the first electric rod 24 are respectively hinged to the cylinder 2 and the cylinder body 31, and a rotating shaft 311 is provided on the cylinder body 31. The rotating shaft 311 is rotatably connected to the cylinder body 31, and both ends of the rotating shaft 311 are fixedly connected to the cylinder 2. Driving the first electric rod 24 to extend and retract can drive the cylinder body 31 to rotate around the rotating shaft 311, thereby forming a certain angle relative to the cylinder 2.

[0041] It can be understood that by setting up the cylinder body 31 and controlling the cylinder body 31 to rotate relative to the cylinder barrel 2 through the first electric rod 24 to form a certain angle, and then starting the motor 6 to drive the cylinder barrel 2 and the cylinder body 31 to rotate together, the oily wastewater in the cylinder body 31 can be centrifugally stratified, with the heavy oil distributed in the bottom layer, the floating oil distributed in the upper layer, and the middle layer forming a water layer containing a certain amount of emulsified oil.

[0042] Preferably, Figure 5 and Figure 7As shown, a rotating wheel 71 is rotatably provided at the bottom of the cylinder body 31, a blind hole 711 is provided on the rotating wheel 71, a gear 72 is provided on the rotating wheel 71, a third flow channel 313 is provided at the bottom of the cylinder body 31, a protrusion 22 and a rack 23 are provided on the cylinder barrel 2, the rack 23 can mesh with the gear 72, a second flow channel 21 is provided on the cylinder barrel 2, the second flow channel 21 passes through the protrusion 22 and one end is connected to the first outlet 25, when the cylinder body 31 rotates to the protrusion 22, the other end of the second flow channel 21 is aligned with the third flow channel 313, and at the same time, the meshing of the rack 23 and the gear 72 drives the rotating wheel 71 to rotate until the blind hole 711 is aligned with the third flow channel 313, and the heavy oil in the blind hole 711 can flow out of the first outlet 25 through the third flow channel 313 and the second flow channel 21 in sequence.

[0043] It can be understood that by arranging the rotating wheel 71 at the bottom and opening the blind hole 711, the rotating wheel 71 is driven to rotate by the cooperation of the rack 23 and the gear 72, and the heavy oil in the blind hole 711 is discharged out of the cylinder barrel 2 through the cooperation between the cylinder body 31 and the cylinder barrel 2, so as to complete the separation of the heavy oil. Since the blind hole 711 is small in volume, no large liquid flow will be generated, and the heavy oil and water will not be mixed again, thereby ensuring the quality of the heavy oil.

[0044] Preferably, Figure 6 As shown, the frame 1 is also provided with a third electric rod 42, and the output end of the third electric rod 42 is connected to the piston 41. The piston 41 is provided with a capillary 411 and a cavity 412. One side of the cavity 412 is connected to the capillary 411, and the other side is connected to the second outlet 415. Driving the third electric rod 42 can make the piston 41 descend to press on the floating oil, so that the floating oil enters the cavity 412 through the capillary 411 and is discharged through the second outlet 415.

[0045] It can be understood that a plurality of capillaries 411 are provided on the piston 41 .

[0046] Preferably, Figure 4 As shown, the oily wastewater treatment system also includes a sleeve 32, which is slidably arranged outside the cylinder body 31, and a second through hole 322 is opened on the sleeve 32, and a first through hole 312 is opened on the cylinder body 31, and an oil removal film 323 is arranged in the second through hole 322, and the sleeve 32 slides downward to align the first through hole 312 and the second through hole 322.

[0047] Preferably, a second electric rod 33 is provided on the cylinder body 31 , an output end of the second electric rod 33 is connected to the sleeve 32 , and the extension and retraction of the second electric rod 33 can drive the sleeve 32 to slide.

[0048] Preferably, a groove 321 is provided on the sleeve 32, and the rotating shaft 311 is slidably disposed in the groove 321. When the motor 6 electrically drives the cylinder 2 to rotate, thereby driving the cylinder body 31 to rotate, the rotating shaft 311 slides and cooperates with the groove 321, so that the sleeve 32 also rotates accordingly.

[0049] It can be understood that a plurality of first through holes 312 are provided on the sleeve 32, and a plurality of second through holes 322 are provided on the cylinder body 31. When the second electric pole 33 is extended, the first through holes 312 and the second through holes 322 are aligned. When the second electric pole 33 is retracted, the first through holes 312 and the second through holes 322 are staggered, and the first through holes 312 are blocked.

[0050] Preferably, a first flow channel 11 is opened in the frame 1, and a third through hole is opened on the cylinder 2. One end of the first flow channel 11 is connected to the third outlet 13, and the other end is connected to the third through hole. Water in the cylinder body 31 can enter the cylinder 2 through the first through hole 312 and the second through hole 322, and be discharged from the third outlet 13 through the third through hole 26 and the first flow channel 11.

[0051] like Figures 1 to 3 As shown, the present invention also discloses a method for treating oily wastewater, which is treated by using the oily wastewater treatment system as described above. The method for treating oily wastewater comprises:

[0052] S1, loading: the industrial oily wastewater to be treated is introduced into the pipeline 5 through the inlet 12, and the wastewater flows into the cylinder 31, and the loading is completed;

[0053] S2, stratification: Figure 2 As shown, the first electric rod 24 is controlled to contract, driving the cylinder body 31 to rotate around the rotating shaft 311, so that the cylinder body 31 deflects an angle, and then the motor 6 is started to drive the cylinder barrel 2 to rotate, thereby driving the cylinder body 31 to rotate. Due to the centrifugal force, the heavy oil in the wastewater is deposited under the cylinder body 31, the water containing emulsified oil is in the middle layer, and the floating oil floats in the upper layer, thereby completing the stratified treatment of the oily wastewater;

[0054] S3, heavy oil separation: Figure 3As shown, when the wastewater in the cylinder 31 is layered, the first electric pole 24 is controlled to extend, driving the cylinder 31 to swing, so that the third flow channel 313 rotates to the protrusion 22, and at the same time, due to the meshing of the rack 23 and the gear 72, the rotating wheel 71 is driven to rotate, so that the blind hole 711, the third flow channel 313 and the second flow channel 21 are aligned, and then the heavy oil in the blind hole 711 flows out of the first outlet 25 through the third flow channel 313 and the second flow channel 21. By controlling the first electric pole 24 to extend and contract in small amplitudes for multiple times, the rotating wheel 71 can be driven to rotate back and forth, so that the blind hole 711 discharges the heavy oil in the cylinder 31 for multiple times, thereby completing the separation of the heavy oil;

[0055] S4. Oil separation: Figure 1 As shown, the first electric rod 24 is controlled to drive the cylinder 31 to move to a vertical position, and the third electric rod 42 is controlled to extend, driving the piston 41 to move downward into the cylinder 31 until it presses on the floating oil, so that the floating oil enters the cavity 412 through the capillary 411 and is discharged through the second outlet 415;

[0056] S5. Discharge of middle layer water: control the second electric pole 33 to extend, drive the sleeve 32 to descend, so that the first through hole 312 and the second through hole 322 are aligned, and start the motor 6 to drive the cylinder body 31 to rotate. Since the rotating shaft 311 slides in the groove 321, it drives the sleeve 32 to rotate accordingly. Under the action of centrifugal force, water enters the cylinder 2 through the oil removal film 323, and is discharged and collected from the third outlet 13 through the first flow channel 11, while the emulsified oil remains in the cylinder body 31 and is mixed with the next batch of oil-containing industrial wastewater for treatment, thereby completing the treatment of industrial oil-containing wastewater.

[0057] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An oily wastewater treatment system, characterized in that: The oily wastewater treatment system comprises: A frame, wherein the frame is provided with an inlet, a pipeline and a third outlet; A cylinder, the cylinder is rotatably arranged on the frame, and a first outlet is opened on the cylinder; A cylinder body, the cylinder body is rotatably arranged in the cylinder barrel, the cylinder body can be deflected at an angle relative to the cylinder barrel, the oily wastewater is introduced from the inlet, enters the cylinder barrel through the pipeline, the rotation of the cylinder barrel can drive the cylinder body to rotate together and separate the water and oil through centrifugal action, the bottom heavy oil can be discharged from the first outlet, and the middle water can be discharged from the third outlet; A piston, the piston is slidably disposed on the pipeline, a second outlet is opened on the piston, the piston can move downward and press on the upper floating oil, so that the upper floating oil can be discharged from the second outlet; A rotating wheel is rotatably provided at the bottom of the cylinder body, a blind hole is provided on the rotating wheel, a gear is provided on the rotating wheel, a third flow channel is provided at the bottom of the cylinder body, a protrusion and a rack are provided on the cylinder barrel, the rack can mesh with the gear, a second flow channel is provided on the cylinder barrel, the second flow channel passes through the protrusion and one end is connected to the first outlet, when the cylinder body rotates to the protrusion, the other end of the second flow channel is just aligned with the third flow channel, and at the same time, the meshing of the rack and the gear drives the rotating wheel to rotate until the blind hole is aligned with the third flow channel, and the heavy oil in the blind hole can flow out of the first outlet through the third flow channel and the second flow channel in sequence; The frame is also provided with a third electric rod, the output end of which is connected to the piston, and the piston is provided with a capillary tube and a cavity, one side of the cavity is connected to the capillary tube, and the other side of the cavity is connected to the second outlet, and the third electric rod is driven to make the piston descend to press on the floating oil, so that the floating oil enters the cavity through the capillary tube and is discharged through the second outlet; The oily wastewater treatment system further comprises a sleeve, which is slidably disposed outside the cylinder body, a second through hole is formed on the sleeve, a first through hole is formed on the cylinder body, an oil removal film is formed in the second through hole, and the sleeve can be alignable with the first through hole by sliding downward; The frame is provided with a motor, the output end of the motor is fixedly connected to the cylinder, and driving the motor can drive the cylinder to rotate, thereby driving the cylinder body to follow the rotation; The cylinder barrel is provided with a first electric rod, the two ends of which are respectively hinged to the cylinder barrel and the cylinder body, the cylinder body is provided with a rotating shaft, the rotating shaft is rotatably connected to the cylinder body, the two ends of the rotating shaft are fixedly connected to the cylinder barrel, and driving the first electric rod to extend and retract can drive the cylinder body to rotate around the rotating shaft, thereby forming a certain angle relative to the cylinder barrel; A second electric pole is disposed on the cylinder body, an output end of the second electric pole is connected to the sleeve, and the extension and retraction of the second electric pole can drive the sleeve to slide; The sleeve is provided with a groove, and the rotating shaft is slidably arranged in the groove. When the motor electrically drives the cylinder to rotate, thereby driving the cylinder body to rotate, the rotating shaft slides and cooperates with the groove, so that the sleeve also rotates accordingly; A first flow channel is opened in the frame body, and a third through hole is opened on the cylinder barrel. One end of the first flow channel is connected to the third outlet, and the other end is connected to the third through hole. Water in the cylinder body can enter the cylinder barrel through the first through hole and the second through hole, and be discharged from the third outlet through the third through hole and the first flow channel.

2. A method for treating oily wastewater, characterized in that: The oily wastewater treatment system according to claim 1 is used for treatment, and the oily wastewater treatment method comprises: S1, loading: the industrial oily wastewater to be treated is introduced into the pipeline through the inlet, and the wastewater flows into the cylinder 31 to complete the loading; S2, stratification: Control the first pole to contract, drive the cylinder to rotate around the axis, so that the cylinder deflects an angle, and then start the motor to drive the cylinder barrel to rotate, and then drive the cylinder to rotate. Due to the centrifugal force, the heavy oil in the wastewater is deposited under the cylinder, the water containing emulsified oil is in the middle layer, and the floating oil floats on the upper layer, thereby completing the stratification treatment of oily wastewater; S3, heavy oil separation: when the wastewater in the cylinder is layered, the first electric pole is controlled to extend to drive the cylinder to swing, so that the third flow channel rotates to the protrusion. At the same time, due to the meshing of the rack and the gear, the rotating wheel is driven to rotate, so that the blind hole, the third flow channel and the second flow channel are aligned, and then the heavy oil in the blind hole flows out of the first outlet through the third flow channel and the second flow channel. By controlling the first electric pole to extend and contract in small amplitudes for multiple times, the rotating wheel can be driven to rotate back and forth, so that the blind hole discharges the heavy oil in the cylinder for multiple times, thereby completing the separation of the heavy oil; S4, floating oil separation: control the first electric rod to drive the cylinder to move to a vertical position, control the third electric rod to extend, drive the piston to move downward into the cylinder until it presses on the floating oil, so that the floating oil enters the cavity through the capillary and is discharged through the second outlet; S5. Discharge of middle layer water: control the second electric pole to extend, drive the sleeve to descend, align the first through hole with the second through hole, start the motor to drive the cylinder to rotate, and the shaft slides in the groove, thereby driving the sleeve to rotate. Under the action of centrifugal force, water enters the cylinder through the oil removal film, and is discharged and collected from the third outlet through the first flow channel, while the emulsified oil remains in the cylinder and is mixed with the next batch of oily industrial wastewater for treatment, thereby completing the treatment of industrial oily wastewater.

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