Multi-stage treatment equipment for purifying wastewater by using waste mineral oil

Abstract

The invention discloses multi-stage treatment equipment for waste mineral oil purification wastewater, and relates to the technical field of wastewater treatment.The multi-stage treatment equipment comprises a precipitation cylinder and a disinfection tank, the upper side of the disinfection tank is fixedly connected with a fixing pipe, the upper end of the fixing pipe is fixedly connected with a filtering cylinder, and the upper side of the precipitation cylinder is fixedly connected with a feeding pipe and a motor; a treatment unit is arranged on the precipitation cylinder and the filter cylinder, the treatment unit comprises a rotating pipe I, the rotating pipe I is rotationally connected to the inner side of the precipitation cylinder, and a rotating roller is fixedly connected to the lower end of the rotating pipe I. According to the multi-stage treatment equipment for purifying the wastewater from the waste mineral oil, the precipitation cylinder, the filter cylinder and the disinfection tank are arranged, so that the wastewater is subjected to multi-stage treatment conveniently, and a demulsifier is conveniently added into the wastewater when the centrifugal rod is controlled to rotate during treatment through a rotating pipe I, a centrifugal rod, a mounting frame, a guide plate I, a guide block I, a mounting pipe, a chemical discharging pipe and a feeding pipe; the emulsified oil in the waste mineral oil water is quickly treated.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a multi-stage treatment device for purifying wastewater from waste mineral oil. Background Technology

[0002] Waste mineral oil refers to mineral oil extracted and refined from petroleum, coal, and oil shale that loses its original function due to pollution, oxidation, or heating during mining, processing, and use. Wastewater (usually called "waste mineral oil regeneration wastewater" or "oil washing wastewater") is generated during the purification process of waste mineral oil. This wastewater needs to undergo multi-stage treatment to facilitate the discharge of sewage.

[0003] A search revealed a Chinese patent with application number "CN201911095158.0", which specifically describes a multi-stage wastewater treatment device. The device includes a water pump, with its inlet fixedly connected to one end of an inlet pipe. The other end of the inlet pipe is located at the bottom of a sedimentation tank. A magnetic attraction mechanism is fixedly connected to the side of the sedimentation tank. The water outlet of the water pump is fixedly connected to one end of a connecting pipe, the other end of which is fixedly connected to the upper wall of a filter box. The lower wall of the filter box is fixedly connected to the upper surface of a disinfection tank. An activated carbon filter plate is fixedly connected to the inner side of the filter box by screws. An outlet pipe is fixedly connected to the side of the disinfection tank. This magnetic attraction mechanism can adsorb iron and other metals from the wastewater, collecting and reusing metal resources, thus preventing them from being treated like other impurities.

[0004] Existing wastewater treatment equipment involves placing wastewater in a sedimentation tank for settling, then filtering it through activated carbon plates, and finally disinfecting it in a disinfection tank. However, the most significant characteristic of waste mineral oil wastewater is that it contains a large amount of emulsified oil, which is extremely stable and cannot be separated by natural sedimentation. Directly filtering it through activated carbon plates can easily cause the high-viscosity emulsified oil to clog the activated carbon plates, which is not conducive to continuous wastewater treatment.

[0005] Therefore, this invention proposes a multi-stage treatment device for purifying wastewater from waste mineral oil to solve the aforementioned problems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a multi-stage treatment device for waste mineral oil purification wastewater, which solves the problem that waste mineral oil wastewater contains a large amount of emulsified oil and the treatment effect of emulsified oil is poor.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A multi-stage treatment device for purifying wastewater from waste mineral oil includes a sedimentation tank and a disinfection tank. A fixed pipe is fixedly connected to the upper side of the disinfection tank, and a filter cylinder is fixedly connected to the upper end of the fixed pipe. A feed pipe and a motor are fixedly connected to the upper side of the sedimentation tank. A treatment unit is provided on the sedimentation tank and the filter cylinder. The treatment unit includes a rotating pipe that is rotatably connected to the inner side of the sedimentation tank. A rotating roller is fixedly connected to the lower end of the rotating pipe. Multiple centrifugal rods are fixedly connected to the outer side of the rotating roller. A guide plate is fixedly connected to the inner side of the sedimentation tank. A guide block is slidably connected to the outer side of the guide plate. A side block is fixedly connected to the outer side of the guide block. An installation pipe is provided on the outer side of the side block. Multiple chemical discharge pipes are fixedly connected to the outer side of the installation pipe.

[0008] Preferably, a water pump is fixedly connected to the left side of the disinfection tank, a connecting pipe is fixedly connected between the water pump and the sedimentation tank, a conveying pipe is fixedly connected between the water pump and the filter tank, an outlet pipe and a drug inlet pipe are fixedly connected to the right side of the disinfection tank, a drug inlet hopper is fixedly connected to the upper end of the drug inlet pipe, and a valve is provided on the outside of the outlet pipe.

[0009] Preferably, a mounting bracket is fixedly connected between the first rotating tube and the first guide block, a branch pipe is fixedly connected between the mounting pipe and the first rotating tube, a fixed cylinder is fixedly connected to the upper side of the sedimentation cylinder, a feeding pipe is fixedly connected to the upper side of the fixed cylinder, and the lower end of the feeding pipe is located inside the first rotating tube.

[0010] Preferably, a gear is fixedly connected to the outer side of the rotating tube, a rotating shaft is rotatably connected to the inner side of the sedimentation cylinder, a gear is fixedly connected to the outer side of the rotating shaft and meshes with the gear, and the output end of the motor is fixedly connected to the upper end of the rotating shaft.

[0011] Preferably, a second fixed cylinder is fixedly connected to the upper side of the filter cylinder, a control rod is rotatably connected to the inner side of the second fixed cylinder, multiple second fan blades are fixedly connected to the outer side of the control rod, an output pipe is fixedly connected between the first fixed cylinder and the second fixed cylinder, multiple branch plates are fixedly connected to the lower end of the control rod, a scraper is fixedly connected to the lower side of the branch plates, a filter plate is fixedly connected to the inner side of the filter cylinder and below the scraper, an air inlet pipe is fixedly connected to the left side of the first fixed cylinder, and multiple first fan blades are fixedly connected to the outer side of the first rotating pipe and inside the first fixed cylinder.

[0012] Preferably, a second rotating tube is fixedly connected to the lower side of the rotating roller, the second rotating tube is rotatably connected to the sedimentation cylinder, a plurality of aeration pipes are fixedly connected to the outer side of the second rotating tube, a plurality of aeration holes are opened on the outer side of the aeration pipes, a side pipe is fixedly connected between the second fixed cylinder and the sedimentation cylinder, and the side pipe communicates with the second rotating tube.

[0013] Preferably, a rotating rod is rotatably connected to the outer side of the side block, the rotating rod is fixedly connected to the mounting tube, a rotating block is fixedly connected to the outer end of the rotating rod, an inclined plate is rotatably connected to the outer side of the rotating block, a second guide plate is fixedly connected to the upper side of the mounting frame, a second guide block is slidably connected to the outer side of the second guide plate, the second guide block is rotatably connected to the inclined plate, a stop rod is fixedly connected to the outer side of the second guide block, and multiple protrusions are fixedly connected to the inner side of the sedimentation cylinder.

[0014] Preferably, the abutment abuts against the protrusion, a fixing block is fixedly connected to the upper side of the mounting frame, a spring is fixedly connected between the fixing block and the guide block, and a fixing cover is fixedly connected to the outer side of the mounting frame.

[0015] This invention provides a multi-stage treatment device for purifying wastewater from waste mineral oil. Compared with existing technologies, it has the following advantages: (1) The multi-stage treatment equipment for waste mineral oil purification wastewater is equipped with a sedimentation tank, a filter tank and a disinfection tank to facilitate multi-stage treatment of wastewater. It is also equipped with a transfer pipe, a centrifugal rod, a mounting frame, a guide plate, a guide block, a mounting pipe, a discharge pipe and a feeding pipe to facilitate the addition of demulsifier to the wastewater when the centrifugal rod rotates, so as to quickly treat the emulsified oil in the waste mineral oil water.

[0016] (2) The multi-stage treatment equipment for waste mineral oil purification wastewater is equipped with a fixed cylinder one, a fixed cylinder two, a control rod, a branch plate, and a scraper, which facilitates the filter plate to filter the wastewater. At the same time, the scraper is linked to control the rotation, so that the scraper can clean the impurities on the surface of the filter plate, which helps to continuously treat the wastewater.

[0017] (3) The multi-stage treatment equipment for waste mineral oil purification wastewater is equipped with a fixed cylinder, an air inlet pipe, a side pipe, an aeration pipe and an aeration hole. This allows for easy control of the centrifugal rod rotation, which causes the aeration pipe to rotate and discharge airflow, making it less likely for impurities to accumulate at the bottom of the sedimentation cylinder and improving the treatment effect.

[0018] (4) The multi-stage treatment equipment for waste mineral oil purification wastewater is equipped with side blocks, rotating rods, rotating blocks, inclined plates, guide blocks, abutment rods, protrusions and springs, which facilitates the installation of pipes and control the repeated swinging of the discharge pipe when the pipes rotate, thereby improving the uniformity of demulsifier distribution. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional perspective view of the present invention; Figure 3 This is a cross-sectional perspective view of the sedimentation cylinder in this invention; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 for Figure 3 Enlarged view of point B in the middle; Figure 6 This is a partial three-dimensional structural diagram of the processing unit in this invention; Figure 7 for Figure 6 Enlarged view of point C in the middle; Figure 8 This is a cross-sectional perspective view of the filter cartridge in this invention.

[0020] In the diagram: 1. Sedimentation tank; 2. Disinfection tank; 3. Fixed pipe; 4. Filter cylinder; 5. Water pump; 6. Connecting pipe; 7. Treatment unit; 8. Feed pipe; 9. Motor; 10. Conveying pipe; 11. Outlet pipe; 12. Chemical inlet pipe; 13. Chemical inlet hopper; 71. Rotary pipe one; 72. Rotary roller; 73. Centrifugal rod; 74. Rotary pipe two; 75. Aeration pipe; 76. Aeration hole; 77. Gear one; 78. Rotating shaft; 79. Gear two; 710. Fan blade one; 711. Fixed cylinder one; 712. Air inlet pipe; 713. Feeding pipe; 714. Output. 715. Pipe; 716. Guide plate one; 717. Guide block one; 718. Side block; 719. Mounting bracket; 720. Installation pipe; 721. Discharge pipe; 722. Branch pipe; 723. Protrusion; 724. Fixing cover; 725. Rotating rod; 726. Rotating block; 727. Inclined plate; 728. Guide plate two; 729. Support rod; 730. Spring; 731. Fixing block; 732. Filter plate; 733. Fixing cylinder two; 734. Control rod; 735. Fan blade two; 736. Side pipe; 737. Branch plate; 738. Scraper. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] This invention provides the following technical solutions: Example

[0023] Please see Figure 1 - Figure 7A multi-stage treatment device for purifying wastewater from waste mineral oil includes a sedimentation tank 1 and a disinfection tank 2. A fixed pipe 3 is fixedly connected to the upper side of the disinfection tank 2, and a filter cylinder 4 is fixedly connected to the upper end of the fixed pipe 3. A feed pipe 8 and a motor 9 are fixedly connected to the upper side of the sedimentation tank 1. A treatment unit 7 is provided on the sedimentation tank 1 and the filter cylinder 4. The treatment unit 7 includes a rotating pipe 71, which is rotatably connected to the inner side of the sedimentation tank 1. A rotating roller 72 is fixedly connected to the lower end of the rotating pipe 71, and multiple centrifugal rods 73 are fixedly connected to the outer side of the rotating roller 72. A guide plate 715 is fixedly connected to the inner side of the sedimentation tank 1, and a guide block 716 is slidably connected to the outer side of the guide plate 715. A side block 717 is fixedly connected to the outer side of the guide block 716, and an installation pipe 719 is provided on the outer side of the side block 717. Multiple discharge pipes 720 are fixedly connected to the outer side of the installation pipe 719.

[0024] A water pump 5 is fixedly connected to the left side of the disinfection tank 2. A connecting pipe 6 is fixedly connected between the water pump 5 and the sedimentation tank 1. A conveying pipe 10 is fixedly connected between the water pump 5 and the filter cylinder 4. An outlet pipe 11 and a chemical inlet pipe 12 are fixedly connected to the right side of the disinfection tank 2. A chemical inlet hopper 13 is fixedly connected to the upper end of the chemical inlet pipe 12. A valve is installed on the outside of the outlet pipe 11. An installation bracket 718 is fixedly connected between the rotating pipe 71 and the guide block 716. A branch pipe 721 is fixedly connected between the installation pipe 719 and the rotating pipe 71. A fixed cylinder 711 is fixedly connected to the upper side of the sedimentation tank 1. A feeding pipe 713 is fixedly connected to the upper side of the fixed cylinder 711. The lower end of the feeding pipe 713 is located inside the rotating pipe 71. A fixed connection is installed on the outer side of the rotating pipe 71. A gear 77 is connected to the sedimentation tank 1, and a rotating shaft 78 is rotatably connected to the inner side of the sedimentation tank 1. A gear 79 that meshes with the gear 77 is fixedly connected to the outer side of the rotating shaft 78. The output end of the motor 9 is fixedly connected to the upper end of the rotating shaft 78. When treating wastewater, the wastewater is first fed into the inner side of the sedimentation tank 1 through the feed pipe 8. The wastewater is demulsified by the internal treatment unit 7, and the water pump 5 is started. Under the action of the connecting pipe 6 and the conveying pipe 10, the wastewater is passed into the filter tank 4 for filtration. Then, the wastewater is passed into the disinfection tank 2 through the fixed pipe 3, and the disinfectant is added into the disinfection tank 2 through the inlet hopper 13 and the inlet pipe 12 to disinfect the wastewater. Finally, the treated wastewater is discharged through the outlet pipe 11.

[0025] Branch pipe 721 is made of flexible hose. When demulsification is required, motor 9 is started, which drives shaft 78 to rotate. Shaft 78 drives gear 2 79 to rotate, gear 2 79 drives gear 1 77 to rotate, gear 1 77 drives rotating pipe 1 71 to rotate, rotating pipe 1 71 drives rotating roller 72 to rotate, and rotating roller 72 drives centrifugal rod 73 to rotate. This facilitates the centrifugal rod 73 to stir the wastewater, causing the oil, water, and solid phases with different densities to separate. At this time, demulsifier is added to rotating pipe 1 71 through feeding pipe 713. Then, the demulsifier is discharged into the wastewater through multiple branch pipes 721 and installation pipe 719, and multiple discharge pipes 720. The demulsifier is evenly distributed on the inside of the wastewater. With the help of stirring, the demulsifier treats the emulsified oil in the wastewater, preventing the emulsified oil from being directly filtered and clogging the filter components.

[0026] A fixed cylinder 733 is fixedly connected to the upper side of the filter cylinder 4. A control rod 734 is rotatably connected to the inner side of the fixed cylinder 733. Multiple fan blades 735 are fixedly connected to the outer side of the control rod 734. An output pipe 714 is fixedly connected between the fixed cylinder 711 and the fixed cylinder 733. Multiple branch plates 737 are fixedly connected to the lower end of the control rod 734. A scraper 738 is fixedly connected to the lower side of the branch plate 737. A filter plate 732 is fixedly connected to the inner side of the filter cylinder 4 and below the scraper 738. An air inlet pipe 712 is fixedly connected to the left side of the fixed cylinder 711. An air inlet pipe 712 is fixedly connected to the outer side of the rotating pipe 71 and below the scraper 738. Multiple fan blades 710 are fixedly connected to the inner side of the fixed cylinder 711. When the filter plate 732 filters wastewater, the rotating pipe 71 drives the fan blades 710 to rotate. Through the air inlet pipe 712, the external airflow enters the fixed cylinder 711 and flows into the fixed cylinder 733 through the outlet pipe 714. The airflow drives the fan blades 735 to rotate. The fan blades 735 drive the control rod 734 to rotate. The control rod 734 drives the branch plate 737 to rotate. The branch plate 737 drives the scraper 738 to rotate, so that the scraper 738 agitates the impurities on the filter plate 732 and prevents the filter plate 732 from clogging.

[0027] A rotating pipe 74 is fixedly connected to the lower side of the rotating roller 72. The rotating pipe 74 is rotatably connected to the sedimentation cylinder 1. Multiple aeration pipes 75 are fixedly connected to the outer side of the rotating pipe 74. Multiple aeration holes 76 are opened on the outer side of the aeration pipes 75. A side pipe 736 is fixedly connected between the fixed cylinder 733 and the sedimentation cylinder 1. The side pipe 736 is connected to the rotating pipe 74. During wastewater treatment, the airflow is delivered to the side pipe 736 through the fixed cylinder 733. The airflow is discharged to the bottom of the sedimentation cylinder 1 through the multiple aeration pipes 75 and aeration holes 76 through the rotating pipe 74. The rotation of the aeration pipes 75 is controlled to stir up the impurities deposited at the bottom, preventing the impurities from settling together and improving the treatment effect. Example

[0028] Based on Example 1, such as Figure 6- Figure 8 As shown, a rotating rod 724 is rotatably connected to the outer side of the side block 717. The rotating rod 724 is fixedly connected to the mounting tube 719. A rotating block 725 is fixedly connected to the outer end of the rotating rod 724. An inclined plate 726 is rotatably connected to the outer side of the rotating block 725. A guide plate 727 is fixedly connected to the upper side of the mounting frame 718. A guide block 728 is slidably connected to the outer side of the guide plate 727. The guide block 728 is rotatably connected to the inclined plate 726. A stop rod 729 is fixedly connected to the outer side of the guide block 728. Multiple protrusions 722 are fixedly connected to the inner side of the sedimentation cylinder 1. The stop rod 729 abuts against the protrusions 722. A fixing block 731 is fixedly connected to the upper side of the mounting frame 718. A spring 730 is fixedly connected between block 731 and guide block 728. A fixing cover 723 is fixedly connected to the outside of the mounting bracket 718. When the mounting tube 719 rotates, the mounting bracket 718 drives the abutment rod 729 to rotate. Under the action of the protrusion 722, the abutment rod 729 moves back and forth repeatedly. The abutment rod 729 drives guide block 728 to move. Guide block 728 drives inclined plate 726 to rotate. Inclined plate 726 drives rotating block 725 to swing repeatedly. Rotating block 725 drives rotating rod 724 to rotate. Rotating rod 724 drives mounting tube 719 to swing repeatedly. Mounting tube 719 drives discharge tube 720 to swing repeatedly, further improving the uniformity of demulsifier distribution.

[0029] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0030] Working Principle: During operation, wastewater is fed into the inner side of the sedimentation tank 1 through the feed pipe 8. The motor 9 is started, driving gear 2 79 to rotate, which in turn drives gear 1 77 to rotate. Gear 1 77 drives rotating pipe 1 71, which in turn drives centrifugal rod 73 to rotate, causing the centrifugal rod 73 to agitate the wastewater and treat the emulsified oil. Simultaneously, demulsifier is fed into rotating pipe 1 71 through the feed pipe 713. Through branch pipe 721 and installation pipe 719, the demulsifier is discharged into the wastewater through discharge pipe 720. The installation pipe 719 is rotated, and the rotating rod 724, rotating block 725, and inclined plate 72... 6. Under the action of guide block 728, push rod 729 and protrusion 722, the installation pipe 719 is repeatedly oscillated to further improve the uniformity of demulsifier distribution. Then, the water pump 5 is started. Under the action of connecting pipe 6 and conveying pipe 10, the demulsified wastewater is passed into the inner side of filter cylinder 4, so that filter plate 732 filters the wastewater. At the same time, rotating pipe 71 drives fan blade 710 to rotate, so that airflow enters fixed cylinder 733 and drives fan blade 735 to rotate. Under the action of control rod 734, branch plate 737 and scraper 738, scraper 738 rotates to clean the impurities on the surface of filter plate 732. Finally, the wastewater is disinfected through disinfection tank 2.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage treatment device for purifying wastewater from waste mineral oil, comprising a sedimentation tank (1) and a disinfection tank (2), characterized in that: A fixed pipe (3) is fixedly connected to the upper side of the disinfection tank (2), and a filter cylinder (4) is fixedly connected to the upper end of the fixed pipe (3). A feed pipe (8) and a motor (9) are fixedly connected to the upper side of the sedimentation cylinder (1). A processing unit (7) is provided on the sedimentation cylinder (1) and the filter cylinder (4). The processing unit (7) includes a rotating pipe (71), which is rotatably connected to the inner side of the sedimentation cylinder (1). The lower end of the rotating pipe (71) is fixedly connected to a rotating... Roller (72), a plurality of centrifugal rods (73) are fixedly connected to the outer side of the roller (72), a guide plate (715) is fixedly connected to the inner side of the sedimentation cylinder (1), a guide block (716) is slidably connected to the outer side of the guide plate (715), a side block (717) is fixedly connected to the outer side of the guide block (716), an installation pipe (719) is provided on the outer side of the side block (717), and a plurality of discharge pipes (720) are fixedly connected to the outer side of the installation pipe (719).

2. The multi-stage treatment equipment for purifying wastewater from waste mineral oil according to claim 1, characterized in that: A water pump (5) is fixedly connected to the left side of the disinfection tank (2). A connecting pipe (6) is fixedly connected between the water pump (5) and the sedimentation tank (1). A conveying pipe (10) is fixedly connected between the water pump (5) and the filter tank (4). An outlet pipe (11) and a medicine inlet pipe (12) are fixedly connected to the right side of the disinfection tank (2). A medicine inlet hopper (13) is fixedly connected to the upper end of the medicine inlet pipe (12). A valve is provided on the outside of the outlet pipe (11).

3. The multi-stage treatment equipment for purifying wastewater from waste mineral oil according to claim 1, characterized in that: A mounting bracket (718) is fixedly connected between the first rotating tube (71) and the first guide block (716). A branch pipe (721) is fixedly connected between the mounting pipe (719) and the first rotating tube (71). A fixed cylinder (711) is fixedly connected to the upper side of the sedimentation cylinder (1). A feeding pipe (713) is fixedly connected to the upper side of the fixed cylinder (711). The lower end of the feeding pipe (713) is located inside the first rotating tube (71).

4. The multi-stage treatment equipment for purifying wastewater from waste mineral oil according to claim 1, characterized in that: Gear 1 (77) is fixedly connected to the outside of the rotating tube 1 (71), and a rotating shaft (78) is rotatably connected to the inside of the sedimentation cylinder (1). Gear 2 (79) that meshes with gear 1 (77) is fixedly connected to the outside of the rotating shaft (78), and the output end of the motor (9) is fixedly connected to the upper end of the rotating shaft (78).

5. The multi-stage treatment equipment for purifying wastewater from waste mineral oil according to claim 4, characterized in that: The upper side of the filter cylinder (4) is fixedly connected to a second fixed cylinder (733), the inner side of the second fixed cylinder (733) is rotatably connected to a control rod (734), the outer side of the control rod (734) is fixedly connected to multiple second fan blades (735), the first fixed cylinder (711) and the second fixed cylinder (733) are fixedly connected to an output pipe (714), the lower end of the control rod (734) is fixedly connected to multiple branch plates (737), the lower side of the branch plate (737) is fixedly connected to a scraper (738), the inner side of the filter cylinder (4) and below the scraper (738) is fixedly connected to a filter plate (732), the left side of the first fixed cylinder (711) is fixedly connected to an air inlet pipe (712), the outer side of the first rotating pipe (71) and the inner side of the first fixed cylinder (711) is fixedly connected to multiple first fan blades (710).

6. A multi-stage treatment device for purifying wastewater from waste mineral oil according to claim 5, characterized in that: The lower side of the rotating roller (72) is fixedly connected to the rotating tube (74), the rotating tube (74) is rotatably connected to the sedimentation cylinder (1), and a plurality of aeration pipes (75) are fixedly connected to the outer side of the rotating tube (74). A plurality of aeration holes (76) are opened on the outer side of the aeration pipes (75). A side pipe (736) is fixedly connected between the fixed cylinder (733) and the sedimentation cylinder (1), and the side pipe (736) is connected to the rotating tube (74).

7. A multi-stage treatment device for purifying wastewater from waste mineral oil according to claim 3, characterized in that: A rotating rod (724) is rotatably connected to the outer side of the side block (717). The rotating rod (724) is fixedly connected to the mounting tube (719). A rotating block (725) is fixedly connected to the outer end of the rotating rod (724). An inclined plate (726) is rotatably connected to the outer side of the rotating block (725). A guide plate (727) is fixedly connected to the upper side of the mounting bracket (718). A guide block (728) is slidably connected to the outer side of the guide plate (727). The guide block (728) is rotatably connected to the inclined plate (726). A stop rod (729) is fixedly connected to the outer side of the guide block (728). A plurality of protrusions (722) are fixedly connected to the inner side of the sedimentation cylinder (1).

8. A multi-stage treatment device for purifying wastewater from waste mineral oil according to claim 7, characterized in that: The abutment (729) abuts against the protrusion (722), a fixing block (731) is fixedly connected to the upper side of the mounting bracket (718), a spring (730) is fixedly connected between the fixing block (731) and the guide block (728), and a fixing cover (723) is fixedly connected to the outer side of the mounting bracket (718).

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