CN114163044A

CN114163044A - Oily wastewater treatment device applying membrane technology

Info

Publication number: CN114163044A
Application number: CN202111459429.3A
Authority: CN
Inventors: 曹泽琦
Original assignee: Suzhou Dongdaren Smart Tech Co ltd
Current assignee: Suzhou Dongdaren Smart Tech Co ltd
Priority date: 2021-12-02
Filing date: 2021-12-02
Publication date: 2022-03-11
Anticipated expiration: 2041-12-02
Also published as: CN114163044B

Abstract

The invention discloses an oily wastewater treatment device applying a membrane technology, and relates to the technical field of wastewater treatment devices. The invention adopts the mutual matching arrangement of the plurality of components, not only can pretreat sewage in sewage to clean grease and impurities floating on the surface of the sewage, promote the filtering process, guide the sewage in the sewage tank into the aeration tank through preliminary filtering by the communicating component, promote the filtering effect through aeration treatment, and lead pollutants in the sewage not to be in direct contact with the filter element through the arrangement of the internal filtering component of the dynamic membrane filter, thereby ensuring the long-term use of the filter element, and lead the dynamic membrane pump pipe to automatically peel off the surface of the filtering layer through the circulating coating component, thereby relieving the situation that the sewage is blocked by the detection.

Description

Oily wastewater treatment device applying membrane technology

Technical Field

The invention relates to the technical field of wastewater treatment devices, in particular to an oily wastewater treatment device applying a membrane technology.

Background

The membrane separation is a method for separating, classifying, purifying and enriching a gas or liquid with two or more components by using the difference of selective permeation of each component in a mixture through a membrane and taking external energy or chemical potential as driving force. At present, the membrane separation techniques that have been put into practical use mainly include microfiltration, ultrafiltration, nanofiltration, reverse osmosis, electrodialysis, dialysis, gas membrane separation, and the like. These membrane technologies are widely used in medical, food, metallurgical, petroleum, chemical, instrumentation, and water treatment applications. The research and application of the membrane technology in the treatment of the oily wastewater are quite extensive, the treatment is mainly carried out by adopting ultrafiltration membranes and microfiltration membranes made of different materials, the source of the oily wastewater is very wide, and all water directly contacted with oil contains oil, such as produced water of petroleum, cold-rolled emulsion wastewater of steel plants, oily wastewater in petrochemical production, lubricant wastewater for metal cutting and grinding, cleaning wastewater of metal surfaces, ballast water of oil tankers, tank washing water and the like. If the waste water is directly discharged without being treated, the environment is seriously polluted.

Oily wastewater treatment device on the market has the filtration incomplete, and the preliminary treatment in the effluent water sump is not enough simultaneously, leads to grease and impurity that exist in the oily waste water to remain easily, and then is infected with on filtering a piece surface, arouses the jam of filtering a piece, leads to the low influence process of filtration efficiency.

Disclosure of Invention

The present invention is directed to an apparatus for treating oily wastewater using membrane technology to solve the above problems of the background art.

In order to achieve the purpose, the invention provides the following technical scheme: an oily wastewater treatment device applying a membrane technology comprises a sewage tank and a filtering component, wherein a water inlet is formed in the top of the sewage tank, a pretreatment component is installed in the sewage tank, an aeration tank is arranged on one side of the sewage tank, an aeration pipe is installed in the aeration tank, an air inlet pipe is arranged on one side of the aeration pipe, a pressure pump is installed at the top of the aeration tank, the other side of the pressure pump is connected with a dynamic membrane filter, a circulating film coating component is arranged on the right side of the dynamic membrane filter, the pretreatment component comprises a rotating motor, a driving wheel set, a cleaning belt, a baffle, a groove, an elastic support and an adsorption film, the output end of the rotating motor is connected with the driving wheel set, the cleaning belt is arranged outside the driving wheel set, the baffle is fixedly connected to the surface of the cleaning belt, and the groove is formed in the surface of the baffle, the groove is connected with the elastic support in a clamping mode, the adsorption film is arranged inside the elastic support, and the filtering component is installed inside the dynamic film filter.

Preferably, the pretreatment assembly further comprises a retention box, a filtering grid, an airtight door and a return pipe, the retention box is installed on the left side of the sewage pool, the filtering grid is installed inside the retention box, the airtight door is connected to the bottom of the retention box in a sliding mode, and the return pipe is arranged on the inner side of the retention box.

Preferably, effluent water sump internally mounted has the compression subassembly, just the compression subassembly is including bearing frame, hydraulic stem, pressure filter plate, electric telescopic handle and push pedal, bear frame internally mounted have the hydraulic stem, just the hydraulic stem output is connected with the pressure filter plate, the inside both sides of pressure filter plate all are connected with electric telescopic handle, just the electric telescopic handle output is connected with the push pedal.

Preferably, aeration tank internally mounted has the intercommunication subassembly, just the intercommunication subassembly includes communicating pipe, mount, active adsorption fibre, filtration membrane and rigidity ball, all install communicating pipe outer end the mount, just mount surface cup joints active adsorption fibre, mount inner wall is provided with filtration membrane, just inside the placing has placed the rigidity ball.

Preferably, the placement frames are symmetrically distributed about the center position of the communicating pipe, and the placement frames are of spherical structures.

Preferably, the circulating coating assembly comprises a coating agent tank, a coating water tank, a driving pump, a conducting pipe, a circulating pipe and a circulating pump, wherein the coating water tank is connected to one side of the coating agent tank, the driving pump is installed at the top of the coating water tank, the circulating pipe is arranged outside the driving pump, and the circulating pump is arranged in the middle of the circulating pipe.

Preferably, the filtering component comprises a filtering frame, a blocking disc, an adsorption surface, a slot and a filter element, the blocking disc is installed at the top of the filtering frame, the slot is formed in the surface of the blocking disc, and the filter element is installed inside the slot.

Preferably, the filtering component further comprises a servo motor, a gear, a convex gear, a straight rod, a rotating shaft and a sweeping plate, the servo motor is installed right above the filtering frame, the output end of the servo motor is connected with the gear, the convex gear is connected to the outer portion of the gear in an engaged mode, the straight rod penetrates through the convex gear, the rotating shaft is arranged at the bottom of the straight rod, and the sweeping plate is arranged on the outer portion of the straight rod.

Preferably, the sweeping plate is in transmission connection with the gear through the straight rod, the sweeping plates are symmetrically distributed about the center of the straight rod, and the straight rod is in elastic rotation connection with the filter frame through the rotating shaft.

Preferably, the top of the dynamic membrane filter is provided with a flushing port, the bottom of the dynamic membrane filter is connected with a precision safety filter, and the bottom of the precision safety filter is connected with a water outlet pipe.

The invention provides an oily wastewater treatment device applying a membrane technology, which has the following beneficial effects: the oily wastewater treatment device applying the membrane technology adopts the mutual matching arrangement among the plurality of components, not only can pretreat sewage in sewage, clean grease and impurities floating on the surface of the sewage, promote the filtration process, and guide the sewage in a sewage tank into an aeration tank through preliminary filtration by the communicating component, can promote the filtration effect through aeration treatment, and can ensure that pollutants in the sewage do not directly contact with a filter element through the arrangement of the internal filtering component of the dynamic membrane filter, thereby ensuring the long-term use of the filter element, and leading a dynamic membrane pump pipe to automatically strip a filter layer membrane surface through the circulating film coating component, and relieving the situation that the sewage is blocked;

1. according to the invention, through the mutual matching arrangement between the sewage tank and the pretreatment assembly, when sewage is guided into the sewage tank from the water inlet, the driving wheel set and the cleaning belt can be driven to synchronously rotate under the driving of the rotating motor, and then the adsorption film in the separation blade on the outer surface of the cleaning belt is matched, so that oil stain floaters on the surface of the sewage can be removed in the rotating process, large floaters can be guided into the retention box along with the rotation of the adsorption film, the sewage which enters together returns into the sewage tank again through the return pipe, the adsorption film is connected with the groove on the surface of the separation blade through the clamping of the elastic support, the later maintenance and replacement of the adsorption film are convenient, and the airtight door is opened by sliding after the adsorption film is used for a period of time, so that the internal dirt is taken out.

2. According to the invention, the sewage tank, the communication assembly and the aeration tank are matched with each other, so that the communication pipe penetrates through the two ends of the sewage tank and the aeration tank, sewage is filtered by the spherical mounting frame and the active adsorption fibers, the filtering process of the sewage can be further improved by the microfiltration membrane on the inner wall of the mounting frame, the rigid ball is placed in the mounting frame, the situation that the mounting frame is greatly deformed due to external force collision to influence the filtering work can be avoided, sediment in the sewage tank 1 can be squeezed by the squeezing assembly, the squeezed sewage is discharged through the sewage pipe on one side, and the remaining dried sludge is taken out through the sewage discharge outlet on the bottom of the mounting frame, so that the cleaning process is facilitated.

3. According to the invention, through the mutual matching arrangement of the circulating film coating assembly and the dynamic film filter, the film coating agent can be guided into the film coating water tank by the film coating agent tank, the internal film can be introduced into the dynamic film filter under the working of the pressure pump, so that the dynamic film can automatically peel off the film surface of the filter layer, a new filter layer film surface is formed, the blockage problem is thoroughly solved, the practicability of the dynamic film filter is improved, the circulating film coating process can be carried out on the interior of the dynamic film filter through the circulating pump, and the film coating rate of the dynamic film filter is improved.

4. According to the invention, through the mutual matching arrangement of the filtering component and the dynamic membrane filter, the filtering frame in the filtering component is arranged in the dynamic membrane filter, the external size of the baffle disc at the top of the filtering frame is larger than that of the filtering frame, the baffle disc takes the aluminum oxide with different apertures as the supporting body, and the adsorption surface is the zr02 tubular ceramic membrane, so that the maximum interception rate and the minimum membrane pollution can be obtained, further, the pollutants in the sewage can not be in direct contact with the filter element, the long-term use of the filter element is ensured, and the defects of easy blockage and short service life of the filter element in the filter element are overcome.

5. According to the invention, through the arrangement of the filtering component, the gear can be driven to rotate under the driving of the servo motor, the rotating gear can drive the convex gear meshed with the gear to further drive the straight rod to rotate locally, the rotating straight rod can drive the sweeping plate on the surface to sweep the surface of the filter element, so that contaminants on the surface of the filter element can be further removed, the service cycle of the filter element is prolonged, water subjected to multiple treatments enters the precision safety filter for secondary filtering and then is discharged, and the filtering quality of the filter element is improved.

Drawings

FIG. 1 is a schematic view showing the overall structure of an oily wastewater treatment apparatus using membrane technology according to the present invention;

FIG. 2 is a schematic view showing the structure of a sewage tank of an oily wastewater treatment apparatus using membrane technology according to the present invention;

FIG. 3 is a schematic diagram of a side view of a baffle plate of an oily wastewater treatment device applying membrane technology;

FIG. 4 is a schematic structural view of a circulating membrane module of an oily wastewater treatment device applying membrane technology according to the present invention;

FIG. 5 is a schematic view of the internal structure of a circulating membrane module of an oily wastewater treatment device applying membrane technology according to the present invention;

FIG. 6 is a schematic top view of a filter rack of an oily wastewater treatment device using membrane technology according to the present invention;

FIG. 7 is a schematic view showing the structure of a communicating member of an apparatus for treating oily wastewater using membrane technology according to the present invention.

In the figure: 1. a sewage tank; 2. a water inlet; 3. a pre-processing assembly; 301. rotating the motor; 302. a driving wheel set; 303. a cleaning belt; 304. a baffle plate; 305. a groove; 306. an elastic support; 307. an adsorption film; 308. a retention box; 309. filtering the grating; 310. an airtight door; 311. a return pipe; 4. an aeration tank; 5. an aeration pipe; 6. an air inlet pipe; 7. a pressure pump; 8. a dynamic membrane filter; 9. circulating the film coating assembly; 901. coating agent can; 902. a film coating water tank; 903. a pressure pump; 904. a conduction pipe; 905. a circulation pipe; 906. a circulation pump; 10. a filter assembly; 1001. a filter frame; 1002. a catch tray; 1003. an adsorption surface; 1004. a slot; 1005. a filter element; 1006. a servo motor; 1007. a gear; 1008. a convex gear; 1009. a straight rod; 1010. a rotating shaft; 1011. sweeping the board; 11. a press assembly; 1101. a carrier; 1102. a hydraulic lever; 1103. pressing the filter plate; 12. a communicating component; 1201. a communicating pipe; 1202. a placement frame; 1203. active adsorption fiber; 1204. a filtration membrane; 1205. a rigid ball; 13. flushing the opening; 14. a precision safety filter; 15. and (5) discharging a water pipe.

Detailed Description

Referring to fig. 1-7, the present invention provides a technical solution: an oily wastewater treatment device applying a membrane technology comprises a sewage tank 1 and a filtering component 10, wherein a water inlet 2 is arranged at the top of the sewage tank 1, a pretreatment component 3 is arranged in the sewage tank 1, an aeration tank 4 is arranged on one side of the sewage tank 1, an aeration pipe 5 is arranged in the aeration tank 4, an air inlet pipe 6 is arranged on one side of the aeration pipe 5, a pressure pump 7 is arranged at the top of the aeration tank 4, the other side of the pressure pump 7 is connected with a dynamic membrane filter 8, a circulating coating component 9 is arranged on the right side of the dynamic membrane filter 8, the pretreatment component 3 comprises a rotating motor 301, a driving wheel set 302, a cleaning belt 303, a baffle plate 304, a groove 305, an elastic support 306 and an adsorption membrane 307, the output end of the rotating motor 301 is connected with the driving wheel set 302, the cleaning belt 303 is arranged outside the driving wheel set 302, the surface of the cleaning belt 303 is fixedly connected with the baffle plate 304, and the surface of the baffle plate 304 is provided with the groove 305, an elastic support 306 is connected with the inside of the groove 305 in a clamping manner, an adsorption film 307 is arranged inside the elastic support 306, the filtering component 10 is installed inside the dynamic film filter 8, a flushing port 13 is arranged at the top of the dynamic film filter 8, the bottom of the dynamic film filter 8 is connected with a precision safety filter 14, and the bottom of the precision safety filter 14 is connected with a water outlet pipe 15;

referring to fig. 1-3, the pretreatment module 3 further includes a retention tank 308, a filter grid 309, an airtight door 310 and a return pipe 311, the retention tank 308 is installed on the left side of the wastewater tank 1, the filter grid 309 is installed inside the retention tank 308, the airtight door 310 is slidably connected to the bottom of the retention tank 308, the return pipe 311 is installed inside the retention tank 308, the squeezing module 11 is installed inside the wastewater tank 1, the squeezing module 11 includes a bearing frame 1101, a hydraulic rod 1102 and a filter pressing plate 1103, the hydraulic rod 1102 is installed inside the bearing frame 1101, and the output end of the hydraulic rod 1102 is connected with the filter pressing plate 1103;

the operation is as follows, through the mutual cooperation arrangement between the sewage pool 1 and the pretreatment module 3, when sewage is guided into the sewage pool 1 from the water inlet 2, the driving wheel set 302 and the cleaning belt 303 can be driven to synchronously rotate under the driving of the rotating motor 301, and then the adsorption film 307 in the baffle 304 on the outer surface of the cleaning belt 303 is matched, oil stain floating objects on the surface of the sewage can be removed in the rotating process, large floating objects can be guided into the retention box 308 along with the rotation of the floating film, the sewage entering together returns to the sewage pool 1 again through the return pipe 311, the adsorption film 307 is connected with the groove 305 on the surface of the baffle 304 through the clamping of the elastic bracket 306, so that the later maintenance and replacement are convenient, and the airtight door 310 is slid to open after the sewage pool is used for a period of time, so as to take out the internal sewage, the sediment 1103 in the sewage pool 1 can be squeezed through the hydraulic rod 1102 in the squeezing module 11 pushing the filter pressing plate, the squeezed sewage is discharged through a sewage pipe at one side, and the remaining dried sludge is taken out through a sewage discharge outlet at the bottom of the sewage pipe, so that the cleaning process is facilitated;

referring to fig. 1 and 4, the circulating film coating assembly 9 includes a film coating agent tank 901, a film coating water tank 902, a driving pump 903, a conducting pipe 904, a circulating pipe 905 and a circulating pump 906, wherein the film coating agent tank 902 is connected to one side of the film coating agent tank 901, the driving pump 903 is installed on the top of the film coating water tank 902, the circulating pipe 905 is arranged outside the driving pump 903, and the circulating pump 906 is arranged in the middle of the circulating pipe 905;

the specific operation is as follows, through the mutual matching arrangement between the circulating film coating assembly 9 and the dynamic film filter 8, the film coating agent can be guided into the film coating water tank 902 by the film coating agent tank 901, the internal film can be introduced into the dynamic film filter 8 under the operation of the pressure pump 903, and then the dynamic film can automatically strip the filter layer film surface without any pipe, so as to form a new filter layer film surface, thoroughly solve the blocking problem, improve the practicability, and can perform the circulating film coating process on the interior of the dynamic film filter 8 by the circulating pump 906, and improve the film coating rate;

referring to fig. 1, 5 and 6, the filter assembly 10 includes a filter rack 1001, a baffle plate 1002, a suction surface 1003, a slot 1004 and a filter core 1005, the baffle plate 1002 is installed on the top of the filter rack 1001, and the surface of the baffle disc 1002 is provided with a slot 1004, the filter core 1005 is arranged inside the slot 1004, the filter assembly 10 further comprises a servo motor 1006, a gear 1007, a convex gear 1008, a straight rod 1009, a rotating shaft 1010 and a sweeping plate 1011, the servo motor 1006 is arranged right above the filter rack 1001, the output end of the servo motor 1006 is connected with a gear 1007, the gear 1007 is engaged and connected with a convex gear 1008, a straight rod 1009 penetrates through the convex gear 1008, a rotating shaft 1010 is arranged at the bottom of the straight rod 1009, the external of the straight rod 1009 is provided with a sweeping plate 1011, the sweeping plate 1011 forms a transmission connection with the gear 1007 through the straight rod 1009, the sweeping plate 1011 is symmetrically distributed around the center of the straight rod 1009, the straight rod 1009 is elastically and rotatably connected with the filter rack 1001 through a rotating shaft 1010;

the specific operation is as follows, through the mutual matching arrangement between the filtering component 10 and the dynamic membrane filter 8, the filtering rack 1001 in the filtering component 10 is arranged inside the dynamic membrane filter 8, and the external dimension of the baffle disc 1002 at the top of the filtering rack 1001 is larger than the external dimension of the filtering rack 1001, the baffle disc 1002 takes aluminum oxide with different apertures as a support body, and the adsorption surface 1003 is a zr02 tubular ceramic membrane, so that the maximum interception rate and the minimum membrane pollution can be obtained, further, the pollutants in the sewage can not be in direct contact with the filter element 1005, the long-term use of the filter element 1005 is ensured, the defects that the filter element 1005 is easy to block and has short service life are overcome, through the arrangement of the filtering component 10, the gear 1007 can be driven to rotate by the servo motor 1006, the rotating gear 1007 can drive the convex gear 1008 meshed therewith to drive the straight rod to partially rotate, the rotating straight rod 1011 can drive the sweeping plate 1009 on the surface to sweep the surface of the filter element 1005, and then can further clear away the contamination on filter element 1005 surface, prolong its filter element 1005 life cycle, the water after through multiple processing gets into precision cartridge filter 14 and filters once more, discharges afterwards, promotes its filtration quality.

Referring to fig. 1 and 7, a communication assembly 12 is installed inside an aeration tank 4, the communication assembly 12 includes a communication pipe 1201, a placement frame 1202, an active adsorption fiber 1203, a filter membrane 1204 and a rigid ball 1205, the placement frame 1202 is installed at the outer end of the communication pipe 1201, the active adsorption fiber 1203 is sleeved on the outer surface of the placement frame 1202, the filter membrane 1204 is installed on the inner wall of the placement frame 1202, the rigid ball 1205 is placed inside the placement frame 1202, the placement frames 1202 are symmetrically distributed about the center position of the communication pipe 1201, and the placement frame 1202 is in a spherical structure;

the concrete operation is as follows, through effluent water sump 1, the mutually supporting setting between intercommunication subassembly 12 and the aeration tank 4, make this communicating pipe 1201 run through to effluent water sump 1 and aeration tank 4 both ends, and filter sewage through spherical mount 1202 and active adsorption fibre 1203, and filtration membrane 1204 through mount 1202 inner wall can further promote its filtration process, rigid ball 1205 has been placed to this mount 1202 inside, make it can avoid mount 1202 to receive external force collision to lead to taking place the condition that great deformation influences filtering work, and can squeeze sediment in effluent water sump 1 through squeezing subassembly 11, sewage after squeezing is discharged through the sewage pipe of one side, and remaining mummified mud takes out through the drain of its bottom, make things convenient for it to clean the process.

To sum up, when the oily wastewater treatment device applying the membrane technology is used, firstly, sewage is guided into the sewage pool 1 through the water inlet 2, the driving wheel set 302 and the cleaning belt 303 can be driven to synchronously rotate under the driving of the rotating motor 301, and then the adsorption membrane 307 in the baffle 304 on the outer surface of the cleaning belt 303 is matched, oil stain floating objects on the surface of the sewage can be removed in the rotating process, large floating objects can be guided into the retention box 308 along with the rotation of the floating membrane, the sewage entering together returns to the sewage pool 1 again through the return pipe 311, the adsorption membrane 307 is conveniently maintained and replaced in the later period through the clamping connection of the elastic support 306 and the groove 305 on the surface of the baffle 304, the airtight door 310 is slid to open after the sewage is used for a period of time, so that the internal sewage is taken out, the sediment in the sewage pool 1 can be squeezed by pushing the filter pressing plate 1103 through the hydraulic rod 1102 in the pressing assembly 11, the squeezed sewage is discharged through a sewage pipe at one side, the residual dried sludge is taken out through a sewage discharge outlet at the bottom of the sewage pipe, the cleaning process is facilitated, then through the arrangement of the communicating component 12, the communicating pipe 1201 penetrates to the two ends of the sewage tank 1 and the aeration tank 4, the sewage is filtered through the spherical placing frame 1202 and the active adsorption fiber 1203, the filtering process can be further improved through the filtering membrane 1204 at the inner wall of the placing frame 1202, the rigid ball 1205 is placed in the placing frame 1202, the situation that the filtering work is influenced by large deformation caused by the impact of external force on the placing frame 1202 can be avoided, the primarily treated sewage is further led into the aeration tank 4, the secondarily treated sewage is led into the dynamic membrane filter 8 through the pressure pump 7, through the arrangement of the filtering component 10 in the dynamic membrane filter 8, the filtering frame 1001 in the filtering component 10 is placed in the dynamic membrane filter 8, the outer dimension of the baffle disc 1002 at the top of the filter rack 1001 is larger than that of the filter rack 1001, the baffle disc 1002 takes alumina with different apertures as a support body, the adsorption surface 1003 is a zr02 tubular ceramic membrane, so that the maximum rejection rate and the minimum membrane pollution can be obtained, further pollutants in sewage can not be in direct contact with the filter core 1005, the long-term use of the filter core 1005 is ensured, the defects that the filter core 1005 is easy to block and short in service life are overcome, through the arrangement of the filter assembly 10, the gear 1007 can be driven to rotate under the drive of the servo motor 1006, the rotating gear 1007 can drive the convex gear 1008 meshed with the gear to further drive the straight rod 1009 to locally rotate, the rotating straight rod 1009 can drive the sweeping plate 1011 on the surface to sweep the surface of the filter core 1005, further, contaminants on the surface of the filter core 1005 can be further removed, and the service cycle of the filter core 1005 is prolonged, water after multiple treatment enters the precision security filter 14 for secondary filtration, then is discharged, the filtration quality is improved, finally, sewage after multiple times of filtration enters the precision security filter 14 for secondary filtration and then is discharged through the water outlet pipe 15, the equipment is arranged through mutual matching between the circulating film coating assembly 9 and the dynamic membrane filter 8, the film coating agent tank 901 guides the film coating agent into the film coating water tank 902, the internal membrane can be introduced into the dynamic membrane filter 8 under the work of the pressure pump 903, and then the dynamic membrane pump pipe can automatically strip the filtration layer membrane surface, so that a new filtration layer membrane surface is formed, the blockage problem is thoroughly solved, the practicability is improved, the circulating film coating process can be carried out on the inside of the dynamic membrane filter 8 through the circulating pump 906, and the film coating rate is improved.

Claims

1. The oily wastewater treatment device applying the membrane technology is characterized by comprising a sewage tank (1) and a filtering assembly (10), wherein a water inlet (2) is formed in the top of the sewage tank (1), a pretreatment assembly (3) is installed in the sewage tank (1), an aeration tank (4) is arranged on one side of the sewage tank (1), an aeration pipe (5) is installed in the aeration tank (4), an air inlet pipe (6) is arranged on one side of the aeration pipe (5), a pressure pump (7) is installed on the top of the aeration tank (4), the other side of the pressure pump (7) is connected with a dynamic membrane filter (8), a circulating film coating assembly (9) is arranged on the right side of the dynamic membrane filter (8), and the pretreatment assembly (3) comprises a rotating motor (301), a driving wheel set (302), a cleaning belt (303), a baffle plate (304) and a baffle plate (304), The filter comprises a groove (305), an elastic support (306) and an adsorption film (307), wherein the output end of the rotating motor (301) is connected with the driving wheel set (302), the cleaning belt (303) is arranged outside the driving wheel set (302), the surface of the cleaning belt (303) is fixedly connected with the baffle sheet (304), the groove (305) is formed in the surface of the baffle sheet (304), the elastic support (306) is connected in the groove (305) in a clamping mode, the adsorption film (307) is arranged inside the elastic support (306), and the filter assembly (10) is installed inside the dynamic film filter (8).

2. The oily wastewater treatment device applying membrane technology as claimed in claim 1, wherein the pretreatment module (3) further comprises a retention tank (308), a filtering grid (309), an airtight door (310) and a return pipe (311), the retention tank (308) is installed at the left side of the sewage pool (1), the filtering grid (309) is installed inside the retention tank (308), the airtight door (310) is slidably connected to the bottom of the retention tank (308), and the return pipe (311) is installed inside the retention tank (308).

3. An oily wastewater treatment device applying membrane technology according to claim 1, characterized in that a squeezing assembly (11) is installed inside the wastewater treatment tank (1), the squeezing assembly (11) comprises a bearing frame (1101), a hydraulic rod (1102) and a filter pressing plate (1103), the hydraulic rod (1102) is installed inside the bearing frame (1101), and the filter pressing plate (1103) is connected to the output end of the hydraulic rod (1102).

4. The oily wastewater treatment device applying membrane technology as claimed in claim 1, wherein a communication component (12) is installed inside the aeration tank (4), the communication component (12) comprises a communication pipe (1201), a placement frame (1202), active adsorption fibers (1203), a filtering membrane (1204) and a rigid ball (1205), the placement frame (1202) is installed at the outer end of the communication pipe (1201), the active adsorption fibers (1203) are sleeved on the outer surface of the placement frame (1202), the filtering membrane (1204) is arranged on the inner wall of the placement frame (1202), and the rigid ball (1205) is placed inside the placement frame (1202).

5. The oily wastewater treatment device applying membrane technology as claimed in claim 4, wherein the placement frames (1202) are symmetrically distributed about the central position of the communicating pipe (1201), and the placement frames (1202) are of a spherical structure.

6. The oily wastewater treatment device applying the membrane technology as claimed in claim 1, wherein the circulating coating assembly (9) comprises a coating agent tank (901), a coating agent water tank (902), a driving pump (903), a conducting pipe (904), a circulating pipe (905) and a circulating pump (906), wherein the coating agent water tank (902) is connected to one side of the coating agent tank (901), the driving pump (903) is installed at the top of the coating agent water tank (902), the circulating pipe (905) is arranged outside the driving pump (903), and the circulating pump (906) is arranged in the middle of the circulating pipe (905).

7. The oily wastewater treatment device applying the membrane technology as claimed in claim 1, wherein the filter assembly (10) comprises a filter rack (1001), a baffle disc (1002), an adsorption surface (1003), a slot (1004) and a filter element (1005), the baffle disc (1002) is mounted on the top of the filter rack (1001), the slot (1004) is arranged on the surface of the baffle disc (1002), and the filter element (1005) is mounted inside the slot (1004).

8. The oily wastewater treatment device applying the membrane technology as claimed in claim 1, wherein the filtering assembly (10) further comprises a servo motor (1006), a gear (1007), a convex gear (1008), a straight rod (1009), a rotating shaft (1010) and a sweeping plate (1011), the servo motor (1006) is installed right above the filtering rack (1001), the gear (1007) is connected to the output end of the servo motor (1006), the convex gear (1008) is connected to the outside of the gear (1007) in a meshing manner, the straight rod (1009) penetrates through the inside of the convex gear (1008), the rotating shaft (1010) is arranged at the bottom of the straight rod (1009), and the sweeping plate (1011) is arranged outside the straight rod (1009).

9. The oily wastewater treatment device applying membrane technology as claimed in claim 8, characterized in that the sweeping plate (1011) is in transmission connection with the gear (1007) through the straight rod (1009), the sweeping plate (1011) is symmetrically distributed about the center position of the straight rod (1009), and the straight rod (1009) is in elastic rotation connection with the filter rack (1001) through the rotating shaft (1010).

10. The oily wastewater treatment device applying membrane technology as claimed in claim 1, characterized in that a flushing port (13) is arranged at the top of the dynamic membrane filter (8), a precision safety filter (14) is connected to the bottom of the dynamic membrane filter (8), and a water outlet pipe (15) is connected to the bottom of the precision safety filter (14).