Oily water treatment system applied to airport oil depot

Abstract

The utility model discloses an oil sewage treatment system applied to an airport oil depot, the sewage treatment system comprises a sewage primary treatment device, an oil-containing sewage treatment device and an effluent detection device, the effluent detection device discharges sewage with qualified oil stain detection into a domestic sewage pipeline, and the sewage primary treatment device is connected with the effluent detection device. And enabling the sewage with unqualified oil stain detection to flow back to the primary sewage treatment device through a pipeline. According to the oily sewage treatment system applied to the airport oil depot, oil in oily sewage can be effectively separated and removed, the resource use and treatment efficiency are optimized by accurately monitoring the oil contamination level, and meanwhile the stability and reliability of the oily sewage treatment system are guaranteed. According to the system, the burden on a subsequent domestic sewage treatment unit is reduced, the equipment abrasion and maintenance cost are reduced, the final water quality is ensured to meet the discharge standard, and the environment protection is facilitated.

Description

Technical Field

[0001] The present application relates to the field of sewage treatment, and in particular to an oily sewage treatment system used in an airport oil depot. Background Art

[0002] Treatment of oily wastewater from airport oil depots is a crucial component of airport environmental protection and water resource management. Due to the unique nature of airport oil depot operations, oily wastewater primarily originates from spills from loading and unloading equipment, equipment maintenance and cleaning, and rainwater washover of the work area. Discharge of this untreated oily wastewater can severely pollute surrounding water systems and the ecological environment.

[0003] At present, there are three main types of treatment facilities on the market for the oily wastewater quality of airport oil depots, which can be discharged into the domestic sewage pipeline after oil separation treatment. They are mobile oily wastewater treatment devices, mineral oil oil separators, and fixed complete sets of oily wastewater treatment devices. All three treatment devices directly treat oily wastewater. The above treatment devices have shortcomings in treating oily wastewater. The treatment devices have poor adaptability to fluctuations in flow and water quality, low oil-water separation efficiency, high maintenance costs, and poor stability of the overall oily wastewater treatment system, which is not conducive to the operation of subsequent treatment units (generally speaking, a domestic sewage treatment station will be set up at the end of the airport domestic sewage pipeline), thereby affecting the overall effect and safety of the entire airport sewage treatment. Secondly, the effluent treated by the oily wastewater treatment device is directly discharged into the domestic sewage pipeline. There is a lack of detection of the oil concentration of the effluent, and it is impossible to ensure whether the oil content of the sewage meets the requirements for discharge into the domestic sewage pipeline.

[0004] Therefore, how to provide a method for improving the treatment effect of an oily wastewater treatment device has become a technical problem that needs to be solved in this field. Utility Model Content

[0005] In view of this, the present application proposes an oily wastewater treatment system for use in airport oil depots.

[0006] According to the present application, an oily wastewater treatment system for airport oil depots is proposed, which includes a primary sewage treatment device, an oily sewage treatment device and an effluent detection device. The effluent detection device discharges sewage that passes the oil pollution detection into the domestic sewage pipe, and returns sewage that fails the oil pollution detection to the primary sewage treatment device through the pipe.

[0007] Preferably, the oily wastewater treatment device is independently arranged outside the sewage primary treatment device, and the oily wastewater treatment device is a mobile oily wastewater treatment device or a fixed oily wastewater treatment device.

[0008] Preferably, the primary sewage treatment device is a grease trap, which includes: a regulating area: the regulating area is arranged at the inlet end of the grease trap, and is used to temporarily store oily sewage and balance the water quality of the sewage; an oil separation area: the oil separation area is arranged in the middle of the grease trap, and the oil separation area preliminarily separates the oil and water in the oily sewage; and a lifting area: the lifting area is arranged at the outlet end of the grease trap, and is used to discharge sewage with a low oil content for the next step of sewage treatment.

[0009] Preferably, partition walls and low walls are provided between the adjustment area, the oil separation area and the lifting area of ​​the grease trap; an opening is provided at the bottom of the partition wall for connecting two adjacent areas; and the height of the low wall is higher than the opening of the partition wall.

[0010] Preferably, the oily wastewater treatment device is arranged inside the sewage primary treatment device, and the oily wastewater treatment device is a mineral oil separator.

[0011] Preferably, the primary sewage treatment device is a grease trap, which includes: a regulating area: the regulating area is arranged at the inlet end of the grease trap, and is used to temporarily store oily sewage and balance the water quality of sewage; an oil separation area: the oil separation area is arranged in the middle of the grease trap, and the oil separation area preliminarily separates the oil and water in the oily sewage; and a lifting area: the lifting area is arranged at the outlet end of the grease trap, and is used for sampling, testing, and distinguishing the system effluent for the next step of treatment; wherein, the mineral oil separator is arranged in the oil separation area, and the inlet and outlet of the oil separation area both pass through the mineral oil separator.

[0012] Preferably, partition walls are provided between the adjustment area, the oil separation area and the lifting area of ​​the oil separator, wherein a first partition wall is provided inside the adjustment area and an opening is provided at the bottom, and a first low wall higher than the opening of the first partition wall is provided in the adjustment area.

[0013] Preferably, a second partition wall is provided between the oil separation area and the regulating area, a third partition wall is provided between the oil separation area and the lifting area, and the mineral oil separator is provided between the second partition wall and the third partition wall.

[0014] Preferably, the mineral oil separator includes: an inlet arranged on the second partition wall, an outlet arranged on the third partition wall, and an oily wastewater separation device connected to the outlet end and fixed between the second partition wall and the third partition wall through the outlet end.

[0015] Preferably, a second low wall is provided between the second partition wall and the third partition wall, and the height of the second low wall is lower than the inlet of the sewage separation device.

[0016] Preferably, the lifting area includes: a sump and a sewage lifting device for collecting and transferring sewage.

[0017] The oily wastewater treatment system proposed in this application, applied to airport oil depots, effectively separates and removes oil from oily wastewater. By accurately monitoring oil contamination levels, it optimizes resource utilization and treatment efficiency, while also ensuring the stability and reliability of the oily wastewater treatment system. This system not only reduces the burden on subsequent domestic wastewater treatment units, lowering equipment wear and maintenance costs, but also ensures that the final water quality meets discharge standards, contributing to environmental protection.

[0018] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute part of this application, are used to provide a further understanding of the application, and the exemplary embodiments of the application and their descriptions are used to explain the application. In the accompanying drawings:

[0020] Figure 1 The figure is a flow chart of the oil wastewater treatment system according to the present application.

[0021] Figure 2 It is a top view of a sewage treatment system using a mobile oily sewage treatment device according to the present application.

[0022] Figure 3 It is a top view of a sewage treatment system using a fixed oily sewage treatment device according to the present application.

[0023] Figure 4 A top view of a sewage treatment system using a mineral oil grease separator according to the present application.

[0024] Figure 5 It is a cross-sectional view of the grease trap of the mobile oily wastewater treatment device and the fixed oily wastewater treatment device according to the present application.

[0025] Figure 6 A cross-sectional view of a sewage treatment system using a mineral oil grease separator according to the present application.

[0026] Figure 7 It is a cross-sectional view of a dual-purpose well using a fixed oily wastewater treatment device according to the present application.

[0027] Explanation of the numbers in the accompanying drawings: 1-mobile oily wastewater treatment device; 2-fixed oily wastewater treatment device; 3-regulation area; 4-oil separation area; 5-lifting area; 6-mineral oil oil separator; 7-first partition wall; 8-first low wall; 9-second partition wall; 10-third partition wall; 11-second low wall; 12-sump; 13-third low wall; 14-opening; 15-lifting pump; 16-lifting pipe; 17-water suction bell; 18-liquid level gauge; 19-air vent; 20-explosion-proof and fire-resistant breather cap; 21-manhole; 22-detection well; 23-buried extension rod elastic seat sealing gate valve; 24-water sealing well; 25-backflow preventer; 26-dual-purpose well; 27-primary discharge pipe; 28-backwash pipe; 29-valve well; 30-detection port; 61-inlet; 62-outlet; 63-sewage separation device. DETAILED DESCRIPTION

[0028] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and in combination with the implementation methods.

[0029] Airport oily wastewater primarily originates from the cleaning, refueling, and maintenance of aircraft and ground equipment. It often contains fuel, lubricants, hydraulic oil, and other oils, which are difficult to biodegrade and pose a significant environmental hazard. Due to its high oil content, direct treatment of this wastewater through sewage treatment plants can easily lead to pipe blockages or corrosion over time, increasing maintenance costs. Furthermore, the flow rate and water quality of wastewater discharged from airport oil depots are often unstable, impacting the stable operation of sewage treatment plants. Direct treatment of airport oil depot wastewater through sewage treatment plants increases the burden on these plants and results in poor treatment results.

[0030] like Figure 1-Figure 3 As shown, according to the present application, an oily wastewater treatment system for airport oil depots is proposed, which includes a sewage primary treatment device, an oily wastewater treatment device and an effluent detection device. The effluent detection device discharges the sewage that passes the oil pollution detection into the domestic sewage pipe, and returns the sewage that fails the oil pollution detection to the primary sewage treatment device through the pipe.

[0031] The above-mentioned primary sewage treatment device separates oil from water, balances the water quality of the sewage treatment system's influent, reduces the amount of oil entering the subsequent treatment device, and reduces the burden on the subsequent treatment device.

[0032] The above-mentioned oily wastewater treatment device further treats wastewater with less oil content so that the wastewater meets the standards for discharge into the domestic sewage network.

[0033] The above-mentioned effluent detection device detects whether the effluent from the oily wastewater treatment device meets the emission standards according to the "Comprehensive Sewage Discharge Standard" (GB8978-1996) and the "Petrochemical Industry Water Pollutant Discharge Standard" (GB 3551-2018), where the emission standard for oil substances in wastewater is usually 5 mg / L.

[0034] The oily wastewater treatment system proposed in this application removes large particles and oil products with a large density difference with water through physical means, thereby reducing the subsequent processing load; the oily wastewater treatment device further removes small-size oil droplets to ensure the water quality of the effluent; and cooperates with the effluent detection device to detect whether the water quality meets the standards for discharging domestic sewage pipe networks and determine the next step of the process.

[0035] According to one embodiment of the present application, the oily wastewater treatment device can be independently installed outside the primary sewage treatment device. This wastewater treatment device can be a mobile oily wastewater treatment device 1 or a fixed oily wastewater treatment device 2. The mobile oily wastewater treatment device 1 is suitable for emergency situations, adapting to changes in wastewater treatment locations or needs, and is easy to relocate. The fixed oily wastewater treatment device 2 is suitable for long-term, stable wastewater treatment needs, has a high wastewater treatment capacity, and can meet the wastewater treatment needs of large airports or fixed locations. The mobile oily wastewater treatment device 1 and the fixed oily wastewater treatment device 2 are commercially available oily wastewater treatment devices and can be selected as needed. The separate installation of the wastewater treatment device and the primary sewage treatment device separates the wastewater treatment stages, reducing the impact of oily wastewater on subsequent treatment units, ensuring stable operation of the oily wastewater treatment device, and extending the service life of the device or equipment. Furthermore, it can optimize the wastewater treatment effect at each stage and flexibly adjust the oily wastewater treatment system to adapt to seasonal changes or airport oil depot operations. It also makes repair and maintenance more convenient, ensuring the long-term operation of the oily wastewater treatment system.

[0036] The mobile oily wastewater treatment device 1 and the fixed oily wastewater treatment device 2 are conventional technologies and mainly comprise a pre-filter, a coalescing separator, and an adsorption filter. They utilize specific materials and unique structures to adsorb oil from wastewater.

[0037] The above-mentioned fixed oily wastewater treatment device 2 is a prior art device, which mainly includes a dosing device, an air flotation device and an oil-water separation device. It removes particulate matter and oil from wastewater through chemical flocculation, air flotation and oil-water separation.

[0038] To ensure the initial treatment of oily wastewater and reduce damage to oily wastewater treatment equipment, the primary wastewater treatment device can preferably be a grease trap. The grease trap can include: a conditioning zone 3, located at the inlet of the grease trap, for temporarily storing oily wastewater and balancing wastewater quality; an oil separator 4, located in the middle of the grease trap, for initially separating oil from water; and a lifting zone 5, located at the outlet of the grease trap, for discharging wastewater with less oil for further treatment. Airport oily wastewater is characterized by uneven discharge and high oil content. The conditioning zone 3 in the grease trap can mitigate this uneven discharge, preventing the impact of excessive wastewater flow or pollutant concentration on subsequent treatment equipment and affecting the stability of the wastewater treatment process. By utilizing the density difference between oil and water, the initial separation of oil and water can be achieved, reducing the burden on subsequent treatment equipment and improving the efficiency of oily wastewater treatment. The grease trap is easy to operate and maintain, low in cost, and does not require the addition of chemical additives, making it highly adaptable.

[0039] To effectively separate the oil and water in the oily wastewater, the oil separator tank preferably includes partition walls and low walls between the regulating zone 3, the oil separator zone 4, and the lifting zone 5. These include a first partition wall 7 and a first low wall 8 between the regulating zone 3 and the oil separator zone 4, a second partition wall 9 and a second low wall 11 between the oil separator zone 4 and the lifting zone 5, and a third low wall 13 within the lifting zone 5. Each partition wall has an opening 14 at its bottom for connecting the two adjacent zones. The height of each low wall is higher than the opening 14. The volume between the low walls and the regulating zone 3, the oil separator zone 4, and the lifting zone 5 should be no less than the maximum discharge volume of the airport oil depot's wastewater. This allows for centralized wastewater treatment, improving treatment efficiency, reducing operating costs, and facilitating monitoring and management. The partition walls effectively separate the different zones, controlling wastewater flow through bottom openings, reducing backflow of floating oil, and enhancing oil-water separation. The low walls ensure that oil remains on the surface, minimizing interference with subsequent treatment areas and improving overall treatment efficiency. At the same time, this design makes the sewage flow smoother, facilitates maintenance and cleaning, and improves the stability and economy of the system.

[0040] According to another embodiment of the present application, preferably, the oily wastewater treatment device can be arranged inside the primary wastewater treatment device, and the oily wastewater treatment device is a mineral oil separator 6. The mineral oil separator 6 is suitable for wastewater with a high content of oil substances and can effectively remove oil substances in the wastewater. Preferably, the primary wastewater treatment device can be a grease trap, which can include: a regulating area 3: the regulating area 3 is arranged at the inlet end of the grease trap, and is used to temporarily store oily wastewater and balance the water quality of the wastewater; an oil separator 4: the oil separator 4 is arranged in the middle of the grease trap, and the oil separator 4 preliminarily separates the oil and water in the oily wastewater; and a lifting area 5: the lifting area 5 is arranged at the outlet end of the grease trap, and is used to discharge wastewater with a low oil content for the next step of wastewater treatment; wherein the mineral oil separator 6 is arranged in the oil separator 4, and the inlet and outlet of the oil separator 4 both pass through the mineral oil separator 6. The installation of mineral oil separators 6 at the inlet and outlet of the oil separation zone 4 improves oil-water separation efficiency, ensuring effective filtration of oil contaminants both at the inlet and outlet of the wastewater. The zoning of the conditioning zone 3, oil separation zone 4, and lifting zone 5 optimizes the process, reduces the load on subsequent treatment equipment, and prevents oil backflow, enhancing the overall stability and treatment effectiveness of the system. This overall design achieves highly efficient primary oil-water separation, improving the operational efficiency of the wastewater treatment system.

[0041] In the present application, a liquid level meter 18 is provided inside the regulating area 3 in the oily wastewater primary treatment device. The liquid level meter 18 can monitor the liquid level changes of the wastewater in the regulating area 3 to ensure the normal operation of the system.

[0042] In order to combine the mineral oil separator 6 with the primary sewage treatment device and improve the treatment effect of oily sewage, preferably, partition walls are provided between the regulating area 3, the oil separation area 4, and the lifting area 5 of the grease trap. Specifically, a first partition wall 7 is provided within the regulating area 3 and has an opening at the bottom. A first low wall 8 is provided in the regulating area 3, which is higher than the opening of the first partition wall 7. The design of the first low wall 8 ensures that sewage entering the regulating area 3 will not pass over the first low wall 8 and enter the area of ​​the primary sewage inlet of the regulating area 3 until it reaches a certain volume. It also prevents sewage backflow. The height of the first low wall 8 is determined according to the volume of sewage that can be treated by the oily sewage treatment device at one time.

[0043] To enhance oil-water separation, a second partition wall 9 may be preferably positioned between the oil separation zone 4 and the conditioning zone 3, and a third partition wall 10 may be positioned between the oil separation zone 4 and the lifting zone 5. The mineral oil separator 6 is positioned between the second and third partition walls 9, 10. Installing the mineral oil separator 6 between the second and third partition walls 9, 10 effectively intercepts oil in the wastewater, ensuring that it is fully treated before entering the lifting zone 5. Preferably, the mineral oil separator 6 includes an inlet 61 positioned on the second partition wall 9, an outlet 62 positioned on the third partition wall 10, and a wastewater separator 63 connected to the outlet 62 and secured between the second and third partition walls 9, 10. The placement of the wastewater separator 63 between the two partition walls makes the equipment layout compact and optimizes space utilization. This design enhances oil-water separation, reduces pollution spread, ensures that wastewater is fully treated before entering the lifting zone 5, simplifies maintenance, and improves overall treatment efficiency and system stability.

[0044] Preferably, a second low wall 11 is disposed between the second partition wall 9 and the third partition wall 10. The height of the second low wall 11 is lower than the entrance of the sewage separation device 63. The height difference between the second low wall and the entrance of the sewage separation device creates a sewage level difference that overcomes the resistance of the mineral oil grease separator during oil separation, ensuring the proper operation of the grease trap. The minimum height difference is set based on the requirements of the mineral oil grease separator used.

[0045] Preferably, the lifting area 5 includes a sump 12 and a sewage lifting device for collecting and transferring sewage, ensuring smooth flow and effective transfer of sewage, providing a stable sewage supply for subsequent treatment, and simplifying sewage management and operation.

[0046] A low wall is set above the sump 12 in the above-mentioned lifting area 5, which can effectively prevent the sewage in the sump 12 from flowing back and buffer the water flow rate entering the sump 12. Secondly, it can also prevent sludge from entering the interior of the sump 12 and prevent blockage of the sewage lifting device.

[0047] The sewage lifting device may include a lifting pump 15, a lifting pipe 16 and a water suction bell mouth 17. In order to prevent the sewage from flowing back, a backflow preventer 25 is also provided on the top of the lifting pipe 16.

[0048] When the oily wastewater treatment device is a mobile oily wastewater treatment device 1, the effluent detection device is a monitoring well 22. The inlet of the mobile oily wastewater treatment device 1 is connected to the effluent pipe of the lifting area 5, and the outlet is connected to the inlet of the detection well 22. One end of the detection well 22 is connected to the domestic sewage inspection well, and the other end is connected to the regulation area 3. Sewage that passes the detection well inspection enters the domestic sewage inspection well through the opening 23, and unqualified sewage enters the regulation area 3 through the buried extension rod elastic seat sealing gate valve 23 and the sealing well 24 for secondary oil separation treatment. A suction pump is provided inside the mobile oily wastewater treatment device 1 to suck sewage from the primary sewage treatment device into the mobile oily wastewater treatment device 1 for secondary oil separation treatment.

[0049] When the oily wastewater treatment device is a fixed oily wastewater treatment device 2, the above-mentioned effluent detection device is a dual-purpose well 26. The inlet of the fixed oily wastewater treatment device 2 is connected to the effluent pipe of the lifting area 5, and the outlet is connected to the dual-purpose well 26 through the primary discharge pipe 27. The dual-purpose well 26 is provided with a detection port 30. The sewage that passes the inspection is discharged into the domestic sewage inspection well by opening the buried extension rod elastic seat sealing gate valve 23, and the sewage that fails the inspection is discharged into the regulation area 3 by opening the buried extension rod elastic seat sealing gate valve 23 and the sealing water well 24. The fixed oily wastewater treatment device 2 needs to be backwashed regularly. The fixed oily wastewater treatment device 2 is provided with a suction pump, which can flow the domestic water supply or recycled water in the dual-purpose well into the fixed oily wastewater treatment device 2 through the backwash pipe 28 for backwashing. A liquid level gauge 18 and a vent 19 are provided inside the dual-purpose well 26. A valve well 29 is provided near the dual-purpose well 26. The valve well 29 is installed on the domestic water supply or reclaimed water pipeline. When the fixed oily wastewater treatment device needs to be backwashed, the sewage in the dual-purpose well 26 is drained, and the valve in the valve well 29 is opened to replenish water to the dual-purpose well 26, serving as a backwash water source.

[0050] When the oily wastewater treatment device is a mineral oil oil separator 6, the above-mentioned water outlet detection device is a detection port 30 set in the lifting area 5. When the water outlet is qualified, it enters the domestic sewage network through the pipeline of the lifting area 5. When the sewage is unqualified, the sewage enters the regulation area 3 through the pipeline. In this application, the unqualified sewage is returned to the regulation area 3 through the pipeline in the manhole 21 of the regulation area 3.

[0051] In order to prevent the generation of gas during the storage and treatment of sewage, which may cause excessive internal pressure in the primary sewage treatment device, air vents 19 and explosion-proof and fire-resistant air caps 20 are provided on the top of the primary sewage treatment device. The number of the above-mentioned air vents 19 and explosion-proof and fire-resistant air caps 20 is arranged according to the partitions in the grease trap, which can allow harmful gases generated in each part of the grease trap to escape, reduce the risk of explosion or toxic gas leakage, and ensure the safety of personnel and facilities.

[0052] In order to facilitate the maintenance of the primary sewage treatment device, a manhole 21 is provided on the top of the primary sewage treatment device. The number of the above manholes 21 is set according to actual needs. For example, when the primary sewage treatment and the oily sewage treatment device are set independently, the adjustment area, oil separation area and lifting area of ​​the above grease trap are respectively provided with one manhole. When the oily sewage treatment device is set inside the primary sewage treatment device, the adjustment area and lifting area of ​​the above grease trap are respectively provided with one manhole, and the oil separation area is provided with two manholes. The above manholes can enable staff to quickly deal with the situation when a fault or blockage occurs inside the grease trap, thereby ensuring the normal operation of the grease trap.

[0053] The oily wastewater treatment system proposed in this application, applied to airport oil depots, effectively separates and removes oil from oily wastewater. By accurately monitoring oil contamination levels, it optimizes resource utilization and treatment efficiency, while also ensuring the stability and reliability of the oily wastewater treatment system. This system not only reduces the burden on subsequent domestic wastewater treatment units, lowering equipment wear and maintenance costs, but also ensures that the final water quality meets discharge standards, contributing to environmental protection.

[0054] The preferred embodiments of the present application are described in detail above. However, the present application is not limited to the specific details of the above embodiments. Within the technical concept of the present application, various simple modifications can be made to the technical solution of the present application, and these simple modifications all fall within the scope of protection of the present application.

[0055] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner unless there is any contradiction. In order to avoid unnecessary repetition, this application will not further describe various possible combinations.

[0056] In addition, the various embodiments of the present application may be arbitrarily combined, and as long as they do not violate the concept of the present application, they should also be regarded as the contents disclosed by the present invention.

Claims

1. The oily wastewater treatment system used in airport oil depots is characterized by: The oily wastewater treatment system includes a primary wastewater treatment device, an oily wastewater treatment device, and an effluent detection device. The effluent detection device discharges wastewater that passes the oil pollution test into a domestic sewage pipeline, and returns wastewater that fails the oil pollution test to the primary wastewater treatment device through a pipeline. The primary wastewater treatment device is a grease trap, which includes: Adjustment zone (3): The adjustment zone (3) is provided at the inlet end of the grease trap and is used to temporarily store oily wastewater and balance the wastewater quality; Oil separation zone (4): The oil separation zone (4) is arranged in the middle of the oil separation tank, and the oil separation zone (4) preliminarily separates the oil and water in the oily wastewater; and Lifting zone (5): The lifting zone (5) is arranged at the outlet end of the grease trap and is used to discharge the sewage with less oil content for the next sewage treatment.

2. The oily wastewater treatment system for an airport oil depot according to claim 1 is characterized in that: The oily wastewater treatment device is connected to the primary wastewater treatment device via a pipeline and is independently arranged outside the primary wastewater treatment device. The oily wastewater treatment device is a mobile oily wastewater treatment device (1) or a fixed oily wastewater treatment device (2).

3. The oily wastewater treatment system for an airport oil depot according to claim 2 is characterized in that: Partition walls and low walls are provided between the regulating area (3), the oil separation area (4) and the lifting area (5) of the grease trap; The bottom of the partition wall is provided with an opening for connecting two adjacent areas; The height of the low wall is higher than the opening of the partition wall.

4. The oily wastewater treatment system for an airport oil depot according to claim 1 is characterized in that: The oily wastewater treatment device is arranged inside the sewage primary treatment device, and the oily wastewater treatment device is a mineral oil separator (6).

5. The oily wastewater treatment system for an airport oil depot according to claim 4 is characterized in that: The lifting area (5) is provided with a detection port for sampling, testing, and distinguishing the water outlet of the system for the next step of treatment; wherein, the mineral oil separator (6) is provided in the oil separation area (4), and the inlet and outlet of the oil separation area (4) both pass through the mineral oil separator (6).

6. The oily wastewater treatment system for an airport oil depot according to claim 5 is characterized in that: Partition walls are provided between the regulating area (3), the oil separation area (4) and the lifting area (5) of the grease trap, wherein a first partition wall (7) is provided inside the regulating area (3) and an opening is provided at the bottom, and a first low wall (8) is provided in the regulating area (3) and is higher than the opening of the first partition wall (7); A second partition wall (9) is provided between the oil separation area (4) and the regulating area (3), a third partition wall (10) is provided between the oil separation area (4) and the lifting area (5), and the mineral oil separator (6) is provided between the second partition wall (9) and the third partition wall (10).

7. The oily wastewater treatment system for an airport oil depot according to claim 6 is characterized in that: The mineral oil separator (6) comprises: An entrance (61) is provided on the second partition wall (9), An outlet (62) is provided on the third partition wall (10), The sewage separation device (63) is connected to the outlet (62) and is fixed between the second partition wall (9) and the third partition wall (10) through the outlet (62).

8. The oily wastewater treatment system for an airport oil depot according to claim 7 is characterized in that: A second low wall (11) is provided between the second partition wall (9) and the third partition wall (10), and the height of the second low wall (11) is lower than the inlet (61) of the sewage separation device.

9. The oily wastewater treatment system for an airport oil depot according to claim 1 is characterized in that: The lifting area includes a sump (12) and a sewage lifting device for collecting and transferring sewage.

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