Oiling agent wastewater treatment device

Abstract

The utility model discloses an oiling agent wastewater treatment device which comprises a mechanical filtering device, an oiling agent wastewater collecting tank, an oiling agent wastewater acidification tank, an acidification effluent sedimentation tank, an oiling agent wastewater aerobic tank and an aerobic sedimentation tank, and oiling agent wastewater flows into the oiling agent wastewater collecting tank to be stored after impurities are removed through the mechanical filtering device; oil agent wastewater in the oil agent wastewater collecting pool is discharged into the oil agent wastewater acidification pool to be stirred, then molecules are refined, COD is degraded, mixed liquid obtained after acidification and degradation is conveyed into the acidification effluent sedimentation pool to be precipitated, and supernate in the acidification effluent sedimentation pool is conveyed into the oil agent wastewater aerobic pool to be subjected to oxidized organic matter decomposition; and after the oiling agent wastewater treated by the oiling agent wastewater aerobic tank enters an aerobic sedimentation tank to be settled, discharging supernate into a domestic sewage treatment system. The problem that the spinning oil wastewater is difficult to treat due to overhigh COD (Chemical Oxygen Demand) can be solved, and the collected and treated spinning wastewater reaches the standard of direct receiving and treatment of a sewage station.

Description

Technical Field

[0001] The utility model relates to the technical field of oil wastewater treatment, in particular to an oil wastewater treatment device. Background Art

[0002] At present, spinning oil is an indispensable spinning aid in chemical fiber production, which can make synthetic fibers have better processing performance. However, the wastewater mixed with spinning oil is collected and produced in the spinning air purification treatment device, which has a very high COD and cannot be directly discharged to the sewage station, and it is quite troublesome to handle. Summary of the invention

[0003] In order to solve certain technical problems existing in the prior art, the purpose of this application is to provide an oil wastewater treatment device, which can solve the problem of excessively high COD in spinning oil wastewater and difficulty in treatment, so that the spinning wastewater can meet the standards for direct reception and treatment by the sewage station after collection and treatment, and ensure that the system can operate efficiently and stably for a long time even in winter.

[0004] In order to solve the above existing technical problems, this application adopts the following technical solutions:

[0005] An oil wastewater treatment device comprises a mechanical filtering device, an oil wastewater collection tank, an oil wastewater acidification tank, an acidification effluent sedimentation tank, an oil wastewater aerobic tank, and an aerobic sedimentation tank. After the oil wastewater passes through the mechanical filtering device to remove impurities, it flows into the oil wastewater collection tank for storage. The oil wastewater in the oil wastewater collection tank is discharged into the oil wastewater acidification tank for stirring, and then the molecules are refined and COD is degraded. The mixed liquid after acidification and degradation is transported to the acidification effluent sedimentation tank for precipitation. The supernatant in the acidification effluent sedimentation tank is transported to the oil wastewater aerobic tank for oxidative organic matter decomposition. After the oil wastewater treated in the oil wastewater aerobic tank enters the aerobic sedimentation tank for precipitation, the supernatant is discharged into a domestic sewage treatment system.

[0006] Preferably, a wastewater delivery pump is provided between the oil wastewater collection tank and the oil wastewater acidification tank, and a flow meter and a drain valve are provided on the output pipe of the wastewater delivery pump. The flow rate of wastewater from the oil wastewater collection tank into the oil wastewater acidification tank can be counted by the flow meter and adjusted by the drain valve.

[0007] Preferably, a heat exchanger is also provided on the acidified effluent sedimentation tank, a non-clogging convection pump is provided between the acidified effluent sedimentation tank and the heat exchanger, an effluent distribution pipe is provided between the heat exchanger and the oil agent wastewater acidification tank, and the supernatant in the acidified effluent sedimentation tank is transported to the heat exchanger by the non-clogging convection pump for heating and then refluxed to the oil agent wastewater acidification tank through the effluent distribution pipe.

[0008] Preferably, two groups of the outlet water distribution pipes are provided in the oil wastewater acidification tank, and a convection water inlet regulating valve is provided on each of the two groups of the outlet water distribution pipes, and the two groups of the outlet water distribution pipes are arranged opposite to each other.

[0009] Preferably, the water inlet and outlet of the heat exchanger are respectively provided with a steam automatic regulating valve and a temperature sensor.

[0010] Preferably, a first sedimentation guide tube is provided in the acidified effluent sedimentation tank, and the bottom of the first sedimentation guide tube is suspended from the bottom of the acidified effluent sedimentation tank. The wastewater discharged from the oil wastewater acidification tank enters the first sedimentation guide tube for sedimentation, so that the supernatant after sedimentation flows out through the bottom of the first sedimentation guide tube and is located in the upper layer between the outer wall of the first sedimentation guide tube and the acidified effluent sedimentation tank.

[0011] Preferably, a first reflux pump is provided between the bottom of the acidified effluent sedimentation tank and the oil agent wastewater acidification tank, and a sludge reflux valve is provided on the output pipe of the first reflux pump, so that the sludge in the acidified effluent sedimentation tank is refluxed into the oil agent wastewater acidification tank through the first reflux pump.

[0012] Preferably, the outlet pipe of the first reflux pump is further provided with an external sludge discharge pipe connected to the sludge tank, and the external sludge discharge pipe is provided with a first sludge discharge valve.

[0013] Preferably, a vertical pipe for entering compressed air is provided in the oil wastewater aerobic tank, an aeration horizontal pipe with an air outlet hood is provided at the bottom of the vertical pipe, an electric rotation drive device is provided on the vertical pipe, and the aeration horizontal pipe drives the vertical pipe to rotate through the electric rotation drive device.

[0014] Preferably, a dissolved oxygen measuring sensor is also provided in the oil wastewater aerobic tank.

[0015] Preferably, a second sedimentation guide tube is suspended in the aerobic sedimentation tank, and the wastewater in the oil wastewater aerobic tank is directly discharged into the second sedimentation guide tube through a pipeline.

[0016] Preferably, a second reflux pump is provided at the bottom of the aerobic sedimentation tank, a second reflux valve is provided at the water outlet of the second reflux pump, and the sludge in the aerobic sedimentation tank is refluxed into the oil wastewater aerobic tank through the second reflux pump.

[0017] Preferably, a second sludge discharge valve is provided between the discharge pipe of the second reflux pump and the external sludge discharge pipe, and the sludge discharged from the second reflux pump can also be transported and discharged into the external sludge discharge pipe through the second sludge discharge valve.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] After the COD in the oil wastewater is treated by acidification and aerobic dual reaction in the oil wastewater acidification tank and the oil wastewater aerobic tank, the supernatant can be directly discharged to the sewage station in the domestic sewage treatment system, which can solve the problem of COD in the spinning oil wastewater being too high and difficult to treat, and make the spinning wastewater meet the standard of direct reception and treatment by the sewage station after collection and treatment. At the same time, after precipitation in the acidification effluent sedimentation tank, the oil wastewater aerobic tank can better remove organic matter in the wastewater when oxygen is used to decompose organic matter in the wastewater, and further degrade COD. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] In the figure: 1. drain valve; 2. flow meter; 3. wastewater delivery pump; 4. oil wastewater collection tank; 5. mechanical filtering device; 6. effluent distribution pipe; 7. oil wastewater acidification tank; 8. convection water inlet regulating valve; 9. temperature sensor; 10. acidification effluent sedimentation tank; 11. heat exchanger; 12. steam automatic regulating valve; 13. non-clogging convection pump; 14. first sedimentation guide tube; 15. oil wastewater aerobic tank; 16. electric rotary drive device; 17. aerobic sedimentation tank; 18. second sedimentation guide tube; 19. second reflux pump; 20. second mud discharge valve; 21. second reflux valve; 22. aeration horizontal pipe; 23. vertical pipe; 24. dissolved oxygen measurement sensor; 25. external sludge pipe; 26. first reflux pump; 27. first mud discharge valve; 28. sludge reflux valve. DETAILED DESCRIPTION

[0022] Below, the present application is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0023] In the description of the present application, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0024] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0025] like Figure 1 As shown, an oil wastewater treatment device includes a mechanical filtering device 5, an oil wastewater collection tank 4, an oil wastewater acidification tank 7, an acidified effluent sedimentation tank 10, an oil wastewater aerobic tank 15, and an aerobic sedimentation tank 17. After the oil wastewater passes through the mechanical filtering device 5 to remove impurities, it flows into the oil wastewater collection tank 4 for storage. The oil wastewater in the oil wastewater collection tank 4 is discharged into the oil wastewater acidification tank 7 for stirring and then the molecules are refined and the COD is degraded. The mixed liquid after acidification and degradation is transported to the acidified effluent sedimentation tank 10 for precipitation. The supernatant in the acidified effluent sedimentation tank 10 is transported to the oil wastewater aerobic tank 15 for oxidative organic matter decomposition. After the oil wastewater is treated in the oil wastewater aerobic tank 15, it enters the aerobic sedimentation tank 17 for precipitation, and the supernatant is discharged into the domestic sewage treatment system.

[0026] Before the oily wastewater generated in the spinning air purification treatment device is collected and discharged into the sewage station, the oily wastewater is first connected to the water inlet end of the mechanical filtering device 5 through a pipeline, and the impurities in the oily wastewater are removed by the mechanical filtering device 5, wherein different filtering precisions can achieve different filtering effects, and the filtered wastewater enters the oily wastewater collection tank 4 through the pool inlet pipe for storage, and the wastewater in the oily wastewater collection tank 4 is then injected into the oily wastewater acidification tank 7 for stirring by a stirrer to refine the molecules and degrade COD, wherein, before treating the oily wastewater, anaerobic acidification bacterial sludge and nutrients such as compound fertilizer and urea are added to the oily wastewater collection tank 4 for acidification bacterial cultivation, so as to make the COD degradation effect in the oily wastewater better, and the wastewater treated by the oily wastewater acidification tank 7 is again transported to the acidification effluent sedimentation tank 10 for sedimentation, so that the sludge settles downward and the clean water goes up, and the upper clean water after the upward movement is then The wastewater is discharged into the aerobic tank 15 for the first time. Since the wastewater discharged from the acidification tank 7 contains a large amount of sludge mixture, it is easy to have excessive turbidity when it directly enters the aerobic tank 15 for the oil agent wastewater, and it is also easy to take away a large amount of acidified bacterial culture materials. Therefore, after precipitation through the acidification effluent sedimentation tank 10, the aerobic tank 15 for the oil agent wastewater can better remove the organic matter in the wastewater when oxygen is used to decompose the organic matter in the wastewater, and further degrade the COD. Finally, the wastewater discharged from the aerobic tank 15 for the oil agent wastewater is precipitated in the aerobic sedimentation tank 17. After the COD in the oil agent wastewater is double-treated by acidification reaction and aerobic reaction, the supernatant can be directly discharged to the sewage station in the domestic sewage treatment system, which can solve the problem of COD in the spinning oil agent wastewater being too high and difficult to treat, and make the spinning wastewater meet the standard of direct reception and treatment by the sewage station after collection and treatment.

[0027] A further improvement is that a wastewater delivery pump 3 is provided between the oil wastewater collection tank 4 and the oil wastewater acidification tank 7, and a flow meter 2 and a drain valve 1 are provided on the output pipe of the wastewater delivery pump 3. The wastewater flow rate from the oil wastewater collection tank 4 into the oil wastewater acidification tank 7 can be counted by the flow meter 2 and adjusted by the drain valve 1.

[0028] When the oily wastewater in the oily wastewater collection tank 4 is transported to the oily wastewater acidification tank 7, it is transported by the wastewater delivery pump 3, and an electronic flowmeter 2 and a drain valve 1 are installed on the output pipe of the wastewater delivery pump 3. The output oily wastewater volume can be accurately controlled by the electronic flowmeter 2, so that the purpose of automatically controlling the sewage treatment volume is achieved through the drain valve 1. The automatic control is convenient, the wastewater treatment effect is good, and it can be arbitrarily adjusted according to the wastewater treatment capacity of the oily wastewater acidification tank 7.

[0029] A further improvement is that a heat exchanger 11 is also provided on the acidified effluent sedimentation tank 10, a non-clogging convection pump 13 is provided between the acidified effluent sedimentation tank 10 and the heat exchanger 11, and an outlet water distribution pipe 6 is provided between the heat exchanger 11 and the oil wastewater acidification tank 7. The supernatant in the acidified effluent sedimentation tank 10 is transported to the heat exchanger 11 through the non-clogging convection pump 13 for heating and then flows back to the oil wastewater acidification tank 7 through the outlet water distribution pipe 6; the water inlet and outlet ends of the heat exchanger 11 are respectively provided with a steam automatic regulating valve 12 and a temperature sensor 9.

[0030] After the wastewater degraded by the oil wastewater acidification tank 7 enters the acidification effluent sedimentation tank 10 for sedimentation, the relatively clean supernatant is injected into the heat exchanger 11 through the non-clogging convection pump 13 for heating, and the heated wastewater is then sent to the oil wastewater acidification tank 7 through the outlet distribution pipe 6 for further degradation and heating of the internal wastewater. The water inlet and outlet ends of the heat exchanger 11 are respectively provided with a steam automatic regulating valve 12 and a temperature sensor 9, which can set the outlet water temperature and interlock with the steam automatic regulating valve 12 to facilitate precise temperature control; create a good living environment for acidifying bacteria, so that the entire system can perform effective acidification treatment even in winter, ensuring that the system can operate efficiently and stably for a long time in winter.

[0031] A further improvement is that two groups of the outlet water distribution pipes 6 are provided in the oil wastewater acidification tank 7, and a convection water inlet regulating valve 8 is provided on each of the two groups of the outlet water distribution pipes 6, and the two groups of the outlet water distribution pipes 6 are arranged opposite to each other.

[0032] The convection stirring of the oil wastewater acidification tank 7 is realized, the flow of various substances in the oil wastewater acidification tank 7 is increased, the temperature distribution of the oil wastewater acidification tank 7 is ensured to be uniform, and a good living environment is created for acidifying bacteria.

[0033] A further improvement is that a first sedimentation guide tube 14 is provided in the acidified effluent sedimentation tank 10, and the bottom of the first sedimentation guide tube 14 is suspended from the bottom of the acidified effluent sedimentation tank 10. The wastewater discharged from the oil wastewater acidification tank 7 enters the first sedimentation guide tube 14 for sedimentation, so that the supernatant after sedimentation flows out through the bottom of the first sedimentation guide tube 14 and is located in the upper layer between the outer wall of the first sedimentation guide tube 14 and the acidified effluent sedimentation tank 10.

[0034] When the wastewater discharged from the oil wastewater acidification tank 7 enters the first sedimentation guide tube 14 for sedimentation, it is directly injected into the first sedimentation guide tube 14 through a pipeline, thereby avoiding secondary mixing of turbid wastewater and the upper clear water that has been precipitated, so that the mixed sewage only flows in large quantities inside the first sedimentation guide tube 14 and at the bottom of the acidification effluent sedimentation tank 10, while the sludge after sedimentation is at the bottom of the acidification effluent sedimentation tank 10, and part of the clear liquid flows outward along the bottom of the first sedimentation guide tube 14 and the suspended bottom of the acidification effluent sedimentation tank 10 into the upper layer between the outer wall of the first sedimentation guide tube 14 and the acidification effluent sedimentation tank 10, so that there is less sludge in the sewage discharged into the oil wastewater aerobic tank 15, effectively solving the problem of excessive sludge discharge.

[0035] A further improvement is that a first reflux pump 26 is provided between the bottom of the acidified effluent sedimentation tank 10 and the oil-agent wastewater acidification tank 7, and a sludge reflux valve 28 is provided on the output pipe of the first reflux pump 26. The sludge in the acidified effluent sedimentation tank 10 is refluxed into the oil-agent wastewater acidification tank 7 through the first reflux pump 26; an external sludge pipe 25 connected to the sludge tank is also provided on the outlet pipe of the first reflux pump 26, and a first sludge discharge valve 27 is provided on the external sludge pipe 25.

[0036] The sludge at the bottom of the acidified effluent sedimentation tank 10 can be continuously pumped into the oil wastewater acidification tank 7 through the first reflux pump 26, so that the acidified bacteria in the sludge can continue to decompose and avoid the phenomenon of too fast loss of the acidified bacteria culture matrix in the oil wastewater acidification tank. The start time of the first reflux pump 26 can be controlled by the sludge reflux valve 28, so as to achieve the purpose of automatic reflux. Among them, when there is too much sludge, the excess sludge can be discharged through the outlet pipe of the first reflux pump 26, and the first sludge discharge valve 27 is opened to allow the excess sludge to be transported to the sludge removal tank through the external sludge discharge pipe 25 for dehydration.

[0037] A further improvement is that a vertical pipe 23 for entering compressed air is provided in the oil wastewater aerobic tank 15, an aeration horizontal pipe 22 with an air outlet hood is provided at the bottom of the vertical pipe 23, an electric rotation drive device 16 is provided on the vertical pipe 23, and the aeration horizontal pipe 22 drives the vertical pipe 23 to rotate through the electric rotation drive device 16; a dissolved oxygen measurement sensor 24 is also provided in the oil wastewater aerobic tank 15.

[0038] After the supernatant wastewater from the acidified effluent sedimentation tank 10 enters the oil wastewater aerobic tank 15, compressed air enters from the vertical pipe 23 and then emerges from the aeration horizontal pipe 22 with an air outlet hood. The aeration pipeline can be rotated for aeration through the electric rotary drive device 16, making the aeration more uniform and more economical. The vertical pipe 23 is provided with a compressed air automatic regulating valve, and the oil wastewater aerobic tank 15 is provided with a dissolved oxygen monitoring sensor, which can monitor the dissolved oxygen content in the tank in real time, and adjust the compressed air consumption through the compressed air automatic regulating valve to achieve stable control of dissolved oxygen.

[0039] A further improvement is that a second sedimentation guide tube 18 is suspended in the aerobic sedimentation tank 17, and the wastewater in the oil wastewater aerobic tank 15 is directly discharged into the second sedimentation guide tube 18 through a pipeline; a second reflux pump 19 is provided at the bottom of the aerobic sedimentation tank 17, and a second reflux valve 21 is provided at the water outlet end of the second reflux pump 19, and the sludge in the aerobic sedimentation tank 17 is refluxed into the oil wastewater aerobic tank 15 through the second reflux pump 19; a second sludge discharge valve 20 is provided between the discharge pipe of the second reflux pump 19 and the external sludge discharge pipe 25, and the sludge discharged from the second reflux pump 19 can also be transported and discharged into the external sludge discharge pipe 25 through the second sludge discharge valve 20.

[0040] When the wastewater in the aerobic tank 15 for oil wastewater is discharged to the aerobic sedimentation tank 17, the wastewater is directly discharged into the second sedimentation guide tube 18, and its effect is consistent with the first sedimentation guide tube 14, which can realize the sedimentation of sludge in the wastewater while realizing the separation and outflow of the supernatant. At this time, the supernatant in the aerobic sedimentation tank 17 can be discharged to the domestic sewage system for further treatment. Among them, most of the sludge at the bottom of the aerobic sedimentation tank 17 is returned to the aerobic tank 15 for oil wastewater for reuse through the second reflux pump 19, and the excess sludge is discharged into the sludge discharge pipe through the second sludge discharge valve 20, and then enters the sludge tank of the sewage station. The instrument automation system is used in the entire treatment process to realize automatic control to ensure the long-term efficient and stable operation of the system.

[0041] The above-mentioned implementation modes are only preferred implementation modes of the present application and cannot be used to limit the scope of protection of the present application. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present application shall fall within the scope of protection required by the present application.

Claims

1. An oil wastewater treatment device, characterized in that: The invention comprises a mechanical filtering device (5), an oil wastewater collection tank (4), an oil wastewater acidification tank (7), an acidification effluent sedimentation tank (10), an oil wastewater aerobic tank (15), and an aerobic sedimentation tank (17). After the oil wastewater passes through the mechanical filtering device (5) to remove impurities, it flows into the oil wastewater collection tank (4) for storage. The oil wastewater in the oil wastewater collection tank (4) is discharged into the oil wastewater acidification tank (7) for stirring and then the molecules are refined and COD is degraded. The mixed liquid after acidification and degradation is transported to the acidification effluent sedimentation tank (10) for sedimentation. The supernatant in the acidification effluent sedimentation tank (10) is transported to the oil wastewater aerobic tank (15) for oxidation and decomposition of organic matter. After the oil wastewater is treated in the oil wastewater aerobic tank (15), it enters the aerobic sedimentation tank (17) for sedimentation, and the supernatant is discharged into the domestic sewage treatment system.

2. The oil wastewater treatment device according to claim 1, characterized in that: A wastewater delivery pump (3) is provided between the oil wastewater collection tank (4) and the oil wastewater acidification tank (7); a flow meter (2) and a drain valve (1) are provided on the output pipeline of the wastewater delivery pump (3); the flow rate of wastewater from the oil wastewater collection tank (4) into the oil wastewater acidification tank (7) can be counted by the flow meter (2) and adjusted by the drain valve (1).

3. The oil wastewater treatment device according to claim 1, characterized in that: The acidified effluent sedimentation tank (10) is also provided with a heat exchanger (11), a non-clogging convection pump (13) is provided between the acidified effluent sedimentation tank (10) and the heat exchanger (11), and an effluent distribution pipe (6) is provided between the heat exchanger (11) and the oil wastewater acidification tank (7), and the supernatant in the acidified effluent sedimentation tank (10) is transported to the heat exchanger (11) through the non-clogging convection pump (13) for heating and then flows back to the oil wastewater acidification tank (7) through the effluent distribution pipe (6).

4. The oil wastewater treatment device according to claim 3, characterized in that: Two groups of outlet water distribution pipes (6) are arranged in the oil wastewater acidification tank (7), and a convection water inlet regulating valve (8) is provided on each of the two groups of outlet water distribution pipes (6). The two groups of outlet water distribution pipes (6) are arranged opposite to each other.

5. The oil wastewater treatment device according to claim 1, characterized in that: A first sedimentation guide tube (14) is provided in the acidified effluent sedimentation tank (10), and the bottom of the first sedimentation guide tube (14) is suspended from the bottom of the acidified effluent sedimentation tank (10). Wastewater discharged from the oil wastewater acidification tank (7) enters the first sedimentation guide tube (14) for sedimentation, so that the supernatant after sedimentation flows outward through the bottom of the first sedimentation guide tube (14) and is located in the upper layer between the outer wall of the first sedimentation guide tube (14) and the acidified effluent sedimentation tank (10).

6. The oil wastewater treatment device according to claim 5, characterized in that: A first reflux pump (26) is provided between the bottom of the acidified effluent sedimentation tank (10) and the oil-based wastewater acidification tank (7), and a sludge reflux valve (28) is provided on the output pipe of the first reflux pump (26). The sludge in the acidified effluent sedimentation tank (10) is refluxed into the oil-based wastewater acidification tank (7) through the first reflux pump (26).

7. The oil wastewater treatment device according to claim 6, characterized in that: The outlet pipe of the first reflux pump (26) is also provided with an external sludge discharge pipe (25) connected to the sludge tank, and the external sludge discharge pipe (25) is provided with a first sludge discharge valve (27).

8. The oil wastewater treatment device according to claim 1, characterized in that: The oil wastewater aerobic pool (15) is provided with a vertical pipe (23) for entering compressed air, the bottom of the vertical pipe (23) is provided with an aeration transverse pipe (22) with an air outlet hood, the vertical pipe (23) is provided with an electric rotary drive device (16), and the aeration transverse pipe (22) drives the vertical pipe (23) to rotate through the electric rotary drive device (16).

9. The oil wastewater treatment device according to claim 1, characterized in that: A second sedimentation guide tube (18) is suspended in the aerobic sedimentation tank (17), and wastewater in the oil wastewater aerobic tank (15) is directly discharged into the second sedimentation guide tube (18) through a pipeline.

10. The oil wastewater treatment device according to claim 7, characterized in that: A second reflux pump (19) is provided at the bottom of the aerobic sedimentation tank (17), and a second reflux valve (21) is provided at the water outlet of the second reflux pump (19). The sludge in the aerobic sedimentation tank (17) is refluxed into the oil wastewater aerobic tank (15) through the second reflux pump (19); a second sludge discharge valve (20) is provided between the discharge pipe of the second reflux pump (19) and the external sludge discharge pipe (25), and the sludge discharged from the second reflux pump (19) can also be transported and discharged into the external sludge discharge pipe (25) through the second sludge discharge valve (20).

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