Oily sewage treatment system and treatment method

Abstract

The invention provides an oily sewage treatment system and a treatment method thereof, and belongs to the technical field of sewage treatment. The system comprises: a sedimentation tank; a V-shaped oil separation tank; the ejector is used for ejecting the oily sewage settled by the settling tank into the V-shaped oil separation tank after passing through the ultrasonic device; the oil outlet pipe is used for discharging the floating oil into the heat exchanger for heat exchange; the vacuum separator is communicated with the heat exchanger; an oil tank; the water outlet pipe is used for discharging water into the activated carbon adsorption chamber; the VOC treatment tank is communicated with the activated carbon adsorption chamber and is used for receiving oil-containing waste gas generated in the regeneration process of the activated carbon adsorption chamber; the VOC treatment tank is provided with an adsorption chamber and a condensation chamber, and the VOC treatment tank is respectively connected with the heat exchanger through a compressor and an expansion valve to form a heat pump system. A gravity separation method and an air flotation method are combined, and meanwhile, an ultrasonic demulsification technology is used, so that the oil removal efficiency is improved. The energy consumption in the treatment process is reduced, and the resource utilization efficiency is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly to an oily sewage treatment system and a treatment method for the oily sewage treatment system. Background Art

[0002] Existing oily wastewater treatment methods include physical methods, chemical methods, and biological methods. In the process of treating oily wastewater, several methods are often used in combination.

[0003] The disadvantages of physical methods for treating oily wastewater are as follows: 1. Gravity separation method, with large equipment floor area and poor removal effect on emulsified oil and dissolved oil. 2. Air flotation method, with high operating cost, and the release device is prone to blockage, which will affect the air flotation effect.

[0004] The disadvantages of chemical methods for treating oily wastewater are as follows: It needs to be combined with other processes, and a large amount of chemicals need to be added, increasing the treatment cost, generating a large amount of chemical sludge, and being difficult to dispose of subsequently.

[0005] The disadvantages of biological methods for treating oily wastewater are as follows: High energy consumption, low treatment efficiency, strict requirements for conditions such as temperature, toxic and harmful substances, etc., and water quality fluctuations are likely to affect the treatment effect, and even cause the death of microorganisms.

[0006] For the treatment of VOC tail gas, only one treatment method is selected in actual production, resulting in waste of energy and resources. Summary of the Invention

[0007] In view of this, to solve the technical problem that only one treatment method is selected for the treatment of VOC tail gas in the prior art, resulting in waste of energy and resources, on the one hand, the present invention provides an oily sewage treatment system and the oily sewage treatment system. This system combines the gravity separation method with the air flotation method, and at the same time uses ultrasonic demulsification technology, so as to improve the oil removal efficiency. The energy consumption in the treatment process is reduced, and the resource utilization efficiency is further improved.

[0008] To achieve the above object, the present invention provides the following technical solutions: An oily sewage treatment system, comprising: A sedimentation tank for sedimenting oily sewage; A V-type oil separation tank; An ejector for ejecting the oily sewage sedimented in the sedimentation tank into the V-type oil separation tank after passing through an ultrasonic device; An oil outlet pipe communicated with the V-type oil separation tank for discharging the floating oil in the V-type oil separation tank into a heat exchanger for heat exchange; A vacuum separator communicated with the heat exchanger for removing moisture in the oil; An oil storage tank for storing the oil from which moisture has been removed by the vacuum separator; Outlet pipe, communicating with the V-shaped oil separator, for discharging the water in the V-shaped oil separator into the activated carbon adsorption chamber; VOC treatment tank, communicating with the activated carbon adsorption chamber, for receiving the oil-containing waste gas generated during the regeneration process of the activated carbon adsorption chamber; The VOC treatment tank has an adsorption chamber and a condensation chamber. The VOC treatment tank is connected to the heat exchanger through a compressor and an expansion valve respectively to form a heat pump system.

[0009] Preferably, tempered glass corrugated plates are arranged in the V-shaped oil separator for floating oil droplets to the water surface.

[0010] Preferably, a water ring vacuum pump connected to the vacuum separator is further included for pumping away the water vapor separated in the vacuum separator.

[0011] Preferably, a microwave generator is arranged in the activated carbon adsorption chamber.

[0012] Preferably, a drain pipe is arranged in the activated carbon adsorption chamber.

[0013] Preferably, a water pump, a grille and a screen are further included; The water pump is used for pumping the oil-containing sewage through the grille and the screen in sequence and then pumping it into the ejector.

[0014] Preferably, the ultrasonic device includes an ultrasonic generator and an ultrasonic transducer.

[0015] Preferably, a sewage discharge pipe is installed below the V-shaped oil separator for discharging the precipitated sludge.

[0016] On the other hand, the present invention also provides a treatment method for the above oil-containing sewage treatment system, including the following steps: After the oil-containing sewage precipitated in the sedimentation tank enters the ejector, it enters the V-shaped oil separator through the oil-containing sewage inlet pipe. Under the action of the tempered glass corrugated plates, the oil droplets float to the water surface, and the water passes through below the tempered glass corrugated plates and enters the overflow tank. The water in the overflow tank overflows and is discharged through the outlet pipe; the floating oil on the water surface is discharged through the oil outlet pipe, pumped into the vacuum separator through the heat exchanger, and after the water in the oil is removed, it is sent to the storage oil tank; The water in the outlet pipe enters the activated carbon adsorption chamber. The trace oil in the water is adsorbed and then discharged up to the discharge standard. The sewage is regenerated in the activated carbon adsorption chamber. The oil-containing waste gas generated during the regeneration process enters the VOC treatment tank. The VOC treatment tank is connected to the heat exchanger through a compressor and an expansion valve to form a heat pump system. The heat-containing waste gas and the heat in the air are used by the heat pump system to heat the oil containing trace water.

[0017] The provided oily wastewater treatment system and the said system combine the gravity separation method with the air flotation method, and at the same time use the ultrasonic demulsification technology, which improves the oil removal efficiency. It reduces the energy consumption during the treatment process and further enhances the resource utilization efficiency. Compared with the prior art, it has the following beneficial effects: The present invention combines the gravity separation method with the air flotation method, and at the same time uses the ultrasonic demulsification technology, which improves the oil removal efficiency. This comprehensive treatment method not only increases the speed of oil-water separation, but also greatly enhances the treatment effect. The ultrasonic demulsification technology destroys the stable layer on the surface of oil droplets through high-frequency vibration, making them easier to be separated, forming a complementarity with the gravity separation and air flotation methods, and jointly acting on the oily wastewater to ensure the clarity and compliance of the effluent quality.

[0018] The combination of an ejector and ultrasonic waves can generate smaller bubbles, which can adsorb more oil droplets, and is environmentally friendly and energy-saving; at the same time, this combined technology can also achieve efficient separation of oil and water, improve the oil recovery rate, and reduce the treatment cost. In addition, it also has the advantages of simple operation and convenient maintenance, providing a new solution for the field of industrial wastewater treatment.

[0019] The VOC treatment device is divided into upper and lower layers. First, it condenses and then adsorbs; the upper layer is the condensation area, where some components in the VOCs (volatile organic compounds) gas are condensed into liquid by reducing the temperature, thus achieving preliminary purification; the lower layer is the adsorption area, where high-efficiency adsorption materials are used to deeply adsorb the uncondensed VOCs to ensure that the discharged gas meets the environmental protection standards.

[0020] The heat recovered from the VOC device is used to heat the floating oil to achieve the purpose of energy conservation. At the same time, by precisely controlling the heating process, it can effectively avoid the quality decline caused by overheating of the floating oil, ensure that the recovered floating oil can be reused, and further improve the resource utilization rate. In addition, this solution also reduces the energy consumption and carbon emissions required by traditional heating methods, which is beneficial to environmental protection and sustainable development. Brief Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; In the figure, 1. grille; 2. screen; 3. water pump; 4. ejector; 5. ultrasonic device; 6. inlet pipe; 7. tempered glass corrugated plate; 8. sewage discharge pipe; 9. outlet pipe; 10. oil outlet pipe; 11. activated carbon adsorption chamber; 12. drain pipe; 13. microwave generator; 14. VOC treatment tank; 15. compressor; 16. expansion valve; 17. heat exchanger; 18. water ring vacuum pump; 19. vacuum separator; 20. oil storage tank. Detailed Embodiments

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention.

[0024] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] As Figure 1 shown, the present invention provides an oily sewage treatment system, including: A sedimentation tank for sedimenting oily sewage. The oily sewage is sedimented in the sedimentation tank before entering the oily sewage treatment system to remove large particulate suspended matters and floating scum, so as to reduce the burden on subsequent treatment units. The design of the sedimentation tank can effectively increase the sewage residence time and promote the natural sedimentation of suspended matters. Through this pretreatment step, the turbidity and oil content of the sewage are significantly reduced, providing more favorable conditions for subsequent treatment processes.

[0026] A V-shaped oil separation tank, preferably provided with tempered glass corrugated plates 7 therein for floating oil droplets to the water surface.

[0027] The design of the tempered glass corrugated plates 7 not only enhances the structural strength of the oil separation tank, but also effectively increases the contact area between oil droplets and water through its unique corrugated shape, accelerating the oil-water separation process. At the same time, the tempered glass material has good transparency, which is convenient for staff to directly observe the oil separation effect, make timely adjustments and maintenance, and ensure the efficient operation of the V-shaped oil separation tank.

[0028] Injector 4 is used to inject the oily sewage after sedimentation in the sedimentation tank into the V-shaped oil separation tank after passing through the ultrasonic device 5. After the oily sewage enters the injector 4, a local vacuum will be formed, sucking in air. The air mixes with the oily sewage in the expansion section to form bubbles, and enters the V-shaped oil separation tank through the oily sewage inlet pipe 6. When these bubbles rise in the oily sewage, they will carry and drive the oil droplets to float to the water surface together, thus realizing the separation of oil and water. At the same time, the design of the V-shaped oil separation tank makes it easier for the oil droplets to gather at the top of the tank, facilitating subsequent collection and treatment. The use of the injector 4 not only improves the efficiency of oil-water separation, but also reduces the energy consumption and cost during the treatment process.

[0029] The oil outlet pipe 10 is connected to the V-shaped oil separation tank and is used to discharge the floating oil in the V-shaped oil separation tank into the heat exchanger 17 for heat exchange.

[0030] The design of the oil outlet pipe 10 should consider the smoothness and efficiency of the oil flow to ensure that the floating oil can be smoothly and quickly guided into the heat exchanger 17. The material is selected to be corrosion-resistant and high-temperature-resistant to adapt to the temperature changes and chemical properties that may occur during the transmission of the oil liquid, thus ensuring the stability and reliability of long-term use.

[0031] The vacuum separator 19 is connected to the heat exchanger 17 and is used to remove the water in the oil. The floating oil on the water surface is discharged from the oil outlet pipe 10, pumped into the vacuum separator 19 through the heat exchanger 17. Since the saturated vapor pressure of oil is much less than that of water at the same temperature, the water is evaporated into water vapor and is pumped away by the following water ring vacuum pump 18. After the water in the oil is removed, it is sent into the storage oil tank 20.

[0032] The storage oil tank 20 is used to store the oil after the water has been removed by the vacuum separator 19. The storage oil tank 20 is usually made of high-strength materials to ensure that it can withstand the internal oil pressure and external environmental challenges. The tank body is designed with an anti-corrosion coating to prevent the corrosion of the tank wall during the long-term storage of the oil product.

[0033] The water outlet pipe 9 is connected to the V-shaped oil separation tank and is used to discharge the water in the V-shaped oil separation tank into the activated carbon adsorption chamber 11.

[0034] The VOC treatment tank 14 is connected to the activated carbon adsorption chamber 11 and is used to receive the oily waste gas generated during the regeneration process of the activated carbon adsorption chamber 11.

[0035] The water in the water outlet pipe 9 enters the activated carbon adsorption chamber 11. The trace oil in the water is adsorbed and reaches the discharge standard, and is discharged by the following drain pipe 12. The activated carbon adsorption chamber 11 has one standby and one in use, and is respectively equipped with a microwave generator 13 for regeneration. The oily waste gas generated during the regeneration process enters the VOC treatment tank 14.

[0036] The VOC treatment tank 14 has an adsorption chamber and a condensation chamber. The adsorption chamber is on the upper layer, and the condensation chamber is on the lower layer. The oil-containing waste gas first passes through the condensation chamber for condensation removal, and the non-condensable part then passes through the adsorption chamber for adsorption, and then is discharged into the atmosphere. The condensation chamber of the VOC treatment tank 14 is connected to the heat exchanger 17 through a compressor 15 and an expansion valve 16 respectively, forming a heat pump system.

[0037] The compressor 15 is responsible for compressing the refrigerant in a low-temperature and low-pressure state into a high-temperature and high-pressure state, and then sending it into the heat exchanger 17 to release heat, providing the thermal energy required for the vacuum separation process. The expansion valve 16 plays a role in throttling and depressurizing, turning the high-temperature and high-pressure refrigerant into a low-temperature and low-pressure refrigerant, which quickly evaporates and absorbs heat in the condensation chamber, reducing the temperature of the condensation chamber, so that the VOC gas condenses into a liquid. Through such a cyclic process, the heat pump system realizes the effective treatment of VOC gas, improving the treatment efficiency and energy utilization rate.

[0038] In the present invention, a toughened glass corrugated plate 7 is provided in the V-shaped oil separator for floating the oil droplets to the water surface.

[0039] In the present invention, it also includes a water ring vacuum pump 18 connected to the vacuum separator 19 for pumping away the water vapor separated in the vacuum separator 19. The water ring vacuum pump 18 is a device for generating and maintaining a vacuum environment. Its working principle is to form a closed water ring through the high-speed rotating pump impeller. When the water ring vacuum pump 18 is connected to the vacuum separator 19, it can effectively pump away the water vapor separated in the vacuum separator 19, ensuring the smooth progress of the separation process. The water ring vacuum pump 18 can ensure a stable vacuum environment inside the vacuum separator 19, thereby improving the separation efficiency.

[0040] Extend the equipment life: By promptly pumping away the water vapor, reduce the corrosion and damage inside the equipment, thereby extending the service life of the equipment. Avoid potential safety hazards caused by the accumulation of water vapor inside the equipment.

[0041] In the present invention, a microwave generator 13 is provided in the activated carbon adsorption chamber 11. The pollutants adsorbed on the activated carbon are activated and removed by the energy of microwaves, enabling the activated carbon to restore its adsorption capacity. Such a regeneration process helps to extend the service life of the activated carbon and reduce costs.

[0042] In the present invention, a drain pipe 12 is provided in the activated carbon adsorption chamber 11. The water in the outlet pipe 9 enters the activated carbon adsorption chamber 11. After the trace oil in the water is adsorbed and reaches the discharge standard, it is discharged by the drain pipe 12.

[0043] In the present invention, it also includes a water pump 3, a grille 1 and a sieve 2; The water pump 3 is used to pump the oily sewage through the grille 1 and the screen 2 in sequence and then pump it into the injector 4.

[0044] The grille 1 is preferably a flat fine grille 1, which can remove impurities with a particle size greater than 3 mm; the screen 2 is preferably a 100-mesh screen 2, which can remove impurities with a particle size greater than 0.1 mm. The water pump 3 plays a key role in this system and is used to transport the oily sewage to the subsequent treatment unit. It receives the oily sewage, passes through the grille 1 and the screen 2 in sequence, and then pumps the preliminarily treated water into the injector 4. In this way, the water pump 3 ensures that the sewage can flow and be treated according to the set process.

[0045] The grille 1 is mainly used to intercept large-particle impurities in the sewage. The preferably used flat fine grille 1 can effectively remove impurities with a particle size greater than 3 mm. If these impurities are not removed in advance, they may cause blockage or damage to equipment during subsequent treatment. Therefore, the setting of the grille 1 is an important step in protecting the subsequent treatment equipment.

[0046] The screen 2 plays a role in further filtration in sewage treatment. The preferably used 100-mesh screen 2 can remove fine impurities with a particle size greater than 0.1 mm. Compared with the grille 1, the screen 2 has a higher filtration accuracy and can capture finer particles, ensuring further purification of the water quality.

[0047] In the present invention, the ultrasonic device 5 includes an ultrasonic generator and an ultrasonic transducer. The ultrasonic generator is a key device for generating ultrasonic signals. It can convert electrical energy into ultrasonic vibration energy and generate ultrasonic waves with a specific frequency. These ultrasonic signals are then transmitted to the ultrasonic transducer. The ultrasonic transducer is responsible for receiving the signals from the ultrasonic generator and converting them into mechanical vibrations. These mechanical vibrations propagate in the form of ultrasonic waves and are used to process or assist in processing substances in the sewage. For example, they can help accelerate chemical reactions, improve the efficiency of substance separation, or promote oil-water separation, etc.

[0048] In the present invention, a sewage discharge pipe 8 is installed below the V-shaped oil separator for discharging the precipitated sludge. The V-shaped oil separator is an important part of the sewage treatment system. Its main function is to remove floating oil in the sewage through gravity separation or other physical methods. This design can effectively separate oil and water and allow solid waste (such as sludge) to precipitate at the bottom of the tank. The sewage discharge pipe 8 plays a key role below the V-shaped oil separator. When solid waste such as sludge precipitates in the oil separator, these wastes can be discharged from the system regularly or automatically through the sewage discharge pipe 8. This ensures the cleanliness of the system and prevents the accumulation of sludge in the system, thus guaranteeing the efficiency of subsequent treatment steps.

[0049] On the other hand, the present invention also provides a treatment method for the above oil-containing sewage treatment system, comprising the following steps: After the oil-containing sewage sedimented in the sedimentation tank enters the ejector 4, it enters the V-shaped oil separation tank through the oil-containing sewage inlet pipe 6. Under the action of the toughened glass corrugated plate 7, the oil droplets float to the water surface, and the water passes through the lower part of the toughened glass corrugated plate 7 and enters the overflow tank. After the water in the overflow tank overflows, it is discharged through the outlet pipe 9; the floating oil on the water surface is discharged through the oil outlet pipe 10 and pumped into the vacuum separator 19 through the heat exchanger 17. After the water in the oil is removed, it is sent into the storage oil tank 20; The water in the outlet pipe 9 enters the activated carbon adsorption chamber 11. The trace oil in the water is adsorbed and then discharged up to the discharge standard. The sewage is regenerated through the activated carbon adsorption chamber 11. The oil-containing waste gas generated during the regeneration process enters the VOC treatment tank 14. The VOC treatment tank 14 is connected to the heat exchanger 17 through the compressor 15 and the expansion valve 16 to form a heat pump system. The heat in the heat-containing waste gas and the air is used by the heat pump system to heat the oil containing trace water.

[0050] The working principle and steps of the treatment system and treatment method of the above oil-containing sewage treatment system of the present invention are as follows: The oily sewage is precipitated in the sedimentation tank to remove large-mass particles and scum, and then is pumped into the inlet of the ejector 4 by the water pump 3. A grille 1 and a screen 2 are placed at the inlet of the water pump 3. The grille 1 is a flat fine grille 1, which can remove impurities with a particle size larger than 3 mm; the screen 2 is a 100-mesh screen 2, which can remove impurities with a particle size larger than 0.1 mm. After the high-pressure oily sewage enters the ejector 4, a local vacuum will be formed, sucking in air. The air is mixed with the oily sewage in the expansion section to form bubbles, and enters the V-type oil separator through the oily sewage inlet pipe 6. An ultrasonic generator and an ultrasonic transducer are installed at the inlet of the oil separator. It has two main functions. One is to generate smaller bubbles in the oily sewage under the action of ultrasonic waves, which is beneficial to oil removal by the air flotation method; the other is to break the emulsification phenomenon of "oil-in-water" and "water-in-oil". Then, under the action of the toughened glass corrugated plate 7, the oil droplets float to the water surface, and the water passes through the lower part of the corrugated plate and enters the overflow tank. The water in the overflow tank overflows and can then be discharged by the outlet pipe 9. Using the toughened glass corrugated plate 7 with a lower floating height can effectively increase the floating area of the oil droplets. At the same time, due to the smaller equivalent diameter of the plate group, the oily sewage with a larger flow rate will be kept in a laminar flow state, so that the smaller oil droplets will adhere to its bed layer and then coalesce into larger oil droplets for separation. A sewage discharge pipe 8 is installed below the V-type oil separator for discharging the precipitated sludge. The floating oil on the water surface is discharged by the oil outlet pipe 10 and pumped into the vacuum separator 19 through the heat exchanger 17. Since the saturated vapor pressure of oil is much smaller than that of water at the same temperature, the water is evaporated into water vapor and pumped away by the water ring vacuum pump 18. After the water in the oil is removed, it is sent to the storage oil tank 20. The water in the outlet pipe 9 enters the activated carbon adsorption chamber 11. The trace oil in the water is adsorbed and reaches the discharge standard, and then is discharged by the drain pipe 12. The activated carbon adsorption chamber 11 has one standby unit, and microwave generators 13 are respectively installed for regeneration. The oily waste gas generated during the regeneration process enters the VOC treatment tank 14. The VOC treatment tank 14 is divided into upper and lower chambers. The upper chamber is the adsorption chamber, and the lower chamber is the condensation chamber. The VOC waste gas enters from the condensation chamber and is cooled and condensed through the finned tube evaporator arranged inside it. The non-condensable gas enters the adsorption chamber, and the organic matter inside it is adsorbed and then discharged into the atmosphere. The evaporator in the lower condensation chamber of the VOC treatment tank 14 is connected to the heat exchanger 17 through the compressor 15 and the expansion valve 16 to form a heat pump system. The heat in the hot waste gas and the air can be used to heat the oil containing trace water through the heat pump system to achieve the purpose of energy saving.

[0051] The above is only the preferred specific implementation mode of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An oily sewage treatment system, characterized in that, Comprising: A sedimentation tank for sedimenting oily sewage; A V-type oil separation tank; An ejector for ejecting the oily sewage sedimented by the sedimentation tank into the V-type oil separation tank after passing through an ultrasonic device; An oil outlet pipe communicating with the V-type oil separation tank for discharging the floating oil in the V-type oil separation tank into a heat exchanger for heat exchange; A vacuum separator communicating with the heat exchanger for removing moisture in the oil; An oil storage tank for storing the oil from which moisture has been removed by the vacuum separator; A water outlet pipe communicating with the V-type oil separation tank for discharging the water in the V-type oil separation tank into an activated carbon adsorption chamber; A VOC treatment tank communicating with the activated carbon adsorption chamber for receiving the oily waste gas generated during the regeneration process of the activated carbon adsorption chamber; The VOC treatment tank has an adsorption chamber and a condensation chamber, and the VOC treatment tank is connected to the heat exchanger through a compressor and an expansion valve respectively to form a heat pump system.

2. The oil-containing sewage treatment system according to claim 1, characterized in that A tempered glass corrugated plate is arranged in the V-type oil separation tank for floating oil droplets to the water surface.

3. An oily sewage treatment system according to claim 1, characterized in that, It further includes a water ring vacuum pump connected to the vacuum separator for pumping away the water vapor separated in the vacuum separator.

4. An oily sewage treatment system according to claim 1, characterized in that, A microwave generator is arranged in the activated carbon adsorption chamber.

5. An oily sewage treatment system according to claim 1, characterized in that, A drain pipe is arranged in the activated carbon adsorption chamber.

6. The oil-containing sewage treatment system according to claim 1, characterized in that It further includes a water pump, a grille and a screen; The water pump is used for pumping the oily sewage through the grille and the screen in sequence and then pumping it into the ejector.

7. The oil-containing sewage treatment system according to claim 1, characterized in that, The ultrasonic device includes an ultrasonic generator and an ultrasonic transducer.

8. An oily sewage treatment system according to any one of claims 1-7, characterized in that, A sewage discharge pipe is installed below the V-type oil separation tank for discharging the sedimented sludge.

9. The treatment method of an oily sewage treatment system according to any one of claims 1-8, characterized in that, Including the following steps: After the oily sewage sedimented by the sedimentation tank enters the ejector, it enters the V-type oil separation tank through the oily sewage inlet pipe. Under the action of the tempered glass corrugated plate, the oil droplets float to the water surface, and the water passes through below the tempered glass corrugated plate and enters the overflow tank. The water in the overflow tank overflows and is discharged through the water outlet pipe; the floating oil on the water surface is discharged through the oil outlet pipe, pumped into the vacuum separator through the heat exchanger, and after the water in the oil is removed, it is sent into the oil storage tank; The water in the water outlet pipe enters the activated carbon adsorption chamber. The trace oil in the water is adsorbed and then discharged up to the discharge standard. The sewage is regenerated in the activated carbon adsorption chamber. The oily waste gas generated during the regeneration process enters the VOC treatment tank. The VOC treatment tank is connected to the heat exchanger through a compressor and an expansion valve to form a heat pump system. The heat-containing waste gas and the heat in the air are used by the heat pump system to heat the oil containing trace water.

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