Oil-water separation device and oily wastewater treatment system comprising same

Abstract

The utility model provides an oil-water separation device and an oily wastewater treatment system comprising the same, and relates to the technical field of wastewater treatment. The oil-water separation device comprises a separation tank, an ultrasonic vibration device, a gas dissolving device and an oil collecting tank. Wherein the separation tank is of a tank body structure, and a partition plate for dividing the separation tank into a flotation area and a clear water area is arranged in the tank body; the ultrasonic vibration device comprises an ultrasonic transduction releaser for generating vibration ultrasonic waves; the air dissolving device comprises a dissolved air releaser for releasing a steam-water mixture; the oil collecting tank is arranged in the separation tank body in a floating manner, is positioned between water and oil, and is used for collecting separated oil. According to the oil-water separation device, no chemical agent needs to be added in the operation process, on one hand, the agent expenditure can be reduced, on the other hand, oil-containing solid waste can be effectively prevented from being generated, and then the problems of follow-up treatment environment risk and high cost are solved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to an oil-water separation device and an oily wastewater treatment system including the same. Background Art

[0002] Oily wastewater refers to wastewater containing lipids, soaps, mineral oils, and animal and vegetable oils. It mainly comes from the discharge of oilfield wastewater, oil refineries, petrochemical plants, metal processing, coking, video processing and other enterprises.

[0003] Currently, the main methods for treating oily wastewater in China include gravity separation, coagulation, and filtration / adsorption. However, all of these methods have certain technical limitations. For example:

[0004] Gravity separation utilizes the density difference between oil and water, causing oil droplets dispersed in the water to slowly rise and separate under buoyancy. However, the separation speed is affected by factors such as density difference and viscosity, resulting in a very slow separation rate, and dissolved oil in the water cannot be removed. Coagulation treatment involves adding coagulants to the water, which form flocs that adsorb the oil. Air flotation then lifts these flocs to the surface, forming scum, thus separating the oil and water. However, this process produces a large amount of flocculent sludge that needs to be treated as hazardous waste, leading to high treatment costs. Filtration and adsorption remove oil from wastewater through filter media, utilizing their retention and screening properties. However, the cost of replacing the filter media and disposing of it after oil adsorption represents a significant expense.

[0005] In view of this, the present utility model is proposed. Utility Model Content

[0006] The primary objective of this invention is to provide an oil-water separation device that does not require the addition of any chemical reagents during operation. This reduces reagent costs and effectively prevents the generation of oily solid waste, thereby avoiding environmental risks and high costs associated with subsequent treatment.

[0007] The second objective of this invention is to provide an oily wastewater treatment system, which includes the aforementioned oil-water separation device.

[0008] This utility model provides an oil-water separation device, which includes: a separation tank, an ultrasonic vibration device, a gas dissolving device, and an oil collection tank;

[0009] The separation tank is a tank structure, and a partition is provided in the tank to divide the separation tank into a flotation zone and a clear water zone. The water level in the separation tank during operation is higher than the horizontal height of the partition.

[0010] The ultrasonic vibration device includes an ultrasonic transducer and an ultrasonic control device. The ultrasonic transducer is located at the bottom of the flotation zone of the separation tank and is used to generate vibrating ultrasonic waves.

[0011] The dissolved gas device includes a dissolved gas tank and a dissolved gas release device. The dissolved gas release device is located in the middle and bottom layer of the flotation zone of the separation tank and is used to release the gas-water mixture.

[0012] The oil collection tank is floatingly installed in the separation tank, positioned between the water and oil, and is used to collect the separated oil.

[0013] Furthermore, the oil-water separation device also includes a water pump;

[0014] The water pump is used to pump water from the clear water zone of the separation tank into the dissolved air tank to form a steam-water mixture.

[0015] Furthermore, the dissolved gas tank and the dissolved gas release device are connected by a pipeline, and the gas-water mixture formed in the dissolved gas tank is passed into the dissolved gas release device for release.

[0016] Furthermore, the ultrasonic vibration device also includes an ultrasonic control device for controlling the ultrasonic waves generated by the ultrasonic emitter.

[0017] Furthermore, the separation tank is provided with an inlet and an outlet; the inlet is equipped with an electric inlet regulating valve, and the outlet is equipped with an electric outlet regulating valve.

[0018] Furthermore, after the wastewater enters the separation tank through the inlet, it is guided to the bottom of the flotation zone of the separation tank through the water distribution pipeline and discharged through the water distribution hole at the outlet of the water distribution pipeline.

[0019] The water distribution holes are evenly distributed directly above the ultrasonic transducer release device at the bottom of the flotation zone.

[0020] Furthermore, the oil-water separator is also equipped with a level gauge, which is interlocked with the inlet electric regulating valve and the outlet electric regulating valve.

[0021] Furthermore, a horizontal edge is provided on the outer edge of the cross-section of the oil collection groove.

[0022] Furthermore, two lifting rods with end caps at the bottom are provided on the horizontal edge of the oil collection tank. The lifting rods pass through the horizontal edge of the oil collection tank and are fixed to the tank wall of the separation tank, so that the oil collection tank can only move up and down.

[0023] This utility model provides an oily wastewater treatment system, which includes the above-mentioned oil-water separation device.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] This utility model provides an oil-water separation device, comprising: a separation tank, an ultrasonic vibration device, a dissolved air device, and an oil collection tank. The separation tank is a tank structure with a partition dividing it into a flotation zone and a clear water zone. During operation, the water level in the separation tank is higher than the level of the partition. The ultrasonic vibration device includes an ultrasonic transducer releaser, located at the bottom of the flotation zone of the separation tank, for generating ultrasonic vibrations. The dissolved air device includes a dissolved air releaser, located in the middle and bottom layer of the flotation zone of the separation tank, for releasing the gas-water mixture. The oil collection tank is floating within the separation tank, positioned between the water and oil, for collecting the separated oil.

[0026] In the treatment of oily wastewater, after the wastewater enters the separation tank, it is evenly distributed at the bottom of the flotation zone through water distribution holes. The aforementioned oil-water separation device treats the oily wastewater through an ultrasonic transducer and a dissolved gas releaser installed in the flotation zone of the separation tank. Under the action of ultrasound, the oily wastewater generates high-frequency mechanical longitudinal wave vibrations. Due to the different properties of water and oil, the vibration amplitude and longitudinal wave transmission speed of the molecules differ under the action of ultrasound, thus promoting the separation of mutually dissolved water molecules and oil molecules. At the same time, a large number of microbubbles generated by the dissolved gas releaser, under the action of interfacial tension and bubble buoyancy, cause the separated oil droplets to adhere to the microbubbles and float to the water surface. The oil droplets that float to the surface collect to form an oil layer, which then flows into the oil collection tank and is discharged.

[0027] Therefore, the oil-water separation device of this utility model does not require the addition of any chemical reagents during operation, which can reduce the cost of reagents and effectively avoid the generation of oily solid waste, thereby avoiding the environmental risks and high costs of subsequent treatment.

[0028] The oily wastewater treatment system provided by this utility model includes the aforementioned oil-water separation device. Due to the technical advantages of the oil-water separation device, this oily wastewater treatment system has the advantages of requiring no chemical additives, generating no oily solid waste, and having low economic cost for wastewater treatment. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1This is a schematic diagram of the longitudinal section structure of the oil-water separation device provided in Embodiment 1 of this utility model;

[0031] Figure 2 This is a cross-sectional structural diagram of the oil-water separation device provided in Embodiment 1 of this utility model;

[0032] Figure 3 This is a schematic diagram of the oil collection tank structure provided in Embodiment 1 of this utility model.

[0033] Icons: 1-Separation tank; 2-Ultrasonic vibration device; 3-Water pump; 4-Dissolving gas device; 5-Oil collection tank; 6-Level gauge; 21-Ultrasonic transducer; 22-Ultrasonic control device; 41-Dissolving gas tank; 42-Dissolving gas release device; 71-Inlet electric regulating valve; 72-Outlet electric regulating valve. Detailed Implementation

[0034] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. To help to better understand this utility model, specific embodiments will now be described in detail.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0038] According to one aspect of the present invention, an oil-water separation device is provided, the oil-water separation device comprising: a separation tank 1, an ultrasonic vibration device 2, a gas dissolving device 4, and an oil collection tank 5.

[0039] The separation tank 1 is a tank structure, and a partition is provided in the tank to divide the separation tank 1 into a flotation zone and a clear water zone. The water level of the separation tank 1 during operation is higher than the horizontal height of the partition.

[0040] The ultrasonic vibration device 2 includes an ultrasonic transducer 21 and an ultrasonic control device 22. The ultrasonic transducer 21 is located at the bottom of the flotation zone of the separation tank 1 and is used to generate vibrating ultrasonic waves.

[0041] The dissolved gas device 4 includes a dissolved gas tank 41 and a dissolved gas release device 42. The dissolved gas release device 42 is located in the middle and bottom layer of the flotation zone of the separation tank 1 and is used to release the gas-water mixture.

[0042] The oil collection tank 5 is floatingly disposed in the tank body of the separation tank 1, located in the middle of the water and oil, and is used to collect the separated oil.

[0043] This utility model provides an oil-water separation device, comprising: a separation tank 1, an ultrasonic vibration device 2, a dissolved air device 4, and an oil collection tank 5. The separation tank 1 is a tank structure with a partition dividing it into a flotation zone and a clear water zone. During operation, the water level in the separation tank 1 is higher than the level of the partition. The ultrasonic vibration device 2 includes an ultrasonic transducer 21, which is located at the bottom of the flotation zone of the separation tank 1 and generates ultrasonic vibrations. The dissolved air device 4 includes a dissolved air release device 42, which is located in the middle and bottom layer of the flotation zone of the separation tank 1 and releases the gas-water mixture. The oil collection tank 5 is floating within the separation tank 1, positioned between the water and oil, and is used to collect the separated oil.

[0044] When treating oily wastewater, after the oily wastewater enters the separation tank 1, it is evenly distributed at the bottom of the flotation zone through the water distribution holes. The oil-water separation device then treats the wastewater through the ultrasonic transducer 21 and dissolved gas releaser 42 installed in the flotation zone of the separation tank 1.

[0045] Specifically, under the action of ultrasound, oily wastewater generates high-frequency mechanical longitudinal wave vibrations. Due to the different properties of water and oil, the vibration amplitude and longitudinal wave transmission speed of molecules differ under the action of ultrasound, thus promoting the separation of mutually dissolved water and oil molecules. Simultaneously, a large number of microbubbles generated by the dissolved gas release device 42, under the action of interfacial tension and bubble buoyancy, cause the separated oil droplets to adhere to the microbubbles and float to the water surface. The oil droplets that float to the surface collect to form an oil layer, which then flows into the oil collection tank 5 and is discharged. Therefore, the oil-water separation device of this invention does not require the addition of any chemical agents during operation, which reduces the cost of chemicals and effectively avoids the generation of oily solid waste, thereby avoiding the environmental risks and high costs of subsequent treatment.

[0046] In a preferred embodiment of the present invention, the oil-water separation device further includes a water pump 3, which is used to pump water from the clear water zone of the separation tank 1 into the dissolved air tank 41 to form a gas-water mixture.

[0047] In a preferred embodiment, the water pump 3 draws water after oil-water separation from the clear water zone of the separation tank 1 and pumps the water into the dissolved air tank 41; simultaneously, compressed air enters from the top of the dissolved air tank 41. Under the combined pressure of the water and compressed air, the water and air in the dissolved air tank 41 are in a steam-water mixed state.

[0048] In a preferred embodiment of the present invention, the dissolved gas tank 41 and the dissolved gas release device 42 are connected by a pipeline, and the gas-water mixture formed in the dissolved gas tank 41 is introduced into the dissolved gas release device 42 for release.

[0049] In a preferred embodiment, the water vapor in the dissolved air tank 41 is in a steam-water mixed state and is discharged through the bottom of the dissolved air tank 41. Then, it is introduced into the dissolved air release device 42 through a pipe to form a large number of microbubbles, so as to form a three-phase mixture of water, gas and the removed substance. The stripped oil droplets will be attached to the microbubbles and float to the water surface.

[0050] In a preferred embodiment of the present invention, the ultrasonic vibration device 2 further includes an ultrasonic control device 22 for controlling the ultrasonic waves generated by the ultrasonic transmitter 21.

[0051] In a preferred embodiment of this utility model, the separation tank 1 is provided with an inlet and an outlet;

[0052] An electric regulating valve 71 for water inlet is installed on the water inlet, and an electric regulating valve 72 for water outlet is installed on the water outlet.

[0053] In a preferred embodiment of this utility model, the oil-water separation device is further provided with a level gauge 6, which is interlocked with the inlet electric regulating valve 71 and the outlet electric regulating valve 72.

[0054] In a preferred embodiment, the level gauge 6 is interlocked with the inlet electric regulating valve 71 and the outlet electric regulating valve 72. Specifically:

[0055] When the liquid level is below the height of the baffle, the opening of the inlet electric regulating valve 71 is automatically increased when the inlet flow rate is less than the designed processing capacity; when the inlet flow rate reaches the designed processing capacity, the opening of the outlet electric regulating valve 72 is automatically decreased. When the liquid level is above the liquid level mark b, the opening of the outlet electric regulating valve 72 is automatically increased when the inlet flow rate is less than the designed processing capacity; when the inlet flow rate reaches the designed processing capacity, the opening of the inlet electric regulating valve 71 is automatically decreased.

[0056] In the preferred embodiment described above, after the wastewater enters the separation tank 1 through the inlet, it is guided to the bottom of the flotation zone of the separation tank 1 through the water distribution pipeline and discharged through the water distribution holes at the outlet of the water distribution pipeline; the water distribution holes are evenly distributed directly above the ultrasonic transducer 21 at the bottom of the flotation zone.

[0057] In a preferred embodiment of this utility model, a horizontal edge is provided on the outer edge of the cross-section of the oil collection groove 5.

[0058] It should be noted that the oil collecting tank 5 of this utility model is hemispherical, designed with a density between that of water and oil. Water has a density of 1 g / ml, while oil typically has a density between 0.91 and 0.93 g / ml. This results in the oil collecting tank 5 having a density of 0.95 g / ml, placing it in the middle position between water and oil. Specifically:

[0059] Density mass formula: ρ=m / V;

[0060] The density setting value ρ is 0.95 g / ml, and V is the selected volume of the hollow hemisphere of the oil collection tank 5. Then, the mass M of the oil collection tank 5 can be calculated according to the density-mass formula.

[0061] In the preferred embodiment described above, two hanging rods with sealed bottoms are provided on the horizontal edge of the oil collection tank 5. The hanging rods pass through the horizontal edge of the oil collection tank 5 and are fixed to the tank wall of the separation tank 1, so that the oil collection tank 5 can only move up and down.

[0062] In a preferred embodiment, the outer edge of the cross-section of the oil collection tank 5 is provided with a horizontal edge, and two guide rods with end caps at the bottom are provided on the horizontal edge, passing through the edge of the oil collection tank 5. The guide rods are fixed to the wall of the separation tank 1, so that the oil collection tank 5 can only move up and down. A lightweight flexible hose (the mass of the hose is negligible) is provided at the bottom of the oil collection tank 5 to guide the collected floating oil out of the separation tank 1. The density of the oil collection tank 5 is between that of water and oil, so that it always floats on the water surface, while the oil layer formed by the separated oil can submerge and enter the oil collection tank 5, achieving precise collection of the separated oil.

[0063] According to one aspect of the present invention, an oily wastewater treatment system is provided, the oily wastewater treatment system comprising the above-mentioned oil-water separation device.

[0064] The oily wastewater treatment system provided by this utility model includes the aforementioned oil-water separation device. Due to the technical advantages of the oil-water separation device, this oily wastewater treatment system has the advantages of requiring no chemical additives, generating no oily solid waste, and having low economic cost for wastewater treatment.

[0065] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0066] Example 1

[0067] Figure 1 This embodiment provides a longitudinal sectional view of the oil-water separation device.

[0068] Figure 2 This embodiment provides a schematic diagram of the cross-sectional structure of the oil-water separation device.

[0069] See also Figure 1 , Figure 2 An oil-water separation device, comprising: a separation tank 1, an ultrasonic vibration device 2, a gas dissolving device 4, and an oil collection tank 5;

[0070] The separation tank 1 is a tank structure, and a partition is provided in the tank to divide the separation tank 1 into a flotation zone and a clear water zone. The water level of the separation tank 1 during operation is higher than the horizontal height of the partition.

[0071] The ultrasonic vibration device 2 includes an ultrasonic transducer 21 and an ultrasonic control device 22. The ultrasonic transducer 21 is located at the bottom of the flotation zone of the separation tank 1 and is used to generate vibrating ultrasonic waves.

[0072] The dissolved gas device 4 includes a dissolved gas tank 41 and a dissolved gas release device 42. The dissolved gas release device 42 is located in the middle and bottom layer of the flotation zone of the separation tank 1 and is used to release the gas-water mixture.

[0073] The oil collection tank 5 is floatingly disposed in the tank body of the separation tank 1, located in the middle of the water and oil, and is used to collect the separated oil.

[0074] This utility model provides an oil-water separation device comprising: a separation tank 1, an ultrasonic vibration device 2, a dissolved air device 4, and an oil collection tank 5. The separation tank 1 is a tank structure with a partition dividing it into a flotation zone and a clear water zone. The ultrasonic vibration device 2 includes an ultrasonic transducer 21 located at the bottom of the flotation zone of the separation tank 1 for generating ultrasonic vibrations. The dissolved air device 4 includes a dissolved air release device 42 located in the middle and bottom layer of the flotation zone of the separation tank 1 for releasing the dissolved air mixture. The oil collection tank 5 is floating within the separation tank 1, positioned between the water and oil, for collecting the separated oil.

[0075] When treating oily wastewater, after the oily wastewater enters the separation tank 1, it is evenly distributed at the bottom of the flotation zone through the water distribution holes. The oil-water separation device then treats the wastewater through the ultrasonic transducer 21 and dissolved gas releaser 42 installed in the flotation zone of the separation tank 1.

[0076] Specifically, under the action of ultrasound, the oily wastewater generates high-frequency mechanical longitudinal wave vibrations. Due to the different properties of water and oil, the vibration amplitude and longitudinal wave transmission speed of the molecules differ under the action of ultrasound, thus promoting the separation of mutually dissolved water molecules and oil molecules. At the same time, a large number of microbubbles generated by the dissolved gas release device 42, under the action of interfacial tension and bubble buoyancy, cause the separated oil droplets to adhere to the microbubbles and float to the water surface. After the oil droplets that float to the surface collect to form an oil layer, they flow into the oil collection tank 5 and are discharged.

[0077] Therefore, the oil-water separation device of this utility model does not require the addition of any chemical reagents during operation, which can reduce the cost of reagents and effectively avoid the generation of oily solid waste, thereby avoiding the environmental risks and high costs of subsequent treatment.

[0078] In a preferred embodiment of this invention, the oil-water separation device further includes a water pump 3, which draws water after oil-water separation from the clear water zone of the separation tank 1 and pumps the water into the dissolved air tank 41; simultaneously, compressed air enters from the top of the dissolved air tank 41. Under the combined pressure of the water and compressed air, the water and air in the dissolved air tank 41 are in a steam-water mixed state.

[0079] In a preferred embodiment of this invention, the water vapor in the dissolved air tank 41 is discharged through the bottom of the dissolved air tank 41 in a steam-water mixture state and then introduced into the dissolved air release device 42 through a pipe. The steam-water mixture is suddenly released from pressure in the flotation zone of the separation tank 1 through the dissolved air release device 42, forming a large number of microbubbles to form a three-phase mixture of water, gas and the removed substances. The stripped oil droplets are attached to the microbubbles and float to the water surface.

[0080] See Figure 2 In a preferred embodiment of this example, the ultrasonic vibration device 2 further includes an ultrasonic control device 22 for controlling the ultrasonic waves generated by the ultrasonic transmitter 21.

[0081] See Figure 1 , Figure 2 In a preferred embodiment of this example, the separation tank 1 is provided with an inlet and an outlet; an electric inlet regulating valve 71 is provided on the inlet, and an electric outlet regulating valve 72 is provided on the outlet.

[0082] Preferably, the oil-water separator is further provided with a level gauge 6, which is interlocked with the inlet electric regulating valve 71 and the outlet electric regulating valve 72.

[0083] See Figure 1 Specifically: When the liquid level is below level mark a (i.e., the height of the baffle), the opening of the inlet electric regulating valve 71 is automatically increased when the inlet flow rate is less than the designed processing capacity; when the inlet flow rate reaches the designed processing capacity, the opening of the outlet electric regulating valve 72 is automatically decreased. When the liquid level is above level mark b, the opening of the outlet electric regulating valve 72 is automatically increased when the inlet flow rate is less than the designed processing capacity; when the inlet flow rate reaches the designed processing capacity, the opening of the inlet electric regulating valve 71 is automatically decreased.

[0084] In the preferred embodiment described above, after the wastewater enters the separation tank 1 through the inlet, it is guided to the bottom of the flotation zone of the separation tank 1 through the water distribution pipeline and discharged through the water distribution holes at the outlet of the water distribution pipeline; the water distribution holes are evenly distributed directly above the ultrasonic transducer 21 at the bottom of the flotation zone.

[0085] In a preferred embodiment of this example, the oil collection tank 5 is hemispherical, designed with a density between that of water and oil. Water has a density of 1 g / ml, while oil typically has a density between 0.91 and 0.93 g / ml. This results in the oil collection tank 5 having a density of 0.95 g / ml, placing it in the middle range between water and oil. Specifically:

[0086] Density mass formula: ρ=m / V;

[0087] The density setting value ρ is 0.95 g / ml, and V is the selected volume of the hollow hemisphere of the oil collection tank 5. Then, the mass M of the oil collection tank 5 can be calculated according to the density-mass formula.

[0088] Figure 3 This is a schematic diagram of the oil collection tank 5 provided in this embodiment.

[0089] See Figure 2 , Figure 3 In a preferred embodiment of this invention, a horizontal edge is provided on the outer edge of the cross-section of the oil collection trough 5, and two hanging rods with end caps at the bottom are provided on the horizontal edge. The hanging rods pass through the horizontal edge of the oil collection trough 5 and are fixed to the wall of the separation tank 1, so that the oil collection trough 5 can only move up and down.

[0090] In a preferred embodiment, the outer edge of the cross-section of the oil collection tank 5 is provided with a horizontal edge, and two guide rods with end caps at the bottom are provided on the horizontal edge, passing through the edge of the oil collection tank 5. The guide rods are fixed to the wall of the separation tank 1, so that the oil collection tank 5 can only move up and down. A lightweight flexible hose (the mass of the hose is negligible) is provided at the bottom of the oil collection tank 5 to guide the collected floating oil out of the separation tank 1. The density of the oil collection tank 5 is between that of water and oil, so that it always floats on the water surface, while the oil layer formed by the separated oil can submerge and enter the oil collection tank 5, achieving precise collection of the separated oil.

[0091] The specific working process of the oil-water separator in this embodiment is as follows:

[0092] Oily wastewater enters the water supply pipe through the inlet electric regulating valve 71 and is evenly distributed into the separation tank 1 through the water distribution holes. At the same time, the ultrasonic vibration device 2 is activated, and the ultrasonic waves generated by the ultrasonic transducer 21 cause the oily wastewater to generate high-frequency mechanical longitudinal wave vibrations under the action of the ultrasonic waves. However, due to the different properties of water and oil, the vibration amplitude and longitudinal wave transmission speed of the molecules are different under the action of ultrasonic waves, which will promote the separation of mutually dissolved water molecules and oil molecules.

[0093] Simultaneously, water pump 3 draws water from the clear water zone of separation tank 1 after oil-water separation and pumps the water into dissolved air tank 41. Compressed air enters from the top of dissolved air tank 41. Under the combined pressure of water and compressed air, the water and air in dissolved air tank 41 are in a steam-water mixture state. The steam-water mixture discharged from the bottom of dissolved air tank 41 is suddenly released in the flotation zone of separation tank 1 through dissolved air release device 42, forming a large number of microbubbles to form a three-phase mixture of water, air, and removed substances. The stripped oil droplets are adhered to the microbubbles and float to the water surface. The separated water passes through the baffle and is discharged from the bottom of the clear water zone.

[0094] In addition, a lightweight hose is installed at the bottom of the oil collection tank 5 to discharge the collected floating oil outside the separation tank 1. The density of the oil collection tank 5 is between that of water and oil, so that it always floats on the water surface, while the oil layer formed by the separated oil can submerge and enter the oil collection tank 5, thus achieving precise collection of the separated oil.

[0095] In summary, the oil-water separation device of this utility model does not require the addition of any chemical reagents during operation. On the one hand, it can reduce the cost of reagents, and on the other hand, it can effectively avoid the generation of oily solid waste, thereby avoiding the environmental risks and high costs of subsequent treatment.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An oil-water separation device, characterized in that: The oil-water separation device comprises: a separation tank, an ultrasonic vibration device, an air dissolving device and an oil collecting tank; The separation tank is a tank structure, in which a partition is arranged to divide the separation tank into a flotation area and a clear water area, and the water level of the separation tank when working is higher than the horizontal height of the partition; The ultrasonic vibration device includes an ultrasonic transducer releaser and an ultrasonic control device. The ultrasonic transducer releaser is arranged at the bottom of the flotation zone of the separation tank and is used to generate vibration ultrasonic waves. The gas dissolving device comprises a gas dissolving tank and a gas dissolving releaser, wherein the gas dissolving releaser is arranged at the middle bottom layer of the flotation zone of the separation tank and is used for releasing the gas-water mixture; The oil collecting tank is floated in the tank body of the separation tank, located in the middle of the water and the oil, and is used to collect the separated oil.

2. The oil-water separation device according to claim 1, characterized in that: The oil-water separation device also includes a water pump; The water pump is used to pump water in the clear water area of ​​the separation tank into the gas dissolving tank to form a gas-water mixture.

3. The oil-water separation device according to claim 1, characterized in that: The gas dissolving tank is connected with the gas dissolving releaser through a pipeline, and the soda-water mixture formed by the gas dissolving tank is passed into the gas dissolving releaser for release.

4. The oil-water separation device according to claim 1, characterized in that: The ultrasonic vibration device also includes an ultrasonic control device for controlling the ultrasonic wave generated by the ultrasonic releaser.

5. The oil-water separation device according to claim 1, characterized in that: The separation tank is provided with a water inlet and a water outlet; The water inlet is provided with an electric water inlet regulating valve, and the water outlet is provided with an electric water outlet regulating valve.

6. The oil-water separation device according to claim 5, characterized in that: After the wastewater enters the separation tank through the water inlet, it is led to the bottom of the flotation area of ​​the separation tank through the water distribution pipeline and discharged through the water distribution holes at the outlet of the water distribution pipeline; The water distribution holes are evenly distributed just above the ultrasonic transducer releaser at the bottom of the flotation area.

7. The oil-water separation device according to claim 5, characterized in that: The oil-water separation device is also provided with a liquid level meter, and the liquid level meter is interlocked and controlled with the water inlet electric regulating valve and the water outlet electric regulating valve.

8. The oil-water separation device according to claim 1, characterized in that: A horizontal edge is arranged on the outer edge of the cross section of the oil collecting groove.

9. The oil-water separation device according to claim 8, characterized in that: Two suspension rods with sealed bottoms are arranged on the horizontal edge of the oil collecting tank. The suspension rods pass through the horizontal edge of the oil collecting tank and are fixed on the wall of the separation tank, so that the oil collecting tank can only move up and down.

10. An oily wastewater treatment system, characterized in that: The oily wastewater treatment system comprises the oil-water separation device according to any one of claims 1 to 9.

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