Hydrophobic gravitational force-based hydrogen flotation oilfield sewage treatment device

Abstract

The invention relates to a hydrogen flotation oilfield sewage treatment device based on hydrophobic attraction, which comprises a water electrolysis device, and an electrolyte is arranged in the water electrolysis device; the oxygen sewage treatment device and the hydrogen sewage treatment device are connected through a communicating pipe, the oxygen sewage treatment device is connected with the positive electrode end of the water electrolysis device through a gas inlet channel, and the hydrogen sewage treatment device is connected with the negative electrode end of the water electrolysis device through another gas inlet channel; an oil field sewage inlet is formed in the oxygen sewage treatment device; the oxygen sewage treatment device and the hydrogen sewage treatment device are respectively connected with the combustion device through a gas outlet channel; the combustion device is connected with the water electrolysis device through a circulating pipeline; the oxygen sewage treatment device and the hydrogen sewage treatment device are both provided with microbubble generation channels, and the microbubble generation channels are communicated with the gas inlet channel. The device has an excellent treatment effect, and is favorable for realizing cost reduction, benefit increase, energy conservation and emission reduction in oilfield production.

Description

Technical Field

[0001] The invention relates to a hydrogen flotation oilfield sewage treatment device based on hydrophobic attraction, belonging to the technical field of oilfield sewage treatment. Background Art

[0002] As oilfield development enters the middle and late stages and tertiary oil recovery technology is applied, polymer flooding and surfactant flooding have become important methods and means to improve oil recovery. However, while polymer flooding and surfactant flooding improve oil recovery, they also produce a large amount of oily wastewater. And because of the residual polymers and surfactants, this type of wastewater has the characteristics of high emulsification and strong stability, which makes oil-water separation more difficult. As a commonly used physical treatment technology for oily wastewater, flotation has the characteristics of small equipment size, strong processing capacity, high efficiency, and mature technology. It has been widely used. This type of technology usually involves the interaction between bubbles and oil droplets at the microscale and the mechanical interaction characteristics of the surface interface.

[0003] As one of the most promising technologies for hydrogen production, water electrolysis may become an important way to produce hydrogen in the future. In addition, this technology will also produce a large number of micro-nano bubbles when producing hydrogen, which may be beneficial to flotation treatment. However, there are also many problems in actual electrolysis, such as large reaction current, gas precipitation and severe bubble adhesion on the surface of the gas evolution electrode, which prevents the electrolyte from smoothly diffusing to the catalytic interface, reduces the electrochemical active reaction area, hinders the further occurrence of the electrolysis reaction, and inhibits the catalytic efficiency.

[0004] How to combine flotation with electrolyzed water and apply it to oily wastewater is an urgent problem that needs to be solved. Summary of the invention

[0005] In view of the above technical problems, the present invention provides a hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction. The device generates oxygen and hydrogen by electrolyzing water. The oxygen is first used to aerate the oily wastewater to promote aerobic bacteria to degrade organic pollutants. Subsequently, the hydrophobic attraction and flotation effect between hydrogen and oil droplets are used for flotation to bring the oil droplets and other impurities in the wastewater to the surface of the water, thereby achieving effective oil-water separation and excellent treatment effects.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction, comprising:

[0008] A water electrolysis device, wherein an electrolyte is arranged in the water electrolysis device;

[0009] An oxygen sewage treatment device and a hydrogen sewage treatment device, the two are connected by a connecting pipe, the oxygen sewage treatment device is connected to the positive terminal of the water electrolysis device through a gas inlet channel, the hydrogen sewage treatment device is connected to the negative terminal of the water electrolysis device through another gas inlet channel, and the oxygen sewage treatment device is provided with an oilfield sewage inlet;

[0010] The oxygen sewage treatment device and the hydrogen sewage treatment device are respectively connected to the combustion device through a gas outlet channel, and the combustion device is connected to the water electrolysis device through a circulation pipeline; the oxygen sewage treatment device and the hydrogen sewage treatment device are both provided with a microbubble generating channel, and the microbubble generating channel is connected to the gas inlet channel.

[0011] In the above-mentioned hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction, preferably, the microbubble generating channel comprises a plurality of microbubble generating gas channels, and the plurality of microbubble generating gas channels are evenly distributed in the circumferential direction around an axis.

[0012] In the above-mentioned hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction, preferably, a plurality of said microbubble generating gas channels are arranged in a "M" shape around an axis.

[0013] In the above-mentioned hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction, preferably, the microbubble generating gas channel is a hollow tubular structure, and micro-nano-scale pores are distributed on the tube wall.

[0014] In the hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction, preferably, a baffle is provided in the water electrolysis device, and the baffle separates the positive and negative electrodes of the water electrolysis device.

[0015] In the hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction, preferably, one end of the baffle is fixed to the inner wall of the water electrolysis device, and a gap is left between the other end and the inner wall of the water electrolysis device.

[0016] In the hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction, preferably, the electrolyte is an alkaline sodium dodecyl sulfate solution.

[0017] In the hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction, preferably, the electrolyte is a mixed solution of sodium dodecyl sulfate and sodium hydroxide.

[0018] In the hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction, preferably, the electrolyte is a mixed solution of 0.1mM-0.3mM sodium dodecyl sulfate and 20-30% mass concentration of sodium hydroxide.

[0019] In the hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction, preferably, the electrolyte is a mixed solution of 0.2 mM sodium dodecyl sulfate and 26% mass concentration of sodium hydroxide.

[0020] The present invention adopts the above technical solution, which has the following advantages:

[0021] 1. The present invention treats oilfield wastewater respectively by oxygen and hydrogen generated by electrolysis of water, thereby improving the wastewater treatment effect; the microbubble gas generating channel with pores generates a large number of bubbles with small diameters, thereby improving the aeration effect and the probability of adhesion between bubbles and oil droplets, and the oily wastewater treatment efficiency is higher.

[0022] 2. The present invention uses 0.2mM sodium dodecyl sulfate and 26% mass concentration NaOH solution as the electrolyte to relieve the adhesion of bubbles on the electrode surface, improve the efficiency of electrolytic bubble generation, and also improve the efficiency of oily wastewater treatment. At the same time, the device can also burn the generated hydrogen and oxygen through the combustion device to output heat energy for other purposes in oil field production, and the generated water is continued to be used for electrolysis, which is conducive to achieving cost reduction, efficiency improvement, energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a hydrogen flotation oilfield wastewater treatment device provided in one embodiment of the present invention;

[0024] Figure 2 A schematic diagram of an oxygen wastewater treatment device provided in this embodiment of the present invention;

[0025] Figure 3 A schematic diagram of a microbubble generating gas channel provided in this embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of measuring the interaction between oil droplets and hydrogen bubbles in a 100 mM NaCl solution with a continuous phase by atomic force microscopy in Example 1 of the present invention;

[0027] Figure 5 is a graph of the interaction force between oil droplets and hydrogen bubbles in a 100 mM NaCl solution as the continuous phase in Example 1 of the present invention;

[0028] Figure 6 1 mM NaNO at different pH values ​​of the continuous phase in Example 2 of the present invention 3 The interaction force curve between hydrogen bubbles in the solution and the surface of the platinum sheet, where the pH value of Figure a is 2.0, the pH value of Figure b is 3.2, the pH value of Figure c is 4.5, the pH value of Figure d is 6.1, the pH value of Figure e is 8.0, and the pH value of Figure f is 9.0;

[0029] Figure 7500 mM NaNO under different concentrations of sodium dodecyl sulfate in the continuous phase in Example 3 of the present invention 3 The interaction force curves between hydrogen bubbles in the solution and the surface of the platinum sheet, where the concentration of sodium dodecyl sulfate in Figure a is 0.005 mM, the concentration of sodium dodecyl sulfate in Figure b is 0.01 mM, the concentration of sodium dodecyl sulfate in Figure c is 0.05 mM, and the concentration of sodium dodecyl sulfate in Figure d is 0.2 mM;

[0030] The reference numerals in the figures are as follows:

[0031] 1-input power supply; 2-electrolysis water device; 3-gas inlet channel; 4-microbubble generating channel; 5-oilfield sewage inlet; 6-treated water outlet; 7-oil sewage outlet; 8-connecting pipe; 9-oxygen sewage treatment device; 10-hydrogen sewage treatment device; 11-gas outlet channel; 12-combustion device; 13-circulation pipeline; 14-baffle; 15-pore; 16-microbubble generating gas channel; 17-probe cantilever; 18-substrate; 19-oil droplet; 20-hydrogen bubble; 21-piezoelectric ceramic. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work are within the scope of protection of the present invention.

[0033] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second", "third", "fourth" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0034] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside", "outside", "inner side", "outer side", "below", "above", etc. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0035] As oilfield development enters the middle and late stages and tertiary oil recovery technology is applied, polymer flooding and surfactant flooding have become important methods and means to improve oil recovery. However, while polymer flooding and surfactant flooding improve oil recovery, they also produce a large amount of oily wastewater. And because of the residual polymers and surfactants, this type of wastewater has the characteristics of high emulsification and strong stability, which makes oil-water separation more difficult. As a commonly used physical treatment technology for oily wastewater, flotation has the characteristics of small equipment size, strong processing capacity, high efficiency, and mature technology. It has been widely used. This type of technology usually involves the interaction between bubbles and oil droplets at the microscale and the mechanical interaction characteristics of the surface interface. How to combine flotation with electrolyzed water and apply it to oily wastewater is an urgent problem to be solved.

[0036] Based on the above technical problems, the present invention provides a hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction. The device has reliable principle, strong treatment capacity and good effect, provides a new idea for oilfield wastewater treatment and has broad market prospects.

[0037] like Figure 1 As shown, the hydrogen flotation oilfield wastewater treatment device involved in the present invention includes: a water electrolysis device 2, a connecting pipe 8, an oxygen wastewater treatment device 9, a hydrogen wastewater treatment device 10, a combustion device 12, a circulation pipeline 13 and a baffle 14.

[0038] Specifically, the water electrolysis device 2 is connected to the microbubble generating channel 4 through the gas inlet channel 3 and is respectively placed at the bottom of the oxygen sewage treatment device 9 and the hydrogen sewage treatment device 10; the oxygen sewage treatment device 9 is connected to the hydrogen sewage treatment device 10 through the connecting pipe 8; the oxygen sewage treatment device 9 and the hydrogen sewage treatment device 10 are respectively connected to the combustion device 12 through the gas outlet channel 11; the combustion device 12 is connected to the water electrolysis device 2 through the circulation pipeline 13.

[0039] Furthermore, the electrolyte in the water electrolysis device 2 is a NaOH solution with a mass concentration of 26% and 0.2 mM sodium dodecyl sulfate, and the electrode is a platinum electrode with a purity of 99.999%.

[0040] Furthermore, if Figure 1 As shown, the baffle 14 is located in the middle of the water electrolysis device 2, and the lower end is not completely blocked.

[0041] Furthermore, if Figure 2 As shown, the microbubble generating channel 4 is composed of microbubble generating gas channels 16 arranged in a "M" shape.

[0042] Furthermore, if Figure 3 As shown, micro-nano-scale pores 15 are densely distributed on the microbubble generating gas channel 16 .

[0043] Furthermore, if Figure 1 As shown, the oxygen sewage treatment device 9 includes two oilfield sewage inlets 5 at the lower end, is connected to the hydrogen sewage treatment device 10 through a connecting pipe 8 on the right side, and is connected to the combustion device 12 at the upper part through a gas outlet channel 11; the hydrogen sewage treatment device 10 is connected to the oxygen sewage treatment device 9 through a connecting pipe 8 on the left side, and has an oil sewage outlet 7 and a treated water outlet 6 on the upper and lower sides of the right side, and is connected to the combustion device 12 at the upper part through the gas outlet channel 11.

[0044] During actual use, water electrolysis reaction occurs in the water electrolysis device 2 to generate hydrogen and oxygen; hydrogen and oxygen are isolated by the baffle 14 to avoid safety problems, and the bottom is not completely blocked to ensure that the electrolyte flows in the water electrolysis device 2; the generated oxygen and hydrogen enter the microbubble generating channel 4 from the gas inlet channel 3, and the gas generates a large number of micro-nano bubbles when passing through the microbubble generating gas channel 16.

[0045] The oilfield sewage enters the oxygen sewage treatment device 9 from the oilfield sewage inlet 5, and is aerated under the action of a large number of micro-nano oxygen bubbles to promote aerobic bacteria to degrade organic pollutants. Subsequently, after the first round of aeration treatment, the oilfield sewage reaches the preset liquid level and enters the hydrogen sewage treatment device 10 from the connecting pipe 8, and the treated water outlet 6 is closed at this time. As the oilfield sewage level in the hydrogen sewage treatment device 10 rises, a large number of micro-nano hydrogen bubbles generated by the bottom micro-bubble generating gas channel 16 float up and collide with the micro-nano oil droplets in the oilfield sewage, adhere under the strong hydrophobic attraction, and are brought to the liquid surface as the hydrogen bubbles float up. At the same time, in the process of hydrogen bubbles floating up, other impurities in the sewage, such as fine solid particles, will also be brought out of the water surface. When the liquid level in the hydrogen sewage treatment device 10 reaches the preset height and has been treated for a period of time, the oil pollution outlet 7 and the treated water outlet 6 are opened, the oil pollution is discharged from the upper oil pollution outlet 7 and recycled for secondary treatment, and the treated water is discharged from the treated water outlet 6 for formation reinjection or other purposes in oilfield production.

[0046] Oxygen and hydrogen complete the oilfield wastewater treatment in the oxygen wastewater treatment device 9 and the hydrogen wastewater treatment device 10 respectively, and then enter the combustion device 12 from the gas outlet channel 11; the combustion process generates a large amount of heat energy, which is used for oilfield production, such as crude oil heating, gathering and transportation or other production activities, reducing oilfield energy consumption, production costs and carbon dioxide emissions; the water generated after the combustion of oxygen and hydrogen re-enters the water electrolysis device 2 through the circulation pipeline 13 and continues to be used for water electrolysis reaction.

[0047] In the process of water electrolysis, since the electrolyte uses a NaOH solution with a mass concentration of 0.2 mM sodium dodecyl sulfate and 26%, and the electrode uses a platinum electrode with a purity of 99.999%, in the process of generating hydrogen, the sodium dodecyl sulfate is adsorbed on the surface of the hydrogen bubbles, and the resulting steric hindrance effect makes it difficult for the hydrogen bubbles to adhere to the surface of the platinum electrode, thereby improving the efficiency of hydrogen generation.

[0048] In the implementation process of the present invention, the adhesion of hydrogen bubbles and oil droplets has a great influence on the treatment effect of oilfield wastewater, which is the theoretical basis for the smooth implementation of the present invention. The following example 1 illustrates the collision process of hydrogen bubbles and oil droplets. The selected electrolyte 0.2mM sodium dodecyl sulfate mass concentration 26% NaOH solution has a great influence on the adhesion of bubbles on the electrode surface, affecting the bubble generation efficiency. The following examples 2 and 3 illustrate the advantages, reasons and mechanism of action of selecting this solution as the electrolyte.

[0049] Combination Figure 4 In Example 1, an atomic force microscope was used to directly measure the interaction force between micron-sized oil droplets and hydrogen bubbles in a 100mM NaCl solution. A silicon wafer was used as a substrate 18, and oil droplets were sprayed on the substrate 18 with an ultra-sharp syringe to form fine oil droplets with a diameter of tens of microns. The continuous phase 100mM NaCl droplets with a diameter of several millimeters were slowly covered on the surface of the substrate 18 silicon wafer with tiny oil droplets; hydrogen was extracted with another ultra-sharp syringe, and hydrogen bubbles with a diameter of tens of microns were also generated in the continuous phase droplets on the surface of the substrate 18 silicon wafer; thus, an environment was created in which the 100mM NaCl solution was the continuous phase, and the oil droplets and hydrogen bubbles were the dispersed phases.

[0050] After the substrate and probe of the atomic force microscope are installed, there are several oil droplets and hydrogen bubbles with a diameter of tens of microns in the 100mM NaCl solution on the substrate; select oil droplets and hydrogen bubbles of appropriate size, and use the probe cantilever 17 to contact the oil droplets on the substrate. Since the probe cantilever 17 is more lipophilic, the oil droplets on the substrate are transferred to the probe cantilever 17, and the position of the probe cantilever 17 is raised so that the oil droplets are located above the hydrogen bubbles, as shown in FIG. Figure 4 shown.

[0051] Example 1: Verification of the interaction force between oil droplets and hydrogen bubbles in a liquid environment

[0052] The oil droplet is set to collide downward at a speed of 1 μm / s, and the maximum interaction force is set. After the atomic force microscope reaches this force, the oil droplet stops approaching the hydrogen bubble and starts to withdraw and separate. The maximum interaction force is set to 5 nN. The force curve of the measurement result is shown in the figure. Figure 5 shown.

[0053] exist Figure 5In the figure, a positive force represents that the interaction force is repulsive, and a negative force represents that the interaction force is attractive. In the process of measuring the interaction between oil droplets and hydrogen bubbles, as the oil droplets approach the hydrogen bubbles, they are far apart at first and no force is measured, which is displayed as 0nN. As they get closer, a weak positive force is measured first, which is a weak repulsive force, and then a large negative force is immediately measured, which is a strong attractive force. Subsequently, the oil droplets and hydrogen bubbles immediately gather and adhere to each other. In this process, the weak repulsive force is the weak fluid resistance generated by liquid drainage, and the strong attractive force is the hydrophobic attraction between the oil droplets and the hydrogen bubbles according to the extended DLVO theory.

[0054] It can be known from the above Example 1 that once the oil droplets and hydrogen bubbles come into contact and collide, they will immediately aggregate and adhere to each other under the action of a strong hydrophobic attraction; this result provides a strong theoretical support for the present invention.

[0055] Example 2: Testing 1 mM NaNO at different pH values 3 Interaction of hydrogen bubbles in solution with platinum surface

[0056] Using a similar method as described above, 1 mM NaNO at different pH values ​​was added. 3 In the solution, an atomic force microscope probe was used to pick up a micron-sized hydrogen bubble, and the driving speed was set to 1 μm / s. The interaction between the micron-sized hydrogen bubble and the surface of the platinum substrate was tested by atomic force microscopy. The force curve of the measurement result is shown in Figure 1. Figure 6 shown. Figure 6 1 mM NaNO 3 From left to right and from top to bottom, the pH values ​​of the solution are 2.0, 3.2, 4.5, 6.1, 8.0, and 9.0, respectively, transitioning from an acidic environment to an alkaline environment.

[0057] Figure 6 In the experiment, when the pH value was 2.0 and 3.2, the atomic force microscope drove the hydrogen bubbles to interact with the surface of the platinum sheet. A weak repulsive force was first measured, which was caused by fluid dynamics. Then, under a strong attractive force, it was immediately attached to the surface of the platinum sheet, mainly due to hydrophobic attraction. This means that in an acidic environment, hydrogen bubbles are easy to attach to the surface of the platinum electrode, which is not conducive to the precipitation of gas from the surface, and the gas evolution efficiency will be lower. When the pH value was 4.5, 6.1, 8.0, and 9.0, during the entire interaction process between the hydrogen bubbles and the surface of the platinum sheet, it was almost all repulsive force, and there was no phenomenon of hydrogen bubbles attaching to the surface of the platinum sheet. This means that hydrogen bubbles are less likely to attach to the surface of the platinum sheet in an alkaline environment, which will be conducive to gas precipitation. Therefore, a NaOH solution with a mass concentration of 26% was used as the basis in the electrolyte.

[0058] Example 3: Testing 500 mM NaNO at different concentrations of sodium dodecyl sulfate 3 Interaction between hydrogen bubbles in solution and the surface of platinum sheet

[0059] By a similar method, 500 mM NaNO in the presence of different concentrations of sodium dodecyl sulfate was used. 3 In the solution, an atomic force microscope probe was used to pick up a micron-sized hydrogen bubble, and the driving speed was set to 1 μm / s. After waiting for fifteen minutes, the atomic force microscope was used to test the interaction between the micron-sized hydrogen bubble and the surface of the platinum substrate. The force curve of the measurement result is shown in Figure 1. Figure 7 shown. Figure 7 500 mM NaNO 3 From left to right and from top to bottom, the concentrations of sodium dodecyl sulfate in the solution are 0.005 mmol, 0.01 mmol, 0.05 mmol, and 0.2 mmol, respectively, and the concentrations increase successively.

[0060] Figure 7 In the experiment, when the concentration of sodium dodecyl sulfate was 0.005mmol, 0.01mmol, and 0.05mmol, the atomic force microscope drove the hydrogen bubbles to interact with the surface of the platinum sheet, and a weak repulsive force was measured first, and then the bubbles immediately attached to the surface of the platinum sheet under a strong hydrophobic attraction. This means that in 500mM NaNO 3 In the 0.005mmol, 0.01mmol, and 0.05mmol sodium dodecyl sulfate solutions, hydrogen bubbles easily adhere to the surface of the platinum electrode, which will be detrimental to the gas precipitation from the surface and reduce the gas evolution efficiency. When the sodium dodecyl sulfate concentration is 0.2mmol, during the measurement of the interaction between the hydrogen bubbles and the surface of the platinum sheet, except for the weak fluid attraction, it is always a repulsive force. This part of the weak fluid attraction is not enough to make the hydrogen bubbles adhere to the surface of the platinum sheet, and there is no phenomenon of hydrogen bubbles adhering to the surface of the platinum sheet. This means that the hydrogen bubbles at this sodium dodecyl sulfate concentration are not easy to adhere to the surface of the platinum sheet, which is conducive to gas precipitation. Therefore, the final electrolyte uses a 0.2mM sodium dodecyl sulfate mass concentration of 26% NaOH solution.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction, characterized in that: include: A water electrolysis device (2), wherein an electrolyte is arranged in the water electrolysis device (2); An oxygen wastewater treatment device (9) and a hydrogen wastewater treatment device (10) are connected via a connecting pipe (8); the oxygen wastewater treatment device (9) is connected to the positive terminal of the water electrolysis device (2) via a gas inlet channel (3); the hydrogen wastewater treatment device (10) is connected to the negative terminal of the water electrolysis device (2) via another gas inlet channel (3); and the oxygen wastewater treatment device (9) is provided with an oilfield wastewater inlet (5); The oxygen sewage treatment device (9) and the hydrogen sewage treatment device (10) are respectively connected to the combustion device (12) via a gas outlet channel (11), and the combustion device (12) is connected to the water electrolysis device (2) via a circulation pipeline (13); the oxygen sewage treatment device (9) and the hydrogen sewage treatment device (10) are both provided with a microbubble generating channel (4), and the microbubble generating channel (4) is communicated with the gas inlet channel (3).

2. The hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction according to claim 1 is characterized in that: The microbubble generating channel (4) comprises a plurality of microbubble generating gas channels (16), and the plurality of microbubble generating gas channels (16) are evenly distributed in a circumferential direction around an axis.

3. The hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction according to claim 2 is characterized in that: A plurality of microbubble generating gas channels (16) are arranged in a "M" shape around an axis.

4. The hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction according to claim 2 is characterized in that: The microbubble generating gas channel (16) is a hollow tubular structure, and micro-nano-scale pores (15) are distributed on the tube wall.

5. The hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction according to claim 1 is characterized in that: A baffle (14) is provided inside the water electrolysis device (2), and the baffle (14) separates the positive and negative electrodes of the water electrolysis device (2).

6. The hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction according to claim 5 is characterized in that: One end of the baffle (14) is fixed to the inner wall of the water electrolysis device (2), and a gap is left between the other end and the inner wall of the water electrolysis device (2).

7. The hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction according to claim 1 is characterized in that: The electrolyte is an alkaline sodium dodecyl sulfate solution.

8. The hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction according to claim 7 is characterized in that: The electrolyte is a mixed solution of sodium dodecyl sulfate and sodium hydroxide.

9. The hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction according to claim 8 is characterized in that: The electrolyte is a mixed solution of 0.1mM-0.3mM sodium dodecyl sulfate and 20-30% mass concentration of sodium hydroxide.

10. The hydrogen flotation oilfield wastewater treatment device based on hydrophobic attraction according to claim 9, characterized in that: The electrolyte is a mixed solution of 0.2 mM sodium dodecyl sulfate and 26% mass concentration sodium hydroxide.

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