An oil and gas development sewage treatment device

Abstract

The application relates to the field of oil and gas development sewage treatment, and discloses an oil and gas development sewage treatment device, which comprises a supporting cylinder fixedly installed in the inside of a pressing plate, a feeding cylinder rotatably installed in the inside of the supporting cylinder, an upper feeding cylinder and a discharging pipe fixedly installed at the upper and lower ends of the feeding cylinder respectively, a sealing cylinder fixedly installed at the middle of the inner wall of the supporting cylinder, and a water inlet pipe and a water outlet pipe installed at the upper and lower ends of the sealing cylinder respectively. The device changes the path of sewage entering the device, the sewage enters the sealing cylinder through the water inlet pipe and is discharged through the water outlet pipe, the feeding cylinder is pushed to rotate, the discharging pipe, the fan blade, the stirring rod and the contact plate are driven to rotate, the discharging pipe in rotation can sprinkle the flocculating agent along an annular path and fully contact with the sewage, the contact area of the suspended impurities in the sewage and the flocculating agent is increased, the generation speed of the flocculation is increased, and the speed of the flocculation in the sewage is significantly accelerated.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology in oil and gas development, and more particularly to a wastewater treatment device for oil and gas development. Background Technology

[0002] The wastewater generated during oil and gas development is enormous, making it difficult to store temporarily and highly susceptible to surface environmental pollution. Therefore, wastewater recycling and reuse has become the core approach for wastewater treatment in oil and gas development. When treated to meet standards, this wastewater can be used as fracturing fluid to replenish formation energy and maintain reservoir pressure; it can also serve as an oil displacement medium to drive the migration of crude oil in the formation, thereby improving recovery rates and achieving wastewater reuse.

[0003] In existing wastewater treatment processes, the main method for removing large amounts of suspended solids and other impurities from wastewater is the addition of flocculants. These flocculants react chemically with the suspended solids to form flocculent precipitates. However, the flocculent precipitates formed by the flocculation reaction often have high dispersion, small size, and increased buoyancy due to mixed gases, making it difficult to settle to the bottom of the sedimentation tank. This significantly reduces the efficiency of the wastewater sedimentation and clarification process. The root cause of this problem is the uneven distribution of the flocculants. Increasing the stirring speed to improve mixing uniformity further increases the dispersion of the flocculants, creating a vicious cycle. Therefore, this application aims to improve the reaction rate between the flocculant and suspended solids in wastewater and accelerate flocculent sedimentation, thus overcoming the bottleneck in the sedimentation and clarification process. Summary of the Invention

[0004] This application proposes an oil and gas development wastewater treatment device with high operating efficiency to solve the problems mentioned in the prior art.

[0005] To achieve the above objectives, this application adopts the following technical solution: an oil and gas development wastewater treatment device, comprising:

[0006] A sedimentation tank is equipped with a drain pipe and an overflow pipe on its left and right sides, respectively. A pressure plate is installed on the top of the sedimentation tank, and multiple air inlets are opened on the top of the pressure plate. The inner cavity of the sedimentation tank is used to hold sewage.

[0007] A support cylinder is fixedly installed inside the pressure plate. A feed cylinder is rotatably installed inside the support cylinder. A feed pipe and a discharge pipe are fixedly installed at the upper and lower ends of the feed cylinder, respectively. A sealing cylinder is fixedly installed in the middle of the inner wall of the support cylinder. A water inlet pipe and a water outlet pipe are installed at the upper and lower ends of the sealing cylinder, respectively. Multiple sets of blades located inside the sealing cylinder are fixedly installed on the outer surface of the feed cylinder. A fan blade is fixedly sleeved on the top of the outer surface of the feed cylinder.

[0008] The bottom of the feed cylinder is provided with multiple sets of connecting rods, and the bottom of the connecting rods is fixedly connected to a stirring rod, and the outer surface of the stirring rod is fixedly connected to a contact plate;

[0009] This redesigned device significantly improves the reaction rate between flocculant and wastewater. To achieve this, the device is equipped with a pressure plate and an air inlet to provide rotational support for the feed cylinder, loading cylinder, and discharge pipe. The discharge pipe is inclinedly connected to the bottom of the feed cylinder. The flocculant is added from the loading cylinder and flows into the discharge pipe under gravity through a channel inside the feed cylinder. To enable the rotation of the feed cylinder and discharge pipe, a sealing cylinder located inside the support cylinder and blades mounted on the outer surface of the feed cylinder are included. The overall design has also been redesigned. The position of the inlet pipe, installed at the top of the sealed cylinder, alters the path of sewage entering the device. After sewage enters the sealed cylinder through the inlet pipe, it is discharged through the drain pipe. By driving the feed cylinder to rotate, the discharge pipe, fan blades, stirring rod, and contact plate also rotate. The rotating discharge pipe can spray the flocculant along a circular path and ensure full contact with the sewage, increasing the contact area between suspended impurities in the sewage and the flocculant. This increases the rate of flocculant formation and significantly accelerates the sedimentation of flocculants in the sewage.

[0010] Then, in order to enable the connecting rod, stirring rod, and contact plate to move in the sewage at a lower rotational speed during stirring, and to reduce the degree of damage to the flocs after stirring, this device adds loads including a discharge pipe, fan blades, feeding cylinder, flocculant inside the feeding cylinder, connecting column, connecting ring, connecting rod, stirring rod, and contact plate to the outer surface of the feed cylinder. These loads counteract the mechanical energy generated by the blades under the action of sewage, thereby effectively slowing down the stirring speed of the stirring rod and contact plate. When the connecting rod and stirring rod move in the sewage, they will come into full contact with the gas in the sewage, thereby promoting the discharge of excess gas in the sewage. At the same time, the fan blades set on the outer surface of the feed cylinder generate an upward negative pressure in the inner cavity of the support cylinder, which sucks away the gas discharged by the contact plate in the sewage, reducing the probability of the flocs being driven by bubbles to generate buoyancy.

[0011] Finally, the feeding cylinder of this device is located at the top of the feed cylinder. When the feed cylinder rotates, the flocculant inside can move vertically downward along the inner wall of the channel. In conjunction with the rotation of the feed cylinder and the discharge pipe, it can effectively prevent the flocculant from clogging in the feed cylinder, feeding cylinder and discharge pipe, thus avoiding the problem of uneven feeding. In addition, the water inlet pipe, sealing cylinder and drain pipe of this device change the path of sewage into the device. At the same time, through the continuous contact between sewage and the blades and the force generated, the gas in the sewage is concentrated together in the sealing cylinder by stirring. After flowing into the sedimentation tank, it is discharged more quickly under the negative pressure generated by the rotation of the blades.

[0012] Preferably, multiple sets of connecting columns are fixedly connected to the bottom of the outer surface of the feed cylinder, and a connecting ring is fixedly connected to one end of the outer side of each set of connecting columns. The connecting rods are configured as four sets and are distributed equidistantly in a circle at the bottom of the connecting ring.

[0013] The connecting column and connecting ring are responsible for connecting and supporting the connecting rod, stirring rod and contact plate, so that when the feed cylinder rotates, it can drive the connecting rod and stirring rod to stir the sewage. The rotating discharge pipe can spray the flocculant along the annular path and make full contact with the sewage, which increases the contact area between the suspended impurities in the sewage and the flocculant, thereby increasing the rate of floc formation and significantly accelerating the sedimentation rate of flocs in the sewage.

[0014] Preferably, the cross-sectional shape of the connecting column is an isosceles triangle, and the stirring rod is located below the sewage surface;

[0015] like Figure 5 As shown, the connecting column with an isosceles triangular cross-section can quickly divert the sewage dripping onto its surface to both sides, preventing any residue from remaining.

[0016] Preferably, a sealing ring is glued to the inner wall of the sealing cylinder, and a seal is formed between the inner wall of the sealing cylinder and the outer surface of the feed cylinder through the sealing ring;

[0017] like Figure 3 As shown, when the feed cylinder rotates, the gap between it and the inner wall of the sealing cylinder needs to be sealed by a sealing ring to ensure that the sewage discharged downward through the sealing cylinder can be smoothly discharged downward along the drain pipe and the outlet, so as not to let the sewage fall onto the outer surface of the feed cylinder.

[0018] Preferably, the sealing cylinder has an inlet and an outlet on the left side of the top and the right side of the bottom, respectively. The inlet and outlet are connected to an inlet pipe and a drain pipe, respectively. The bottom end of the inlet pipe extends to the left and reaches the outside of the support cylinder.

[0019] like Figure 2 , Figure 3 As shown, the inlet and outlet are connected to the inlet pipe and the outlet pipe, respectively. Sewage enters the inner cavity of the sealed cylinder through the inlet pipe and drives the paddle to rotate. Then, it flows down into the sedimentation tank through the outlet and the outlet pipe.

[0020] Preferably, the inside of the feed cylinder is provided with a through groove, the feed cylinder and the discharge pipe are connected through the through groove, and the discharge pipe is inclined;

[0021] The trough allows the flocculant located in the feed cylinder to flow downwards, and the vertically arranged trough can effectively avoid clogging caused by flocculant accumulation. The rotating discharge pipe can spray the flocculant along the annular path and fully contact the wastewater, increasing the contact area between suspended impurities in the wastewater and the flocculant, thereby increasing the rate of flocculant sedimentation.

[0022] Preferably, the drain pipe is connected and installed at the bottom left side of the sedimentation tank, and the overflow pipe is connected and installed at the top right side of the sedimentation tank;

[0023] The flocculent sediment produced by the sewage will eventually settle to the bottom and be discharged through the sewage pipe, while the clear water on the top can be discharged through the overflow pipe.

[0024] Preferably, a support ring located above the fan blade is fixedly installed on the top of the inner wall of the support cylinder, the feed cylinder is rotatably installed inside the support ring, and an annular gap is provided between the top of the support cylinder and the outer surface of the feed cylinder.

[0025] like Figure 2 As shown, the pressure plate is responsible for air intake balance. Inside the support cylinder, the rotating fan blades can generate upward negative pressure, while the annular gap between the top of the support cylinder and the outer surface of the feed cylinder can assist in the gas discharge.

[0026] The beneficial effects of this invention are as follows:

[0027] 1. This device has been redesigned to significantly improve the reaction rate between flocculant and wastewater. To achieve this, the device is equipped with a pressure plate and an air inlet to provide rotational support for the feed cylinder, loading cylinder, and discharge pipe. The discharge pipe is inclinedly connected to the bottom of the feed cylinder. The flocculant is added from the loading cylinder and flows into the discharge pipe under gravity through a channel opened inside the feed cylinder. To enable the rotation of the feed cylinder and discharge pipe, a sealing cylinder located inside the support cylinder and blades installed on the outer surface of the feed cylinder are included. The device has also been redesigned. The position of the inlet pipe was changed so that it was installed at the top of the sealed cylinder, altering the path of sewage entering the device. After the sewage enters the sealed cylinder through the inlet pipe, it is discharged through the drain pipe. By driving the feed cylinder to rotate, the discharge pipe, fan blades, stirring rod, and contact plate are also rotated. The rotating discharge pipe can spray the flocculant along the annular path and fully contact it with the sewage, increasing the contact area between suspended impurities in the sewage and the flocculant, thereby increasing the rate of floc formation and significantly accelerating the sedimentation of flocs in the sewage.

[0028] 2. Then, in order to enable the connecting rod, stirring rod, and contact plate to move in the sewage at a lower rotational speed during stirring, and to reduce the degree of damage to the flocs after stirring, this device adds loads including a discharge pipe, fan blades, feeding cylinder, flocculant inside the feeding cylinder, connecting column, connecting ring, connecting rod, stirring rod, and contact plate to the outer surface of the feed cylinder. These loads counteract the mechanical energy generated by the blades under the action of sewage, thereby effectively slowing down the stirring speed of the stirring rod and contact plate. When the connecting rod and stirring rod move in the sewage, they will come into full contact with the gas in the sewage, thereby promoting the discharge of excess gas in the sewage. At the same time, the fan blades set on the outer surface of the feed cylinder generate an upward negative pressure in the inner cavity of the support cylinder, which sucks away the gas discharged by the contact plate in the sewage, reducing the probability that the flocs will be driven by the bubbles to generate buoyancy.

[0029] 3. Finally, the feeding cylinder of this device is located at the top of the feed cylinder. When the feed cylinder rotates, the flocculant inside can move vertically downward along the inner wall of the channel. In conjunction with the rotation of the feed cylinder and the discharge pipe, it can effectively avoid the flocculant from clogging in the feed cylinder, feeding cylinder and discharge pipe, which would lead to the problem of uneven feeding. In addition, the water inlet pipe, sealing cylinder and drain pipe of this device change the path of sewage into the device. At the same time, through the continuous contact between sewage and the blades and the force generated, the gas in the sewage is concentrated together in the sealing cylinder by stirring. After flowing into the sedimentation tank, it is discharged more quickly under the negative pressure generated by the rotation of the blades. Attached Figure Description

[0030] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles of this application in a clear and understandable manner.

[0031] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0032] Figure 1 This is a front view diagram of the overall structure of the present invention;

[0033] Figure 2 This is a front sectional view of the overall structure of the present invention;

[0034] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A;

[0035] Figure 4 This is a schematic diagram of the structure of the support cylinder, water inlet pipe, support ring, feed cylinder, loading cylinder, connecting column, connecting ring, connecting rod, stirring rod and contact plate of the present invention;

[0036] Figure 5 This is a schematic diagram showing the separation of the connecting column, connecting ring, connecting rod, stirring rod, and contact plate of the present invention;

[0037] Figure 6 This is a schematic diagram showing the separation of the water inlet pipe, support ring, feed cylinder, loading cylinder, sealing cylinder, drain pipe and sealing ring of the present invention;

[0038] Figure 7 This is a top view diagram of the overall structure of the present invention;

[0039] Figure 8 This is a top sectional view of the support cylinder and sealing cylinder of the present invention.

[0040] The components are as follows: 1. Sedimentation tank; 2. Sewage pipe; 3. Overflow pipe; 4. Pressure plate; 5. Air inlet; 6. Support cylinder; 7. Water inlet pipe; 8. Support ring; 9. Feed cylinder; 10. Feeding cylinder; 11. Through groove; 12. Discharge pipe; 13. Fan blade; 14. Sealing cylinder; 15. Drain pipe; 16. Sealing ring; 17. Paddle blade; 18. Connecting column; 19. Connecting ring; 20. Connecting rod; 21. Agitating rod; 22. Contact plate; 23. Water inlet; 24. Water outlet. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0042] Please see Figures 1-8 This embodiment discloses an oil and gas development wastewater treatment device, comprising:

[0043] The sedimentation tank 1 has a sewage pipe 2 and an overflow pipe 3 installed on its left and right sides respectively. A pressure plate 4 is installed on the top of the sedimentation tank 1. Multiple air inlets 5 are opened on the top of the pressure plate 4. The inner cavity of the sedimentation tank 1 is used to hold sewage.

[0044] The support cylinder 6 is fixedly installed inside the pressure plate 4. The feed cylinder 9 is rotatably installed inside the support cylinder 6. The upper and lower ends of the feed cylinder 9 are respectively fixedly installed with the feed cylinder 10 and the discharge pipe 12. The middle of the inner wall of the support cylinder 6 is fixedly installed with the sealing cylinder 14. The upper and lower ends of the sealing cylinder 14 are respectively installed with the water inlet pipe 7 and the drain pipe 15. Multiple sets of paddle blades 17 located inside the sealing cylinder 14 are fixedly installed on the outer surface of the feed cylinder 9. The top of the outer surface of the feed cylinder 9 is fixedly sleeved with the fan blade 13.

[0045] The bottom of the feed cylinder 9 is provided with multiple sets of connecting rods 20, and the bottom of the connecting rods 20 is fixedly connected to a stirring rod 21. The outer surface of the stirring rod 21 is fixedly connected to a contact plate 22.

[0046] This device has been redesigned to significantly improve the reaction rate between flocculant and wastewater. To achieve this, the device is equipped with a pressure plate 4 and an air inlet 5 to provide rotational support for the feed cylinder 9, the loading cylinder 10, and the discharge pipe 12. The discharge pipe 12 is inclinedly connected to the bottom end of the feed cylinder 9. The flocculant is added from the loading cylinder 10 and flows into the discharge pipe 12 under gravity through a through-slot 11 inside the feed cylinder 9. To enable the rotation of the feed cylinder 9 and the discharge pipe 12, the device is equipped with a sealing cylinder 14 located inside the support cylinder 6 and blades 17 mounted on the outer surface of the feed cylinder 9. The position of the inlet pipe 7 is designed so that it is installed on the top of the sealing cylinder 14, which changes the path of sewage entering the device. When the sewage enters the sealing cylinder 14 through the inlet pipe 7, it is discharged through the drain pipe 15. By pushing the feed cylinder 9 to rotate, the discharge pipe 12, the fan blade 13, the stirring rod 21 and the contact plate 22 are driven to rotate. The rotating discharge pipe 12 can spray the flocculant along the annular path and fully contact the sewage, increasing the contact area between the suspended impurities in the sewage and the flocculant, thereby increasing the generation rate of flocculent sedimentation and significantly accelerating the sedimentation rate of flocculent in the sewage.

[0047] Then, in order to enable the connecting rod 20, stirring rod 21 and contact plate 22 to move in the sewage at a lower rotational speed during stirring, and to reduce the degree of damage to the flocs after stirring, the device is equipped with loads including discharge pipe 12, fan blade 13, feeding cylinder 10, flocculant inside feeding cylinder 10, connecting column 18, connecting ring 19, connecting rod 20, stirring rod 21 and contact plate 22 on the outer surface of the feed cylinder 9, to counteract the mechanical energy generated by the blade 17 under the action of sewage, thereby effectively slowing down the stirring speed of stirring rod 21 and contact plate 22. When the connecting rod 20 and stirring rod 21 move in the sewage, they will come into full contact with the gas in the sewage, thereby promoting the discharge of excess gas in the sewage. At the same time, the fan blade 13 set on the outer surface of the feed cylinder 9 generates an upward negative pressure in the inner cavity of the support cylinder 6, which sucks away the gas discharged by the contact plate 22 in the sewage, reducing the probability that the flocs are driven by the bubbles to generate buoyancy.

[0048] Finally, the feeding cylinder 10 of this device is located at the top of the feeding cylinder 9. When the feeding cylinder 9 rotates, the flocculant inside it can move vertically downward along the inner wall of the channel 11. With the rotation of the feeding cylinder 9 and the discharge pipe 12, the flocculant can be effectively prevented from clogging in the feeding cylinder 9, the feeding cylinder 10 and the discharge pipe 12, which would prevent the flocculant from being evenly distributed. In addition, the water inlet pipe 7, the sealing cylinder 14 and the drain pipe 15 of this device change the path of the sewage into the device. At the same time, the sewage continuously contacts the blade 17 and generates force, so that the gas in the sewage is concentrated in the sealing cylinder 14 by stirring. After flowing into the sedimentation tank 1, it is discharged faster under the negative pressure generated by the rotation of the fan blade 13.

[0049] In this embodiment, multiple sets of connecting columns 18 are fixedly connected to the bottom of the outer surface of the feed cylinder 9. Connecting rings 19 and connecting rods 20 are fixedly connected to one end of the outer side of the multiple sets of connecting columns 18. The connecting rods 20 are set into four groups and are distributed equidistantly in a circle at the bottom of the connecting rings 19.

[0050] The connecting column 18 and the connecting ring 19 are responsible for connecting and supporting the connecting rod 20, the stirring rod 21 and the contact plate 22, so that when the feed cylinder 9 rotates, it can drive the connecting rod 20 and the stirring rod 21 to stir the sewage. The rotating discharge pipe 12 can spray the flocculant along the annular path and fully contact the sewage, increasing the contact area between the suspended impurities in the sewage and the flocculant, thereby increasing the rate of floc sedimentation and significantly accelerating the sedimentation rate of flocs in the sewage.

[0051] In this embodiment, the cross-sectional shape of the connecting column 18 is an isosceles triangle, and the stirring rod 21 is located below the sewage surface;

[0052] like Figure 5 As shown, the connecting column 18, with an isosceles triangular cross-section, can quickly divert the sewage dripping onto its surface to both sides, preventing any residue from remaining.

[0053] In this embodiment, a sealing ring 16 is glued to the inner wall of the sealing cylinder 14, and a seal is formed between the inner wall of the sealing cylinder 14 and the outer surface of the feed cylinder 9 through the sealing ring 16.

[0054] like Figure 3 As shown, when the feed cylinder 9 rotates, the gap between it and the inner wall of the sealing cylinder 14 needs to be sealed by the sealing ring 16 to ensure that the sewage discharged downward through the sealing cylinder 14 can be smoothly discharged downward along the drain pipe 15 and the outlet 24, so that the sewage does not fall on the outer surface of the feed cylinder 9.

[0055] In this embodiment, the top left side and bottom right side of the sealing cylinder 14 are respectively provided with a water inlet 23 and a water outlet 24. The water inlet 23 and the water outlet 24 are respectively connected to the water inlet pipe 7 and the water outlet pipe 15. The bottom end of the water inlet pipe 7 extends to the left and reaches the outside of the support cylinder 6.

[0056] like Figure 2 , Figure 3 As shown, the inlet 23 and outlet 24 are connected to the inlet pipe 7 and the drain pipe 15, respectively. The sewage enters the inner cavity of the sealing cylinder 14 through the inlet 23 along the inlet pipe 7 and drives the paddle 17 to rotate. Then, it flows downward through the outlet 24 and the drain pipe 15 into the sedimentation tank 1.

[0057] In this embodiment, a through groove 11 is provided inside the feed cylinder 9, and the feed cylinder 10 and the discharge pipe 12 are connected through the through groove 11. The discharge pipe 12 is inclined.

[0058] The trough 11 allows the flocculant in the feed cylinder 10 to flow downwards, and the vertically arranged trough 11 can effectively avoid the blockage problem caused by the accumulation of flocculant. The rotating discharge pipe 12 can spray the flocculant along the annular path and fully contact the sewage, increasing the contact area between the suspended impurities in the sewage and the flocculant, thereby increasing the rate of flocculant sedimentation.

[0059] In this embodiment, the drain pipe 2 is connected to the bottom of the left side of the sedimentation tank 1, and the overflow pipe 3 is connected to the top of the right side of the sedimentation tank 1.

[0060] The flocculent sediment produced by the sewage will eventually settle to the bottom and be discharged through the sewage pipe 2, while the clear water on the upper layer can be discharged through the overflow pipe 3.

[0061] In this embodiment, a support ring 8 located above the fan blade 13 is fixedly installed on the top of the inner wall of the support cylinder 6, and the feed cylinder 9 is rotatably installed inside the support ring 8. An annular gap is provided between the top of the support cylinder 6 and the outer surface of the feed cylinder 9.

[0062] like Figure 2 As shown, the pressure plate 4 is responsible for air intake balance. In the inner cavity of the support cylinder 6, the rotating fan blade 13 can generate upward negative pressure, while the annular gap between the top of the support cylinder 6 and the outer surface of the feed cylinder 9 can assist in the gas discharge.

[0063] Working principle:

[0064] When this device is working: (e.g.) Figure 2 As shown, wastewater enters the device through the inlet pipe 7 and flows inside the sealed cylinder 14. By applying pressure to the paddle 17, the feed cylinder 9 is rotated. The wastewater then flows directly into the inner cavity of the sedimentation tank 1 along the drain pipe 15. At the same time, flocculant is added to the inside of the feed cylinder 10, so that the flocculant flows out along the channel 11 and the discharge pipe 12. After entering the inner cavity of the sedimentation tank 1, the flocculant will react chemically with the impurities in the wastewater and generate flocculent sediment that settles downward.

[0065] Then, as the wastewater passes through the inner cavity of the sealed cylinder 14, it continuously exerts thrust on the paddle 17, driving the feed cylinder 9, the loading cylinder 10, the discharge pipe 12, and the fan blade 13 to rotate. Figure 2 , Figure 4As shown, the fan blades 13 rotating with the feed cylinder 9 generate an upward negative pressure on the inner wall of the support cylinder 6. At the same time, the inclined discharge pipe 12 sprays the flocculant onto the wastewater surface in a ring path. The feed cylinder 9 drives the connecting column 18, connecting ring 19, connecting rod 20, stirring rod 21 and contact plate 22 to rotate and stir in the wastewater. The rotation speed is low and does not disperse the flocculent material generated in the sedimentation tank 1. The wastewater converts some of its potential energy into the mechanical energy of the blades 17 and the feed cylinder 9 in the sealed cylinder 14. When the feed cylinder 9 rotates, the resistance from the rotation driven by the feed cylinder 9 consumes some of the mechanical energy. The resistance generated by the rotation of the connecting rod 20, stirring rod 21 and contact plate 22 in the wastewater consumes some of the mechanical energy. Therefore, the connecting ring 19, feed cylinder 9 and stirring rod 21 will rotate at a relatively slow speed. As the contact area between the stirring rod 21 and contact plate 22 and the inside of the wastewater increases, the gas in the wastewater will be discharged during its rotation and stirred, and then sucked away by the negative pressure generated in the support cylinder 6.

[0066] Finally, the flocculent material formed settles to the bottom of the sedimentation tank 1, while the clear water at the top overflows through the overflow pipe 3.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A wastewater treatment device for oil and gas development, characterized in that, include: A sedimentation tank (1) is equipped with a drain pipe (2) and an overflow pipe (3) on its left and right sides respectively. A pressure plate (4) is installed on the top of the sedimentation tank (1). Multiple air inlets (5) are opened on the top of the pressure plate (4). The inner cavity of the sedimentation tank (1) is used to hold sewage. A support cylinder (6) is fixedly installed inside the pressure plate (4). A feed cylinder (9) is rotatably installed inside the support cylinder (6). A feed cylinder (10) and a discharge pipe (12) are fixedly installed at the upper and lower ends of the feed cylinder (9). A sealing cylinder (14) is fixedly installed in the middle of the inner wall of the support cylinder (6). A water inlet pipe (7) and a drain pipe (15) are installed at the upper and lower ends of the sealing cylinder (14). Multiple sets of paddle blades (17) located inside the sealing cylinder (14) are fixedly installed on the outer surface of the feed cylinder (9). A fan blade (13) is fixedly sleeved on the top of the outer surface of the feed cylinder (9). The bottom of the feed cylinder (9) is provided with multiple sets of connecting rods (20), and the bottom of the connecting rods (20) is fixedly connected to a stirring rod (21), and the outer surface of the stirring rod (21) is fixedly connected to a contact plate (22).

2. The wastewater treatment device for oil and gas development according to claim 1, characterized in that, Multiple sets of connecting columns (18) are fixedly connected to the bottom of the outer surface of the feed cylinder (9). A connecting ring (19) is fixedly connected to one end of the outer side of the multiple sets of connecting columns (18). The connecting rods (20) are set into four groups and are distributed equidistantly in a circle at the bottom of the connecting ring (19).

3. The wastewater treatment device for oil and gas development according to claim 2, characterized in that, The cross-sectional shape of the connecting column (18) is an isosceles triangle, and the stirring rod (21) is located below the sewage liquid surface.

4. The wastewater treatment device for oil and gas development according to claim 3, characterized in that, The inner wall of the sealing cylinder (14) is glued with a sealing ring (16), and a seal is formed between the inner wall of the sealing cylinder (14) and the outer surface of the feed cylinder (9) through the sealing ring (16).

5. The wastewater treatment device for oil and gas development according to claim 4, characterized in that, The sealing cylinder (14) has an inlet (23) on the left side of the top and an outlet (24) on the right side of the bottom. The inlet (23) and outlet (24) are connected to the inlet pipe (7) and the drain pipe (15) respectively. The bottom end of the inlet pipe (7) extends to the left and reaches the outside of the support cylinder (6).

6. The wastewater treatment device for oil and gas development according to claim 5, characterized in that, The feed cylinder (9) has a through groove (11) inside. The feed cylinder (10) and the discharge pipe (12) are connected through the through groove (11). The discharge pipe (12) is inclined.

7. The oil and gas development wastewater treatment device according to claim 6, characterized in that, The drain pipe (2) is connected to the bottom left side of the sedimentation tank (1), and the overflow pipe (3) is connected to the top right side of the sedimentation tank (1).

8. The wastewater treatment device for oil and gas development according to claim 7, characterized in that, A support ring (8) located above the fan blade (13) is fixedly installed on the top of the inner wall of the support cylinder (6). The feed cylinder (9) is rotatably installed inside the support ring (8). An annular gap is provided between the top of the support cylinder (6) and the outer surface of the feed cylinder (9).

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