Continuous purification treatment device and method for petroleum and natural gas drilling sewage

Abstract

The invention provides a petroleum and natural gas drilling sewage continuous purification treatment device and method, and relates to the technical field of sewage treatment.The petroleum and natural gas drilling sewage continuous purification treatment device comprises a treatment box, a gas dissolving system and a control box, a first partition plate, a second partition plate and a third partition plate are fixed to the inner wall of the treatment box, and the interior of the treatment box is divided into a flocculation bin, an air flotation bin, a separation bin and a floating foam bin; a water inlet pump is arranged outside the treatment box, the water inlet pump is electrically connected with the control box, the water outlet end of the water inlet pump is communicated with the flocculation bin through a water inlet pipe, sewage to be treated is conveyed into the flocculation bin, and a flocculant tank is arranged outside the treatment box. In the treatment box, a filter screen and a cleaning mechanism are arranged on a second partition plate, a rotary releaser corresponding to the position of the cleaning mechanism is installed in an air floatation bin, the rotary releaser can drive the cleaning mechanism to clean the filter screen every time the rotary releaser is started, flocculent impurities can be prevented from blocking the filter screen, shutdown cleaning is not needed, and the cleaning efficiency is improved. The sewage treatment continuity is ensured.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a continuous purification treatment device and method for oil and gas drilling wastewater. Background Technology

[0002] Oil and gas drilling wastewater is generated during various drilling processes and includes drilling waste fluids, flushing wastewater, silt, and oil. This wastewater contains a significant amount of oil and is typically treated by settling in a sedimentation tank, followed by an oil-water separator to separate large oil particles. Further treatment involves flocculation, flotation, and filtration to purify the drilling wastewater. Because some oil undergoes emulsification during drilling, emulsified oil is difficult to separate from water and easily clogs filters. Therefore, flotation is currently a necessary step in the treatment of drilling wastewater.

[0003] Dissolved air flotation (DAF) units are a common type of wastewater treatment equipment. In the treatment of drilling wastewater, due to the complex colloidal chemical components, flocculation is also necessary. Flocculation serves as a pre-treatment step for DAF. After flocculation and sedimentation, the wastewater entering the DAF unit still contains many unprecipitated flocculent impurities. These impurities easily consume a significant amount of dissolved air bubbles, increasing the load on the dissolved air system. Therefore, the wastewater after flocculation treatment needs to undergo simple filtration before being subjected to DAF.

[0004] However, filtering flocculated wastewater is quite troublesome, mainly because the flocculent material easily clogs the filter screen, requiring frequent cleaning. The cleaning process can significantly disturb the sedimentation zone at the bottom of the flocculation chamber, resulting in slow re-sedimentation, long downtime, and disruption to the continuity of wastewater treatment. Therefore, a continuous purification treatment device and method for oil and gas drilling wastewater is proposed to solve these problems. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a continuous purification and treatment device for oil and gas drilling wastewater, comprising a treatment tank, a dissolved air system and a control tank, wherein the inner wall of the treatment tank is fixed with partition 1, partition 2 and partition 3, dividing the interior of the treatment tank into a flocculation chamber, a flotation chamber, a separation chamber and a foam chamber.

[0006] An inlet pump is installed on the outside of the treatment tank. The inlet pump is electrically connected to the control box. The outlet of the inlet pump is connected to the flocculation chamber through the inlet pipe, which transports the sewage to be treated into the flocculation chamber.

[0007] The treatment tank is equipped with a flocculant tank on the outside. The flocculant tank injects flocculant into the inlet pipe through the feed pipe. The flocculant tank is equipped with a feed pump, which is controlled by the control box. The feed pump pumps the flocculant in the flocculant tank into the inlet pipe through the feed pipe to mix with the sewage, so that the sewage undergoes flocculation treatment in the flocculation chamber.

[0008] A water outlet is provided in the lower middle part of the first partition. A filter screen corresponding to the water outlet is fixed on one side of the first partition located in the flocculation chamber. A cleaning mechanism for cleaning the filter screen is installed in the lower middle part of the first partition. A rotary release device corresponding to the position of the cleaning mechanism is installed in the air flotation chamber. The rotary release device can drive the cleaning mechanism to clean the filter screen every time it is started.

[0009] The cleaning mechanism includes a sleeve that is fixed through the partition plate. A rotating rod is rotatably connected inside the sleeve. One end of the rotating rod extends into the interior of the flocculation chamber and is fixed with multiple brush plates corresponding to the filter screen. The other end of the rotating rod extends into the interior of the flotation chamber and is fixed with multiple levers arranged in an equidistant circular array.

[0010] The rotary release device includes a sleeve connected to the outlet end of the dissolved gas system. The sleeve is fixed to a partition plate by a bracket. A rotating cylinder is rotatably fitted onto the outside of the sleeve. Multiple arc-shaped tubes are fixedly connected to the rotating cylinder. The sleeve has multiple through holes, and the inner cavity of the sleeve is connected to the inner cavity of the rotating cylinder through the multiple through holes. A hollow tube is slidably fitted into the inner cavity of the sleeve. A limit ring is fixedly fitted to the top end of the hollow tube, and the limit ring is slidably positioned in the inner cavity of the sleeve to prevent the hollow tube from sliding out of the sleeve.

[0011] The surface of the hollow tube is also fixed with a sliding key strip, which is slidably set in the keyway on the inner wall of the bottom end of the sleeve to prevent the hollow tube from rotating. The bottom end of the hollow tube extends through to the bottom of the sleeve and is fixed with a U-shaped plate. A counterweight is rotatably connected to the middle of the U-shaped plate. A hollow rod is fixed on the side of the counterweight near the cleaning mechanism, and the end of the hollow rod near the lever corresponds to the position of the lever.

[0012] The hollow tube floats in water because its overall density is less than that of water. It can also cause the U-shaped plate, counterweight, and hollow rod to float simultaneously in the water. The counterweight sinks in water because its overall density is greater than that of water. The hollow rod floats in water because its overall density is less than that of water.

[0013] The separation chamber is equipped with a return pipe. The left end of the return pipe passes through the second baffle and extends into the interior of the air flotation chamber. Multiple upward-turning blades are fixed on the outer surface of the rotating cylinder, and the upward-turning blades correspond to the port on the left end of the return pipe.

[0014] Furthermore, an agitator is installed inside the flocculation chamber, and multiple isolation inclined plates are set inside the flocculation chamber, with the multiple isolation inclined plates located between the cleaning mechanism and the agitator.

[0015] Specifically, a skimming mechanism is installed on the top of the processing tank, and the skimming mechanism is correspondingly located on the top of the separation chamber.

[0016] Specifically, the dissolved air system includes a high-pressure dissolved air tank, a high-pressure pump, and an air pump. The high-pressure pump pumps the wastewater in the separation chamber into the high-pressure dissolved air tank, and the air pump pumps high-pressure gas into the high-pressure dissolved air tank to form dissolved air water. The outlet of the high-pressure dissolved air tank is connected to the sleeve through a delivery pipe. An electrically controlled valve is also installed between the delivery pipe and the outlet of the high-pressure dissolved air tank. The high-pressure pump, the air pump, and the electrically controlled valve are all electrically connected to the control box.

[0017] Furthermore, it also includes a water pump and a filter located outside the treatment tank, and a water outlet pipe inside the separation chamber, which is connected to the water inlet of the filter through the water pump.

[0018] Furthermore, the treatment tank is equipped with a drain pipe on its exterior, and the flocculation chamber, flotation chamber, separation chamber, and foam chamber are all connected to the drain pipe via drain valves.

[0019] The present invention also proposes a treatment method for a continuous purification treatment device for oil and gas drilling wastewater, comprising the above-mentioned cleaning mechanism, rotary release device and return pipe.

[0020] Compared with existing technologies, this continuous purification and treatment device for oil and gas drilling wastewater has the following advantages: 1. In the treatment box of the present invention, a filter screen and a cleaning mechanism are provided on the partition plate 2. A rotary release device corresponding to the position of the cleaning mechanism is installed in the air flotation chamber. The rotary release device can drive the cleaning mechanism to clean the filter screen every time it is started, which can prevent flocculent impurities from clogging the filter screen, and eliminate the need to stop the machine for cleaning, thus ensuring the continuity of sewage treatment.

[0021] Second, this invention, through the return pipe set between the separation chamber and the flotation chamber, enables the wastewater in the separation chamber to flow back into the flotation chamber for flotation treatment. In addition, in the rotary release device of this invention, when the dissolved air water is discharged through the arc-shaped pipe, the arc-shaped pipe and the rotating drum can rotate, so that the dissolved air water and the wastewater in the flotation chamber are mixed evenly. At the same time, through the multiple upward-turning blades fixed on the outer surface of the rotating drum, the upward-turning blades and the rotating drum rotate together, which can push the wastewater at the left end of the return pipe upward, accelerate the return speed of the wastewater in the return pipe, and allow the impurities that have not been effectively flotated to undergo flotation treatment again, thereby improving the flotation treatment effect of wastewater and reducing the sedimentation at the bottom of the separation chamber.

[0022] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram from the front-view perspective of the present invention. Figure 1 ; Figure 2 This is a three-dimensional structural diagram from the front-view perspective of the present invention. Figure 2 ; Figure 3 This is a three-dimensional structural diagram of the invention from a rear-view perspective; Figure 4 This is a three-dimensional structural diagram of the processing box in this invention; Figure 5 This is a three-dimensional cross-sectional view of the processing box in this invention; Figure 6 This is a schematic diagram of the front section structure of the processing box in this invention; Figure 7 This is a three-dimensional cross-sectional view of the cleaning mechanism in this invention; Figure 8 For the present invention Figure 7 Local structural diagram; Figure 9 This is a three-dimensional structural diagram of the cleaning mechanism and rotary release device in this invention. Figure 1 ; Figure 10 This is a three-dimensional structural diagram of the cleaning mechanism and rotary release device in this invention. Figure 2 ; Figure 11 This is a schematic diagram of the front section of the rotary release device in this invention; Figure 12 Disassembly of the internal structure of the rotary release device in this invention Figure 1 ; Figure 13 Disassembly of the internal structure of the rotary release device in this invention Figure 2 .

[0024] In the picture: 1. Processing tank; 2. Partition 1; 3. Partition 2; 4. Partition 3; 5. Flocculation chamber; 6. Air flotation chamber; 7. Separation chamber; 8. Foam chamber; 9. Dissolved gas system; 91. High-pressure dissolved gas tank; 92. High-pressure pump; 93. Air pump; 94. Delivery pipe; 95. Electrically controlled valve; 10. Water outlet; 11. Filter screen; 12. Cleaning mechanism; 121. Sleeve; 122. Rotating rod; 123. Brush plate; 124. Lever; 13. Rotary release device; 131. Sleeve; 132. Rotary drum; 133. Arc-shaped tube; 134. Through hole; 135. Hollow tube; 1351. Limiting ring; 1352. Sliding keyway; 136. U-shaped plate; 137. Counterweight; 138. Hollow rod; 139. Upward-flipping blade; 14. Return pipe; 15. Control box; 16. Inlet pump; 17. Inlet pipe; 18. Flocculant tank; 19. Feeding pipe; 20. Agitator; 21. Isolation inclined plate; 22. Foam scraper; 23. Outlet pipe; 24. Outlet pump; 25. Filter; 26. Sewage pipe. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1 to 13 The present invention provides the following implementation scheme: a continuous purification and treatment device for oil and gas drilling wastewater, including a treatment tank 1, a dissolved air system 9 and a control box 15. The inner wall of the treatment tank 1 is fixed with partition 1 2, partition 2 3 and partition 3 4, dividing the interior of the treatment tank 1 into a flocculation chamber 5, an air flotation chamber 6, a separation chamber 7 and a foam chamber 8.

[0027] An inlet pump 16 is installed outside the treatment tank 1. The inlet pump 16 is electrically connected to the control box 15. The outlet of the inlet pump 16 is connected to the flocculation chamber 5 through the inlet pipe 17, transporting the wastewater to be treated into the flocculation chamber 5. A first liquid level sensor is also installed inside the flocculation chamber 5 and is electrically connected to the control box 15. The control box 15 controls the working state of the inlet pump 16 based on the signal from the first liquid level sensor, so that the liquid level in the flocculation chamber 5 is maintained within a set range.

[0028] The treatment tank 1 is equipped with a flocculant tank 18 on its exterior. The flocculant tank 18 pumps flocculant into the inlet pipe 17 through the feed pipe 19. The flocculant tank 18 is equipped with a feed pump, which is controlled by the control box 15. The feed pump pumps the flocculant in the flocculant tank 18 into the inlet pipe 17 through the feed pipe 19. After mixing with the sewage, the sewage undergoes flocculation treatment in the flocculation chamber 5. The flocculent impurities from the flocculation reaction settle to the bottom of the flocculation chamber 5.

[0029] An agitator 20 is installed inside the flocculation chamber 5, and multiple isolation inclined plates 21 are provided inside the flocculation chamber 5, with the multiple isolation inclined plates 21 located between the cleaning mechanism 12 and the agitator 20. The agitator 20 is controlled by the control box 15 and is used to agitate the sewage and coagulant in the flocculation chamber 5, causing the flocculants to settle to the bottom of the flocculation chamber 5. In addition, the multiple isolation inclined plates 21 are used to prevent the agitator 20 from disturbing the bottom of the flocculation chamber 5.

[0030] Please refer to this carefully. Figures 6-9 A water outlet 10 is provided in the lower middle part of the partition 2. A filter screen 11 corresponding to the water outlet 10 is fixed on one side of the partition 2 located in the flocculation chamber 5. After the sewage in the flocculation chamber 5 is simply filtered by the filter screen 11, it enters the interior of the flotation chamber 6 through the water outlet 10. After being treated by flotation in the flotation chamber 6, it flows into the separation chamber 7 from the top of the partition 3.

[0031] A cleaning mechanism 12 for cleaning the filter screen 11 is installed in the lower middle part of the partition 12. A rotary release device 13 corresponding to the position of the cleaning mechanism 12 is installed in the air flotation chamber 6. The rotary release device 13 can drive the cleaning mechanism 12 to clean the filter screen 11 each time it is started.

[0032] The cleaning mechanism 12 includes a sleeve 121 that is fixedly inserted through the partition 2. A rotating rod 122 is rotatably connected inside the sleeve 121. One end of the rotating rod 122 extends into the interior of the flocculation chamber 5 and is fixed with multiple brush plates 123 corresponding to the filter screen 11. The other end of the rotating rod 122 extends into the interior of the flotation chamber 6 and is fixed with multiple equally spaced circularly arranged levers 124. When the rotating rod 122 rotates, it drives the brush plates 123 to rotate, thereby cleaning the flocculent impurities clogging the filter screen 11.

[0033] Please refer to this carefully. Figures 9-13 The rotary release device 13 includes a sleeve 131 that is connected to the liquid outlet end of the dissolved gas system 9. The sleeve 131 is fixed on the partition 2 by a bracket. A rotating cylinder 132 is rotatably sleeved on the outside of the sleeve 131. Multiple arc-shaped tubes 133 are fixedly connected on the rotating cylinder 132. Multiple through holes 134 are opened on the sleeve 131. The inner cavity of the sleeve 131 is connected to the inner cavity of the rotating cylinder 132 through the multiple through holes 134.

[0034] Dissolved air water is supplied to the sleeve 131 through the dissolved air system 9, activating the rotary release device 13. When the dissolved air water is discharged through the through hole 134 and the arc-shaped pipe 133, the arc shape of the pipe allows both the arc-shaped pipe 133 and the rotating drum 132 to rotate, injecting dissolved air water into the flotation chamber 6. Simultaneously, the dissolved air water mixes evenly with the wastewater in the flotation chamber 6. The high-pressure dissolved air water loses pressure in the flotation chamber 6, generating a large number of microbubbles. These microbubbles adhere to impurities in the water, causing them to float to the surface. Then, the wastewater and scum enter the separation chamber 7 through the top of the partition 2 3, slowing the flow rate and allowing the impurities with attached microbubbles to gradually float to the surface, forming scum. It should also be noted that the flow rate of the wastewater in the separation chamber 7 is extremely slow.

[0035] Additionally, please see Figures 4-6The top of the processing tank 1 is provided with a skimming mechanism 22, which is correspondingly located on the top of the separation chamber 7. It is used to skim the foam on the liquid surface in the separation chamber 7 into the foam chamber 8 for storage. The skimming mechanism 22 is implemented using existing technology.

[0036] Please refer to it again. Figures 9-13 A hollow tube 135 is slidably fitted inside the sleeve 131. A limiting ring 1351 is fixedly fitted to the top end of the hollow tube 135, and the limiting ring 1351 is slidably disposed inside the sleeve 131 to prevent the hollow tube 135 from sliding out of the sleeve 131. A sliding key 1352 is also fixed to the surface of the hollow tube 135. The sliding key 1352 is slidably disposed in the keyway on the inner wall of the bottom end of the sleeve 131 to prevent the hollow tube 135 from rotating. The bottom end of the hollow tube 135 extends through to the bottom of the sleeve 131 and is fixed with a U-shaped plate 136. A counterweight 137 is rotatably connected to the middle of the U-shaped plate 136. A hollow rod 138 is fixed to the side of the counterweight 137 near the cleaning mechanism 12, and the end of the hollow rod 138 near the lever 124 corresponds to the position of the lever 124.

[0037] The hollow tube 135 floats in water, and its overall density is less than that of water. It can also drive the U-shaped plate 136, the counterweight 137, and the hollow rod 138 to float in water simultaneously. The counterweight 137 sinks in water, and its overall density is greater than that of water. The hollow rod 138 floats in water, and its overall density is less than that of water.

[0038] In the above scheme, the hollow tube 135 and hollow rod 138 are held in a high position in the water due to the buoyancy of the water, while the hollow rod 138 is in a horizontal position. When the rotary release device 13 is activated, i.e., when dissolved air water is supplied to the sleeve 131 through the dissolved air system 9, it pushes the hollow tube 135 downward. The hollow tube 135 pushes the U-shaped plate 136, the counterweight 137, and the hollow rod 138 downward, causing the hollow rod 138 to push the lever 124 downward, which in turn rotates the rotating rod 122 and the brush plate 123 to clean the filter screen 11. When the dissolved air system 9 stops supplying dissolved air water to the sleeve 131, the hollow tube 135... The buoyancy causes it to slowly rise inside the sleeve 131, which in turn drives the U-shaped plate 136, the counterweight 137, and the hollow rod 138 to move upward. When the end of the hollow rod 138 near the lever 124 comes into contact with the lever 124, the hollow rod 138 will tilt to avoid the lever 124 blocking the hollow rod 138, so that the hollow rod 138 moves up above the lever 124 until the hollow tube 135, the U-shaped plate 136, and the hollow rod 138 return to the high position.

[0039] In summary, each time the rotary release device 13 is activated, the cleaning mechanism 12 is driven to clean the filter screen 11. This prevents flocculent impurities from clogging the filter screen 11, eliminating the need to stop the machine for cleaning and ensuring the continuity of wastewater treatment. Furthermore, because the hollow rod 138 can only push the brush plate 123 to rotate a certain angle (less than 180 degrees), it avoids significant disturbance to the sedimentation zone at the bottom of the flocculation chamber 5.

[0040] like Figure 5 and Figure 6 As shown, the separation chamber 7 is equipped with a return pipe 14. The left end of the return pipe 14 passes through the partition 2 3 and extends into the interior of the flotation chamber 6. Multiple upward-turning blades 139 are fixed on the outer surface of the rotating cylinder 132, and the upward-turning blades 139 correspond to the port at the left end of the return pipe 14. Impurities in the separation chamber 7 that do not undergo effective flotation will slowly settle downwards. The wastewater in the separation chamber 7 will then flow back into the flotation chamber 6 through the return pipe 14 for flotation treatment. During this process, the upward-turning blades 139 and the rotating cylinder 132 rotate together, which can push the wastewater at the port at the left end of the return pipe 14 upwards, accelerating the return speed of the wastewater in the return pipe 14. This allows the impurities that did not undergo effective flotation to undergo flotation treatment again, thereby improving the flotation treatment effect of the wastewater and reducing sedimentation at the bottom of the separation chamber 7.

[0041] Specifically, such as Figure 1 and Figure 2 As shown, the dissolved air system 9 includes a high-pressure dissolved air tank 91, a high-pressure pump 92, and an air pump 93. The high-pressure pump 92 pumps the wastewater in the separation chamber 7 into the high-pressure dissolved air tank 91. The air pump 93 pumps high-pressure gas into the high-pressure dissolved air tank 91, forming dissolved air water inside. The outlet of the high-pressure dissolved air tank 91 is connected to the sleeve 131 via a delivery pipe 94. An electrically controlled valve 95 is also installed between the delivery pipe 94 and the outlet of the high-pressure dissolved air tank 91. The high-pressure pump 92, the air pump 93, and the electrically controlled valve 95 are all electrically connected to the control box 15. The dissolved air system 9 is existing technology, and the sensor components and solenoid valve components required for the dissolved air system 9 can all be implemented based on existing technology.

[0042] As a further option, such as Figure 1 Image~ Figure 3As shown, the system also includes an outlet pump 24 and a filter 25 located outside the treatment tank 1. The outlet pump 24 is electrically connected to the control box 15. An outlet pipe 23 is installed inside the separation chamber 7, and the outlet pipe 23 is connected to the inlet of the filter 25 through the outlet pump 24. The outlet pump 24 sends the wastewater treated by air flotation in the separation chamber 7 into the filter 25 for further filtration. The filter 25 is implemented using existing technology. A second liquid level sensor, electrically connected to the control box 15, is also installed inside the separation chamber 7. The control box 15 controls the operation of the outlet pump 24 based on the signal from the second liquid level sensor, ensuring that the liquid level in the separation chamber 7 is higher than the second partition 3 and lower than the third partition 4.

[0043] As a further option, such as Figure 1 and Figure 2 As shown, a drain pipe 26 is installed on the outside of the treatment tank 1. The flocculation chamber 5, flotation chamber 6, separation chamber 7, and foam chamber 8 are all connected to the drain pipe 26 through drain valves. This is to facilitate the discharge of sediment at the bottom of the flocculation chamber 5, flotation chamber 6, and separation chamber 7, as well as the foam impurities collected in the foam chamber 8.

[0044] The present invention also proposes a treatment method for a continuous purification treatment device for oil and gas drilling wastewater, comprising the above-mentioned treatment tank 1 and the cleaning mechanism 12, rotary release device 13 and return pipe 14 inside the treatment tank 1.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A continuous purification and treatment device for oil and gas drilling wastewater, comprising a treatment tank (1), a dissolved air system (9), and a control box (15), wherein the inner wall of the treatment tank (1) is fixed with a first partition (2), a second partition (3), and a third partition (4), dividing the interior of the treatment tank (1) into a flocculation chamber (5), an air flotation chamber (6), a separation chamber (7), and a foam chamber (8), characterized in that: The lower middle part of the partition (2) is provided with a water outlet (10). A filter screen (11) corresponding to the water outlet (10) is fixed on one side of the partition (2) in the flocculation chamber (5). A cleaning mechanism (12) for cleaning the filter screen (11) is installed in the lower middle part of the partition (2). A rotary release device (13) corresponding to the position of the cleaning mechanism (12) is installed in the air flotation chamber (6). The rotary release device (13) can drive the cleaning mechanism (12) to clean the filter screen (11) every time it is started. The cleaning mechanism (12) includes a sleeve (121) that is fixed through the partition (2). A rotating rod (122) is rotatably connected inside the sleeve (121). One end of the rotating rod (122) extends into the interior of the flocculation chamber (5) and is fixed with multiple brush plates (123) corresponding to the filter screen (11). The other end of the rotating rod (122) extends into the interior of the flotation chamber (6) and is fixed with multiple levers (124) arranged in an equidistant circular array. The rotary release device (13) includes a sleeve (131) connected to the liquid outlet of the dissolved gas system (9). A rotating cylinder (132) is rotatably sleeved on the outside of the sleeve (131). Multiple arc-shaped tubes (133) are fixedly connected to the rotating cylinder (132). Multiple through holes (134) are opened on the sleeve (131). The inner cavity of the sleeve (131) is connected to the inner cavity of the rotating cylinder (132) through the multiple through holes (134). The inner cavity is fitted with a hollow tube (135), the bottom end of the hollow tube (135) extends through to the bottom of the sleeve (131) and is fixed with a U-shaped plate (136), the middle of the U-shaped plate (136) is rotatably connected with a counterweight (137), a hollow rod (138) is fixed on the side of the counterweight (137) near the cleaning mechanism (12), and the end of the hollow rod (138) near the lever (124) corresponds to the position of the lever (124); The hollow tube (135) is in a floating state in water, and it can drive the U-shaped plate (136), the counterweight (137) and the hollow rod (138) to float in water at the same time. The counterweight (137) is in a sinking state in water, and the hollow rod (138) is in a floating state in water. The separation chamber (7) is equipped with a return pipe (14). The left end of the return pipe (14) passes through the partition plate (3) and extends into the air flotation chamber (6). The outer surface of the rotating cylinder (132) is fixed with multiple upward-turning blades (139), and the upward-turning blades (139) correspond to the port at the left end of the return pipe (14).

2. The continuous purification and treatment device for oil and gas drilling wastewater according to claim 1, characterized in that: The dissolved gas system (9) includes a high-pressure dissolved gas tank (91), a high-pressure pump (92), and an air pump (93). The high-pressure pump (92) pumps the sewage in the separation chamber (7) into the high-pressure dissolved gas tank (91). The air pump (93) is used to pump high-pressure gas into the high-pressure dissolved gas tank (91) to form dissolved gas water. The outlet of the high-pressure dissolved gas tank (91) is connected to the sleeve (131) through a delivery pipe (94). An electric control valve (95) is also provided between the delivery pipe (94) and the outlet of the high-pressure dissolved gas tank (91). The high-pressure pump (92), the air pump (93), and the electric control valve (95) are all electrically connected to the control box (15).

3. The continuous purification and treatment device for oil and gas drilling wastewater according to claim 1, characterized in that: The processing tank (1) is equipped with an inlet pump (16) on its exterior. The inlet pump (16) is electrically connected to the control box (15). The outlet of the inlet pump (16) is connected to the flocculation chamber (5) through the inlet pipe (17).

4. The continuous purification and treatment device for oil and gas drilling wastewater according to claim 3, characterized in that: The treatment box (1) is equipped with a flocculant tank (18) on the outside. The flocculant tank (18) pumps flocculant into the water inlet pipe (17) through the feeding pipe (19).

5. The continuous purification and treatment device for oil and gas drilling wastewater according to claim 1, characterized in that: The flocculation chamber (5) is equipped with a stirrer (20) and a plurality of isolation inclined plates (21) are provided in the flocculation chamber (5), and the plurality of isolation inclined plates (21) are located between the cleaning mechanism (12) and the stirrer (20).

6. The continuous purification and treatment device for oil and gas drilling wastewater according to claim 1, characterized in that: The top of the processing box (1) is provided with a skimming mechanism (22), which is correspondingly provided on the top of the separation chamber (7).

7. The continuous purification and treatment device for oil and gas drilling wastewater according to claim 1, characterized in that: It also includes a water pump (24) and a filter (25) located outside the processing tank (1). The separation chamber (7) is equipped with a water outlet pipe (23), which is connected to the water inlet of the filter (25) through the water pump (24).

8. A continuous purification and treatment device for oil and gas drilling wastewater, characterized in that: The treatment box (1) is equipped with a drain pipe (26) on its exterior. The flocculation chamber (5), flotation chamber (6), separation chamber (7) and foam chamber (8) are all connected to the drain pipe (26) through a drain valve.

9. A treatment method for a continuous purification and treatment device for oil and gas drilling wastewater, characterized in that: It includes the processing box (1) as described in claim 1, as well as the cleaning mechanism (12), rotary release (13) and return pipe (14) within the processing box (1).

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