A zero-discharge treatment device for oil well wastewater and its treatment process

Abstract

The invention discloses a zero-discharge treatment device for oil well wastewater, comprising a stable gas outlet mechanism, the stable gas outlet mechanism comprising a first semi-ring pipe column, a second semi-ring pipe column and a connection component arranged between the first semi-ring pipe column and the second semi-ring pipe column, two groups of gas pipes are arranged at the bottom of the dissolved gas delivery pipe branch pipe, and are respectively inserted into the first semi-ring pipe column and the second semi-ring pipe column, a base plate is arranged on the inner wall of one side of the gas pipe, the first semi-ring pipe column and the second semi-ring pipe column are both slidably arranged on the base plate, a plurality of gas outlet holes are arranged at the bottom of the first semi-ring pipe column and the second semi-ring pipe column, two sides of the connection component are respectively connected with the first semi-ring pipe column and the second semi-ring pipe column to make the first semi-ring pipe column and the second semi-ring pipe column move in opposite directions. The invention can stably float bubbles formed by the dissolved gas spraying upward from the bottom of the gas floatation pool by arranging the stable gas outlet mechanism, so that impurities of different heights and sizes are more stably adhered to by the bubbles and brought to the wastewater surface, and stably scraped off by the scraper.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a zero-discharge treatment device for oil well wastewater and a treatment process thereof. Background Art

[0002] Oil is the blood of industry and one of the most important strategic energy sources of a country. In order to make better use of oil resources and improve mining efficiency, oil mining consumes a lot of water resources. Water resources also occupy an extremely important position in the national economy and people's livelihood. It is an indispensable resource for social development and human survival. Therefore, oil field mining will inevitably produce surface oil well wastewater. If these oil well wastewaters that reach the surface are not treated in time, the damage to the ecological environment will be greater, and the subsequent treatment costs will increase exponentially. Therefore, all oil field oil well construction units have put forward corresponding treatment and reuse requirements for oil well wastewater, both from the perspective of economic benefits and environmental protection.

[0003] Existing wastewater treatment technologies include the following methods and steps: discharge water from oil well wastewater stations, electrical flotation treatment, ultraviolet ozone treatment, membrane filtration treatment, effluent reuse, and membrane concentrated water evaporation and desalination discharge.

[0004] The above-mentioned existing solutions have the following problems: the tiny bubbles used in the electrical flotation treatment of wastewater attach to impurities and carry them to the water surface for removal, but the mass of some impurities is too large to be made to rise by bubbles alone, causing the bubbles to remain in the water and unable to float. In addition, the bubbles rise from the bottom of the pool, and their effect of bringing impurities to float will decrease after rising a certain distance. Summary of the invention

[0005] The purpose of the present invention is to provide a zero-discharge treatment device for oil well wastewater to solve the above-mentioned technical problems.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a zero-discharge treatment device for oil well wastewater, comprising an air flotation tank, an air dissolving tank and an air dissolving water pump, wherein a slag discharge tank is arranged on one side of the air flotation tank and a main air dissolving conveying pipe is arranged on the other side, wherein the main air dissolving conveying pipe is provided with a plurality of groups of air dissolving conveying pipe branches along the length direction, and a stable air outlet mechanism is connected to the bottom of each group of air dissolving conveying pipe branches, and the stable air outlet mechanism comprises a first semi-ring pipe string, a second semi-ring pipe string and a connecting component arranged between the first semi-ring pipe string and the second semi-ring pipe string, and two groups of air pipes are arranged at the bottom of the air dissolving conveying pipe branches, respectively. Inserted into the first half-ring pipe column and the second half-ring pipe column, the flotation pool is provided with a substrate on the inner wall of one side of the air pipe, the first half-ring pipe column and the second half-ring pipe column are both slidably arranged on the substrate, the tops of the first half-ring pipe column and the second half-ring pipe column are respectively slidably sleeved on the two groups of air pipes, the first half-ring pipe column and the second half-ring pipe column are provided with cavities inside, the bottoms of the first half-ring pipe column and the second half-ring pipe column are provided with multiple groups of air outlet holes connected with the cavities, the two sides of the connecting component are respectively connected with the first half-ring pipe column and the second half-ring pipe column to enable the first half-ring pipe column and the second half-ring pipe column to move in opposite directions;

[0007] A scraper is provided in the flotation tank at the front side of the stable air outlet mechanism. The scraper includes a transmission belt and a scraper plate arranged on the transmission belt. The scraper plate is connected to a linkage component for driving the first half-ring pipe column to move up and down. The scraper plate slides back and forth on the flotation tank and drives the first half-ring pipe column to move up and down through the linkage component.

[0008] Preferably, the base plate is provided with a first semi-ring hole for the first semi-ring tube column to slide up and down, and a second semi-ring hole for the second semi-ring tube column to slide up and down, the connecting component includes a base rod arranged between the first semi-ring hole and the second semi-ring hole and a connecting gear rotatably arranged in the middle of the base rod, and a rack meshing with the connecting gear is provided between the first semi-ring tube column and the second semi-ring tube column.

[0009] Preferably, the transmission belt is symmetrically arranged on both sides of the flotation tank and a connecting seat is provided on the surface of the transmission belt, connecting shafts fixed to the connecting seat are provided on both sides of the scraper plate in the length direction, and one side of the connecting shaft passes through the side wall of the flotation tank, and the linkage component includes a bearing rotatably arranged on the base plate, and the bearing sleeve is arranged on the first semi-ring pipe column, the diameter of the first semi-ring pipe column is larger than that of the second semi-ring pipe column, and a plurality of groups of first local spiral grooves are axially arranged on the outer wall of the first semi-ring pipe column, and guide shafts that form a sliding connection with the first local spiral grooves are symmetrically provided on both sides of the inner ring of the bearing, and the linkage component also includes a linkage part that drives the bearing to rotate.

[0010] Preferably, the linkage comprises a first wire wheel and a second wire wheel, the first wire wheel is rotatably arranged on one side of the base plate, the base plate is provided with a bearing groove for rotatably connecting the bearing, the circumferential outer wall of the bearing is provided with a first tooth portion, the top of the first wire wheel is provided with a second tooth portion, the first tooth portion passes through the bearing groove and is meshed with the second tooth portion, the second wire wheel is fixed on the outer wall of the flotation tank, a first connecting rope is connected between the first wire wheel and the second wire wheel, the second wire wheel is rotatably arranged on the outer wall of the flotation tank and is connected to the connecting shaft by a second connecting rope, and a long rod is fixedly connected between the multiple groups of first semi-ring pipe columns in the flotation tank.

[0011] Preferably, a first torsion spring is connected between the bearing and the base plate.

[0012] Preferably, an air jet groove is provided on the side of the base plate close to the scraper, an air cavity connected to the air jet groove is provided in the base plate, a sealing plate is provided in the air cavity for sliding up and down, a side plate that fits with the inner wall of the air cavity is provided on the side of the sealing plate close to the air jet groove, a docking groove is provided on the side plate, a stop block is provided at the bottom of the sealing plate, a stop rod that abuts against the stop block is provided at the bottom ends of the first semi-ring pipe column and the second semi-ring pipe column, and a return spring is provided on the top of the sealing plate.

[0013] Preferably, a switch sleeve is rotatably provided at the bottom of the air pipe, a lower partition is provided in the hollow interior of the switch sleeve, the lower partition closes part of the opening in the hollow interior of the switch sleeve, and the upper partition closes part of the opening on the inner wall of the air pipe, a lower partition is provided at the bottom of the air pipe, and a driving part for driving the switch sleeve to rotate is provided on the first semi-ring pipe column and the second semi-ring pipe column.

[0014] Preferably, a second partial spiral groove is provided on the outer wall of the switch sleeve, and the driving member includes an abutment rod arranged inside the cavity of the first semi-ring tube column and the second semi-ring tube column. The inner walls of the cavities of the first semi-ring tube column and the second semi-ring tube column are provided with rod grooves for the abutment rod to slide horizontally. A tension spring for driving the abutment rod to slide outward is provided in the rod groove. A slope is provided on the top of the abutment rod. Two groups of driving members are provided in the cavity. When the first semi-ring tube column or the second semi-ring tube column moves upward, the upper group of abutment rods abuts against the second spiral groove to drive the switch sleeve to rotate. After the switch sleeve rotates, the dissolved gas in the trachea enters the cavity. When the first semi-ring tube column or the second semi-ring tube column moves downward, the lower group of abutment rods abuts against the second spiral groove to drive the switch sleeve to rotate in the opposite direction. After the switch sleeve rotates in the opposite direction, the dissolved gas in the trachea cannot enter the cavity.

[0015] Preferably, a cleaning plate for cleaning the surface of the scraper plate is provided above the flotation tank, the cleaning plate is rotatably arranged on the inner wall of the flotation tank, a second torsion spring is connected to the rotating connection between the cleaning rod and the flotation tank, and impurities on the surface of the scraper plate after passing through the cleaning plate are scraped off once, a guide groove is provided on the inner wall of the cleaning plate, a guide pipe is provided on the outer wall of the flotation tank, one end of the guide pipe is connected to the guide groove, and the other end is connected to the slag discharge tank, a flushing connecting pipe is provided on one side of the cleaning plate, and the bottom end of the cleaning connecting pipe is connected to the guide groove.

[0016] A zero-discharge treatment process for oil well wastewater comprises the following steps:

[0017] Step 1: Process the oil well wastewater through a screen to remove large particles of impurities;

[0018] Step 2: The filtered wastewater is discharged into the flotation tank. The first half-ring pipe column and the second half-ring pipe column are driven to move up and down reciprocatingly by a stable gas outlet mechanism in the flotation tank and output dissolved gas, and bubbles are continuously generated to gradually bring impurities in the wastewater to the surface of the wastewater, and the surface impurities are scraped to the slag discharge tank by a scraper;

[0019] Step 3: discharge the wastewater from the flotation tank to the UV ozone reactor to decompose the organic matter in the oil well wastewater into CO2 and H2O;

[0020] Step 4: Passing the treated water through a membrane filtration treatment device to reduce the salt content in the oil well wastewater;

[0021] Step 5: Pass the treated water into the membrane concentrated water evaporation and desalination device for desalination, and finally recycle the water.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The flotation tank is located on one side of the main dissolved air delivery pipe, and the first half-ring pipe column and the second half-ring pipe column are slid up and down. The flotation tank can gradually rise while sending air from the bottom air outlet to the flotation tank, ensuring that the bubbles generated by the output dissolved air have stable buoyancy, and can stably bring impurities of different heights to the surface of the wastewater;

[0024] The first half-ring pipe column and the second half-ring pipe column move in opposite directions through the connection assembly, a switch sleeve is rotated at the bottom of the air pipe, a lower baffle is provided in the hollow interior of the switch sleeve, the lower baffle closes part of the opening in the hollow interior of the switch sleeve, and the upper baffle closes part of the opening on the inner wall of the air pipe, and a lower baffle is provided at the bottom of the air pipe, so that the first half-ring pipe column or the second half-ring pipe column can output dissolved gas when rising, and does not output dissolved gas when descending, so as to avoid the mutual influence between the first half-ring pipe column and the second half-ring pipe column during the rising and descending, thereby causing unstable air flotation, and ensure that the first half-ring pipe column and the second half-ring pipe column can cyclically output dissolved gas during the rising process;

[0025] A cleaning plate is rotatably arranged in the flotation tank, and the scraper plate can clean each time it passes and discharge impurities into the slag discharge tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention highlighting one side of the flotation tank;

[0028] Figure 2 It is a schematic diagram of the overall structure of the present invention highlighting the other side of the flotation tank;

[0029] Figure 3 It is an exploded schematic diagram of the overall structure of the stable gas outlet mechanism of the present invention;

[0030] Figure 4 It is a structural schematic diagram of the present invention highlighting the position of the abutment block;

[0031] Figure 5 is an exploded schematic diagram of the present invention highlighting the bearing, the first guide wheel and the first torsion spring;

[0032] Figure 6 is an exploded schematic diagram of the present invention highlighting the sealing plate and the air cavity;

[0033] Figure 7 is an exploded schematic diagram highlighting the switch cover of the present invention;

[0034] Figure 8 The present invention is a cross-sectional view showing the abutment rod inside the cavity;

[0035] Fig. 9 It is a cross-sectional schematic diagram highlighting the interior of the cleaning plate of the present invention.

[0036] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0037] 1. flotation tank; 2. dissolved air tank; 3. dissolved air pump; 4. slag discharge tank; 5. main dissolved air delivery pipe; 6. branch pipe of dissolved air delivery pipe; 7. stable gas outlet mechanism; 71. first semi-ring pipe column; 72. second semi-ring pipe column; 73. connection assembly; 731. base rod; 732. connection gear; 8. base plate; 9. first semi-ring hole; 10. second semi-ring hole; 11. rack; 12. groove; 13. cavity; 14. gas outlet; 15. first semi-circular disk; 16. second semi-circular disk; 17. scraper; 171. transmission belt; 172. scraper plate; 173. toothed disk; 174. motor; 181. bearing; 182. linkage; 1821. first guide wheel; 1822. first connecting rope; 182 3. Second connecting rope; 1824. Second guide wheel; 19. Connecting seat; 20. Connecting shaft; 21. First partial spiral groove; 22. Guide shaft; 23. Flat-end area; 24. Bearing groove; 25. First tooth portion; 26. Second tooth portion; 27. Long rod; 28. First torsion spring; 29. ​​Fixed block; 30. Groove body; 31. Jet groove; 32. Air cavity; 33. Sealing plate; 34. Abutment block; 35. Abutment rod; 36. Side plate; 37. Docking groove; 38. Return spring; 39. Switch sleeve; 40. Lower partition; 41. Second partial spiral groove; 42. Abutment rod; 43. Rod groove; 44. Tension spring; 45. Inclined surface; 46. Cleaning plate; 47. Guide groove; 48. Guide pipe; 50. Air pipe. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 technicians in this field without creative work are within the scope of protection of the present invention.

[0039] See also Figure 1-9 , the present invention provides a technical solution:

[0040] See also Figure 2 , 3A zero-discharge treatment device for oil well wastewater comprises an air flotation tank 1, an air dissolving tank 2 and an air dissolving water pump 3. A slag discharge tank 4 is arranged on one side of the air flotation tank 1 and a main air dissolving conveying pipe 5 is arranged on the other side. The main air dissolving conveying pipe 5 is provided with a plurality of groups of air dissolving conveying pipe branches 6 along the length direction. A stable air outlet mechanism 7 is connected to the bottom of each group of air dissolving conveying pipe branches 6. The stable air outlet mechanism 7 comprises a first semi-ring pipe column 71, a second semi-ring pipe column 72 and a connecting component 73 arranged between the first semi-ring pipe column 71 and the second semi-ring pipe column 72. Two groups of air pipes 50 are arranged at the bottom of the air dissolving conveying pipe branches 6, which are respectively inserted into the first semi-ring pipe column 71 and the second semi-ring pipe column 72. In the air flotation pool 1, a base plate 8 is provided on the inner wall of one side of the air pipe 50. The base plate 8 is provided with a first semi-ring hole 9 for the first semi-ring pipe column 71 to slide up and down and a second semi-ring hole 10 for the second semi-ring pipe column 72 to slide up and down. The connecting component 73 includes a base rod 731 arranged between the first semi-ring hole 9 and the second semi-ring hole 10 and a connecting gear 732 rotatably arranged in the middle of the base rod 731. A rack 11 meshing with the connecting gear 732 is provided between the first semi-ring pipe column 71 and the second semi-ring pipe column 72. When the first semi-ring pipe column 71 moves upward or downward, the second semi-ring pipe column 72 will move in the opposite direction. The cross section of the first half-ring pipe column 71 is semicircular, and a groove 12 is provided on one end surface of the first half-ring pipe column 71 close to the second half-ring pipe column 72. The rack 11 on the first half-ring pipe column 71 is provided in the groove 12. The groove 12 is provided so that there is an escape space for meshing between the connecting gear 732 and the rack 11, and the first half-ring pipe column 71 will not be interfered by the base rod 731 when it moves up and down; the cross section of the second half-ring pipe column 72 is smaller than the semicircular shape, and will not be interfered by the base rod 731 when it slides up and down. The top ends of the first half-ring pipe column 71 and the second half-ring pipe column 72 are respectively slidably sleeved on the two groups of air pipes 50, wherein the first half A sealing ring may be provided on the inner wall of the top of the annular tube column 71 and the second semi-annular tube column 72, which are sleeved and connected to the air pipe 50. A cavity 13 is provided inside the first semi-annular tube column 71 and the second semi-annular tube column 72. The bottom of the first semi-annular tube column 71 and the second semi-annular tube column 72 are both provided with a plurality of groups of air outlets 14 connected to the cavity 13. In order to make the air holes stably go out upward, a first semi-circular disk 15 is provided at the bottom of the first semi-annular tube column 71, and a second semi-circular disk 16 is provided at the bottom of the second semi-annular tube column 72. The air outlets 14 are connected to the cavity 13 in the form of an L-shaped channel in the first semi-circular disk 15 and the second semi-circular disk 16, so that the dissolved gas is sprayed into the wastewater in an upward spraying manner.

[0041] See also Figure 2 , 3A scraper 17 is provided in the flotation tank 1 at the front side of the stable air outlet mechanism 7. The scraper 17 includes a transmission belt 171 and a scraper plate 172 arranged on the transmission belt 171. The scraper plate 172 is connected with a linkage component for driving the first semi-ring pipe column 71 to move up and down. The scraper plate 172 slides back and forth on the flotation tank 1 and drives the first semi-ring pipe column 71 to move up and down through the linkage component. The movement of the scraper plate 172 drives the first semi-ring pipe column 71 to move, so that when the first semi-ring pipe column 71 moves from the bottom to the top, a set of scrapers The slag plates 172 just move to the position on the wastewater surface closest to the first half-ring pipe column 71 for scraping, and when the second half-ring pipe column 72 moves from the lowermost end to the uppermost position, another set of scraping plates 172 just move to the position on the wastewater surface closest to the first half-ring pipe column 71 for scraping, to ensure that the scraping plates 172 just start scraping after the bubbles drive the impurities in the wastewater to rise a stroke (in this embodiment, there are two sets of scraping plates 172 on the scraper 17, which are just used in conjunction with the first half-ring pipe column 71 and the second half-ring pipe column 72).

[0042] See also Figure 2 , 3 Specifically, the transmission belt 171 is symmetrically arranged on both sides of the flotation tank 1 and a connecting seat 19 is provided on the surface of the transmission belt 171, wherein the transmission belts 171 on both sides are driven to rotate by a toothed disc 173, and a motor 174 for driving the toothed disc 173 to rotate is provided on the outside of the flotation tank 1, and a connecting shaft 20 fixed to the connecting seat 19 is provided on both sides of the scraper plate 172 in the length direction, and one side of the connecting shaft 20 passes through the side wall of the flotation tank 1, and the linkage component includes a bearing 181 rotatably arranged on the base plate 8, and the bearing 181 is sleeved on the first semi-ring pipe column 71, and the diameter of the first semi-ring pipe column 71 is larger than that of the second semi-ring pipe column 72. A plurality of first partial spiral grooves 21 are provided on the outer wall of the first semi-ring pipe column 71 along the axial direction, and a plurality of first partial spiral grooves 21 are provided symmetrically on both sides of the inner ring of the bearing 181. There is a guide shaft 22 that forms a sliding connection with the first partial spiral groove 21, wherein the depth dimension of the first partial spiral groove 21 is smaller than the radius dimension of the first semi-ring tube column 71 and larger than the radius dimension of the second semi-ring tube column 72. When the bearing 181 rotates, the cooperation between the guide shaft 22 and the first partial spiral groove 21 will not be interfered by the second semi-ring tube column 72. The top opening position of one group of first partial spiral grooves 21 is located at the same height position as the bottom opening of the previous group of first partial spiral grooves 21, so that after one group of guide shafts 22 enters one group of first partial spiral grooves 21, another group of guide shafts 22 comes out from another group of first partial spiral grooves 21. Flat-end areas 23 can be set at the inlet and outlet positions of the first partial spiral grooves 21 to provide the guide shafts 22 with a space for connection and alternation.

[0043] See also Figure 1 , 2, 3, 5, the linkage assembly also includes a linkage member 182 for driving the bearing 181 to rotate, the linkage member 182 includes a first wire wheel 1821 and a second wire wheel 1824, the first wire wheel 1821 is rotatably arranged on one side of the base plate 8, the base plate 8 is provided with a bearing groove 24 for the bearing 181 to be rotatably connected, the circumferential outer wall of the bearing 181 is provided with a first tooth portion 25, the top of the first wire wheel 1821 is provided with a second tooth portion 26, the first tooth portion 25 passes through the bearing groove 24 and is meshed with the second tooth portion 26, the second wire wheel 1824 is fixed on the outer wall of the flotation tank 1, the first wire wheel 1821 and the second wire wheel 1824 are fixed on the outer wall of the flotation tank 1, and the first wire wheel 1821 and the second wire wheel 1824 are fixed on the outer wall of the flotation tank 1. The first connecting rope 1822 is connected between the second guide wheel 1824 and the second guide wheel 1824. The second guide wheel 1824 is rotatably arranged on the outer wall of the flotation tank 1 and is connected to the connecting shaft 20 by a second connecting rope 1823. When the scraper plate 172 moves through the transmission belt 171, the connecting shaft 20 will pull the second connecting rope 1823, and the second connecting rope 1823 will drive the second guide wheel 1824 to rotate and pull the first connecting rope 1822, thereby driving the first guide wheel 1821 to rotate. The rotation of the first guide wheel 1821 will drive the bearing 181 to rotate through the meshing connection of the first tooth portion 25 and the second tooth portion 26. The bearing 1 The first half-ring pipe string 71 is driven to move upward or downward through the cooperation of the guide shaft 22 and the first partial spiral groove 21, and the second half-ring pipe string 72 is connected to the first half-ring pipe string 71 through the gear 732 to form a reverse movement. In order to drive the other first half-ring pipe strings 71 and the second half-ring pipe strings 72 to move accordingly, a long rod 27 is fixedly connected between the multiple groups of first half-ring pipe strings 71 in the flotation tank 1, so that all the first half-ring pipe strings 71 and the second half-ring pipe strings 72 can move up and down together. Among them, a first torsion spring 28 is connected between the bearing 181 and the base plate 8, and a first torsion spring 28 is connected between the bearing 181 and the base plate 8. When the second connecting rope 1823 is moved and pulled, the bearing 181 rotates to deform the first torsion spring 28. When the scraper plate 172 moves toward the side close to the base plate 8, the bearing 181 will be reversed under the action of the first torsion spring 28. It should be noted that: since the connecting shaft 20 moves with the scraper plate 172, a runway-shaped trough 30 will be formed on the outer wall of the flotation tank 1. In order to avoid the flotation tank 1 located on the inner side of the transmission belt 171 from being suspended in the air, a fixing block 29 is provided inside the flotation tank 1 to fix the pool wall of the flotation tank 1 located inside the transmission belt 171 and the pool wall of the flotation tank 1 located outside the transmission belt 171.

[0044] See also Figure 2 , 3, 5, 6, a gas injection groove 31 is provided on the side of the base plate 8 close to the scraper 17, an air cavity 32 connected to the gas injection groove 31 is provided in the base plate 8, a sealing plate 33 is provided in the air cavity 32 for sliding up and down, a side plate 36 is provided on the side of the sealing plate 33 close to the gas injection groove 31 to fit the inner wall of the air cavity 32, a docking groove 37 is provided on the side plate 36, a stop block 34 is provided at the bottom of the sealing plate 33, a stop rod 35 abutting against the stop block 34 is provided at the bottom ends of the first semi-ring pipe column 71 and the second semi-ring pipe column 72, a return spring 38 is provided at the top of the sealing plate 33, and a return spring 38 is provided at the first semi-ring pipe column 71 or the second semi-ring pipe column 7 During the rising process, the stopper 34 is pushed upward by the stopper rod 35, so that the sealing plate 33 moves upward and compresses the space in the air cavity 32. When the docking groove 37 is opposite to the air injection groove 31, the gas is released toward the outside of the air injection groove 31, and the impurities floating on the wastewater are blown toward the side of the scraper plate 172, so that the scraper plate 172 can scrape them away. After the stopper rod 35 is separated from the stopper block 34, the sealing plate 33 is returned to the initial position under the action of the return spring 38. The sliding connection between the stopper block 34 and the base plate 8 can be set to a clearance fit to avoid pressure generated when the sealing plate 33 returns to the initial position.

[0045] See also Figure 3 , 7 8. In order to ensure that the first semi-ring pipe column 71 sprays dissolved gas and generates bubbles stably during its ascent, or that the second semi-ring pipe column 72 sprays dissolved gas and generates bubbles stably during its ascent, so that the first semi-ring pipe column 71 or the second semi-ring pipe column 72 that moves downward does not spray dissolved gas, a switch sleeve 39 is rotatably provided at the bottom of the first air pipe 50, a lower baffle 40 is provided in the hollow interior of the switch sleeve 39, the lower baffle 40 closes a part of the opening of the hollow interior of the switch sleeve 39, an upper baffle (not shown) closes a part of the opening of the inner wall of the air pipe 50, a lower baffle 40 is provided at the bottom of the air pipe 50, and a driving member for driving the switch sleeve 39 to rotate is provided on both the first semi-ring pipe column 71 and the second semi-ring pipe column 72.

[0046] See also Figure 2 , 3, 7, 8, a second partial spiral groove 41 is provided on the outer wall of the switch sleeve 39, the driving member includes an abutting rod 42 arranged inside the cavity 13 of the first semi-ring tube column 71 and the second semi-ring tube column 72, a tension spring 44 is provided in the rod groove 43 for driving the abutting rod 42 to slide outward, an inclined surface 45 is provided on the top of the abutting rod 42, and a rod groove 43 for the abutting rod 42 to slide horizontally is provided on the inner wall of the cavity 13 of the first semi-ring tube column 71 and the second semi-ring tube column 72. The driving member is provided with two groups up and down in the cavity 13, the first semi-ring tube column 71 or the second semi-ring tube column 72 When the annular tube column 72 moves upward, the upper group of abutting rods 42 abut against the second spiral groove to drive the switch sleeve 39 to rotate at an angle, so that the lower partition 40 is opposite to the upper partition, ensuring smooth air outlet of the trachea 50 and allowing the dissolved gas in the trachea 50 to enter the cavity 13. When the first half-annular tube column 71 or the second half-annular tube column 72 moves downward, the lower group of abutting rods 42 abut against the second spiral groove to drive the switch sleeve 39 to rotate in the opposite direction. After the switch sleeve 39 rotates in the opposite direction at an angle, the lower partition 40 is staggered with the upper partition, so that the dissolved gas in the trachea 50 cannot enter the cavity 13.

[0047] See also Figure 1 , 2 9. In order to clean the scraper plate 172 when it removes impurities and is located above the transmission belt 171, a cleaning plate 46 for cleaning the surface of the scraper plate 172 is provided above the flotation tank 1. The cleaning plate 46 is rotatably arranged on the inner wall of the flotation tank 1. A second torsion spring (not shown in the figure) is connected to the rotation connection between the cleaning rod and the flotation tank 1. Impurities on the surface of the scraper plate 172 after passing through the cleaning plate 46 are scraped off. A guide groove 47 is provided on the inner wall of the cleaning plate 46. A guide pipe 48 is provided on the outer wall of the flotation tank 1. One end of the guide pipe 48 is connected to the guide groove 47 and the other end is connected to the slag discharge tank 4. A flushing pipe is provided on one side of the cleaning plate 46. The bottom end of the flushing pipe is connected to the guide groove 47, wherein the guide groove 47 can be inclined toward one side of the guide pipe 48 to facilitate impurities to enter the slag discharge tank 4 with waste water. In addition, when the guide groove 47 needs to be cleaned after being used for a period of time, the flushing pipe can be connected to an external water source through a connecting pipe, and clean water is introduced to achieve cleaning.

[0048] See also Figure 1-9As shown, when the device is in use, after the oil well wastewater is introduced into the flotation tank 1, the dissolved air pump 3 extracts the dissolved air in the dissolved air tank 2 and pumps it into the air pipe 50. At this time, the first semi-ring pipe column 71 starts to move upward from the lowest point, and the motor 174 is started at the same time. The motor 174 drives the transmission belt 171 to move, thereby driving the scraper plate 172 to move. The connecting shaft 20 of the scraper plate 172 drives the second wire wheel 1824 to rotate through the second connecting rope 1823, and drives the first wire wheel 1821 to rotate through the first connecting rope 1822. The rotation of the first wire wheel 1821 will drive the bearing 1824 to rotate through the meshing of the first tooth portion 25 and the second tooth portion 26. 1 rotates, the bearing 181 rotates to drive the first half-ring pipe column 71 to move upward through the cooperation between the guide shaft 22 and the first partial spiral groove 21. When the first half-ring pipe column 71 moves upward, it drives the second half-ring pipe column 72 to move downward through the cooperation with the connecting gear 732. The first half-ring pipe column 71 that moves upward drives the switch sleeve 39 to rotate an angle to achieve ventilation through the cooperation between the abutting rod 42 on the upper side of the first half-ring pipe column 71 and the second partial spiral groove 41. The second half-ring pipe column 72 that moves downward drives the switch sleeve 39 to reverse an angle to achieve gas blocking through the abutting rod 42 on the lower side of the second half-ring pipe column 72, so that the dissolved gas can only enter the first half-ring pipe column 71.

[0049] During the rising process of the first semi-circular column 71, the dissolved gas is output from the first semi-circular disk 15 through the air outlet 14 and generates bubbles, which adhere the impurities in the wastewater to the bubbles and gradually float the bubbles until the first semi-circular column 71 rises to the highest position. At this time, the stop block 34 is pushed up by the stop rod 35 on the first semi-circular disk 15, so that the sealing plate 33 moves up to the position where the docking groove 37 is opposite to the air injection groove 31. At this time, the compressed air will be ejected outward to flush the impurities on the surface of the wastewater to the side of the scraper plate 172. At this time, one group of scraper plates 172 just begins to move toward the side away from the substrate 8 and moves toward the side of the slag discharge pool 4, and the other group is connected to the first semi-circular column 71. The scraper plate 172 of the second connecting rope 1823 will move toward the side close to the base plate 8. Under the action of the first torsion spring 28, the bearing 181 will reverse, thereby causing the first semi-ring pipe column 71 to move downward. At this time, the second semi-ring pipe column 72 moves upward and drives the switch sleeve 39 to rotate an angle through the upper abutment rod 42 to achieve ventilation, while the first semi-ring pipe column 71 drives the switch sleeve 39 to reverse and close the ventilation through the lower abutment rod 42, thereby achieving the creation of bubbles again and adhering impurities to rise. The above-mentioned method of the first semi-ring pipe column 71 and the second semi-ring pipe column 72 realizes the generation of circulating bubbles and allows the bubbles to stably drive the impurities to float to the surface of the wastewater.

[0050] After the scraper plate 172 has collected all the impurities, it will pass through the cleaning plate 46 on the top. The cleaning plate 46 will abut against the scraper plate 172 and rotate to scrape off the impurities on the surface of the scraper plate 172. After the scraper plate 172 passes through the cleaning plate 46, the cleaning plate 46 will return to its initial position under the action of the second torsion spring, and the scraped impurities will flow into the slag discharge pool 4 through the guide groove 47 and the guide pipe 48. When the guide groove 47 needs to be cleaned, it can be connected to the flushing pipe through an external connecting pipe, and the external water source can be pumped in for flushing.

[0051] A zero-discharge treatment process for oil well wastewater comprises the following steps:

[0052] Step 1: Process the oil well wastewater through a screen to remove large particles of impurities;

[0053] Step 2: The filtered wastewater is discharged into the flotation tank 1. The first half-ring pipe column 71 and the second half-ring pipe column 72 are driven by the stable gas outlet mechanism 7 in the flotation tank 1 to move up and down and output dissolved gas, and bubbles are continuously generated to gradually bring impurities in the wastewater to the surface of the wastewater, and the surface impurities are scraped to the slag discharge tank 4 by the scraper 17;

[0054] Step 3: discharge the wastewater from the flotation tank 1 to the ultraviolet ozone reactor to decompose the organic matter in the oil well wastewater into CO2 and H2O;

[0055] Step 4: Passing the treated water through a membrane filtration treatment device to reduce the salt content in the oil well wastewater;

[0056] Step 5: Pass the treated water into the membrane concentrated water evaporation and desalination device for desalination, and finally recycle the water.

[0057] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0058] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0059] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A zero-discharge treatment device for oil well wastewater, comprising an air flotation tank, an air dissolving tank and an air dissolving water pump, characterized in that: A slag discharge pool is provided on one side of the flotation pool, and a main dissolved air delivery pipe is provided on the other side. The main dissolved air delivery pipe is provided with a plurality of dissolved air delivery pipe branches along the length direction. The bottom of each dissolved air delivery pipe branch is connected with a stable gas outlet mechanism. The stable gas outlet mechanism includes a first semi-ring pipe column, a second semi-ring pipe column, and a connecting component arranged between the first semi-ring pipe column and the second semi-ring pipe column. Two groups of air pipes are arranged at the bottom of the dissolved air delivery pipe branch, which are respectively inserted into the first semi-ring pipe column and the second semi-ring pipe column. The flotation pool is located at the gas flotation pool. A base plate is provided on the inner wall of one side of the tube, the first half-ring tube column and the second half-ring tube column are both slidably arranged on the base plate, the tops of the first half-ring tube column and the second half-ring tube column are respectively slidably sleeved on the two groups of air pipes, the first half-ring tube column and the second half-ring tube column are provided with cavities inside, the bottoms of the first half-ring tube column and the second half-ring tube column are both provided with multiple groups of air outlet holes connected with the cavities, and the two sides of the connecting component are respectively connected with the first half-ring tube column and the second half-ring tube column to enable the first half-ring tube column and the second half-ring tube column to move in opposite directions; A scraper is provided in the flotation tank at the front side of the stable air outlet mechanism, the scraper includes a transmission belt and a scraper plate arranged on the transmission belt, the scraper plate is connected to a linkage assembly for driving the first half-ring pipe column to move up and down, the scraper plate slides back and forth on the flotation tank and drives the first half-ring pipe column to move up and down through the linkage assembly; The base plate is provided with a first semi-ring hole for the first semi-ring pipe column to slide up and down, and a second semi-ring hole for the second semi-ring pipe column to slide up and down, the connection assembly includes a base rod arranged between the first semi-ring hole and the second semi-ring hole, and a connection gear rotatably arranged in the middle of the base rod, and a rack meshing with the connection gear is arranged between the first semi-ring pipe column and the second semi-ring pipe column; The transmission belt is symmetrically arranged on both sides of the flotation tank and a connecting seat is provided on the surface of the transmission belt. Connecting shafts fixed to the connecting seat are provided on both sides of the scraper plate in the length direction. One side of the connecting shaft passes through the side wall of the flotation tank. The linkage component includes a bearing rotatably arranged on the base plate, and the bearing sleeve is arranged on the first semi-ring pipe column. The diameter of the first semi-ring pipe column is larger than that of the second semi-ring pipe column. A plurality of groups of first partial spiral grooves are axially arranged on the outer wall of the first semi-ring pipe column. Guide shafts that form a sliding connection with the first partial spiral grooves are symmetrically arranged on both sides of the inner ring of the bearing. The linkage component also includes a linkage part that drives the bearing to rotate.

2. The zero-discharge treatment device for oil well wastewater according to claim 1 is characterized by: The linkage comprises a first guide wheel and a second guide wheel, wherein the first guide wheel is rotatably arranged on one side of a base plate, a bearing groove for rotationally connecting a bearing is arranged on the base plate, a first tooth portion is arranged on the circumferential outer wall of the bearing, a second tooth portion is arranged on the top of the first guide wheel, the first tooth portion passes through the bearing groove and is meshed with the second tooth portion, the second guide wheel is fixed on the outer wall of the flotation tank, a first connecting rope is connected between the first guide wheel and the second guide wheel, the second guide wheel is rotatably arranged on the outer wall of the flotation tank and is connected to the connecting shaft by a second connecting rope, and a long rod is fixedly connected between the multiple groups of first semi-ring pipe columns in the flotation tank.

3. The zero-discharge treatment device for oil well wastewater according to claim 2 is characterized by: A first torsion spring is connected between the bearing and the base plate.

4. The zero-discharge treatment device for oil well wastewater according to claim 1 is characterized by: An air jet groove is provided on the side of the base plate close to the scraper, an air cavity connected to the air jet groove is provided in the base plate, a sealing plate is provided in the air cavity for sliding up and down, a side plate that fits with the inner wall of the air cavity is provided on the side of the sealing plate close to the air jet groove, a docking groove is provided on the side plate, a stop block is provided at the bottom of the sealing plate, a stop rod that abuts against the stop block is provided at the bottom ends of the first semi-ring pipe column and the second semi-ring pipe column, and a return spring is provided on the top of the sealing plate.

5. The zero-discharge treatment device for oil well wastewater according to claim 1 is characterized by: A switch sleeve is rotatably provided at the bottom of the air pipe, and a lower partition is provided in the hollow interior of the switch sleeve. The lower partition closes part of the opening in the hollow interior of the switch sleeve, and the upper partition closes part of the opening on the inner wall of the air pipe. A lower partition is provided at the bottom of the air pipe, and a driving member for driving the switch sleeve to rotate is provided on the first semi-ring pipe column and the second semi-ring pipe column.

6. The zero-discharge treatment device for oil well wastewater according to claim 5 is characterized by: A second partial spiral groove is provided on the outer wall of the switch sleeve, and the driving member includes an abutment rod arranged inside the cavity of the first semi-ring tube column and the second semi-ring tube column. The inner walls of the cavities of the first semi-ring tube column and the second semi-ring tube column are both provided with rod grooves for the abutment rod to slide horizontally. A tension spring for driving the abutment rod to slide outward is provided in the rod groove. A slope is provided on the top of the abutment rod. Two groups of driving members are provided in the cavity. When the first semi-ring tube column or the second semi-ring tube column moves upward, the upper group of abutment rods abuts against the second spiral groove to drive the switch sleeve to rotate. After the switch sleeve rotates, the dissolved gas in the trachea enters the cavity. When the first semi-ring tube column or the second semi-ring tube column moves downward, the lower group of abutment rods abuts against the second spiral groove to drive the switch sleeve to rotate in the opposite direction. After the switch sleeve rotates in the opposite direction, the dissolved gas in the trachea cannot enter the cavity.

7. The zero-discharge treatment device for oil well wastewater according to claim 1 is characterized by: A cleaning plate for cleaning the surface of the scraper plate is provided above the flotation tank. The cleaning plate is rotatably arranged on the inner wall of the flotation tank. A second torsion spring is connected to the rotating connection between the cleaning rod and the flotation tank. Impurities on the surface of the scraper plate after passing through the cleaning plate are scraped off once. A guide groove is provided on the inner wall of the cleaning plate, and a guide pipe is provided on the outer wall of the flotation tank. One end of the guide pipe is connected to the guide groove and the other end is connected to the slag discharge tank. A flushing pipe is provided on one side of the cleaning plate, and the bottom end of the cleaning pipe is connected to the guide groove.

8. A treatment process using the zero-discharge treatment device for oil well wastewater according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Process the oil well wastewater through a screen to remove large particles of impurities; Step 2: The filtered wastewater is discharged into the flotation tank. The first half-ring pipe column and the second half-ring pipe column are driven to move up and down reciprocatingly by a stable gas outlet mechanism in the flotation tank and output dissolved gas, and bubbles are continuously generated to gradually bring impurities in the wastewater to the surface of the wastewater, and the surface impurities are scraped to the slag discharge tank by a scraper; Step 3: discharge the wastewater from the flotation tank to the UV ozone reactor to decompose the organic matter in the oil well wastewater into CO2 and H2O; Step 4: Passing the treated water through a membrane filtration treatment device to reduce the salt content in the oil well wastewater; Step 5: Pass the treated water into the membrane concentrated water evaporation and desalination device for desalination treatment, and finally recycle the water.

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