CN117886487A - Method for removing COD (chemical oxygen demand) from oilfield high-salinity wastewater and treatment equipment thereof - Google Patents

Abstract

The invention discloses a method for removing COD from oilfield high-salt wastewater and treatment equipment thereof, belonging to the technical field of wastewater treatment. Including the mounting bracket, be provided with the retort body on the mounting bracket, be provided with the retort top cap on the retort body, the inboard rotatory nestification of retort top cap has the swivel mount, be provided with the filling pipe on the retort body, be provided with the exhaust pipe on the retort body, be provided with driving motor on the mounting bracket, one side of mounting bracket is provided with ozone generator. According to the invention, the quantitative filling assembly is arranged, and different amounts of iron-carbon mixture are put in according to different weights of treated wastewater, so that the phenomenon of caking and passivation of wastewater caused by excessive iron-carbon mixture is prevented, the phenomenon of incomplete micro-electrolysis reaction due to insufficient iron-carbon mixture is prevented, and the incomplete removal of COD in the wastewater is prevented.

Description

Method for removing COD (chemical oxygen demand) from oilfield high-salinity wastewater and treatment equipment thereof

Technical Field

The invention relates to the technical field of wastewater treatment, in particular to a method for removing COD (chemical oxygen demand) from oilfield high-salt wastewater and treatment equipment thereof.

Background

In the high-salt wastewater generated by the oil field, COD is mainly residual refractory substances after biochemical treatment, the treatment difficulty is great, the treated wastewater is required to be further treated by adopting new technical measures, the COD concentration of the discharged wastewater is reduced, and the discharge of the wastewater reaching the standard is realized.

In order to achieve the standard emission, the prior art generally adopts a technical method for treating the oil refining high-salt wastewater by catalytic ozone oxidation, wherein the catalytic ozone oxidation is a method capable of oxidizing and treating organic matters which are difficult to be oxidized or degraded by ozone alone at normal temperature and normal pressure, and a certain high-efficiency catalyst is added in the oxidation process to improve the ozone utilization rate.

Catalytic ozonation technology related to ozonation has become one of the effective methods for wastewater treatment, and the catalytic ozonation technology has less research in high-salt wastewater at present, but has the advantages of complete reaction, high speed, no secondary pollution and the like.

Therefore, the invention provides a method for removing COD from oilfield high-salt wastewater and treatment equipment thereof.

However, the existing treatment equipment for removing COD from oilfield high-salt wastewater is used for carrying out oxidation reaction by introducing ozone into the treated wastewater, and the iron-carbon mixture is used as a micro-electrolysis filler for wastewater treatment, so that the pH value of the solution in the reaction process can be controlled, and the wastewater treatment efficiency can be improved.

Aiming at the problems, innovative design is urgently needed on the basis of the original design.

Disclosure of Invention

The invention aims to provide a method for removing COD from oilfield high-salt wastewater and treatment equipment thereof, which are used for solving the problems that the prior art needs to manually and frequently throw materials into the treatment equipment, iron and carbon elements cannot be thrown quantitatively along with the sewage capacity, so that caking and passivation are easy to occur in the solution, and meanwhile, micro-electrolysis reaction cannot be fully performed between the fixed-point quantitative throwing and the wastewater solution, so that incomplete reaction of the wastewater solution is caused, and COD removal efficiency is low.

In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a treatment facility that COD was got rid of to oil field high salt waste water, includes the mounting bracket, be provided with the retort body on the mounting bracket, be provided with the retort top cap on the retort body, the inboard rotatory nestification of retort top cap has the swivel mount, be provided with the filling tube on the retort body, be provided with the discharge tube on the retort body, be provided with driving motor on the mounting bracket, one side of mounting bracket is provided with ozone generator, still including quantitative filling subassembly, quantitative filling subassembly is installed on the mounting bracket, quantitative filling subassembly is used for waste water treatment ration to smash to add coke and iron mixture, smashes the subassembly, smash the subassembly setting and be in on the retort top cap, smash the subassembly and be used for smashing coke and iron mixture in the quantitative filling subassembly, stirring subassembly is installed the bottom of swivel mount, stirring subassembly is used for stirring treatment waste water, makes it and coke and iron mixture fully contact.

Preferably, the mounting frame is arranged to be of a C-shaped structure, the reaction tank body is made of stainless steel materials, the discharge pipe is arranged below the filling pipe and is arranged in a mounting mode, and the rotating frame and the mounting frame are arranged in a mutually perpendicular mode.

Preferably, the quantitative filling component comprises a first piston plate, the first piston plate is slidably mounted on the inner side of the reaction tank body, a connecting rod is connected to the bottom of the first piston plate, a second piston plate is connected to the bottom of the connecting rod, a piston cylinder is mounted on the inner side of the reaction tank body in a nested manner, and the second piston plate slides on the inner side of the piston cylinder.

Preferably, the bottom of piston cylinder is connected with the fluid pipe, and the bottom setting installation that the fluid pipe runs through the retort body, the inboard of fluid pipe is provided with the piston board III, the end connection of piston board III has the push rod, the end connection of push rod has the slip baffle, the outside of slip baffle is provided with the storage box, and the slip baffle slides in the inboard of storage box, the storage box is installed on the retort top cap.

Preferably, the first piston plate and the second piston plate are arranged in parallel, the second piston plate is made of rubber materials, the piston cylinder is mounted on the inner wall of the bottom of the reaction tank body in a clinging mode, the oil pipe is made of a metal pipe, a limiting block is arranged at the upper end portion of the oil pipe, the push rod is arranged in a Y-shaped mode, the sliding partition plate and the push rod are arranged in parallel, and the storage box is mounted perpendicular to the top of the top cover of the reaction tank.

Preferably, the crushing assembly comprises a first connecting pipe, the first connecting pipe is installed in an equiangular distribution mode on the rotating frame, a crushing box is connected to the top of the first connecting pipe, a filter screen is installed at the top of the first connecting pipe, a rotating shaft is installed in the middle of the crushing box and penetrates through the crushing box, a driving motor is connected to the input end of the rotating shaft, crushing cutters are installed in an equiangular distribution mode on the surface of the rotating shaft, scraping plates are connected to the bottom of the crushing cutters, a rotary installation pipe is connected to the bottom of the first connecting pipe, and the rotary installation pipe penetrates through the rotating frame to be installed.

Preferably, the first connecting pipe is installed at the top of the rotating frame, the rotating shaft is installed at the bottom of the crushing box in a perpendicular mode, the crushing box is installed below the storage box, the crushing knife is provided with a crushing acute angle, the crushing knife is made of wear-resistant materials, the scraping plate is made of rubber materials, and the first rotating installation pipe is communicated with the first connecting pipe.

Preferably, the stirring assembly comprises a first gear, the first gear is installed in the bottom of the rotating frame, the first gear is meshed with the second gear, the second gear is sleeved on the outer side of the rotating installation tube, the bottom of the first gear is connected with a mounting plate, the bottom of the rotating installation tube is connected with an upper cover plate, the bottom of the upper cover plate is connected with a contact cylinder, contact holes are distributed on the surface of the contact cylinder at equal angles, the contact holes are distributed on the surface of the contact cylinder at equal angles, paddles are mounted on the inner side of the contact cylinder at equal angles, the paddles are distributed on the inner wall of the contact cylinder at equal angles, a second connecting tube is mounted on the mounting plate at equal angles, the second connecting tube penetrates through the upper cover plate, a spray head is connected to the end portion of the second connecting tube, the second connecting tube is connected with an ozone generator through an air tube, and the air tube penetrates through the reaction tank body.

Preferably, the first gear and the second gear are arranged on the same plane, the contact cylinder is in an octagonal star shape, the spray head is arranged above the blade, the spray head is arranged at the position, close to the upper cover plate, inside the contact cylinder, and the air pipe uses a hose.

The application also provides a method for removing COD from the high-salt wastewater of the oil field, which comprises the following specific operation steps:

s1, discharging wastewater to be treated into a treatment tank, adding a flocculating agent into the tank, and standing for 2-3 hours, wherein suspended matters and most organic matters in the wastewater are converted into sediment;

S2, pouring the wastewater into treatment equipment, and introducing ozone for treatment to reduce COD in the wastewater;

S3, adding sodium hydroxide and sodium carbonate into the wastewater treated in the step S2 to adjust the pH value of the wastewater, reducing the salt content in the wastewater, and then aerating to enable the sodium hydroxide and the sodium carbonate to react with precipitable metal ions in the wastewater to generate precipitate;

S4, separating the precipitate from the wastewater.

Compared with the prior art, the invention has at least the following beneficial effects:

In the scheme, the COD in the oilfield wastewater can be reduced more quickly and more efficiently, and the salt content in the wastewater can be reduced, so that the wastewater reaches the emission standard.

Through being provided with quantitative filling subassembly, the processing waste water is filled to the retort body, receive the self weight influence of processing waste water in the retort body, first in the inside downwardly moving of retort body of extrusion piston board, make piston board one drive piston board two in the inboard downwardly moving of piston section of thick bamboo, the inboard fluid of extrusion piston section of thick bamboo, make fluid enter into the fluid intraduct, the intraductal piston board three-dimensional bin direction removal of extrusion fluid, thereby make the piston board three drive the push rod, will slide the baffle to the push rod be close to the direction of bin, make the escape hole groove of bin bottom, make coke and iron drop in the below crushing box, according to the different, kong Caoda little difference of processing waste water weight, put in the iron carbon mixture of different quantity, prevent that iron carbon mixture too much from leading to waste water to produce caking, passivation phenomenon, iron carbon mixture is too little, micro-electrolysis reaction is incomplete, can't get rid of COD in the waste water incompletely.

Through being provided with stirring subassembly, driving motor drives the rotation axis and rotates, make the swivel mount rotate in the inboard of reaction tank top cap, drive gear one and rotate, gear two and gear one intermeshing rotate, gear two drives rotatory mounting tube and rotate, thereby make the contact tube follow gear one pivoted in-process, the rotation carries out, the contact tube can fully contact with the wastewater treatment, ozone is spouted from the shower nozzle, make the paddle rotate, the inside production of contact tube possesses rotatory vortex, make coke and iron mixture can fully take place the reaction, can throw out coke and iron mixture from the contact hole and can fully contact with the wastewater treatment, take place electrochemical reaction after wastewater treatment and iron carbon mixture contact, form electrolyte solution, COD is got rid of wastewater solution, improve wastewater solution micro-electrolysis oxidation reaction's efficiency, make solution can react completely, wastewater treatment cost is reduced.

Drawings

FIG. 1 is a schematic diagram of a treatment device for removing COD from oilfield high-salinity wastewater;

FIG. 2 is a schematic cross-sectional view of a reactor body according to the present invention;

FIG. 3 is a schematic view showing the internal structure of the reaction tank body of the present invention;

FIG. 4 is a schematic view showing the bottom structure of the top cover of the reaction tank according to the present invention;

FIG. 5 is a schematic view of the structure of the dosing assembly of the present invention;

FIG. 6 is a schematic view of the pulverizing assembly of the present invention;

FIG. 7 is a cross-sectional view of the stirring assembly of the present invention;

FIG. 8 is a bottom view of the stirring assembly of the present invention;

FIG. 9 is a schematic view of a stirring assembly according to the present invention;

FIG. 10 is a cross-sectional view of a contact tube structure of the present invention;

FIG. 11 is a schematic view of a contact cylinder according to the present invention;

Fig. 12 is an enlarged schematic view of the structure of fig. 11 a according to the present invention.

In the figure: 1. a mounting frame; 2. a reaction tank body; 3. a top cover of the reaction tank; 4. a rotating frame; 5. a filling pipe; 6. a discharge pipe; 7. a dosing assembly; 71. a first piston plate; 72. a connecting rod; 73. a second piston plate; 74. a piston cylinder; 75. an oil pipe; 76. a third piston plate; 77. a push rod; 78. a sliding partition; 79. a storage box; 8. a crushing assembly; 81. a first connecting pipe; 82. a crushing box; 83. a filter screen; 84. a rotation shaft; 85. a crushing knife; 86. a scraper; 87. rotating the mounting tube; 9. a stirring assembly; 91. a first gear; 92. a second gear; 930. a mounting plate; 93. an upper cover plate; 94. a contact cylinder; 940. a contact hole; 95. a paddle; 96. a second connecting pipe; 97. a spray head; 98. an air pipe; 10. a driving motor; 11. an ozone generator.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1-12, a treatment facility for removing COD from oilfield high-salt wastewater comprises a mounting frame 1, wherein a reaction tank body 2 is arranged on the mounting frame 1, a reaction tank top cover 3 is arranged on the reaction tank body 2, a rotating frame 4 is rotatably nested on the inner side of the reaction tank top cover 3, a filling pipe 5 is arranged on the reaction tank body 2, a discharge pipe 6 is arranged on the reaction tank body 2, a driving motor 10 is arranged on the mounting frame 1, an ozone generator 11 is arranged on one side of the mounting frame 1, a quantitative filling assembly 7 is further arranged on the mounting frame 1, the quantitative filling assembly 7 is used for quantitatively crushing and adding coke and iron mixtures in wastewater treatment, a crushing assembly 8 is arranged on the reaction tank top cover 3, the crushing assembly 8 is used for crushing the coke and iron mixtures in the quantitative filling assembly 7, a stirring assembly 9 is arranged at the bottom of the rotating frame 4, and the stirring assembly 9 is used for stirring and treating wastewater so as to make the wastewater fully contact with the coke and iron mixtures.

In this embodiment, mounting bracket 1 sets up to C type structure, improves the supporting stability of mounting bracket 1, and retort body 2 uses stainless steel material, improves retort body 2's corrosion resistance, prevents to react with the treatment waste water, and discharge tube 6 is located the below setting installation of filling pipe 5, and swivel mount 4 sets up the installation with mounting bracket 1 mutually perpendicular, improves the running stability of device.

As an implementation manner in this embodiment, the dosing assembly 7 includes a first piston plate 71, the first piston plate 71 is slidably mounted inside the reaction tank body 2, a connecting rod 72 is connected to the bottom of the first piston plate 71, a second piston plate 73 is connected to the bottom of the connecting rod 72, a piston cylinder 74 is nested inside the reaction tank body 2, and the second piston plate 73 slides inside the piston cylinder 74.

As an implementation manner in this embodiment, the bottom of the piston cylinder 74 is connected with an oil pipe 75, and the oil pipe 75 penetrates through the bottom of the reaction tank body 2 to be installed, the inner side of the oil pipe 75 is provided with a third piston plate 76, the end of the third piston plate 76 is connected with a push rod 77, the end of the push rod 77 is connected with a sliding partition plate 78, the outer side of the sliding partition plate 78 is provided with a storage box 79, the sliding partition plate 78 slides on the inner side of the storage box 79, and the storage box 79 is installed on the reaction tank top cover 3.

In this embodiment, the first piston plate 71 and the second piston plate 73 are installed in parallel, the second piston plate 73 is made of rubber material, the wear resistance of the second piston plate 73 is improved, the service life is prolonged, the piston cylinder 74 is installed to be close to the inner wall of the bottom of the reaction tank body 2, the oil pipe 75 is made of a metal pipe, a limiting block is arranged at the upper end of the oil pipe 75, the push rod 77 is of a Y shape, the rationality of the structure is improved, the sliding partition 78 and the push rod 77 are installed in parallel, and the storage box 79 is installed perpendicular to the top of the reaction tank top cover 3.

As an implementation manner in this embodiment, the crushing assembly 8 includes a first connecting pipe 81, the first connecting pipe 81 is installed on the rotating frame 4 at equal angular distribution, the top of the first connecting pipe 81 is connected with a crushing box 82, a filter screen 83 is installed at the top of the first connecting pipe 81, a rotation shaft 84 is installed in the middle of the crushing box 82, the rotation shaft 84 penetrates through the crushing box 82, the input end of the rotation shaft 84 is connected with the driving motor 10, a crushing knife 85 is installed at equal angular distribution on the surface of the rotation shaft 84, a scraper 86 is connected at the bottom of the crushing knife 85, a rotary installation pipe 87 is connected at the bottom of the first connecting pipe 81, and the rotary installation pipe 87 penetrates through the rotating frame 4.

In this embodiment, the first connecting pipe 81 is installed vertically to the top of the rotating frame 4, the rotating shaft 84 is installed vertically to the bottom surface of the crushing box 82, the crushing box 82 is installed below the storage box 79, the crushing knife 85 is provided with a crushing acute angle, the crushing knife 85 is made of wear-resistant materials, the wear resistance of the scraping plate 86 is improved, the scraping plate 86 is made of rubber materials, the rotating installation pipe 87 is communicated with the first connecting pipe 81, and the stability of material injection is improved.

As an implementation manner in this embodiment, the stirring assembly 9 includes a first gear 91, the first gear 91 is installed at the bottom of the rotating frame 4, the first gear 91 is meshed with a second gear 92, the second gear 92 is sleeved outside the rotating installation tube 87, the bottom of the first gear 91 is connected with a mounting plate 930, the bottom of the rotating installation tube 87 is connected with an upper cover plate 93, the bottom of the upper cover plate 93 is connected with a contact cylinder 94, contact holes 940 are equidistantly distributed on the surface of the contact cylinder 94, the contact holes 940 are uniformly distributed on the surface of the contact cylinder 94, paddles 95 are uniformly distributed on the inner side of the contact cylinder 94, the paddles 95 are uniformly distributed on the inner wall of the contact cylinder 94, connecting pipes two 96 are uniformly distributed on the mounting plate 930, the connecting pipes two 96 penetrate through the upper cover plate 93, the ends of the connecting pipes two 96 are connected with spray heads 97, the connecting pipes two 96 are mutually connected with the ozone generator 11 through air pipes 98, and the air pipes 98 penetrate the reaction tank body 2,

In this embodiment, the first gear 91 and the second gear 92 are installed on the same plane, so as to improve the running stability of the device, the contact cylinder 94 is in an octagonal star shape, the contact effect of the contact cylinder 94 and the wastewater to be treated is improved, the spray head 97 is installed above the paddle 95, the triggering stability of the device is improved, the spray head 97 is installed at the position, close to the upper cover plate 93, inside the contact cylinder 94, and the air pipe 98 uses a hose.

Working principle: in use, an operator pours a mixture of coke and scrap iron into the storage box 79, opens the filling pipe 5, fills the reaction tank body 2 with treatment wastewater, is influenced by the weight of the treatment wastewater in the reaction tank body 2, extrudes the first piston plate 71 to move downwards in the reaction tank body 2, drives the second piston plate 73 to move downwards in the piston cylinder 74, extrudes oil in the piston cylinder 74, makes the oil enter the oil pipe 75, extrudes the third piston plate 76 in the oil pipe 75 to move towards the storage box 79, drives the third piston plate 76 to drive the push rod 77, pushes the sliding partition 78 towards the push rod 77 to approach the storage box 79, enables the leakage hole groove at the bottom of the storage box 79 to enable the coke and iron to fall into the lower crushing box 82, starts the driving motor 10, drives the rotating shaft 84 to rotate, enables the crushing cutter 85 to drive the scraping plate 86 to rotate, the crushing knife 85 crushes the coke and the iron in the crushing box 82 by rotating, the scraping plate 86 scrapes the crushed coke and the iron to mix, meanwhile, the coke and the iron crushed to proper sizes are sieved through the filter screen 83 and fall into the first connecting pipe 81 by scraping, the first connecting pipe 81 is connected with the rotating mounting pipe 87 and falls into the contact cylinder 94 connected with the upper cover plate 93, the driving motor 10 drives the rotating shaft 84 to rotate, the rotating frame 4 rotates at the inner side of the top cover 3 of the reaction tank, the gear I91 is driven to rotate, the gear II 92 and the gear I91 are meshed with each other to rotate, the gear II 92 drives the rotating mounting pipe 87 to rotate, the contact cylinder 94 rotates along with the rotation of the gear I91, the contact cylinder 94 can fully contact the treated wastewater, the ozone generator 11 is started, ozone is delivered into the second connecting pipe 96 through the air pipe 98, the ozone is sprayed out from the spray head 97, the paddle 95 rotates, a rotating vortex is generated in the contact cylinder 94, coke and iron mixture can fully react, meanwhile, the coke and iron mixture can be thrown out from the contact hole 940 to fully contact with treated wastewater, electrochemical reaction is carried out after the treated wastewater contacts with iron-carbon mixture to form electrolyte solution, the iron-carbon mixture reacts with ozone, when the iron-carbon mixture is immersed in the electrolyte solution, a countless micro battery system is formed due to the electrode potential difference of 1.2V between Fe and C, an electric field is formed in the action space of the micro battery system, a large amount of Fe & lt2+ & gt is generated by anode reaction and enters the wastewater, and is oxidized into Fe & lt3+ & gt to form a flocculating agent with higher adsorption flocculation activity, COD in the wastewater is removed, and after the reaction is completed, the treated wastewater is discharged from the discharge pipe 6.

What has not been described in detail in this specification is prior art that is well known to those skilled in the art, and in the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.

Claims (10)

1. The utility model provides a treatment facility that COD was got rid of to high salt waste water in oil field which characterized in that: the novel reaction tank comprises a mounting frame (1), wherein a reaction tank body (2) is arranged on the mounting frame (1), a reaction tank top cover (3) is arranged on the reaction tank body (2), a rotating frame (4) is rotatably nested at the inner side of the reaction tank top cover (3), a filling pipe (5) is arranged on the reaction tank body (2), a discharge pipe (6) is arranged on the reaction tank body (2), a driving motor (10) is arranged on the mounting frame (1), and an ozone generator (11) is arranged at one side of the mounting frame (1);

The device also comprises a quantitative filling assembly (7), wherein the quantitative filling assembly (7) is arranged on the mounting frame (1), and the quantitative filling assembly (7) is used for quantitatively crushing and adding a mixture of coke and iron in wastewater treatment;

the crushing assembly (8) is arranged on the top cover (3) of the reaction tank, and the crushing assembly (8) is used for crushing the mixture of the coke and the iron in the quantitative filling assembly (7);

And the stirring assembly (9) is arranged at the bottom of the rotating frame (4), and the stirring assembly (9) is used for stirring and treating wastewater so as to be fully contacted with the coke and iron mixture.

2. The treatment equipment for removing COD from oilfield high-salinity wastewater according to claim 1, wherein: the mounting frame (1) is of a C-shaped structure, the reaction tank body (2) is made of stainless steel, the discharge pipe (6) is arranged below the filling pipe (5) in a mounting mode, and the rotating frame (4) and the mounting frame (1) are arranged in a mutually perpendicular mode.

3. The treatment equipment for removing COD from oilfield high-salinity wastewater according to claim 2, wherein: the quantitative filling assembly (7) comprises a first piston plate (71), the first piston plate (71) is slidably mounted on the inner side of the reaction tank body (2), a connecting rod (72) is connected to the bottom of the first piston plate (71), a second piston plate (73) is connected to the bottom of the connecting rod (72), a piston cylinder (74) is mounted on the inner side of the reaction tank body (2) in a nested mode, and the second piston plate (73) slides on the inner side of the piston cylinder (74).

4. The treatment equipment for removing COD from oilfield high-salinity wastewater according to claim 3, wherein: the bottom of piston tube (74) is connected with fluid pipe (75), and the bottom setting installation that fluid pipe (75) runs through retort body (2), the inboard of fluid pipe (75) is provided with piston plate three (76), the end connection of piston plate three (76) has push rod (77), the end connection of push rod (77) has slip baffle (78), the outside of slip baffle (78) is provided with storage box (79), and slip baffle (78) are in the inboard slip of storage box (79), storage box (79) are installed on retort top cap (3).

5. The treatment equipment for removing COD from oilfield high-salinity wastewater according to claim 4, wherein: the piston plate I (71) and the piston plate II (73) are installed in parallel, the piston plate II (73) is made of rubber materials, the piston cylinder (74) is installed on the inner wall of the bottom of the reaction tank body (2) in a clinging mode, the oil pipe (75) is made of a metal pipe, a limiting block is arranged at the upper end portion of the oil pipe (75), the push rod (77) is arranged in a Y-shaped mode, the sliding partition plate (78) and the push rod (77) are installed in parallel, and the storage box (79) is installed perpendicular to the top of the reaction tank top cover (3).

6. The treatment equipment for removing COD from oilfield high-salinity wastewater according to claim 5, wherein: crushing subassembly (8) are including connecting pipe one (81), connecting pipe one (81) equiangular distribution installs on swivel mount (4), the top of connecting pipe one (81) is connected with crushing box (82), filter screen (83) are installed on the top of connecting pipe one (81), the mid-mounting of crushing box (82) has rotation axis (84), and rotation axis (84) run through crushing box (82) and install, the input of rotation axis (84) is connected with driving motor (10), crushing sword (85) are installed to the surface equiangular distribution of rotation axis (84), the bottom of crushing sword (85) is connected with scraper blade (86), the bottom of connecting pipe one (81) is connected with rotatory installation tube (87), and rotatory installation tube (87) run through swivel mount (4) and install.

7. The treatment equipment for removing COD from oilfield high-salinity wastewater according to claim 6, wherein: the first connecting pipe (81) is perpendicular to the top of the rotating frame (4), the rotating shaft (84) is perpendicular to the bottom surface of the crushing box (82) and is installed, the crushing box (82) is arranged below the storage box (79), the crushing knife (85) is provided with a crushing acute angle, the crushing knife (85) is made of wear-resistant materials, the scraping plate (86) is made of rubber materials, and the rotating installation pipe (87) is mutually communicated with the first connecting pipe (81).

8. The treatment equipment for removing COD from oilfield high-salinity wastewater according to claim 7, wherein: the stirring assembly (9) comprises a first gear (91), the first gear (91) is installed at the bottom of the rotating frame (4), the first gear (91) is meshed with a second gear (92), the second gear (92) is sleeved on the outer side of the rotating installation tube (87), the bottom of the first gear (91) is connected with a mounting plate (930), the bottom of the rotating installation tube (87) is connected with an upper cover plate (93), the bottom of the upper cover plate (93) is connected with a contact cylinder (94), contact holes (940) are distributed on the surface of the contact cylinder (94) at equal angles, the contact holes (940) are distributed on the surface of the contact cylinder (94) at equal angles, paddles (95) are distributed on the inner wall of the contact cylinder (94) at equal angles, a connecting tube (96) is installed on the mounting plate (930) at equal angles, the connecting tube (96) penetrates through the upper cover plate (93), the end of the connecting tube (96) is connected with a spray head (97), and the connecting tube (98) penetrates through the connecting tube body (98) and penetrates through the reaction tank (2).

9. The treatment equipment for removing COD from oilfield high-salinity wastewater according to claim 8, wherein: the gear I (91) and the gear II (92) are arranged on the same plane, the contact cylinder (94) is in an octagonal star shape, the spray head (97) is arranged above the blade (95), the spray head (97) is arranged at the position, close to the upper cover plate (93), on the inner side of the contact cylinder (94), and the air pipe (98) is a hose.

10. A method for removing COD from oilfield high-salinity wastewater, which is realized by using the treatment equipment for removing COD from oilfield high-salinity wastewater according to any one of claims 1-9, and is characterized in that: the specific operation steps are as follows:

s1, discharging wastewater to be treated into a treatment tank, adding a flocculating agent into the tank, and standing for 2-3 hours, wherein suspended matters and most organic matters in the wastewater are converted into sediment;

S2, pouring the wastewater into treatment equipment, and introducing ozone for treatment to reduce COD in the wastewater;

S3, adding sodium hydroxide and sodium carbonate into the wastewater treated in the step S2 to adjust the pH value of the wastewater, reducing the salt content in the wastewater, and then aerating to enable the sodium hydroxide and the sodium carbonate to react with precipitable metal ions in the wastewater to generate precipitate;

S4, separating the precipitate from the wastewater.