Integrated multifunctional oilfield sewage treatment device

Abstract

The invention relates to an integrated multifunctional oilfield sewage treatment device which comprises an electric flocculation system, an air flotation system, a hydrogen peroxide preparation system and a photocatalytic oxidation system, the electric flocculation system, the air flotation system and the photocatalytic oxidation system are sequentially communicated through pipelines, and the hydrogen peroxide preparation system is communicated with the air flotation system through a pipeline. Advanced water treatment processes such as electric flocculation, air flotation and photocatalytic oxidation are integrated, and the device has good adaptability to oil and gas field sewage of a complex system; meanwhile, the whole process does not need additional water treatment chemicals, the cost is low, and the field management difficulty is small; in addition, an automatic folding structure is adopted, the road transportation requirement is met, the effective illumination area is increased by more than three times after unfolding, the photocatalytic oxidation reaction efficiency is greatly improved, and a guarantee is provided for water quality standard reaching.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment during oil and gas field development, and in particular to an integrated multifunctional oilfield wastewater treatment device. Background Art

[0002] As the development of oil and gas resources gradually deepens, the amount of clean water used and the amount of wastewater produced in oil and gas field development increase accordingly. On the one hand, this leads to an increase in the cost of oil and gas field exploration and development, and on the other hand, it puts great pressure on water resources and the water environment. In addition, my country's oil and gas-rich areas are environmentally sensitive and water resources are scarce, and the standards and requirements for wastewater treatment generated by oil and gas field development are increasing.

[0003] Oil and gas field wastewater mainly includes drilling wastewater, operational fluid and produced water, etc. Its characteristics are complex components, stable system, high viscosity, severe emulsification, and many types of pollutants. It contains not only chemical residues added during the operation, but also organic matter, impurities, bacteria and minerals returned from the formation, etc., which makes it difficult to treat and recycle it up to the standard. In order to achieve the treatment up to the standard, chemical demulsification, chemical flocculation, sedimentation, flotation, chemical oxidation, filtration and other process means are currently used. The amount of chemical agents added is large, the process flow is long, and the investment and use costs are high. Excessive use of chemical agents has an adverse effect on subsequent recycling. In addition, due to the involvement of many supporting equipment, high transportation costs, and large land area, it is difficult to achieve well treatment, which has certain limitations. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an integrated multifunctional oilfield sewage treatment device, aiming to solve the problems in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] An integrated multifunctional oilfield wastewater treatment device comprises an electric flocculation system, an air flotation system, a hydrogen peroxide preparation system and a photocatalytic oxidation system. The electric flocculation system, the air flotation system and the photocatalytic oxidation system are connected in sequence through pipelines, and the hydrogen peroxide preparation system is connected to the air flotation system through pipelines; the electric flocculation system is used to perform demulsification and flocculation treatment on the wastewater, the air flotation system generates bubbles and mixes them with the flocculated wastewater to remove oil and suspended matter, and the wastewater after air flotation and the hydrogen peroxide generated by the hydrogen peroxide preparation system are sent to the photocatalytic oxidation system for catalytic oxidation to remove organic matter.

[0007] The beneficial effects of the present invention are as follows: during the treatment process, firstly, the electric flocculation system can realize demulsification of oilfield sewage through electric current, and on the other hand, the Fe ions generated by anode electrolysis are helpful for flocculation of oilfield sewage, and also serve as catalysts for back-end photocatalytic oxidation; then, the air flotation system compresses and cuts the air into micro-nano bubbles, and mixes them with the sewage after flocculation reaction to realize air flotation and remove pollutants such as oil and suspended matter; finally, the sewage after air flotation and the hydrogen peroxide prepared by the hydrogen peroxide preparation system enter the photocatalytic oxidation system together for photocatalytic reaction to remove organic matter in the sewage, and the sewage treatment efficiency is high and the treatment effect is better.

[0008] The present invention integrates advanced water treatment processes such as electro-flocculation, gas flotation, photocatalytic oxidation, etc., and has good adaptability to complex oil and gas field wastewater. At the same time, the whole process does not require external water treatment agents, has low cost, and is less difficult to manage on site.

[0009] Based on the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, the air flotation system comprises a box, a scraping unit and a reflux dissolved air unit, the space inside the box is divided into a flotation area, a slag collection area and a clean water area in sequence by two vertically arranged partitions; a water collection pipeline group is installed in the flotation area, and the water collection pipeline group is connected to the photocatalytic oxidation system through a pipeline; the scraping unit is installed on the top of the box, and its two ends extend to the flotation area and the slag collection area respectively, and is used to scrape the slag in the flotation area and send it to the slag collection area;

[0011] The electric flocculation system is connected to the flotation zone through a pipeline, one end of the reflux dissolved air unit is connected to the clean water zone through a pipeline, and the other end is connected to the pipeline connecting the electric flocculation system and the flotation zone through a pipeline; the hydrogen peroxide preparation system is connected to the flotation zone through a pipeline.

[0012] The beneficial effect of adopting the above further scheme is that during the treatment process, firstly, the electric flocculation system can realize oilfield wastewater demulsification through electric current on the one hand, and on the other hand, the Fe ions generated by anode electrolysis are helpful for flocculation of oilfield wastewater, and are also catalysts for back-end photocatalytic oxidation; then, the flocculated wastewater is sent to the flotation area, and at the same time, bubbles are generated by the reflux dissolved air unit and sent to the flotation area so that impurities float on the surface of the wastewater, and the impurities on the surface of the wastewater are scraped off to the slag collection area by the scraping unit to remove pollutants such as oil and suspended matter; finally, the wastewater after air flotation and the hydrogen peroxide prepared by the hydrogen peroxide preparation system enter the photocatalytic oxidation system for photocatalytic reaction to remove organic matter in the wastewater, and the wastewater treatment efficiency is high and the treatment effect is better.

[0013] Furthermore, the electro-flocculation system comprises a water supply pump and an electrolysis unit I, and two ends of the electrolysis unit I are respectively connected to the outlet of the water supply pump and the flotation zone through pipelines.

[0014] The beneficial effect of adopting the above further scheme is that during the treatment process, the sewage to be treated is sent to the electrolysis unit I through the water supply pump. On the one hand, the electrolysis unit I can achieve oilfield sewage demulsification through electric current, and on the other hand, the Fe ions generated by anode electrolysis help the flocculation of oilfield sewage and are also a catalyst for subsequent photocatalytic oxidation.

[0015] Furthermore, the hydrogen peroxide preparation system includes a circulation pump and an electrolysis unit II, the inlet of the circulation pump is connected to the clean water zone through a pipeline, and the outlet of the circulation pump is connected to one end of the electrolysis unit II through a pipeline; the other end of the electrolysis unit II is connected to the flotation zone.

[0016] The beneficial effect of adopting the above further scheme is that during the treatment process, the circulation pump sends part of the clean water in the clean water area to the electrolysis unit II for electrolysis to produce low-concentration hydrogen peroxide, and sends the low-concentration hydrogen peroxide together with the sewage in the flotation area to the photocatalytic oxidation system for catalytic oxidation to remove organic matter in the sewage.

[0017] Further, the water collection pipeline group includes two water collection pipelines, the inlets of the two water collection pipelines extend to the lower part of the flotation zone respectively, and the outlets thereof extend to the outside of the upper part of the flotation zone respectively; the upper part of the flotation zone is connected to two oxidant filling pipelines, the other end of the electrolysis unit II is connected to the two oxidant filling pipelines, and the outlets of the two oxidant filling pipelines extend to the outside of both sides of the upper part of the flotation zone respectively; two overflow troughs are installed on both sides of the box body opposite to each other, and the two overflow troughs are respectively located below the outlets of the two water collection pipelines and the outlets of the two oxidant filling pipelines;

[0018] The photocatalytic oxidation system includes two reaction tanks and two drainage plates. The two reaction tanks are relatively installed on both sides of the box body and are located below the two overflow tanks. The two drainage plates are relatively installed between the two overflow tanks and the two reaction tanks.

[0019] The beneficial effect of adopting the above further scheme is that during the treatment process, the circulation pump sends part of the clean water in the clean water area to the electrolysis unit II for electrolysis to produce low-concentration hydrogen peroxide, and the low-concentration hydrogen peroxide and the sewage in the flotation area overflow into two overflow tanks through two oxidant filling pipelines, and at the same time, the sewage in the flotation area overflows into two overflow tanks through two water collection pipelines, and the sewage in the two overflow tanks flows through two drainage plates to two reaction tanks for oxidation catalytic reaction to remove organic matter in the sewage.

[0020] Furthermore, the box body is a rectangular structure, and the two reaction tanks are respectively rectangular tank structures.

[0021] The beneficial effect of adopting the above further solution is that the shapes of the box body and the two reaction tanks are reasonably designed, neat and beautiful.

[0022] Furthermore, the two reaction tanks can be moved horizontally, and can be turned upside down and positioned; one side of the two guide plates is rotationally connected to one side of the two reaction tanks through a pin II, and the other side is rotationally connected to the box body and can slide up and down.

[0023] The beneficial effect of adopting the above-mentioned further scheme is that the two reaction tanks and the two drainage plates can be unfolded separately for sewage treatment, and can also be folded to the two sides of the box respectively, occupying little space and convenient for transportation; in addition, an automated folding structure is adopted to meet road transportation requirements. After unfolding, the effective illumination area is increased by more than three times, which greatly improves the efficiency of the photocatalytic oxidation reaction and provides a guarantee for the water quality to meet the standards.

[0024] Furthermore, a pair of slides are relatively fixedly installed on both sides of the box body corresponding to the two ends of the two overflow grooves, and each pair of the slides is relatively provided with oval holes, and each oval hole extends in the vertical direction; a pin shaft I is horizontally fixedly installed on the other side of the two guide plates, and the two ends of the pin shaft I respectively extend into the corresponding two oval holes and are slidably connected.

[0025] The beneficial effect of adopting the above further scheme is that the two ends of the other side of the two guide plates are reasonably assembled with the two slides, which can ensure that the two guide plates can be flipped up and down and can move a suitable distance in the vertical direction, ensuring that the two guide plates and the two reaction tanks can be smoothly folded or unfolded and folded conveniently.

[0026] Furthermore, a pair of slide grooves are relatively fixedly installed at the bottom of both ends of the box body, and a slide rail body is installed in each pair of the slide grooves for horizontal sliding. The ends of the two slide rail bodies that are away from each other are respectively rotatably connected to one end of the two reaction tanks, and the two slide rail bodies are also rotatably connected to the two reaction tanks through the liquid cylinder II.

[0027] Liquid cylinders I are relatively fixedly installed on both sides of the box body, and the telescopic ends of the two liquid cylinders I extend vertically downward respectively, and are rotatably connected to the corresponding two slide rail bodies through two connecting rods respectively.

[0028] The beneficial effect of adopting the above further scheme is that during the folding process, the two hydraulic cylinders I respectively drive the two slide rail bodies to slide horizontally through the two connecting rods, so that the four slide rail bodies respectively push the two reaction tanks to move horizontally; at the same time, each slide rail body can drive the corresponding reaction tank to flip up and down through the corresponding hydraulic cylinder II. The design is reasonable to ensure that the reaction tank can be folded smoothly and automatically.

[0029] Furthermore, the tail ends of the two hydraulic cylinders I are rotatably connected to the two ends of the box body through ear seats I, and the tail ends of the two hydraulic cylinders II are rotatably connected to the two slide rail bodies through ear seats II; ear seats III are relatively fixedly installed on the two slide rail bodies, and one end of the two connecting rods is rotatably connected to the two ear seats III.

[0030] The beneficial effects of adopting the above further solution are simple structure, reasonable design, convenient assembly of the two hydraulic cylinders I and the two hydraulic cylinders II, and ensuring the smooth operation of each component. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is one of the three-dimensional structural schematic diagrams of the present invention in use;

[0032] Figure 2 This is one of the three-dimensional structural schematic diagrams of the present invention in use;

[0033] Figure 3 A top view of the present invention;

[0034] Figure 4 for Figure 3 Sectional view along AA direction;

[0035] Figure 5 It is a structural schematic diagram of the scraping unit in the present invention;

[0036] Figure 6 is a side view of the present invention;

[0037] Figure 7 It is a schematic diagram of the three-dimensional structure of the present invention in a folded state;

[0038] Figure 8 It is a schematic diagram of the three-dimensional structure of the present invention in a partially folded state;

[0039] Fig. 9 It is a connection block diagram of the present invention.

[0040] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0041] 1. Electric flocculation system; 1.1. Water supply pump; 1.2. Electrolysis unit I; 1.3. Mounting frame; 2. Gas flotation system; 2.1. Box; 2.1.1. Flotation area; 2.1.2. Slag collection area; 2.1.3. Clean water area; 2.1.4. Overflow tank; 2.1.5. Ear seat I; 2.1.6. Slide plate; 2.1.7. Oxidant filling pipeline; 2.1.8. Water collection pipeline; 2.1.9. Water outlet pipeline; 2.2. Slag scraping unit; 2.3. Reflux dissolved gas unit; 3. Peroxide Hydrogen preparation system; 3.1. Circulation pump; 3.2. Electrolysis unit II; 3.3. Mounting bracket; 4. Photocatalytic oxidation system; 4.1. Drain plate; 4.2. Reaction tank; 4.3. Pin I; 4.4. Pin II; 5. Folding system; 5.1. Liquid cylinder I; 5.2. Connecting rod; 5.3. Slide rail assembly; 5.3.1. Ear seat II; 5.3.2. Ear seat III; 5.3.3. Slide rail body; 5.4. Liquid cylinder II; 5.5. Slide groove; 6. Lifting pump; 7. Base. DETAILED DESCRIPTION

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0045] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0046] Example 1

[0047] like Figures 1 to 9 As shown, this embodiment provides an integrated multifunctional oilfield wastewater treatment device, including an electric flocculation system 1, an air flotation system 2, a hydrogen peroxide preparation system 3 and a photocatalytic oxidation system 4, wherein the electric flocculation system 1, the air flotation system 2 and the photocatalytic oxidation system 4 are connected in sequence through pipelines, and the hydrogen peroxide preparation system 3 is connected to the air flotation system 2 through pipelines; the electric flocculation system 1 is used to perform demulsification and flocculation treatment on the wastewater, the air flotation system 2 generates bubbles and mixes with the flocculated wastewater to remove oil and suspended matter, and the wastewater after air flotation and the hydrogen peroxide generated by the hydrogen peroxide preparation system 3 are sent to the photocatalytic oxidation system 4 for catalytic oxidation to remove organic matter.

[0048] During the treatment process, firstly, the electric flocculation system 1 can realize the demulsification of oilfield wastewater through electric current, and on the other hand, the Fe ions generated by anode electrolysis are helpful for the flocculation of oilfield wastewater, and are also the catalyst for the back-end photocatalytic oxidation; then, the air flotation system 2 compresses and cuts the air into micro-nano bubbles, and mixes them with the wastewater after the flocculation reaction to realize air flotation and remove pollutants such as oil and suspended matter; finally, the wastewater after air flotation and the hydrogen peroxide prepared by the hydrogen peroxide preparation system 3 enter the photocatalytic oxidation system 4 for photocatalytic reaction to remove organic matter in the wastewater, so that the wastewater treatment efficiency is high and the treatment effect is better.

[0049] This embodiment integrates advanced water treatment processes such as electro-flocculation, gas flotation, and photocatalytic oxidation, and has good adaptability to complex oil and gas field wastewater. At the same time, the entire process does not require external water treatment agents, has low costs, and is less difficult to manage on site.

[0050] Example 2

[0051] On the basis of Example 1, in this embodiment, the air flotation system 2 includes a box body 2.1, a scraping unit 2.2 and a reflux dissolved air unit 2.3. The space inside the box body 2.1 is divided into a flotation area 2.1.1, a slag collection area 2.1.2 and a clean water area 2.1.3 in sequence by two vertically arranged partitions; a water collection pipeline group is installed in the flotation area 2.1.1, and the water collection pipeline group is connected to the photocatalytic oxidation system 4 through a pipeline; the scraping unit 2.2 is installed on the top of the box body 2.1, and its two ends extend to the flotation area 2.1.1 and the slag collection area 2.1.2 respectively, and is used to scrape the slag in the flotation area 2.1.1 to the slag collection area 2.1.2;

[0052] The electric flocculation system 1 is connected to the flotation zone 2.1.1 through a pipeline, one end of the reflux dissolved air unit 2.3 is connected to the clean water zone 2.1.3 through a pipeline, and the other end is connected to the pipeline connecting the electric flocculation system 1 and the flotation zone 2.1.1 through a pipeline; the hydrogen peroxide preparation system 3 is connected to the flotation zone 2.1.1 through a pipeline.

[0053] During the treatment process, firstly, the electric flocculation system 1 can achieve demulsification of oilfield wastewater through electric current, and on the other hand, the Fe ions generated by anode electrolysis are helpful for flocculation of oilfield wastewater, and are also catalysts for back-end photocatalytic oxidation; then, the flocculated wastewater is sent to the flotation zone 2.1, and bubbles are generated by the reflux dissolved air unit 2.3 and sent to the flotation zone 2.1.1 to make impurities float on the surface of the wastewater, and the impurities on the surface of the wastewater are scraped off to the slag collection zone 2.1.2 by the scraping unit 2.2 to remove pollutants such as oil and suspended matter; finally, the wastewater after air flotation and the hydrogen peroxide prepared by the hydrogen peroxide preparation system 3 enter the photocatalytic oxidation system 4 for photocatalytic reaction to remove organic matter in the wastewater, so that the wastewater treatment efficiency is high and the treatment effect is better.

[0054] Based on the above solution, the box body 2.1 is fixedly mounted on the base 7, which has a higher integration and is more convenient to use.

[0055] Preferably, in this embodiment, the bottom of the clean water area 2.1.3 is connected to one end of the water outlet pipeline 2.1.9, and the other end of the water outlet pipeline 2.1.9 extends horizontally and is fixedly installed with a valve, which can be preferably a solenoid valve. During operation, the valve can be regularly activated to discharge the clean water in the clean water area 2.1.3.

[0056] Example 3

[0057] On the basis of Example 2, in this example, the electro-flocculation system 1 comprises a water supply pump 1.1 and an electrolysis unit 11.2, and both ends of the electrolysis unit 11.2 are connected to the outlet of the water supply pump 1.1 and the flotation zone 2.1.1 through pipelines, respectively.

[0058] During the treatment process, the sewage to be treated is sent to the electrolysis unit I through the water supply pump 1.1. On the one hand, the electrolysis unit I can achieve oilfield sewage demulsification through electric current, and on the other hand, the Fe ions generated by anode electrolysis help the flocculation of oilfield sewage and are also a catalyst for subsequent photocatalytic oxidation.

[0059] Preferably, in this embodiment, the electrolysis unit 11.2 comprises a plurality of electrolysis modules 1, which are sequentially connected in series through pipelines, and the electrolysis modules 1 at both ends are connected to the outlet of the water supply pump 1.1 and the flotation zone 2.1.1 through pipelines, respectively.

[0060] In addition, the inlet of the water supply pump 1.1 can be connected to the sewage supply equipment through a pipeline.

[0061] It should be noted that each of the above-mentioned electrolysis modules 1 is a tubular structure, which adopts the existing technology, and its anode is a Fe electrode. The specific structure and principle of each electrolysis module 1 will not be repeated here.

[0062] Preferably, in this embodiment, the electro-flocculation system 1 further comprises a mounting frame 1.3, the mounting frame 1.3 is fixedly mounted on one end of the box body 2.1, and the water supply pump 1.1 and the electrolysis unit 11.2 are respectively mounted on the mounting frame 1.3.

[0063] Example 4

[0064] On the basis of any one of Examples 2 to 3, in this embodiment, the hydrogen peroxide preparation system 3 includes a circulation pump 3.1 and an electrolysis unit II3.3, the inlet of the circulation pump 3.1 is connected to the clean water zone 2.1.3 through a pipeline, and the outlet thereof is connected to one end of the electrolysis unit II3.3 through a pipeline; the other end of the electrolysis unit II3.3 is connected to the flotation zone 2.1.1.

[0065] During the treatment process, the circulation pump 3.1 sends part of the clean water in the clean water area 2.1.3 to the electrolysis unit II3.3 for electrolysis to produce low-concentration hydrogen peroxide, and sends the low-concentration hydrogen peroxide together with the sewage in the flotation area 2.1.1 to the photocatalytic oxidation system for catalytic oxidation to remove organic matter in the sewage.

[0066] Preferably, in this embodiment, the electrolysis unit II3.3 comprises a plurality of electrolysis modules II, which are sequentially distributed in series through pipelines, and the electrolysis modules II at both ends are respectively connected to the outlet of the circulation pump 3.1 and two oxidant filling pipelines 2.1.7 connected to the upper part of the flotation zone 2.1.1 through pipelines.

[0067] It should be noted that each of the above-mentioned electrolysis modules 2 is a tubular structure, which adopts the existing technology, and the specific structure and principle of each electrolysis module 2 will not be repeated here.

[0068] In addition, the water is rich in oxygen after flotation, which is a necessary condition for the electrolytic preparation of hydrogen peroxide. The electrolysis unit II3.3 can electrolyze the oxygen-rich water to produce low-concentration hydrogen peroxide.

[0069] Preferably, in this embodiment, the hydrogen peroxide preparation system 3 further comprises a mounting bracket 3.3, the mounting bracket 3.3 is fixedly mounted on one end of the box body 2.1, and the circulation pump 3.1 and the electrolysis unit II 3.3 are respectively mounted on the mounting bracket 3.3.

[0070] Example 5

[0071] On the basis of Example 4, in this embodiment, the water collection pipeline group includes two water collection pipelines 2.1.8, the inlets of the two water collection pipelines 2.1.8 respectively extend to the lower part of the flotation zone 2.1.1, and the outlets thereof respectively extend to the outside of the upper part of the flotation zone 2.1.1; the upper part of the flotation zone 2.1.1 is connected to two oxidant filling pipelines 2.1.7, the other end of the electrolysis unit II3.3 is connected to the two oxidant filling pipelines 2.1.7, and the outlets of the two oxidant filling pipelines 2.1.7 respectively extend to the outside of the two sides of the upper part of the flotation zone 2.1.1; two overflow troughs 2.1.4 are installed on both sides of the box body 2.1 opposite to each other, and the two overflow troughs 2.1.4 are respectively located below the outlets of the two water collection pipelines 2.1.8 and the outlets of the two oxidant filling pipelines 2.1.7;

[0072] The photocatalytic oxidation system 4 includes two reaction tanks 4.2 and two guide plates 4.1. The two reaction tanks 4.2 are relatively installed on both sides of the box body 2.1 and are located below the two overflow tanks 2.1.4. The two guide plates 4.1 are relatively installed between the two overflow tanks 2.1.4 and the two reaction tanks 4.2.

[0073] During the treatment process, the circulation pump 3.1 sends part of the clean water in the clean water area 2.1.3 to the electrolysis unit II3.3 for electrolysis to produce low-concentration hydrogen peroxide, and the low-concentration hydrogen peroxide and the sewage in the flotation area 2.1.1 are overflowed into the two overflow tanks 2.1.4 through the two oxidant filling pipelines 2.1.7. At the same time, the sewage in the flotation area 2.1.1 is overflowed into the two overflow tanks 2.1.4 through the two water collection pipelines 2.1.8. The sewage in the two overflow tanks 2.1.4 flows through the two drainage plates 4.1 to the two reaction tanks 4.2 for oxidation catalytic reaction to remove organic matter in the sewage.

[0074] Example 6

[0075] On the basis of Example 5, in this embodiment, the box body 2.1 is a rectangular structure, and the two reaction tanks 4.2 are respectively rectangular tank structures.

[0076] The shapes of the box body 2.1 and the two reaction tanks 4.2 are reasonably designed, neat and beautiful.

[0077] Example 7

[0078] On the basis of any one of Examples 5 to 6, in this embodiment, the two reaction tanks 4.2 can move horizontally, and can be flipped up and down and positioned; one side of the two guide plates 4.1 is rotationally connected to one side of the two reaction tanks 4.2 through the pin II4.4, and the other side is rotationally connected to the box body 2.1 and can slide up and down.

[0079] The two reaction tanks 4.2 and the two drainage plates 4.1 can be unfolded separately for sewage treatment, and can also be folded to the two sides of the box body 2.1, which takes up little space and is convenient for transportation. In addition, an automated folding structure is adopted to meet road transportation requirements. After unfolding, the effective illumination area is increased by more than three times, which greatly improves the efficiency of the photocatalytic oxidation reaction and provides a guarantee for the water quality to meet the standards.

[0080] The two pin shafts II4.4 are respectively fixedly installed horizontally on one side of the two guide plates 4.1, and the two ends thereof are respectively rotatably connected to one side of the two reaction tanks 4.2.

[0081] Based on the above scheme, the base 7 is also fixedly installed with a lifting pump 6, the inlet of the lifting pump 6 is connected to the two reaction tanks 4.2 through pipelines, and the outlet is connected to the clean water area 2.1.3 through a lifting pipeline. During the treatment process, the sewage in the flotation area 2.1.1 overflows into the two reaction tanks 4.2 for catalytic oxidation reaction. After 10-20 minutes, the lifting pump 6 can be started to send the clean water in the two reaction tanks 4.2 to the clean water area 2.1.3.

[0082] In addition, when folding, all lifting pipelines can be disassembled first to prevent the lifting pipelines from affecting the folding of the two reaction tanks 4.2. When processing, the lifting pipelines can be installed and used.

[0083] Example 8

[0084] On the basis of Example 7, in this embodiment, a pair of slide plates 2.1.6 are relatively fixedly installed on both sides of the box body 2.1 corresponding to the two ends of the two overflow grooves 2.1.4, and each pair of the slide plates 2.1.6 is relatively provided with waist-shaped holes, and each waist-shaped hole extends in the vertical direction; a pin shaft I4.3 is horizontally fixedly installed on the other side of the two guide plates 4.1, and the two ends of the pin shaft I4.3 respectively extend into the corresponding two waist-shaped holes and are slidably connected.

[0085] The two ends of the other side of the two guide plates 4.1 are reasonably assembled with the two slide plates 2.1.6, which can ensure that the two guide plates 4.1 can be turned upside down and can move a suitable distance in the vertical direction, ensuring that the two guide plates 4.1 and the two reaction tanks 4.2 can be smoothly folded or unfolded and folded conveniently.

[0086] Example 9

[0087] On the basis of any one of Embodiments 7 to 8, in this embodiment, a pair of slide grooves 5.5 are relatively fixedly installed at the bottoms of both ends of the box body 2.1, and a slide rail body 5.3.3 is installed in each pair of the slide grooves 5.5 so as to slide horizontally, and the ends of the two slide rail bodies 5.3.3 that are away from each other are respectively rotatably connected to one end of the two reaction tanks 4.2, and the two slide rail bodies 5.3.3 are also rotatably connected to the two reaction tanks 4.2 through the liquid cylinder II5.4;

[0088] Liquid cylinders 15.1 are relatively fixedly installed on both sides of the box body 2.1, and the telescopic ends of the two liquid cylinders 15.1 extend vertically downward respectively, and are rotatably connected to the corresponding two slide rail bodies 5.3.3 through two connecting rods 5.2 respectively.

[0089] During the folding process, the two hydraulic cylinders I5.1 drive the two slide rail bodies 5.3.3 to slide horizontally through the two connecting rods 5.2, so that the four slide rail bodies 5.3.3 push the two reaction tanks 4.2 to move horizontally; at the same time, each slide rail body 5.3.3 can drive the corresponding reaction tank 4.2 to flip up and down through the corresponding hydraulic cylinder II5.4. The design is reasonable to ensure that the reaction tank can be folded smoothly and automatically.

[0090] Based on the above solution, since the two guide plates 4.1 can slide up and down along the holes on the slide plate 2.1.6 during the folding process, the two guide plates 4.1 can respectively drive the two reaction tanks 4.2 to move up and down.

[0091] Example 10

[0092] On the basis of Example 9, in this embodiment, the tail ends of the two liquid cylinders I5.1 are rotatably connected to the two ends of the box body 2.1 through the ear seats I2.1.5, and the tail ends of the two liquid cylinders II5.4 are rotatably connected to the two slide rail bodies 5.3.3 through the ear seats II5.3.1; the two slide rail bodies 5.3.3 are relatively fixedly installed with ear seats III5.3.2, and one end of the two connecting rods 5.2 is rotatably connected to the two ear seats III5.3.2.

[0093] The solution has a simple structure and a reasonable design. The two hydraulic cylinders I5.1 and the two hydraulic cylinders II5.4 are easy to assemble, ensuring the smooth operation of each component.

[0094] In addition, the above-mentioned hydraulic cylinder I5.1, connecting rod 5.2, slide rail assembly 5.3, hydraulic cylinder II5.4 and slide groove 5.5 constitute a folding system 5, and the slide rail assembly 5.3 includes an ear seat II5.3.1, an ear seat III5.3.2 and a slide rail body 5.3.3.

[0095] The working principle of the present invention is as follows:

[0096] 1) Oilfield wastewater first enters the electro-flocculation unit, where it breaks the emulsion under the action of electric current. At the same time, the Fe ions produced by anode electrolysis dissolve in the wastewater and react with it to form a flocculation reaction.

[0097] 2) The dissolved air system compresses and cuts the air into micro-nano bubbles, which are mixed with the sewage after flocculation reaction to achieve air flotation and remove pollutants such as oil and suspended matter;

[0098] 3) The wastewater after air flotation treatment enters the hydrogen peroxide preparation system to produce low-concentration hydrogen peroxide through electrolysis;

[0099] 4) The sewage containing hydrogen peroxide enters the photocatalytic oxidation reaction tank through the overflow tank. Due to the front-end electrocoagulation reaction, some low-valent Fe ions will still remain in the sewage. Under the condition of light, hydrogen peroxide and low-valent iron ions produce catalytic oxidation, completely degrading organic matter and killing bacteria, so as to achieve sewage treatment that meets the standards.

[0100] Based on the requirement of treating oil and gas field wastewater with high pollutants and complex systems without dropping to the ground, the present invention provides an integrated multifunctional oilfield wastewater treatment device, which has the following beneficial effects:

[0101] 1) The device integrates advanced water treatment processes such as electro-flocculation, gas flotation, and photocatalytic oxidation, and has good adaptability to complex oil and gas field wastewater;

[0102] 2) The whole process does not require the addition of water treatment chemicals, which is low in cost and easy to manage on site;

[0103] 3) It adopts an automated folding structure to meet road transportation requirements. After unfolding, the effective illumination area is increased by more than three times, which greatly improves the efficiency of the photocatalytic oxidation reaction and provides a guarantee for water quality to meet standards.

[0104] It should be noted that all electronic components involved in the present invention adopt the existing technology, and the above-mentioned components are electrically connected to the controller, and the control circuit between the controller and each component is the existing technology.

[0105] It will be apparent to those skilled in the art that the 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 features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0106] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated multifunctional oilfield wastewater treatment device, characterized in that: The invention comprises an electro-flocculation system (1), an air flotation system (2), a hydrogen peroxide preparation system (3) and a photocatalytic oxidation system (4); the electro-flocculation system (1), the air flotation system (2) and the photocatalytic oxidation system (4) are connected in sequence through pipelines; and the hydrogen peroxide preparation system (3) is connected to the air flotation system (2) through pipelines.

2. The integrated multifunctional oilfield wastewater treatment device according to claim 1 is characterized in that: The air flotation system (2) comprises a housing (2.1), a scraping unit (2.2) and a reflux dissolved air unit (2.3); the space inside the housing (2.1) is divided into a flotation zone (2.1.1), a slag collection zone (2.1.2) and a clean water zone (2.1.3) in sequence by two vertically arranged partitions; a water collection pipeline group is installed in the flotation zone (2.1.1), and the water collection pipeline group is connected to the photocatalytic oxidation system (4) through a pipeline; the scraping unit (2.2) is installed on the top of the housing (2.1), and its two ends extend to the flotation zone (2.1.1) and the slag collection zone (2.1.2) respectively; The electric flocculation system (1) is connected to the flotation zone (2.1.1) via a pipeline; one end of the reflux dissolved gas unit (2.3) is connected to the clean water zone (2.1.3) via a pipeline, and the other end is connected to the pipeline connecting the electric flocculation system (1) and the flotation zone (2.1.1) via a pipeline; the hydrogen peroxide preparation system (3) is connected to the flotation zone (2.1.1) via a pipeline.

3. The integrated multifunctional oilfield wastewater treatment device according to claim 2 is characterized in that: The electroflocculation system (1) comprises a water supply pump (1.1) and an electrolysis unit I (1.2), and two ends of the electrolysis unit I (1.2) are respectively connected to the outlet of the water supply pump (1.1) and the flotation zone (2.1.1) through pipelines.

4. The integrated multifunctional oilfield wastewater treatment device according to claim 2 is characterized in that: The hydrogen peroxide preparation system (3) comprises a circulation pump (3.1) and an electrolysis unit II (3.3); the inlet of the circulation pump (3.1) is connected to the clean water zone (2.1.3) through a pipeline, and the outlet of the circulation pump (3.1) is connected to one end of the electrolysis unit II (3.3) through a pipeline; the other end of the electrolysis unit II (3.3) is connected to the flotation zone (2.1.1).

5. The integrated multifunctional oilfield wastewater treatment device according to claim 4 is characterized in that: The water collection pipeline group includes two water collection pipelines (2.1.8), the inlets of the two water collection pipelines (2.1.8) respectively extend to the lower part of the flotation zone (2.1.1), and the outlets thereof respectively extend to the outside of the upper part of the flotation zone (2.1.1); the upper part of the flotation zone (2.1.1) is connected to two oxidant filling pipelines (2.1.7), the other end of the electrolysis unit II (3.3) is connected to the two oxidant filling pipelines (2.1.7), and the outlets of the two oxidant filling pipelines (2.1.7) respectively extend to the outside of both sides of the upper part of the flotation zone (2.1.1); two overflow troughs (2.1.4) are installed on both sides of the box body (2.1) opposite to each other, and the two overflow troughs (2.1.4) are respectively located below the outlets of the two water collection pipelines (2.1.8) and the outlets of the two oxidant filling pipelines (2.1.7); The photocatalytic oxidation system (4) comprises two reaction tanks (4.2) and two guide plates (4.1); the two reaction tanks (4.2) are relatively installed on both sides of the box body (2.1) and are located below the two overflow tanks (2.1.4); and the two guide plates (4.1) are relatively installed between the two overflow tanks (2.1.4) and the two reaction tanks (4.2).

6. The integrated multifunctional oilfield wastewater treatment device according to claim 5 is characterized in that: The box body (2.1) is a rectangular structure, and the two reaction tanks (4.2) are respectively rectangular tank structures.

7. The integrated multifunctional oilfield wastewater treatment device according to claim 5 is characterized in that: The two reaction grooves (4.2) can move horizontally, and can be turned upside down and positioned; one side of the two guide plates (4.1) is rotatably connected to one side of the two reaction grooves (4.2) through a pin II (4.4), and the other side is rotatably connected to the box body (2.1) and can slide up and down.

8. The integrated multifunctional oilfield wastewater treatment device according to claim 7 is characterized in that: A pair of slide plates (2.1.6) are relatively fixedly installed on both sides of the box body (2.1) at the positions corresponding to the two ends of the two overflow grooves (2.1.4), and each pair of the slide plates (2.1.6) is relatively provided with waist-shaped holes, and each waist-shaped hole extends in the vertical direction; a pin shaft I (4.3) is horizontally fixedly installed on the other side of the two guide plates (4.1), and the two ends of the pin shaft I (4.3) respectively extend into the corresponding two waist-shaped holes and are slidably connected.

9. The integrated multifunctional oilfield wastewater treatment device according to claim 7 is characterized in that: A pair of slide grooves (5.5) are relatively fixedly installed at the bottom of both ends of the box body (2.1), and a slide rail body (5.3.3) is installed in each pair of the slide grooves (5.5) for horizontal sliding. The ends of the two slide rail bodies (5.3.3) that are away from each other are rotatably connected to one end of the two reaction grooves (4.2), and the two slide rail bodies (5.3.3) are also rotatably connected to the two reaction grooves (4.2) through the liquid cylinder II (5.4); Liquid cylinders I (5.1) are relatively fixedly installed on both sides of the box body (2.1), and the telescopic ends of the two liquid cylinders I (5.1) respectively extend vertically downward and are rotationally connected to the corresponding two slide rail bodies (5.3.3) through two connecting rods (5.2).

10. The integrated multifunctional oilfield wastewater treatment device according to claim 9 is characterized in that: The tail ends of the two liquid cylinders I (5.1) are rotatably connected to the two ends of the box body (2.1) through ear seats I (2.1.5), and the tail ends of the two liquid cylinders II (5.4) are rotatably connected to the two slide rail bodies (5.3.3) through ear seats II (5.3.1); ear seats III (5.3.2) are relatively fixedly installed on the two slide rail bodies (5.3.3), and one end of the two connecting rods (5.2) is rotatably connected to the two ear seats III (5.3.2).

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