An integrated device for treating black and odorous shale gas flowback fluid

Abstract

This invention provides an integrated device for treating black and odorous shale gas backflow liquid, belonging to the field of wastewater treatment technology. The device includes a main body comprising: an air flotation slag removal chamber, a coagulation sedimentation chamber, an ozone oxidation chamber, a regulating chamber, a Fenton oxidation separation chamber, an anaerobic chamber, an aeration chamber, and a waste gas treatment chamber. The waste gas treatment chamber is located at the top of the main body, and the air flotation slag removal chamber, coagulation sedimentation chamber, ozone oxidation chamber, regulating chamber, Fenton oxidation separation chamber, anaerobic chamber, and aeration chamber are sequentially arranged below it. This integrated device offers excellent backflow liquid treatment performance; its integrated design facilitates management; and it effectively addresses the black and odorous problems of backflow liquid while solving the problems of complex processes and high costs associated with traditional black and odorous shale gas backflow liquid treatment methods, offering a simpler and more cost-effective approach.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to an integrated device for treating black and odorous shale gas backflow liquid. Background Technology

[0002] Shale gas has attracted widespread attention due to its high efficiency, cleanliness, and large recoverable reserves. While shale gas development shows promise, its extraction is extremely difficult, requiring artificial formation modification through hydraulic fracturing to increase reservoir permeability and achieve stable and increased production. The development process employs horizontal well fracturing in stages, resulting in high water consumption. Approximately 40%–60% of the fracturing fluid is returned to the surface after fracturing, forming flowback fluid. This flowback fluid is highly stable, has a high pollution coefficient, and is extremely difficult to treat. If stored long-term, a layer of oil floating on its surface hinders water reoxygenation. The oxygen consumption rate of organic matter in the water during oxidation and decomposition significantly exceeds the reoxygenation rate. Consequently, anaerobic microorganisms in the water produce malodorous pollutants such as hydrogen sulfide, methane, or ammonia during decomposition, causing the water to turn black and smelly.

[0003] Currently, the main measures for treating shale gas flowback fluid include pretreatment, oxidation, and desalination. However, conventional treatment methods cannot completely remove suspended solids and organic compounds from the black and odorous flowback fluid. Resource-based treatment of the flowback fluid is a key factor in achieving sustainable development of shale gas. There is an urgent need to invent an integrated device for treating black and odorous shale gas flowback fluid to solve problems such as the fluid turning black and smelly and having excessive organic compound content. Chinese patent (202210635644.2) discloses a method and system for treating black and odorous shale gas flowback fluid, but this invention patent suffers from drawbacks such as complex device structures and high treatment costs. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated device for treating black and odorous shale gas runoff liquid, which solves the problems of complex process and high cost in runoff liquid treatment methods, and has a good treatment effect on runoff liquid; the integrated design facilitates management; and it can effectively treat the black and odorous problems of runoff liquid.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An integrated device for treating black and odorous shale gas backflow liquid is characterized by comprising a main body, which includes: an air flotation slag removal chamber, a coagulation sedimentation chamber, an ozone oxidation chamber, a regulating chamber, a Fenton oxidation separation chamber, an anaerobic chamber, an aeration chamber, and a waste gas treatment chamber.

[0007] The waste gas treatment chamber is located at the top of the main body of the device, and the flotation slag removal chamber, coagulation sedimentation chamber, ozone oxidation chamber, regulating chamber, Fenton oxidation separation chamber, anaerobic chamber, and aeration chamber are sequentially located below the waste gas treatment chamber.

[0008] Furthermore, the air flotation slag removal chamber includes: an inlet pipe, an air flotation disc, a water distribution pipe, a first air collection pipe, an air flotation blower, an overflow weir, a slag scraper, and a slag trough.

[0009] The inlet pipe is located inside the air flotation slag removal chamber. The air flotation disc is located in the lower middle part of the air flotation slag removal chamber. The air flotation disc is a microporous aeration disc with uniform micropores. The water distribution pipe is located on the top of the air flotation disc and is connected to the inlet pipe. The water distribution pipe is provided with a horizontal radial outlet. The top plate of the air flotation slag removal chamber is convex. The first air collecting pipe is located at the convex part of the top plate of the air flotation slag removal chamber. The air flotation blower is located outside the air flotation slag removal chamber and is connected to the air flotation disc through a pipe. The overflow weir is located in the upper part of the air flotation slag removal chamber. The slag scraper is located inside the air flotation slag removal chamber and is arranged parallel to the overflow weir. The slag trough is located below the overflow weir.

[0010] Furthermore, two inclined top plates for the coagulation sedimentation chamber are provided between the coagulation sedimentation chamber and the air flotation slag removal chamber. The two inclined top plates for the coagulation sedimentation chamber are arranged opposite each other on the chamber wall, and the angle between the two inclined top plates for the coagulation sedimentation chamber and the chamber wall is 75°. The coagulation sedimentation chamber includes: a coagulation stirring zone and a coagulation sedimentation zone. The coagulation stirring zone includes: a coagulant addition meter and a coagulation agitator. The coagulation sedimentation zone includes: a baffle plate for the coagulation sedimentation zone and a discharge valve for the coagulation sedimentation chamber.

[0011] The coagulant addition meter is located outside the coagulation mixing zone and is connected to the interior of the coagulation mixing zone via a pipe. The coagulation mixer is located inside the coagulation mixing zone. The coagulation mixing zone has an inclined bottom plate. The coagulation sedimentation zone baffle is located between the coagulation mixing zone and the coagulation sedimentation zone. The coagulation sedimentation zone baffle is inclined at 45° towards the coagulation mixing zone. The bottom of the coagulation sedimentation zone has a conical structure, and the coagulation sedimentation chamber discharge valve is located at the bottom of the conical structure.

[0012] Furthermore, the ozone oxidation chamber includes: a first partition, a second gas collection pipe, and an ozone aeration system.

[0013] The first partition is disposed between the ozone oxidation chamber and the coagulation sedimentation chamber. The top plate of the ozone oxidation chamber is convex. The second gas collection pipe is disposed at the convex part of the top plate of the ozone oxidation chamber. The ozone aeration system includes: an ozone aeration pipe and an ozone generator. The ozone generator is disposed outside the ozone oxidation chamber and is connected to the inside of the ozone oxidation chamber through the ozone aeration pipe.

[0014] Furthermore, the regulating chamber includes: an acid-base controller and a regulating chamber stirrer.

[0015] The acid-base controller includes: a pH value measuring probe and an acid metering and adding device. The acid metering and adding device is located outside the regulating chamber. The pH value measuring probe is embedded in the inner wall of the regulating chamber. The acid-base controller regulates the pH value of the wastewater to 3. The regulating chamber agitator is located inside the regulating chamber. The bottom of the regulating chamber is provided with an inclined regulating chamber bottom plate.

[0016] Furthermore, the Fenton oxidation separation chamber includes: a Fenton oxidation stirring zone and a Fenton oxidation precipitation zone. The Fenton oxidation stirring zone includes: a Fenton oxidant addition meter and a Fenton oxidation stirrer. The Fenton oxidation precipitation zone includes: a Fenton oxidation precipitation zone baffle and a Fenton oxidation separation chamber discharge valve.

[0017] The Fenton oxidant addition meter is located outside the Fenton oxidation stirring zone and is connected to the inside of the Fenton oxidation stirring zone via a pipe. The Fenton oxidation stirrer is located inside the Fenton oxidation stirring zone. The bottom of the Fenton oxidation stirring zone is provided with an inclined Fenton oxidation stirring zone bottom plate. The Fenton oxidation sedimentation zone baffle is located between the Fenton oxidation stirring zone and the Fenton oxidation sedimentation zone, and the Fenton oxidation sedimentation zone baffle is inclined at 45° towards the Fenton oxidation stirring zone. The bottom of the Fenton oxidation sedimentation zone has a conical structure, and the Fenton oxidation separation chamber discharge valve is located at the bottom of the conical structure.

[0018] Furthermore, the anaerobic chamber includes: a second partition, a water inlet, an anaerobic stirrer, a third gas collecting pipe, and an anaerobic chamber discharge valve; the second partition is disposed between the anaerobic chamber and the Fenton oxidation separation chamber, the water inlet is disposed on the second partition, the anaerobic chamber has an inclined anaerobic chamber bottom plate, the anaerobic stirrer is disposed at the bottom of the anaerobic chamber, the top plate of the anaerobic chamber is convex, the third gas collecting pipe is disposed at the convex part of the top plate of the anaerobic chamber, the bottom of the anaerobic chamber has a conical structure, and the anaerobic chamber discharge valve is disposed at the bottom of the conical structure.

[0019] Furthermore, the aeration chamber includes: a third partition, a fourth gas collecting pipe, an oxidation disc, an oxidation blower, an inspection window, and an overflow weir; the third partition is disposed between the aeration chamber and the anaerobic chamber, the top plate of the aeration chamber is convex, the fourth gas collecting pipe is disposed at the convex part of the top plate of the aeration chamber, the oxidation disc is disposed in the lower middle part of the aeration chamber, the oxidation disc is a microporous aeration disc with uniform micropores, the oxidation blower is disposed outside the aeration chamber, the oxidation blower is connected to the oxidation disc through a pipe, the inspection window is disposed on the upper side of the aeration chamber, and the overflow weir is disposed at the bottom of the inspection window.

[0020] Furthermore, the exhaust gas treatment chamber includes: an exhaust gas acidification absorption zone, an exhaust gas alkalization absorption zone, and a demister; the exhaust gas acidification absorption zone is located at the bottom of the exhaust gas treatment chamber, the demister is located at the top of the exhaust gas treatment chamber, the exhaust gas alkalization absorption zone is located between the exhaust gas acidification absorption zone and the demister, and the demister is a baffle plate demister.

[0021] The waste gas acidification absorption zone is equipped with a waste gas acidification absorption assembly, which includes: an acidic solution spraying device, an acidic solution storage tank, an acidic solution circulation pump, and an acid addition device. The waste gas alkalization absorption zone is equipped with a waste gas alkalization absorption assembly, which includes: an alkaline solution spraying device, an alkaline solution storage tank, an alkaline solution circulation pump, and an alkali addition device. The acidic solution spraying device is located inside the waste gas acidification absorption zone, and the acidic solution storage tank is located at the bottom of the acidic solution spraying device. The acidic solution circulation pump is connected to the acidic solution spraying device and the acidic solution storage tank via pipes. The acid addition device includes an acid tank and a stirring device. The acid tank is connected to... The acidic solution circulating pump is connected, the alkaline solution spraying device is located inside the waste gas alkalization absorption zone, the alkaline solution storage tank is located at the bottom of the alkaline solution spraying device, the alkaline solution circulating pump is connected to the alkaline solution spraying device and the alkaline solution storage tank through pipes, the alkali addition device includes an alkali tank and a stirring device, the alkali tank is connected to the alkaline solution circulating pump through pipes and valves, the acidic solution spraying device and the alkaline solution spraying device are spiral spraying devices, the air inlet is located at the bottom of the waste gas treatment chamber, the top of the waste gas treatment chamber is a conical structure, the waste gas outlet is located at the top of the conical structure, and the spray water collection device is located inside the waste gas acidification absorption zone and the waste gas alkalization absorption zone.

[0022] Furthermore, the integrated device for treating black and odorous shale gas backflow liquid also includes rollers, which are disposed at the bottom of the main body of the device;

[0023] The coagulant added by the coagulant metering device is a polyferric sulfate solution; the acid added by the acid metering device is waste hydrochloric acid or waste sulfuric acid; the Fenton oxidant added by the Fenton oxidant metering device is hydrogen peroxide solution and iron-carbon agent; the acidic solution of the waste gas acidification absorption component is dilute hydrochloric acid; and the alkaline solution of the waste gas alkalization absorption component is sodium hydroxide solution or lime water.

[0024] Advantages of this invention:

[0025] This device is an integrated unit that provides excellent treatment for backflow fluid. Its integrated design facilitates management. This device can effectively address the black and odorous issues of backflow fluid, while also solving the problems of complex processes and high costs associated with treating black and odorous shale gas backflow fluid. The treatment process is simple and the cost is low. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the air flotation slag removal chamber and the coagulation sedimentation chamber of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the ozone oxidation chamber, the conditioning chamber, and the Fenton oxidation separation chamber of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the anaerobic chamber and aeration chamber of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of the waste gas treatment chamber of the present invention;

[0031] In the diagram: 1. Air flotation slag removal chamber, 101. Water inlet pipe, 102. Air flotation disc, 103. Water distribution pipe, 104. First air collection pipe, 105. Air flotation blower, 106. Slag overflow weir, 107. Slag scraper, 108. Slag trough.

[0032] 2. Coagulation sedimentation chamber; 201. Inclined top plate of coagulation sedimentation chamber; 202. Coagulation mixing zone; 203. Coagulation sedimentation zone; 204. Coagulant addition meter; 205. Coagulation agitator; 206. Baffle plate of coagulation sedimentation zone; 207. Discharge valve of coagulation sedimentation chamber.

[0033] 3. Ozone oxidation chamber, 301. First partition, 302. Second gas collection pipe, 303. Ozone aeration system;

[0034] 4. Regulating chamber; 401. Acid-base tester; 402. Regulating chamber stirrer;

[0035] 5. Fenton oxidation separation chamber; 501. Fenton oxidation stirring zone; 502. Fenton oxidation sedimentation zone; 503. Fenton oxidant addition meter; 504. Fenton oxidation stirrer; 505. Fenton oxidation sedimentation zone baffle; 506. Fenton oxidation separation chamber discharge valve.

[0036] 6. Anaerobic chamber; 601. Second partition; 602. Water outlet; 603. Anaerobic agitator; 604. Third gas collection pipe; 605. Anaerobic chamber discharge valve.

[0037] 7. Aeration chamber; 701. Third partition; 702. Fourth gas collection pipe; 703. Oxidation disc; 704. Oxidation blower; 705. Inspection window; 706. Overflow weir.

[0038] 8. Waste gas treatment chamber; 801. Waste gas acidification absorption zone; 802. Waste gas alkalization absorption zone; 803. Demister; 804. Acidic solution spraying device; 805. Acidic solution storage tank; 806. Acidic solution circulation pump; 807. Alkaline solution spraying device; 808. Alkaline solution storage tank; 809. Alkaline solution circulation pump; 810. Acid addition device; 811. Alkali addition device; 812. Air inlet; 813. Waste gas outlet; 814. Spray water collection device.

[0039] 9. Rollers. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0041] like Figure 1 As shown, an integrated device for treating black and odorous shale gas backflow liquid includes a main body, which comprises: an air flotation slag removal chamber 1, a coagulation sedimentation chamber 2, an ozone oxidation chamber 3, a regulating chamber 4, a Fenton oxidation separation chamber 5, an anaerobic chamber 6, an aeration chamber 7, a waste gas treatment chamber 8, and rollers 9.

[0042] The waste gas treatment chamber 8 is located at the top of the main body of the device. The flotation slag removal chamber 1, coagulation sedimentation chamber 2, ozone oxidation chamber 3, regulating chamber 4, Fenton oxidation separation chamber 5, anaerobic chamber 6, and aeration chamber 7 are sequentially located below the waste gas treatment chamber 8. The roller 9 is located at the bottom of the main body of the device.

[0043] like Figure 2 As shown, the flotation slag removal chamber 1 includes: an inlet pipe 101, a flotation disc 102, a water distribution pipe 103, a first air collection pipe 104, a flotation blower 105, an overflow weir 106, a slag scraper 107, and a slag trough 108.

[0044] The inlet pipe 101 is located inside the air flotation sludge removal chamber 1. The air flotation disk 102 is located in the lower middle part of the air flotation sludge removal chamber 1. The air flotation disk 102 is a microporous aeration disk with uniform micropores. The water distribution pipe 103 is located on the top of the air flotation disk 102. The water distribution pipe 103 is connected to the inlet pipe 101. The water distribution pipe 103 is provided with a horizontal radial water outlet. In order to improve the sewage treatment effect, the water distribution pipe 103 is configured in a concentric circle shape or a cross shape.

[0045] The top plate of the air flotation sludge removal chamber 1 is convex. The first air collecting pipe 104 is located at the convex part of the top plate of the air flotation sludge removal chamber 1. The air flotation blower 105 is located outside the air flotation sludge removal chamber 1 and is connected to the air flotation disc 102 through a pipe. The overflow weir 106 is located at the upper part of the air flotation sludge removal chamber 1. The sludge scraper 107 is located inside the air flotation sludge removal chamber 1 and is arranged parallel to the overflow weir 106. The sludge trough 108 is located below the overflow weir 106. The air flotation sludge removal chamber 1 can remove suspended solids in wastewater with a density less than or equal to that of water by air flotation.

[0046] In a preferred embodiment of the present invention, two inclined top plates 201 are provided between the coagulation sedimentation chamber 2 and the air flotation slag removal chamber 1. The two inclined top plates 201 are arranged opposite to each other on the chamber wall, and the angle between the two inclined top plates 201 and the chamber wall is 75°. The two inclined top plates 201 serve as an isolation to prevent the water flow between the coagulation sedimentation chamber 2 and the air flotation slag removal chamber 1 from interfering with each other.

[0047] The coagulation and sedimentation chamber 2 includes: a coagulation stirring zone 202 and a coagulation and sedimentation zone 203. The coagulation stirring zone 202 includes: a coagulant addition metering device 204 and a coagulation agitator 205. The coagulation and sedimentation zone 203 includes: a coagulation and sedimentation zone baffle 206 and a coagulation and sedimentation chamber discharge valve 207.

[0048] The coagulant addition meter 204 is located outside the coagulation mixing zone 202 and is connected to the inside of the coagulation mixing zone 202 via a pipe. The coagulation agitator 205 is located inside the coagulation mixing zone 202. The coagulation mixing zone 202 is provided with an inclined coagulation mixing zone bottom plate. The water after coagulation and mixing flows into the lower middle part of the coagulation sedimentation zone 203 along the inclined coagulation mixing zone bottom plate.

[0049] The baffle plate 206 of the coagulation and sedimentation zone is disposed between the coagulation and stirring zone 202 and the coagulation and sedimentation zone 203. The baffle plate 206 of the coagulation and sedimentation zone is inclined at 45° toward the coagulation and stirring zone 202. The bottom of the coagulation and sedimentation zone 203 is a conical structure. The discharge valve 207 of the coagulation and sedimentation chamber is disposed at the bottom of the conical structure.

[0050] like Figure 3 As shown, the ozone oxidation chamber 3 includes: a first partition 301, a second gas collection pipe 302, and an ozone aeration system 303.

[0051] The first partition 301 is disposed between the ozone oxidation chamber 3 and the coagulation sedimentation chamber 2, and the first partition 301 and the inner wall of the device form a water flow channel for wastewater to enter the ozone oxidation chamber 3. The top plate of the ozone oxidation chamber 3 is convex, and the second gas collection pipe 302 is disposed at the convex part of the top plate of the ozone oxidation chamber 3. The ozone aeration system 303 includes: an ozone aeration pipe and an ozone generator. The ozone generator is disposed outside the ozone oxidation chamber 3, and the ozone generator is connected to the inside of the ozone oxidation chamber 3 through the ozone aeration pipe.

[0052] As a preferred embodiment of the present invention, such as Figure 3 As shown, the regulating chamber 4 includes: an acid-base controller 401 and a regulating chamber stirrer 402.

[0053] The acid-base controller 401 includes: a pH value measuring probe and an acid metering adder. The acid metering adder is located outside the regulating chamber 4. The pH value measuring probe is embedded in the inner wall of the regulating chamber 4. The acid-base controller 401 regulates the pH value of the wastewater to 3. The regulating chamber stirrer 402 is located inside the regulating chamber 4. The bottom of the regulating chamber 4 is provided with an inclined regulating chamber bottom plate.

[0054] As a preferred embodiment of the present invention, such as Figure 3As shown, the Fenton oxidation separation chamber 5 includes: a Fenton oxidation stirring zone 501 and a Fenton oxidation sedimentation zone 502. The Fenton oxidation stirring zone 501 includes: a Fenton oxidant addition metering device 503 and a Fenton oxidation stirrer 504. The Fenton oxidation sedimentation zone 502 includes: a Fenton oxidation sedimentation zone baffle 505 and a Fenton oxidation separation chamber discharge valve 506.

[0055] The Fenton oxidant addition meter 503 is located outside the Fenton oxidation stirring zone 501. The Fenton oxidant addition meter 503 is connected to the inside of the Fenton oxidation stirring zone 501 through a pipe. The Fenton oxidation stirrer 504 is located inside the Fenton oxidation stirring zone 501. The bottom of the Fenton oxidation stirring zone 501 is provided with an inclined Fenton oxidation stirring zone bottom plate. The stirred water flows into the lower middle part of the Fenton oxidation sedimentation zone 502 along the inclined Fenton oxidation stirring zone bottom plate.

[0056] The Fenton oxidation precipitation zone baffle 505 is disposed between the Fenton oxidation stirring zone 501 and the Fenton oxidation precipitation zone 502. The Fenton oxidation precipitation zone baffle 505 is inclined at 45° toward the Fenton oxidation stirring zone 501. The bottom of the Fenton oxidation precipitation zone 502 is a conical structure. The Fenton oxidation separation chamber discharge valve 506 is disposed at the bottom of the conical structure.

[0057] like Figure 4 As shown, the anaerobic chamber 6 includes: a second partition 601, a water inlet 602, an anaerobic stirrer 603, a third gas collecting pipe 604, and an anaerobic chamber discharge valve 605. The second partition 601 is disposed between the anaerobic chamber 6 and the Fenton oxidation separation chamber 5, and the water inlet 602 is disposed on the second partition 601. The anaerobic chamber 6 has an inclined bottom plate to facilitate the sedimentation and collection of solids. The anaerobic stirrer 603 is disposed at the bottom of the anaerobic chamber 6 to promote the growth and reproduction of anaerobic bacteria. The top plate of the anaerobic chamber 6 is convex, and the third gas collecting pipe 604 is disposed at the convex part of the top plate of the anaerobic chamber 6. The bottom of the anaerobic chamber 6 has a conical structure, and the anaerobic chamber discharge valve 605 is disposed at the bottom of the conical structure.

[0058] As a preferred embodiment of the present invention, such as Figure 4As shown, the aeration chamber 7 includes: a third partition 701, a fourth gas collection pipe 702, an oxidation plate 703, an oxidation blower 704, an inspection window 705, and an overflow weir 706; the third partition 701 is disposed between the aeration chamber 7 and the anaerobic chamber 6, and the third partition 701 and the inner wall of the device form a water flow channel for wastewater to enter the aeration chamber 7.

[0059] The top plate of the aeration chamber 7 is convex, the fourth air collecting pipe 702 is located at the convex part of the top plate of the aeration chamber 7, the oxidation disc 703 is located in the middle and lower part of the aeration chamber 7, the oxidation disc 703 is a microporous aeration disc with uniform micropores, the oxidation blower 704 is located outside the aeration chamber 7, the oxidation blower 704 is connected to the oxidation disc 703 through a pipe, the inspection window 705 is located on the upper side of the aeration chamber 7, and the overflow weir 706 is located at the bottom of the inspection window 705.

[0060] The gas collected by the gas collection pipes in the ozone oxidation chamber 3 and aeration chamber 7 is sent to the flotation slag removal chamber 8, and the waste gas collected in the flotation slag removal chamber 1 and anaerobic chamber 6 enters the waste gas treatment chamber 8 for treatment.

[0061] like Figure 5 As shown, the exhaust gas treatment chamber 8 includes: an exhaust gas acidification absorption zone 801, an exhaust gas alkalization absorption zone 802, and a demister 803; the exhaust gas acidification absorption zone 801 is located at the bottom of the exhaust gas treatment chamber 8, the demister 803 is located at the top of the exhaust gas treatment chamber 8, the exhaust gas alkalization absorption zone 802 is located between the exhaust gas acidification absorption zone 801 and the demister 803, and the demister 803 is a baffle plate demister.

[0062] The demister 803 collects large droplets in the exhaust gas and returns them to the source, reducing the moisture content in the exhaust gas. Its working principle is that the exhaust gas enters the demister 803, passes through a series of bends, and is discharged from the top. Due to its mass and kinetic energy, the water droplets fall straight down when passing through the bends, impact the surface of the demister 803, and bounce back under the action of gravity.

[0063] The waste gas acidification absorption zone 801 is equipped with a waste gas acidification absorption component, which includes: an acidic solution spraying device 804, an acidic solution storage tank 805, an acidic solution circulation pump 806, and an acid addition device 810. The waste gas alkalization absorption zone 802 is equipped with a waste gas alkalization absorption component, which includes: an alkaline solution spraying device 807, an alkaline solution storage tank 808, an alkaline solution circulation pump 809, and an alkali addition device 811.

[0064] The acidic solution spraying device 804 is installed inside the waste gas acidification absorption zone 801. The acidic solution storage tank 805 is installed at the bottom of the acidic solution spraying device 804. The acidic solution circulation pump 806 is connected to the acidic solution spraying device 804 and the acidic solution storage tank 805 via pipes. The acid adding device 810 includes an acid tank and a stirring device. The acid tank is connected to the acidic solution circulation pump 806 via pipes and valves. The alkaline solution spraying device 807... The alkaline solution storage tank 808 is located inside the waste gas alkalization absorption zone 802, and is located at the bottom of the alkaline solution spraying device 807. The alkaline solution circulation pump 809 is connected to the alkaline solution spraying device 807 and the alkaline solution storage tank 808 through a pipe. The alkali addition device 811 includes an alkali tank and a stirring device. The alkali tank is connected to the alkaline solution circulation pump 809 through a pipe and a valve. The concentration of the absorption solution is determined according to the amount and concentration of waste gas to be treated.

[0065] The acidic solution spraying device 804 and the alkaline solution spraying device 807 are spiral spraying devices. The sprayed water is in the form of mist, and the water mist crosses and merges with each other, leaving no dead corners. This is conducive to expanding the contact area between the waste gas and the solution, and improving the absorption rate and absorption effect.

[0066] An air inlet 812 is located at the bottom of the exhaust gas treatment chamber 8, the top of the exhaust gas treatment chamber 8 is a conical structure, an exhaust gas outlet 813 is located at the top of the conical structure, and a spray water collection device 814 is located inside the exhaust gas acidification absorption zone 801 and the exhaust gas alkalization absorption zone 802.

[0067] In a preferred embodiment of the present invention, the coagulant in the coagulant metering device 204 is a polyferric sulfate solution, the acid in the acid metering device is waste hydrochloric acid or waste sulfuric acid, the Fenton oxidant in the Fenton oxidant metering device 503 is a hydrogen peroxide solution and an iron-carbon agent, the acidic solution in the waste gas acidification absorption component is dilute hydrochloric acid, and the alkaline solution in the waste gas alkalization absorption component is a sodium hydroxide solution or lime water.

[0068] The preparation process of the iron-carbon agent is as follows: 1. Rinse the activated carbon repeatedly with deionized water until there is no turbidity; 2. Soak in distilled water for 12-24 hours; 3. Dry at 105-110℃ for 12-24 hours; 4. Immerse the dried activated carbon in a ferrous sulfate solution for 2-12 hours; 5. Filter and dry at 105-110℃ for 12-24 hours; 6. Transfer to a muffle furnace and calcine at 400-550℃ for 4-12 hours to obtain the desired iron-carbon agent.

[0069] The specific steps of water treatment performed by the device are as follows:

[0070] 1. The black and odorous shale gas backflow liquid enters the air flotation and sludge removal chamber 1 through the inlet pipe 101. The air flotation plate 102, located below the water distribution pipe 103, generates a large number of fine bubbles. The bubbles and suspended solids adhere to form scum, which rises to the water surface under buoyancy. The scum is discharged through the scraper plate 107 and the scum trough 108. The air flotation and sludge removal chamber 1 removes suspended pollutants in the wastewater with a density less than or equal to that of water.

[0071] 2. Water enters the coagulation mixing zone 202 through the gap between the inclined top plates 201 of the coagulation sedimentation chamber. Coagulant is added by the coagulant metering device 204, and the coagulation agitator 205 stirs the water, causing a coagulation reaction. The solids sink to the lower part of the coagulation sedimentation zone 203 under the action of gravity and are discharged through the coagulation sedimentation chamber discharge valve 207 at the bottom.

[0072] 3. After coagulation and sedimentation separation, the wastewater enters the ozone oxidation chamber 3 through the water flow channel between the coagulation sedimentation chamber 2 and the ozone oxidation chamber 3. The ozone aeration system 303, located at the bottom of the ozone oxidation chamber, stirs the water and oxidizes the wastewater. Excess ozone is collected in the flotation sludge removal chamber 1 through the second gas collection pipe 302 at the top of the ozone oxidation chamber.

[0073] 4. Wastewater enters the regulating chamber 4, where waste hydrochloric acid or waste sulfuric acid is added by the acid metering additive. The regulating chamber stirrer 402 stirs and mixes the water to adjust the pH value of the wastewater to 2-4.

[0074] 5. Wastewater enters the Fenton oxidation separation chamber 5. The Fenton oxidant metering device 503 adds hydrogen peroxide solution and iron-carbon agent. The Fenton oxidation agitator 504 mixes the water. The active sites on the surface of the iron-carbon agent catalyze the decomposition of hydrogen peroxide to produce •OH. •OH has strong oxidizing properties, thus oxidizing and decomposing the pollutants in the wastewater. The oxidized and decomposed wastewater enters the Fenton oxidation sedimentation zone 502. Solids settle to the bottom of the Fenton oxidation sedimentation zone 502 under gravity and are discharged through the Fenton oxidation separation chamber discharge valve 506 at the bottom. The discharged iron-carbon agent is dehydrated, dried, regenerated, and recycled.

[0075] 6. The wastewater after Fenton oxidation separation enters the anaerobic chamber 6 through the water outlet 602. The anaerobic bacteria hydrolyze, acidify and methanate the organic matter, removing the organic matter in the wastewater and improving the biodegradability of the wastewater. The waste gas generated is collected by the gas collection pipe 604 at the top of the anaerobic chamber and discharged into the waste gas treatment chamber 8.

[0076] 7. The anaerobic wastewater enters the aeration chamber 7 through the water flow channel between the anaerobic chamber 6 and the aeration chamber 7. The oxidation disc 703 installed in the aeration chamber aerates the wastewater, and the wastewater is aerobically oxidized. The gas collection pipe collects the excess gas and discharges it into the air flotation sludge removal chamber 1.

[0077] 8. The exhaust gas from the flotation slag removal chamber 1 and the anaerobic chamber 6 enters the exhaust gas treatment chamber 8 through the air inlet 812. After being washed with dilute hydrochloric acid, it enters the exhaust gas alkalization absorption component and is dehumidified by the demister 803 before being discharged in compliance with standards.

[0078] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art can still adjust the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Therefore, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A black shale gas flow-back fluid treatment integrated device, characterized in that: The device comprises a device body, which comprises a gas float slag removal chamber (1), a coagulation sedimentation chamber (2), an ozone oxidation chamber (3), an adjusting chamber (4), a Fenton oxidation separation chamber (5), an anaerobic chamber (6), an aeration chamber (7), and a waste gas treatment chamber (8); The waste gas treatment chamber (8) is arranged at the top of the device body, and the gas float slag removal chamber (1), the coagulation sedimentation chamber (2), the ozone oxidation chamber (3), the adjusting chamber (4), the Fenton oxidation separation chamber (5), the anaerobic chamber (6), and the aeration chamber (7) are sequentially arranged below the waste gas treatment chamber (8); The waste gas treatment chamber (8) comprises a waste gas acidification absorption zone (801), a waste gas alkalization absorption zone (802), and a demister (803); the waste gas acidification absorption zone (801) is arranged at the bottom of the waste gas treatment chamber (8), the demister (803) is arranged at the top of the waste gas treatment chamber (8), the waste gas alkalization absorption zone (802) is arranged between the waste gas acidification absorption zone (801) and the demister (803), and the demister (803) is a baffle demister.

2. The integrated device for treating black and odorous shale gas flow-back fluid according to claim 1, characterized in that: The gas float slag removal chamber (1) comprises a water inlet pipe (101), a gas float disc (102), a water distribution pipe (103), a first gas collection pipe (104), a gas float blower (105), a slag overflow weir (106), a slag scraping plate (107), and a floating slag tank (108). The water inlet pipe (101) is arranged inside the gas float slag removal chamber (1), the gas float disc (102) is arranged at the middle lower part of the gas float slag removal chamber (1), the gas float disc (102) is a uniform microporous aeration disc, the water distribution pipe (103) is arranged at the top of the gas float disc (102), the water distribution pipe (103) is connected with the water inlet pipe (101), horizontal radiation water outlets are arranged on the water distribution pipe (103), the top plate of the gas float slag removal chamber (1) is convex, the first gas collection pipe (104) is arranged at the convex part of the top plate of the gas float slag removal chamber (1), the gas float blower (105) is arranged outside the gas float slag removal chamber (1), the gas float blower (105) is connected with the gas float disc (102) through a pipeline, the slag overflow weir (106) is arranged at the upper part of the gas float slag removal chamber (1), the slag scraping plate (107) is arranged inside the gas float slag removal chamber (1) and parallel to the slag overflow weir (106), and the floating slag tank (108) is arranged below the slag overflow weir (106).

3. The integrated device for treating black and odorous shale gas flow-back fluid according to claim 2, characterized in that: The coagulation sedimentation chamber (2) and the air floatation chamber (1) are provided with two coagulation sedimentation chamber inclined top plates (201), which are oppositely arranged on the chamber wall, and the angle between the two coagulation sedimentation chamber inclined top plates (201) and the chamber wall is 75°, the coagulation sedimentation chamber (2) comprises a coagulation stirring area (202) and a coagulation sedimentation area (203), the coagulation stirring area (202) comprises a coagulant adding meter (204) and a coagulation stirrer (205), and the coagulation sedimentation area (203) comprises a coagulation sedimentation area flow baffle (206) and a coagulation sedimentation chamber discharge valve (207). The coagulant adding meter (204) is arranged outside the coagulation stirring area (202) and connected to the inside of the coagulation stirring area (202) through a pipeline, the coagulation stirrer (205) is arranged inside the coagulation stirring area (202), the coagulation stirring area (202) is provided with an inclined coagulation stirring area bottom plate, the coagulation sedimentation area flow baffle (206) is arranged between the coagulation stirring area (202) and the coagulation sedimentation area (203), the coagulation sedimentation area flow baffle (206) is inclined to the coagulation stirring area (202) by 45°, the bottom of the coagulation sedimentation area (203) is in a conical structure, and the coagulation sedimentation chamber discharge valve (207) is arranged at the bottom of the conical structure.

4. The integrated device for treating black and odorous shale gas flow-back fluid according to claim 3, characterized in that: The ozone oxidation chamber (3) comprises a first partition plate (301), a second gas collecting pipe (302) and an ozone aeration system (303). The first partition plate (301) is arranged between the ozone oxidation chamber (3) and the coagulation sedimentation chamber (2), the top plate of the ozone oxidation chamber (3) is convex, the second gas collecting pipe (302) is arranged at the convex position of the top plate of the ozone oxidation chamber (3), and the ozone aeration system (303) comprises an ozone aeration pipe and an ozone generator, the ozone generator is arranged outside the ozone oxidation chamber (3), and the ozone generator is connected to the inside of the ozone oxidation chamber (3) through the ozone aeration pipe.

5. The integrated device for treating black and odorous shale gas flow-back fluid according to claim 4, characterized in that: The adjusting chamber (4) comprises an acid-base measuring controller (401) and an adjusting chamber stirrer (402). The acid-base measuring controller (401) comprises a pH value measuring probe and an acid liquid metering device, the acid liquid metering device is arranged outside the adjusting chamber (4), the pH value measuring probe is inlaid on the inner wall of the adjusting chamber (4), the acid-base measuring controller (401) controls the pH value of the wastewater to be 3, the adjusting chamber stirrer (402) is arranged inside the adjusting chamber (4), and the bottom of the adjusting chamber (4) is provided with an inclined adjusting chamber bottom plate.

6. The integrated device for treating black and odorous shale gas flow-back fluid according to claim 5, characterized in that: The Fenton oxidation separation chamber (5) comprises a Fenton oxidation stirring zone (501) and a Fenton oxidation precipitation zone (502), the Fenton oxidation stirring zone (501) comprises a Fenton oxidation agent adding meter (503) and a Fenton oxidation stirrer (504), and the Fenton oxidation precipitation zone (502) comprises a Fenton oxidation precipitation zone baffle (505) and a Fenton oxidation separation chamber discharge valve (506); The Fenton oxidation agent adding meter (503) is arranged outside the Fenton oxidation stirring zone (501) and is connected to the inside of the Fenton oxidation stirring zone (501) through a pipeline, the Fenton oxidation stirrer (504) is arranged inside the Fenton oxidation stirring zone (501), the bottom of the Fenton oxidation stirring zone (501) is provided with an inclined Fenton oxidation stirring zone bottom plate, the Fenton oxidation precipitation zone baffle (505) is arranged between the Fenton oxidation stirring zone (501) and the Fenton oxidation precipitation zone (502), the Fenton oxidation precipitation zone baffle (505) is inclined to the Fenton oxidation stirring zone (501) by 45°, the bottom of the Fenton oxidation precipitation zone (502) is in a conical structure, and the Fenton oxidation separation chamber discharge valve (506) is arranged at the bottom of the conical structure.

7. The integrated device for treating black and odorous produced water according to claim 6, characterized in that: The anaerobic chamber (6) comprises a second partition plate (601), a water flow port (602), an anaerobic stirrer (603), a third gas collecting pipe (604) and an anaerobic chamber discharge valve (605); The second partition plate (601) is arranged between the anaerobic chamber (6) and the Fenton oxidation separation chamber (5), the water flow port (602) is arranged on the second partition plate (601), the anaerobic chamber (6) is provided with an inclined anaerobic chamber bottom plate, the anaerobic stirrer (603) is arranged at the bottom of the anaerobic chamber (6), the top plate of the anaerobic chamber (6) is in a convex shape, the third gas collecting pipe (604) is arranged at the convex part of the top plate of the anaerobic chamber (6), the bottom of the anaerobic chamber (6) is in a conical structure, and the anaerobic chamber discharge valve (605) is arranged at the bottom of the conical structure.

8. The integrated device for treating black and odorous produced water according to claim 7, characterized in that: The aeration chamber (7) comprises a third partition plate (701), a fourth gas collecting pipe (702), an oxidation disc (703), an oxidation blower (704), an inspection window (705) and an overflow weir (706); The third partition (701) is arranged between the aeration chamber (7) and the anaerobic chamber (6), the top plate of the aeration chamber (7) is convex, the fourth gas collecting pipe (702) is arranged at the convex part of the top plate of the aeration chamber (7), the oxidation disc (703) is arranged at the middle and lower part of the aeration chamber (7), the oxidation disc (703) is a uniform microporous aeration disc, the oxidation blower (704) is arranged outside the aeration chamber (7), the oxidation blower (704) is connected with the oxidation disc (703) through a pipeline, the maintenance window (705) is arranged above the side of the aeration chamber (7), and the overflow weir (706) is arranged at the bottom of the maintenance window (705).

9. The integrated device for treating black and smelly shale gas flow-back fluid according to claim 8, characterized in that: The waste gas acidification absorption zone (801) is internally provided with a waste gas acidification absorption assembly, the waste gas acidification absorption assembly comprises an acid solution spraying device (804), an acid solution storage tank (805), an acid solution circulating pump (806) and an acid adding device (810), the waste gas alkalinization absorption zone (802) is internally provided with a waste gas alkalinization absorption assembly, the waste gas alkalinization absorption assembly comprises an alkaline solution spraying device (807), an alkaline solution storage tank (808), an alkaline solution circulating pump (809) and an alkali adding device (811), the acid solution spraying device (804) is arranged inside the waste gas acidification absorption zone (801), the acid solution storage tank (805) is arranged at the bottom of the acid solution spraying device (804), the acid solution circulating pump (806) is connected with the acid solution spraying device (804) and the acid solution storage tank (805) through a pipeline, the acid adding device (810) comprises an acid tank and a stirring device, the acid tank is connected with the acid solution circulating pump (806) through a pipeline and a valve, the alkaline solution spraying device (807) is arranged inside the waste gas alkalinization absorption zone (802), the alkaline solution storage tank (808) is arranged at the bottom of the alkaline solution spraying device (807), the alkaline solution circulating pump (809) is connected with the alkaline solution spraying device (807) and the alkaline solution storage tank (808) through a pipeline, the alkali adding device (811) comprises an alkali tank and a stirring device, the alkali tank is connected with the alkaline solution circulating pump (809) through a pipeline and a valve, the acid solution spraying device (804) and the alkaline solution spraying device (807) are spiral spraying devices, an air inlet (812) is arranged at the bottom of the waste gas treatment chamber (8), the top of the waste gas treatment chamber (8) is in a conical structure, a waste gas outlet (813) is arranged at the top of the conical structure, and a spraying water collecting device (814) is arranged inside the waste gas acidification absorption zone (801) and the waste gas alkalinization absorption zone (802).

10. The integrated device for treating black and odorous produced water according to claim 9, characterized in that: Further comprising a roller (9), the roller (9) is arranged at the bottom of the device body. The coagulant of the coagulant adding meter (204) is a polymeric ferric sulfate solution, the acid of the acid adding meter is waste hydrochloric acid or waste sulfuric acid, the Fenton oxidant of the Fenton oxidant adding meter (503) is hydrogen peroxide solution and iron-carbon agent, the acid solution of the waste gas acidification absorption assembly is dilute hydrochloric acid, and the alkaline solution of the waste gas alkalization absorption assembly is sodium hydroxide solution or lime water.

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