Vertical flow coagulation air floatation integrated device and operation waste liquid treatment method

Abstract

This invention discloses a vertical flow coagulation-flotation integrated device and a method for treating operational wastewater. The device includes a primary dissolved air pump, a tubular reactor, a reaction cylinder component, and a secondary dissolved air pump. The tubular reactor is equipped with a wastewater inlet, a wastewater outlet, and a reactor dissolved air / water inlet. The primary dissolved air pump is connected to the reactor dissolved air / water inlet, the wastewater outlet is connected to the reaction cylinder component, and the reaction cylinder component is connected to the secondary dissolved air pump. This invention employs a dual-stage dissolved air pump multi-point cascade release technology, enhancing the treatment effect on suspended solids and polymers in operational wastewater through multi-stage reactions. This invention integrates multi-flow flocculation, microbubble cascade release, and laminar flow sedimentation processes into a single device, forming a short-process combined process, reducing device size and floor space.

Description

Technical Field

[0001] This invention belongs to the field of safety, environmental protection, energy conservation and water saving technology, and specifically relates to a vertical flow coagulation and flotation integrated device and a method for treating waste liquid during operation. Background Technology

[0002] In recent years, the application scale of various measures in oilfields (well repair and cleaning, fracturing, acidizing, drilling control and blowout, etc.) has been continuously increasing, and the amount of waste fluid from these operations has been continuously increasing. Once these waste fluids enter the ecological cycle, they will pollute the soil and water resources, posing a great safety and environmental hazard, seriously restricting the green development of oilfields, and easily causing water waste. If these waste fluids directly enter the production system, they will have a significant impact on the system, affecting the properties of extracted oil products and the quality of reinjection water. Therefore, it is urgent to improve the treatment efficiency of operational waste fluids and the matching degree of water quality and quantity for waste fluid reuse, and to increase the wastewater reuse rate. This will help reduce the environmental pressure on the natural environment, save clean water resources, and play an important supporting role in ensuring stable and increased production in oil and gas fields.

[0003] Most existing wastewater treatment devices in China employ horizontal flow reactors, combining units such as regulation, dosing, coagulation, flotation, and filtration into a highly efficient process for synergistic treatment. Each treatment step requires a separate treatment tank, resulting in a long process flow. In particular, the long residence times for flocculation and flotation, and the high correlation between treatment efficiency and dosing intensity, lead to a significant increase in production costs for wastewater with high suspended solids content and high viscosity. The combined horizontal flow reactors, with their large footprint, low reaction efficiency, and high manufacturing costs, highlight the growing contradiction between efficient wastewater reuse and production efficiency.

[0004] Therefore, in order to support the high-quality development of oil and gas field enterprises, it is necessary to further develop efficient coagulation flotation devices and their supporting process technologies through structural innovation and process. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a vertical flow coagulation-flotation integrated device and a method for treating operational wastewater, which is used to treat operational wastewater with high suspended solids content, high viscosity, and severe emulsification.

[0006] A vertical flow coagulation-flotation integrated device includes a primary dissolved air pump, a tubular reactor, a reaction cylinder component, and a secondary dissolved air pump. The tubular reactor is equipped with a waste liquid inlet, a waste liquid outlet, and a reactor dissolved air / water inlet. The primary dissolved air pump is connected to the reactor dissolved air / water inlet, the waste liquid outlet is connected to the reaction cylinder component, and the reaction cylinder component is connected to the secondary dissolved air pump.

[0007] Furthermore, the reaction cylinder component includes an outer cylinder, a central cylinder, and a water inlet pipe;

[0008] The central cylinder is vertically arranged inside the outer cylinder, and the central cylinder and the outer cylinder are concentrically arranged. The upper end of the outer cylinder is provided with a sealing cap for sealing the upper end of the outer cylinder and the central cylinder. The upper end face of the central cylinder is higher than the upper end face of the sealing cap. A water inlet is provided on the side wall of the central cylinder below the sealing cap. A water outlet is provided at the bottom of the central cylinder. A conical end cap is provided at the bottom of the outer cylinder. The water outlet and the conical end cap have a certain gap. A reaction cylinder dissolved gas water inlet is provided on the side wall of the central cylinder near the water outlet. The waste liquid outlet is connected to the central cylinder through the water inlet pipe. The secondary dissolved gas pump is connected to the reaction cylinder dissolved gas water inlet.

[0009] Furthermore, the reaction cylinder component also includes an upper annular baffle, a lower annular baffle, inclined tube packing, and a skirt.

[0010] The skirt seat is fixedly connected to the outer side of the conical head. The lower annular baffle is arranged around the outer side of the central cylinder. The inner side of the lower annular baffle and the outer side of the central cylinder form a first cavity. The bottom of the lower annular baffle is connected to the inner side of the conical head. The upper end of the lower annular baffle has a certain gap with the inner wall of the sealing cover. The upper annular baffle is arranged around the outer side of the lower annular baffle. The inner side of the upper annular baffle and the outer side of the lower annular baffle form a second cavity. The outer side of the upper annular baffle and the inner wall of the outer cylinder form a third cavity. The upper end of the upper annular baffle is connected to the inner wall of the sealing cover. The bottom of the upper annular baffle has a certain gap with the inner wall of the conical head. The inclined tube packing is arranged in the third cavity.

[0011] Furthermore, the central cylinder includes a conical top, a first straight cylinder section, a conical section, and a second straight cylinder section;

[0012] Wherein, the outer diameter of the first straight section is larger than the outer diameter of the second straight section, and the conical top, the first straight section, the conical section, and the second straight section are connected in sequence from top to bottom; the conical top is located above the sealing cover, the water outlet is located at the bottom of the second straight section, and the dissolved gas water inlet of the reaction cylinder is located on the side wall of the conical section.

[0013] Furthermore, an eddy current generator is provided on the inner wall of the first straight section.

[0014] Furthermore, the angle between the water inlet pipe and the horizontal plane is -5° to -10°, and the centerline of the water inlet pipe is tangent to the inner wall of the central cylinder.

[0015] Furthermore, the reaction cylinder component also includes a slag discharge pipe, an exhaust pipe, a water outlet tank, a sewage branch valve, and a sewage main valve;

[0016] The slag discharge pipe is located on the side wall of the top of the cone, the exhaust pipe is located on the upper end face of the top of the cone, the water outlet trough is located on the side wall of the outer cylinder above the inclined tube packing, the sewage branch valve is located on the side wall of the conical head outside the lower annular baffle, and the sewage main valve is located on the outer side wall of the conical head below the water outlet.

[0017] Furthermore, the reactor dissolved air water inlet includes two first dissolved air water inlets, two second dissolved air water inlets and two third dissolved air water inlets, and a first dissolved air outlet pipeline, a first dissolved air branch, a second dissolved air branch and a third dissolved air branch are provided between the primary dissolved air pump and the reactor dissolved air water inlet;

[0018] The first dissolved gas branch is connected to two first dissolved gas water inlets at one end, the second dissolved gas branch is connected to two second dissolved gas water inlets at one end, and the third dissolved gas branch is connected to two third dissolved gas water inlets at one end. The other ends of the first dissolved gas branch, the second dissolved gas branch, and the third dissolved gas branch are all connected to the first dissolved gas pump through the first dissolved gas outlet pipeline.

[0019] Furthermore, the dissolved gas water inlet of the reaction cylinder includes a fourth dissolved gas water inlet, a fifth dissolved gas water inlet, a sixth dissolved gas water inlet and a seventh dissolved gas water inlet arranged diagonally in pairs, and a second dissolved gas outlet pipeline, a fourth dissolved gas branch, a fifth dissolved gas branch, a sixth dissolved gas branch and a seventh dissolved gas branch are provided between the secondary dissolved gas pump and the dissolved gas water inlet of the reaction cylinder;

[0020] The fourth, fifth, sixth, and seventh dissolved gas branches are connected at one end to the fourth, fifth, sixth, and seventh dissolved gas water inlets, respectively, and the other end of each branch is connected to the secondary dissolved gas pump via the second dissolved gas outlet pipeline.

[0021] Furthermore, the dissolved air water entering the first, second, and third dissolved air branches is opposite to the water flow direction of the tubular projector, and the dissolved air water flow direction of the first, second, and third dissolved air branches is at an angle of 30° to 40° to the water flow direction in the tubular reactor.

[0022] Furthermore, the dissolved air water entering the fourth, fifth, sixth, and seventh dissolved air branches is at an angle of 45° to 60° to the vertical centerline of the first straight cylinder section.

[0023] Furthermore, the vortex generator has an "eagle beak" structure, comprising a first arc-shaped surface at the rear end, a double arc-shaped sectional surface at the upper end, and a second arc-shaped surface at the lower end.

[0024] Furthermore, the primary dissolved air pump and the secondary dissolved air pump are connected to the water outlet tank.

[0025] The present invention also provides a method for treating operational wastewater, comprising the following steps:

[0026] The first microbubbles generated by the first-stage dissolved air pump are used to carry out a first-stage mixed flow reaction on the working waste liquid of the tubular reactor.

[0027] The tubular reactor transports the waste liquid from the primary mixed-flow reaction to the reaction cylinder component for flocculation reaction;

[0028] When the waste liquid from the primary mixed-flow reaction undergoes flocculation in the reaction cylinder component, a second microbubble is generated by a secondary dissolved air pump to carry out a secondary mixed-flow reaction on the waste liquid in the reaction cylinder component.

[0029] The waste liquid inside the reaction cylinder is separated into scum, waste gas, sludge and clean water through flocculation reaction and secondary mixed flow reaction.

[0030] The beneficial effects of this invention are:

[0031] 1. This invention employs a two-stage dissolved air pump multi-point cascade release technology, which enhances the treatment effect on suspended solids and polymers in the waste liquid through multi-stage reactions.

[0032] 2. This invention couples microbubble oxidation and depolymerization with multi-flow-state cascade flocculation, enhances the depolymerization and coalescence separation effects of the eddy current field, establishes a synergistic mechanism for rapid destabilization and separation of polymer waste liquid systems by flow state and microbubbles, and forms a short-process polymer-containing waste liquid treatment system.

[0033] 3. The central cylinder is the main reaction zone for coagulation and air flotation, which consists of, from bottom to top, the mixed flow reaction zone, the eddy current reaction zone, the swirling flow reaction zone, and the scum zone. The reaction zones are intertwined and mutually reinforcing, greatly enhancing the coagulation and air flotation effects.

[0034] 4. This invention integrates multi-flow flocculation, microbubble cascade release, and laminar flow settling processes into a single device, forming a short-process combined process that reduces device size and floor space.

[0035] 5. This invention adopts a composite hydraulic reaction zone, which effectively shortens the flocculation reaction time. The main process uses physical methods to enhance the debinding, destabilization, and flocculation of the waste liquid. It does not increase the amount of reagents for treating complex waste liquids, thus reducing operating costs.

[0036] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A schematic diagram of a vertical flow coagulation-flotation integrated device according to an embodiment of the present invention is shown.

[0039] Figure 2 A schematic diagram of each reaction zone of a vertical flow coagulation-flotation integrated device according to an embodiment of the present invention is shown;

[0040] Figure 3 A schematic diagram of the installation of each dissolved gas branch according to an embodiment of the present invention is shown;

[0041] Figure 4 A schematic diagram of the structure of an eddy current generator according to an embodiment of the present invention is shown.

[0042] In the diagram: 1. Primary dissolved air pump; 2. Tubular reactor; 3. Inlet pipe; 4. Slag discharge pipe; 5. Exhaust pipe; 6. Outer cylinder; 7. Upper annular baffle; 8. Lower annular baffle; 9. Conical head; 10. Skirt; 11. Secondary venting valve; 12. Sealing cover; 13. Vortex generator; 14. Central cylinder; 15. Outlet tank; 16. Inclined tube packing; 17. Sewage branch valve; 18. Secondary dissolved air pump; 19. Main sewage discharge valve; 20. First venting valve; 21. First dissolved air outlet pipe; 22. First dissolved air outlet pipe. 23. Dissolved gas branch; 24. Second dissolved gas branch; 25. Third dissolved gas branch; 26. Second dissolved gas outlet pipe; 27. Fourth dissolved gas branch; 28. Fifth dissolved gas branch; 29. ​​Sixth dissolved gas branch; 20. Seventh dissolved gas branch; 31. Clear water return pipe; 132. First arc-shaped surface; 133. Double arc-shaped surface; 14. Second arc-shaped surface; A. Scum zone; B. Swirl reaction zone; C. Vortex reaction zone; D. Mixed flow reaction zone; E. Sludge discharge zone; F. Reversed laminar flow zone; G. Inclined tube settling zone; H. Clear water zone. Detailed Implementation

[0043] 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 some embodiments of the present invention, not all embodiments. 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.

[0044] It should be noted that the directional terms used in the embodiments of the present invention, such as "up," "down," "left," and "right," generally refer to the directions shown in the accompanying drawings; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer sides relative to the contours of each component itself. The terms "first," "second," and "third," etc., are used for descriptive purposes only.

[0045] This invention provides a vertical flow integrated coagulation and flotation device that integrates multiple functions such as coagulation, flotation, and sedimentation. It is used to treat operational wastewater with high suspended solids content, high viscosity, and severe emulsification. This invention employs a combination of multi-flow flocculation, microbubble cascade release, and recirculating laminar flow sedimentation processes to achieve efficient removal of multiphase pollutants.

[0046] Please see Figure 1 , Figure 1 A schematic diagram of a vertical flow coagulation-flotation integrated device according to an embodiment of the present invention is shown.

[0047] A vertical flow coagulation-flotation integrated device includes a primary dissolved air pump 1, a tubular reactor 2, a reaction cylinder component, and a secondary dissolved air pump 18. The tubular reactor 2 is equipped with a waste liquid inlet, a waste liquid outlet, and a reactor dissolved air water inlet. The working waste liquid enters the tubular reactor 2 through the waste liquid inlet. The primary dissolved air pump 1 is connected to the reactor dissolved air water inlet, and the high-speed dissolved air water generated by the primary dissolved air pump 1 enters the tubular reactor 2 through the reactor dissolved air water inlet, where microbubbles in the high-speed dissolved air water undergo a first mixing reaction with the working waste liquid. The waste liquid outlet is connected to the reaction cylinder component, and the working waste liquid after the first mixing reaction enters the reaction cylinder component through the waste liquid outlet. The reaction cylinder component is connected to the secondary dissolved air pump 18, and the high-speed dissolved air water generated by the secondary dissolved air pump 18 enters the reaction cylinder component, where microbubbles in the high-speed dissolved air water undergo a second mixing reaction with the working waste liquid.

[0048] This invention employs a two-stage dissolved air pump multi-point cascade release technology. The two stages of the dissolved air pump generate microbubbles of different diameters: the first-stage pump 1 generates microbubbles of 40–60 micrometers, and the second-stage pump 18 generates microbubbles ≤40 micrometers. The first-stage microbubbles act in the tubular reactor 2 to carry out a primary mixed-flow reaction on the wastewater, while the second-stage microbubbles act in the reaction cylinder component to carry out a secondary mixed-flow reaction on the wastewater. Through multi-stage reactions, the treatment effect on suspended solids and polymers in the wastewater is enhanced.

[0049] In one embodiment, the reaction cylinder component includes an outer cylinder 6, a central cylinder 14, and a water inlet pipe 3. The central cylinder 14 is vertically disposed inside the outer cylinder 6 and is concentric with the outer cylinder 6. A sealing cap 12 for sealing the upper end of the outer cylinder 6 and the central cylinder 14 is disposed at the upper end of the outer cylinder 6. The upper end face of the central cylinder 14 is higher than the upper end face of the sealing cap 12. A water inlet is disposed on the side wall of the central cylinder 14 below the sealing cap 12. A water outlet is disposed at the bottom of the central cylinder 14. A conical head 9 is disposed at the bottom of the outer cylinder 6, and there is a certain gap between the water outlet and the conical head 9.

[0050] The central cylinder 14 is equipped with a dissolved air water inlet on the side wall near the outlet. The waste liquid outlet is connected to the central cylinder 14 through the inlet pipe 3. The work waste liquid after the first-stage mixing reaction enters the central cylinder 14 through the waste liquid outlet. The second-stage dissolved air pump 18 is connected to the dissolved air water inlet of the reaction cylinder. The high-speed dissolved air water generated by the second-stage dissolved air pump 18 enters the central cylinder 14 through the dissolved air water inlet of the reaction cylinder. The microbubbles in the high-speed dissolved air water are fully mixed and contacted with the work waste liquid to form a flocculation reaction and further break down the polymer.

[0051] In one embodiment, the reaction cylinder component further includes an upper annular baffle 7, a lower annular baffle 8, inclined tube packing 16, and a skirt 10. The upper end of the skirt 10 is fixedly connected to the outer side of the conical head 9, and the skirt 10 provides support. The lower annular baffle 8 is arranged around the outer side of the central cylinder 14. The inner side of the lower annular baffle 8 and the outer side of the central cylinder 14 form a first cavity. The bottom of the lower annular baffle 8 is connected to the inner side of the conical head 9. The upper end of the lower annular baffle 8 has a certain gap with the inner wall of the sealing cover 12. The upper annular baffle 7 is arranged around the outer side of the lower annular baffle 8. The inner side of the upper annular baffle 7 and the outer side of the lower annular baffle 8 form a second cavity. The outer side of the upper annular baffle 7 and the inner wall of the outer cylinder 6 form a third cavity. The upper end of the upper annular baffle 7 is connected to the inner wall of the sealing cover 12. The bottom of the upper annular baffle 7 and the inner wall of the conical head 9 have a certain gap. The inclined tube packing 16 is arranged in the third cavity. The inclined tube packing 16 is a hexagonal honeycomb inclined tube packing 16.

[0052] In one embodiment, the central cylinder 14 includes a conical top, a first straight cylinder section, a conical section, and a second straight cylinder section. The outer diameter of the first straight cylinder section is larger than the outer diameter of the second straight cylinder section. The conical top, the first straight cylinder section, the conical section, and the second straight cylinder section are connected sequentially from top to bottom. The conical top is located above the sealing cap 12, the water outlet is located at the bottom of the second straight cylinder section, and the dissolved air water inlet of the reaction cylinder is located on the side wall of the conical section.

[0053] Furthermore, the reaction cylinder component also includes a slag discharge pipe 4 and an exhaust pipe 5. The slag discharge pipe 4 is located on the side wall of the cone top, and the exhaust pipe 5 is located on the upper end face of the cone top.

[0054] Please see Figure 2 , Figure 2 A schematic diagram of each reaction zone of a vertical flow coagulation-flotation integrated device according to an embodiment of the present invention is shown.

[0055] In this embodiment, the top of the cone is the scum zone, the first straight section is the swirling reaction zone and the eddy reaction zone from top to bottom, and the lower end of the first straight section, the cone section and the second straight section are the mixed flow reaction zones.

[0056] The device of the present invention adopts hydraulic slag discharge. A slag zone is set at the upper part of the central cylinder 14. The waste slag generated by flocculation and air flotation forms slag in the slag zone and is discharged by the slag discharge pipe 4.

[0057] The central cylinder 14 is the main reaction zone for coagulation and air flotation, which consists of, from bottom to top, the mixed flow reaction zone, the eddy current reaction zone, the swirling flow reaction zone, and the scum zone. The reaction zones are intermingled and mutually reinforcing, greatly enhancing the coagulation and air flotation effects.

[0058] In this embodiment, the central cylinder 14 adopts a cone-column-cone-column structure. From top to bottom, the central cylinder 14 consists of a scum zone, a swirling reaction zone, a eddy reaction zone, and a mixed-flow reaction zone. The top is the scum zone, which adopts a cone-shaped structure to facilitate scum concentration. The cone angle of the cone section is 60°, and the cone section adopts a constricted straight section to reduce the water outlet area and extend the reaction time.

[0059] Furthermore, the inner wall of the first cylindrical section is provided with vortex generators 13. There are a total of 5 layers of vortex generators 13, with 4 to 6 generators in each layer, and the layers are staggered.

[0060] A vortex generator 13 is installed in the first straight section of the central cylinder 14. The vortex generator 13 accelerates the formation of a vortex pattern in the mixed liquid. Compared with a device without the vortex generator 13, the vortex area can be increased by 30% to 50%.

[0061] Furthermore, the angle between the water inlet pipe 3 and the horizontal plane is -5° to -10°, and the centerline of the water inlet pipe 3 is tangent to the wall of the central cylinder 14.

[0062] In this embodiment, the water inlet pipe 3 enters tangentially at an angle of -5° to -10° to the horizontal plane, forming a swirling flow in the central cylinder 14, resulting in swirling flocculation. The swirling zone has a strong centrifugal force field and high turbulence, increasing the probability of instantaneous collision of destabilized colloids and improving flocculation efficiency. The vortex effect generated by the vortex generator 13 set on the inner wall of the central cylinder 14 contacts and collides with the swirling effect generated by the incoming water, forming a vortex reaction zone in the collision zone. This causes the flocs formed in the swirling reaction zone to accumulate and grow larger in the vortex reaction zone, and under the action of microbubbles, form dense flocs.

[0063] In addition, the swirling reaction of the water entering the water comes into contact with the eddy reaction generated by the eddy generator 13. The high speed of the swirling flow and the slow speed of the eddy flow form a velocity gradient difference, which promotes the establishment of the eddy reaction zone. In the eddy reaction zone, the flocs are generated more quickly and with higher density, greatly improving the flocculation effect.

[0064] In this embodiment, the area between the bottom of the second straight section and the inner side of the lower annular baffle 8 and the conical head 9 is the first sludge discharge zone; the area between the outer side of the lower annular baffle 8 and the bottom of the inclined tube packing 16 and the conical head 9 is the second sludge discharge zone; the area between the inner side of the lower annular baffle 8 and the outer side of the central cylinder 14 above the first sludge discharge zone is the first deflected laminar flow zone; the area between the inner side of the upper annular baffle 7 and the outer side of the lower annular baffle 8 above the second sludge discharge zone is the second deflected laminar flow zone; the inclined tube packing 16 is the inclined tube settling zone; and the area above the inclined tube settling zone is the clear water zone.

[0065] The reversible laminar flow zone employs a two-stage baffle system, combined with a settling zone filled with hexagonal honeycomb inclined tube packing 16, to provide subsequent replenishment treatment for the operational wastewater. After subsequent treatment, the residual flocs in the operational wastewater are further removed by settling, ensuring the quality of the effluent.

[0066] By integrating multi-flow flocculation, microbubble cascade release, and laminar flow settling into a single device, a short-process combined process is formed, reducing the size of the device and the floor space required.

[0067] Furthermore, an outlet groove 15 is provided on the side wall of the outer cylinder 6 above the inclined tube packing 16, a drain branch valve 17 is provided on the side wall of the conical head 9 outside the lower annular baffle 8, and a drain main valve 19 is provided on the outer side wall of the conical head 9 below the outlet.

[0068] The device of this invention adopts gravity sludge discharge, and the sludge discharge zone adopts a cone structure. The sludge is discharged by the sludge branch valve 17 and the sludge main valve 19.

[0069] In one embodiment, the primary stage adopts multi-point dissolved gas release. Specifically, the dissolved gas water inlet of the reactor includes two first dissolved gas water inlets, two second dissolved gas water inlets, and two third dissolved gas water inlets. The two first dissolved gas water inlets, two second dissolved gas water inlets, and two third dissolved gas water inlets are sequentially arranged at the upstream, middle, and downstream of the working waste liquid flow direction of the tubular reactor 2.

[0070] In this embodiment, each dissolved gas branch in the primary dissolved gas is divided into two inlets to enter the tubular reactor 2, and each dissolved gas branch enters the tubular reactor at an angle of 30° to 40°.

[0071] Specifically, such as Figure 1As shown, a first dissolved gas outlet pipe 21, a first dissolved gas branch 22, a second dissolved gas branch 23, and a third dissolved gas branch 24 are provided between the first dissolved gas pump 1 and the dissolved gas water inlet of the reactor. One end of the first dissolved gas branch 22 is connected to two first dissolved gas water inlets, one end of the second dissolved gas branch 23 is connected to two second dissolved gas water inlets, and one end of the third dissolved gas branch 24 is connected to two third dissolved gas water inlets. The other ends of the first dissolved gas branch 22, the second dissolved gas branch 23, and the third dissolved gas branch 24 are all connected to the first dissolved gas pump 1 through the first dissolved gas outlet pipe 21.

[0072] Furthermore, a first gas release valve 20 is provided on the first dissolved gas branch 22, the second dissolved gas branch 23 and the third dissolved gas branch 24, and the first dissolved gas outlet pipeline 21 includes a first pressure measuring point, a first valve, a first check valve and a second valve connected in sequence.

[0073] Please see Figure 3 , Figure 3 A schematic diagram of the installation of each dissolved gas branch according to an embodiment of the present invention is shown.

[0074] The secondary dissolved gas release adopts an opposing angle form. Specifically, the dissolved gas water inlet of the reaction cylinder includes a fourth, fifth, sixth, and seventh dissolved gas water inlet arranged diagonally. A second dissolved gas outlet pipe 25, a fourth dissolved gas branch 26, a fifth dissolved gas branch 27, a sixth dissolved gas branch 28, and a seventh dissolved gas branch 29 are provided between the secondary dissolved gas pump 18 and the dissolved gas water inlet of the reaction cylinder. One end of the fourth dissolved gas branch 26, the fifth dissolved gas branch 27, the sixth dissolved gas branch 28, and the seventh dissolved gas branch 29 is connected to the fourth, fifth, sixth, and seventh dissolved gas water inlets, respectively. The other end of the fourth dissolved gas branch 26, the fifth dissolved gas branch 27, the sixth dissolved gas branch 28, and the seventh dissolved gas branch 29 is connected to the secondary dissolved gas pump 18 through the second dissolved gas outlet pipe 25.

[0075] Furthermore, a second gas release valve 11 is provided on the fourth dissolved gas branch 26, the fifth dissolved gas branch 27, the sixth dissolved gas branch 28 and the seventh dissolved gas branch 29. The second dissolved gas outlet pipeline 25 includes a second pressure measuring point, a third valve, a second check valve and a fourth valve connected in sequence.

[0076] In this embodiment, each dissolved gas branch is equipped with a release valve. By reducing the valve opening, a "pressure build-up" effect is created, increasing the dissolved gas water pressure and facilitating the formation of microbubbles in a mixed-flow reaction. Valves and check valves are installed in the first dissolved gas outlet pipe 21 and the second dissolved gas outlet pipe 25 to facilitate the maintenance and repair of the dissolved gas pump and pipelines.

[0077] The first-stage dissolved gas release employs a three-point release method, with each release pipe outlet generating a mixed flow zone 5-7 times the pipe diameter. Each dissolved gas branch in the first stage can generate two mixed flow zones. The second-stage dissolved gas release uses an opposing angle release method, generating four mixed flow zones. These mixed flow zones can interweave, forming a compound mixed flow effect. This ensures the entire mixed flow zone is filled with a mixed flow effect, accelerating the collision between microbubbles and colloidal particles in the waste liquid, destabilizing the colloids, and ensuring thorough mixing of microbubbles with particulate matter in the waste liquid to form larger flocs.

[0078] In one embodiment, the dissolved air water entering the first dissolved air branch 22, the second dissolved air branch 23, and the third dissolved air branch 24 is opposite to the water flow direction in the tubular reactor 2, and the dissolved air water flow direction in the first dissolved air branch 22, the second dissolved air branch 23, and the third dissolved air branch 24 enters at an angle of 30° to 40° to the water flow direction in the tubular reactor 2, forming a countercurrent mixing reaction, increasing the impact effect, and strengthening the depolymerization and flocculation effect.

[0079] The secondary dissolved air release employs a four-way countercurrent system. The high-pressure dissolved air containing microbubbles generated by the secondary dissolved air pump 18 enters the vortex reaction zone of the central cylinder 14 via four separate paths. The dissolved air from the fourth, fifth, sixth, and seventh dissolved air branches 26, 27, 28, and 29 enters the lower conical section of the central cylinder 14 at an angle of 45° to 60° to the vertical centerline of the first and second straight sections. The four high-pressure dissolved air streams simultaneously undergo flotation, creating a multi-channel mixed-flow reaction in the flotation reaction zone. This ensures thorough mixing of microbubbles with particulate matter in the waste liquid, enhancing the debinding and flocculation effects.

[0080] Furthermore, the inlets of the primary dissolved air pump 1 and the secondary dissolved air pump 18 are connected to the outlet tank 15 through the clear water return pipeline 30. A fifth valve is installed on the clear water return pipeline 30, a sixth valve is installed between the inlet of the primary dissolved air pump 1 and the clear water return pipeline 30, and a seventh valve is installed between the inlet of the secondary dissolved air pump 18 and the clear water return pipeline 30. A portion of the effluent from the outlet tank 15 is returned to the primary dissolved air pump 1 and the secondary dissolved air pump 18 for dissolved air flotation reaction, thus recycling the treated water and reducing operating costs.

[0081] In this embodiment, the primary dissolved air pump 1 and the secondary dissolved air pump 18 have the same structure. Taking the primary dissolved air pump 1 as an example, the primary dissolved air pump 1 includes a pressurizing pump and a dissolved air tank. The air inlet of the pressurizing pump is connected to the atmosphere, the water inlet of the pressurizing pump is connected to one end of the clean water return pipeline 30, the dissolved air outlet of the pressurizing pump is connected to the bottom of the pressurizing tank, the side of the dissolved air tank is connected to one end of the first dissolved air outlet pipeline 21, and an exhaust valve is provided on the top of the dissolved air tank.

[0082] In one embodiment, four drain branch valves 17 are provided. The four drain branch valves 17 and four second vent valves 11 are evenly distributed on the conical head 9. The eight valves are evenly distributed around the device, which is aesthetically pleasing and easy to operate.

[0083] Please see Figure 4 , Figure 4 A schematic diagram of the structure of an eddy current generator according to an embodiment of the present invention is shown.

[0084] In one embodiment, the vortex generator 13 adopts a "beak-shaped" multi-curved surface structure with a front beak angle of 15° to 20°. The vortex generator 13 includes a first arc-shaped surface 131 at the rear end, a double arc-shaped tangent surface 132 at the upper end, and a second arc-shaped surface 133 at the lower end. The first arc-shaped surface 131 at the rear end is in contact with the wall of the central cylinder 14. The upper curved surface is a double arc-shaped tangent surface 132, and the second arc-shaped surface 133 is an arc surface with a large radius of curvature. This ensures that the vortex generator 13 does not generate a "dead zone" for floc settling and is conducive to the generation of vortices.

[0085] The specific working principle of the device of this invention is as follows: The waste liquid first enters the tubular reactor 2. At this time, a primary microbubble release occurs in the tubular reactor 2. High-speed dissolved air water generated by the primary dissolved air pump 1 enters the tubular reactor 2 through the first dissolved air branch 22, the second dissolved air branch 23, and the third dissolved air branch 24 at opposing angles. The microbubbles in the high-speed dissolved air water produce a first mixing reaction with the waste liquid, allowing the microbubbles to fully contact the suspended matter in the waste liquid and to initially break up the polymer. A first release valve 20 is installed on the release pipe, but it can be omitted. By reducing the opening of the first release valve 20, the dissolved air water pressure can be increased. The size of the primary microbubbles is 50-70 micrometers.

[0086] The wastewater from the primary mixing reaction enters the central cylinder 14 tangentially through the inlet pipe 3. In the swirling reaction zone of the central cylinder 14, the wastewater undergoes a swirling flocculation reaction, with a large swirling reaction zone near the cylinder wall and a small swirling reaction zone near the center. During the swirling reaction, high-speed dissolved air water generated by the secondary dissolved air pump 18 enters the mixed-flow reaction zone of the central cylinder 14 at an opposing angle through the fourth dissolved air branch 26, the fifth dissolved air branch 27, the sixth dissolved air branch 28, and the seventh dissolved air branch 29. In the mixed-flow reaction zone, the microbubbles in the high-speed dissolved air water fully mix and contact with the wastewater, forming a flocculation reaction and further breaking down the polymer.

[0087] After undergoing the mixed-flow reaction, the wastewater moves upward to the vortex reaction zone. Enhanced by the vortex generator 13, the flocs in the water swirl and are adsorbed, gradually forming large aggregates and continuously breaking down colloids in the water. It continues to move upward to the swirl reaction zone, where it undergoes a final mixing reaction with the smaller swirl reactions generated in the central part of the wastewater that initially entered through the swirl reaction. Through this reaction, the suspended solids in the wastewater are ultimately converted into large aggregates, i.e., scum.

[0088] Scum accumulates in the scum zone at the top of the central cylinder 14 and is discharged from the device through the scum discharge pipe 4. Waste gas generated by the reaction in the central cylinder 14 is discharged through the exhaust pipe 5 for further treatment. Larger particles in the waste liquid settle downwards in the sludge discharge zone and are discharged through the main drain valve 19. The waste liquid, after scum removal and degumming, is discharged from the bottom of the central cylinder 14 and enters the double-stage laminar flow zone in the lower annular baffle plate 8 and upper annular baffle plate 7 for a second-stage laminar flow reaction. This further deflects and reacts with the remaining particles and suspended solids in the waste liquid, forming dense flocs. After laminar flow, the waste liquid proceeds to the settling zone, where it undergoes gravity settling through the inclined tube packing 16, ultimately removing any remaining flocs. The settled flocs are concentrated in the sludge discharge zone and discharged from the device through the drain branch valve 17. The settled waste liquid then enters the clear water zone and is discharged from the device through the effluent tank 15. A portion of the effluent is returned to the primary dissolved air pump 1 and the secondary dissolved air pump 18 for dissolved air flotation reaction.

[0089] This invention couples microbubble oxidation and depolymerization with multi-flow-state cascade flocculation, enhancing the depolymerization and coalescence separation effects of the eddy current field. It establishes a synergistic mechanism for rapid destabilization and separation of polymer waste liquid systems by flow state and microbubbles, forming a short-process polymer-containing waste liquid treatment system.

[0090] Based on the above-mentioned vertical flow coagulation and flotation integrated device, this embodiment of the invention also provides a method for treating operational wastewater, including the following steps:

[0091] S1. The first microbubbles generated by the first-stage dissolved air pump 1 are used to carry out a first-stage mixed flow reaction on the working waste liquid of the tubular reactor 2.

[0092] In this step, during the primary mixed-flow reaction, microbubbles come into full contact with suspended solids in the waste liquid, initiating the first flocculation reaction, forming fine flocs, and performing the initial depolymerization of the polymer.

[0093] S2, tubular reactor 2 transports the waste liquid from the first-stage mixed-flow reaction to the reaction cylinder component for flocculation reaction.

[0094] S3. When the waste liquid from the primary mixed-flow reaction undergoes flocculation in the reaction cylinder component, a second microbubble is generated by the secondary dissolved air pump 18 to carry out a secondary mixed-flow reaction on the waste liquid in the reaction cylinder component.

[0095] In this step, during the secondary mixed-flow reaction, the microbubbles in the high-speed dissolved air water in the mixed reaction zone are fully mixed and contacted with the waste liquid to form a secondary flocculation reaction and break down the polymer again.

[0096] S4. The waste liquid in the reaction cylinder component is separated into scum, waste gas, sludge and clean water through flocculation reaction and secondary mixed flow reaction.

[0097] The embodiments of this invention adopt a composite hydraulic reaction zone, which effectively shortens the flocculation reaction time. The main process uses physical methods to enhance the degumming, destabilization, and flocculation of the waste liquid. It does not increase the amount of reagents added for the treatment of complex waste liquids, thus reducing operating costs.

[0098] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vertical flow coagulation and air floatation integrated device, characterized in that, The device comprises a primary dissolved gas pump, a tubular reactor, a reaction cylinder component and a secondary dissolved gas pump. The tubular reactor is provided with a waste liquid inlet, a waste liquid outlet and a reactor dissolved gas water inlet, the primary dissolved gas pump is communicated with the reactor dissolved gas water inlet, the waste liquid outlet is communicated with the reaction cylinder component, and the reaction cylinder component is communicated with the secondary dissolved gas pump. The reaction cylinder component comprises an outer cylinder, a center cylinder and a water inlet pipe, the center cylinder is vertically arranged inside the outer cylinder, the center cylinder is concentrically arranged with the outer cylinder, the upper end of the outer cylinder is provided with a sealing cover for sealing the upper end of the outer cylinder and the center cylinder, the upper end surface of the center cylinder is higher than the upper end surface of the sealing cover, the water inlet is arranged on the side wall of the center cylinder below the sealing cover, the water outlet is arranged at the bottom of the center cylinder, the bottom of the outer cylinder is provided with a conical head, and the water outlet and the conical head have a certain gap; the reaction cylinder dissolved gas water inlet is arranged on the side wall of the center cylinder close to the water outlet, the waste liquid outlet is communicated with the center cylinder through the water inlet pipe, and the secondary dissolved gas pump is communicated with the reaction cylinder dissolved gas water inlet. The reaction cylinder component further comprises an upper annular baffle, a lower annular baffle, an inclined pipe filler and a skirt; the upper end of the skirt is fixedly connected with the outer side of the conical head, the lower annular baffle is arranged around the outer side of the center cylinder, the inner side of the lower annular baffle and the outer side of the center cylinder form a first cavity, the bottom of the lower annular baffle is connected with the inner side of the conical head, the upper end of the lower annular baffle has a certain gap with the inner wall of the sealing cover, the upper annular baffle is arranged around the outer side of the lower annular baffle, the inner side of the upper annular baffle and the outer side of the lower annular baffle form a second cavity, the outer side of the upper annular baffle and the inner wall of the outer cylinder form a third cavity, the upper end of the upper annular baffle is connected with the inner wall of the sealing cover, and the bottom of the upper annular baffle has a certain gap with the inner wall of the conical head; the inclined pipe filler is arranged in the third cavity. The reactor dissolved gas water inlet comprises two first dissolved gas water inlets, two second dissolved gas water inlets and two third dissolved gas water inlets, and the first dissolved gas outlet pipeline, the first dissolved gas branch, the second dissolved gas branch and the third dissolved gas branch are arranged between the primary dissolved gas pump and the reactor dissolved gas water inlet. The first end of the first dissolved gas branch is communicated with the two first dissolved gas water inlets, the first end of the second dissolved gas branch is communicated with the two second dissolved gas water inlets, the first end of the third dissolved gas branch is communicated with the two third dissolved gas water inlets, and the other end of the first dissolved gas branch, the second dissolved gas branch and the third dissolved gas branch are communicated with the primary dissolved gas pump through the first dissolved gas outlet pipeline. The dissolved gas water entering direction of the first dissolved gas branch, the second dissolved gas branch and the third dissolved gas branch is opposite to the water flow direction of the tubular reactor.

2. The integrated device according to claim 1, wherein The center cylinder comprises a conical top, a first straight cylinder segment, a conical segment and a second straight cylinder segment. The first straight cylinder section has an outer diameter larger than that of the second straight cylinder section, and the conical top section, the first straight cylinder section, the conical section, and the second straight cylinder section are sequentially connected from top to bottom.

3. The integrated device according to claim 2, wherein The inner wall of the first straight cylinder section is provided with a vortex generator.

4. The integrated device according to any one of claims 1 to 3, wherein The angle between the water inlet pipe and the horizontal plane is -5°-10°, and the center line of the water inlet pipe is tangent to the inner cylinder wall of the center cylinder.

5. The integrated device according to claim 2 or 3, wherein The reaction cylinder component further comprises a slag discharge pipe, an exhaust pipe, a water outlet groove, a sewage branch valve, and a sewage main valve. The slag discharge pipe is arranged on the side wall of the conical top section, the exhaust pipe is arranged on the upper end surface of the conical top section, the water outlet groove is arranged on the side wall of the outer cylinder above the inclined pipe filler, the sewage branch valve is arranged on the side wall of the conical head outside the lower annular baffle, and the sewage main valve is arranged on the outer side wall of the conical head below the water outlet.

6. The integrated device according to claim 2 or 3, wherein The reaction cylinder dissolved air water inlet comprises fourth, fifth, sixth, and seventh dissolved air water inlets arranged diagonally in pairs, and a second dissolved air outlet pipeline, fourth, fifth, sixth, and seventh dissolved air branches are arranged between the secondary dissolved air pump and the reaction cylinder dissolved air water inlet. One end of the fourth, fifth, sixth, and seventh dissolved air branches is in communication with the fourth, fifth, sixth, and seventh dissolved air water inlets, respectively, and the other end of the fourth, fifth, sixth, and seventh dissolved air branches is in communication with the secondary dissolved air pump through the second dissolved air outlet pipeline.

7. The integrated device according to claim 1, wherein The flow direction of the dissolved air water in the first, second, and third dissolved air branches is 30°-40° to the water flow direction in the tubular reactor.

8. The integrated device according to claim 6, wherein The fourth, fifth, sixth, and seventh dissolved air branches are 45°-60° to the vertical center line of the first straight cylinder section.

9. The integrated device according to claim 3, wherein The vortex generator has a "eagle beak" structure, and comprises a first arc surface at the rear end, a double-arc surface at the upper end, and a second arc surface at the lower end.

10. The integrated device according to claim 5, wherein The first and second dissolved air pumps are in communication with the water outlet groove.

11. A method for treating process waste liquid, characterized by, The vertical flow coagulation air floatation integrated device based on any one of claims 1-10 comprises the following steps: A first micro-bubble is generated by a first dissolved air pump to perform a primary mixed flow reaction on the working waste liquid in the tubular reactor; The tubular reactor delivers the working waste liquid after the primary mixed flow reaction to the reaction cylinder component for flocculation reaction; When the working waste liquid after the primary mixed flow reaction is subjected to flocculation reaction in the reaction cylinder component, a second micro-bubble is generated by a secondary dissolved air pump to perform a secondary mixed flow reaction on the working waste liquid in the reaction cylinder component; When the working waste liquid after the primary mixed flow reaction is subjected to flocculation reaction in the reaction cylinder component, a second micro-bubble is generated by a secondary dissolved air pump to perform a secondary mixed flow reaction on the working waste liquid in the reaction cylinder component; The waste liquid in the reaction cylinder component is separated into dregs, waste gas, sludge and clean water through flocculation reaction and secondary mixed flow reaction. The waste liquid in the reaction cylinder component is separated into dregs, waste gas, sludge and clean water through flocculation reaction and secondary mixed flow reaction.

Images