CN220149298U

CN220149298U - Jet type air floatation device and sewage treatment system

Info

Publication number: CN220149298U
Application number: CN202320808493.6U
Authority: CN
Inventors: 裴洁; 刘诗萱; 魏明月
Original assignee: Chongqing Kunquan Environmental Engineering Co ltd
Current assignee: Chongqing Kunquan Environmental Engineering Co ltd
Priority date: 2023-04-12
Filing date: 2023-04-12
Publication date: 2023-12-08
Anticipated expiration: 2033-04-12

Abstract

The utility model provides a jet type air floatation device and a sewage treatment system, and relates to the field of environmental protection equipment. The jet type air floatation device comprises an air floatation tank body, a slag collector, a vortex pump, a gas-liquid separator, an ejector and a releaser. The air floatation tank body is provided with a water inlet buffer zone, a jet aeration flotation zone and a water outlet balance stabilization zone which are sequentially communicated. The slag collector is arranged in the jet aeration flotation area and is used for filtering and collecting scum; the inlet of the vortex pump is communicated with the water outlet balance stable area; the inlet of the gas-liquid separator is communicated with the outlet of the vortex pump; the inlet of the ejector is communicated with the water outlet of the gas-liquid separator; the inlet of the releaser is communicated with the outlet of the ejector, and the outlet of the releaser is communicated with the jet aeration flotation zone. When the device operates, through the cooperation of gas-liquid separator, sprayer and releaser, can improve the slagging-off effect, can also improve resource utilization, reduce running cost.

Description

Jet type air floatation device and sewage treatment system

Technical Field

The utility model relates to the field of environmental protection equipment, in particular to a jet air floatation device and a sewage treatment system.

Background

Oil and gas field produced water typically contains some amount of oil, sulfide, organic phenol, cyanide, mercury, bacteria, solid particles, and other contaminants. Suspended matters and oil in oil and gas field produced water are two important factors causing blockage of a water injection well and an oil layer in oil and gas field produced water reinjection, and simple substance mercury, ionic mercury and organic mercury in the wastewater become important potential safety hazards in the oil and gas field produced water treatment process, and because mercury changes along with the change of environmental temperature, the mercury can appear in a solid state form at low temperature and can appear in a gaseous state form at a slightly higher temperature, so that the problems of oil removal, suspended matter removal and mercury removal of the oil and gas field produced wastewater become an important key technical problem in the oil and gas field produced water treatment process. The technical requirements for the sealing performance of the treatment equipment produced in the oil and gas field, and the removal rate of suspended matters, oil and mercury are quite high. The existing wastewater treatment system comprises an air floatation deslagging device.

The inventor researches show that the existing air floatation device has at least the following disadvantages:

the deslagging effect is poor.

Disclosure of Invention

The utility model aims to provide an injection type air floatation device and a sewage treatment system, which can improve the deslagging effect.

Embodiments of the present utility model are implemented as follows:

in a first aspect, the present utility model provides an ejector floatation device, comprising:

the air flotation tank body is provided with a water inlet buffer area, a jet aeration flotation area and a water outlet balance stabilization area which are sequentially communicated;

the slag collector is arranged in the jet aeration flotation area and is used for filtering and collecting scum;

the inlet of the vortex pump is communicated with the water outlet balance stable area;

the inlet of the gas-liquid separator is communicated with the outlet of the vortex pump;

the inlet of the ejector is communicated with the water outlet of the gas-liquid separator;

and the inlet of the releaser is communicated with the outlet of the ejector, and the outlet of the releaser is communicated with the jet aeration flotation zone.

In an alternative embodiment, the water inlet buffer area is provided with a first flowmeter, and the first flowmeter is used for acquiring the water inlet flow of the water inlet buffer area;

the water outlet balance stable area is provided with a second flowmeter, and the second flowmeter is used for obtaining the water outlet flow of the water outlet balance stable area.

In an alternative embodiment, the jet air flotation device further comprises a water inlet pump and a water outlet pump, wherein the water inlet pump is in communication connection with the first flowmeter, and the water outlet pump and the vortex pump are in communication connection with the second flowmeter, so that the water inlet flow and the water outlet flow are kept consistent.

In an alternative embodiment, a plurality of slag collectors are arranged, and the plurality of slag collectors are distributed in the jet aeration flotation area in the flow direction of water flow.

In an alternative embodiment, the ejector comprises a diffuser pipe, a reflecting plate, a throat pipe and a nozzle, wherein the diffuser pipe is provided with a first cavity section, a second cavity section and a third cavity section which are communicated in sequence, the inner diameter of the first cavity section gradually decreases in the direction from the first cavity section to the third cavity section, and the inner diameter of the third cavity section gradually increases in the direction from the first cavity section to the third cavity section; the reflecting plate is arranged at the end part of the first cavity section, which is far away from the second cavity section; the throat pipe is connected with the diffuser pipe, and is communicated with one end, far away from the second cavity section, of the third cavity section; the throat pipe is provided with an interface communicated with the water outlet of the gas-liquid separator; the nozzle is inserted into the throat pipe and connected with the throat pipe, and the nozzle is connected with the releaser.

In an alternative embodiment, the diffuser pipe is connected to the throat through a first flange structure; the throat pipe is connected with the nozzle by adopting a second flange structure.

In an alternative embodiment, the releaser comprises a release pipe, a slag discharging pipe and a spray head, wherein the release pipe is communicated with the spray nozzle; the slag discharging pipe is sleeved outside the releasing pipe, the first end of the slag discharging pipe is in sealing connection with the releasing pipe, and the second end of the slag discharging pipe is spaced from the pipe wall of the releasing pipe, so that the slag discharging pipe and the releasing pipe jointly define a slag discharging cavity; the slag discharging pipe is connected with the air floatation tank body, and the slag discharging cavity is communicated with the bottom of the jet aeration flotation zone; the spray head is communicated with the release pipe.

In an alternative embodiment, the number of the spray heads is multiple, a plurality of spray heads are all installed at one end of the release pipe, and the spray directions of the spray heads are different.

In an alternative embodiment, the number of the vortex pumps is a plurality, and a plurality of the vortex pumps are arranged in parallel.

In a second aspect, the present utility model provides a sewage treatment system comprising:

the jet flotation device of any one of the preceding embodiments.

The embodiment of the utility model has the beneficial effects that:

in summary, in the jet air flotation device provided in this embodiment, sewage is introduced into the water inlet buffer area, the sewage in the water inlet buffer area enters the jet aeration flotation area under the self-flowing action, the jet aeration flotation area is provided with the jet and the releaser, the jet and the releaser cooperate to jet bubbles into the jet aeration flotation area, oil, emulsion, fine suspended particles and organic fine silt in the sewage are wrapped by the bubbles, and scum is formed to float on the liquid surface. The scum is collected by the scum collector and is discharged in a concentrated mode under the action of gravity, purified sewage enters a water outlet balance and stabilization area under the action of gravity, part of sewage can be reinjected into a stratum to be mixed with stratum water, and due to good filtering effect of the sewage, less scum and water phase of the stratum are mixed, the phenomenon of hydration and expansion of clay mineral and new suspended matters are not generated, a water injection well and an oil layer are not easy to block, and the safety is high. Meanwhile, part of sewage enters the gas-liquid separator under the action of the vortex pump, part of waste gas is discharged, part of sewage and part of gas carried by the sewage enter the ejector together to form bubbles, the volume of the bubbles is reduced after passing through the releaser, and the bubbles enter the jet aeration flotation zone. And the recycling of resources is realized, and the running cost is low.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a jet air floatation device according to an embodiment of the present utility model;

FIG. 2 is a schematic flow chart of an injection type air floatation device according to an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of an injector according to an embodiment of the present utility model;

FIG. 4 is a schematic cross-sectional view of a release according to an embodiment of the present utility model;

fig. 5 is an isometric view of a release according to an embodiment of the utility model.

Icon:

100-an air floatation tank body; 110-a water inlet flange; 120-a first water outlet flange; 130-a second water outlet flange; 200-a slag collector; 300-vortex pump; 400-a gas-liquid separator; 410-exhaust valve; 500-ejectors; 510-diffuser; 511-a first chamber section; 512-a second chamber section; 513-a third chamber section; 520-reflecting plate; 530-throat; 531-connecting ports; 540-nozzles; 550-a first flange structure; 560-a second flange structure; 600-releaser; 610-release tube; 620-a slag discharging pipe; 630-spray head; 640-a slag discharging cavity; 700-deslagging pipeline.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1-5, the present embodiment provides an injection type air floatation device, which can improve the deslagging effect, improve the resource utilization rate and reduce the operation cost through the cooperation of the gas-liquid separator 400, the injector 500 and the releaser 600.

Referring to fig. 1 and 2, in the present embodiment, the jet air floatation device includes an air floatation tank 100, a slag collector 200, a vortex pump 300, a gas-liquid separator 400, an ejector 500, and a releaser 600. The air floatation tank body 100 is provided with a water inlet buffer zone, a jet aeration flotation zone and a water outlet balance stabilization zone which are communicated in sequence. The slag collector 200 is arranged in the jet aeration flotation area and is used for filtering and collecting scum; the inlet of the vortex pump 300 is communicated with the water outlet balance stable area; the inlet of the gas-liquid separator 400 communicates with the outlet of the vortex pump 300; the inlet of the ejector 500 is communicated with the water outlet of the gas-liquid separator 400; the inlet of the releaser 600 communicates with the outlet of the eductor 500 and the outlet of the releaser 600 communicates with the jet aeration flotation zone.

In view of the above, the working flow of the jet air floatation device provided in this embodiment is as follows:

the sewage is introduced into the water inlet buffer zone through the water inlet pump, and the sewage in the water inlet buffer zone enters the jet aeration flotation zone under the self-flowing action. The jet aeration flotation zone is provided with a jet 500 and a releaser 600, the jet 500 and the releaser 600 cooperate to jet bubbles into the jet aeration flotation zone, oil, emulsion, fine suspended particles and organic fine sludge in the sewage are wrapped by the bubbles, and scum is formed to float on the liquid surface. The scum passes through the slag collector 200 under the self-flowing action, the scum is collected by the slag collector 200 and is discharged in a concentrated way, the filtered sewage enters a water outlet balance and stabilization area under the self-flowing action, part of sewage can be reinjected into the stratum and mixed with stratum water, and the scum is less in filtering effect due to the fact that the filtering effect of the sewage is good, the phenomenon of hydration and expansion of clay mineral and new suspended matters cannot be generated after the scum is mixed with the stratum water, a water injection well and an oil layer are not easy to block, and the safety is high. Meanwhile, part of sewage enters the gas-liquid separator 400 under the action of the vortex pump 300, part of waste gas is discharged, part of sewage and part of gas carried by the sewage enter the ejector 500 together to form bubbles, the bubbles reduce in volume after passing through the releaser 600 and enter the jet aeration flotation zone, and the treatment effect can be improved by combining the bubbles with oil, emulsion, fine suspended particles and organic fine silt in the sewage better due to small volume of the bubbles. And the recycling of resources is realized, and the running cost is low. Meanwhile, by setting the water outlet balance stable area, fluctuation is not easy to occur in the water outlet process, and the collection of scum by the scum device is not influenced, so that the scum device can stably operate, and the scum removing effect is improved.

The following exemplifies the detailed structure of the jet air flotation device provided in this embodiment:

in this embodiment, alternatively, the air-floating tank body 100 is a circular tank, and both ends of the air-floating tank body 100 are convex spherical shells. The inside of the air floatation tank body 100 is provided with a plurality of partition boards, and the partition boards are matched to divide the internal cavity of the air floatation tank body 100 into a water inlet buffer area, a jet aeration flotation area and a water outlet balance stabilization area. The water inlet buffer area, the jet aeration flotation area and the water outlet stable area are sequentially arranged in the length direction of the air flotation tank body 100. A water inlet flange 110 is arranged at one end of the air floatation tank body 100, and the water inlet flange 110 is communicated with a water inlet buffer zone. Meanwhile, a water inlet pump is connected with the water inlet flange 110, and the water inlet pump is provided with a flowmeter, so that the water inlet flow can be monitored. The other end of the air floatation tank body 100 is provided with a first water outlet flange 120 and a second water outlet flange 130, and the first water outlet flange 120 and the second water outlet flange 130 are communicated with a water outlet balance stable area. The first water outlet flange 120 is used to reinject water back into the formation through a pipe. The second water outlet flange 130 is in communication with the swirl pump via a pipe.

Optionally, flow meters are disposed at the first water outlet flange 120 and the second water outlet flange 130, so as to monitor the water outlet flow rate of the water outlet balance stable area. Specifically, the first water outlet flange 120 may be provided with a water outlet pump, and a flow meter is provided on a pipeline of the water outlet pump, and the flow meter can monitor the water outlet flow of the water outlet pump. Correspondingly, the swirl pump can be provided with a flowmeter, so that the water outlet flow can be monitored, and the water outlet flow of the water outlet balance stable area is the sum of the water outlet flows of the water outlet pump and the swirl pump. In the actual operation process, the inlet water flow and the total outlet water flow are basically consistent through the monitoring of the flowmeter.

Referring to fig. 2, in this embodiment, optionally, the number of slag collectors 200 is plural, for example, in this embodiment, the number of slag collectors 200 may be six, where four slag collectors 200 are a first group, all slag collectors 200 of the first group are installed in the jet aeration flotation zone, the remaining two slag collectors 200 are a second group, and two slag collectors 200 of the second group are installed in the water outlet balance stabilization zone. So designed, the four slag collectors 200 of the first group form a first-stage slag collection, and the two slag collectors 200 of the second group form a second-stage slag collection, so that the slag collection effect is greatly improved. Specifically, after the waste residues in the jet aeration flotation area float, the first filtering is realized under the action of the four residue collectors 200 in the first group, the filtered sewage enters the water outlet balance stabilization area, and the intercepted waste residues are discharged from the residue discharge pipeline 700. After the sewage enters the water outlet balance and stabilization area, the sewage is filtered again under the action of the two slag collectors 200 of the second group, so that the slag removal effect is greatly improved.

In the present embodiment, the slag collector 200 may be directly configured in a known manner, and the specific description thereof is omitted in the present embodiment.

In this embodiment, alternatively, the number of the vortex pumps 300 is two, the two vortex pumps 300 are arranged in parallel, one of the two vortex pumps 300 operates as a standby when in operation, and after the initially operated vortex pump 300 fails, the other vortex pump 300 is started, so that shutdown is avoided, non-shutdown maintenance and repair can be realized, efficiency is improved, and loss is reduced. The inlet of each vortex pump 300 is connected to the second water outlet flange 130 and the outlet is connected to the inlet of the gas-liquid separator 400.

In this embodiment, optionally, an exhaust valve 410 is disposed at the top of the gas-liquid separator 400, and part of the gas separated during the operation of the gas-liquid separator 400 may be exhausted from the exhaust valve 410. The remaining mixture of water and gas enters the eductor 500.

Referring to fig. 2 and 3, in the present embodiment, the number of the injectors 500 is optionally plural, for example, four injectors 500. The four ejectors 500 are all arranged in the jet aeration flotation area and are distributed at intervals in the length direction of the air flotation tank 100. Meanwhile, a plurality of isolation plates are arranged in the jet aeration flotation area, the tops of the isolation plates are communicated, and the adjacent isolation plates form an independent area, so that the four ejectors 500 are respectively located in a corresponding area, the four ejectors 500 do not interfere with each other, and scum generated in the operation process can be smoothly cleaned by the corresponding slag collector 200. Correspondingly, the number of the releasers 600 is four, and the four releasers 600 are respectively matched with the four ejectors 500 in a one-to-one correspondence.

Specifically, the ejector 500 includes a diffuser 510, a reflecting plate 520, a throat 530, and a nozzle 540. The diffuser 510 has a first chamber section 511, a second chamber section 512, and a third chamber section 513 that are sequentially connected, the inner diameter of the first chamber section 511 gradually decreases in the direction from the first chamber section 511 to the third chamber section 513, the second chamber section 512 is an equal-diameter section, the inner diameter of the third chamber section 513 gradually increases in the direction from the first chamber section 511 to the third chamber section 513, and simultaneously, the cross-sectional profiles of the first chamber section 511, the second chamber section 512, and the third chamber section 513 are all circular. The reflective plate 520 is installed at an end of the first cavity section 511 remote from the second cavity section 512. The throat 530 is connected to the diffuser 510, and the throat 530 communicates with an end of the third chamber section 513 remote from the second chamber section 512. The throat 530 is provided with a connection port 531 communicating with the water outlet of the gas-liquid separator 400. The nozzle 540 is inserted into the throat 530 and connected with the throat 530, one end of the nozzle 540 is exposed outside the throat 530, and the end of the nozzle 540 exposed to the throat 530 is connected with the releaser 600 through a flange structure. It should be noted that, the throat 530 is provided with a first reducing section, the nozzle 540 is provided with a second reducing section, the second reducing section is inserted into the first reducing section, and the second reducing section is close to the third chamber section 513. In operation, the water-gas mixture delivered from the gas-liquid separator 400 enters the throat 530 from the connection port 531, is pressurized to the lower reflecting plate 520 by downward movement, is blocked, moves upward to the nozzle 540, and is ejected from the nozzle 540 in the form of bubbles.

It should be appreciated that the diffuser 510 may be sealingly coupled to the throat 530 via the first flange structure 550; the throat 530 may be sealingly coupled to the nozzle 540 via a second flange structure 560.

Referring to fig. 4 to 5, the releaser 600 may optionally include a release pipe 610, a slag discharging pipe 620, and a spray head 630. The discharge tube 610 communicates with the nozzle 540; the deslagging pipe 620 is sleeved outside the release pipe 610, the first end of the deslagging pipe 620 is connected with the release pipe 610 in a sealing way, and the second end of the deslagging pipe 620 is spaced from the pipe wall of the release pipe 610, so that the deslagging pipe 620 and the release pipe 610 jointly define a deslagging cavity 640. The slag discharging pipe 620 is connected with the air flotation tank 100 through a flange structure, one end of the slag discharging cavity 640 is communicated with the bottom of the jet aeration flotation zone, and the other end of the slag discharging cavity 640 is connected with the slag discharging pipeline 700. The spray head 630 communicates with the discharge tube 610. Further, the number of the spray heads 630 is plural, the spray heads 630 are installed at one end of the discharge pipe 610 remote from the spray nozzle 540, and the spray directions of the spray heads 630 are different. Thus, when the air bubbles ejected from the ejector 500 enter the release tube 610 and are ejected from the plurality of nozzles 630, the inner diameter of the nozzle 630 is smaller than that of the release tube 610, the air bubbles are cut into smaller air bubbles when ejected from the nozzle 630, and the ejected air bubbles move in different directions, so that the air bubbles can be better combined with waste residues, oil quality and the like, and the treatment effect is improved. For example, in the present embodiment, the number of the ejection heads 630 is two, and the exit directions of the two ejection heads 630 are set at right angles. The non-floating waste residue in the jet aeration flotation zone enters the slag discharging pipe 700 from the slag discharging cavity 640 and is finally discharged.

The jet type air floatation device provided by the embodiment has at least the following advantages:

(1) the device has the advantages of no power slag discharge and good equipment tightness, the whole device is a tank type totally-enclosed system, no secondary pollution is caused, and the released gas is recycled and only needs to be supplemented with trace gas;

(2) the occupied area of the equipment is small, the residence time of the oil-containing produced water in the equipment is short, and the efficiency is high;

(3) the device has the advantages of reliable operation, low energy consumption, easy management, good operation, no moving parts in the device, low failure rate compared with other air flotation, and capability of saving the running cost and maintenance cost of movement;

(4) the high-efficiency ejector 500 has reasonable structure, reliable performance, large air intake, small particle size of generated micro-bubbles and good treatment effect;

(5) the oil and suspended matter removal effect is good, and the mercury removal rate is high;

(6) the internal structure is reasonable: in order to reduce the impact of water inlet and outlet on the flow state of water in the equipment, a water inlet buffer distribution area (anti-impact) and a water outlet horizontal stabilizing area (anti-vortex) are adopted in the air floatation tank, so that the uniformity and stability of water inlet and water outlet are ensured.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A jet air floatation device, comprising:

2. The jet flotation device of claim 1 wherein:

the water inlet buffer area is provided with a first flowmeter which is used for acquiring the water inlet flow of the water inlet buffer area;

3. The jet flotation device of claim 2 wherein:

the jet type air flotation device further comprises a water inlet pump and a water outlet pump, the water inlet pump is in communication connection with the first flowmeter, and the water outlet pump and the vortex pump are in communication connection with the second flowmeter, so that the water inlet flow and the water outlet flow are kept consistent.

4. The jet flotation device of claim 1 wherein:

the slag collector is provided with a plurality of slag collectors, and the slag collectors are distributed in the jet aeration flotation area in the flowing direction of water flow.

5. The jet flotation device of claim 1 wherein:

the ejector comprises a diffuser pipe, a reflecting plate, a throat pipe and a nozzle, wherein the diffuser pipe is provided with a first cavity section, a second cavity section and a third cavity section which are communicated in sequence, the inner diameter of the first cavity section gradually decreases in the direction from the first cavity section to the third cavity section, and the inner diameter of the third cavity section gradually increases in the direction from the first cavity section to the third cavity section; the reflecting plate is arranged at the end part of the first cavity section, which is far away from the second cavity section; the throat pipe is connected with the diffuser pipe, and is communicated with one end, far away from the second cavity section, of the third cavity section; the throat pipe is provided with an interface communicated with the water outlet of the gas-liquid separator; the nozzle is inserted into the throat pipe and connected with the throat pipe, and the nozzle is connected with the releaser.

6. The jet flotation device of claim 5 wherein:

the diffuser pipe is connected with the venturi through a first flange structure; the throat pipe is connected with the nozzle by adopting a second flange structure.

7. The jet flotation device of claim 5 wherein:

the releaser comprises a release pipe, a slag discharging pipe and a spray head, and the release pipe is communicated with the spray nozzle; the slag discharging pipe is sleeved outside the releasing pipe, the first end of the slag discharging pipe is in sealing connection with the releasing pipe, and the second end of the slag discharging pipe is spaced from the pipe wall of the releasing pipe, so that the slag discharging pipe and the releasing pipe jointly define a slag discharging cavity; the slag discharging pipe is connected with the air floatation tank body, and the slag discharging cavity is communicated with the bottom of the jet aeration flotation zone; the spray head is communicated with the release pipe.

8. The jet flotation device of claim 7 wherein:

the quantity of shower nozzles is a plurality of, and a plurality of the shower nozzles all install in the one end of release pipe, a plurality of the shower nozzle spray direction is different.

9. The jet flotation device of claim 1 wherein:

the number of the vortex pumps is multiple, and the vortex pumps are arranged in parallel.

10. A sewage treatment system, comprising:

the jet flotation device of any one of claims 1 to 9.