CN212532418U - Air stripping return-flow system and sewage treatment device - Google Patents

Abstract

The utility model relates to an air stripping reflux system and sewage treatment equipment, which comprises a riser for conveying reflux liquid and an air supply pipe for supplying air, wherein the riser is arranged vertically or obliquely; the gas stripping reflux system provided by the utility model has reasonable design, not only has high gas stripping reflux efficiency and saves electricity consumption, but also can effectively avoid the waste of gas, thereby effectively solving the defects existing in the prior art; in addition, the pipeline blockage can be effectively avoided, and the smoothness of system operation can be improved, so that the long-period stable operation of the system is kept.

Description

Air stripping return-flow system and sewage treatment device

Technical Field

The utility model relates to a sewage treatment device technical field, concretely relates to air stripping return-flow system and sewage treatment device.

Background

In the field of sewage treatment, a conventional sewage treatment system needs to carry out the reflux of nitrifying liquid or sewage mixed liquid to realize a complete pollutant removal process so as to achieve the aim of sewage treatment.

In the prior art, a gas stripping reflux system is usually adopted to realize reflux (such as reflux to a previous-stage sewage treatment unit) of reflux (nitrifying liquid or sewage mixed liquid), the existing gas stripping reflux system usually comprises a riser and an air supply pipe, the riser usually comprises a section of vertically (or obliquely) riser (or called a lifting section) and a horizontally arranged conveying pipe (or called a conveying section) for refluxing the reflux to the previous stage, one end of the air supply pipe is communicated with the riser, the other end of the air supply pipe is communicated with a fan (or an air pump), the fan supplies air to the riser through the air supply pipe, the reflux is driven by air to ascend along the riser, and the reflux returns to a previous stage through the conveying pipe, so that the purpose of gas stripping reflux is achieved.

However, the existing gas stripping reflux system usually has some disadvantages, 1, because the diameter of the pipeline of the gas supply pipe is large, the gas amount entering the riser is large, large bubbles are easily formed, the gas and reflux liquid are not favorably and fully mixed, on one hand, a large amount of gas is wasted, and on the other hand, the gas stripping efficiency is low. 2. As the reflux liquid usually contains sludge, the existing stripping reflux system is very easy to cause pipeline blockage.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to improve the not enough that exists among the prior art, provide an air stripping return-flow system, not only the air stripping backward flow is efficient, saves the power consumption, can effectively avoid gaseous waste moreover, in addition, can also effectively avoid the pipeline to block up, keeps the long period steady operation of system.

The utility model adopts the technical proposal that:

the gas stripping reflux system comprises a riser for conveying reflux liquid and a gas supply pipe for supplying gas, wherein the riser is arranged vertically or obliquely. In the scheme, the plurality of gas supply holes arranged in the gas supply pipe are communicated with the inner part of the flow channel of the lifting pipe, so that gas in the gas supply pipe can enter the lifting pipe through the gas supply holes in a relatively dispersed manner, and the gas can form fine bubbles in the lifting pipe, thereby effectively avoiding the defects that in the prior art, one end of the gas supply pipe is directly communicated with the lifting pipe, so that the gas forms large bubbles in the lifting pipe, the gas waste is caused, and the gas stripping backflow efficiency is low, and the fine bubbles are more favorable for being fully mixed with backflow liquid in the lifting pipe, thereby improving the backflow liquid lifting flow and achieving the purpose of improving the gas stripping backflow efficiency; the air supply hole air feed in this scheme of adoption, during the backward flow liquid is more difficult to get into the air supply pipe to can effectively avoid the air supply pipeline to block up, keep the long period steady operation of system.

Preferably, the area of the air supply hole is smaller than the cross-sectional area of the air supply flow passage inside the air supply pipe. So that the gas can relatively dispersedly enter the riser, and the gas entering the riser through the gas supply hole can form bubbles with smaller size, thereby being beneficial to improving the gas-liquid mixing degree in the riser and improving the lifting flow of the reflux.

Preferably, the air supply hole is a circular hole, a square hole or a strip hole. The shape of the air supply hole can be set according to the convenience of processing.

Preferably, when the air supply hole is a circular hole, the diameter of the air supply hole is 1-5 mm. The air supply hole is too small to be processed and molded conveniently, and the air supply hole is too large to be beneficial to forming tiny air bubbles, and the air supply hole is more suitable when 1-5mm is adopted.

To further avoid clogging, the gas supply holes are further provided at a position towards the side wall of the riser and/or at a position towards the lower end of the riser, respectively. Therefore, the blockage of the air supply hole can be effectively avoided, and particularly, the blockage of the air supply hole caused by the fact that backflow liquid, sludge and the like flowing backwards downwards along the lifting pipe enter the air supply pipe after air supply is stopped can be prevented.

Preferably, one end of the gas supply pipe is arranged in the inner flow passage of the riser, and the end is closed, and the gas supply hole is arranged on the side wall of the gas supply pipe.

In order to facilitate the assembly of the gas supply pipe, the gas supply pipe further comprises a connecting part, the connecting part comprises at least three connectors, a cavity is arranged in the connecting part, the connectors are respectively communicated with the cavity, the connecting part is arranged on the riser and is communicated with an internal flow channel of the riser through two connectors, and the gas supply pipe is inserted into the cavity through one connector. Therefore, the air supply hole arranged on the air supply pipe can be communicated with the cavity of the connecting part and further communicated with the internal flow channel of the riser, so that the purpose of air stripping reflux can be achieved, and the assembly and installation between the air supply pipe and the riser are more convenient.

Preferably, the connection part includes three ports, the three ports are respectively a first port, a second port and a third port, a cavity is disposed inside the connection part, and the first port, the second port and the third port are respectively communicated with the cavity, wherein the connection part is disposed on the riser and is communicated with an internal flow passage of the riser through the first port and the second port, and one end of the gas supply pipe is inserted into the cavity through the third port. In the scheme, the connecting part can be conveniently fixed in the lifting pipe through the first connector and the second connector, and the cavity is communicated with the internal flow channel of the lifting pipe so as to convey reflux liquid; one end of the air supply pipe can be conveniently inserted into the cavity through the third interface, so that the air supply pipe is communicated with the inner flow channel of the lifting pipe, the air supply pipe is fixed on the connecting part by welding or bonding, and the air supply pipe is sealed between the third interface and the air supply pipe, so that the air supply pipe is very convenient to assemble and is beneficial to efficiently finishing the air supply pipe.

Preferably, the connection part includes four ports, the four ports are respectively a first port, a second port, a third port and a fourth port, a cavity is disposed inside the connection part, and the first port, the second port, the third port and the fourth port are respectively communicated with the cavity, wherein the connection part is disposed on the riser and is communicated with an internal flow passage of the riser through the first port and the second port, and the air supply pipe is inserted into the cavity through the third port and extends out of the connection part through the fourth port. For connection to other locations where gas supply is required, such as to another riser, etc., for simultaneous gas supply to multiple risers.

Preferably, the connecting part is a tee or a cross.

The slag blocking device further comprises a slag blocking end, wherein a plurality of water passing holes are formed in the slag blocking end, the water passing holes are communicated with a water passing flow channel arranged inside the slag blocking end, the slag blocking end is fixed at the lower end of the lifting pipe, and the water passing flow channel is communicated with the internal flow channel.

For the convenience of later stage cleaning dregs in the dregs blocking end, the riser comprises a first pipe section and a second pipe section, one end of the first pipe section is connected with one end of the second pipe section through a detachable part, and the dregs blocking end is arranged at the other end of the first pipe section.

Preferably, the detachable member is a flange joint.

Preferably, the riser and/or the gas supply tube are round tubes or square tubes.

Further, still include the fan, the fan with the air supply pipe is linked together, and the air supply pipe is provided with and is used for the air regulation valve. In order to regulate the gas quantity.

A sewage treatment device comprises the air stripping reflux system.

Compared with the prior art, use the utility model provides a pair of air stripping return-flow system and sewage treatment device has following beneficial effect:

1. the gas stripping reflux system is reasonable in design, high in gas stripping reflux efficiency, electricity consumption is saved, waste of gas can be effectively avoided, and therefore the defects in the prior art are effectively overcome.

2. The gas stripping reflux system can effectively avoid pipeline blockage, and can improve the smoothness of system operation, so that the long-period stable operation of the system is kept.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of an air stripping reflux system provided in embodiment 1 of the present invention.

Fig. 2 is a partial cross-sectional view of fig. 1.

Fig. 3 is a schematic structural diagram of another gas stripping reflux system provided in embodiment 1 of the present invention.

Fig. 4 is a partial cross-sectional view of fig. 3.

Fig. 5 is a schematic structural diagram of an air stripping reflux system provided in embodiment 2 of the present invention.

Fig. 6 is a partial cross-sectional view of fig. 5.

Fig. 7 is a schematic structural diagram of another gas stripping reflux system provided in embodiment 2 of the present invention.

Fig. 8 is a partial cross-sectional view of fig. 7.

Description of the drawings

A riser 101, an internal flow passage 102, a transport pipe 103, a first pipe section 104, a second pipe section 105, a first riser pipe, a second riser pipe, a third riser pipe, a fourth riser pipe,

An air supply pipe 201, an air supply hole 202, an air regulating valve 203, a plug 204,

A detachable member 301,

A slag blocking end 401, a water through hole 402,

The connector comprises a connecting part 500, a first interface 501, a second interface 502, a third interface 503, a fourth interface 504 and a cavity 505.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as 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 present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

Referring to fig. 1 to 4, in the present embodiment, a gas stripping reflux system is provided, which includes a riser 101 for conveying reflux liquid and a gas supply pipe 201 for supplying gas, the riser 101 is vertically or obliquely disposed, an upper end of the riser 101 is connected to a delivery pipe 103, and the delivery pipe 103 is generally horizontally disposed, so as to guide the reflux liquid lifted from the riser 101 to a previous stage, thereby achieving the purpose of reflux;

in this embodiment, one end of the air supply pipe 201 is connected to a blower (or called as an air pump), and the blower is used to supply air into the air supply pipe 201, so that the air supply pipe 201 may be provided with an air adjustment valve 203 for adjusting air volume; the gas regulating valve 203 can quantitatively regulate the gas amount, so that the reflux flow is controlled, and the gas amount loss is reduced.

In the present embodiment, a part of the gas supply pipe 201 is disposed in the inner flow passage 102 of the riser 101, and the part of the pipe is provided with a plurality of gas supply holes 202; gas can enter the inner flow channel 102 of the riser 101 through the gas supply hole 202 and is rapidly mixed with the reflux liquid in the riser 101 to form gas-water mixed liquid, and due to the density difference, the mixed liquid is rapidly lifted to the conveying pipe 103 along the riser 101 and is discharged from the conveying pipe 103 to realize reflux; in this embodiment, the plurality of gas supply holes arranged in the gas supply pipe 201 are communicated with the inner flow channel 102 of the riser 101, so that the gas of the gas supply pipe 201 can relatively and dispersedly enter the riser 101 through the gas supply holes 202, and the gas can form fine bubbles in the riser 101, which not only can effectively avoid the problem that in the prior art, one end of the gas supply pipe 201 is directly communicated with the riser 101, so that the gas forms large bubbles in the riser 101, which causes the disadvantages of gas waste and low stripping reflux efficiency, but also the fine bubbles are more beneficial to being fully mixed with the reflux in the riser 101, thereby improving the reflux lifting flow of the reflux and achieving the purpose of improving the stripping reflux efficiency; the air supply hole 202 air feed in this scheme of adoption, during the reflux liquid more was difficult to get into air supply pipe 201 to can effectively avoid 201 ways of air supply pipe to block up, keep the long period steady operation of system.

In a preferred embodiment, the area of the air supply hole 202 is smaller than the cross-sectional area of the air supply flow passage inside the air supply pipe 201. So that the gas can relatively dispersedly enter the riser pipe 101, and the gas entering the riser pipe 101 through the gas supply holes 202 can form bubbles with smaller size, thereby being beneficial to improving the gas-liquid mixing degree in the riser pipe 101 and improving the lifting flow rate of the reflux liquid.

It is understood that the air supply hole 202 has various embodiments and may be provided according to the convenience of processing, and preferably, the air supply hole 202 may be a circular hole, a square hole or a bar hole. For example, in the present embodiment, the air supply holes 202 are circular holes, and each air supply hole 202 may be disposed in the air supply pipe 201 in a two-dimensional matrix or an equilateral triangle;

in order to form tiny bubbles of gas entering the riser 101, the size and number of the gas supply holes 202 can be generally set according to the size and number of the gas supply pipe 201, and in a preferred scheme, when the gas supply holes 202 are circular holes, the diameter of the gas supply holes 202 can be preferably set to be 1-5 mm; the air supply hole 202 is too small to be processed and molded conveniently, and the air supply hole 202 is too large to be beneficial to forming tiny air bubbles; it is understood that similar effects can be achieved when the diameter of the air supply hole 202 is greater than 5mm, and the description thereof is omitted.

To further avoid clogging, in a further aspect, the gas supply holes 202 are respectively disposed at a position toward a sidewall of the riser 101 and/or at a position toward a lower end of the riser 101. Therefore, the blockage of the air supply hole 202 can be effectively avoided, and particularly, the blockage of the air supply hole 202 caused by the fact that backflow liquid, sludge and the like flowing backwards downwards along the riser 101 enter the air supply pipe 201 after air supply is stopped can be prevented.

As a preferred embodiment, one end of the gas supply pipe 201 is disposed in (or extends into) the internal flow passage 102 of the riser 101, as shown in fig. 1 and fig. 2, in an embodiment, a side wall of the riser 101 is provided with an opening, and one end of the gas supply pipe 201 extends into the riser 101 through the opening, when the gas supply pipe 201 and the riser 101 are respectively metal pipes, the gas supply pipe 201 and the riser 101 can be integrally connected by welding, and the opening can be sealed, and when the gas supply pipe 201 and the riser 101 are respectively non-metal pipes, such as PVC pipes, the gas supply pipe 201 and the riser 101 can be integrally connected by bonding, and the opening can be sealed; to avoid gas being directly exhausted from the end of the gas supply pipe 201, in the present embodiment, the end of the gas supply pipe 201 is closed, such as by a plug 204 or an end plate, as shown in fig. 1 and 2; the gas supply holes 202 are respectively provided at the side walls of the gas supply pipe 201, specifically, as shown in fig. 2, in the present embodiment, the gas supply holes 202 are respectively provided at positions toward the side walls of the riser pipe 101 and the lower end of the riser pipe 101, as shown in fig. 2, thereby effectively preventing clogging.

As another embodiment, a part of the pipe section of the gas supply pipe 201 is disposed in the internal flow passage 102 of the riser 101, the part of the pipe section is provided with a plurality of gas supply holes 202, and an end of the gas supply pipe 201 is not disposed in the riser 101; for example, as shown in fig. 3 and 4, the air supply pipe 201 transversely passes through the internal flow channel 102 of the riser 101, and one end of the air supply pipe 201 is connected to a fan, and the other end is closed outside the riser 101, or connected to other positions where air supply is needed, such as another riser 101, so as to supply air to a plurality of risers 101 at the same time, which is not described herein again.

As shown in fig. 1 or fig. 3, in a further embodiment, the riser connector further includes a slag blocking end 401, the slag blocking end 401 is provided with a plurality of water passing holes 402, the water passing holes 402 are communicated with a water passing channel arranged inside the slag blocking end 401, the slag blocking end 401 is fixed at the lower end of the riser 101, and the water passing channel is communicated with the internal channel 102. The slag blocking end 401 can effectively intercept sundries at a water inlet end, and in practice, the size of the water passing hole 402 can be adjusted according to the size of the blocking objects or the filler, so that the blocking objects or the filler are prevented from entering the lifting pipe 101, and the lifting pipe 101 can be effectively prevented from being blocked.

In order to facilitate the later cleaning of the slag blocking tip 401, in a further embodiment, the riser 101 includes a first pipe segment 104 and a second pipe segment 105, one end of the first pipe segment 104 is connected with one end of the second pipe segment 105 through a detachable member 301, the slag blocking tip 401 is disposed at the other end of the first pipe segment 104, and one end of the gas supply pipe 201 is disposed at the second pipe segment 105; through setting up detachable component 301, can realize riser 101 and block dismantled being connected of sediment end 401 to conveniently dismantle and block sediment end 401, and clear up sediment end 401, like clearing up inside debris etc.. The detachable component 301 may have various embodiments, for example, in this embodiment, the detachable component 301 is a flange joint, as shown in fig. 1 or fig. 3, the flange joint includes two flanges that are matched with each other, the two flanges are respectively fixed to the first pipe segment 104 and the second pipe segment 105, and the detachable connection of the two flanges can be achieved by using a bolt pair, which is not described herein again.

It will be appreciated that in this embodiment, the riser 101 and/or the gas supply pipe 201 may preferably be circular or square pipes.

In the gas stripping reflux system provided by the embodiment, the slag blocking end 401 at the lower end of the riser 101 is immersed in liquid, and the riser 101 is vertically or obliquely arranged; the working process is as follows: after the blower is started, gas passes through the gas supply pipe 201 and is rapidly mixed with liquid in the return pipe through the gas supply hole 202 to form gas-water mixed liquid, and due to the density difference, the mixed liquid is rapidly lifted upwards along the lifting pipe 101 to the conveying pipe 103, and the return flow is realized; the slag blocking end 401 can block large impurities or fillers outside the riser 101, and the muddy water mixture with the diameter smaller than the water passing holes 402 can enter the riser 101, so that the impurities are prevented from blocking the pipeline; through the design, the gas stripping reflux efficiency can be effectively improved, the power consumption is saved, impurities in reflux liquid can be effectively intercepted from entering the lifting pipe 101, the system operation smoothness is improved, and the long-period stable operation of the system is ensured.

Example 2

The main difference between the present embodiment 2 and the above-mentioned embodiment 1 is that in the stripping reflux system provided in the present embodiment, a part of the pipe section of the gas supply pipe 201 is disposed in the cavity communicated with the internal flow passage 102 of the riser 101, and the part of the pipe section is provided with a plurality of gas supply holes 202. That is, in the present embodiment, the gas supply pipe 201 is not directly disposed in the internal flow passage 102 of the riser 101, but disposed in a cavity communicated with the internal flow passage 102 of the riser 101, and with such a design, not only the same technical effects as those of embodiment 1 can be achieved, but also the assembly of the whole gas stripping reflux system is facilitated.

As a preferred embodiment, the gas stripping reflux system further comprises a connecting part 500, the connecting part 500 comprises at least three connectors, a cavity 505 is arranged inside the connecting part 500, the connectors are respectively communicated with the cavities 505, the connecting part 500 is arranged on the riser 101 and is communicated with the internal flow channel 102 of the riser 101 through two connectors, the gas supply pipe 201 is inserted into the cavity 505 through one connector, so that the gas supply hole 202 arranged on the gas supply pipe 201 can be communicated with the cavity 505 of the connecting part 500 and further communicated with the internal flow channel 102 of the riser 101, and the purpose of gas stripping reflux is achieved;

as shown in fig. 5 and 6, as an embodiment, the connection part 500 includes three ports, the three ports are a first port 501, a second port 502 and a third port 503, a cavity 505 is disposed inside the connection part 500, the first port 501, the second port 502 and the third port 503 are respectively communicated with the cavity 505, wherein the connection part 500 is disposed on the riser 101 and is communicated with the internal flow passage 102 of the riser 101 through the first port 501 and the second port 502, and one end of the gas supply pipe 201 is inserted into the cavity 505 through the third port 503. Preferably, the first connector 501 and the second connector 502 may be symmetrically disposed on two sides of the cavity 505, as shown in fig. 6, the connecting member 500 may be conveniently fixed in the riser 101 through the first connector 501 and the second connector 502, and the cavity 505 is communicated with the internal flow passage 102 of the riser 101 so as to convey the return fluid, for example, the riser 101 may be composed of two pipe sections, and the two pipe sections are respectively connected with the first connector 501 and the second connector 502, for example, by a threaded connection, etc., so as to facilitate assembly; one end of the air supply pipe 201 can be conveniently inserted into the cavity 505 through the third interface 503, so that the air supply pipe 201 is communicated with the inner flow channel 102 of the riser 101, the air supply pipe 201 is fixed on the connecting part 500 by welding or bonding, and sealing is formed between the third interface 503 and the air supply pipe 201, so that convenience is brought to assembly of the air supply pipe 201 efficiently. Preferably, the connection member 500 may be a tee joint commonly used in the prior art, such as a tee joint having a T-shaped structure as shown in fig. 5 and 6, which is low in cost and convenient to install.

As shown in fig. 7 and 8, as another embodiment, the connection part 500 includes four ports, the four ports are respectively a first port 501, a second port 502, a third port 503 and a fourth port 504, a cavity 505 is disposed inside the connection part 500, the first port 501, the second port 502, the third port 503 and the fourth port 504 are respectively communicated with the cavity 505, the connection part 500 is disposed on the riser 101 and is communicated with the internal flow passage 102 of the riser 101 through the first port 501 and the second port 502, and one end of the gas supply pipe 201 is inserted into the cavity 505 through the third port 503. Preferably, the first connector 501 and the second connector 502 may be symmetrically disposed on two sides of the cavity 505, and the third connector 503 and the fourth connector 504 may be symmetrically disposed on two sides of the cavity 505, as shown in fig. 8, the connecting member 500 may be conveniently fixed in the riser 101 through the first connector 501 and the second connector 502, and the cavity 505 is communicated with the internal flow channel 102 of the riser 101, so as to convey the backflow liquid; one end of the air supply pipe 201 can be conveniently inserted into the cavity 505 through the third interface 503, and the connecting part 500 extends from the fourth interface 504, so that part of the air supply pipe 201 is positioned in the cavity 505, and finally, the air supply pipe 201 can be fixed to the connecting part 500 by welding or bonding, and sealing is formed between the third interface 503, the fourth interface 504 and the air supply pipe 201, which is very convenient and beneficial to efficiently finishing the assembly of the air supply pipe 201. Preferably, the connecting member 500 may be a four-way joint commonly used in the prior art, such as a four-way joint having a cross-shaped structure as shown in fig. 7 and 8, which is low in cost and convenient to install.

It is understood that when the connection component 500 includes more than four interfaces, the redundant interfaces are closed, and thus will not be described herein.

Example 3

A sewage treatment plant comprising the gas stripping reflux system described in example 1 or example 2 to effect reflux of nitrifying liquid or sewage mixed liquor.

For example, in this embodiment, the sewage treatment apparatus is an integrated sewage treatment apparatus, and includes a tank body, the tank body is provided with a water inlet pipe and a water outlet pipe, and apparatuses required for a sewage treatment process, including the gas return system, are all disposed in the tank body, so as to implement integrated sewage treatment.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention.

Claims (10)

1. The gas stripping reflux system comprises a riser for conveying reflux liquid and a gas supply pipe for supplying gas, wherein the riser is arranged vertically or obliquely, and the gas stripping reflux system is characterized in that part of the gas supply pipe is arranged in an internal flow passage of the riser and/or in a cavity communicated with the internal flow passage of the riser, and the part of the gas supply pipe is provided with a plurality of gas supply holes which are communicated with the internal flow passage of the riser by the aid of the gas supply holes arranged in the gas supply pipe.

2. The stripped recirculation system of claim 1, wherein the gas supply holes have an area that is smaller than a cross-sectional area of a gas supply flow passage inside the gas supply tube.

3. The stripped recirculation system of claim 1, wherein the gas supply holes are round, square or bar holes.

4. The stripped recirculation system of claim 1, wherein the gas supply holes are respectively disposed toward a sidewall of the riser and/or toward a lower end of the riser.

5. The gas stripping reflux system as set forth in any one of claims 1-4, wherein one end of the gas supply tube is disposed in the interior flow passage of the riser and the end is closed, or wherein the gas supply tube traverses the interior flow passage of the riser.

6. The gas stripping reflux system as claimed in any one of claims 1 to 4, further comprising a connecting member, wherein the connecting member comprises at least three connectors, a cavity is formed in the connecting member, the connectors are respectively communicated with the cavity, the connecting member is arranged in the riser and is communicated with the internal flow passage of the riser through two connectors, and the gas supply pipe is inserted into the cavity through one connector.

7. The gas stripping reflux system as set forth in claim 6, wherein the connecting member comprises three ports, the three ports are a first port, a second port and a third port, a cavity is disposed inside the connecting member, the first port, the second port and the third port are respectively communicated with the cavity, wherein the connecting member is disposed on the riser and is communicated with the internal flow passage of the riser through the first port and the second port, and one end of the gas supply pipe is inserted into the cavity through the third port;

or, the connecting part comprises four interfaces which are respectively a first interface, a second interface, a third interface and a fourth interface, a cavity is arranged in the connecting part, and the first interface, the second interface, the third interface and the fourth interface are respectively communicated with the cavity, wherein the connecting part is arranged on the lifting pipe and is communicated with an internal flow passage of the lifting pipe through the first interface and the second interface, and the air supply pipe is inserted into the cavity through the third interface and extends out of the connecting part through the fourth interface.

8. The gas stripping reflux system as claimed in any one of claims 1 to 4, further comprising a slag blocking end, wherein the slag blocking end is provided with a plurality of water passing holes, the water passing holes are communicated with a water passing channel arranged inside the slag blocking end, the slag blocking end is fixed at the lower end of the riser, and the water passing channel is communicated with the internal channel.

9. The air stripping reflux system as set forth in claim 8, wherein said riser comprises a first pipe section and a second pipe section, one end of said first pipe section is connected to one end of said second pipe section by a detachable member, and said slag trap tip is disposed at the other end of said first pipe section.

10. A wastewater treatment plant comprising the air stripping recirculation system of any of claims 1-9.

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