CN218478572U - Air floatation system suitable for electroplating wastewater treatment - Google Patents

Abstract

The technical field of electroplating wastewater treatment in this application relates to an air flotation system suitable for electroplating wastewater treatment, including a wastewater treatment platform, a dissolved air water generator, an air flotation pool and a sewage drain. The generator is connected with a dissolved air water delivery pipe, and the dissolved air water delivery pipe is connected with several dissolved air water discharge pipes. The dissolved air water discharge pipe includes a dissolved air water discharge port, which is set on one side of the air flotation tank, and the sewage The canal is fixedly connected to the side of the air flotation tank away from the dissolved air water discharge pipe, and the side of the sewage canal close to the dissolved air water discharge pipe is connected to a limited dam. There are two dissolved air water discharge outlets, both facing the sewage channel; The dissolved air water containing micro-bubbles produced by the device is discharged into the air flotation tank through the dissolved air water discharge pipe, and the electroplating wastewater in the air flotation tank fully reacts with the micro-bubbles to produce sludge. The sludge is driven by the water flow and flows into the sewage channel across the limit dam In order to realize the separation of sludge and electroplating wastewater.

Description

An air flotation system suitable for electroplating wastewater treatment

technical field

The application belongs to the technical field of electroplating wastewater treatment, and in particular relates to an air flotation system suitable for electroplating wastewater treatment.

Background technique

In the field of electroplating wastewater treatment, the electroplating wastewater containing metal ions is treated by chemical methods such as acid-base neutralization, redox and ferrite method to separate the metal ions and various highly toxic substances in the electroplating wastewater, and the electroplating wastewater needs to be put into Flocculant, so that the heavy metal ions in the electroplating wastewater can be completely precipitated into sludge in the form of hydroxide. The current technology to separate sludge and electroplating wastewater mainly adopts the air flotation method. The existing treatment equipment includes dissolved air water generators and The scraper, the connecting pipe of the water delivery pipe of the dissolved air water generator extends into the air flotation tank containing sludge, and discharges the dissolved air water, thereby releasing a large number of tiny air bubbles, which absorb the sludge particles and make the sludge particles float to the sewage. On the surface of the mud air flotation tank, the scraper scrapes the sludge on the surface to the sludge collection device. This type of equipment has a complicated structure and high maintenance costs.

Therefore, in view of the above-mentioned related technologies, the inventor believes that the existing air flotation wastewater treatment equipment has the problem of complicated structure of the sludge scraping device.

Utility model content

In order to simplify the structure and maintenance of the sludge scraping device, the application provides an air flotation system suitable for electroplating wastewater treatment.

The technical problem that this application needs to solve adopts following technical scheme to realize:

An air flotation system suitable for electroplating wastewater treatment, including a wastewater treatment platform, a dissolved air water generator, a dissolved air water discharge pipe, an air flotation tank for containing wastewater, and a sewage channel, and the air flotation tank is set on the top of the wastewater treatment platform , one end of the dissolved air water discharge pipe is connected to the dissolved air water generator, the dissolved air water discharge pipe is fixedly connected to one side of the inner wall of the air flotation tank, and the dissolved air water discharge pipe is provided with a dissolved air water discharge port , the discharge port of the dissolved air water is located in the air flotation tank, the sewage drain is fixedly connected to the side of the air flotation tank away from the dissolved air water discharge pipe, and the side of the sewage discharge channel close to the dissolved air water discharge pipe is fixedly connected to a limited dam , the opening of the dissolved air water outlet faces the sewage drain.

Through the above technical scheme, the wastewater treatment platform is used to install and support the dissolved air water generator, the dissolved air water delivery pipe and the sewage channel, and the air flotation pool is used as a reaction pool for the electroplating wastewater and the tiny bubbles in the dissolved air water, and the dissolved air water generates The device is used to generate and pump out dissolved air water rich in tiny bubbles; the dissolved air water generator pumps dissolved air water into the dissolved air water discharge pipe, and the dissolved air water discharge port discharges dissolved air water into the air flotation tank to make the dissolved air water The tiny air bubbles inside are adsorbed on the sludge particles of the wastewater in the air flotation tank, making the sludge particles float up to the surface of the wastewater. Since the opening of the dissolved air water discharge port faces the sewage ditch, the discharged dissolved air water drives the surface layer of the water flow to flow towards the sewage ditch. , when the liquid level of the wastewater in the air flotation tank rises higher than the top of the limit dam, the sludge floating on the surface of the air flotation tank will be driven by the water flow into the sewage drain, without using a special sludge scraping device, which simplifies the air flotation wastewater The structure of the treatment equipment reduces the maintenance workload of the air flotation wastewater treatment equipment.

Optionally, the number of the dissolved air water discharge pipes is several, and the arrangement direction of the several dissolved air water discharge pipes is arranged parallel to the length direction of the sewage drain.

Through the above technical scheme, the arrangement direction of several dissolved air water discharge pipes is arranged parallel to the length direction of the sewage channel, so that the dissolved air water rich in micro-bubbles can be discharged from the dissolved air water discharge ports of several dissolved air water discharge pipes, further expanding the The range of micro-bubbles adsorbing sludge particles is widened, and at the same time, the rate of water surface flow in the air flotation tank to the drainage tank is increased, thereby increasing the rate of separation of electroplating wastewater and sludge.

Optionally, the section of the dissolved air water discharge pipe located in the air flotation tank is U-shaped, and the dissolved air water discharge pipe is provided with a dissolved air water discharge port near the bottom of the air flotation tank, and the dissolved air water discharge pipe is located at Dissolved air water discharge outlets are arranged at the position limiting the height of the top of the dam.

Through the above technical scheme, the two dissolved air water outlets can both discharge dissolved air water containing tiny bubbles, and the dissolved air water outlet near the bottom of the air flotation tank has a larger flow rate of dissolved air water, so that the tiny bubbles can be more fully absorbed The sludge particles in the air flotation tank and the dissolved air water discharged from the dissolved air water outlet at the same height as the top of the limit dam are used to push the sludge on the surface of the air flotation tank to move towards the sewage drain.

Optionally, one end of the sewage drain is provided with a sewage outlet, the bottom of the sewage drain away from the sewage outlet is higher than the bottom at the sewage outlet, and the top of the limit dam is higher than the bottom of the sewage drain.

Through the above technical solution, when the liquid level of the air flotation tank is higher than the limit dam, the sludge is driven by the water flow into the sewage drain, which facilitates the sludge to flow along the sewage drain towards the sewage outlet under the action of its own gravity.

Optionally, one side of the air flotation tank is provided with a waste water inlet pipe, and the waste water inlet pipe is provided with a water inlet ram, and the side wall of the air flotation tank is fixedly connected with a hinge, and the hinge is located at the side of the waste water inlet pipe. The nozzle is close to the top of the air flotation pool, and the water inlet gate is rotatably connected to the side wall of the air flotation pool through a hinge.

Through the above technical scheme, the electroplating wastewater flows into the air flotation tank through the wastewater inlet pipe, and the water inlet gate is connected to the side wall of the air flotation tank through hinges. When the liquid level of the air flotation tank is high, the water pressure in the air flotation tank is higher than that in the waste water inlet pipe. When the water supply pressure is high, the water inlet gate blocks the wastewater inlet pipe under the action of the water pressure in the air flotation tank, thereby reducing the possibility of backflow of electroplating wastewater in the air flotation tank.

Optionally, the waste water inlet pipe is also provided with a water inlet valve, and the side of the air flotation tank away from the waste water inlet pipe is provided with a waste water outlet pipe, and the waste water outlet pipe is provided with a water outlet valve.

Through the above technical scheme, the water inlet valve is used to control whether the electroplating wastewater flows into the air flotation pool, and the flow rate of the electroplating wastewater into the air flotation pool. According to the flow rate of the floating tank, the staff can adjust the water inlet flow and outlet flow of the air flotation tank by adjusting the opening of the water inlet valve and the water outlet valve, so as to realize the effect of controlling the rise and fall of the wastewater level in the air flotation tank.

Optionally, the air flotation tank is connected with a return pipe, one end of the return pipe is connected to the bottom of the side wall of the air flotation tank near the sewage outlet, and the other end is connected to the dissolved air water generator.

Through the above technical scheme, the electroplating wastewater in the air flotation tank flows into the return pipe, and the dissolved air water generator pumps the electroplating wastewater in the return pipe into the dissolved air water generator as the water source of the dissolved air water generator, and then converts the water into Enriched with dissolved air water in the form of tiny bubbles.

Optionally, the dissolved air water generator is connected with a sewage pipe, and the end of the sewage pipe away from the dissolved air water generator is connected with a sewage drain.

Through the above technical scheme, there is still a small amount of sludge in the electroplating wastewater flowing from the return pipe into the dissolved air water generator, and the dissolved air water generator separates the small amount of sludge, and then discharges the sludge into the sewage drain through the sewage pipe.

In summary, the present application includes at least one of the following beneficial technical effects:

1. Compared with the traditional air flotation treatment system, the air flotation system suitable for electroplating wastewater treatment arranges several dissolved air water discharge pipes parallel to the length of the sewage drain, and all the dissolved air water discharge outlets face the sewage drain, one The dissolved air water discharge pipe is provided with two dissolved air water discharge ports, one dissolved air water discharge port is close to the bottom of the air flotation tank, the other dissolved air water discharge port is at the same height as the top of the limit dam, and all the dissolved air water discharge ports are discharged In the case of dissolved air water, the dissolved air water releases a large number of tiny bubbles to fully absorb the sludge particles in the electroplating wastewater, making the sludge particles float up, and at the same time, the sludge moves horizontally towards the sewage drain, and the sludge flows into the sewage drain across the limit dam. The sewage channel discharges the sludge, thereby separating the sludge particles in the electroplating wastewater.

2. Compared with the existing air flotation treatment system, the air flotation system suitable for electroplating wastewater treatment includes a limit dam. Only when the surface of the electroplating wastewater in the air flotation tank crosses the limit dam, the sludge will flow into the sewage with the electroplating wastewater In the ditch, the sludge is fully separated from the electroplating sewage.

3. Compared with the transmission air flotation treatment system, the air flotation system suitable for electroplating wastewater treatment contains fewer electrical components and lower maintenance costs.

Description of drawings

Fig. 1 is the structural representation of a kind of air flotation system suitable for electroplating wastewater treatment of the present embodiment;

Fig. 2 is the front view of a kind of air flotation system suitable for electroplating wastewater treatment of the present embodiment;

Fig. 3 is the sectional view of A-A cutting line among Fig. 2;

Fig. 4 is the sectional view of B-B cutting line among Fig. 2;

Fig. 5 is a top view of an air flotation system suitable for electroplating wastewater treatment according to the present embodiment;

Fig. 6 is a schematic structural view of some pipelines in the dissolved air water generator;

Fig. 7 is a partially enlarged view of part C in Fig. 1 .

Explanation of reference signs:

100. Wastewater treatment station; 1. Dissolved air water generator; 11. Air intake pipe; 12. Filter; 2. Dissolved air water delivery pipe; 3. Dissolved air water discharge pipe; 31. Dissolved air water discharge port; 4. Air flotation tank; 5, limit dam; 6, sewage channel; 61, sewage outlet; 7, waste water inlet pipe; 71, water inlet gate; 72, hinge; 73, water inlet valve; 731, water inlet valve cap; 732, water inlet Valve stem; 733, water inlet valve core; 8, waste water outlet pipe; 81, water outlet valve; 811, water outlet valve cap; 812, water outlet valve stem; 813, water outlet valve core; 9, return pipe; 10, sewage pipe.

Detailed ways

The present application will be described in further detail below in conjunction with accompanying drawings 1-7.

The embodiment of the present application discloses an air flotation system suitable for electroplating wastewater treatment, which includes fewer electrical components and has a simple structure, and is used to better separate sludge in electroplating wastewater by air flotation.

Referring to Fig. 1, Fig. 1 is a structural schematic diagram of an air flotation system suitable for electroplating wastewater treatment in an air flotation working state. The air flotation system suitable for electroplating wastewater treatment includes a wastewater treatment station 100, a dissolved air water generator 1, a dissolved air water Conveyor pipe 2, dissolved air water discharge pipe 3, air flotation tank 4, limit dam 5 and sewage channel 6, waste water treatment platform 100 is used to install and support dissolved air water generator 1, dissolved air water delivery pipe 2, dissolved air water Discharge pipe 3, limit dam 5 and sewage channel 6; air flotation tank 4 is opened on the top of waste water treatment platform 100, as microscopic air bubbles adsorbed on the reaction tank of sludge particles in electroplating wastewater, dissolved air water generator 1 is used to generate Dissolved air water with micro-bubbles, in this embodiment, micro-bubbles refer to bubbles with a diameter of 30um-50um; the air-dissolved water delivery pipe 2 is used to transport the air-dissolved water from the air-dissolved water generator 1 to the air-dissolved water discharge pipe 3. The air-dissolved water discharge pipe 3 is used to transport the dissolved air water to the bottom of the sewage liquid level in the air flotation tank 4 and release it, so as to drive the sludge in the sewage to float on the surface of the air flotation tank 4 and cross the limit dam 5 to flow into the sewage drain 6 , The sewage channel 6 is used to discharge sludge. In this embodiment, the wastewater treatment platform 100 is constructed of reinforced concrete. In other embodiments, the wastewater treatment platform 100 can also be constructed of high-strength glass or corrosion-resistant metal.

Referring to Fig. 2 and Fig. 3, one end of the air flotation tank 4 is provided with a waste water inlet pipe 7, and the waste water inlet pipe 7 introduces the electroplating wastewater after the flocculation treatment into the air flotation tank 4; The outlet pipe 8 and the waste water outlet pipe 8 discharge the electroplating waste water treated by the air flotation tank 4; Position, the mouth of the waste water inlet pipe 7 is provided with a water inlet gate 71, and the water inlet gate 71 is connected to the side wall of the air flotation pool 4 through a hinge 72. According to the principle of the connector, the electroplating waste water flows into the air flotation pool 4 through the waste water inlet pipe 7 Among them, when the liquid level in the air flotation tank 4 is higher than the previous wastewater treatment tank, the electroplating wastewater flows back, and because the water inlet ram 71 seals the wastewater inlet pipe 7, the electroplating wastewater cannot flow upward to a wastewater treatment tank, reducing the Possibility of backflow of electroplating waste water; optionally, in this embodiment, the waste water inlet pipe 7 is also provided with a water inlet valve 73, and the water inlet valve 73 includes a water inlet valve cap 731, a water inlet valve stem 732, a water inlet valve core 733, and a water inlet valve core 733 is located in the waste water inlet pipe 7, and a through hole is arranged in the water inlet valve core 733. When the water inlet valve core 733 rotates until the through hole of the water inlet valve core 733 communicates with the waste water inlet pipe 7, the electroplating wastewater flows into the air flotation pool 4. When the valve core 733 rotates until the water inlet valve core 733 blocks the wastewater inlet pipe 7, the electroplating wastewater cannot flow into the air flotation pool 4; one end of the water inlet valve rod 732 is fixedly connected to the water inlet valve core 733, and the other end is pierced with the wastewater treatment station 100 and extended To the top of the wastewater treatment station 100, the water inlet valve cap 731 is fixedly connected to the end of the water inlet valve rod 732 away from the water inlet valve core 733, and the staff rotates the water inlet valve cap 731, and the water inlet valve cap 731 drives the water inlet valve rod 732 to rotate synchronously, so that the water inlet valve The core 733 rotates to adjust the opening and closing state of the water inlet valve 73 and the flow rate of the waste water inlet pipe 7; the waste water outlet pipe 8 is provided with a water outlet valve 81, and the water outlet valve 81 includes an outlet valve cap 811, an outlet valve stem 812, and an outlet valve core 813. The water outlet valve core 813 is located in the waste water outlet pipe 8, and the water outlet valve core 813 is provided with a through hole. When the water outlet valve core 813 rotates until the through hole of the water outlet valve core 813 communicates with the waste water outlet pipe 8, the electroplating wastewater flows out of the air flotation pool 4. When the water outlet valve core 813 rotates until the water outlet valve core 813 blocks the waste water outlet pipe 8, the electroplating wastewater cannot flow out from the air flotation pool 4; one end of the water outlet valve rod 812 is fixedly connected to the water outlet valve core 813, and the other end is pierced with a waste water treatment station 100 And extend to the top of the wastewater treatment station 100, the outlet valve cap 811 is fixedly connected to the end of the outlet valve stem 812 away from the outlet valve core 813, the staff rotates the outlet valve cap 811, and the outlet valve cap 811 drives the outlet valve stem 812 to rotate synchronously, so that The water outlet valve core 813 rotates to adjust the opening and closing state of the water outlet valve 81 and the flow rate of the waste water outlet pipe 8; when the air flotation tank 4 is not injected with electroplating wastewater, the staff closes the water outlet valve 81, and then opens the water inlet valve 73 to make the electroplating wastewater From the waste water inlet pipe 7 into the air flotation pool 4, the liquid level of the electroplating wastewater in the air flotation pool 4 gradually rises, and the dissolved air water generator 1 is turned on to fully react the electroplating waste water with the tiny air bubbles in the dissolved air water, and the sludge gradually floats to the air flotation pool. The surface of the electroplating waste water in the floating pool 4, with reference to Fig. 1, when the liquid level rises to the liquid level of the electroplating waste water and crosses the limit dam 5, the sludge enters the sewage drain 6 with the water flow, when the liquid level of the electroplating waste water in the air flotation pool 4 When new sludge no longer floats, the staff opens the water outlet valve 81, so that the electroplating wastewater after treatment flows out of the air flotation tank 4 through the wastewater outlet pipe 8. Optionally, in other embodiments, the water outlet can also be driven by a motor Valve 81, and a liquid level detection device is set in the air flotation tank 4, which facilitates the automatic control of the switch state of the water outlet valve 81.

Referring to Fig. 4, one end of the sewage drain 6 is provided with a sewage outlet 61, and the bottom of the sewage drain 6 away from the sewage outlet 61 is higher than the bottom of the sewage outlet 61, and after the sludge enters the sewage drainage 6 with the water flow, it is subject to the force of its own gravity. The effect is to flow along the sewage channel 6 toward the sewage outlet 61, and finally flow out of the sewage channel 6 and enter the next system; the limit dam 5 is fixedly connected to the side of the sewage channel 6 close to the air flotation pool 4, and the top of the limit dam 5 is higher than the sewage channel 6, only when the liquid level of the air flotation tank 4 was higher than the limit dam 5, the sludge on the surface of the air flotation tank 4 could flow into the sewage drain 6.

5 and 6, the dissolved air water generator 1 is fixedly connected to the top plane of the waste water treatment station 100, to reduce the possibility of damage to the electrical equipment of the dissolved air water generator 1 exposed to water immersion or humid gas, The dissolved air water generator 1 is provided with an air intake pipe 11. In this embodiment, the air intake pipe 11 communicates with an air pump device (not shown in the figure) for supplying air to the dissolved air water generator 1; air flotation for electroplating wastewater treatment The system also includes a sewage discharge pipe 10 and a return pipe 9. One end of the dissolved air water delivery pipe 2 is connected to the dissolved air water generator 1, and the dissolved air water delivery pipe 2 is also connected to a dissolved air water discharge pipe 3, and the dissolved air water delivery pipe 2 It is used to transport the dissolved air water from the dissolved air water generator 1 to the dissolved air water discharge pipe 3; one end of the return pipe 9 is connected to the bottom of the air flotation tank 4, and is used to suck a small amount of electroplating wastewater at the bottom of the air flotation tank 4, and the other end is connected to the bottom of the air flotation tank 4. Dissolved air water generator 1, dissolved air water generator 1 pumps electroplating wastewater in return pipe 9 back to dissolved air water generator 1; return pipe 9 is connected to the water inlet of dissolved air water generator 1, dissolved air water generator 1 The water inlet is provided with a filter 12 for filtering sludge, and one end of the sewage pipe 10 is connected to the junction of the inner pipe of the dissolved air water generator 1 and the return pipe 9, and the other end is connected to the sewage channel 6, and the sewage pipe 10 will be The sludge filtered by the filter 12 is discharged into the sewage channel 6 .

Referring to Figure 1 and Figure 7, the dissolved air water discharge pipe 3 is fixedly connected to the side of the air flotation tank 4 away from the sewage drain 6, the dissolved air water discharge pipe 3 is arranged in a U-shaped section in the air flotation tank 4, and the dissolved air water discharge pipe 3 There are two dissolved air water discharge ports 31, both of which are facing the sewage channel 6, and one dissolved air water discharge port 31 is close to the bottom of the air flotation tank 4, for discharging dissolved air water, dissolved air water Release a large number of tiny bubbles, which are adsorbed on the sludge particles in the electroplating wastewater, making the sludge particles float up, so that the sludge of the electroplating wastewater in the air flotation tank 4 gathers on the surface; the setting of another dissolved air water discharge port 31 The height is flush with the top of the limit dam 5, and is used to discharge dissolved air water. The dissolved air water pushes the sludge on the surface of the electroplating wastewater in the air flotation tank 4 to flow towards the sewage drain 6. The number of dissolved air water discharge pipes 3 is several , a number of dissolved air water discharge pipes 3 are arranged at equal intervals, and the arrangement direction of the dissolved air water discharge pipes 3 is set parallel to the length direction of the sewage drain 6, which further expands the contact range between the dissolved air water and the electroplating wastewater, and makes the air flotation reaction more sufficient , while increasing the flow rate of the sludge towards the discharge channel, the air flotation system is suitable for treating a large amount of electroplating wastewater containing sludge.

The working principle and specific usage process of this application are as follows:

1. Turn the water outlet valve cap 811 to close the water outlet valve 81, turn the water inlet valve cap 731 to open the water inlet valve 73, so that the electroplating wastewater from the previous treatment pool flows into the air flotation pool 4 through the waste water inlet pipe 7, so that the liquid level of the air flotation pool 4 Gradually rise, a small amount of electroplating wastewater flows into the return pipe 9.

2. Turn on the dissolved air water generator 1, the high-pressure gas is pumped into the dissolved air water generator 1 from the intake pipe 11, and the dissolved air water generator 1 pumps the electroplating waste water in the return pipe 9 into the dissolved air water generator 1, so that The high-pressure gas is dissolved in the electroplating wastewater to generate dissolved air water. The dissolved air water generator 1 pumps the dissolved air water into the dissolved air water delivery pipe 2, and at the same time discharges a small amount of sludge in the electroplating wastewater through the sewage pipe 10 into the sewage ditch 6 middle.

3. The dissolved air water delivery pipe 2 transports the dissolved air water to the dissolved air water discharge pipe 3, and then sprays out from the dissolved air water discharge port 31. The dissolved air water releases a large number of tiny bubbles, which fully absorb the sludge in the electroplating wastewater Particles and sludge particles float up to the surface layer of the electroplating wastewater in the air flotation tank 4.

4. The sludge accumulated on the surface of the electroplating wastewater in the air flotation tank 4 is laterally driven by the dissolved air water, and the sludge accumulates towards the limit dam 5 .

5. When the liquid level of the air flotation tank 4 rises gradually until the electroplating wastewater crosses the limit dam 5, the sludge flows into the sewage channel 6, and the sewage channel 6 guides the sludge to flow into the next treatment system.

6. When the liquid level of the air flotation pool 4 was higher than that of the previous treatment pool, the water inlet gate 71 blocked the mouth of the waste water inlet pipe 7, so that the electroplating waste water was stopped from pouring in, so as to prevent the electroplating waste from entering the air flotation pool 4 Excessive waste water flow will reduce the quality of air flotation treatment.

7. Turn the water outlet valve cap 811 to open the water outlet valve 81 to adjust the flow of the wastewater outlet pipe 8, and discharge the electroplating wastewater treated by air flotation out of the air flotation pool 4.

8. Monitor the liquid level change of the air flotation pool 4, turn the water inlet valve cap 731 to control the opening of the water inlet valve 73, and turn the water outlet valve cap 811 to control the opening of the water outlet valve 81, so as to adjust the water inlet flow and the water outlet flow, so that the air flotation pool 4 The sludge inside can continue to flow into the sewage channel 6 across the limit dam 5 .

All of the above are preferred embodiments of the application, and are not intended to limit the protection scope of the application. Therefore, all equivalent changes made according to the structure, shape, and principle of the application should be covered by the protection scope of the application. Inside.

Claims (8)

1. An air flotation system suitable for electroplating wastewater treatment is characterized in that: it comprises a wastewater treatment station (100), a dissolved air water generator (1), a dissolved air water discharge pipe (3), and an air flotation system for containing the wastewater. Floating tank (4) and sewage drain (6), described air floating tank (4) is opened on the top of waste water treatment station (100), and one end of described dissolved air water discharge pipe (3) is communicated with dissolved air water generator (1) , the dissolved air water discharge pipe (3) is fixedly connected to one side of the inner wall of the air flotation tank (4), the dissolved air water discharge pipe (3) is provided with a dissolved air water discharge port (31), and the dissolved air water The water outlet (31) is located in the air flotation tank (4), and the sewage drain (6) is fixedly connected to the side of the air flotation tank (4) away from the dissolved air water discharge pipe (3), and the sewage drain (6) is close to One side of the dissolved air water discharge pipe (3) is fixedly connected with a limit dam (5), and the opening of the dissolved air water discharge port (31) faces the sewage drain (6). 2. A kind of air flotation system suitable for electroplating wastewater treatment according to claim 1, characterized in that: the number of the dissolved air water discharge pipes (3) is several, and some of the dissolved air water discharge pipes ( 3) The arrangement direction is set parallel to the length direction of the sewage drain (6). 3. A kind of air flotation system suitable for electroplating wastewater treatment according to claim 1, characterized in that: the section of the dissolved air water discharge pipe (3) located in the air flotation pool (4) is U-shaped, and the The dissolved air water discharge pipe (3) is provided with a dissolved air water discharge port (31) near the bottom of the air flotation tank (4), and the dissolved air water discharge pipe (3) is located at the height of the top of the limit dam (5). Dissolved air water discharge port (31) is arranged. 4. An air flotation system suitable for electroplating wastewater treatment according to claim 1, characterized in that: one end of the sewage drain (6) is provided with a sewage outlet (61), and the sewage drain (6) is far away from The drain bottom at one end of the sewage outlet (61) is higher than the drain bottom at the sewage outlet (61), and the top of the limit dam (5) is higher than the drain bottom of the sewage drain (6). 5. A kind of air flotation system suitable for electroplating wastewater treatment according to claim 1, characterized in that: one side of the air flotation tank (4) is provided with a waste water inlet pipe (7), and the waste water inlet pipe ( 7) An inlet gate (71) is provided, and the side wall of the air flotation tank (4) is fixedly connected with a hinge (72), and the hinge (72) is located at the mouth of the waste water inlet pipe (7) close to the air flotation tank (4) The top position, the water inlet gate (71) is rotatably connected to the side wall of the air flotation tank (4) through a hinge (72). 6. An air flotation system suitable for electroplating wastewater treatment according to claim 5, characterized in that: the wastewater inlet pipe (7) is also provided with a water inlet valve (73), and the air flotation pool (4) is far away from One side of the waste water inlet pipe (7) is provided with a waste water outlet pipe (8), and the waste water outlet pipe (8) is provided with a water outlet valve (81). 7. An air flotation system suitable for electroplating wastewater treatment according to claim 4, characterized in that: the air flotation tank (4) is connected with a return pipe (9), and one end of the return pipe (9) is connected to At the bottom of the side wall of the air flotation tank (4) near the sewage outlet (61), the other end is connected to the dissolved air water generator (1). 8. An air flotation system suitable for electroplating wastewater treatment according to claim 1, characterized in that: the dissolved air water generator (1) is connected with a sewage pipe (10), and the sewage pipe (10) One end of the channel away from the dissolved air water generator (1) is connected to the sewage drain (6).

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