Counter-current and co-current flow air flotation process system

Abstract

The present invention relates to the field of wastewater treatment, and in particular to a counter-current and co-current flow air flotation process system, comprising a chemical dosing zone, a counter-current contact zone, a co-current contact zone, a separation zone, and a clear liquid zone which are arranged in an air flotation tank. A wastewater inlet and a chemical dosing port are arranged at the bottom of the chemical dosing zone, and the chemical dosing port is provided with an electric valve; a stirrer and a fluorescence sensor are arranged in the chemical dosing zone; a counter-current flow dissolved air releaser is arranged at the bottom of the counter-current contact zone, a co-current flow dissolved air releaser is arranged at the bottom of the co-current contact zone, and high-pressure spray nozzles are correspondingly arranged above the counter-current flow dissolved air releaser and the co-current flow dissolved air releaser; and a reciprocating moving device is arranged above the top of the separation zone, and the reciprocating moving device is provided with an oil skimming plate that moves up and down. The present invention can automatically control the chemical dosing amount and ensure uniform mixing of the chemical solution. A mobile trolley can laterally move to filter out bubble-floc agglomerates. In addition, high-pressure water is sprayed from the high-pressure spray nozzles onto the surfaces of the dissolved air releasers to avoid clogging of the dissolved air releasers.

Description

A reverse and parallel flow air flotation process system Technical Field

[0001] This invention relates to the field of wastewater treatment, and more particularly to a reverse-flow air flotation process system. Background Technology

[0002] With the rapid development of global industry, the demand for petroleum is increasing, leading to a surge in oily wastewater generated by oil refineries. This oily wastewater is characterized by high emulsification, low levels of oil and suspended solids, increasing the difficulty of treatment and rendering traditional treatment technologies inadequate for meeting discharge requirements. Air flotation, due to its advantages of good treatment effect, low dosage, short residence time, and small footprint, is widely used. The principle of air flotation for oil removal is as follows: oily wastewater enters through the inlet, while a solution of coagulant and flocculant is introduced through the chemical inlet. The impeller rotates and stirs the solution, causing smaller diameter oil droplets and suspended solids (hereinafter referred to as flocs) to form larger diameter flocs. High-pressure dissolved air water is introduced into the contact zone, and low-pressure release through the dissolved air release device generates bubbles that combine with the flocculated oil droplets and suspended solids, forming flocs with a density less than water that float to the surface. A chain-driven skimming device scrapes the flocs into an oil storage tank, and the treated oily wastewater is discharged through the outlet.

[0003] For example, in the prior art: Chinese patent with publication number CN214611888U provides a new type of horizontal air flotation device; Chinese patent with publication number CN220845615U provides an air flotation sludge scraper; Chinese patent with publication number CN117843068A provides an air flotation machine with high dissolved air efficiency; Chinese patent with publication number CN221071108U provides an air flotation machine; Chinese patent with publication number CN117699897B provides an air flotation machine for sewage treatment and its working method; and US patent US01075250B2 provides a water treatment process for removing suspended solids by air flotation.

[0004] In the above-mentioned air flotation scheme: the dosage of the chemical cannot be increased according to the change in the amount of floc in the oily wastewater; the impeller does not stir the oily wastewater and the chemical evenly; the chain-driven oil skimming device is prone to failure, cannot adjust the oil skimming depth, and is only a one-way oil storage tank, which can only skim oil in one direction; the dissolved air release device is prone to clogging. Summary of the Invention

[0005] Based on the above problems, the purpose of this invention is to provide a reverse and parallel flow air flotation process system. The technical solution adopted by this invention is as follows:

[0006] This invention provides a reverse and parallel flow air flotation process system, including an air flotation unit housing. The air flotation unit housing is provided with, from left to right, a dosing zone, a reverse contact zone, a parallel contact zone, a separation zone, and a clear liquid zone. The top of the reverse contact zone communicates with the dosing zone, the bottom of the reverse contact zone communicates with the parallel contact zone, the top of the separation zone communicates with the parallel contact zone, and the bottom of the separation zone communicates with the clear liquid zone.

[0007] The bottom of the dosing area is provided with a sewage inlet and a dosing port, and an electric valve is provided on the dosing port; the dosing area is provided with a stirrer and a fluorescence sensor, and the fluorescence sensor is electrically connected to a first controller, which controls the opening and closing of the electric valve;

[0008] A reverse flow dissolved air release device is provided at the bottom of the reverse contact zone, and a parallel flow dissolved air release device is provided at the bottom of the parallel contact zone. Both the reverse flow dissolved air release device and the parallel flow dissolved air release device are connected to a high-pressure dissolved air water device. A high-pressure nozzle is provided above the reverse flow dissolved air release device and the parallel flow dissolved air release device, and the high-pressure nozzle is connected to the first water supply pipeline.

[0009] A reciprocating moving device is provided above the top of the separation zone, and a skimming plate device that moves up and down is provided on the reciprocating moving device; a left oil storage tank and a left pressure sensor are provided on the left side of the top of the separation zone, and a right oil storage tank and a right pressure sensor are provided on the right side of the top of the separation zone; both the left and right pressure sensors are electrically connected to a second controller, which controls the up and down movement of the skimming plate device; an inclined plate device is provided at the bottom of the separation zone.

[0010] A filter membrane device is installed in the clear liquid zone, and a clear water outlet is connected to the top of the clear liquid zone.

[0011] Preferably, the stirrer includes a drive motor, the power output shaft of the drive motor is connected to a rotating shaft, the rotating shaft is provided with a plurality of fixed rods, and the end of the fixed rod is provided with a rotatable impeller.

[0012] Preferably, a protective cover is provided above the high-pressure nozzle.

[0013] Preferably, the clean water outlet is connected to an automatic discharge valve via a pipe.

[0014] Preferably, the high-pressure dissolved air water device includes a dissolved air tank, which is connected to a gas storage tank through a gas channel. The dissolved air tank is connected to the clean water outlet through a second water supply pipeline. A water supply pump is installed on the second water supply pipeline. The dissolved air tank is connected to the reverse flow dissolved air release device and the forward flow dissolved air release device through a third water supply pipeline.

[0015] Preferably, the inlet end of the first water supply pipeline is connected to the second water supply pipeline, and the connection point between the first water supply pipeline and the second water supply pipeline is located downstream of the water supply pump; an overflow valve is provided on the second water supply pipeline.

[0016] Preferably, the reciprocating moving device includes a guide rail mounted above the separation zone, a moving trolley is mounted on the guide rail, and limit switches are provided at both ends of the guide rail.

[0017] Preferably, the skimming plate device includes a telescopic drive component, which is mounted on the mobile trolley, and the movable end of the telescopic drive component is connected to the skimming plate.

[0018] Preferably, the telescopic drive component is a cylinder.

[0019] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0020] This invention can automatically control the dosage of chemicals and fully stir the oily wastewater with the prepared coagulant and flocculant solution; the moving trolley can filter out flocculants by moving left and right; at the same time, high-pressure water is sprayed from the high-pressure nozzle onto the surface of the dissolved gas release device to avoid clogging of the dissolved gas release device. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 is a schematic diagram of the reverse and parallel flow air flotation process system of the present invention;

[0023] Figure 2 is a schematic diagram of the main structure of the stirrer of the present invention;

[0024] Figure 3 is a top view of the impeller arrangement on the rotating shaft of the present invention;

[0025] Figure 4 is a schematic front view of the reciprocating moving device and the skimming plate device of the present invention.

[0026] Figure 5 is a top view of the reciprocating moving device and the skimming plate device of the present invention.

[0027] Explanation of reference numerals in the attached drawings: 1. Flotation unit housing; 101. Dosing zone; 102. Reverse contact zone; 103. Convection contact zone; 104. Separation zone; 105. Clear liquid zone; 2. Wastewater inlet; 3. Dosing port; 4. Electric valve; 5. Agitator; 501. Drive motor; 502. Rotating shaft; 503. Fixing rod; 504. Impeller; 6. Fluorescent sensor; 7. First controller; 8. Reverse flow dissolved air release device; 9. Convection flow dissolved air release device; 10. High-pressure dissolved air water device; 1001. Dissolved air tank; 1002. Air duct; 1003. Air storage tank; 10 04. Second water supply pipeline; 1005. Water supply pump; 11. High-pressure nozzle; 12. First water supply pipeline; 13. Reciprocating moving device; 1301. Guide rail; 1302. Moving trolley; 1303. Limit switch; 14. Oil skimming plate device; 1401. Telescopic drive component; 1402. Oil skimming plate; 15. Left oil storage tank; 16. Left pressure sensor; 17. Right oil storage tank; 18. Right pressure sensor; 19. Second controller; 20. Inclined plate device; 21. Filter membrane device; 22. Clean water outlet; 23. Protective cover; 24. Automatic discharge valve; 25. Overflow valve. Detailed Implementation

[0028] To make the technical problems, technical solutions, and beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] As shown in Figure 1, this embodiment discloses a reverse and parallel flow air flotation process system, including an air flotation chamber 1. Multiple partitions are arranged in the air flotation chamber 1 from left to right, dividing the internal space of the air flotation chamber 1 into a dosing zone 101, a reverse contact zone 102, a parallel contact zone 103, a separation zone 104, and a clear liquid zone 105. The top of the reverse contact zone 102 is connected to the dosing zone 101, and the bottom of the reverse contact zone 102 is connected to the parallel contact zone 103. The top of the separation zone 104 is connected to the parallel contact zone 103, and the bottom of the separation zone 104 is connected to the clear liquid zone 105.

[0030] The bottom of the dosing zone 101 is equipped with a wastewater inlet 2 and a dosing port 3, with an electric valve 4 installed on the dosing port 3. The dosing zone 101 also includes a stirrer 5 and a fluorescence sensor 6. The fluorescence sensor 6 is electrically connected to a first controller 7, which controls the opening and closing of the electric valve 4. The bottom of the reverse contact zone 102 is equipped with a reverse flow dissolved air releaser 8, and the bottom of the forward contact zone 103 is equipped with a forward flow dissolved air releaser 9. Both the reverse flow dissolved air releaser 8 and the forward flow dissolved air releaser 9 are connected to a high-pressure dissolved air water device 10. High-pressure nozzles 11 are correspondingly installed above the reverse flow dissolved air releaser 8 and the forward flow dissolved air releaser 9, and the high-pressure nozzles 11 are connected to a first water supply pipeline 12. A reciprocating moving device 13 is installed above the top of the separation zone 104, and a skimming plate device 14 that moves up and down is installed on the reciprocating moving device 13. A left oil storage tank 15 and a left pressure sensor 16 are installed on the left side of the top of the separation zone 104, and a right oil storage tank 17 and a right pressure sensor 18 are installed on the right side of the top of the separation zone 104. Both the left pressure sensor 16 and the right pressure sensor 18 are electrically connected to a second controller 19, which controls the up and down movement of the skimming plate device 14. An inclined plate device 20 is installed at the bottom of the separation zone 104. A filter membrane device 21 is installed in the clear liquid zone 105, and a clear water outlet 22 is connected to the top of the clear liquid zone 105. The clear water outlet 22 is connected to an automatic discharge valve 24 through a pipe.

[0031] In this embodiment, a protective cover 23 is provided above the high-pressure nozzle 11.

[0032] In this embodiment, the high-pressure dissolved air water device 10 includes a dissolved air tank 1001, which is connected to a gas storage tank 1003 via a gas passage 1002. The dissolved air tank 1001 is connected to a clean water outlet 22 via a second water supply pipeline 1004. A water supply pump 1005 is installed on the second water supply pipeline 1004. The dissolved air tank 1001 is connected to a counter-current dissolved air release device 8 and a counter-current dissolved air release device 9 via a third water supply pipeline 1006.

[0033] In this embodiment, the inlet end of the first water supply pipeline 12 is connected to the second water supply pipeline 1004, and the connection position between the first water supply pipeline 12 and the second water supply pipeline 1004 is located downstream of the water supply pump 1005; an overflow valve 25 is provided on the second water supply pipeline 1004.

[0034] As shown in Figures 2 and 3, in this embodiment, the stirrer 5 includes a drive motor 501, which is mounted on the air flotation tank 1. The power output shaft of the drive motor 501 is connected to a rotating shaft 502. The rotating shaft 502 is provided with multiple fixing rods 503, and the ends of the fixing rods 503 are provided with rotatable impellers 504.

[0035] As shown in Figures 4 and 5, in this embodiment, the reciprocating moving device 13 includes a guide rail 1301 mounted above the separation zone 104, a moving trolley 1302 mounted on the guide rail 1301, and limit switches 1303 mounted at both ends of the guide rail 1301.

[0036] The oil skimming plate device 14 includes a telescopic drive component 1401, which is mounted on the mobile trolley 1302. The movable end of the telescopic drive component 1401 is connected to the oil skimming plate 1402. Specifically, the telescopic drive component 1401 can be a cylinder.

[0037] The processing procedure of this invention is as follows:

[0038] Oily wastewater enters the flotation tank 1 through the wastewater inlet 2. Simultaneously, the fluorescence sensor 6 emits fluorescence signals from the flocs in the oily wastewater under ultraviolet excitation. The first controller 7 processes fluorescence signals of different intensities and then sends a signal to the electric valve 4. The electric actuator in the electric valve 4 actuates, and the valve opens to the appropriate position. At the same time, the prepared coagulant and flocculant solution also enters the flotation tank 1 through the dosing port 3. The drive motor 501 of the agitator 5 rotates, driving the rotating shaft 502 to rotate. Then, the fixed rod 503 drives the impeller 504 to rotate, which fully stirs the oily wastewater and the prepared coagulant and flocculant solution. The small-diameter flocs in the oily wastewater undergo coagulation and flocculation reactions with the coagulant and flocculant to form larger-diameter flocs.

[0039] Next, the flocs enter the reverse contact zone 102 from the dosing zone 101. The high-pressure dissolved air water device 10 introduces high-pressure dissolved air water into the reverse flow dissolved air release device 8, which then enters the flotation tank 1. Since the flotation tank 1 is under low pressure, bubbles are released through the reverse flow dissolved air release device 8. In the reverse contact zone 102, the bubbles and flocs collide and contact, forming bubble flocs with a density less than that of water. Under the impact of the water flow, the bubble flocs and some flocs that have not been combined with microbubbles enter through the bottom of the reverse contact zone 102 and move towards the contact zone 103. Similarly, after the flocs enter and are directed to the contact zone 103, the high-pressure dissolved air water device 10 introduces high-pressure dissolved air water into the air flotation chamber 1. Since the air flotation chamber 1 is under low pressure, bubbles are released through the air flotation chamber 9 and then into the contact zone 103. The bubbles collide with the flocs to form bubble flocs with a density less than that of water. The bubble flocs and some flocs that are not combined with microbubbles pass through the top of the contact zone 103 and enter the separation zone 104.

[0040] In the reverse contact zone 102 and the forward contact zone 103, microbubbles and some flocs that are not bound to microbubbles adhere to each other and form flocs with a density less than that of water. The formed flocs float to the water surface. If the dissolved air release device (i.e., the reverse flow dissolved air release device 8 or the forward flow dissolved air release device 9) is blocked, the pressure in the water pipe between the dissolved air release device and the water supply pump 1005 increases, the overflow valve 25 opens, and the high-pressure water flowing from the water supply pump 1005 enters the high-pressure nozzle 11 through the overflow valve 25. The high-pressure water is sprayed from the high-pressure nozzle 11 onto the surface of the dissolved air release device (reverse flow dissolved air release device 8 or the forward flow dissolved air release device 9), and the blocked flocs are cleared away. Until the clogged flocs are cleared, the pressure in the water pipe between the dissolved air release device (reverse flow dissolved air release device 8 or parallel flow dissolved air release device 9) and the water supply pump 1005 decreases to a normal state, the overflow valve 25 closes, and the high-pressure water flowing out of the water supply pump 1005 no longer flows into the high-pressure nozzle 11 from the overflow valve 25.

[0041] In the upper part of the separation zone 104, a certain thickness of flocculent material is aggregated. The left pressure sensor 16, acting on the pressure of the flocculent material, sends a signal to the second controller 19. The second controller 19 processes the signal and, through the switching of the control valve group, controls the telescopic drive 1401 to move. The telescopic drive 1401, carrying the skimming plate 1402, moves downwards a certain distance. The motor on the moving trolley 1302 drives the moving trolley 1302 to move along the guide rail 1301. When the moving trolley 6 reaches the limit switch 1303 at the right end of the guide rail 1301, it stops. Simultaneously, the skimming plate 1402 pushes the flocculent material into the right oil storage tank 17, removing the flocculent material from the water. Similarly, the right pressure sensor 18, acting on the pressure of the flocculent material, sends a signal to the second controller 19. The second controller 19 processes the signal and, through the switching of the control valve group, controls the telescopic drive 1401 to move downwards, carrying the skimming plate 1402. The motor on the mobile trolley 1302 drives the mobile trolley 1302 to move along the guide rail 1301. When the mobile trolley 6 reaches the limit switch 1303 at the left end of the guide rail 1301, it stops. At the same time, the skimming plate 1402 pushes the flocculent material into the left oil storage tank 15, and the flocculent material in the water is removed.

[0042] The water sample treated by air flotation enters the inclined plate device 20. According to the principle of shallow pool, in the inclined plate device 20, because the density of the flocs is less than that of water, the flocs rise faster and sink faster. The flocs separated from the inclined plate device 20 are scraped off by the oil skimming plate 1402. The water that has passed through the inclined plate device 20 for secondary filtration enters the clear liquid zone 105. The filter membrane device 21 further intercepts the trace amounts of flocs and flocs that have not combined with microbubbles in the water, so that the oily wastewater meets the discharge requirements and flows out from the clear water outlet 22.

[0043] The clean water flowing from the clean water outlet 22 is partially pumped into the water supply pump 1005, and partially discharged into the river through the automatic discharge valve 24. The pressurized water from the water supply pump 1005 enters the dissolved air tank 1001. Methane is introduced from the air storage tank 1003 to dissolve the pressurized water, and then sent through the third water supply pipeline 1006 to the counter-current dissolved air release device 8 and the forward-current dissolved air release device 9. The dissolved air release device releases bubbles, which combine with flocs in the counter-current contact zone 102 and the forward-current contact zone 103, respectively. This process is repeated to treat oily wastewater.

[0044] It should be noted that both the first controller 7 and the second controller 19 can be controlled by a PLC.

[0045] Advantages or positive effects of the technical solution of the present invention:

[0046] (1) Automatic control of dosage. The fluorescence sensor 6 emits a fluorescence signal to the flocs in the oily wastewater under ultraviolet excitation. The first controller 7 processes the fluorescence signals of different intensities and then sends a signal to the electric valve 4. The electric actuator in the electric valve 4 is activated, and the valve opening is opened to a certain position. The precisely controlled coagulant and flocculant dosage enter the dosing zone 101 from the dosing port 3.

[0047] (2) The agitator 5 uses a multi-impeller agitation method, which has low agitation intensity and uniform agitation. The prepared coagulant and flocculant solution also enters the dosing zone 101 through the dosing port 3. The drive motor 501 rotates, which drives the rotating shaft 502 to rotate. Then the fixed rod 503 drives the small-diameter impeller 504 to rotate, which fully agitates the oily wastewater and the prepared coagulant and flocculant solution. The small-diameter flocs in the oily wastewater undergo a coagulation and flocculation reaction with the coagulant and flocculant to form larger-diameter flocs.

[0048] (3) The mobile trolley 1302 removes flocs efficiently during its reciprocating movement (the mobile trolley 1302 does not travel empty). Due to the presence of the left oil reservoir 15 and the right oil reservoir 17, the mobile trolley 1302 can filter out flocs when moving left and right; the left pressure sensor 16 and the right pressure sensor 18 detect the change in the thickness of the flocs, and the telescopic drive component 1401 adjusts the corresponding change so that the skimming plate 1402 is at a suitable height to scrape off and filter the flocs.

[0049] (4) The bubbles are guaranteed to be continuously and stably introduced, and the bubbles have a good adhesion effect with the flocs. At the same time, the dissolved air release device is not easy to be blocked. If the reverse flow dissolved air release device 8 or the parallel flow dissolved air release device 9 is blocked by flocs, the pressure in the water pipe between the water supply pump 1005 increases, the overflow valve 25 opens, and the high pressure water flowing out of the water supply pump 1005 enters the high pressure nozzle 11 through the overflow valve 25. The high pressure water is sprayed from the high pressure nozzle 11 onto the surface of the reverse flow dissolved air release device 8 or the parallel flow dissolved air release device 9, and the blocked flocs are cleared away.

[0050] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A reverse-flow air flotation process system, characterized in that: The system includes an air flotation unit (1), which is provided with a dosing zone (101), a reverse contact zone (102), a forward contact zone (103), a separation zone (104), and a clear liquid zone (105) arranged from left to right. The top of the reverse contact zone (102) is connected to the dosing zone (101), the bottom of the reverse contact zone (102) is connected to the forward contact zone (103), the top of the separation zone (104) is connected to the forward contact zone (103), and the bottom of the separation zone (104) is connected to the clear liquid zone (105). The bottom of the dosing zone (101) is provided with a sewage inlet (2) and a dosing port (3), and an electric valve (4) is provided on the dosing port (3); the dosing zone (101) is provided with a stirrer (5) and a fluorescence sensor (6), and the fluorescence sensor (6) is electrically connected to a first controller (7), which controls the opening and closing of the electric valve (4); A reverse flow dissolved air release device (8) is provided at the bottom of the reverse contact area (102), and a lateral flow dissolved air release device (9) is provided at the bottom of the lateral contact area (103). Both the reverse flow dissolved air release device (8) and the lateral flow dissolved air release device (9) are connected to the high pressure dissolved air water device (10). A high pressure nozzle (11) is provided above the reverse flow dissolved air release device (8) and the lateral flow dissolved air release device (9). The high pressure nozzle (11) is connected to the first water supply pipeline (12). A reciprocating moving device (13) is provided above the top of the separation zone (104), and a skimming plate device (14) that moves up and down is provided on the reciprocating moving device (13); a left oil storage tank (15) and a left pressure sensor (16) are provided on the left side of the top of the separation zone (104), and a right oil storage tank (17) and a right pressure sensor (18) are provided on the right side of the top of the separation zone (104); the left pressure sensor (16) and the right pressure sensor (18) are both electrically connected to a second controller (19), and the second controller (19) controls the skimming plate device (14) to move up and down; a sloping plate device (20) is provided at the bottom of the separation zone (104); A filter membrane device (21) is provided in the clear liquid zone (105), and a clear water outlet (22) is connected to the top of the clear liquid zone (105).

2. The reverse and parallel flow air flotation process system according to claim 1, characterized in that: The stirrer (5) includes a drive motor (501), the power output shaft of the drive motor (501) is connected to a rotating shaft (502), the rotating shaft (502) is provided with a plurality of fixed rods (503), and the end of the fixed rod (503) is provided with a rotatable impeller (504).

3. The reverse and parallel flow air flotation process system according to claim 1, characterized in that: A protective cover (23) is provided above the high-pressure nozzle (11).

4. The reverse and parallel flow air flotation process system according to claim 1, characterized in that: The clean water outlet (22) is connected to the automatic discharge valve (24) via a pipe.

5. The reverse and parallel flow air flotation process system according to claim 1, characterized in that: The high-pressure dissolved air water device (10) includes a dissolved air tank (1001), which is connected to a gas storage tank (1003) through a gas passage (1002). The dissolved air tank (1001) is connected to the clean water outlet (22) through a second water supply pipeline (1004). A water supply pump (1005) is installed on the second water supply pipeline (1004). The dissolved air tank (1001) is connected to the reverse flow dissolved air release device (8) and the forward flow dissolved air release device (9) through a third water supply pipeline (1006).

6. The reverse and parallel flow air flotation process system according to claim 5, characterized in that: The inlet end of the first water supply pipeline (12) is connected to the second water supply pipeline (1004), and the connection position between the first water supply pipeline (12) and the second water supply pipeline (1004) is located downstream of the water supply pump (1005); an overflow valve (25) is provided on the second water supply pipeline (1004).

7. The reverse and parallel flow air flotation process system according to claim 1, characterized in that: The reciprocating moving device (13) includes a guide rail (1301) mounted above the separation zone (104), a moving trolley (1302) is mounted on the guide rail (1301), and limit switches (1303) are mounted at both ends of the guide rail (1301).

8. The reverse and parallel flow air flotation process system according to claim 7, characterized in that: The skimming plate device (14) includes a telescopic drive (1401), which is mounted on the mobile trolley (1302). The movable end of the telescopic drive (1401) is connected to the skimming plate (1402).

9. The reverse and parallel flow air flotation process system according to claim 8, characterized in that: The telescopic drive component (1401) is a cylinder.

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