CN211620175U - Coagulation air flotation experiment system - Google Patents

Abstract

The utility model relates to the technical field of environmental engineering water treatment, and specifically discloses a coagulation and air flotation experiment system, which comprises a drug dosing and mixing system, a dissolved air flotation system, a coagulation air flotation reaction system and a solid-liquid separation system. The system includes PAM medicine box, PAM metering pump, PAM dosing pipe, PAC medicine box, PAC metering pump, PAC dosing pipe, acid-base medicine box, acid-base metering pump, acid-base dosing pipe, sewage tank, sewage inlet pipe , sewage pump and sewage pipe, dissolved air flotation system includes clean water tank, water inlet pipe, dissolved air pump, dissolved gas water pipe, gas flow meter and gas control valve, coagulation air flotation reaction system includes coagulation reaction column, adjustable stirring The solid-liquid separation system includes a solid-liquid separation column, a water level regulating valve, a clean water collection tank, a clean water collection pipe, a scum discharge pipe and a clean water discharge pipe. The utility model overcomes the problems of large floor space, high energy consumption, complicated management, blockage of fillers and large water loss.

Description

Coagulation air flotation experiment system

technical field

The utility model relates to the technical field of environmental engineering water treatment, in particular to a coagulation air flotation experiment system.

Background technique

With the rapid development of the economy, the large-scale water pollution caused by the excessive discharge of wastewater has caused serious deterioration of the ecological environment and has become an important factor restricting social and economic development. To this end, the state has strengthened the protection of the water environment, and at the same time strictly stipulated the standards for sewage discharge.

For advanced treatment of municipal or industrial water with small and medium water volume, such as industrial wastewater from small and medium-sized cities and towns sewage, petroleum, chemical industry, papermaking, leather, printing and dyeing, food, starch, or industrial park sewage, the construction period for new water treatment facilities or upgrades is relatively short. It will affect the normal operation of the project construction or industrial main body, and the construction area is relatively tight.

For the treatment of landscape river water, technologies such as constructed wetlands, membrane separation, coagulation filtration and air flotation, however, while ensuring the treatment effect, these technologies require a large area, high energy consumption, complex management, clogging of fillers, and water loss. Major disadvantages cannot be completely avoided.

Utility model content

The purpose of this utility model is to provide a coagulation-air flotation experiment system to overcome the problems of large footprint, high energy consumption, complex management, blockage of fillers and large water loss in the prior art sewage treatment devices.

In order to solve the above technical problems, the utility model provides a coagulation and air flotation experiment system, which includes a dosing mixing system, a dissolved air flotation system, a coagulation air flotation reaction system and a solid-liquid separation system;

The dosing mixing system includes a PAM medicine box, a PAM metering pump, a PAM dosing pipe, a PAC medicine box, a PAC metering pump, a PAC dosing pipe, an acid-base medicine box, an acid-base metering pump, an acid-base dosing pipe, and sewage tank, sewage inlet pipe, sewage pump and sewage pipe, the PAM medicine box is connected with the coagulation air flotation reaction system through the PAM metering pump and the PAM dosing pipe, and the water inlet of the sewage pump passes through the sewage The inlet pipe is connected to the sewage tank, the water outlet of the sewage pump is connected to the coagulation air flotation reaction system through the sewage pipe, and the PAC medicine tank is connected to the water tank through the PAC metering pump and the PAC dosing pipe. The sewage pipe is connected, and the acid-base medicine box is connected with the sewage pipe through the acid-base metering pump and the acid-base dosing pipe;

The dissolved air flotation system includes a clean water tank, a water inlet pipe, a dissolved gas pump, a dissolved gas water pipe, a gas flow meter and a gas control valve. The water inlet of the dissolved gas pump is connected to the clean water tank through a water inlet pipe. The air inlet of the gas pump is connected to the gas flow meter through a pipeline, the gas control valve is arranged on the pipeline between the dissolved gas pump and the gas flow meter, and the water outlet of the dissolved gas pump passes through the outlet. The dissolved air water pipe is connected with the coagulation air flotation reaction system;

The coagulation-air flotation reaction system includes a coagulation reaction column, an adjustable stirrer and a connecting pipe, the adjustable agitator is arranged on the coagulation reaction column, and the stirring part of the adjustable agitator is located in the Inside the coagulation reaction column, the coagulation reaction column is connected with the solid-liquid separation system through the connecting pipe;

The solid-liquid separation system includes a solid-liquid separation column, a water level adjustment valve, a clean water collection tank, a clean water collection pipe, a scum discharge pipe and a clean water discharge pipe. The clean water collection tank and the clean water collection pipe are both arranged inside the solid-liquid separation column, the lower end of the clean water collection pipe is located at the lower part of the solid-liquid separation column, and the upper end of the clean water collection pipe is connected to the clean water collection tank. The lower end of the scum discharge pipe is connected to the side wall of the upper part of the solid-liquid separation column, and the clean water collection tank is connected to the clean water tank through the clean water discharge pipe.

Preferably, the water inlet of the PAM metering pump is connected with a PAM medicine inlet pipe, the water inlet of the PAC metering pump is connected with a PAC medicine inlet pipe, and the water inlet of the acid-base metering pump is connected with an acid-base medicine inlet pipe.

Preferably, the PAM dosing pipe is connected to the coagulation reaction column through two branch pipes, and the two branch pipes are respectively provided with a first regulating valve for the PAM dosing inlet and a second regulating valve for the PAM dosing inlet.

Preferably, the sewage inlet pipe is provided with a regulating valve, and the sewage pipe is sequentially provided with a sewage outlet regulating valve, a sewage flow meter, a sewage outlet pipe regulating valve and a sewage pipe upper regulating valve.

Preferably, the water inlet pipe is provided with a water inlet control valve and a vacuum gauge, and the dissolved gas water pipe is sequentially provided with a water volume regulating valve, a dissolved gas water flowmeter, a pressure gauge, a water flow regulating valve and a dissolved gas water sampling valve .

Preferably, the dissolved gas water pipe is connected to the coagulation reaction column through two branch pipes, and the two branch pipes are respectively provided with a first regulating valve of the dissolved gas water inlet and a second regulating valve of the dissolved gas water inlet.

Preferably, the upper part of the clean water tank is provided with a clean water tank overflow pipe.

Preferably, the side wall of the coagulation reaction column is provided with a plurality of sampling valves with different heights.

Preferably, the side wall of the solid-liquid separation column is provided with a plurality of sampling valves with different heights.

The coagulation-air flotation experiment system of the utility model is composed of a dosing mixing system, a dissolved-air flotation system, a coagulation-air flotation reaction system and a solid-liquid separation system. To achieve the optimization of the coagulation-air flotation separation process, at the same time, the water level adjustment control is used in the scum discharge method to realize the variable water level slag discharge method, which is simple and convenient, the whole set of equipment occupies a small area, low investment, high efficiency, and is more convenient for diversification. Research and discussion on coagulation and air flotation treatment of sewage.

Description of drawings

FIG. 1 is a schematic structural diagram of a coagulation-air flotation experiment system according to an embodiment of the present invention.

In the figure, 1: PAM medicine box; 2: PAM medicine inlet pipe; 3: PAM metering pump; 4: PAM medicine addition pipe; 5: PAM medicine inlet first regulating valve; 6: PAM medicine inlet second regulating valve ;7: PAC medicine box; 8: PAC medicine inlet pipe; 9: PAC metering pump; 10: PAC medicine addition pipe; 11: acid-base medicine box; 12: acid-base medicine inlet pipe; 13: acid-base metering pump; 14 : Acid-base dosing pipe; 15: Sewage pump; 16: Sewage inlet pipe; 17: Sewage outlet regulating valve; 18: Sewage flow meter; 19: Sewage outlet pipe regulating valve; 20: Sewage pipe; 21: Adjustment on the sewage pipe valve; 22: sewage tank; 23: coagulation reaction column; 24: adjustable stirrer; 25: sampling valve; 26: clean water tank; 27: dissolved air pump; 28: water inlet pipe; 29: water inlet control valve; 30: Vacuum gauge; 31: Gas flow meter; 32: Gas control valve; 33: Water volume regulating valve; 34: Dissolved gas water flow meter; 35: Pressure gauge; 36: Water flow regulating valve; 37: Dissolved gas water sampling valve; 38: Dissolved gas water pipe; 39: Dissolved gas water inlet first regulating valve; 40: Dissolved gas water inlet second regulating valve; 41: Connecting pipe; 42: Solid-liquid separation column; 43: Water level regulating valve; 44: Please collect water pipe; 45: clear water collection tank; 46: clear water discharge pipe; 47: scum discharge pipe; 48: clear water tank overflow pipe.

Detailed ways

The embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "horizontal", "upper", "lower", "front", "rear", "left", "right", The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility. The novel and simplified description does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; may be mechanical connection or electrical connection; may be direct connection, or indirect connection through an intermediate medium, or internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

As shown in FIG. 1 , the coagulation-air flotation experiment system of this embodiment includes: a dosing and mixing system, a dissolved-air flotation system, a coagulation-air flotation reaction system, and a solid-liquid separation system.

The dosing mixing system includes: PAM medicine box 1, PAM metering pump 3, PAM dosing pipe 4, PAC medicine box 7, PAC metering pump 9, PAC dosing pipe 10, acid-base medicine box 11, acid-base metering pump 13, Acid-base dosing pipe 14, sewage tank 22, sewage inlet pipe 16, sewage pump 15 and sewage pipe 20, PAM medicine tank is connected with coagulation air flotation reaction system through PAM metering pump 3 and PAM dosing pipe 4, sewage pump 15 The water inlet of the PAC is connected to the sewage tank 22 through the sewage inlet pipe 16, the water outlet of the sewage pump 15 is connected to the coagulation air flotation reaction system through the sewage pipe 20, and the PAC medicine box 7 is connected to the sewage pipe through the PAC metering pump and the PAC dosing pipe 10. 20 is connected, and the acid-base medicine tank 11 is connected to the sewage pipe 20 through the acid-base metering pump 13 and the acid-base dosing pipe 14 . The water inlet of the PAM metering pump 3 is connected with the PAM medicine inlet pipe 2 , the water inlet of the PAC metering pump 9 is connected with the PAC medicine inlet pipe 8 , and the water inlet of the acid-base metering pump 13 is connected with the acid-base medicine inlet pipe 12 . The PAM dosing pipe 4 is connected to the coagulation reaction column 23 through two branch pipes, and the two branch pipes are respectively provided with a PAM dosing inlet first regulating valve 5 and a PAM dosing inlet second regulating valve 6 . The sewage inlet pipe 16 is provided with a regulating valve, and the sewage pipe 20 is sequentially provided with a sewage outlet regulating valve 17, a sewage flow meter 18, a sewage outlet pipe regulating valve 19 and a sewage pipe upper regulating valve 21.

Open the sewage inlet pipe 16, the sewage is sucked from the sewage tank 22 by the sewage pump 15, and the flow is controlled by the flow meter 18 and the valve 17 to enter the sewage pipe 20, and the coagulant, acid or alkali regulator are respectively passed through the metering pumps 9 and 13. The controlled suction is inhaled into the dosing pipes 10 and 14, and then enters the sewage pipe 20 together, so that the medicinal liquid is mixed with the sewage, and after mixing, it enters the coagulation air flotation system through the regulating valve 21, and the coagulant PAM is sucked into the PAM by the metering pump 3. In the dosing pipe 4, it is added to the coagulation air flotation system through the control of the first regulating valve 5 of the PAM dosing inlet and the second regulating valve 6 of the PAM dosing inlet. The coagulant PAC and pH adjuster are controlled by the metering pump and then output to the sewage pipe, so that the liquid medicine is mixed with the sewage. The last sewage enters the bottom end of the coagulation air flotation column through the regulating valve on the sewage pipe, and the coagulant PAM metering pump and the dosing regulating valve are controlled to be added to the two dosing points in the coagulation air flotation system respectively.

The dissolved air flotation system includes: a clean water tank 26, a water inlet pipe 28, a dissolved gas pump 27, a dissolved gas water pipe 38, a gas flow meter 31 and a gas control valve 32, and the water inlet of the dissolved gas pump 27 is connected to the clean water tank 26 through the water inlet pipe 28 , the air inlet of the dissolved gas pump 27 is connected with the gas flow meter 31 through the pipeline, the gas control valve 32 is arranged on the pipeline between the dissolved gas pump 27 and the gas flow meter 31, and the water outlet of the dissolved gas pump 27 passes through the dissolved gas water pipe 38 Connect with the coagulation air flotation reaction system. The water inlet pipe 28 is provided with a water inlet control valve 29 and a vacuum gauge 30, and the dissolved gas water pipe 38 is sequentially provided with a water volume regulating valve 33, a dissolved gas water flowmeter 34, a pressure gauge 35, a water flow regulating valve 36 and a dissolved gas water sampling valve 37. The dissolved gas water pipe 38 is connected to the coagulation reaction column 23 through two branch pipes, and the two branch pipes are respectively provided with a dissolved gas water inlet first regulating valve 39 and a dissolved gas water inlet second regulating valve 40 . The upper part of the clean water tank 26 is provided with a clean water tank overflow pipe 48 .

Open the water inlet control valve 29, open the dissolved air pump 27, suck the water in the clean water tank 26 into the pump body, and control it through the water inlet control valve 29 and the vacuum gauge 30, while the dissolved air pump controls the suction through the gas flow meter 31 and the gas control valve 32. Air, after the air is repeatedly cut by the dissolved air pump, the pressure is maintained in the range of 0.3-0.5Mpa, the pressure is displayed by the pressure gauge 35, the added amount is controlled by the dissolved air water flowmeter 34, and the dissolved air water sampling valve 37 is opened to observe the dissolved air effect. After closing, it is transported to the middle and lower parts of the coagulation and air flotation system by the dissolved gas water pipe 38, and a large number of fine bubbles are generated in the water through the dissolved gas and release system, so that they adhere to the solid or liquid particles in the wastewater whose density is close to that of water. , resulting in a state where the overall density is less than that of water, and relying on buoyancy to make it rise to the water surface, so as to achieve the purpose of solid-liquid or liquid-liquid separation. The water inlet pipe of the dissolved air pump is connected to the bottom of the clean water tank, and the flow rate is controlled by the water inlet control valve. There is an air intake nozzle on the inhalation pipeline of the dissolved air pump at a position parallel to it. The air is quantified by the air inlet flowmeter and the regulating valve, and the air is repeatedly cut by the dissolved air pump. Then, disperse the gas and dissolve it into the water, and keep the pressure in the range of 0.2-0.3Mpa. The dissolved gas water outlet pipe is connected to the dissolved gas water flowmeter, water flow regulating valve, pressure gauge, and dissolved gas water sampling valve. The dissolved gas water inlet first regulating valve or the dissolved gas water inlet second regulating valve passes the dissolved gas water into the coagulation air flotation reaction column.

The coagulation air flotation reaction system includes: a coagulation reaction column 23, an adjustable agitator 24 and a connecting pipe 41, the adjustable agitator 24 is arranged on the coagulation reaction column 23, and the stirring part of the adjustable agitator 24 is located in the coagulation reaction Inside the column 23 , the coagulation reaction column 23 is connected to the solid-liquid separation system through the connecting pipe 41 . The side wall of the coagulation reaction column 23 is provided with a plurality of sampling valves 25 with different heights.

Start the mixer 24, open the valves 5 and 6, the regulating valve 21, the dissolved gas water inlet valve, the PAC mixture and the PAM liquid enter through the valve from the bottom and middle of the reaction column respectively, and the dissolved gas water is controlled by the control valve at the same time from the bottom of the column. And the middle part enters, at this time, the mixed liquid and the dissolved gas and water start to mix and react under the action of the stirrer 24. Through the action of the stirring rod and the stirring blade, the added medicine, water and gas can be added more quickly, evenly and effectively. Mixing to form a copolymer complex of larger bubbles and flocs, open the sampling valve 25 to observe the reaction state and effect of the upper, middle and lower positions in the reaction column, and the mixed liquid after the reaction flows into the upper part of the column through the connecting pipe 41 and the valve. Solid-liquid separation is performed in a solid-liquid separation system. The mixed liquid after dosing and mixing is introduced from the lower end of the coagulation reaction cylinder through the sewage pipe and valve, and the coagulation aid PAM is simultaneously introduced above the inlet, and the mixed water is fully mixed under the action of the agitator. Water is added into the system from the bottom of the coagulation reaction column through two inlet valves, and driven by the stirring machine, the stirring rod and the stirring blade make the added medicine, water and gas more quickly, uniformly and effectively mixed. , to form a copolymer complex of larger bubbles and flocs, and flow into the solid-liquid separation system through the connecting pipe and valve for solid-liquid separation; It can be controlled separately by the water inlet valve, and the reaction state and effect can be observed by the upper, middle and lower sampling valves.

The solid-liquid separation system includes: a solid-liquid separation column 42, a water level adjustment valve 43, a clean water collection tank 45, a clean water collection pipe 44, a scum discharge pipe 47 and a clean water discharge pipe 46, and the water level adjustment valve 43 is provided in the solid-liquid separation column 42. On the upper end, the clean water collection tank 45 and the clean water collection pipe 44 are all arranged inside the solid-liquid separation column 42, the lower end of the clean water collection pipe 44 is located at the lower part of the solid-liquid separation column 42, the upper end of the clean water collection pipe 44 and the lower end of the clean water collection tank 45. The scum discharge pipe 47 is connected to the upper side wall of the solid-liquid separation column 42, and the clean water collection tank 45 is connected to the clean water tank 26 through the clean water discharge pipe 46. The side wall of the solid-liquid separation column 42 is provided with a plurality of sampling valves with different heights.

Open the valve on the connecting pipe 41, and the incoming water enters the upper end of the solid-liquid separation column 42 through the connecting pipe 41. The density of the co-polymer complex of bubbles and flocs in the mixed liquid is relatively different from that of water, and the particle size is larger. It is much larger than the particles in the original sewage, and the density difference between the composite body and the water is large, and it will automatically rise to the liquid level in the separation column to form a scum layer, close the water level regulating valve 43, and the scum will pass through the scum after the liquid level rises. The discharge pipe 47 is discharged; and the separated clean water is collected in the clean water collection tank 45, and discharged into the clean water tank 26 through the clean water discharge pipe 46 to complete the solid-liquid separation operation. After the mixing and flocculation of the liquid medicine is completed, the mixed liquid that forms a copolymer complex of larger particle size bubbles and flocs enters the solid-liquid separation zone through the connection overflow. The connecting pipe enters the upper end of the solid-liquid separation column, and the mixed liquid enters the solid-liquid separation column. After the liquid separation column, the density of the copolymer complex of larger bubbles and flocs formed is larger than the density of water, and the particle size is much larger than the particles in the original sewage, which will automatically rise to the liquid surface of the separation column to form scum. The layer realizes rapid solid-liquid separation. After the scum closes the water level control valve above the clean water collection tank, the liquid level rises and the scum is discharged through the scum discharge pipe; the separated clean water is collected from the clean water collection pipe at the lower end of the separation column to the upper end. into the clean water collection tank, and then lead it into the clean water tank through the clean water discharge pipe.

The coagulation-air flotation experiment system of the utility model is composed of a dosing mixing system, a dissolved-air flotation system, a coagulation-air flotation reaction system and a solid-liquid separation system. To achieve the optimization of the coagulation-air flotation separation process, at the same time, the water level adjustment control is used in the scum discharge method to realize the variable water level slag discharge method, which is simple and convenient, the whole set of equipment occupies a small area, low investment, high efficiency, and is more convenient for diversification. Research and discussion on coagulation and air flotation treatment of sewage.

The coagulation-air flotation experiment system of the utility model adopts the coagulation-air flotation process, fully utilizes the basic principle of coagulation-air flotation, shortens the reaction separation time, improves the stability and floating capacity of the floating flocculation residue, and the effluent is controlled by water level adjustment. The scum is discharged from the separation column to realize the concentration and dehydration of the scum in the solid-liquid separation zone, which can further reduce the moisture content of the floc and greatly improve the separation efficiency and stability. Since the coagulation-air flotation process is suitable for various water quality and has good treatment effect, the coagulation-air flotation experimental system of the present invention can effectively remove the light flocs that are difficult to settle in the wastewater, and has large processing capacity, high efficiency and small footprint. ,Wide range of applications. At the same time, the coagulation and air flotation experimental system of the present utility model can be designed in various ways in advance. By controlling the opening and closing of the valve of the dosing system or the valve of the dissolved gas and water pipeline of the air flotation system, the effect of coagulation or air flotation alone can be studied. When using, you can select the corresponding method according to the corresponding processing state and effect. Integrating various water treatment facilities into one combination can facilitate transportation, reduce floor space, reduce dissolved gas energy consumption, improve treatment efficiency, and simplify process flow. In addition, the coagulation-air flotation experiment system of the present invention does not require a construction period, can be put into use immediately, and the overall investment is low.

The embodiments of the present invention are presented for purposes of illustration and description, and are not intended to be exhaustive or to limit the invention to the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to better explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for the design of various embodiments with various modifications as are suited to the particular use.

Claims (9)

1. a coagulation air flotation experiment system, is characterized in that, comprises dosing mixing system, dissolved air flotation system, coagulation air flotation reaction system and solid-liquid separation system; The medicine dosing and mixing system includes a PAM medicine box (1), a PAM metering pump (3), a PAM medicine addition pipe (4), a PAC medicine box (7), a PAC metering pump (9), and a PAC medicine addition pipe (10) , acid-base medicine tank (11), acid-base metering pump (13), acid-base dosing pipe (14), sewage tank (22), sewage inlet pipe (16), sewage pump (15) and sewage pipe (20) , the PAM medicine box is connected with the coagulation air flotation reaction system through the PAM metering pump (3) and the PAM dosing pipe (4), and the water inlet of the sewage pump (15) passes through the sewage inlet pipe (16) is connected to the sewage tank (22), the water outlet of the sewage pump (15) is connected to the coagulation air flotation reaction system through the sewage pipe (20), and the PAC medicine tank (7) The PAC metering pump and the PAC dosing pipe (10) are connected to the sewage pipe (20), and the acid-base medicine tank (11) is connected to the acid-base metering pump (13) and the acid-base dosing pipe ( 14) Connect with the sewage pipe (20); The dissolved air flotation system comprises a clean water tank (26), a water inlet pipe (28), a dissolved gas pump (27), a dissolved gas water pipe (38), a gas flow meter (31) and a gas control valve (32). The water inlet of the dissolved air pump (27) is connected to the clean water tank (26) through a water inlet pipe (28), and the air inlet of the dissolved air pump (27) is connected to the gas flow meter (31) through a pipeline, so The gas control valve (32) is arranged on the pipeline between the dissolved gas pump (27) and the gas flow meter (31), and the water outlet of the dissolved gas pump (27) passes through the dissolved gas water pipe (38). ) is connected with the coagulation air flotation reaction system; The coagulation-air flotation reaction system comprises a coagulation reaction column (23), an adjustable stirrer (24) and a connecting pipe (41), and the adjustable agitator (24) is arranged on the coagulation reaction column (23) ), the stirring part of the adjustable stirrer (24) is located inside the coagulation reaction column (23), and the coagulation reaction column (23) communicates with the solid-liquid through the connecting pipe (41). separate system connections; The solid-liquid separation system includes a solid-liquid separation column (42), a water level regulating valve (43), a clean water collection tank (45), a clean water collection pipe (44), a scum discharge pipe (47) and a clean water discharge pipe (46) , the water level regulating valve (43) is arranged on the upper end of the solid-liquid separation column (42), and the clean water collection tank (45) and the clean water collection pipe (44) are both arranged on the solid-liquid separation column (42) Inside, the lower end of the clean water collection pipe (44) is located at the lower part of the solid-liquid separation column (42), and the upper end of the clean water collection pipe (44) is connected with the lower end of the clean water collection tank (45), so The scum discharge pipe (47) is connected to the upper side wall of the solid-liquid separation column (42), and the clean water collection tank (45) is connected to the clean water tank (26) through the clean water discharge pipe (46) . 2. The coagulation-air flotation experiment system according to claim 1, wherein the water inlet of the PAM metering pump (3) is connected with the PAM medicine inlet pipe (2), and the PAC metering pump (9) The water inlet is connected with a PAC medicine inlet pipe (8), and the water inlet of the acid-base metering pump (13) is connected with an acid-base medicine inlet pipe (12). 3. The coagulation air flotation experiment system according to claim 1, wherein the PAM dosing pipe (4) is connected to the coagulation reaction column (23) through two branch pipes, and the two branch pipes are respectively A first regulating valve (5) for the PAM dosing inlet and a second regulating valve (6) for the PAM dosing inlet are provided. 4. The coagulation-air flotation experiment system according to claim 1, wherein the sewage inlet pipe (16) is provided with a regulating valve, and the sewage pipe (20) is sequentially provided with a sewage outlet regulating valve ( 17), sewage flow meter (18), sewage outlet pipe regulating valve (19) and sewage pipe upper regulating valve (21). 5. The coagulation-air flotation experiment system according to claim 1, wherein the water inlet pipe (28) is provided with a water inlet control valve (29) and a vacuum gauge (30), and the dissolved gas water pipe is provided with a water inlet control valve (29) and a vacuum gauge (30). (38) are sequentially provided with a water volume regulating valve (33), a dissolved gas water flowmeter (34), a pressure gauge (35), a water flow regulating valve (36) and a dissolved gas water sampling valve (37). 6. The coagulation air flotation experiment system according to claim 1, wherein the dissolved gas water pipe (38) is connected to the coagulation reaction column (23) through two branch pipes, and the two branch pipes are respectively connected to the coagulation reaction column (23). A first regulating valve (39) for the dissolved air and water inlet and a second regulating valve (40) for the dissolved gas and water inlet are provided. 7. The coagulation-air flotation experiment system according to claim 1, characterized in that, a clean water tank overflow pipe (48) is provided on the upper part of the clean water tank (26). 8. The coagulation-air flotation experiment system according to claim 1, characterized in that, a plurality of sampling valves (25) with different heights are provided on the side wall of the coagulation reaction column (23). 9 . The coagulation-air flotation experiment system according to claim 1 , wherein a plurality of sampling valves with different heights are arranged on the side wall of the solid-liquid separation column ( 42 ). 10 .

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