Industrial sewage treatment equipment and working method thereof

Abstract

The invention relates to industrial sewage treatment equipment and a working method thereof.The industrial sewage treatment equipment comprises a shell, a material storage box is fixedly installed in the middle of the inner wall of the shell, the bottom of the material storage box communicates with a liquid outlet pipe, a control valve is fixedly installed in the middle of the liquid outlet pipe, and a discharging mechanism used for feeding a flocculating agent is arranged below the liquid outlet pipe; a ventilation mechanism used for improving the oil floating efficiency is arranged on one side of the discharging mechanism. A driving motor is started to drive a rotating shaft to rotate, so that two stirring paddles stir and mix industrial sewage in an air floatation tank, meanwhile, a second belt pulley is matched with a belt to drive a first belt pulley to rotate, so that a discharging pipe and a discharging hopper rotate at the same time, and at the moment, a flocculating agent accumulated in the discharging hopper is discharged out of the air floatation tank due to the action of centrifugal force. And the flocculating agent is sprayed from the top of the discharging hopper and is put into the sewage close to the edge of the air floatation tank, so that the flocculating agent is in full contact with oil in the industrial sewage, and the flocculation effect and the pollutant removal rate are prevented from being reduced.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment equipment technology, specifically to an industrial wastewater treatment device and its working method. Background Technology

[0002] Industrial wastewater is sewage and waste liquid generated during industrial production processes. It contains a variety of pollutants and must be strictly treated to meet standards before it can be discharged. Industrial wastewater may contain oily substances, especially wastewater discharged from industries such as petroleum, chemical, textile, metal processing and food processing. These oily pollutants include natural petroleum, petroleum products, tar and its fractions. In the process of treating oil in industrial wastewater, a certain amount of flocculant needs to be added to the flotation tank. However, the existing flocculant is placed in a single location, which results in insufficient contact between the flocculant and the oil in the industrial wastewater, leading to a decrease in flocculation effect and a reduction in pollutant removal rate. At the same time, the existing aeration equipment is located in the center of the bottom of the flotation tank, which causes the bubble rising path to be concentrated and the bubble distribution in the pool edge area to be insufficient, affecting the efficiency of oil droplet floating. Summary of the Invention

[0003] The technical problem that this solution addresses is: (1) How to solve the problem that the location for adding flocculant is set in a single way, which results in insufficient contact between the flocculant and oil in industrial wastewater, leading to a decrease in flocculation effect and a reduction in pollutant removal rate; (2) How to solve the problem that the existing aeration equipment is set in the center of the bottom of the flotation tank, which leads to the concentrated upward path of the bubbles and insufficient distribution of bubbles in the pool side area, thus affecting the efficiency of oil droplet flotation.

[0004] The objective of this invention can be achieved through the following technical solution: an industrial wastewater treatment device, including a shell, a storage tank fixedly installed in the middle of the inner wall of the shell, a liquid outlet pipe connected to the bottom of the storage tank, a control valve fixedly installed in the middle of the liquid outlet pipe, and a feeding mechanism for dispensing flocculants provided below the liquid outlet pipe, and a ventilation mechanism for improving the efficiency of floating oil provided on one side of the feeding mechanism. The feeding mechanism includes a positioning frame fixedly connected to the bottom of the housing. Two positioning plates are fixedly installed on the side of the positioning frame away from the ventilation mechanism. The two positioning plates are arranged vertically, and bearings are fixedly embedded on both positioning plates.

[0005] A further technical improvement of the present invention is that: the inner walls of the two bearings are fixedly connected to a feed pipe, a first pulley is fixedly installed in the middle of the feed pipe, and the input end of the feed pipe is fixedly connected to a feed hopper, the position of the feed hopper corresponding to the position of the output end of the liquid outlet pipe.

[0006] A further technical improvement of the present invention is that: a drive motor is fixedly installed inside the outer casing, and a longitudinally arranged rotating shaft is fixedly connected to the output end of the drive motor. The bottom end of the rotating shaft movably passes through the outer casing, and a second pulley is fixedly installed in the middle of the shaft. A belt is provided for transmission between the second pulley and the first pulley.

[0007] A further technical improvement of the present invention is that: stirring paddles are fixedly installed in the lower middle part and bottom of the rotating shaft; when the closed control valve is opened, the flocculant in the storage tank flows into the discharge hopper along the liquid outlet pipe, and then is discharged into the industrial wastewater through the discharge pipe. When the time of opening the control valve reaches the threshold, the drive motor is turned on to drive the rotating shaft to rotate, so that the two stirring paddles stir and mix the industrial wastewater in the flotation tank. At the same time, the second pulley and the belt drive the first pulley to rotate, so that the discharge pipe and the discharge hopper rotate at the same time. At this time, the flocculant accumulated inside the discharge hopper is splashed out from the top of the discharge hopper due to the centrifugal force, and the flocculant is added to the wastewater near the edge of the flotation tank, so that the flocculant can fully contact the oil in the industrial wastewater, avoiding the decrease in flocculation effect and the reduction in pollutant removal rate.

[0008] A further technical improvement of the present invention is that: the ventilation mechanism includes a mounting plate fixedly connected to the bottom of the outer shell, and two mounting sleeves are rotatably arranged on the side of the mounting plate away from the liquid outlet pipe, and an L-shaped tube is fixedly installed on the inner wall of each of the two mounting sleeves.

[0009] A further technical improvement of the present invention is that: a longitudinally arranged electric push rod is fixedly installed on the inner wall of the outer shell, the protruding end of the electric push rod movably penetrates the outer shell, and a lifting plate is fixedly installed thereon, and two pressing rollers are rotatably arranged on the side of the lifting plate facing the mounting plate.

[0010] A further technical improvement of the present invention is that: the two pressing rollers are respectively rolledly connected to the ends of the two L-shaped tubes near their input ends, the output ends of the L-shaped tubes are connected to a horizontally arranged jet pipe, the two output ends of the jet pipes are fixedly equipped with nozzles, and the input ends of the two L-shaped tubes are close to each other.

[0011] A further technical improvement of the present invention is that an aeration device is provided inside the outer shell between the electric push rod and the storage tank. The aeration device is existing technology, and its two output ends are respectively connected to a first hose and a second hose. The output ends of the first hose and the second hose are respectively connected to the input ends of two L-shaped tubes. By turning on the aeration device, a large number of microbubbles are sprayed out from the four nozzles. The microbubbles adhere to the flocs formed by the flocculant, forming a "bubble-floc" composite, which floats to the water surface to form a scum layer, thus achieving oil-water separation. At this time, the extended end of the electric push rod is in its shortest state. By controlling the extended end of the electric push rod to extend to its longest length, the lifting plate drives two pressing rollers to descend. The two pressing rollers respectively roll and press the ends of the two L-shaped tubes near their input ends, so that the output ends of the two L-shaped tubes move away from each other, thereby changing the position of the four nozzles. During this process, the release position of a large number of microbubbles changes, avoiding insufficient bubble distribution in the pool edge area and ensuring the efficiency of oil droplet floating.

[0012] A method for operating an industrial wastewater treatment device, the method specifically includes the following steps: Step 1: Use external hoisting equipment to lift the outer shell to the middle of the flotation tank, so that both agitators are submerged below the surface of the industrial wastewater. At this time, both jet pipes are located at the bottom of the flotation tank. After receiving the information at the signal receiver, the signal receiver transmits the information to the processor for processing and then issues a command to open the control valve. Step 2: Open the closed control valve to allow the flocculant in the storage tank to flow into the discharge hopper through the outlet pipe, and then be discharged into the industrial wastewater through the discharge pipe. When the control valve is open for a certain period of time, turn on the drive motor to rotate the shaft, causing the two agitators to mix the industrial wastewater in the flotation tank. At the same time, the second pulley and the belt drive the first pulley to rotate, causing the discharge pipe and the discharge hopper to rotate simultaneously. At this time, the flocculant accumulated inside the discharge hopper is splashed out from the top of the discharge hopper due to centrifugal force, distributing flocculant to the wastewater near the edge of the flotation tank. This ensures that the flocculant comes into full contact with the oil in the industrial wastewater, preventing a decrease in flocculation effect and pollutant removal rate. Step 3: Re-activate the aeration device, causing a large number of microbubbles to be sprayed from the four nozzles. The microbubbles adhere to the flocs formed by the flocculant, forming a "bubble-floc" composite. Since its density is less than that of water, it floats to the water surface and forms a scum layer, achieving oil-water separation. At this time, the extended end of the electric push rod is in its shortest state. Control the extended end of the electric push rod to extend to its longest length, and drive the two pressing rollers to descend through the lifting plate. The two pressing rollers roll and press the ends of the two L-shaped tubes near their input ends, causing the output ends of the two L-shaped tubes to move away from each other, thereby changing the position of the four nozzles. During this process, the release position of a large number of microbubbles changes, avoiding insufficient bubble distribution in the pool edge area and ensuring the efficiency of oil droplet floating.

[0013] Compared with the prior art, the beneficial effects of the present invention are: In use, the invention opens the closed control valve, allowing the flocculant in the storage tank to flow into the discharge hopper through the outlet pipe, and then into the industrial wastewater through the discharge pipe. When the control valve is open for a certain period of time, the drive motor is activated, causing the rotating shaft to rotate. This causes the two agitators to mix the industrial wastewater in the flotation tank. Simultaneously, the second pulley, in conjunction with the belt, drives the first pulley to rotate, causing the discharge pipe and discharge hopper to rotate at the same time. At this time, the flocculant accumulated inside the discharge hopper is splashed out from the top of the discharge hopper due to centrifugal force, distributing flocculant to the wastewater near the edge of the flotation tank. This ensures that the flocculant comes into full contact with the oil in the industrial wastewater, preventing a decrease in flocculation effect and pollutant removal rate.

[0014] In use, this invention activates the aeration device, causing a large number of microbubbles to be ejected from four nozzles. These microbubbles adhere to the flocs formed by the flocculant, creating a "bubble-floc" composite that floats to the water surface, forming a scum layer and achieving oil-water separation. At this point, the extended end of the electric push rod is at its shortest position. By controlling the extended end of the electric push rod to its maximum length, the lifting plate drives two pressing rollers to descend. The two pressing rollers roll and press the ends of the two L-shaped tubes near their input ends, causing the output ends of the two L-shaped tubes to move away from each other. This changes the position of the four nozzles. During this process, the release position of a large number of microbubbles changes, preventing insufficient bubble distribution in the pool edge area and ensuring the efficiency of oil droplet buoyancy. Attached Figure Description

[0015] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 3This is a three-dimensional schematic diagram of the internal structure of the outer shell of the present invention; Figure 4 This is a three-dimensional schematic diagram of the feeding mechanism structure of the present invention; Figure 5 This is a three-dimensional schematic diagram of the ventilation mechanism structure of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of the structure at point A in the middle.

[0017] In the diagram: 1. Signal receiver; 2. Ventilation mechanism; 3. Feeding mechanism; 4. Processor; 5. Housing; 6. Aeration fixture; 7. Drive motor; 8. Storage tank; 9. Electric push rod; 10. First hose; 11. Second hose; 12. Liquid outlet pipe; 13. Control valve; 201. L-shaped pipe; 202. Jet pipe; 203. Nozzle; 204. Mounting sleeve; 205. Pressing roller; 206. Mounting plate; 207. Lifting plate; 301. Feed hopper; 302. Bearing; 303. First pulley; 304. Positioning plate; 305. Positioning frame; 306. Feeding pipe; 307. Agitator; 308. Belt; 309. Second pulley; 310. Rotating shaft. Detailed Implementation

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-6 As shown, an industrial wastewater treatment device includes a housing 5. A storage tank 8 is fixedly installed in the middle of the inner wall of the housing 5. The bottom of the storage tank 8 is connected to an outlet pipe 12. A control valve 13 is fixedly installed in the middle of the outlet pipe 12. A feeding mechanism 3 for dispensing flocculant is provided below the outlet pipe 12. A ventilation mechanism 2 for improving the floating oil efficiency is provided on one side of the feeding mechanism 3.

[0020] Please see Figure 3 and Figure 4 As shown, the above-mentioned feeding mechanism 3 includes a positioning frame 305 fixedly connected to the bottom of the outer shell 5. Two positioning plates 304 are fixedly installed on the side of the positioning frame 305 away from the ventilation mechanism 2. The two positioning plates 304 are arranged vertically, and a bearing 302 is fixedly embedded on each of the two positioning plates 304.

[0021] Please see Figure 4As shown, the inner walls of the two bearings 302 are fixedly connected to a feed pipe 306. A first pulley 303 is fixedly installed in the middle of the feed pipe 306, and the input end of the feed pipe 306 is fixedly connected to a feed hopper 301. The position of the feed hopper 301 corresponds to the position of the output end of the liquid outlet pipe 12.

[0022] Please see Figure 2 and Figure 4 As shown, a drive motor 7 is fixedly installed inside the outer casing 5. The output end of the drive motor 7 is fixedly connected to a longitudinally arranged rotating shaft 310. The bottom end of the rotating shaft 310 movably passes through the outer casing 5, and a second pulley 309 is fixedly installed in the middle. A belt 308 is provided between the second pulley 309 and the first pulley 303 for transmission.

[0023] Please see Figure 4 As shown, stirring paddles 307 are fixedly installed on the lower middle and bottom parts of the aforementioned rotating shaft 310. When the closed control valve 13 is opened, the flocculant in the storage tank 8 flows into the discharge hopper 301 along the liquid outlet pipe 12, and then is discharged into the industrial wastewater through the discharge pipe 306. When the time of opening the control valve 13 reaches the threshold, the drive motor 7 is turned on to drive the rotating shaft 310 to rotate, so that the two stirring paddles 307 can stir and mix the industrial wastewater in the flotation tank. At the same time, the second pulley 309, in conjunction with the belt 308, drives the first pulley 303 to rotate, so that the discharge pipe 306 and the discharge hopper 301 rotate simultaneously. At this time, the flocculant accumulated inside the discharge hopper 301 is splashed out from the top of the discharge hopper 301 due to the centrifugal force, and the flocculant is added to the wastewater near the edge of the flotation tank, so that the flocculant can fully contact the oil in the industrial wastewater, avoiding the decrease in flocculation effect and pollutant removal rate.

[0024] Please see Figure 2 and Figure 5 As shown, the above-mentioned ventilation mechanism 2 includes a mounting plate 206 fixedly connected to the bottom of the outer shell 5. Two mounting sleeves 204 are rotatably arranged on the side of the mounting plate 206 away from the liquid outlet pipe 12. An L-shaped pipe 201 is fixedly installed on the inner wall of each of the two mounting sleeves 204.

[0025] Please see Figure 5 and Figure 6 As shown, the inner wall of the outer casing 5 is also fixedly installed with a longitudinally arranged electric push rod 9. The extended end of the electric push rod 9 moves through the outer casing 5 and is fixedly installed with a lifting plate 207. The lifting plate 207 is rotatably arranged with two pressing rollers 205 facing the side of the mounting plate 206.

[0026] Please see Figure 5 and Figure 6As shown, the two pressing rollers 205 are respectively connected to the ends of the two L-shaped tubes 201 near their input ends. The output ends of the L-shaped tubes 201 are connected to the horizontally arranged jet pipes 202. The two output ends of the jet pipes 202 are fixedly equipped with nozzles 203. The input ends of the two L-shaped tubes 201 are close to each other.

[0027] Please see Figure 3 and Figure 5 As shown, an aeration device 6 is installed inside the outer casing 5 between the electric push rod 9 and the storage tank 8. The aeration device 6 is existing technology, and its two output ends are respectively connected to a first hose 10 and a second hose 11. The output ends of the first hose 10 and the second hose 11 are respectively connected to the input ends of two L-shaped pipes 201. By turning on the aeration device 6, a large number of microbubbles are sprayed from the four nozzles 203. The microbubbles adhere to the flocs formed by the flocculant, forming a "bubble-floc" composite, which then floats to the water surface to form a scum layer. At this point, the extended end of the electric push rod 9 is at its shortest position. The extended end of the electric push rod 9 is then extended to its maximum length, which drives the two pressing rollers 205 to descend via the lifting plate 207. The two pressing rollers 205 roll and press the ends of the two L-shaped tubes 201 near their input ends, causing the output ends of the two L-shaped tubes 201 to move away from each other. This changes the position of the four nozzles 203. During this process, the position of a large number of microbubbles released changes, avoiding insufficient bubble distribution in the pool edge area and ensuring the efficiency of oil droplet floating.

[0028] Please see Figure 1 As shown, the processor 4 is fixedly installed on the front of the casing 5, and a signal receiver 1 is also fixedly installed on the front of the casing 5 on one side of the processor 4. Both the signal receiver 1 and the processor 4 are existing technologies.

[0029] A method for operating an industrial wastewater treatment device, the method specifically includes the following steps: Step 1: The outer casing 5 is hoisted to the middle of the flotation tank using external hoisting equipment, so that both agitators 307 are submerged below the surface of the industrial wastewater. At this time, both jet pipes 202 are located at the bottom of the flotation tank. After receiving the information at the signal receiver 1 through manual operation of the external control panel, the information is transmitted to the processor 4 for processing, and then the command to open the control valve 13 is issued. Step 2: Open the closed control valve 13, allowing the flocculant in the storage tank 8 to flow into the discharge hopper 301 along the outlet pipe 12, and then be discharged into the industrial wastewater through the discharge pipe 306. When the time for opening the control valve 13 reaches the threshold, the drive motor 7 is turned on, driving the rotating shaft 310 to rotate, so that the two stirring paddles 307 can stir and mix the industrial wastewater in the flotation tank. At the same time, the second pulley 309, in conjunction with the belt 308, drives the first pulley 303 to rotate, so that the discharge pipe 306 and the discharge hopper 301 rotate simultaneously. Since the flocculant is usually highly viscous, there is an accumulation of flocculant inside the discharge hopper 301. When the discharge hopper 301 rotates, the flocculant accumulated inside it will be splashed out from the top of the discharge hopper 301 due to the centrifugal force, which makes it easier to add flocculant to the wastewater near the edge of the flotation tank, so that the flocculant can fully contact the oil in the industrial wastewater, avoiding a decrease in flocculation effect and pollutant removal rate. Step 3: Turn on the aeration device 6 again, so that a large number of microbubbles are sprayed out from the four nozzles 203. The microbubbles attach to the flocs formed by the flocculant, forming a "bubble-floc" composite. Its density is less than that of water, so it floats to the water surface to form a scum layer, realizing oil-water separation. At this time, the extended end of the electric push rod 9 is in the shortest state. Control the extended end of the electric push rod 9 to extend to its longest length, and drive the two pressing rollers 205 to descend through the lifting plate 207. The two pressing rollers 205 respectively roll and press the ends of the two L-shaped tubes 201 near their input ends, so that the output ends of the two L-shaped tubes 201 are far apart, thereby changing the position of the four nozzles 203. During this process, the position of a large number of microbubbles released changes, avoiding insufficient bubble distribution in the pool edge area and ensuring the efficiency of oil droplet floating.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An industrial wastewater treatment device, comprising a housing (5), wherein a storage tank (8) is fixedly installed in the middle of the inner wall of the housing (5), characterized in that: The bottom of the storage tank (8) is connected to the liquid outlet pipe (12), and a control valve (13) is fixedly installed in the middle of the liquid outlet pipe (12). A feeding mechanism (3) for dispensing flocculant is provided below the liquid outlet pipe (12), and a ventilation mechanism (2) for improving the floating oil efficiency is provided on one side of the feeding mechanism (3). The feeding mechanism (3) includes a positioning frame (305) fixedly connected to the bottom of the outer shell (5). Two positioning plates (304) are fixedly installed on the side of the positioning frame (305) away from the ventilation mechanism (2). Bearings (302) are fixedly embedded on both positioning plates (304).

2. The industrial wastewater treatment equipment according to claim 1, characterized in that, The inner walls of the two bearings (302) are fixedly connected to a feed pipe (306). A first pulley (303) is fixedly installed in the middle of the feed pipe (306), and the input end of the feed pipe (306) is fixedly connected to a feed hopper (301). The position of the feed hopper (301) corresponds to the position of the output end of the liquid outlet pipe (12).

3. The industrial wastewater treatment equipment according to claim 2, characterized in that, A drive motor (7) is fixedly installed inside the outer casing (5). A rotating shaft (310) is fixedly connected to the output end of the drive motor (7). The bottom end of the rotating shaft (310) movably passes through the outer casing (5), and a second pulley (309) is fixedly installed in the middle. A belt (308) is provided between the second pulley (309) and the first pulley (303) for transmission.

4. The industrial wastewater treatment equipment according to claim 3, characterized in that, A stirring paddle (307) is fixedly installed on the lower middle part and bottom of the rotating shaft (310).

5. The industrial wastewater treatment equipment according to claim 1, characterized in that, The ventilation mechanism (2) includes a mounting plate (206) fixedly connected to the bottom of the outer shell (5). Two mounting sleeves (204) are rotatably provided on the side of the mounting plate (206) away from the liquid outlet pipe (12). An L-shaped tube (201) is fixedly installed on the inner wall of each of the two mounting sleeves (204).

6. The industrial wastewater treatment equipment according to claim 5, characterized in that, An electric push rod (9) is also fixedly installed on the inner wall of the outer shell (5). The extended end of the electric push rod (9) extends through the outer shell (5) and is fixedly installed with a lifting plate (207). The lifting plate (207) is rotatably provided with two pressing rollers (205) facing the side of the mounting plate (206).

7. The industrial wastewater treatment equipment according to claim 6, characterized in that, The two pressing rollers (205) are respectively rolledly connected to the ends of the two L-shaped tubes (201) near their input ends. The output ends of the L-shaped tubes (201) are connected to the jet pipes (202). The two output ends of the jet pipes (202) are fixedly equipped with nozzles (203). The input ends of the two L-shaped tubes (201) are close to each other.

8. The industrial wastewater treatment equipment according to claim 7, characterized in that, An aeration device (6) is provided inside the outer shell (5) between the electric push rod (9) and the storage box (8). The two output ends of the aeration device (6) are respectively connected to the first hose (10) and the second hose (11). The output ends of the first hose (10) and the second hose (11) are respectively connected to the input ends of two L-shaped pipes (201).

9. The operating method of an industrial wastewater treatment device according to any one of claims 1-8, characterized in that, This working method specifically includes the following steps: Step 1: The outer shell (5) is hoisted to the middle of the flotation tank by external hoisting equipment, so that both agitators (307) are submerged below the surface of the industrial wastewater. At this time, the two jet pipes (202) are located at the bottom of the flotation tank. After receiving the information at the signal receiver (1) through manual operation of the external control panel, the information is transmitted to the processor (4) for processing and then the instruction to open the control valve (13) is issued. Step 2: Open the closed control valve (13) so that the flocculant in the storage tank (8) flows into the discharge hopper (301) along the liquid outlet pipe (12) and is then discharged into the industrial wastewater through the discharge pipe (306). When the time of opening the control valve (13) reaches the threshold, the drive motor (7) is turned on to drive the rotating shaft (310) to rotate, so that the two stirring paddles (307) stir and mix the industrial wastewater in the flotation tank. At the same time, the second pulley (309) and the belt (308) drive the first pulley (303) to rotate, so that the discharge pipe (306) and the discharge hopper (301) rotate at the same time. At this time, the flocculant accumulated inside the discharge hopper (301) is splashed out from the top of the discharge hopper (301) due to the centrifugal force, and the flocculant is added to the wastewater near the edge of the flotation tank so that the flocculant comes into full contact with the oil in the industrial wastewater. Step 3: Turn on the aeration device (6) again, so that a large number of microbubbles are sprayed out from the four nozzles (203). The microbubbles adhere to the flocs formed by the flocculant, forming a "bubble-floc" composite, which floats to the water surface to form a scum layer, thus achieving oil-water separation. At this time, the extended end of the electric push rod (9) is in the shortest state. Control the extended end of the electric push rod (9) to extend to the longest length, and drive the two pressing rollers (205) to descend through the lifting plate (207). The two pressing rollers (205) respectively roll and press the ends of the two L-shaped tubes (201) near their input ends, so that the output ends of the two L-shaped tubes (201) are far away from each other, thereby achieving the effect of changing the position of the four nozzles (203).

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