Novel integrated oil-water separation microbubble air flotation machine and oil-water separation method

Abstract

The invention relates to an oil-water separation device and an oil-water separation method, in particular to a novel integrated oil-water separation microbubble air flotation machine and an oil-water separation method, and aims to solve the problems that although the existing air flotation technology has remarkable advantages in treatment of an oil-water mixture, the oil-water separation effect is poor; however, the traditional air flotation equipment still has the defect of certain limitation in treatment efficiency and thoroughness in oil stain removal. According to the novel integrated oil-water separation microbubble air flotation machine, a multiphase flow pump is used for generating a large number of microbubbles, and oil dirt is promoted to float upwards; meanwhile, oil stains on the water surface are adsorbed through the oil stain adsorption material and extruded and recycled through the roller assembly, and the oil stain removal efficiency is effectively improved.

Description

Technical Field

[0001] The invention relates to an oil-water separation device and method, and in particular to a novel integrated oil-water separation micro-bubble flotation machine and an oil-water separation method. Background Art

[0002] With the acceleration of industrialization, the discharge of industrial wastewater has become one of the important sources of environmental pollution. Especially in the petroleum, chemical, food processing and other industries, a large amount of wastewater containing grease and suspended solids will be generated during their production process. The treatment of oil-water mixture has always been a difficult point in industrial wastewater treatment. If it is not effectively treated and discharged, it will cause serious pollution to the water environment and affect the reuse of water resources and ecological balance. Therefore, how to efficiently separate grease and other suspended matter in industrial wastewater has always been an important topic in the field of environmental protection.

[0003] Traditional oil-water separation equipment, such as gravity sedimentation and centrifugal separation, can achieve certain separation effects under certain conditions, but the treatment effect on tiny oil droplets and low-concentration oil pollution is often not ideal. In addition, traditional equipment has low treatment efficiency, large floor space, and high operating costs, which makes it difficult to meet the modern industry's requirements for efficient and environmentally friendly sewage treatment. Therefore, the development of efficient, energy-saving and small-footprint oil-water separation equipment has become an urgent need for technological development.

[0004] In recent years, flotation technology has gradually become one of the mainstream methods for oil-water separation because it can effectively separate oil, suspended solids and colloidal pollutants in wastewater. The flotation machine forms a large number of microbubbles by mixing air and water. The bubbles attach to the oil particles and make them float to the water surface, thus achieving oil-water separation. Although flotation technology has shown significant advantages in treating oil-water mixtures, traditional flotation equipment still has certain limitations in treatment efficiency and thoroughness of oil removal. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that although the existing flotation technology has shown significant advantages in treating oil-water mixtures, traditional flotation equipment still has certain limitations in treatment efficiency and thoroughness of oil pollution removal, and to provide a new integrated oil-water separation microbubble flotation machine and oil-water separation method.

[0006] In order to solve the deficiencies of the above-mentioned prior art, the present invention provides the following technical solutions:

[0007] A novel integrated oil-water separation micro-bubble flotation machine, characterized in that it comprises a main body, a micro-bubble generating component and an oil scraping component;

[0008] A water inlet and an overflow port are respectively arranged on the side walls at both ends of the body, and a first baffle connected to the bottom plate of the body and a second baffle connected to the top plate of the body are sequentially arranged in the body in a direction away from the water inlet, the first baffle divides the body into a reaction zone and a clean water zone, and the height of the top of the first baffle is lower than the height of the water inlet and the overflow port; a water inlet cavity with an opening at the lower end is formed between the second baffle and the inner wall of one end of the body where the water inlet is arranged, the water inlet cavity is located in the reaction zone, and N third baffles are arranged from top to bottom, the multiple third baffles divide the water inlet cavity into an S-shaped channel, and a dosing hole is arranged at the top of the water inlet cavity; N is an integer greater than or equal to 3;

[0009] A water outlet is provided on the side wall of the main body near the bottom surface of the main body;

[0010] The microbubble generating assembly comprises a multiphase flow pump, a pump outlet pipe and a gas release head; the multiphase flow pump is located outside the body, the first input end is used to inhale gas, the output end is connected to the pump outlet pipe and the gas release head in sequence, the pump outlet pipe passes through the body, the output end of the pump outlet pipe is located in the reaction zone and the height is lower than the height of the bottom end of the second partition, the gas release head is used to generate microbubbles, and the microbubbles are used to attach to oil and suspended solids during the floating process;

[0011] The oil scraper assembly includes an oil scraper, an oil adsorbing material, a roller assembly and an oil drain trough; the oil scraper is arranged on the upper part of the main body, the oil adsorbing material is arranged on the chain of the oil scraper and passes through the roller assembly to squeeze the oil adsorbing material; the oil drain trough is arranged on the main body and is located below the roller assembly.

[0012] Further, the nth third partition from top to bottom is arranged on the inner wall of the body, and the n+1th third partition is arranged on the second partition, where n is a positive odd number, n≤N-1;

[0013] Alternatively, the nth third partition from top to bottom is arranged on the inner wall of the main body, and the n-1th third partition is arranged on the second partition, where n is a positive even number, n≤N.

[0014] Furthermore, the second input end of the multiphase flow pump is connected to a return water pipe, and the input end of the return water pipe is located in the clean water area.

[0015] Furthermore, a pressure gauge is provided on the water outlet pipe of the pump, and a plurality of small holes are provided on the surface of the air release head;

[0016] The oil stain adsorbing material is made of polyurethane sponge or polypropylene fiber.

[0017] Furthermore, the height of the overflow port is lower than the oil drain tank and higher than the lowest point of the chain of the oil scraper, and the height of the water inlet and the overflow port are the same.

[0018] Furthermore, at least one vent is provided on the bottom surface of the main body.

[0019] Furthermore, the oil scraper includes a driving shaft and a pair of driving sprockets respectively arranged at both ends thereof, a driven shaft and a pair of driven sprockets respectively arranged at both ends thereof, and a pair of chains respectively arranged between the pair of driving sprockets and the pair of driven sprockets; a pair of driving sprockets are installed on the top plate of the main body, a pair of driven sprockets are installed on two corresponding side plates of the main body, and the height of the lowest point of the pair of chains is lower than the height of the water inlet and the overflow port; the oil adsorption material is located between the pair of chains, and its two sides are respectively arranged on the pair of chains.

[0020] Furthermore, the active rotating shaft of the oil scraper is driven by a motor, and the roller assembly includes two rollers correspondingly arranged along both sides of the oil adsorption material, and both ends of each roller are respectively arranged on two corresponding side plates of the main body, and the surface is provided with concave and convex patterns.

[0021] An oil-water separation method, using the novel integrated oil-water separation microbubble flotation machine, is special in that it includes the following steps:

[0022] Step 1, inputting the oil-water mixture into the water inlet chamber through the water inlet, and before or at the same time as inputting the oil-water mixture, adding the reagent through the dosing hole;

[0023] Step 2: The oil-water mixture is output to the water inlet chamber after passing through the S-shaped channel in the water inlet chamber, and microbubbles are generated through the multiphase flow pump, the pump outlet pipe, and the gas release head. The microbubbles are attached to the oil and suspended solids in the water during the floating process;

[0024] Step 3, when the microbubbles generated in step 2 rise to the water surface, they are adsorbed by oil adsorption materials; then the oil adsorption materials are squeezed by the roller assembly to release the adsorbed oil into the oil drain tank, and the oil is discharged through the oil drain tank for subsequent treatment and recycling;

[0025] Step 4: After all the oil and dirt in the oil-water mixture in step 1 are separated, the separated water is discharged through the water outlet to complete the oil-water separation.

[0026] Furthermore, the step 2 also includes: returning the liquid in the clean water area to the multiphase flow pump through a return water pipe.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The novel integrated oil-water separation microbubble flotation machine of the present invention utilizes a multiphase flow pump to generate a large number of microbubbles to cause the oil to float up; at the same time, the oil on the water surface is adsorbed by the oil adsorption material and the oil is squeezed and recovered by the roller assembly, thereby effectively improving the efficiency of oil removal.

[0029] (2) In the present invention, an S-shaped channel is designed in the water inlet chamber, which can effectively extend the travel of the oil-water mixture, slow down the speed of the oil-water mixture, and ensure that the oil-water mixture stays in the body for a sufficiently long time, thereby improving the effect of flotation separation and oil removal; at the same time, the oil-water mixture passes through multiple turns of the S-shaped channel, which can fully mix the oil-water mixture and the reagent, thereby enhancing the subsequent flotation and separation effects.

[0030] (3) The return water pipe in the present invention further optimizes the overall process, ensures the efficient operation of the equipment, and meets the high standards of modern industry for sewage treatment.

[0031] (4) The oil-water separation method of the present invention firstly mixes the reagent with the oil-water mixture through an S-shaped channel and avoids short-circuiting to ensure sufficient separation. Then, a multiphase flow pump is used to mix the gas, the oil-water mixture and the reagent to generate a large number of microbubbles, which effectively attach the oil stains and make them float, thereby improving the treatment efficiency. Finally, the oil stains on the water surface are dynamically adsorbed by the oil stain adsorption material, and the oil stains are recovered to the oil drain tank by roller extrusion, thereby realizing automatic oil removal and completely removing the oil stains. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a front view of an embodiment of a novel integrated oil-water separation micro-bubble flotation machine of the present invention (the main body front panel is not shown);

[0033] Figure 2 It is a top view of an embodiment of the present invention (the third partition plate and the main body top plate are not shown).

[0034] The following are the descriptions of the reference numerals:

[0035] 1-main body; 2-dosing hole; 3-water inlet; 4-water outlet; 5-vent; 6-third partition; 7-multiphase flow pump; 8-support platform; 9-pump outlet pipe; 10-return water pipe; 11-gas release head; 12-first partition; 13-oil scraper; 14-roller assembly; 15-oil drain tank; 16-oil adsorption material; 17-pressure gauge; 18-motor; 19-overflow port; 20-second partition; 21-water inlet chamber. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings and exemplary embodiments.

[0037] Reference Figures 1-2 A novel integrated oil-water separation microbubble flotation machine comprises a main body 1, a microbubble generating component and an oil scraping component.

[0038] The main body 1 is a hollow hexahedron, and a water inlet 3 and an overflow port 19 are respectively provided on the side walls at both ends (left plate and right plate). The water inlet 3 and the overflow port 19 have the same height. A first partition plate 12 connected to the bottom plate of the main body 1 and a second partition plate 20 connected to the top plate of the main body 1 are sequentially provided in the main body 1 along the direction away from the water inlet 3 and parallel to the side walls at both ends.

[0039] The first partition 12 divides the body 1 into a reaction zone and a clean water zone. The reaction zone is the zone for processing the oil-water mixture, while the clean water zone is used to collect the separated clean water. The partition prevents the water that has not been completely separated from directly entering the clean water zone, ensuring that the oil-water separation process is carried out effectively. The height of the top of the first partition 12 is lower than the height of the water inlet 3 and the overflow port 19, ensuring that the water flow can flow smoothly from the reaction zone to the clean water zone. After the water flow passes through the microbubble separation process in the reaction zone, the water level gradually rises and overflows the top of the partition into the clean water zone, which ensures that the separated water flow will not carry untreated oil pollution.

[0040] A water inlet chamber 21 with an opening at the lower end is formed between the second partition plate 20 and the inner wall of the body 1. The water inlet chamber 21 is located in the reaction zone, and N third partition plates 6 are arranged from top to bottom. The plurality of third partition plates 6 divide the water inlet chamber 21 into an S-shaped channel, and a dosing hole 2 is arranged at the top of the water inlet chamber 21. N is an integer greater than or equal to 3; in this embodiment, N is 6.

[0041] The nth third partition plate 6 from top to bottom is arranged on the inner wall of the body 1, and the n+1th third partition plate 6 is arranged on the second partition plate 20, n is a positive odd number, n≤N-1; the distance between two adjacent third partition plates 6 in the vertical direction is the same. In other embodiments, the nth third partition plate 6 from top to bottom may be arranged on the inner wall of the body 1, and the n-1th third partition plate 6 may be arranged on the second partition plate 20, and n is a positive even number, n≤N.

[0042] A water outlet 4 is provided on the side wall of the body 1 where the overflow port 19 is located, near the bottom surface of the body 1, for discharging the water after oil-water separation; three drain ports 5 are provided on the bottom surface of the body 1, for draining the liquid in the body 1 during equipment maintenance or cleaning.

[0043] The microbubble generating assembly comprises a multiphase flow pump 7, a pump outlet pipe 9, a return water pipe 10 and a gas release head 11; the multiphase flow pump 7 is arranged on the outer surface of the front plate of the main body 1 through a support platform 8, the first input end of the multiphase flow pump 7 is used to inhale gas, the second input end is connected to the return water pipe 10, the input end of the return water pipe 10 is located in the clean water area; it is used to return the liquid in the clean water area to the multiphase flow pump 7, the output end is connected to the pump outlet pipe 9 and the gas release head 11 in sequence, the pump outlet pipe 9 passes through the main body 1, the output end of the pump outlet pipe 9 is located in the reaction area and the height is lower than the height of the bottom end of the second partition 20, the surface of the gas release head 11 is provided with a plurality of small holes for generating microbubbles, these microbubbles are attached to the oil and suspended solids in the water, so that their density is reduced, so that they float to the water surface; a pressure gauge 17 is provided on the pump outlet pipe 9 to ensure the effect of microbubble generation.

[0044] The oil scraper assembly includes an oil scraper 13, an oil adsorbing material 16, a roller assembly 14 and an oil drain trough 15; the oil scraper 13 is arranged on the upper part of the body 1, and the oil scraper 13 includes a driving shaft and a pair of driving sprockets respectively arranged at both ends thereof, a driven shaft and a pair of driven sprockets respectively arranged at both ends thereof, and a pair of chains respectively arranged between the pair of driving sprockets and the pair of driven sprockets; the pair of driving sprockets are installed on the top plate of the body 1, and the pair of driven sprockets are installed on the front plate and the rear plate of the body 1, and the lowest height of the pair of chains is lower than the height of the water inlet 3 and the overflow port 19; the oil adsorbing material 16 Located between a pair of chains, its two sides are respectively arranged on a pair of chains; the roller assembly 14 is arranged on the chain transmission path of the oil scraper 13, and is used to squeeze the oil adsorbing material 16. The roller assembly 14 includes two rollers correspondingly arranged along the two sides of the oil adsorbing material 16, and the two ends of each roller are respectively arranged on the front plate and the rear plate of the body 1, and the surface is provided with concave and convex patterns to enhance the squeezing effect on the oil adsorbing material 16, so as to more effectively release the adsorbed oil; the oil drain groove 15 is arranged on the body 1 and located below the roller assembly 14, and one end of the oil drain groove 15 passes through the body 1 to facilitate the discharge of oil. Specifically, the active shaft of the oil scraper 13 is driven by a motor 18, and the oil adsorbing material 16 is made of polyurethane sponge, and can also be made of polypropylene fiber.

[0045] The height of the overflow port 19 is lower than the height of the oil drain tank 15, ensuring that the overflowing water will not affect the collection of oil pollution; and it is higher than the height of the lowest part of the chain of the oil scraper 13, ensuring that the oil pollution adsorbent material 16 can contact the water surface and effectively absorb the oil pollution when the equipment is operating normally. Precise control of the preset height helps to maintain a stable liquid level in the flotation machine, thereby ensuring the efficiency and stability of the entire oil-water separation process.

[0046] An oil-water separation method, using the novel integrated oil-water separation microbubble flotation machine, comprises the following steps:

[0047] Step 1: Input the oil-water mixture into the water inlet chamber 21 through the water inlet 3, and before or at the same time as the oil-water mixture is input, add the reagent through the dosing hole 2 to improve the separation effect;

[0048] Step 2: The oil-water mixture is discharged from the water inlet chamber 21 after passing through the S-shaped channel in the water inlet chamber 21, and microbubbles are generated through the multiphase flow pump 7, the pump outlet pipe 9, and the gas release head 11. The microbubbles are attached to the oil and suspended solids in the water during the floating process;

[0049] Step 3: The microbubbles in step 2 rise to the water surface and are adsorbed by the oil adsorbing material 16; the oil adsorbing material 16 is then squeezed by the roller assembly 14 to release the adsorbed oil into the oil drain trough 15, where it is discharged for subsequent treatment and recycling;

[0050] At the same time, the liquid in the clean water area is returned to the multiphase flow pump 7 through the return water pipe 10. Through the circulation of the return water, the suspended oil in the water is ensured to be repeatedly processed, thereby improving the effect of oil-water separation;

[0051] Step 4: After all the oil and dirt in the oil-water mixture in step 1 are separated, the separated water is discharged through the water outlet 4 to complete the oil-water separation.

Claims

1. A new type of integrated oil-water separation micro-bubble flotation machine, characterized by: It comprises a body (1), a micro-bubble generating component and an oil scraping component; A water inlet (3) and an overflow port (19) are respectively arranged on the side walls at both ends of the body (1); a first baffle (12) connected to the bottom plate of the body (1) and a second baffle (20) connected to the top plate of the body (1) are sequentially arranged in the body (1) in a direction away from the water inlet (3); the first baffle (12) divides the body into a reaction zone and a clean water zone; the height of the top of the first baffle (12) is lower than the height of the water inlet (3) and the overflow port (19); a water inlet chamber (21) with an opening at the lower end is formed between the second baffle (20) and the inner wall of one end of the body (1) where the water inlet (3) is arranged; the water inlet chamber (21) is located in the reaction zone, and N third baffles (6) are arranged from top to bottom; the plurality of third baffles (6) divide the water inlet chamber (21) into an S-shaped channel; a dosing hole (2) is arranged at the top of the water inlet chamber (21); N is an integer greater than or equal to 3; A water outlet (4) is provided on the side wall of the main body (1) near the bottom surface of the main body (1); The microbubble generating assembly comprises a multiphase flow pump (7), a pump outlet pipe (9) and a gas release head (11); the multiphase flow pump (7) is located outside the body (1), the first input end is used to inhale gas, the output end is connected to the pump outlet pipe (9) and the gas release head (11) in sequence, the pump outlet pipe (9) passes through the body (1), the output end of the pump outlet pipe (9) is located in the reaction zone and the height is lower than the height of the bottom end of the second partition (20), the gas release head (11) is used to generate microbubbles, and the microbubbles are used to attach to oil pollution and suspended solids during the floating process; The oil scraper assembly comprises an oil scraper (13), an oil-absorbing material (16), a roller assembly (14) and an oil drain groove (15); the oil scraper (13) is arranged on the upper part of the main body (1); the oil-absorbing material (16) is arranged on a chain of the oil scraper (13) and passes through the roller assembly (14) to squeeze the oil-absorbing material (16); the oil drain groove (15) is arranged on the main body (1) and is located below the roller assembly (14).

2. A novel integrated oil-water separation microbubble flotation machine according to claim 1, characterized in that: From top to bottom, the nth third partition plate (6) is arranged on the inner wall of the body (1), and the n+1th third partition plate (6) is arranged on the second partition plate (20), where n is a positive odd number, n≤N-1; Alternatively, the nth third partition plate (6) from top to bottom is arranged on the inner wall of the body (1), and the n-1th third partition plate (6) is arranged on the second partition plate (20), where n is a positive even number, n≤N.

3. A novel integrated oil-water separation microbubble flotation machine according to claim 1 or 2, characterized in that: The second input end of the multiphase flow pump (7) is connected to a return water pipe (10), and the input end of the return water pipe (10) is located in the clean water area.

4. The novel integrated oil-water separation microbubble flotation machine according to claim 3 is characterized by: The pump outlet pipe (9) is provided with a pressure gauge (17), and the surface of the air release head (11) is provided with a plurality of small holes; The oil stain adsorbing material (16) is made of polyurethane sponge or polypropylene fiber.

5. The novel integrated oil-water separation microbubble flotation machine according to claim 4 is characterized by: The height of the overflow port (19) is lower than the oil drain groove (15) and higher than the lowest point of the chain of the oil scraper (13), and the height of the water inlet (3) and the overflow port (19) are the same.

6. The novel integrated oil-water separation microbubble flotation machine according to claim 5 is characterized by: The bottom surface of the body (1) is provided with at least one venting port (5).

7. The novel integrated oil-water separation microbubble flotation machine according to claim 1 is characterized by: The oil scraper (13) comprises a driving shaft and a pair of driving sprockets respectively arranged at both ends thereof, a driven shaft and a pair of driven sprockets respectively arranged at both ends thereof, and a pair of chains respectively arranged between the pair of driving sprockets and the pair of driven sprockets; the pair of driving sprockets are mounted on the top plate of the body (1), the pair of driven sprockets are mounted on two corresponding side plates of the body (1), and the height of the lowest part of the pair of chains is lower than the height of the water inlet (3) and the overflow port (19); the oil adsorbent (16) is located between the pair of chains, and its two sides are respectively arranged on the pair of chains.

8. The novel integrated oil-water separation microbubble flotation machine according to claim 7 is characterized by: The active rotating shaft of the oil scraper (13) is driven by a motor (18), and the roller assembly (14) comprises two rollers correspondingly arranged along the two sides of the oil adsorption material (16), and the two ends of each roller are respectively arranged on two corresponding side plates of the body (1), and the surface is provided with concave-convex patterns.

9. An oil-water separation method, using the novel integrated oil-water separation microbubble flotation machine according to claim 1, characterized in that: The steps include: Step 1: Inputting an oil-water mixture into the water inlet chamber (21) through the water inlet (3), and before or at the same time as the oil-water mixture is input, adding a reagent through the dosing hole (2); Step 2, the oil-water mixture is output to the water inlet chamber (21) after passing through the S-shaped channel in the water inlet chamber (21), and microbubbles are generated through the multiphase flow pump (7), the pump outlet pipe (9), and the gas release head (11), and the microbubbles are attached to the oil and suspended solids in the water during the floating process; Step 3, wait for the microbubbles generated in step 2 to rise to the water surface, and then use the oil adsorption material (16) to adsorb them; then use the roller assembly (14) to squeeze the oil adsorption material (16) to release the adsorbed oil into the oil drain tank (15), and discharge it through the oil drain tank (15) for subsequent treatment and recovery; Step 4: After all the oil and dirt in the oil-water mixture in step 1 is separated, the water separated from the oil and water is discharged through the water outlet (4) to complete the oil-water separation.

10. The oil-water separation method according to claim 9, characterized in that: The step 2 further comprises: returning the liquid in the clean water area to the multiphase flow pump (7) via a return water pipe (10).

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