CN113636617B - Method and device for quickly removing algae in water by weak cyclone coupling micro-air flotation - Google Patents
Method and device for quickly removing algae in water by weak cyclone coupling micro-air flotation Download PDFInfo
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Abstract
The invention discloses a rotational flow air flotation device, which comprises a cylindrical chassis at the bottom and a main body shell arranged above the cylindrical chassis, wherein the bottom of the main body shell is an inlet section, and a circular truncated cone chassis, a spiral section, a reducing section, an outlet section and a boiling stopping tray are sequentially arranged in the main body shell from the inlet section to the upper part; the side wall of the cylindrical chassis is provided with a gas-dissolved water inlet and an algae-containing water inlet respectively, and the inside of the cylindrical chassis is also provided with a bubble generating device which is connected with the gas-dissolved water inlet; the side wall of the inlet section is provided with a production water outlet, and the top of the main body shell is provided with an algae enrichment outlet. The invention also discloses a water body rapid pre-algae removal device of the weak cyclone coupling micro-air flotation and a corresponding water body rapid pre-algae removal method. The invention can remove algae by coupling weak rotational flow and air flotation, has strong removal efficiency, does not need to add chemical agents, has no secondary pollution, and can realize high-speed pretreatment of algae.
Description
Technical Field
The invention belongs to the technical field of environment-friendly water treatment, and particularly relates to a method and a device for quickly removing algae in a water body by weak rotational flow coupling micro-air flotation.
Background
With the rapid development of industry and agriculture, a large amount of pollutants are discharged into water bodies, so that the eutrophication of the water bodies is caused. Eutrophication of water bodies can lead to excessive growth of algae, of which cyanobacterial bloom is one of the most common and most harmful. During the growth of blue algae, nitrogen and phosphorus in water are utilized to synthesize organic matter, after algae cells are damaged, part of organic matter, such as algal toxin and odor matter, can adversely affect water quality safety, and algae can generate a large amount of OH in photosynthesis - Causing the pH of the water to rise.
The existing method for removing the blue algae mainly comprises air floatation algae removal. The separation efficiency of air flotation algae removal is highly dependent on the collision and adhesion efficiency between algae cells and air bubbles. Because the air bubbles and the algae cells are both provided with negative charges, the collision and adhesion of the air bubbles and the algae cells are not facilitated, and the efficiency of air floatation algae removal is inhibited. Some studies propose to promote bubble adhesion by surfactants, but the efficiency is still low; although the effective removal of algae cells can be realized through the bridging action of the polymer, the secondary pollution of the water body can be caused. In addition, with the shortage of industrial land, the defect of large occupied area of the air floatation can be reflected.
CN201310299604.6 discloses a micro-air-flotation algae removing device and method for small water bodies, which take into consideration the development potential of applying air flotation technology to remove algae in a large range, but are limited by the traditional air flotation process equipment, and the diameter of generated bubbles is large (about 80-100 um), so that the algae removing effect is extremely poor without adding coagulant.
CN200810146851.1 discloses a swimming type algae removal facility and an ultrasonic algae removal device, wherein the ultrasonic algae removal device adopts ultrasonic vibrator integration, but the frequency of the ultrasonic wave can be rapidly reduced in the process of propagation, and the application scene is limited; and the initial investment of ultrasonic algae removal is large, and the development demand of an automatic technology is high, so that the ultrasonic algae removal is difficult to popularize.
CN201621145618.8 discloses an electrochemical device for removing algae by advanced oxidation, which utilizes electrode oxidation reaction to generate hydroxyl radical with strong oxidizing property to perform oxidation reaction with algae, so as to oxidize organic substances including algae cells and extracellular substances into low-toxic or non-toxic small molecule substances. However, the concentration of hydroxyl free radicals prepared by the reaction is low, the reaction time is long, and the effect is not obvious.
Therefore, there is an urgent need in the art to develop a method capable of achieving rapid algae removal in large quantities.
Disclosure of Invention
In view of the defects and shortcomings of the algae removal method and the algae removal device used in the prior art, the invention provides a method and a device for quickly pre-removing algae in a water body by weak rotational flow coupling micro-air flotation so as to realize high-efficiency pretreatment of algae.
In order to achieve the above object, in a first aspect of the present invention, a rotational flow air flotation device is provided, which includes a cylindrical chassis at the bottom, and a main body housing disposed above the cylindrical chassis, where the bottom of the main body housing is an inlet section, and a circular truncated cone chassis, a spiral section, a reducing section, an outlet section, and a boiling-stopping tray are sequentially disposed in the main body housing from the inlet section upwards; the side wall of the cylindrical chassis is provided with a gas-dissolved water inlet and an algae-containing water inlet respectively, and the inside of the cylindrical chassis is also provided with a bubble generating device which is connected with the gas-dissolved water inlet; in addition, a produced water outlet is arranged on the side wall of the inlet section, and an algae enrichment outlet is arranged at the top of the main body shell.
According to the preferred embodiment of the invention, the bubble generating device is an aeration disc, micropores are uniformly distributed on the aeration disc, and the bubble generating device is used for generating micro-nano bubbles and has the function of stabilizing the flow and distributing water.
According to the invention, the circular truncated cone base plate is positioned in the inlet section at the bottom of the main body shell, and the diameter of the bottom of the circular truncated cone base plate is the same as that of the cylindrical base plate and is communicated with the cylindrical base plate.
According to the invention, the diameter of the spiral section is the same as that of the top opening of the circular truncated cone chassis and is communicated with the top opening of the circular truncated cone chassis, and the bottom of the spiral section is also provided with a rotation-making module which is positioned on the top opening of the circular truncated cone chassis so as to rapidly degas and remove algae and air bubbles in incoming water by utilizing centrifugal force generated by liquid rotation.
Furthermore, the spiral section is cylindrical, the diameter of the spiral section is the same as that of the bottom of the diameter reducing section, the height of the spiral section is 8-10 times of that of the outlet section, and a supporting structure is arranged at the bottom of the spiral section and used for installing the rotating making module.
Further, the rotation-making module is a tangential inlet inclined upwards by 45 degrees, or is in the form of a guide spiral blade with a spiral angle of 15-20 degrees. Preferably, the parameters of the backflow helical blade are set as follows: the length is 15-25 mm, the number of the blades is 3-5, and the thickness of the blades is 2-3 mm.
According to the invention, the boiling-stopping tray is fixed above the outlet section and is in a horn shape or a pillar shape with a wide upper part and a narrow lower part, so that the movement height of the production water flowing out of the outlet section is limited, and the production water is radially and uniformly distributed in the inner cavity of the main body shell after flowing out of the outlet section.
Further, the distance between the boiling-stopping tray and the outlet section is preferably 5-10 mm.
According to the invention, the diameter d of the outlet section is 150mm to 200mm, and the height L is 1000mm to 1500mm.
According to the invention, the diameter of the top of the reducing section is the same as that of the outlet section, the reducing angle is 5-10 degrees, and the height is 3-4 times of that of the outlet section.
According to the invention, the angle of the circular table section of the circular table chassis is 30-50 degrees, and the height of the circular table section is 1-2 times of the height of the outlet section.
According to the invention, the aeration disc is fixed at the position right below the spiral section, and the diameter of the aeration disc is 1/2-7/8 of the diameter of the spiral section. Preferably, the distance between the air bubble generating device 13 and the spiral module 22 arranged at the bottom of the spiral section 23 is 100-200 mm.
In a second aspect of the invention, a water body rapid pre-algae removal device of weak rotational flow coupling micro-air flotation is provided, which comprises the rotational flow air flotation device, an air dissolving pump communicated with an air dissolving water inlet of the rotational flow air flotation device through a pipeline, an air compressor and a clear water tank which respectively convey compressed air to the air dissolving pump, a water pump communicated with an algae-containing water inlet of the rotational flow air flotation device through a pipeline, an algae-containing water tank conveying algae-containing water to the water pump, a clear water tank connected with a production water outlet of the rotational flow air flotation device, and a concentrated algae storage tank connected with an algae enrichment outlet of the rotational flow air flotation device.
The third aspect of the invention provides a water body rapid pre-algae removal method by weak rotational flow coupling micro-air flotation, which uses the water body rapid pre-algae removal device and comprises the following steps:
s1: the air compressor compresses air and then transmits the air to the dissolved air pump in a negative pressure manner, and the dissolved air pump mixes the air with clean water from the clean water tank and transmits the air to the rotational flow air flotation device through the dissolved air water inlet; pressurizing the algae-containing water by a water pump, and conveying the algae-containing water to a rotational flow air flotation device through an algae-containing water inlet;
s2: the bubble generating device below the rotational flow air floating device releases bubbles in the dissolved air water from micropores of the aeration disc, reduces the size of the bubbles and uniformly diffuses the bubbles to be fully mixed with the algae-containing water conveyed by the algae-containing water inlet;
s3: the algae-containing sewage and the dissolved gas water are mixed together and then enter a circular platform chassis in the rotational flow air flotation device, and after the weak rotational flow is generated by a rotation-making module below the spiral section, the algae-containing sewage radially enters the inner cavity of the main body shell from bottom to top after impacting a boiling-stopping tray by an outlet section;
s4: the mixed water treated by the weak rotational flow coupling micro air flotation effect is discharged from the main body shell, wherein the algae rises and is discharged into the concentrated algae storage tank through the algae enrichment outlet at the top of the main body shell, and the treated production water is discharged into the purified water tank from the production water outlet at the lower part of the main body shell.
The invention has the following beneficial effects:
1. the weak rotational flow and air flotation are coupled to remove algae, the removal efficiency is high, no chemical agent is required to be added, no secondary pollution is caused, and the high-speed pretreatment of the algae can be realized.
2. The cyclone device and the air floatation device are integrated, the occupied area is small, the structure is compact, and the space utilization rate is high.
3. The invention can adjust the operation parameters of the microbubble generator and the water pump aiming at water samples with different characteristics, and has strong self-adaptive capability.
Drawings
Fig. 1 is a schematic structural diagram of a rotational flow air flotation device.
FIG. 2 is a flow chart of algae-containing water treatment.
FIG. 3 is a process flow diagram of treatment of algae-containing wastewater by a certain wastewater treatment plant.
Detailed Description
The technical solution of the present invention is clearly and completely described in the following embodiments with reference to the accompanying drawings. It is to be understood that the described embodiments are only a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, fall within the scope of the present invention.
Example 1 rotational flow air flotation device
Fig. 1 is a schematic structural diagram of a cyclone air flotation device according to the present invention. As shown in the figure, the cyclone air flotation device comprises a cylindrical chassis 10 at the bottom and a main body shell 20 arranged above the cylindrical chassis 10, wherein an inlet section 30 is arranged at the bottom of the main body shell 20, and a circular truncated cone chassis 21, a spiral section 23, a reducing section 24, an outlet section 25 and a boiling stopping tray 26 are sequentially arranged in the main body shell 20 from the inlet section 30 to the upper part; the side wall of the cylindrical chassis 10 is respectively provided with a gas-dissolved water inlet 11 and an algae-laden water inlet 12, the inside of the cylindrical chassis 10 is also provided with a bubble generating device 13, and the bubble generating device 13 is connected with the gas-dissolved water inlet 11; in addition, the side wall of the inlet section 30 is provided with a produced water outlet 31, and the top of the main body case 20 is provided with an algae-enriching outlet 27.
Further, the bubble generating device 13 is preferably an aeration disc, a plurality of micropores are uniformly distributed on the aeration disc, the pore diameter of each micropore is preferably 2 mm, micro-nano bubbles with the dimension of 0.1-40 μm can be generated, and the bubble generating device also has a function of stabilizing and distributing water, so that the treated water entering the subsequent spiral section 23 is uniformly distributed in the radial direction.
The circular truncated cone chassis 21 is positioned in the inlet section 30 at the bottom of the main body shell 20, and the diameter of the bottom of the circular truncated cone chassis is the same as that of the cylindrical chassis 10 and is communicated with the same; the diameter of the spiral section 23 is the same as that of the top opening of the circular truncated cone chassis 21, the spiral section 23 is communicated with the top opening of the circular truncated cone chassis 21, the bottom of the spiral section 23 is further provided with a rotation making module 22, and the rotation making module 22 is positioned on the top opening of the circular truncated cone chassis 21 so as to rapidly degas and remove algae and bubbles with the particle size smaller than 1 mu m in incoming water by utilizing the centrifugal force generated by liquid rotation.
Further, the rotation-making module 22 can be a tangential inlet inclined upwards by 45 degrees, or a form of a guide spiral blade with a spiral angle of 15-20 degrees. For the form of the guide spiral blade, the parameters of the backflow spiral blade can be set as follows: the length is 15-25 mm, the number of the blades is 3-5, and the thickness of the blades is 2-3 mm.
The anti-boiling tray 26 is fixed above the outlet section 25, and may be fixed by a bracket, for example, and the shape of the anti-boiling tray 26 is preferably a horn shape or a pillar shape with a wide top and a narrow bottom, so as to limit the moving height of the production water flowing out of the outlet section 25, and to make the production water uniformly distributed in the inner cavity of the main body housing 2 in the radial direction after flowing out of the outlet section 25. Preferably, the distance between the boiling-stop tray 26 and the outlet section 25 is 5 to 10mm.
Furthermore, the diameter d of the outlet section 25 is 150 mm-200 mm, and the height L is 1000 mm-1500 mm.
The diameter of the top of the reducing section 24 is the same as that of the outlet section 25, the reducing angle is 5-10 degrees, and the height is 3-4 times of that of the outlet section 25.
The spiral section 23 is cylindrical, the diameter of the spiral section is the same as that of the bottom of the reducing section 24, the height of the spiral section is 8-10 times of that of the outlet section 25, and a supporting structure, such as a buckling supporting structure, is arranged at the bottom of the spiral section 23 and used for installing the rotation making module 22.
The angle of the circular truncated cone section of the circular truncated cone chassis 21 is 30-50 degrees, and the height of the circular truncated cone section is 1-2 times of the height of the outlet section 25.
The material of the aeration disc is ABS engineering plastic, and the shapes of the aeration disc include, but are not limited to, disc type, spherical crown type and circumferential spray head type. Preferably, the aeration disc may be fixed to a position directly below the spiral section 23 by, for example, a bracket, and the diameter of the aeration disc is 1/2 to 7/8 of the diameter of the spiral section 23. Preferably, the distance between the air bubble generating device 13 and the spiral module 22 arranged at the bottom of the spiral section 23 is 100-200 mm, so that the air bubbles released from the aeration disc can be ensured not to become too large, and can be fully mixed with the algae-containing water.
The cylindrical chassis 10 is connected with the bottom of the circular truncated cone chassis 21, the top opening of the circular truncated cone chassis 21 is connected with the spiral section 23, the spiral section 23 is connected with the reducing section 24, and the reducing section 24 is connected with the outlet section 25 through flanges, so that the connection and the disassembly are convenient.
The working principle of the cyclone air flotation device of the embodiment is as follows:
dissolved air water and algae-containing water respectively enter the cylindrical chassis 10 from an air-dissolved water inlet 11 and an algae-containing water inlet 12 of the cylindrical chassis 10, wherein the dissolved air water enters the bubble generating device 13 through the air-dissolved water inlet 11, a large amount of micro-nano bubbles are released while flowing out from micropores of the aeration disc, so that the dissolved air water is fully mixed with the algae-containing water input from the algae-containing water inlet 12, then the dissolved air water enters the rotation making module 22 of the spiral section 23 from the top of the circular table chassis 21, the rotation making module 22 forms weak rotational flow and then enters the spiral section 23, the dissolved air water is accelerated by the diameter reducing section 24 and then rushes out from the outlet section 25 to impact the boiling stopping tray 26 above, the obtained mixture enters the inner cavity of the main body shell 2 along the radial direction after being blocked by the boiling stopping tray 26, finally the bubbles drive algae to be discharged from an algae enrichment outlet 27 at the top of the main body shell 2, and the production water flows out from a production water outlet 31 of an inlet section 30 at the bottom of the main body shell 2.
Embodiment 2, water body rapid pre-algae removal device of weak cyclone coupling micro-air flotation
Fig. 2 is a schematic view of the fast algae pre-removing device for a water body with a weak cyclone coupling micro-air flotation according to the embodiment. The device comprises a cyclone flotation device 100 of embodiment 1, a dissolved air pump 101 communicated with a dissolved air water inlet of the cyclone flotation device 100 through a pipeline, an air compressor 102 and a clean water tank 103 for respectively delivering compressed air to the dissolved air pump 101, a water pump 104 communicated with an algae-containing water inlet of the cyclone flotation device 100 through a pipeline, an algae-containing water tank 105 for delivering algae-containing water to the water pump 104, a clean water tank 106 connected with a production water outlet of the cyclone flotation device 100, and a concentrated algae storage tank 107 connected with an algae enrichment outlet of the cyclone flotation device 100.
A gas meter 108 is arranged between the air compressor 102 and the dissolved air pump 101, mass flowmeters 108 are arranged between the dissolved air pump 101 and the dissolved air water inlet, and mass flowmeters 108 are arranged between the water pump 104 and the algae-containing water tank 105, so that the gas-liquid ratio of the dissolved air water, the water flow of the dissolved air water and the water flow of the algae-containing water and the relative ratio of the dissolved air water and the water flow can be timely adjusted according to the algae concentration, the particle size, the density, the turbidity and other parameters of the algae-containing water to be treated, and the optimal treatment effect can be obtained.
Preferably, the dissolved gas water inlet amount q Dissolved air water The liquid amount q of the algae-containing water is added Algae-containing water The ratio of the amounts of the components is set to 1/10 to 1/2.
The algae removal process of the water body rapid algae removal device using the weak cyclone coupling micro-air flotation of the embodiment is as follows:
s1: the air compressor 102 compresses air and then transmits the compressed air to the dissolved air pump 101 in a negative pressure mode, and the dissolved air pump 101 mixes the air with clean water from the clean water tank 103 and transmits the mixed air to the cyclone air flotation device 100 through the dissolved air water inlet; the algae-laden water is pressurized by the water pump 104 and then conveyed to the cyclone flotation device 100 through the algae-laden water inlet.
S2: the bubble generating device below the rotational flow air floating device 100 releases bubbles in the dissolved air water from micropores of the aeration disc, reduces the size of the bubbles and uniformly diffuses the bubbles to be fully mixed with the algae-containing water conveyed by the algae-containing water inlet 12;
s3: the algae-containing sewage and the dissolved gas water are mixed together, enter a circular platform chassis inside the rotational flow air flotation device 100, generate weak rotational flow through a rotation forming module below a spiral section, and then radially enter an inner cavity of the main body shell after impacting a boiling-stopping tray from an outlet section from bottom to top;
s4: the mixed water treated by the weak cyclone coupling micro-air flotation effect is discharged from the main body shell, wherein the algae rises and is discharged into the concentrated algae storage tank 107 through the algae enrichment outlet at the top of the main body shell, and the treated production water is discharged into the purified water tank 106 from the production water outlet at the lower part of the main body shell.
Application example 1
The water body rapid pre-algae removal device which utilizes weak cyclone coupling micro-air flotation and is disclosed in embodiment 2 is adopted by a certain tin-free sewage treatment plant to carry out algae separation treatment on a lake Taihu blue algae water sample, and the removal rate of algae is required to reach more than 60 percent:
the characteristic parameters of the algae-containing water to be treated are as follows:
the process flow is shown in fig. 3 and comprises two stages of equipment, wherein the first stage of equipment is the water body rapid pre-algae removal device in embodiment 2, tap water is used as micro-air floatation inlet water, the stannless Taihu lake algae-containing water is introduced into the rotational flow air floatation device 100, the tap water directly passes through the dissolved air pump 101 so as to generate a large amount of dissolved air water, then the dissolved air water is released into the inner cavity of the rotational flow air floatation device 100 to carry out air floatation on the algae-containing water in the inner cavity, a spiral section of the inner cavity comprises a rotation-making module, and rapid pre-algae removal is carried out through rotational flow air floatation coupling; the secondary equipment is self-adaptive cyclone multiphase separation equipment 200, the core part of the equipment is a cyclone module mainly comprising a cyclone core pipe, and the cyclone module is used for rapidly degassing and removing oil from dispersed oil drops by utilizing centrifugal force. The rotational flow core tube comprises 1 main centrifugal tube and 4 uniformly distributed and surrounded auxiliary centrifugal tubes; the bottom of the main centrifugal tube is provided with a rotation-making blade, the side wall of the main centrifugal tube is provided with at least two tangential liquid inlets, and the rotation-making blade can change the flowing state of liquid flowing through the rotation-making blade from axial motion to rotary motion; the top of the main separation pipe is provided with a light-phase diversion cone and an anti-scouring cap; the bottom of the auxiliary separation pipe is provided with a heavy phase separation cone, and the top of the auxiliary separation pipe is provided with a light phase separation cone and an anti-impact cap.
The algae-containing water is primarily separated under the action of weak rotational flow generated by a tangential inlet of the main centrifugal tube and the rotation-making blades, light phases such as algae and bubbles flow out from the top through the drainage cone, and heavy phase water enters the 4 auxiliary centrifugal tubes and is continuously separated in the process of repeating the main centrifugal tube. Through the double treatment of the main centrifugal tube and the auxiliary centrifugal tube, the deep removal of algae and gas can be realized.
Comprises the following steps:
the algae-containing water in the algae-containing water storage tank has chlorophyll of =1500 μ g/L, is conveyed to a water phase inlet of a cylindrical chassis of the rotational flow air flotation device under pressure by a water pump, and a flowmeter is connected between the algae-containing water storage tank and the water pump to measure the algae-containing water flow, wherein the algae-containing water flow is 4m 3 /h。
Clear water is used as air flotation, and the water flow of the dissolved air pump is 24m 3 The working pressure is 0.67MPa, the gas-liquid ratio is 8 percent, and the ratio of the gas dissolving water to the algae-containing water is 7.
After the action of the weak cyclone coupling air flotation of the primary equipment, the water phase enters the secondary equipment, the algae and the bubbles in the water phase are rapidly removed by the centrifugal force generated by the self-adaptive cyclone module, and the treated water phase is discharged from a clean water outlet at the bottom.
The equipment runs for 24h continuously, wherein every 8h, measure the average concentration of chlorophyll in primary equipment delivery port and the secondary equipment water purification mouth respectively, and the measuring result is the one-level export: 450.4, 620.7 and 550.2 mu g/L; secondary outlets 394.5, 556.5, 480 μ g/L;
result analysis shows that on the premise of not adding any flocculating agent, tap water is used as micro-air-flotation inflow water to remove medium-concentration (chlorophyll =1500 +/-100 mug/L) algae-containing water, the highest removal rate of chlorophyll in the algae-containing water reaches 73.7%, the lowest removal rate is 62.9%, the average removal rate is 68.2%, the content of algae after treatment is obviously reduced, the removal rate of the algae reaches more than 60%, and the discharge requirement of production water is met. And the chlorophyll concentration ratio of the primary outlet to the secondary outlet is 87.6%, 89.6% and 87.2% respectively, which shows that the removal of most of algae is completed in the primary equipment, and the secondary equipment mainly plays a role in removing gas in the outlet water of the primary equipment so as to facilitate the treatment of the subsequent process.
The algae removal effect is shown in the following table:
finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A rotational flow air flotation device is characterized by comprising a cylindrical chassis at the bottom and a main body shell arranged above the cylindrical chassis, wherein the bottom of the main body shell is an inlet section, and a round platform chassis, a spiral section, a reducing section, an outlet section and a boiling stopping tray are sequentially arranged in the main body shell from the inlet section to the upper part; the side wall of the cylindrical chassis is respectively provided with a gas-dissolved water inlet and an algae-laden water inlet, and the inside of the cylindrical chassis is also provided with a bubble generating device which is connected with the gas-dissolved water inlet; in addition, a produced water outlet is arranged on the side wall of the inlet section, and an algae enrichment outlet is arranged at the top of the main body shell;
the bubble generating device is an aeration disc, micropores are uniformly distributed on the aeration disc, and the bubble generating device is used for generating micro-nano bubbles and has the function of stabilizing the flow and distributing water;
the diameter of the spiral section is the same as that of the top opening of the circular truncated cone chassis and is communicated with the top opening of the circular truncated cone chassis, and the bottom of the spiral section is also provided with a rotation-making module which is positioned on the top opening of the circular truncated cone chassis so as to rapidly degas and remove algae and air bubbles in incoming water by utilizing centrifugal force generated by liquid rotation;
the rotation-making module is a tangential inlet inclined upwards by 45 degrees, or is in the form of a guide spiral blade with a spiral angle of 15-20 degrees.
2. The cyclonic air flotation device as claimed in claim 1, wherein the circular truncated cone base is located in the inlet section of the bottom of the main body housing, and the diameter of the bottom of the circular truncated cone base is the same as that of the cylindrical base and is communicated with the cylindrical base.
3. The cyclone air flotation device according to claim 1, wherein the spiral section is cylindrical, the diameter of the spiral section is the same as the diameter of the bottom of the reducing section, the height of the spiral section is 8-10 times of the height of the outlet section, and a support structure is arranged at the bottom of the spiral section and used for mounting the cyclone generation module.
4. The cyclonic air flotation device according to claim 1, wherein the parameters of the reverse flow helical blade are set as follows: the length is 15-25 mm, the number of the blades is 3-5, and the thickness of the blades is 2-3 mm.
5. The cyclone air-flotation device according to claim 1, wherein the boiling-stopping tray is fixed above the outlet section and is shaped like a horn or a pillar with a wide top and a narrow bottom, so as to limit the moving height of the production water flowing out of the outlet section, and the production water is radially and uniformly distributed in the inner cavity of the main body shell after flowing out of the outlet section.
6. The cyclonic air flotation device according to claim 5, wherein the distance between the boiling-stopping tray and the outlet section is 5-10 mm.
7. The vortex air-flotation device according to claim 1, wherein the diameter d of the outlet section is 150mm to 200mm, and the height L is 1000mm to 1500mm.
8. The cyclone air-flotation device according to claim 1, wherein the diameter of the top of the reducing section is the same as that of the outlet section, the reducing angle is 5-10 degrees, and the height is 3-4 times of the height of the outlet section.
9. The cyclone air-flotation device as claimed in claim 1, wherein the angle of the circular truncated cone section of the circular truncated cone base plate is 30-50 degrees, and the height is 1-2 times of the height of the outlet section.
10. The cyclone air-flotation device according to claim 1, wherein the aeration disc is fixed at a position right below the spiral section, and the diameter of the aeration disc is 1/2-7/8 of the diameter of the spiral section.
11. The cyclone air-flotation device as claimed in claim 10, wherein the distance between the bubble generation device and the spiral module arranged at the bottom of the spiral section is 100-200 mm
12. A water body rapid pre-algae removal device of weak rotational flow coupling micro-air flotation is characterized by comprising the rotational flow air flotation device of any one of claims 1 to 11, a dissolved air pump communicated with a dissolved air water inlet of the rotational flow air flotation device through a pipeline, an air compressor and a clear water tank which respectively convey compressed air to the dissolved air pump, a water pump communicated with an algae-containing water inlet of the rotational flow air flotation device through a pipeline, an algae-containing water tank conveying algae-containing water to the water pump, a clear water tank connected with a production water outlet of the rotational flow air flotation device, and a concentrated algae storage tank connected with an algae enrichment outlet of the rotational flow air flotation device.
13. A water body rapid algae pre-removing method of weak rotational flow coupling micro-air flotation, which uses the water body rapid algae pre-removing device of claim 12, and is characterized by comprising the following steps:
s1: the air compressor compresses air and then transmits the air to the dissolved air pump in a negative pressure manner, and the dissolved air pump mixes the air with clean water from the clean water tank and transmits the air to the rotational flow air flotation device through the dissolved air water inlet; pressurizing the algae-containing water by a water pump, and conveying the algae-containing water to a rotational flow air flotation device through an algae-containing water inlet;
s2: the bubble generating device below the rotational flow air flotation device releases bubbles in the dissolved air from micropores of the aeration disc, reduces the size of the bubbles, uniformly diffuses the bubbles and fully mixes the bubbles with the algae-containing water conveyed by the algae-containing water inlet;
s3: the algae-containing sewage and the dissolved gas water are mixed together, then enter a circular platform chassis in the rotational flow air flotation device, generate weak rotational flow through a rotation forming module below the spiral section, then impact a boiling-stopping tower tray from the outlet section from bottom to top, and then radially enter an inner cavity of the main body shell;
s4: the mixed water treated by the weak rotational flow coupling micro-air floatation effect is discharged from the main body shell, wherein the algae rises and is discharged into the concentrated algae storage tank through the algae enrichment outlet at the top of the main body shell, and the treated production water is discharged into the purified water tank from the production water outlet at the lower part of the main body shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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