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Efficient shallow air flotation machine
Efficient shallow air flotation machine
Product details
1、 Application scope
Shallow air flotationWidely used in water supply and drainage treatment engineering. Firstly, it is applied to the water treatment of water plants that use lake water as their water source to remove algae and reduce turbidity. Secondly, it is applied to industrial wastewater treatment projects, such as petrochemicals, textiles, printing and dyeing, electroplating, metallurgy, food industry, and other fields. Thirdly, it is applied to the recovery of useful substances in wastewater, such as fiber recovery in papermaking and pulp water.
The high-efficiency shallow air flotation device is an intake flotation system that has been successfully designed using the "shallow pool theory" and "zero velocity" principles. It integrates coagulation, air flotation, skimming, sedimentation, and sludge scraping, and is an efficient and energy-saving water purification equipment. Widely used in industrial wastewater treatment systems (such as papermaking, food, electroplating, leather making, knitting, printing and dyeing, wool spinning, slaughtering, petroleum, chemical industry, etc.), especially suitable for fiber recycling in the papermaking industry; It can also be used for water supply, pre-treatment of raw water (such as bath removal, turbidity reduction); It can also be used for the concentration treatment of biological sludge.
two、Main features:
>Compact appearance and small footprint
>Reasonable design, low power consumption
>High gas dissolution efficiency
>The processing effect is stable, and the electromechanical instrument has achieved integrated control
>Easy to operate and simple to maintain
3、 Working principle
The structure of the shallow air flotation device is shown in Figure 1.
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Raw water is pumped through a pump1Enter the air flotation device2The central management3, through a rotatable hydraulic joint4And rotatable distribution tube5Uniformly distributed at the bottom of the air flotation tank, the dissolved air water passes through the central pipe7Enter the rotatable distribution tube8It enters the bottom of the air flotation tank synchronously with the raw water.9It is also a rotatable hydraulic joint. The dissolved water filled with microbubbles collides and adheres fully with the raw water at the bottom of the air flotation device, causing the particles in the raw water to form a specific gravity<1The floating debris rises to the surface and is removed. Distribution pipe for raw water5Distribution pipe for dissolved air and water8Fixed in the same rotating device10Above, its rotation direction is opposite to the water flow direction of the raw water entering the bottom of the air flotation tank, but at the same speed. The key part of this device is the successful use of the "zero velocity" principle, which ensures that the incoming water does not disturb the raw water and solid-liquid separation is carried out in a static state.The floating slag layer formed on the surface is formed by a spiral skimming device11Collect and then pass through the slag discharge pipe12Arrange it outside the pool. The clarified water is collected through a rotating water collection pipe13Collect the rear row to the outside of the pool, collect the water pipe13Related to the central rotating part14Connected together, the residence time of raw water in the air flotation tank is equal to the rotation period of the central rotating part.
The scraper connected to the rotating walking device scrapes the sediment on the bottom and walls of the pool to the mud hopper6Regular emissions.
Another important improvement is fixing it on the rotating walking frame10A set of concentric conical plate devices with a certain distance between each other15Rotate synchronously with the water distribution section along the air flotation tank. Two adjacent conical plates form an inclined circular air floating area16The water in this area is always in a laminar state, which accelerates the upward velocity of particle impurities with microbubbles.
The shallow air flotation device also includes a pair of parallel operating dissolved gas tubes20(abbreviationADT’S)Inlet pump17The pressure is low, just need to202.6 kPaThe water first enters through two channelsADT’SConnected three-way valve18，ADT’SInstall a dissolved air outlet at the other end. Compressed air also passes through a three-way valve19Enter at the same end as the pressure waterADT’SThe pressure of compressed air is generally707.8 kPaAll three-way valves are linked by a regulator, and during normal operation, oneADTThe inlet and outlet are both opened to release dissolved water, while the inlet is closed; At the same time, another oneADTThe water inlet and outlet are closed, and compressed air passes through20～40 μmThe microporous stainless steel plate entersADTDissolve air in water through the pressure of compressed air, rather than relying on the pressure of water. Water enters at high speed along the tangent directionADTMedium, the flow rate can reach10 m/sPressure water is presentADTAdvancing in a spiral shape, reaching995 r/minThe inlet can be adjusted to control the flow rate and velocity.
4、 Comparison between Shallow Air Floatation and Traditional Air Floatation Devices
① In traditional air flotation devices, the pool depth is generally2.0～2.5 mThis is because the equipment is stationary while the water is in motion. When water enters the contact zone from the reaction chamber, it undergoes a change in flow direction and a redistribution of flow velocity, which transforms the water flow into a uniform upward flow. This requires a certain amount of time and height to complete this change, and the height is generally not less than1.5 mDue to the application of the "zero velocity" principle, shallow air flotation enables the equipment to be in motion and the water to be stationary, eliminating the impact of water disturbance on the separation of suspended particles from water and reducing the requirement for height; In addition, in traditional air flotation devices, it is inevitable for mud, sand or flocs to settle at the bottom of the tank. To prevent the mud and sand from being carried out of the tank bottom, the outlet pipe is generally suspended high300 mmIn shallow air flotation devices, there is no need to install a suspended section due to the installation of a mud scraping device at the bottom of the pool. Based on the above analysis, the effective water depth of shallow air flotation devices is generally400～500 mm.
② In traditional air flotation devices, the residence time of water is generally controlled within10～20 minIn shallow air flotation devices, the residence time only needs to be4～6 min.
③ In traditional air flotation devices, the dissolved gas system is equipped with a dissolved gas tank. If calculated based on the actual volume of the dissolved gas tank, its hydraulic retention time is2～4 minIn shallow air flotation devices, the dissolved gas system uses a dissolved gas tube, eliminating the need for fillers, resulting in a volumetric utilization rate of the dissolved gas tube100%Its hydraulic retention time is only10～15 s.
④ In traditional air flotation devices, the scraper regularly removes the floating slag layer, which cannot be selectively cleaned according to the floating time of the floating slag. Therefore, it not only causes significant disturbance to the water body, but also has a high moisture content in the floating slag; In shallow air flotation devices, the spiral skimmer is installed at the front of the water distribution system, and the cleaned floating slag always has the longest floating time in the air flotation tank(4～6 min)The floating slag, which is the most thorough solid-liquid separation and has the lowest moisture content.
5、 Specifications and main technical parameters
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Model specifications |
CQF -10 |
CQF -20 |
CQF -50 |
CQF -80 |
CQF -100 |
CQF -120 |
CQF -200 |
CQF -250 |
CQF -300 |
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Water treatment capacity(m3/h） |
10 |
20 |
50 |
80 |
100 |
120 |
200 |
250 |
300 |
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External dimensions Q×?（mm） |
1800× 1200 |
2200× 1200 |
3400× 1440 |
4300× 1440 |
4800× 1440 |
5400× 1520 |
6800× 1520 |
7600× 1600 |
8400× 1600 |
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What is the diameter of the air flotation tank? （mm） |
1800 |
2200 |
3400 |
4300 |
4800 |
6000 |
6500 |
7600 |
8400 |
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Effective water depth（mm） |
400 |
450 |
500 |
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Stay time（min） |
4~6 |
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Drive mode |
Central transmission |
Peripheral transmission |
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Drive power（KW） |
0.55 |
0.75 |
1.1 |
1.5 |
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Inlet pipe diameter（mm） |
32 |
65 |
65 |
80 |
80 |
80 |
125 |
150 |
150 |
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Diameter of outlet pipe（mm） |
65 |
80 |
125 |
150 |
150 |
200 |
300 |
300 |
350 |
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Diameter of drainage pipe（mm） |
80 |
80 |
125 |
125 |
150 |
150 |
200 |
250 |
250 |
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Operating weight（KG） |
3200 |
4200 |
8800 |
15200 |
20000 |
22800 |
45000 |
49800 |
58400 |
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