Structure and working principle
The dissolved air flotation equipment is cylindrical in shape, with a compact structure and a shallow pool. It consists of the pool body, spiral water distribution mechanism, dissolved air release mechanism, rotating frame, water collection mechanism, slag spreading mechanism, dissolved air system, return water pipeline, and electric control cabinet. The water inlet, water outlet, and sludge discharge outlet are all within the rotating area of the equipment, and the water distribution mechanism, water collection mechanism, and dissolved air release mechanism are tightly connected to the frame, rotating around the center of the pool. This device provides a complete set of equipment and control systems, combining centralized control with decentralized control to enable the equipment to achieve optimal operating conditions.
Flotation separation technology refers to the process of dissolving gas into water to the maximum extent under a certain working pressure, striving to achieve a saturated state. The pressure-dissolved gas water is then released through decompression, generating a large number of fine bubbles. These bubbles fully contact the suspended flocs in the water, causing the suspended flocs to adhere to the microbubbles and float to the surface. The scum formed is then scraped off, thereby purifying the water quality. The dissolved air flotation equipment is an advanced rapid flotation system. Based on traditional flotation theory, it successfully applies the "shallow layer theory" and the "zero speed principle." Through careful design, it integrates flocculation, flotation, skimming, and mud scraping, making it an efficient piece of equipment for water purification.
The high-efficiency shallow flotation device addresses the shortcomings of traditional flotation tanks. Its raw water inlet and purified water outlet are designed to be mobile, shortening the floating time of bubbles in the raw water. Specifically, when the raw water flows into the flotation tank, the water distribution pipe moves in the opposite direction of the raw water outflow, allowing the incoming water to remain relatively static within the tank. As a result, the bubbles float to the surface along the vertical direction, with a floating speed similar to that of the solids in the raw water (4–10 cm/min). This enables the suspended matter to float quickly to the surface, while the purified water, beneath the scum, remains in place. When the purified water collection pipe moves to this area, the purified water can then be discharged from the pool. To ensure the inlet and outlet move synchronously, the device is designed to be circular, with the inlet and outlet pipes placed on the rotating frame, allowing it to rotate around the center. This mobile water distribution method creates "zero speed." As a result, the suspended matter in the raw water floats to the surface quickly, and the raw water can meet purification requirements in just three minutes.
Features
The effective water depth is relatively shallow, ranging from 600 to 750 mm.
The hydraulic retention time in the pool is short, ranging from 5 to 10 minutes.
The purification capacity is large, meaning the surface load is high.
It occupies a small area, has a light unit load, and is assembled with prefabricated components. It does not require an operating room, and the equipment can be installed overhead or in multiple layers.
The installation and maintenance costs are low, and it is easy to clean.
The purification efficiency is high, with a suspended matter removal rate, including algae, of more than 90%. The sludge concentration after treatment is 35%.
The device uses a high-efficiency dissolved air system with a compact structure. The system achieves a dissolved air efficiency of up to 90% and has a volume only one-fifth that of conventional dissolved air systems. It also boasts superior anti-blocking capabilities that other dissolved air devices lack.
Application
In the water supply and drainage treatment process, solid-liquid separation technology and equipment are key components. For the removal of tiny suspended particles with a specific gravity close to that of water, air flotation is one of the most effective methods. This equipment is widely used in water supply and drainage treatment projects. First, it is used to remove algae and reduce turbidity in water plants with lakes as water sources. Second, it is applied in industrial wastewater treatment projects, such as in petrochemicals, textiles, printing and dyeing, electroplating, leather making, and the food industry. Third, it is used to recover useful substances from sewage, such as fiber recovery in pulp water in the papermaking industry and other similar fields.
Specification
|
model |
tank diameter |
capacity |
drive motor power |
|
WQF-60 |
φ5 |
50~60 |
1.5 |
|
WQF-100 |
Φ6 |
80~100 |
1.5 |
|
WQF-150 |
φ7 |
120~150 |
1.5 |
|
WQF-200 |
Φ8 |
180~200 |
2.2 |
|
WQF-250 |
φ9 |
220~250 |
2.2 |
|
WQF-300 |
φ10 |
280~300 |
2.2 |
|
WQF-400 |
φ11 |
350~400 |
2.2 |
|
WQF-500 |
φ12 |
450~500 |
3 |
|
WQF-600 |
φ13 |
550~600 |
3 |
|
WQF-700 |
φ14 |
650~700 |
3 |
|
WQF-800 |
φ15 |
750~800 |
3 |
|
model |
scrape motor power |
pump power |
|
WQF-60 |
1.1 |
7.5 |
|
WQF-100 |
1.1 |
15 |
|
WQF-150 |
1.1 |
15 |
|
WQF-200 |
1.5 |
22 |
|
WQF-250 |
1.5 |
22 |
|
WQF-300 |
1.5 |
30 |
|
WQF-400 |
1.5 |
37 |
|
WQF-500 |
2.2 |
45 |
|
WQF-600 |
2.2 |
45 |
|
WQF-700 |
2.2 |
55 |
|
WQF-800 |
2.2 |
75 |
|
model |
air compressor power |
total power |
|
WQF-60 |
1.5 |
11.6 |
|
WQF-100 |
2.2 |
19.8 |
|
WQF-150 |
2.2 |
19.8 |
|
WQF-200 |
4 |
29.7 |
|
WQF-250 |
4 |
29.7 |
|
WQF-300 |
5.5 |
39.2 |
|
WQF-400 |
5.5 |
46.2 |
|
WQF-500 |
7.5 |
57.7 |
|
WQF-600 |
7.5 |
57.7 |
|
WQF-700 |
7.5 |
67.7 |
|
WQF-800 |
11 |
91.2 |
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