In the water treatment industry, air flotation equipment is commonly used to separate oil or light suspended solids from water. The working principle of the air flotation equipment is to dissolve air into the reflux water under high pressure in advance, forming a saturated high-pressure steam water mixture. Then, this dissolved steam water is suddenly depressurized and released into the sewage through a dissolved air release device, generating a large number of microbubbles. These microbubbles adhere to the oil or light suspended solids in the water during the rising process, carry them to the water surface, and then use a slag scraping device to scrape the floating slag to the slag removal tank. It is transported to the concentration tank through pipelines, and after concentration in the concentration tank, it is sent to the filter press for dehydration into sludge cake.

The dissolved air flotation device is mainly used as an environmentally friendly water treatment equipment product for solid-liquid or liquid-liquid separation. The air flotation device generates a large number of fine bubbles in water through a dissolution and release system, which adhere to solid or liquid particles with a density close to that of water in wastewater, resulting in a state where the overall density is lower than that of water. It relies on buoyancy to lift it to the water surface, thereby achieving solid-liquid or liquid-liquid separation.

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1. Efficient dissolved air flotation system

The air flotation system integrates water intake, flocculation, separation, water collection, and effluent. Similar to traditional air flotation equipment, it is equipped with a stable flow chamber and a dissolved air release chamber, which makes the treatment performance more stable and the effect more efficient. It is particularly suitable for the transformation of traditional equipment.

Stable chamber: The raw water reacted through folded plates has a high flow rate. If it comes into direct contact with dissolved air water, it will dissipate small bubbles, affecting the adhesion of bubbles to flocs and reducing the efficiency of air flotation treatment. If a stable flow chamber is added, the kinetic energy of turbulent raw water will be consumed and enter the dissolved air water release chamber at a uniform speed, effectively ensuring the removal effect.

Dissolved gas release chamber: The dissolved gas release chamber and the separation chamber are located in the same tank. Separated in the middle, the dissolved air water and the flocculated raw water adhere here, slowly rise, and enter the air flotation separation chamber, ensuring the contact space and time between the floc and the small bubbles, resulting in a high release rate of dissolved air water.

2. Dissolved gas system

For air flotation equipment, the dissolved gas system is like the "heart" of the air flotation equipment and is also the main component of the air flotation equipment. At this stage, gas and water are sucked in together at the inlet of the pump, and are mixed into dissolved gas and water in the dissolved gas tank through impeller shear and pressure. The gas-liquid phase is fully mixed and reaches saturation. The entire dissolved gas system has a gas content of up to 10%, and the gas solubility is high, making the distribution of microbubbles during gas dispersion uniform, with an average bubble diameter of less than 30um. This dissolved gas system is an improvement and technological innovation of traditional air flotation, which improves the separation efficiency of air flotation and greatly reduces the production and operation costs of the equipment.

3. Scraper

The operation mode and speed of the scraper directly affect the water quality of the air flotation effluent and the solid content of the sludge. The system adopts a rotary scraper, which can continuously and uniformly scrape the floating slag into the floating slag tank, reducing the phenomenon of collision between floating slag; In addition, the height adjustable scraper can better adapt to various operating conditions and reduce the moisture content of sludge.

4. Control system

The control system uses electrical components to ensure the effective operation of the equipment.

5. Supporting equipment

Air flotation agents and dosing equipment are also important factors in ensuring treatment effectiveness. We can provide matching dosing equipment and optimized combination agents according to the needs of users.

6. Scope of application of dissolved air flotation device

Paper making wastewater treatment and fiber recycling, printing and dyeing wastewater treatment, electroplating wastewater treatment containing various heavy metal ions, oily wastewater treatment, leather wastewater treatment, chemical wastewater treatment, paint wastewater treatment, food wastewater treatment, biological treatment of mud and water separation, low-temperature and low turbidity surface water treatment, algae containing surface water treatment, solid and liquid separation of other types of wastewater, etc.