As the core equipment of modern wastewater treatment, the air flotation machine converts air into a group of microbubbles through foaming technologies such as dissolved air release and mechanical aeration, efficiently capturing pollutants. From high concentration wastewater to fine separation scenarios, its adaptability, energy efficiency ratio, and automation advantages are obvious. This article introduces the common foaming methods and technical characteristics of air flotation machines. Let's take a look together.

1. Shallow air flotation machine

Using dissolved gas release technology, air is forcibly dissolved in water through a high-pressure dissolved gas tank (0.3-0.5MPa) to form supersaturated dissolved gas water. After being depressurized by the release device, the dissolved water releases a group of microbubbles with a diameter of 10-50 μ m, which combine with pollutants and float up for separation. Its core advantage lies in the shallow pool design (water depth 600-800mm), with a separation time of only a few minutes, suitable for the treatment of high concentration wastewater such as papermaking and food.

2. Vortex concave air flotation machine

Bubbles are generated through mechanical aeration, and the impeller of the vortex concave aerator rotates at high speed (2900rpm) to form a negative pressure zone, sucking in air and cutting it into micro bubbles of 20-50 μ m. Bubbles directly combine with pollutants without the need for high-pressure gas dissolution systems, resulting in low energy consumption. However, the bubble particle size is relatively large (100-200 μ m), making it suitable for scenarios such as oily wastewater and slaughter wastewater. The oil removal rate can reach 95%.

3. Dissolved air flotation machine

Divided into two types: pressure dissolved gas and jet dissolved gas:

Pressure dissolved gas: The air compressor presses air into the dissolved gas tank, mixes it with the reflux water to form dissolved gas water, and releases 10-100 μ m bubbles after pressure reduction.

Jet dissolution: using high-speed water flow to suck in air and shear and break it, forming microbubbles.

This device has high processing efficiency and is suitable for fine separation of small water volumes (<500m ³/d), such as printing and dyeing, electroplating wastewater.

Shallow air flotation machines, vortex concave air flotation machines, and dissolved air flotation machines generate microbubbles through dissolved air release, mechanical aeration, and pressure/jet dissolved air technology, respectively, and are suitable for wastewater treatment of different concentrations and properties. Shallow air flotation machine is suitable for high concentration wastewater, vortex concave air flotation machine has low energy consumption, and dissolved air flotation machine has high treatment efficiency. Users can choose the appropriate type of air flotation machine according to their actual needs.