As an important equipment in the field of sewage treatment, air flotation machine plays a key role in the process of purifying water quality. I will give you a comprehensive analysis of the air flotation machine from its definition, working principle, type, role and application scenarios. Air flotation machine, full name air flotation separator, is a kind of efficient water treatment equipment that uses tiny bubbles as a carrier to make suspended solids, colloidal particles and other pollutants in the water adhere to it, and then realize solid-liquid and liquid-liquid separation. The core principle is based on physical buoyancy and surface adsorption, which dissolves a large amount of air or other gases into the water, releasing tiny bubbles under certain conditions, which combine with pollutant particles in the water to form gas-solid or gas-liquid mixtures. Because the density of the mixture is less than that of water, it quickly floats to the water surface under the action of buoyancy to form a scum layer, and then the scum is removed by the slag scraping device, so as to achieve the purpose of purifying water quality. According to the different ways of generating bubbles, air flotation machines can be mainly divided into dissolved air flotation machines, dispersed air flotation machines and electrolytic air flotation machines. Dissolved air flotation machine is the most widely used one at present, it first dissolves the air in water under a certain pressure to form supersaturated dissolved air water, when the dissolved air water enters the air flotation tank and is released under reduced pressure, the dissolved air is precipitated in the form of tiny bubbles; The air flotation machine disperses the air into tiny bubbles through impeller stirring, microporous aeration, etc.; The electrolytic air flotation machine uses hydrogen and oxygen bubbles produced by electrolysis of water for air flotation separation. In wastewater treatment, air flotation machines play multiple important roles. First of all, it has a significant effect on the removal of suspended solids. Whether it is sediment, fiber, grease in industrial wastewater, or feces and paper scraps in domestic sewage, the air flotation machine can quickly separate it from the water with the help of the adsorption and buoyancy of bubbles, so that the suspended solids content of the effluent is greatly reduced. Secondly, the air flotation machine has outstanding ability to deal with colloidal substances. Colloidal particles are difficult to settle naturally due to the same charge and mutual repulsion, and in the process of air flotation, the bubbles can destroy the stability of the colloid, so that it can combine with the bubbles and float.In addition, the air flotation machine can also effectively remove some dissolved organic matter and heavy metal ions in the sewage. By adding suitable coagulants and coagulants to the wastewater, the dissolved pollutants form flocs, which are then separated by the combination of air bubbles. At the same time, for some emulsified oil wastewater, the air flotation machine can destroy the emulsified state of the oil droplets, separate the oil substances from the water, and reduce the oil content in the water.

Air flotation machines are widely used in many wastewater treatment scenarios. In the field of industrial sewage treatment, the pulping wastewater of paper mills, the dyeing wastewater of printing and dyeing plants, and the oily wastewater of food processing factories can effectively reduce the pollutant concentration and reduce the load of the follow-up treatment unit after being treated by air flotation; In terms of municipal sewage treatment, the air flotation machine can be used as a pretreatment unit to remove large particles of suspended solids and some organic matter in the sewage, and improve the efficiency of the subsequent biological treatment process; In drinking water treatment, the air flotation machine can remove algae, plankton, etc. in the raw water, improve the water quality, and ensure the safety of drinking water.

Although the air flotation machine performs well in sewage treatment, it also faces some problems in practical applications, such as the need to reasonably select chemicals and operating parameters according to different water quality to avoid poor treatment results or increased operating costs. However, with the continuous advancement of technology, the performance of the air flotation machine will continue to be optimized, play a more important role in the field of sewage treatment, and provide strong support for the recycling of water resources and ecological environmental protection.