The application effect of air flotation machine in sewage treatment depends on its design, operating conditions, and the characteristics of the wastewater to be treated. Here is some information about the application effects of air flotation machines in different sewage treatment scenarios:
Electrolytic air flotation equipment: This equipment uses tiny bubbles generated by electrolysis for solid-liquid separation and is suitable for treating organic wastewater. In addition to reducing BOD, it also has the effects of oxidation, decolorization, and sterilization. However, the electrolytic air flotation equipment has the problems of high energy consumption and electrode loss, which limits its promotion and use.
Scattered air flotation equipment: suitable for treating wastewater containing small particles and flocs, with an air flotation time of about 30 minutes and a dissolved air volume of up to 0.51m3/m3 (air/water), suitable for various industries such as food processing, textile, mechanical processing, etc. The removal rates of COD and BOD are between 43.38% and 89.1%, the removal rate of SS is between 90% and 99.8%, and the removal rate of oil is between 78% and 99.3%.
Pressure dissolved air combined air flotation equipment: with a processing capacity of about 30-150m3/h, after adding appropriate chemical agents, the COD and SS removal rates of the treated wastewater are both around 80%.
Shallow pool air flotation equipment: It has the "zero velocity principle", which allows the flotation body to float vertically to the water surface in a relatively static environment, achieving solid-liquid separation. Suitable for industries such as paper white water recycling, leather making, textiles, and food, with a suspended solids removal rate of over 92.8% and a COD removal rate of over 65.3%.
Micro bubble swirling flow air flotation device: used to treat polymer containing wastewater in Daqing Oilfield. Through the combined effect of micro bubble swirling centrifugal force and air flotation buoyancy, it achieves the aggregation and adhesion of oil droplets and impurities, and quickly and efficiently separates and removes oil and suspended solid impurities.
Vortex concave air flotation machine (CAF): suitable for treating urban and industrial wastewater, with advantages such as energy saving, high efficiency, and easy operation. The removal rate of oil and suspended solids exceeds 95%, and the removal rate of COD can reach 75-85% or more.
dissolved air flotation machine (DAF): suitable for treating water with low turbidity, high chromaticity, high organic content, low oil content, low surface active substance content or rich algae, widely used in industrial wastewater treatment such as papermaking, printing and dyeing, electroplating, chemical industry, food, refining, etc.
How effective is the application of floating machines in different sewage treatment scenarios?
In summary, air flotation machines have shown good application effects in different sewage treatment scenarios, especially in removing suspended solids, oils, and organic matter. However, there are differences in energy consumption, operational complexity, and adaptability to specific types of wastewater among different types and designs of air flotation machines. Choosing the appropriate type of air flotation machine and optimizing operating conditions are crucial for improving sewage treatment efficiency.
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