Dissolved Air Flotation machine advection advection DAF machine is commonly used as a sewage treatment industry solid-liquid separation equipment, can effectively remove suspended solids in sewage, grease, glue-like substances, is the main equipment of sewage pre-treatment . First, the structural characteristics: the device body is rectangular steel structure. The main components by dissolved air pump, air compressor, dissolved gas cylinders, rectangular box, flotation system, scraper system components. 1. dissolved gas cylinders tiny bubbles, particle size 20-40um, floc adheres firmly to achieve a good flotation effect; 2. flocculant use less, cost reduction; 3. rules easy to grasp, water quality and quantity easy to control, simple to manage. 4. There backwash system, the release is easy to plug. Second, the principle: dissolved gas cylinders produce dissolved gas and water, dissolved air by releasing water pressure is released into the water to be treated. Air dissolved in water is released from the water to form tiny 20-40um fine bubbles, microbubbles combined with sewage suspended solids, suspended solids so that gravity less than water, and gradually form a scum floats to the surface. On the surface of the water with scraper system will scum scraped into the sludge pool. Water from the bottom through the overflow tank into the clear pool. Third, the use of: 1. for the removal of suspended solids in sewage, oil and all kinds of jelly, such as: petrochemicals, coal, paper, printing and dyeing, slaughtering, brewing wastewater treatment and other industrial enterprises; 2. recover useful for substances, such as: White Water collected in fines.