Dissolved Air Flotation

The Surface Skimmer on a Dissolved Air Flotation Unit is a key piece for DAF Performance.   The Surface Skimmer typically consists of a series of flight scrapers (skimmer blades) and chain mechanism.  The gearbox mechanism and motor allows for periodic skimming. A Variable Frequency Drive (VFD) is included to adjust the speed of the skimmer…

Bottom Solids Some solids will settle on the bottom of the DAF separation chamber.  When this occurs, these solids need to be removed frequently.  Allowing these solids to accumulate on the bottom of the tank can become septic (anaerobic).  Septic sludge can cause the wastewater pH to decrease as well as produce sulfides which is…

Dissolved Air Flotation Systems are designed to separate solids from the wastewater.  Microbubbles attach to the particulates and float to the surface of the DAF to form a sludge blanket.  We are often asked how thick should we maintain the surface sludge blanket? There are a number of factors that contribute to the thickness of…

The primary pollutants that Dissolved Air Flotation (DAFs) remove from wastewater include Total Suspended Solids (TSS), Fats. Oils, and Greases (FOG) and Insoluble Biochemical Oxygen Demand (BOD).  Insoluble BOD are organic suspended solids that can separate and float to the DAF surface to removal from the system.   The success to dissolved air flotation is attaching…