EE&T  |  Water Research Foundation
  Home > AquaDAF




AquaDAF is a high rate dissolved air flotation system designed by Infilco Degremont, Inc. (IDI) which can operate at loading rates of 8 to 16 gpm/ft2, as piloted in Foundation Project # 3114. Clarification rates for this system are based on flow per square foot area of the false floor at the bottom of the DAF cell. A clarification rate defined in this manner does not account for the increased footprint due to remainder of the system's components. The process was developed by the Rictor Company in Sweden and licensed to IDI in 2001. AquaDAF utilizes dual flocculation chambers where polymer may be added followed by a DAF Cell. An internal angled baffle wall and a false floor create a recirculation effect throughout the DAF Cell which increases bubble density and efficient flotation for removal of the "float". The clarified water exits the system through a patented hole-patterned piping on the false floor and out an effluent channel while the float material can be collected mechanically or hydraulically. Characteristics of the AquaDAF system demonstrated during this study include:

  • Hydraulic loading rate (expressed as described above) of 14 gpm/ft2 or greater
  • Achieved performance objectives of median turbidity <1 ntu and 95th percentile turbidity <2 ntu
  • Required polymer addition and about 15 minutes of flocculation time to meet above performance objectives
  • Residual solids of 3 to 4 percent solids


Process Schematic (Provided by Infilco Degremont, September 2007)

View Typical System Drawings (Provided by Infilco Degremont, September 2007)