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ClariDAF is a high-rate DAF process which can operate at loading rates of 8 to 15 gpm/ft2. Clarification rates for this system are based on flow per square foot area occupied by the effluent laterals located 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 ClariDAF system utilizes a rapid mix zone where polymer may be added followed by one or more flocculation basins and a DAF Cell. An internal angled baffle wall creates 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 the laterals and into an effluent channel while the sludge blanket is mechanically skimmed into a collection channel. Characteristics of the ClariDAF 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 ITT WWW Leopold, September 2007)

Process Flow Diagram (Provided by ITT WWW Leopold, September 2007)

View Typical System Drawings (Provided by ITT WWW Leopold, September 2007)