DAF Dissolved Air Flotation Solid Liquid Separator Machine for Industrial Wastewater Our DAF Dissolved Air Flotation Solid Liquid Separator Machine (Model DAF-SL Series) is a complete flotation clarification package for ETP (Effluent Treatment Plant) applications in oily wastewater, petrochemical, food processing, electroplating and chemical industries. The system dissolves air under pressure and releases it as millions of micro-bubbles that attach to suspended particles,