Dissolved air flotation (DAF) is a proven and effective physical/chemical technology for treating a variety of industrial and municipal process and wastewater streams. DAF systems are commonly used for the removal of oils & greases and suspended solids to meet a variety of treatment goals including: Product recovery and reuse Pretreatment to meet sewer discharge limits Pretreatment to reduce loading on downstream biological treatment systems Polishing of biological treatment effluent Thickening of biosolids