DAF is a unit operation for separation of solids and semisolid (floc) particles from the water. Saturated air-water mixture is injected in bottom of the tank containing water to be treated (which is already coagulated and flocculated). The sudden decrease in pressure of the saturated air-water mixture caused release of micro-bubbles, typically 10 to 50 micron. The micro bubbles adhere to or enmesh in the suspended composite particles, which then rises to the surface because of their reduced density and form a layer of solids known as float. Skimming operation removes the float.

N-R DAF Clarifiers are most effective solid-liquid separation units for applications involving low-temperature water, low to moderate turbidity water producing low-density floc and for separation of low-density colloidal matter. They are small, compact and robust, has small footprint and utilize the space most efficiently. The clarifiers come with highly efficient saturated water distribution system; and high efficiency DAF recirculation pumps or saturation vessels to produce water supersaturated with air. The NR-DAF clarifier and auxiliary equipment are easy to install, operate and maintain.