The performance of Colloide's Dissolved Air Flotation (DAF) unit is superior to that of similar or alternative technologies, both as a clarifier of primary or secondary effluent waters and as a thickener for biological sludge.

The simplicity of the design of the AQUA-DAF system is at the core of its high operational reliability and versatility.

The circular low head geometry of the cell, innovative hydrodynamics of fluids entering and exiting the cell, and the proven efficiency of the floating sludge removal system all contribute to the excellent performance of this DAF system.

Process

  • Feed stream, after saturation with dissolved air, is introduced into the flotation cell.

  • Flow spreads uniformly across the tank.

  • Micro air bubbles adhere to the suspended particles creating a floating action on these particles. A thick blanket is formed by the solids at the surface of the cell. These solids are removed using a scum removal system.

  • Before reaching the outlet slots, the under-natant is forced to pass through a filtering bed consisting of a relatively deep section of micro-bubbles.

  • Any heavy solids which might have settled are conveyed into a sump by the bottom scraper.

Features

  • Air dissolving system with efficiency > 90%

  • High sludge concentration

  • Construction in 316 and other stainless steel grades possible

  • Sludge blanket thickness control system

  • High loading rates up to 15m3/m2h and 25kg SS/m2

  • High tolerance to flow and / or solids input variations

  • FRP / titanium construction for special applications

  • Unsurpassed degree of clarification

  • 304L stainless steel construction for all wetted surfaces

  • Installation into an existing / new concrete basin

Applications

Drinks industry

  • Oil and grease removal and juice clarification

Paper industry

  • White water clarification / fibre recovery

Water and wastewater

  • Primary and secondary clarification

  • Sludge thickening

  • Refinery oily wastewater treatment

  • Surface waters clarification

  • Algae removal