Dissolved Air Flotation

Dissolved Air Flotation (DAF) is known for the micro air bubbles which are dosed just before the inlet construction in the DAF unit. In its aeration system a part of the treated water together with air are brought under a pressure of 5 bar, where air dissolves in water. By reducing this pressure down to 1 bar in the specially designed and patented depressurasation nozzles small air bubbles of 30-50 micron are formed, which quickly stick to the impurities in the water and therefore cause a high degree of clarification. All impurities rise to the surface and are scraped off there with a automatically operating scraper mechanism.

Nijhuis Water Technology DAF systems differ from the traditional systems by:

• patented clog free depressurasation nozzles
• 60% saving on energy consumption due to unique aeration circuit
• 50% higher dry solids content of the floated sludge by the standard installation of a sludge dewatering grid.
• low overflow rates for a maximum separation efficiency
• simple extension of the system with coagulation/flocculation systems for higher pollution reductions; see the special brochure!

Nijhuis Water Technology, 588 Edward Ave Unit 42, Richmond, ON L4C9Y6. Tel: 905-787-9292; Fax: 905-787-9595.