DEVELOPMENT OF AN AIR REMOVAL SYSTEM FOR DISSOLVED AIR FLOTATION

Dissolved Air Flotation (DAF) is often used as a separation step in dr inking water treatment. An increasing use of high rate processes has b ecome a trend in chemical treatment. When increasing the loading rate for a flotation process, an increasing head loss built up occurs in th e following filter process due to dispersed air carry over. This paper describes the development of an air removal system by using a lamella plate separation system for the dispersed air. Pilot plant experiment s showed that the surface load for the combination Lamella Dissolved A ir Flotation, the LDAF-unit can be considerably increased in compariso n with a conventional DAF-unit. (C) 1998 IAWQ. Published by Elsevier S cience Ltd.