Ozonation and Granular Activated Carbon Filtration the Solution to Many Problems
This paper explains how ozone is used in the purification of surface water to potable water both as the first treatment stage and as an intermediary stage for the reduction of organics and as a disinfectant. Taste and odour of the water are improved by the oxidation of both organic and inorganic impurities by ozone. Products resulting from algae metabolisms are shown to be easily oxidised by ozone. The oxidation mechanisms of these oxidation reactions are explained. The importance of the GAC (Granular Activated Carbon) filtration stage after ozonation for the removal of the by-products is highlighted and the complex way in which adsorption takes place is fully described.