IMPACT OF OZONATION ON DISINFECTION AND FORMATION OF BIODEGRADABLE ORGANIC-MATTER AND BROMATE

Alternative treatment schemes are being investigated in the context of the future extension of capacity of the Amsterdam Water Supply (AWS). In the preferred scheme, Biological Activated Carbon (BAG) filtration and reverse osmosis play a major role. In order to obtain an impressi on of the ozone doses applicable for BAC filtration (combined ozonatio n and Granular Activated Carbon filtration), several experiments were conducted with the aim of establishing, as a function of the ozone dos e, the extent of (i) bromate formation, (ii) Assimilable Organic Carbo n formation, and (iii) the Ct value achieved. Also investigated was th e extent to which the 'molecular ozone' mechanism for bromate formatio n can describe the formation of bromate al AWS.