BROMATE ION REMOVAL BY ACTIVATED CARBON

Bromate ion removal by powdered activated carbon (PAC) in batch mode a nd granular activated carbon (GAC) in continuous mode was evaluated un der various operational conditions. For PAC, removal kinetics were fou nd to be prohibitively slow, with high PAC doses required; removal imp roved with decreasing pH and decreasing natural organic matter. GAC wa s also influenced by these same water quality conditions, with an addi tional influence by empty bed contact time (EBCT). Bromate ion was fou nd to be reduced to bromide ion and not all bromide in bromate was rec overed supporting the theory that bromate reduction involves non-equil ibrium sorption-reduction mechanisms. Both PAC and GAC results were fo und to be carbon-specific. Copyright (C) 1996 Elsevier Science Ltd