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Bromate formation and BAC removal in drinking water treatment process
M.ASAMI,T.AIZAWA,T.MORIOKA,N.HASHIMOTO,W.NISHIJIMA,A.TABATA,Y.MAGARA 嶺南大學校 環境問題硏究所 1997 環境硏究 Vol.17 No.1
AbstractOzonation of water that has been effected by seawater intrusion or bromide contamination, inevitably results in significant bromate formation. Seasonal changes in bromate formation in water containing a high concentration of bromide were investigated at an experimental ozonation plant. When operational ozone conditions were set to maintain ozone residue at a constant level, bromate formation was significantly correlated with temperature, E260, color, and ozone dose. In GAC(granular activated carbon) column experiments, the bromate removal rate apparently decreased during transition from GAC to BAC (biological activated carbon) following ozonation. Batch experiments confirmed GAC's capacity and BAC's inability to reduce bromate ions to bromide ions. Ozonation conditions must be optimized to minimize bromate and other by-products'formation while maintaining target levels of substance removal.