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Abstract
The Hydrozon (R) Kompakt process (ozonation – sand filtration – bromination) relies on bromine (hypobromous acid/hypobromite ion) as the residual disinfectant in swimming pool and bathing water. As it performs its disinfection work, bromide ion is formed. Pool exit water is ozonized, not only to oxidize bather-added contaminants, but also to oxidize bromide ion back to hypobromous acid/hypobromite ions. Consequently, bromine is recycled in the pool water. However, the original process forms brominated hydrocarbons (brominated trihalomethanes), particularly bromoform, in excess of current German drinking water standards for total THMs (25 ug/L).