Full Description

Formation of hydroxyl radicals (HOsup./sup) and bromate during ozonation is stronglyinfluenced by water quality and treatment variables. Quantification of HOsup./sup wasdetermined by introducing the RsubCT/sub value, expressed as a ratio of HOsup./sup exposure (orconcentration) to ozone exposure (or concentration). Two phases of RsubCT/sub were performedand the values of RsubCT/sub remain unchanged at any specific time throughout the ozonationprocess with a set of water quality. Linear relationships were observed between extentsof water quality parameters and HOsup./sup concentration or rate of bromate formation. Bromateformation can be controlled by adding acid or ammonia to depress intermediate OBrsup-/sup.Acid addition to lower water pH from ambient (8.2) to 7.5 and 6.5 reduced bromateformation by 30% and 80%, respectively. In comparison, adding ammonia reducedbromate formation up to 60% and 85% at pH 7.5 and 8.5, respectively. Ammonia's efficiency to mitigate bromate formation was lessened with lowered water pH. Includes 7 references, tables, figures.

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Edition: Vol. - No. Published: 11/02/2003 Number of Pages: 9File Size: 1 file , 270 KB