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Proposed drinking water regulations will specify a maximum contaminant level of 0.01 mg/L for bromate ion (BrO3-). This study used high-energy electron-beam irradiation to remove BrO3- after formation, when other control strategies are not as effective. BrO3- was reduced to bromide ion (Br-), with bromine (HOBr/OBr-) as intermediate. A dose of 60 krads was sufficient to reduce 70 percent of BrO3- from an initial concentration of 100 ug/L. The presence of electron scavengers such as hydrogen peroxide and nitrate, significantly reduced BrO3- removal, whereas the addition of an OH radical scavenger such as t-butanol did not affect the removal of BrO3-. This indicates that aqueous electrons are mainly responsible for BrO3- destruction. The presence of natural organic matter decreased BrO3- reduction efficiency. The reaction of aqueous electrons with various bromine species in water was used to model and simulate experimental data for the destruction of BrO3-. Computer model predictions were in fairly good agreement with the experimental results. Includes 21 references, tables, figures.

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Edition: Vol. 88 - No. 10 Published: 10/01/1996 Number of Pages: 12File Size: 1 file , 1.2 MB