Removal of bromide and bromate from drinking water using granular activated carbon

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Granular activated carbon (GAC) was used to remove bromide (Br) and bromate (BrO3) from drinking water in both bench- and pilot-scale experiments. The present study aims to minimize BrO3 formation and eliminate BrO3 generated during the ozonation of drinking water, particularly in packaged drinking water. Results show that the Br and BrO3 levels in GAC-treated water decreased in both bench- and pilot-scale experiments. In the bench-scale experiments, when the empty bed contact time (EBCT) was 5 min, the highest reduction rates of Br in the mineral and ultrapure water were found to be 74.9% and 91.2%, respectively, and those of BrO3 were 94.4% and 98.8%, respectively. The GAC capacity for Br and BrO3 removal increased with the increase in EBCT. Reduction efficiency was better in ultrapure water than in mineral water. In the pilot-scale experiments, the minimum reduction rates of Br and BrO3 were 38.5% and 73.2%, respectively.

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