Removal of Bromate by Ferrous Sulfate Reduction in Drinking Water

Removal of bromate by ferrous sulfate reduction was studied using water plant filter effluent spiked with bromate. Effects of FeSO₄ dosage, reaction time, pH and DO concentration on bromate reduction were investigated. Removal of residue total iron by GAC was also studied. Results showed that, when initial bromate concentration is about 25 mug/L, pH is 7.2, DO concentration is 2.3 mg/L, temperature is (25plusmn1)degC, the concentration of bromate can be reduced to 8.6 mug/L at FeSO₄ dosage of 20 mg/L, which is satisfying with the water quality standard. The GAC filter has a high effect on the total iron´s removal. The concentration of total iron can be reduced from 7.4 mg/L to less than 0.3 mg/L by 1 m high GAC filter column with a EBCTof 20 min.