[Impact of Ammonia and H 2 O 2 on Bromate and Disinfection By-products Control].

A pilot-scale study with conventional water treatment and ozone-biological activated carbon (O ₃ -BAC) treatment was conducted to evaluate the impact of ammonia and hydrogen peroxide (H ₂ O ₂ ) addition on the bromate and disinfection by-products formation potential (DBPFP) control, with bromide containing water as raw water. It was found that bromate concentration would exceed 10.00 μg·L ^-1 as ozone doses were higher than 1.0 mg·L ^-1 under different water qualities. Ammonia and H ₂ O ₂ could effectively control bromate formation and bromate concentration decreased as ammonia and H ₂ O ₂ doses increased. Bromate concentration could be controlled below 10.00 μg·L ^-1 as ammonia dose was 0.10-0.30 mg·L ^-1 or the m (H ₂ O ₂ )/ m (O ₃ ) was 0.2-1.0. However, as ammonia-H ₂ O ₂ was combined for the same purpose, bromate increased firstly and then decreased. Ammonia addition would not significantly affect the THMFP control but H ₂ O ₂ application would depress the efficiency of THMFP removal.