Affiliations: Research Center for Eco-Environmental Sciences,
Chinese Academy of Sciences, Beijing 100085, China | Shenzhen Water (Group) Co. Ltd., Shenzhen 518031,
China | Advanced Technology R&D Center, Mitsubishi Electric
Corporation, Japan
Abstract: The effectiveness of preozonation was evaluated on treating a
bromide-bearing dam source water in south China through batch-scale
experiments. Preozonation at ozone doses of 0.5–1.0 mg/L (at ozone
consumption base) enhanced total organic carbon (TOC) removal through
coagulation, and resulted in an almost linear reduction of ultraviolet
absorbance at 254 nm (UV_{254}). The removals of TOC (after
coagulation) and UV_{254} at the ozone dose of 1.0 mg/L were
36% and 70%, respectively. Preozonation at an ozone dose between 0.5 and 1.0
mg/L resulted in the removal of disinfection byproducts formation potential
(DBFP) including trihalomethane formation potential (THMFP) and haloacetic acid
formation potential (HAAFP) for about 50%. The removals of THMFP and HAAFP
decreased with the further increase of ozone dose. Ozonation of bromide-bearing
water (bromide concentration, 34μg/L) produced a bromate concentration under
the detection limit (2μg/L) at ozone doses <1.5 mg/L. However, bromate
<10 μg/L could be produced when the bromide concentration was increased
to 96μg/L.
