Ozonation of iodide-containing waters: Selective oxidation of iodide to iodate with simultaneous minimization of bromate and I-THMs

• Published in: Water research (Oxford) 2013-04, Vol.47 (6), p.1953-1960
• Main Authors: Allard, S., Nottle, C.E., Chan, A., Joll, C., von Gunten, U.
• Format: Article
• Language: English
• Subjects: Applied sciences; Bromate; Bromates; Bromates - analysis; Bromates - chemistry; Bromides - analysis; Bromides - chemistry; Byproducts; Chlorination; Drinking water; Drinking Water - chemistry; Drinking Water - standards; Drinking water and swimming-pool water. Desalination; Exact sciences and technology; Fresh Water - chemistry; Groundwater - chemistry; Guidelines as Topic; Humic Substances - analysis; Hydrogen-Ion Concentration; I-DBPs; I-THMs; Iodate; Iodates; Iodates - analysis; Iodates - chemistry; Iodide; Iodides; Iodides - analysis; Iodides - chemistry; Kinetics; Mutagens - analysis; Mutagens - chemistry; Oxidants, Photochemical - chemistry; Oxidation; Oxidation-Reduction; Ozone; Ozone - chemistry; Pollution; Trihalomethanes - analysis; Trihalomethanes - chemistry; Waste Water - chemistry; Water Pollutants, Chemical - analysis; Water Pollutants, Chemical - chemistry; Water Purification - methods; Water Quality; Water treatment and pollution
• ISSN: 0043-1354; 1879-2448
• DOI: 10.1016/j.watres.2012.12.002

The presence of iodinated disinfection by-products (I-DBPs) in drinking water poses a potential health concern since it has been shown that I-DBPs are generally more genotoxic and cytotoxic than their chlorinated and brominated analogs. I-DBPs are formed during oxidation/disinfection of iodide-containing waters by reaction of the transient hypoiodous acid (HOI) with natural organic matter (NOM). In this study, we demonstrate that ozone pre-treatment selectively oxidizes iodide to iodate and avoids the formation of I-DBPs. Iodate is non-toxic and is therefore a desired sink of iodine in drinking water. Complete conversion of iodide to iodate while minimizing the bromate formation to below the guideline value of 10 μg L−1 was achieved for a wide range of ozone doses in five raw waters with DOC and bromide concentrations of 1.1–20 mg L−1 and 170–940 μg L−1, respectively. Lowering the pH effectively further reduced bromate formation but had no impact on the extent of iodate and bromoform formation (the main trihalomethane (THM) formed during ozonation). Experiments carried out with pre-chlorinated/post-clarified samples already containing I-DBPs, showed that ozonation effectively oxidized I-THMs. Therefore, in iodide-containing waters, in which I-DBPs can be produced upon chlorination or especially chloramination, a pre-ozonation step to oxidize iodide to iodate is an efficient process to mitigate I-DBP formation. [Display omitted] ► O3 oxidizes I− to IO3− and avoids the formation of I-DBPs. ► Complete oxidation of I− by O3 while keeping BrO3− below the drinking water standard. ► Lowering pH reduced BrO3− formation but had no impact on IO3− and CHBr3 formation. ► O3 didn't oxidize Cl–Br-THMs but oxidized I-THMs. ► O3 is an efficient process to mitigate I-DBP formation.