Potential of Ferrate(VI) in Enhancing Urban Runoff Water Quality
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Urban development and increasing water demand are putting a lot of stress on existing water resources around the world. A great deal of attention is now paid to alternative sources of water such as stormwater catchment systems as they serve multi-purpose functions. However, human activities introduce a variety of contaminants into the stormwater catchments, which affect the quality of the water to be used for both potable and non-potable purposes. Environmentally friendly treatment technologies are needed to treat and to use urban runoff without having negative impacts on the environment. Ferrate (VI) technology has the potential to be one of the most environmentally friendly water treatment technologies of the twenty-first century. Ferrate(VI) has advantages in treating heavy metals (e.g., Pb2+, Cd2+, Cr3+, Hg2+, Cu2+, and Mn2+), suspended particles, synthetic/natural organic matter (present as TOC, BOD and COD), microorganisms (e.g., bacteria and virus), without producing chlorinated by-products. Ames test on ferrate(VI) treated water demonstrated negative results, suggesting no mutagenic by-products. Uniquely, Ferrate(VI) performs distinctly different treatment functions (oxidation, coagulation, flocculation, and disinfection) from the application of a single dose, thus providing a simplified and cost-effective process. 2008 American Chemical Society.
