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Overview

A method and apparatus for the on-site production of ferrate for water purification and wastewater treatment are discussed.To generate ferrate only requires the oxidation of Fe³⁺ to ferrate(+6) using a patented Ferrator.When used, the Ferrator reduces the chem. cost of 1 lb of ferrate to ∼$5 (US dollars), making its water/wastewater treatment use affordable.Specifically, a ferric salt (FeCl₃, Fe₂[SO₄]₃) is oxidized to FeO₄^2- by hypochlorite (calcium hypochlorite, sodium hypochlorite) in the presence of NaOH.Feed stocks are inexpensive and readily available at most treatment facilities in com. forms (12% bleach, 40% FeCl₃/Fe₂(SO₄)₃, 50% caustic).When added to an aqueous system, ferrate(6+) is a powerful oxidant which readily decomposes to Fe³⁺ (Fe[OH]₃) and O₂.Due to its multi-treatment capacity, it is difficult to generalize optimum doses for each application.Treatment applications include decolorization, heavy metal removal, disinfection.

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