AWWA JAW34105
Journal AWWA - Removing Chlorite by the Addition of Ferrous Iron
Journal Article by American Water Works Association , 11/01/1992
Iatrou, Angela;Knocke, William R.
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The application of chlorine dioxide in water treatment has been limited because of concerns about the health effects of residual chlorite (ClO2-) and chlorate. This study investigated the feasibility of using ferrous iron (Fe[III]) to reduce chlorite concentrations. Laboratory tests indicated a required reaction stoichiometry of 3.0-3.1 mg Fe(II)/mg ClO2-. The reaction rate was rapid for pH values of 5 and greater. Interference from dissolved oxygen was minimal. The ferric hydroxide solids produced as a byproduct of the Fe(II)-ClO2- reaction had no adverse effect on alum coagulation for the removal of turbidity and dissolved organic carbon. Includes 11 references, tables, figures.
