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[II]) 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 by‐product of the Fe(II)‐ClO2− reaction had no adverse effect on alum coagulation for the removal of turbidity and dissolved organic carbon.
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Iatrou et al. (1992) studied this question.
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