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Evaluation of the use of ferrous iron for chlorite removal under alkaline pH conditions
Chlorine dioxide has gained much attention for use as a
possible alternative disinfectant in water treatment plants
due to concerns regarding trihalomethane formation in
drinking waters which utilize chlorine as the primary
disinfectant and the strict regulations regarding THM's and
THMFP (MCL of 0.080 mg/L for TTHMs) (Pontius, 1993).
Although the use of Cl02 as a disinfectant prevents the
formation of THM's, concern exists regarding the potential
health risks due to the disinfection-by-products of chlorite
he main objective of this project was to study the
removal of chlorite by reaction with ferrous iron under
elevated pH conditions. The stoichiometry of the reaction
was evaluated under the following conditions: solution pH
of 6.0 to 10.0, 02(aq) concentration of 0.5 to 10 mg/L, and
solution DOC concentrations of 0 to 15 mg/L. Mass balances
were conducted to define the speciation of the oxychlorine
residuals associated with the reduction of Cl02 by Fe(II).