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Removing Chlorite by the Addition of Ferrous Iron

Iatrou, Angela / Knocke, William R.

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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Removing Chlorite by the Addition of Ferrous Iron

Iatrou, Angela / Knocke, William R.

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.

Removing Chlorite by the Addition of Ferrous Iron

Iatrou, Angela / Knocke, William R.

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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Title:

Removing Chlorite by the Addition of Ferrous Iron

Contributors:

Iatrou, Angela (author) / Knocke, William R. (author)

Published in:

Journal ‐ American Water Works Association ; 84 ; 63-68

Publication date:

1992-11-01

Size:

6 pages

ISSN:

1551-8833 , 0003-150X

DOI:

https://doi.org/10.1002/j.1551-8833.1992.tb05883.x

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

Coagulation , Residual Chlorine , Alum , Iron , Turbidity , Disinfection Byproducts , Chlorine Dioxide , pH , Dissolved Oxygen , Organic Carbon

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