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Evaluating Ferrous Iron for Chlorite Ion Removal
Author(s) -
Hurst Gregory H.,
Knocke William R.
Publication year - 1997
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1997.tb08280.x
Subject(s) - chlorine dioxide , chlorate , ferrous , chemistry , chlorite , chlorine , inorganic chemistry , chloride , ion , disinfectant , nuclear chemistry , metallurgy , materials science , organic chemistry , quartz
Fe(II) dosing proves an efficient technique for removing ClO2 – over a wide range of conditions. Effective use of chlorine dioxide as an alternative disinfectant in water treatment may require removal of the by‐product chlorite ion (ClO2 – ). This study evaluated the effect of alkaline conditions (pH 7–10) and the presence–absence of dissolved oxygen on the ability of ferrous iron [Fe(II)] to reduce ClO2 – ion to chloride ion (Cl – ). Fe(II) dosing from 3.5–4.0 mg Fe(II) per mg ClO2 – provided for efficient removal of ClO2 – over the targeted pH range. Furthermore, no by‐product formation of chlorate ion was observed. Results from mass balance studies indicated that approximately 95 percent of the reacting ClO2 – was chemically reduced to Cl – .