1997/08/01 by Gregory H. Hurst, William R. Knocke
Environmental Science · #Water Treatment and Disinfection
paper · doi:10.1002/j.1551-8833.1997.tb08280.x
crossref issued 1997/08/01 · crossref published 1997/08/01 · crossref published-online 1997/08/01 · crossref published-print 1997/08/01 · openalex publication_date 1997/08/01 · crossref created 2018/02/22 · crossref deposited 2023/09/24 · openalex created_date 2025/10/10 · crossref indexed 2026/07/29 · openalex updated_date 2026/07/29
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 – .