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AWWA ACE60047
- The Use of Ferrous Chloride for the Reduction of Chlorite and as an Alternative Coagulant
- Conference Proceeding by American Water Works Association, 06/17/2004
- Publisher: AWWA
$12.00$24.00
The formation of the chlorine dioxide (ClO<sub>2</sub>) byproduct chlorite (ClO<sub>2</sub><sup>-</sup>) ion typically limits themaximum ClO<sub>2</sub> dose to ~1.25 mg/L to reliably ensure that ClO<sub>2</sub><sup>-</sup> levels do not exceed its maximumcontaminant level of 1.0 mg/L. This ClO<sub>2</sub> dose may be inadequate to meet disinfectionrequirements in waters exhibiting high demands. This study evaluated the use of ferrouschloride (FeCl<sub>2</sub>) to significantly reduce ClO<sub>2</sub><sup>-</sup> levels following treatment with high doses ofClO<sub>2</sub>. In addition, the effect of FeCl<sub>2</sub> alone and in combination with ferric chloride as analternative coagulant on overall coagulation-filtration treatment process performance was studiedat a 5.5-mgd demonstration-scale plant. Data were developed to enable a balancing ofdisinfection, disinfection byproduct formation, and filtration requirements at full-scale facilities. Includes 15 references, tables, figures.
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