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AWWA JAW62924
- Journal AWWA - Sequential Manganese Desorption and Sequestration in Anthracite Coal and Silica Sand Filter Media
- Journal Article by American Water Works Association, 05/01/2006
- Publisher: AWWA
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The Metropolitan Water District of Southern California carried out a study to evaluatemanganese (Mn) desorption from filter media during biological filtration startup. Mncontamination of the filter media was a byproduct of prior use of ferric chloride (FeCl<sub>3</sub>), whichcontains Mn, for coagulation and free chlorine exposure. During pilot- and full-scale testingat pH 6.5, FeCl<sub>3</sub> coagulation (without chlorine) released soluble Mn at nearly four times thelevel released by aluminum sulfate (alum; 105 µg/L for FeCl<sub>3</sub> and 27 µg/L for alum). Pilot-scaleexperiments demonstrated that Mn was present in the filter column in three valence states[Mn(II), Mn(III), and Mn(IV)]. Mn(II) in the filter influent was from the FeCl<sub>3</sub>. Mn on theanthracite media was hypothesized to be Mn(II)/Mn(IV) and first physically displaced by ferriciron, aluminum, and hydrogen, and then catalytically oxidized to Mn(IV) by silica sand. Includes 39 references, tables, figures.
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