The role of chloramines in enhancing soluble manganese removal by manganese contactors by W.R. Knocke, A.M. Weber, P.H. Hargette and E. Odom

Abstract Manganese (Mn) contactors have previously been shown to be quite effective in removing dissolved Mn from drinking water. To date, the contactor media regenerated by application of free chlorine, either continuously contactor-applied water or via offline regeneration. This research study was first evaluate potential role chloramines for online regeneration MnOx(s)-coated media. Testing initially at bench scale and then subsequently over 6 months pilot demonstrated that were promoting significant Pilot-scale data showed presence addressed approximately 80% requirements, allowing addition chlorine following backwashing address remaining oxidant needs Hydraulic loading rates up 39 m/hr (16 gpm/ft2) could employed still produce highly removal. The means which these results can applied other treatment situations are also discussed.