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Characterization of filter media MnOx[s] surfaces and Mn removal capability

TitleCharacterization of filter media MnOx[s] surfaces and Mn removal capability
Publication TypeJournal Article
Year of Publication2010
AuthorsIslam AA, Goodwill JE, Bouchard R, Tobiason JE, Knocke WR
JournalJournal American Water Works Association
Volume102
Issue9
Start Page71
Pagination71-83
Date Published09/2010
Accession Number53491511
Abstract
Manganese (Mn) control is a significant challenge for utilities, and uptake by oxide-coated media is one commonly used control method. However, there has been only a small amount of research documenting the process and characterization of the oxide-coated media responsible for Mn uptake. This article presents a standard technique to evaluate the Mn uptake capability of filter media and provides increased understanding of the process of Mn uptake by oxide-coated filter media. The Mn uptake capability of filter media can be assessed by a laboratory protocol. Mn uptake capability does not increase consistently because Mn coating levels increase beyond 5-15 mg Mn/g media. Mn oxide coatings can develop readily on both anthracite and sand media and will remain robust for at least six months with no prefilter chlorination. However, Mn release may be a concern. The results of this study will help utility engineers and operators optimize and understand the Mn oxide-coated media process for Mn removal and control.