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Manganese As a Metal Accumulator
Citation:
Schock, M. Manganese As a Metal Accumulator. Presented at American Water Works Association Annual Conference and Exhibition, Anaheim, CA, June 07 - 10, 2015.
Impact/Purpose:
Invited presentation to describe the mechanisms by which manganese deposits in drinking water distribution systems can accumulate and release metals, radionuclides and oxyanions. It is in a special session, so it sets up important background information.
Description:
Manganese deposits in water distribution systems accumulate metals, radionuclides and oxyanions by a combination of surface complexation, adsorption and solid substitution, as well as a combination of oxidation followed by manganese reduction and sorption of the oxidized constituent. Descriptions are given of some recent studies that assessed and estimated the amount of Mn deposit in a large number of water distribution systems, which showed the magnitude of possible problem. The deposits are reversible and can cause difficulty with LCR compliance but also act as a source for unknown amounts of exposure to these nonconservative water parameters. Literature is reviewed showing the well-known nature of the phenomenon of accumulation in the geosciences and limnology, some mineral equilibria for Mn and suggest precautionary measures for a water system to take to minimize potential health or aesthetic problems.
URLs/Downloads:
http://www.awwa.org/conferences-education/conferences/annual-conference/ace15-professional-program.aspx#