Surface Characteristics of Sorptive-Filtration Storm Water Media. II: Higher Specific Gravity (ρs > 1.0) Oxide-Coated Fixed Media
Publication: Journal of Environmental Engineering
Volume 127, Issue 10
Abstract
Most current control strategies for storm water treatment utilize fixed or filter-bed media with specific gravity (ρs) greater than 1.0. In contrast to Part I, Part II focuses on such higher density (ρs > 1.0) manganese-oxide-coated media that can be used in combined unit operations and processes for in-situ treatment of storm water. Methods were developed to coat manganese oxides onto sand and cementitious media for storm water treatment. With respect to manganese, coatings of ramsdellite produced a point of zero charge (PZC) of 5.2, while mixtures of birnessite and cryptomelane produced a PZC of 2.6 Manganese oxide increased the specific surface area (SSA) of sand and cementitious media. Manganese-oxide-coated sand (MOCS) produced a larger SSA (2.48-m2/g), as compared with birnessite-coated media (BCM) (1.51 m2/g), while the two have a similar surface charge (PZC = 6.4). Manganese-oxide-coated cementitious media (MOCM) produced a significantly larger SSA (19.49 m2/g), as compared with coated sand, and SEM analyses indicated the surface contained manganese oxide and calcite of thickness 10–30 μm. Based on the results, coated cementitious media provided surface characteristics that can significantly enhance filtration and adsorption of heavy metal in storm water, in comparison to sand.
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Information & Authors
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Published In
Journal of Environmental Engineering
Volume 127 • Issue 10 • October 2001
Pages: 879 - 888
History
Received: Sep 27, 2000
Published online: Oct 1, 2001
Published in print: Oct 2001
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