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Pages 45-51

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From page 45...
... 45 Highway runoff can contain dissolved and particle-bound metals at concentrations that require treatment, nominally with a unit process such as adsorption and unit operation such as sedimentation or filtration, respectively. The sources, magnitude, as well as the partitioning and distribution of these metals with particles have been reviewed.
From page 46...
... 46 There are a variety of infiltration BMP systems that range from permeable pavement to sand filter inlets (Urbonas 1993)
From page 47...
... 47 In selecting a media the potential viability in an adsorptivefiltration system will be dependent upon the following factors: 1. Structural (required shear, compressive, and stability/ degradation properties subject to cyclic wetting/drying and anaerobic/aerobic conditions)
From page 48...
... 48 For example, an oxide-coated media surface with a net negative charge is preferred to remove the dissolved metals that exist as cations in stormwater. Despite the high affinity of iron oxide for metal ions, iron oxide has not been widely used as a surface complexation media for stormwater because its physical properties are not conducive to this process.
From page 49...
... 49 While concrete media alone without an oxide coating or admixture is temporarily effective, the mass transfer is that of precipitation resulting in an unstable buildup of metals on the media surface with such physical precipitate buildup being sloughed off periodically into the effluent. This result is also observed for metal precipitates on concrete media (Liu et al.
From page 50...
... Zn Cu Cd Pb X/Mb mg/g (mg/ml)
From page 51...
... 51 adsorptive performance for dissolved metal (or other solutes) removal is unknown and may present environmental/ecological challenges through the leaching or desorption of metals or in the case of biogenic pelletized materials, nutrients.

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