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Full-Text Articles in Engineering
Fate Of Heavy Metals From Highway Runoff In Stormwater Management Systems, Harvey H. Harper
Fate Of Heavy Metals From Highway Runoff In Stormwater Management Systems, Harvey H. Harper
Retrospective Theses and Dissertations
The movement and fate of heavy metal inputs (Cd, Zn, Mn, Cu, Al, Fe, Pb, Ni and Cr) from highway runoff were investigated in a three-year study on 1.3 hectare retention facility near the Maitland Interchange on Interstate 4, north of Orlando, Florida. Physical characteristics of the retention pond and surrounding watershed were defined and field instrumentation was installed. Stormwater samples were collected over a one-year period, representing a wide range of intensities and antecedent dry periods. Stormwater characteristics were compared with average retention pond water quality to determine removal efficiencies for heavy metals within the pond. A total of …
Speciation Of Heavy Metals In Highway Drainage Systems, Lee P. Wiseman
Speciation Of Heavy Metals In Highway Drainage Systems, Lee P. Wiseman
Retrospective Theses and Dissertations
A trace metal speciation scheme proposed by Batley and Florence (1976) was applied to determine the physiochemical forms of zinc, cadmium, lead, and copper in two Central Florida highway drainage systems. The linearity and limitations of the ASV technique were also examined. The measurements showed that (a) more than 70% of the soluble Zn and Cd in all of the waters analyzed existed as liable ionic metal (b) lead was divided between labile and non-labile inorganic forms, but one particular form, PbCO3, predominated (c) a substantial fraction of copper is associated with organic colloids if humic substances are …
Metal Leaching Characteristics Of Three Synthetically Generated Metal Finishing Sludges, Christopher M. Cherniak
Metal Leaching Characteristics Of Three Synthetically Generated Metal Finishing Sludges, Christopher M. Cherniak
Retrospective Theses and Dissertations
A study was performed involving the leaching characteristics of three synthetically-generated metal finishing sludges. Three precipitates (one hydroxide, two sulfide-based) containing varying concentrations of cadmium, copper, lead, nickel and zinc were dewatered and subjected to an EPA-regulated limits. The sludge generated from an insoluble sulfide process exhibited the fewest parameters in violation (two), while the soluble sulfide sludge had one metal in compliance and the hydroxide sludge had none. On a metal-by-metal basis, the lead and copper exhibited the greatest capacity to withstand resolubilization in a low pH (5) environment. Nickel and zinc were present at the highest leachate concentrations …