Risk Assessment of Metal Leaching into Groundwater from Phosphate and Thermal Treated Sediments
Publication: Journal of Environmental Engineering
Volume 136, Issue 4
Abstract
Beneficial reuse as an alternative to disposal is increasingly being considered in management of contaminated sediments dredged from harbors. The risk of metal leaching into groundwater in reuse of phosphate and thermal treated sediments was assessed with sequential extraction, synthetic precipitation leaching procedure (SPLP), and leaching as a function of pH and liquid to solid ratio (L/S). Sequential extraction revealed that phosphate addition at 5% by dry weight, followed by calcination at reduced metal association with exchangeable/carbonate and organic phases and increased that with sparingly soluble residuals. Over the pH range 4 to 9, metal leachability varied by two to four orders of magnitude while varying L/S over 5 to 100 showed little difference. The SPLP revealed that risk to groundwater criteria based on applying a dilution attenuation factor (DAF) of 13 (New Jersey) to groundwater quality levels were achieved. Risk criteria based on a DAF of 1 (Florida and Wisconsin) were exceeded for Pb, Cd, and Mn; thermodynamic analysis demonstrates that the criteria cannot be satisfied should dissolution control pore water concentrations.
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Acknowledgments
The writers gratefully acknowledge the New Jersey Water Resources Research Institute (NJWRRI) for their grant which supported this research and the New Jersey Office of Maritime Resources for supplying Passaic River Estuary sediments.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 136 • Issue 4 • April 2010
Pages: 427 - 434
Copyright
© 2010 ASCE.
History
Received: Jan 17, 2009
Accepted: Sep 28, 2009
Published online: Sep 30, 2009
Published in print: Apr 2010
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