In Situ Source Treatment of Using a -Based Reductant Blend: Long-Term Monitoring and Evaluation
Publication: Journal of Environmental Engineering
Volume 134, Issue 8
Abstract
The long-term effectiveness of an reductant solution blend for in situ saturated zone treatment of dissolved and solid phase in a high pH chromite ore processing solid waste fill material was investigated. Two field pilot injection studies were conducted that showed sustained treatment of over evaluation periods of more than 1,000 days. No well or aquifer formation clogging was observed during injection although treatment was limited to the pore volume displacement radius of the injected reductant. Analysis of posttreatment core samples suggested treatment effectiveness of solid phase , whereas lab tests suggested treatment of the solid phase can be complete provided the chromite ore processing solid waste sediments are sufficiently dosed with the reductant. The sustained treatment of dissolved phase migrating through the treatment zones for more than 1,000 days following injection provided strong evidence of a residual treatment capacity having been imparted to the formation solids. Scanning electron microscopy–energy dispersive x-ray spectroscopy analyses of posttreatment core samples indicated that much of the may be removed through the formation of a Cr-bearing precipitate, possibly a complex carbonate, characterized by an molar ratio of roughly 1:1.
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Acknowledgments
The writers would like to acknowledge the contributions of David Jewett in conducting hydraulic testing at the site; Frank Beck, Patrick Clark, Kyle Jones, and Mark Paddock for assistance in installation and sampling of wells at the site; Shaw Environmental (Ning Xu, Lynda Callaway, Kelley Bates, Ravi Costa, Jarrod Tollett, Brad Scroggins) for analysis of aqueous and solid phase samples, and Daniel Kremser at Battelle for sample characterization via x-ray diffractometry. Additionally, the writers would like to thank Craig Zeller from EPA Region 4 and Tim Nelson from the Macalloy Corporation for their sustained support throughout the course of the study.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 134 • Issue 8 • August 2008
Pages: 651 - 658
Copyright
© 2008 ASCE.
History
Received: Aug 4, 2006
Accepted: Nov 7, 2007
Published online: Aug 1, 2008
Published in print: Aug 2008
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