American Society of Civil Engineers


Transport of Lactate-Modified Nanoscale Iron Particles in Sand Columns


by Amid P. Khodadoust, (Associate Professor, Department of Civil & Materials Engineering, University of Illinois at Chicago, 842 W. Taylor Street, Chicago, IL 60607 E-mail: akhodado@uic.edu), Krishna R. Reddy, (Professor, Department of Civil & Materials Engineering, University of Illinois at Chicago, 842 W. Taylor Street, Chicago, IL 60607 E-mail: kreddy@uic.edu), and Srinivasa Varadhan, (Graduate, Research Assisatnt, Department of Civil & Materials Engineering, University of Illinois at Chicago, 842 W. Taylor Street, Chicago, IL 60607)
Section: Advances in Remediation Technologies, pp. 478-486, (doi:  http://dx.doi.org/10.1061/40970(309)60)

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Document type: Conference Proceeding Paper
Part of: GeoCongress 2008: Geotechnics of Waste Management and Remediation
Abstract: Nanoscale iron particles have great potential for in-situ remediation of subsurface soils. The transport of reactive nanoscale iron particles (RNIPs) into the contaminated subsurface is essential for the success of this remediation technology. RNIP cannot be transported through porous media effectively without surface modification. In this study, the transport of RNIP modified with lactate was investigated in 1-D sand column experiments under pressurized conditions using a natural sandy soil and an electrolyte solution. Sodium lactate and aluminum lactate were considered as lactate species for modification of RNIP. Aluminum lactate was mixed with bare RNIP at concentrations of 2, 4, 6, 8, 10 and 12%, and introduced at the top of the sand column. The elution of RNIP from the sand column increased with increasing concentration of aluminum lactate up to 10% using a constant air pressure of 30 psig. Elution of RNIP slug through the sand column ranged from 55% for bare RNIP to 90% for RNIP modified with 10% aluminum lactate using an RNIP dosage of 4.8 g/L. Using a constant aluminum lactate concentration of 10%, the elution of RNIP through the sand column decreased with increasing dosage of RNIP, ranging from 90% for 4.8 g/L to 65% for 12 g/L. Using a dosage of 4.8 g/L of RNIP, 10% sodium lactate performed worse than 10% aluminum lactate, resulting in an elution value of 80% versus 90%, respectively.


ASCE Subject Headings:
Columns
Iron compounds
Nanotechnology
Particles
Sand (material)