David B. Gent
U.S. Army Corps of Engineers, Engineer Research and Development Center
David Gent is a research engineer with the Engineer Research Development Center, Environmental Laboratory, Vicksburg, MS part of the Army Corps of Engineers. He received his Doctorate in Civil and Environmental Engineering from Northeastern University, Boston, MA.
He has over 20 years experience with treatment of chlorinates solvents, munitions constituents, and heavy metal contamination in soils, groundwater, and industrial wastewater. He is an expert in electrochemical and electrokinetics (EK) remediation.
PLATFORM PRESENTER - It's All About Amendment Delivery: Are We There Yet?
Electrokinetically Enhanced Deliver of Amendments In-Situ Remediation of Fine-Grain Silty Soils
Electrokinetically (EK) enhanced amendment delivery technology involves the use of electrodes and direct current (DC) electrical power to establish an electric field in the subsurface. EK is an innovative technology that has been shown to deliver select amendments, such as electron donors (e.g. lactate) and chemical oxidants (e.g. permanganate and persulfate) into the pore spaces of low permeability soils. The major mechanisms for EK transport of amendment include ion migration and electroosmosis. Electromigration (or ion migration) is the movement of charged dissolved ions through an aqueous medium in response to an applied electric field. Electroosmosis is the movement of pore fluid (and dissolved constituents) within a porous medium induced by an applied electric field. Laboratory and field-scale amendments delivery by electrokinetics for enhanced in-situ bioremediation and chemical oxidation are transported at rates of 1.5 to 5 cm/day in low permeability soils. Field scale electrokinetics amendment delivery results are proven similar to those from laboratory testing.