Abstract
A novel approach to emplacing chemically reactive barriers is the injection of zero-valent iron (Fe{sup 0}) colloids into the subsurface. A difficulty encountered in this approach is that the dense Fe{sup 0} colloids settle out of solution with time, decreasing the distance the colloids can be injected into the subsurface. Studies were conducted to evaluate if several viscous shear-thinning fluids could enhance Fe{sup 0} colloid emplacement in porous media. Aqueous solutions of three nontoxic polymers at different concentrations were investigated: a synthetic high molecular weight polymer [vinyl polymer, (VP)], a biopolymer (gum xanthan, GX), and a cellulose-type polymer (carboxymethyl cellulose, CMC). The use of shear-thinning fluids greatly increases the mobility of the colloidal Fe{sup 0} suspensions in porous media. VP was superior to GX and GMC because the VP suspensions produced the lowest back pressures, resulting in the highest hydraulic conductivities.
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