Where is accelerated in situ bioremediation of CT cost effective?
• Plumes or portions of plumes small enough for volumetric treatment (maximum diameters in the range of 100 meters). • Aquifers where plumes exhibit non-equilibrium contaminant partitioning (i.e., caused by preferential flow paths, layering, sorption in soil particles/micropores). • High concentration (but below toxicity limit) portions of plumes with significant contaminant sorption. Life Cycle Cost Results for the Duration of Treatment at the Hanford Site Present Value a ($M) Treatment System R= 1.0 R = 1.3 R = 1.7 Scenario 1 (100 g/L contour) Bioremediation NA b NA b NA b Pump-and-Treat 9.4 9.9 10.0 Scenario 2 (1000 g/L contour) Bioremediation 8.8 9.4 9.9 Pump-and-Treat 6.5 6.8 7.0 Pump-and-Treat (half as many wells) 3.3 3.5 3.7 a For various values of the CT retardation factor, R b NA = not applicable, the treatment did not reach the performance goal For more information, contact: Michael Truex Program Manager Field Hydrology and Chemistry Group Battelle 902 Battelle Blvd., K6-96 R
