Treatment of Chlorinated Hydrocarbon Contaminated Groundwater with Injectable Nanoscale Bimetallic Particles

摘要

ARCADIS conducted a laboratory research project for the Environmental Security Technology Certification Program (ESTCP) that evaluated the reductive dechlorination of trichloroethene (TCE) by multiple types of nanoscale zero valent iron (nZVI) particles obtained from multiple manufacturers. The manufacturing methods used to produce the nZVI particles utilized during this research result in particles that fall into two structural categories that ARCADIS defined during this research including particles with amorphous atomic structures and those with crystalline atomic structures. ARCADIS has shown that structural differences in iron particles can lead to profoundly different properties during the utilization of the nZVI for reductive dechlorination of TCE. Different phases of the laboratory program focused on the, reactivity, longevity, injectability and potential for treatment of dense, nonaqueous phase liquid (DNAPL) for multiple manufactured types of nZVI with both amorphous and crystalline structures. Over the multiyear laboratory research program, several of the multiple venders of nZVI contributing materials were engaged in product development/improvement efforts leading to nZVI with enhanced performance characteristics. Due to the relatively high cost of nZVI as a consumable remediation reagent, this laboratory program was aimed at investigating the factors that combine to influent return on investment including rate of reactivity, longevity under aquifer conditions, and potential to effectively treat DNAPL.