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Long-term Performance Evaluation of Groundwater Chlorinated Solvents Remediation Using Nanoscale Emulsified Zerovalent Iron at a Superfund Site
Citation:
Su, C., R. Puls, T. Krug, M. Watling, S. O'Hara, J. Quinn, AND N. Ruiz. Long-term Performance Evaluation of Groundwater Chlorinated Solvents Remediation Using Nanoscale Emulsified Zerovalent Iron at a Superfund Site. Applying Nanotechnology for Environmental Sustainability. Center for Global Environmental Technologies, The University of New Mexico, Albuquerque, NM, , 92-111, (2017). https://doi.org/10.4018/978-1-5225-0585-3.ch005
Impact/Purpose:
It is important to develop and verify methods for groundwater remediation on a long-term basis. This study provides novel information about the long-term effect of EZVI injection on contaminant degradation and removal. It shows that a single injection of EZVI can sustain active dechlorination for at least four years
Description:
An update is provided for a six-year performance evaluation of using emulsified zerovalent iron (EZVI) to treat tetrachloroethene (PCE) at a Superfund site at Parris Island, South Carolina, USA. The field test consisted of two side-by-side treatment plots to remedy a shallow PCE source zone using pneumatic injection and direct injection, separately. Significant decreases in PCE and trichloroethene (TCE) concentrations were observed in downgradient wells with corresponding increases in degradation products including significant increases in ethene. In the pneumatic injection plot, there were significant reductions in the downgradient groundwater mass flux values for chlorinated ethenes (>58%) and a significant increase in the mass flux of ethene (628%). There were significant reductions in total CVOC mass (78%); an estimated reduction of 23% in the sorbed and dissolved phases and 95% reduction in the PCE DNAPL mass. Significant increases in dissolved sulfide, volatile fatty acids (VFA), and total organic carbon (TOC) were observed and dissolved sulfate and pH decreased in many wells. The apparent effective destruction of CVOC was accomplished by a combination of abiotic dechlorination by nanoiron and biological reductive dechlorination stimulated by the oil in the emulsion. The dechlorination reactions were sustained for the six-year period from a single EZVI delivery.
URLs/Downloads:
DOI: Long-term Performance Evaluation of Groundwater Chlorinated Solvents Remediation Using Nanoscale Emulsified Zerovalent Iron at a Superfund Site