CLU-IN Home

U.S. EPA Contaminated Site Cleanup Information (CLU-IN)


U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

Search Result

CASE STUDY: USE OF ZERO VALENT IRON (ZVI) TO ENHANCE ABIOTIC/BIOTIC CHLORINATED SOLVENT REMEDIATION AT A FORMER WASTEWATER TREATMENT FACILITY
Kinsella, K. and T. Justham.
2017 New Hampshire Hazardous Waste & Contaminated Sites Conference, May 24, Manchester, NH. 31 slides, 2017

Chlorinated VOCs, mainly TCE and daughter products, were found beneath a former municipal wastewater treatment facility in New England. TCE was detected at concentrations >1,000 mg/L, with measurable DNAPL in a groundwater monitoring well. Following a bench-scale study, regulators approved a field-scale abiotic/biotic pilot study within the upper hydrogeologic unit's saturated alluvial deposits. A blend of zero-valent iron (ZVI), guar gum, sugar, inactive yeast, and micronutrients was injected in a 300 ft2 area using direct push methods. The abiotic/biotic remedy created multiple degradation pathways, addressing both residual CVOC source mass and dissolved-phase CVOCs by combining ZVI-based chemical dechlorination with microbial dehalorespiration. Site groundwater contained sulfate at background concentrations ranging up to 50 mg/L. Pilot results showed that the combined biotic/abiotic dechlorination remedy was effective on a complex source area and illuminated the pH balance maintained during bioremediation and the potential of sulfate to enhance ZVI effects. http://www.biaofnh.com/uploads/5/9/9/2/59921097/session_a__2_.pdf



The Technology Innovation News Survey welcomes your comments and suggestions, as well as information about errors for correction. Please contact Michael Adam of the U.S. EPA Office of Superfund Remediation and Technology Innovation at adam.michael@epa.gov or (703) 603-9915 with any comments, suggestions, or corrections.

Mention of non-EPA documents, presentations, or papers does not constitute a U.S. EPA endorsement of their contents, only an acknowledgment that they exist and may be relevant to the Technology Innovation News Survey audience.