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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



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