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LOW-IMPACT IN-SITU PILOT USING SIMPLE ADDITIVE DELIVERY LEADS TO FULL-SCALE BIOSTIMULATION STRATEGY FOR DESTRUCTION OF RESIDUAL CVOCS
Armstrong, K.C. and G. Bell.
RemTech 2017: Remediation Technologies Symposium. Presentation 41, 30 slides, 2017

To address PCE contamination at the site of a former dry cleaner where biological treatment was considered unlikely to succeed, ERDenhanced™-filled Passive Release Sock (PRS) deployment units were evaluated in a pilot study to determine the capacity of the treatment to stimulate the native dehalorespiring populations and realize enhanced reductive dechlorination. ERDenhanced is a carbon-carbohydrate formulation of a proprietary macro-micro nutrient blend. Each PRS unit (2 units per deployment) was suspended within the saturated screened interval of a 2-inch monitoring well, with about 2 lbs of additive in each sock and replacement at 8-wk intervals. Four deployment events were conducted during the 26-wk evaluation. Groundwater monitoring, sampling, and analytical testing were performed for each event. Performance data confirmed that the additive stimulated enhanced reductive dechlorination by native dehalorespiring bacteria in the treatment zone. The significant reductions in contaminant concentrations achieved by the pilot led the regulators to approve a full-scale remediation strategy in July 2013 that combined source removal and biostimulation using ERDenhanced to address dissolved-phase and residual CVOCs at the site.
Longer abstract: http://www.esaa.org/wp-content/uploads/2017/09/RemTech2017Abstracts-41.pdf
Slides: http://www.esaa.org/wp-content/uploads/2017/10/17-Armstrong.pdf



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