Topic Area: 9c. Remediation and Management of Petroleum Hydrocarbon-Contaminated Sites

Formatted Title:

Plume Wide Anaerobic Bioremediation Pilot Test for In-Situ Remediation of Petroleum Hydrocarbons

Background/Objectives:

Laboratory treatability and field pilot testing was performed to evaluate the in-situ treatment of petroleum hydrocarbons plume by applying enhanced microbial sulfate reduction at the Baird & McGuire Superfund Site (Site) in Holbrook, Massachusetts. A sulfate injection pilot test is being conducted to stimulate the anaerobic biodegradation of hydrocarbons in groundwater and soil (Parsons NAPL-Away^® process). The pilot test is being conducted in an area with residual light non-aqueous phase liquid (LNAPL) up to 40 feet thick in saturated sands and is targeting the entire plume.

Approach/Activities:

Prior to sulfate injection a 9-month pump and treat system shutdown test evaluated the migration of contaminants under natural flow conditions in the absence of added sulfate. A downgradient well was installed to supply a source of anaerobic groundwater for the sulfate pilot test with 4 upgradient injection wells, used to create a recirculation system. Minimizing dissolved oxygen in the injection water avoided the potential for iron oxidation and fouling of above ground equipment and injection wells. The sulfate injection pilot test included the continuous injection of anaerobic supply water supplemented with sulfate and sodium fluorescein tracer into four injection wells located at the upgradient edge of the residual LNAPL area.

Dorothy Allen

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(Group 1, Poster Board #26) Plume Wide Anaerobic Bioremediation Pilot Test for In-Situ Remediation of Petroleum Hydrocarbons