Passive Biobarrier for Treating Co-mingled Perchlorate and RDX in Groundwater at an Active Range
Technical Report,01 May 2010,01 Nov 2015
CB and I Environmental, Inc. Lawrenceville United States
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A subsurface biobarrier consisting of emulsified vegetable oil and a buffering agent was tested to enhance biodegradation and reduce the migration of co-mingled RDX, HMX. and perchlorate in a shallow, acidic groundwater aquifer at an operational m.ilita1yrai1ge in Dahlgren, Va. Despite heterogeneous subsurface lithology mid low hydraulic conductivity in the test site aquifer, RDX, HMX, and perchlorate were reduced by 92 in a centerline of monitoring wells extending 40 ft downgradient of the biobarrier when adequate total organic carbon TOC was present from the added oil. The accumulation of toxic nitroso-degradation products MNX, DNX, and TNX from RDX was minimal. Moreover, the passive biobarrier resulted in no significant impacts to ongoing range activities. This field trial suggests that an emulsified oil biobarrier is a viable alternative to reduce the migration of co-mingled perchlorate and explosives in groundwater at this and similar ranges. Ideal range locations include open OBOD areas, target areas, fast cookoff sites, EOD training areas, and other locations where high munition constituent concentrations are possible.