Enhanced Anaerobic Bioremediation of a TCE Source Area at the Tarheel Army Missile Plant using EOS®

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Courtesy of EOS Remediation, LLC

Emulsified oil substrate (EOS®) is being used to remediate a trichloroethene (TCE) source area at the Tarheel Army Missile Plant (TAMP) in Burlington, North Carolina.

1. INTRODUCTION
Emulsified oil substrate (EOS®) is being used to remediate a trichloroethene (TCE) source area at the Tarheel Army Missile Plant (TAMP) in Burlington, North Carolina. TAMP is a government-owned, formerly contractor-operated 33-acre facility with a 50-year history of use for production of defense-related and private sector electronics. Releases from manufacturing operations and underground storage tanks (USTs) have impacted soils and groundwater at TAMP with petroleum hydrocarbons and chlorinated volatile organic compounds (CVOCs). Ten years of active remediation, including pump-and-treat, in situ soil vacuum extraction, and air sparging (SVE/AS), have been effective in reducing the BTEX. However, these efforts have had little effect on the dissolved phase TCE groundwater plume.

In preparation for transfer of ownership of the property, the Army elected to evaluate bioremediation alternatives for the TCE in groundwater. Solutions-IES, Inc. conducted a pilotscale study to test the ability of EOS® to reduce the CVOCs in groundwater. The pilot test was designed to treat a 100-ft by 100-ft zone believed to be the primary source area for the TCE plume.

EOS® is an effective, low cost substrate for enhancing anaerobic bioremediation of a variety of contaminants including chlorinated solvents, perchlorate, nitrate, chromate, acid mine drainage, and explosives. EOS® consists of food-grade soybean oil, surfactants, macro and micronutrients, and vitamins blended to form a stable micro-emulsion with small, uniformly-sized oil droplets. Once injected into the subsurface, the oil droplets stick to the sediment surfaces providing a residual oil phase. The oil provides a slow-release carbon source for cell growth and electron donor for energy generation, supporting long-term anaerobic biodegradation of the target contaminants. This approach provides good contact between the slowly biodegradable organic substrate (oil) and the contaminants.

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