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U.S. EPA Contaminated Site Cleanup Information (CLU-IN) CLU-IN | Strategies & Initiatives | Green Remediation Focus | Profiles of Green Remediation | Altus Air Force Base Altus Air Force Base
Altus, OK
Federal Facility, RCRA Corrective Action

Click on images
below for details Bioreactor Cross Section: The bioreactor serves a dual purpose: (1) degrading TCE and other chlorinated aliphatic hydrocarbons in the ground water and (2) generating leachate with high dissolved oxygen content, for ultimate re-injection into the aquifer. Bioreactor Cross Section Beneficial Use of Storm Waste: Reactive media in the biowall and bioreactor partially consists of organic matter from storm-damaged trees collected and mulched by the city of Altus. Beneficial Use of Storm Waste Solar-Powered Pumping: The pumping system uses four 50-watt, fixed-position PV panels to generate electricity for powering a small submersible pump that recirculates TCE-contaminated ground water through the bioreactor. During each minute of peak sunlight hours, the pump returns 2-3 gallons of groundwater from an extraction trench to the bioreactor for treatment. The original solar pump (Grundfos 11SQF-2) cost approximately $2,300 when purchased in 2003. Solar-Powered Pumping Flow Rates in Bioreactor: Periodic measurement of groundwater flow through the bioreactor is used to identify potential system problems such as the need to replace a worn recirculation pump or repair a leaky air release valve. Flow Rates in Bioreactor Biowall Configuration: The majority of the biowalls are positioned along the facility's southern boundary, where spills of various equipment maintenance products occurred in the past. Biowall Configuration Continuous One-Pass Trenching: Use of a continuous one-pass trenching machine for biowall construction allowed excavation and filling to occur in one step rather than the two-step process needed when single-purpose equipment is used. This approach avoided concern about temporarily open trenches while reducing associated diesel fuel consumption, disturbance to ground surfaces and adjacent vegetation, and duration of construction activities. Continuous One-Pass Trenching Injection Trailer and Equipment: Biowall groundwater extraction, substrate mixing, and injection of the soybean oil emulsion was conducted as one continuous operation between June and October 2008. Small tanks of the soybean oil, which was delivered to the site in 21 bulk loads, were positioned near the injection trailer. Injection Trailer and Equipment

Cleanup Objectives: Reduce groundwater concentrations of chlorinated aliphatic hydrocarbons near a closed landfill and in several plumes resulting from past chemical spills and other sources at this active 3,550-acre military installation. Implemented remedies include enhanced anaerobic bioremediation involving an in situ bioreactor supported by a well circulation system to treat source areas and several in situ biowalls to treat groundwater plumes.

Green Remediation Strategy: Reduce the environmental footprint of cleanup activities by employing best management practices that involve:


Property End Use: Continued military operations

Point of Contact: Mary C. Bitney (U.S. Air Force Civil Engineer Center)

Update: July 2015

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