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SUCCESSFUL BIOREMEDIATION OF 1,4-DIOXANE AND 1,2-DICHLOROETHANE IN A DILUTE PLUME
Chu, M.-Y.J., P. Bennett, and M. Einarson.
2017 GRA Conference, October 3-4, 2017, Sacramento, California. 21 slides, 2017

The feasibility of concurrent treatment of all contaminants via the aerobic cometabolic biodegradation (ACB) process was demonstrated in California at the former McClellan Air Force Base. Primary substrates HD10 propane and oxygen were added to recirculated groundwater to stimulate in situ aerobic cometabolic activity of the indigenous microbial population. Results show that dioxane can be treated to concentrations < 1 µg/L and co-contaminants TCE, 1,2-DCA, and 1,1-DCE can be concurrently treated to their respective analytical method detection limits of 0.23, 0.18, and 0.2 µg/L. The degrading activity lasted for more than two weeks without the addition of primary substrates. Treatment efficiencies were contaminant specific, ranging from 90-99%. This presentation shares insights gained from the demonstration field test along with descriptions of in situ ACB implementation under various large dilute plume scenarios. Potential applications, including different suites of contaminants, various types of substrates, enhanced natural attenuation, and mass flux management, are also identified. https://www.grac.org/files/1161/download/



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