Michalsen, M., F. Crocker, K. Indest, C. Jung, M. Fuller, P. Hatzinger, and J. Istok.
ESTCP Project ER-201207, 264 pp, 2016

RDX is mobile and persistent in aerobic groundwater and typically forms large, dilute plumes that are difficult and costly to remediate using conventional technologies, such as pump and treat or anaerobic biostimulation. This project demonstrated an innovative application of bioaugmentation to enhance RDX biodegradation in contaminated groundwater under aerobic conditions at the Umatilla Chemical Depot (UMCD) in Umatilla, Oregon. The principal demonstration objectives were to (1) select and optimize RDX-degrading microbial cultures for use in aerobic bioaugmentation at the site; (2) compare in situ RDX biodegradation rates for aerobic bioaugmentation to those for biostimulation; and (3) quantify and compare costs of RDX remediation. This report summarizes the demonstration activities and results. https://www.estcp.com/content/download/40565/388566/file/ER-201207%20Final%20Report.pdf See also the ESTCP Cost and Performance Report at https://www.estcp.com/content/download/40452/387643/file/ER-201207%20C&P%20Report.pdf.