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Sowers, K.R., U. Ghosh, and H.D. May.
ESTCP Project ER-201215, 154 pp, 2018

The project objective was to demonstrate and validate a recently developed in situ treatment for degrading PCBs in contaminated sediments under field conditions. The innovative aspect of the technology is the application of activated carbon pellets as a solid substrate for: 1) delivery of microorganisms into sediments and 2) sequestration and concentration of hydrophobic PCBs in close proximity to the PCB-transforming bacteria. Both anaerobic halorespiring and aerobic PCB-degrading bioamendments were mass cultured, transported to a site, and delivered through a water column to sediments without loss of viability. Treatment with the bioamendment mixture reduced the mean total PCB concentration by an average of 52% and the aqueous PCB fraction by 95% after 13.5 months. Costs of the treatment were less than thick caps and dredging, and the approach is suited to treat ecologically sensitive and difficult to reach areas. https://www.serdp-estcp.org/content/download/48048/457538/file/ER-201215%20Final%20Report.pdf

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