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FULL-SCALE APPLICATION OF ACTIVATED CARBON TO REDUCE POLLUTANT BIOAVAILABILITY IN A 5-ACRE LAKE
Patmont, E., M. Jalalizadeh, M. Bokare, T. Needham, J. Vance, R. Greene, J. Cargill, et al.
Journal of Environmental Engineering Vol. 146 No 5 [Published online Feb 2020 prior to print]
In November 2013, a 2-week full-scale remediation project was conducted that directly placed ~36 tons of SediMite™ activated carbon (AC) into sediments on Mirror Lake in Dover, Delaware. The remedy aimed to enhance the sorption capacity of native sediments to reduce the exposure of bioaccumulative pollutants, including PCBs, contributing to fish consumption advisories. Post-treatment sampling indicated an average AC concentration of 4.3% by dry weight in surface sediments. Primary monitoring was performed pre- and 1 and 3 years post-remediation. Sediment porewater and surface water measurement using passive samplers showed reductions of 60%-80% of total freely dissolved PCBs. Fish tissue analysis of resident fish samples collected before and 3-5 years after treatment showed reductions of ~70% on a lipid-normalized basis and agree with modeled predictions. In contrast, two migratory species caught in the lake showed limited changes in PCB concentrations, likely reflecting greater regional exposure while these fish migrated beyond the lake. More information: http://www.sestcp.com/case_studies08.html
Journal of Environmental Engineering Vol. 146 No 5 [Published online Feb 2020 prior to print]
In November 2013, a 2-week full-scale remediation project was conducted that directly placed ~36 tons of SediMite™ activated carbon (AC) into sediments on Mirror Lake in Dover, Delaware. The remedy aimed to enhance the sorption capacity of native sediments to reduce the exposure of bioaccumulative pollutants, including PCBs, contributing to fish consumption advisories. Post-treatment sampling indicated an average AC concentration of 4.3% by dry weight in surface sediments. Primary monitoring was performed pre- and 1 and 3 years post-remediation. Sediment porewater and surface water measurement using passive samplers showed reductions of 60%-80% of total freely dissolved PCBs. Fish tissue analysis of resident fish samples collected before and 3-5 years after treatment showed reductions of ~70% on a lipid-normalized basis and agree with modeled predictions. In contrast, two migratory species caught in the lake showed limited changes in PCB concentrations, likely reflecting greater regional exposure while these fish migrated beyond the lake. More information: http://www.sestcp.com/case_studies08.html
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