Accession Number : ADA512821


Title :   Field Testing of Activated Carbon Mixing and In Situ Stabilization of PCBs in Sediment


Descriptive Note : Final rept. Dec 2005-Dec 2008


Corporate Author : STANFORD UNIV CA DEPT OF CIVIL AND ENVIRONMENTAL ENGINEERING


Personal Author(s) : Luthy, Richard G ; Cho, Yeo-Myoung ; Ghosh, Upal ; Bridges, Todd S ; Kennedy, Alan J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a512821.pdf


Report Date : May 2009


Pagination or Media Count : 288


Abstract : We conducted the first field-scale test of in-situ activated carbon (AC) amendment for contaminated sediment remediation. Using commercial equipment devices, AC was successfully incorporated into the test plots to a nominal 1 foot depth at a dose of 2-3 %. In-situ bioassays with Macoma nasuta showed the benefit of AC treatment, though at 18 months post-treatment the insitu assay results were confounded due to newly deposited sediment. Ex-situ M.nasuta bioassays showed about 50 % reduction in PCB biouptake with 2 % of AC dose. Field-exposed AC retained a strong stabilization capability to reduce aqueous equilibrium PCB concentrations by as much as 95 %, which supports the long-term effectiveness of AC in the field at least up to 18 months. Neither PCB resuspension from the test plots nor adverse impacts to the benthic community were observed. Scaling-up the AC treatment method results in possible total cost savings of 70 to 75 % less than sediment dredging and disposal for the Hunters Point South Basin test site. If ongoing contaminant sources are eliminated and freshly deposited sediments are clean, in-situ AC amendment of contaminated sediments can provide a suitable method for reducing contaminant exposure to the water column and biota.


Descriptors :   *SAN FRANCISCO BAY , *BIOASSAY , *OCEAN ENVIRONMENTS , *WATER POLLUTION ABATEMENT , *SEDIMENTS , *POLYCHLORINATED BIPHENYLS , *ACTIVATED CARBON , LONG RANGE(TIME) , DEPOSITION , WATER POLLUTION , DOSAGE , COMMERCIAL EQUIPMENT , CONTAMINANTS , MIXING , CONTAMINATION , DISPOSAL , AQUATIC ORGANISMS , SAVINGS , DREDGING , PLOTTING , ASSAYING , EQUILIBRIUM(GENERAL) , ALTERNATING CURRENT , FIELD TESTS , WATER , EXPOSURE(GENERAL) , SOURCES , TEST AND EVALUATION , STABILIZATION


Subject Categories : Ecology
      Organic Chemistry
      Solid Wastes Pollution and Control
      Water Pollution and Control


Distribution Statement : APPROVED FOR PUBLIC RELEASE