Predicting the Performance of Activated Carbon-, Coke-, and Soil-Amended Thin Layer Sediment Caps
Publication: Journal of Environmental Engineering
Volume 132, Issue 7
Abstract
In situ capping manages contaminated sediment on-site without creating additional exposure pathways associated with dredging, e.g., sediment resuspension, and potential human exposure during transport, treatment, or disposal of dredged material. Contaminant mass is not immediately removed in sediment capping, which creates concerns over its long-term effectiveness. Groundwater seepage can also decrease the effectiveness of in situ capping. This study compares the effectiveness of commercially available sorbents that can be used to amend sand caps to improve their ability to prevent contaminant migration from the sediments into the bioactive zone. Amendments evaluated include coke, activated carbon, and organic-rich soil. The properties relevant to advective-dispersive transport through porous media (sorption, porosity, dispersivity, and bulk density) are measured for each material, and then used as inputs to a numerical model to predict the flux of 2,4,5-polychlorinated biphenyl (PCB) through a sand cap amended with a thin sorbent layer. Systems with and without groundwater seepage are considered. Isolation times provided by the sorbent layers increased with increasing sorption strength and capacity (activated ). The effective porosity, dispersivity, and bulk density of the sorbent layer had little effect on cap performance compared to sorption strength . In the absence of seepage, all sorbents could isolate PCBs in the underlying sediment for times greater than and would be effective for most cap applications. With groundwater seepage (Darcy ), activated carbon was the only sorbent that provided contaminant isolation times greater than . Long isolation times afforded by sorbent-amended caps allow time for inherently slow natural attenuation processes to further mitigate PCB flux.
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Acknowledgments
This work was funded by the Hazardous Substance Research Center-SSW (R139634), the Cooperative Institute for Coastal and Estuarine Environmental Technology (CICEET), and by Alcoa, Inc. (Pittsburgh, Pa.). The authors also thank the reviewers for their insightful comments that significantly improved the quality of this manuscript.
References
Abramowicz, D. A., Brennan, M. J., Van Dort, H. M., and Gallagher, E. L. (1993). “Factors influencing the rate of polychlorinated biphenyl dechlorination in Hudson River sediments.” Environ. Sci. Technol., 27(6), 1125–1131.
Accardi-Dey, A., and Gschwend, P. M. (2002). “Assessing the combined roles of natural organic matter and black carbon as sorbents in sediments.” Environ. Sci. Technol., 36(1), 21–29.
Brown, J. F. Jr., et al. (1987). “Polychlorinated biphenyl dechlorination in aquatic sediments.” Science, 236(4802), 709–712.
Carmo, A. M., Hundal, L. S., and Thompson, M. L. (2000). “Sorption of hydrophobic organic compounds by soil materials: Application of unit equivalent Freundlich coefficients.” Environ. Sci. Technol., 34(20), 4363–4369.
Culver, T. B., Brown, R. A., and Smith, J. A. (2000). “Rate-limited sorption and desorption of 1,2-dichlorobenzene to a natural sand soil column.” Environ. Sci. Technol., 34(12), 2446–2452.
Fennel, D. E., Nijenhuis, I., Wilson, S. F., Zinder, S. H., and Haggblom, M. M. (2004). “Dehalococcoides ethenogenes strain 195 reductively dechlorinates diverse chlorinated aromatic pollutants.” Environ. Sci. Technol., 38(7), 2075–2081.
Fetter, C. W. (1999). Contaminant hydrogeology, 2nd Ed., Prentice-Hall, Englewood Cliffs, N.J., 1999.
Ghosh, U., Zimmerman, J. R., and Luthy, R. G. (2003). “PCB and PAH speciation among particle types in contaminated harbor sediments and effects on PAH bioavailability.” Environ. Sci. Technol., 37(10), 2209–2217.
Grathwohl, P. (1990). “Influence of organic matter from soils and sediments from various origins on the sorption of some chlorinated aliphatic hydrocarbons: Implications on Koc correlations.” Environ. Sci. Technol., 24(11), 1687–1693.
Jonker, M. T. O., and Koelmans, A. A. (2002). “Sorption of polycyclic aromatic hydrocarbons and polychlorinated biphenyls to soot and sootlike materials in the aqueous environment: Mechanistic considerations.” Environ. Sci. Technol., 36(17), 3725–3734.
Ju, D., and Young, T. M. (2004). “Effects of competitor and natural organic matter characteristics on the equilibrium sorption of 1,2-dichlorobenzene in soil and shale.” Environ. Sci. Technol., 38(22), 5863–5870.
Karickhoff, S. W., Brown, D. S., and Scott, T. A. (1979). “Sorption of hydrophobic pollutants on natural sediments.” Water Res., 13, 241–248.
Kleineidam, S., Schuth, C., and Grathwohl, P. (2002). “Solubility-normalized combined adsorption-partitioning sorption isotherms for organic pollutants.” Environ. Sci. Technol., 36(21), 4689–4697.
Lowry, G. V., and Johnson, K. M. (2004). “Congener specific dechlorination of dissolved PCBs by microscale and nanoscale zerovalent iron in a water/methanol solution.” Environ. Sci. Technol., 38(19), 5208–5216.
Luthy, R. G. et al. (1997). “Sequestration of hydrophobic organic contaminants by geosorbents.” Environ. Sci. Technol., 31(12), 3341–3347.
Marquette, A. (2005). “Modeling of chemical fate and transport in the environment.” MS thesis, Dept. of Chemical Engineering, Louisiana State Univ., Baton Rouge, La.
Matrix Environmental and Geotechnical Services. (2003). “Quantifying specific discharge across the sediment-water interface within a test area of the Anacostia River, Washington, D.C.—A precapping evaluation.” Rep. to Hazardous Substance Research Center, South and Southwest, Louisiana State Univ., Baton Rouge, La. ⟨http://www.hsrc-ssw.org/anareports.html⟩.
McAuliffe, C. D. (1971). “GC determination of solutes by multiple phase equilibration.” Chem. Technol., 1, 46–51.
McLeod, P., Vandenheuvel, M., Allen-King, R., Luoma, S., and Luthy, R. (2004). “Effects of particulate carbonaceous matter on the bioavailability of benzo[a]pyrene and 2, , 5, -tetrachlorobiphenyl to the clam, Macoma balthica.” Environ. Sci. Technol., 38(17), 4549–4556.
Middelburg, J. J., Soetaert, K., and Herman, P. M. J. (1997). “Empirical relationships for use in global diagenetic models.” Deep-Sea Res., Part I, 44(2), 327–344.
National Research Council (NRC). (2001). A risk-management strategy for PCB-contaminated sediments, National Academies Press, Washington, D.C.
Palermo, M., Maynord, S., Miller, J., and Reible, D. (1998). “Guidance for in situ subaqueous capping of contaminated sediments.” EPA 905-B96-004, Great Lakes National Program Office, Chicago.
Palermo, M. R., Homziak, J., and Teeter, A. M. (1990). “Evaluation of clamshell dredging and barge overflow, military ocean terminal, Sunny Point, NC.” Tech. Rep. No. D-90-6, U.S. Army Engineer Waterways Experiment Station, Vicksburgh, Miss.
Pirbazari, M., Badriyha, B., Kim, S., and Miltner, R. (1992). “Evaluating GAC adsorbers for the removal of PBCs and toxaphene.” J. Am. Water Works Assoc., 84(2), 83–90.
Quensen III, J. F., Boyd, S. A., and Tiedje, J. M. (1990). “Dechlorination of four commercial polychlorinated biphenyl mixtures (Arochlors) by anaerobic micro-organisms from sediments.” Appl. Environ. Microbiol., 56(8), 2360–2369.
Reible, D. D., Kiehl-Simpson, C., and Marquette, A. (2004). “Modeling chemical fate and transport in sediment caps.” Technical Presentation 380-D, American Institute of Chemical Engineers, N.Y.
Reible, D. D. et al. (2003). “Comparison of the long-term risks of removal and in-situ management of contaminated sediments in the Fox River.” J. Soil Contaminat, 12(3), 325–344.
Rhee, G.-Y. et al. (2001). “Kinetics of polychlorinated biphenyl dechlorination and growth of dechlorinating microorganisms.” Envir. Toxicol. Chem., 20(4), 721–726.
Schwarzenbach, R. P., Gschwend, P. M., and Imboden, D. M. (2003). Environmental organic chemistry, 2nd Ed., Wiley, N.Y.
Talley, J. W., Ghosh, U., Tucker, S. G., Furey, J. S., and Luthy, R. G. (2002). “Particle-scale understanding of the bioavailability of PAHs in sediment.” Environ. Sci. Technol., 36(3), 477–483.
Thibodeaux, L. J. (1996). Environmental chemodynamics, 2nd Ed., Wiley-Interscience, N.Y.
Thoma, G. J., Reible, D. D., Valsaraj, K. T., and Thibodeaux, L. J. (1993). “Efficiency of capping contaminated sediments in situ. II: Mathematics of diffusion-adsorption in the capping layer.” Environ. Sci. Technol., 27(12), 2412–2419.
U.S. Environmental Protection Agency. (1998). “EPA’s monitored natural attenuation policy.” The Army Lawyer, 308, 85 ⟨http://www.epa.gov/OUST/directiv/d9200417.pdf⟩.
U.S. Environmental Protection Agency (USEPA) (2002). “EPA superfund record of decision-Hudson River PCBs.” ROD ID: EPA/541/R-02/013, Washington, D.C. ⟨http://www.epa.gov/superfund/sites/rods/fulltext/r0202013.pdf⟩.
U.S. Environmental Protection Agency and Wisconsin Department of Natural Resources. (2003). “Record of decision operable units 3, 4, and 5 Lower Fox River and Green Bay, Wisconsin.” CERCLIS ID: WID000195481 ⟨http://www.dnr.state.wi.us/org/water/wm/lowerfox/rifs/whitepapers/ROD%20for%20OU%203-5%20final.pdf⟩.
van Genuchten, M. T., and Alves, W. J. (1982). “Analytical solutions of the one-dimensional convective-dispersive solute transport equation.” USDA ARS Tech. Bull. No. 1661, U.S. Salinity Laboratory, Riverside, Calif.
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Received: Mar 29, 2005
Accepted: Oct 12, 2005
Published online: Jul 1, 2006
Published in print: Jul 2006
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