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Long-term monitoring and modeling of the mass transfer of polychlorinated biphenyls in sediment following pilot-scale in-situ amendment with activated carbon

Lookup NU author(s): Professor David Werner, Professor Richard Luthy

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Abstract

The results of five years of post-treatment monitoring following in-situ activated carbon (AC) placement for stabilization of polychlorinated biphenyls (PCBs) at an inter-tidal mudflat adjacent to Hunters Point Shipyard, San Francisco Bay, CA, USA are reported in this paper. After five years, AC levels of the sediment cores were comparable to those at earlier sampling times. Passive sampler uptake validated the benefit of the AC amendment with a strong local sorbent dose-response relationship. The PCB uptakes in passive samplers decreased up to 73% with a 3.7 dry wt.% AC dose after five years, confirming the temporal enhancement of the amendment benefit from a 19% reduction with a 4.4% dose observed within one month. The long-term effectiveness of AC, the local AC dose response, the impact of fouling by NOM, the spatial heterogeneity of AC incorporation, and the effects of advective sediment pore-water movement are discussed with the aid of a PCB mass transfer model. Modeling and experimental results indicated that the homogeneous incorporation of AC in the sediment will significantly accelerate the benefit of the treatment. (C) 2011 Elsevier B.V. All rights reserved.


Publication metadata

Author(s): Cho YM, Werner D, Choi YJ, Luthy RG

Publication type: Article

Publication status: Published

Journal: Journal of Contaminant Hydrology

Year: 2012

Volume: 129

Pages: 25-37

Print publication date: 06/10/2011

ISSN (print): 0169-7722

ISSN (electronic): 1873-6009

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.jconhyd.2011.09.009

DOI: 10.1016/j.jconhyd.2011.09.009


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