Batch leaching testing of stabilized dredged bottom-sea sediments
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SEDIMENTS, SEC 5 • SEDIMENT MANAGEMENT • RESEARCH ARTICLE
Batch leaching testing of stabilized dredged bottom-sea sediments Atul Singh 1 & Margaret Houlihan 2 & Asli Y. Dayioglu 3 & Ahmet H. Aydilek 4 Received: 22 October 2019 / Accepted: 22 April 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose This study aims to define the long-term leaching of metals from structural fills composed of quarry byproduct-amended marine-dredged material under the influence of pH and to study the geochemical behavior of the species likely to form. Methods Compaction and shear tests, image analysis, and pHstat and toxicity characteristic leaching procedure tests were undertaken to study the metal leaching behavior of raw dredged sediments and their blends prepared with three different quarry fines. Geochemical analysis was conducted to determine the predominant oxidation states from the analyzed metals, the aqueous concentrations of metal species, and the dominant leaching control mechanisms in the leachates. Results The quarry fine-amended dredged sediments satisfied the local compaction specifications for highway embankment construction while the raw sediments did not. The effective friction angle of the blends was also higher than that of raw sediments due to differences in soil structure and shape parameters. Leaching of As during the pHstat leaching tests followed an amphoteric pattern for raw sediments and a cationic pattern for the blends. Al, Cu, Fe, Ni, and Zn concentrations leached from the blends were below the EPA water quality limits at near-neutral pH. Conclusions The concentrations of all metals released during the batch leach tests from the treated dredged materials are below the water quality limits under varying pH conditions. Geochemical modeling results indicated that release of all elements except arsenic from the treated dredged sediments was controlled by the dissolution and precipitation of oxide, hydroxide, and carbonate solids containing the elements. Keywords Dredged sediment . Geochemical modeling . Metal leaching . Shear . Water quality
1 Introduction Approximately 3.5 million cubic meters of marine sediments must be dredged annually from the federal navigation channels serving the Port of Baltimore in order to maintain their authorized depths and widths and to ensure reliable navigation. One of the leading options for the innovative reuse of dredged material (DM) is to incorporate the DM (raw, treated, Responsible editor: Victor Magar * Ahmet H. Aydilek [email protected] 1
AECOM, Germantown, MD, USA
2
Department of Civil and Environmental Engineering, Stanford University, Palo Alto, CA, USA
3
Department of Civil Engineering, Istanbul Technical University, Istanbul, Turkey
4
Department of Civil and Environmental Engineering, University of Maryland, 1163 Glenn Martin Hall, College Park, MD 20742, USA
and/or otherwise amended) in earthwork construction, including as a highway embankment and/or structural fill material, depending on its geotechnical characteristics an
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