The effects of a stannous chloride-based water treatment system in a mercury contaminated stream

Mathews, Teresa J.; Looney, Brian B.; Smith, John G.; Miller, Carrie L.; Peterson, Mark J.; Bryan, A. Lawrence; Southworth, George R.

doi:10.1016/j.chemosphere.2015.05.083

The effects of a stannous chloride-based water treatment system in a mercury contaminated stream

Journal Article · Tue Jun 09 00:00:00 EDT 2015 · Chemosphere

DOI:https://doi.org/10.1016/j.chemosphere.2015.05.083· OSTI ID:1185420

Mathews, Teresa J. ^[1]; Looney, Brian B. ^[2]; Smith, John G. ^[1]; Miller, Carrie L. ^[3]; Peterson, Mark J. ^[1]; Bryan, A. Lawrence ^[4]; Southworth, George R. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Troy Univ., Troy, AL (United States)
Savannah River Site (SRS), Aiken, SC (United States). Savannah River Ecology Lab. (SREL)

Remediation of mercury (Hg)-contaminated watersheds is often challenging because of the complex nature of Hg biogeochemistry. Stream ecosystems have been shown to be particularly susceptible to Hg contamination and bioaccumulation in fish. Decreasing total Hg loading to stream systems, however, has shown variable performance in decreasing Hg concentrations in fish tissues. In this study, we assess the impacts of an innovative treatment system in reducing releases of Hg to a small stream system in the southeastern United States. The treatment system, installed in 2007, removes Hg from water using tin (Sn) (II) chloride followed by air stripping. Mercury concentrations in the receiving stream, Tims Branch, decreased from > 100 to ~10 ng/L in the four years following treatment, and Hg body burdens in redfin pickerel (Esox americanus) decreased by 70 % at the most contaminated site. Tin concentrations in water and fish increased significantly in the tributary leading to Tims Branch, but concentrations remain below levels of concern for human health or ecological risks. While other studies have shown that Sn may be environmentally methylated and methyltin can transfer its methyl group to Hg, results from our field studies and sediment incubation experiments suggest that the added Sn to the Tims Branch watershed is not contributing to MeHg production and bioaccumulation. The stannous chloride treatment system installed at Tims Branch was effective at removing Hg inputs and reducing Hg bioaccumulation in the stream with minimal impacts on the environment due to the increased Sn in the system.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Environmental Management (EM)

Grant/Contract Number:: AC05-00OR22725; FC09-96SR18546

OSTI ID:: 1185420

Alternate ID(s):: OSTI ID: 1467498

Journal Information:: Chemosphere, Journal Name: Chemosphere Vol. 138; ISSN 0045-6535

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Pilot-Scale Removal of Total and Hexavalent Chromium From Groundwater Using Stannous Chloride Kennedy, Anthony M.; Korak, Julie A.; Flint, Leah C. Journal - American Water Works Association, Vol. 110, Issue 4 https://doi.org/10.1002/awwa.1048	journal	April 2018
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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stannous chloride
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