Assessing Potential Impacts of Stannous Chloride Based Mercury Treatment on a Receiving Stream Using Real-World Data From Tims Branch, Savannah River Site

Looney, Brian B.; Jackson, D. R.; Peterson, Mark J.; Mathews, Teresa J.; Southworth, G.R.; Paller, Michael H.; Eddy-Dilek, Carol A.; Halverson, N.V.

doi:10.2172/988983

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…The concentrations of tin in the field blank, air stripper inlet, and control site were all below the detection limit. Based on data presented in Looney et al (2010) the high concentration and high particulate fraction measured at the outlet of the M1 air stripper exceed the steady state values and are artifacts of difficult-to-purge particulate tin that has accumulated in the fittings and tubing of the sampling "side-stream". The sample collected at the A014 outfall, where the water enters Tims Branch has a total tin concentration, 21.2 g/L, closely matching the expected steady state value.…”

Section: Geochemical Monitoringmentioning

confidence: 90%

Interim Results From a Study of the Impacts of Tin(ii) Based Mercury Treatment in a Small Stream Ecosystem: Tims Branch, Savannah River Site

Looney¹,

Mathews²

2012

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) collecting fish from a beaver pond using a backpack shocker; typical specimen of redfin pickerel; scanning electron micrograph of flocculated tin oxide particulate collected from treated water exiting the M1 air stripperParticipating Organizations: Savannah River National Laboratory, University of Georgia Savannah River Ecology Laboratory, Oak Ridge National Laboratory, and the Applied Research Center at Florida International University Printed in the United States of America Prepared For U.S. Department of Energy Office of Environmental Management Office of Site Restoration Soil and Groundwater (EM-12) DISCLAIMERThis work was prepared under an agreement with and funded by the U.S. Government. While the authors have taken care in the preparation of this report, neither the U. S. Government or its employees, nor any of its contractors, subcontractors or their employees, makes any express or implied: 1. warranty or assumes any legal liability for the accuracy, completeness, or for the use or results of such use of any information, product, or process disclosed; or 2. representation that such use or results of such use would not infringe privately owned rights; or 3. endorsement or recommendation of any specifically identified commercial product, process, or service. Any views and opinions of authors expressed in this work do not necessarily state or reflect those of the United States Government, or its contractors, or subcontractors. Executive SummaryA research team is assessing the impacts of an innovative mercury treatment system in Tims Branch, a small southeastern stream. The treatment system, installed in 2007, reduces and removes inorganic mercury from water using tin(II) (stannous) chloride addition followed by air stripping. The system results in discharge of inorganic tin to the ecosystem. This screening study is based on historical information combined with measurements of contaminant concentrations in water, fish, sediment, biofilms and invertebrates. Initial mercury data indicate that first few years of mercury treatment resulted in a significant decrease in mercury concentration in an upper trophic level fish, redfin pickerel, at all sampling locations in the impacted reach. For example, the whole body mercury concentration in redfin pickerel collected from the most impacted pond decreased approximately 72% between 2006 (pre-treatment) and 2010 (post-treatment).Over this same period, mercury concentrations in the fillet of redfin pickerel in this pond were estimated to have decreased from approximately 1.45 g/g (wet weight basis) to 0.45 g/g -a decrease from 4.8x to 1.5x the current EPA guideline concentration for mercury in fillet (0.3 g/g). Thermodynamic modeling, scanning electron microscopy, and other sampling data for tin suggest that particulate tin (IV) oxides are a significant geochemical species entering the ecosystem with elevated levels of tin measured in surficial sediments and biofilms. Detectable increases in tin in sediments and biofilms extended approximately 3km from the discha...

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Section: Geochemical Monitoringmentioning

confidence: 90%

Interim Results From a Study of the Impacts of Tin(ii) Based Mercury Treatment in a Small Stream Ecosystem: Tims Branch, Savannah River Site

Looney¹,

Mathews²

2012

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“…Finally, the Fig. 2 Transport of elemental mercury in DNAPL and aqueous transport of oxidized mercury when DNAPL is naturally depleted in oxidizing conditions of aerobic aquifer 60 . Conceptual model explaining why higher than background mercury concentrations are detected in groundwater recovery wells in the M Area of SRS.…”

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confidence: 99%

Dense non-aqueous phase liquid chlorinated contaminant detected far from the source release area in an aquifer

Rossabi¹,

Jackson

Vermeulen

et al. 2022

Commun Earth Environ

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Here we confirm migration of chlorinated solvents tetrachloroethene and trichloroethene, and co-disposed elemental mercury as dense non-aqueous phase liquid in an aquifer at a scale larger than previously documented in the literature, over 650 m from original surface discharge. This finding enhances the conceptual model explaining extensive contaminated plume persistence by adding structurally controlled dense non-aqueous phase liquid to known mechanisms such as source dissolution and matrix back-diffusion. Following injections of oxidants at a depth greater than 50 m, which effectively destroyed dissolved chlorinated contaminants during a groundwater remediation pilot test in South Carolina, we measured excess chloride higher than attributable to pre-test dissolved concentrations of chlorinated contaminants, and oxidative releases of mercury, which is an opportunistic tracer of non-aqueous phase solvent transport when in its elemental form. The results suggest potentially targeted destruction strategies in disconnected non-aqueous phase liquid accumulation areas may reduce remediation timeframe and support cleanup of sites previously considered technically impracticable.

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“…water data for mercury in surface waters and rainfall near Savannah River Site (figure fromLooney et al 2010) ........................................................................ 11Figure 4-2 Summary of Mercury Mass Balance at Savannah River Site................................................... 12 Figure 4-3 2012 Total Mercury in Rainfall Results from the National Atmospheric Deposition Program (NADP) ................................................................................................................................................ 13…”

mentioning

confidence: 99%

Update to agency for toxic substances and disease registry 2012 report on assessment of biota exposure to mercury originating from Savannah River Site.

Kuhne¹

2015

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Assessing Potential Impacts of Stannous Chloride Based Mercury Treatment on a Receiving Stream Using Real-World Data From Tims Branch, Savannah River Site

Cited by 4 publications

References 18 publications

Interim Results From a Study of the Impacts of Tin(ii) Based Mercury Treatment in a Small Stream Ecosystem: Tims Branch, Savannah River Site

Interim Results From a Study of the Impacts of Tin(ii) Based Mercury Treatment in a Small Stream Ecosystem: Tims Branch, Savannah River Site

Dense non-aqueous phase liquid chlorinated contaminant detected far from the source release area in an aquifer

Update to agency for toxic substances and disease registry 2012 report on assessment of biota exposure to mercury originating from Savannah River Site.

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