Field Demonstration of DNAPL Dehalogenation Using Emulsified Zero-Valent Iron

Numerical prediction of diffusion and electric field-induced iron nanoparticle transport, Electrochimica Acta http://dx.doi.org/10.1016/j.electacta. 2014.11.157 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…Results from field scale applications [23][24][25][26][27] confirm this limited mobility, ranging from 1 m…”

Section: Introductionmentioning

confidence: 68%

Numerical prediction of diffusion and electric field-induced iron nanoparticle transport

Gomes

Rodríguez‐Maroto

Ribeiro

et al. 2015

Electrochimica Acta

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“…Their high density and size prevent the particles from being suspended in water and they cannot be injected without some form of facilitated transport. Research on improved injection strategies for iron particles has been conducted using emulsified oil (Quinn et al 2005), hydrofracturing of the aquifer (Schnell and Mack 2003), use of carrier particles (Schrick et al 2004), and co-injection of iron with polymers (Cantrell et al 1997a,b;. Shear-thinning polymers have been demonstrated to improve transport characteristics of micron-scale ZVI and show considerable promise for emplacing ZVI within the subsurface.…”

Section: Zvi Technologymentioning

confidence: 99%

Combining Low-Energy Electrical Resistance Heating with Biotic and Abiotic Reactions for Treatment of Chlorinated Solvent DNAPL Source Area

Macbeth¹,

Truex²,

Powell³

et al. 2012

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REPORT DOCUMENTATION PAGEForm Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information , 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. (From -To) The effectiveness and timeframe of in situ remedies such as in situ bioremediation (ISB) and zero-valent iron (ZVI) is a function of mass transfer when applied in chlorinated solvent dense nonaqueous phase liquid (DNAPL) source zones. The ESTCP ER-0719 project demonstrated combining low-temperature subsurface heating with in situ remedies to enhance remediation performance through both increased degradation reaction rates and contaminant dissolution. (TCE). Capture and treatment of contaminated vapor-a major cost element of standard thermal treatment-was not needed as treatment maintained low aqueous TCE concentrations. Additional infrastructure needed for heating was limited to subsurface electrodes and a power control unit. These results suggest that combined heating and in situ treatment may be cost effective in source zones with moderate contaminant mass or when combined with hightemperature thermal. REPORT DATE (DD-MM-YYYY) 12-05-2012 REPORT TYPE ESTCP Final Report DATES COVEREDAs expected, reductive dechlorination occurred with ISB and a mixture of reductive dechlorination and reductive elimination occurred with ZVI. Increased reaction and contaminant dissolution were observed in both tests with increased temperature, but volatilization was minimal during the test because in situ reactions maintained low aqueous phase TCE concentrations.For the ISB test, increasing the temperatures (10 o C to between 35 and 45 o C) accelerated overall contaminant dechlorination by a factor of 2-4 at hotspot locations close to residual contaminant mass. An average of 430 kW-h per day of electrical power was applied to raise the test zone temperature to 40 o C within 30 days over a volume of 271 m 3 , after which, 25-140 kW-h per day was sufficient to sustain the temperature depending on infiltration rates.Field test results demonstrated that moderate heating and minor operational costs enhanced efficiency and effectiveness of in situ treatment of TCE. Capture and treatment of contaminated vapor-a major cost element of standard thermal treatment-was not needed as treatment maintained low aqueous TCE concentrations....

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“…Emulsified oil substrates have been tested in the laboratories and applied in the field for the remediation of dense NAPL (DNAPL) contaminants (Harkness and Fisher, 2013;Lee et al, 2007), dissolved chlorinated contaminants (Borden, 2007b;Hunter, 2002;Long and Borden, 2006), and heavy metals or radionuclides (Gihring et al, 2011;Lindow, 2004;Lookman et al, 2013;Tang et al, 2013). Emulsified oil has also been used for reactive particle delivery for subsurface remediation (Berge and Ramsburg, 2009;Huff, 2011;Quinn et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Delivery of vegetable oil suspensions in a shear thinning fluid for enhanced bioremediation

Zhong

Truex

Kananizadeh

et al. 2015

Journal of Contaminant Hydrology

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In situ anaerobic biological processes are widely applied for dechlorination of chlorinated solvents in groundwater. A wide range of organic substrates have been tested and applied to support the dechlorination processes. Vegetable oils are a promising type of substrate and have been shown to induce effective dechlorination, have limited geochemical impacts, and maintain good longevity. Because they are non-aqueous phase liquids, distribution of vegetable oils in the subsurface has typically been approached by creating emulsified oil solutions for injection into the aquifer. In this study, inexpensive waste vegetable oils were suspended in a shear-thinning xanthan gum solution as an alternative approach for delivery of vegetable oil to the subsurface. The stability, oil droplet size distribution, and rheological behavior of the oil suspensions that are created in the xanthan solutions were studied in batch experiments. The injectability of the suspensions and the oil distribution in a porous medium were evaluated in column tests. Numerical modeling of oil droplet transport and distribution in porous media was conducted to help interpret the columntest data. Batch studies showed that simple mixing of vegetable oil with xanthan solution produced stable suspensions of the oil as micron-size droplets. The mixture rheology retains shear-thinning properties that facilitate improved uniformity of substrate distribution in heterogeneous aquifers. Column tests demonstrated successful injection of the vegetable oil suspension into a porous medium. This study provides evidence that vegetable oil suspensions in xanthan gum solutions have favorable injection properties and are a potential substrate for in situ anaerobic bioremediation.Published by Elsevier B.V.

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Field Demonstration of DNAPL Dehalogenation Using Emulsified Zero-Valent Iron

Cited by 376 publications

References 5 publications

Numerical prediction of diffusion and electric field-induced iron nanoparticle transport

Numerical prediction of diffusion and electric field-induced iron nanoparticle transport

Combining Low-Energy Electrical Resistance Heating with Biotic and Abiotic Reactions for Treatment of Chlorinated Solvent DNAPL Source Area

Delivery of vegetable oil suspensions in a shear thinning fluid for enhanced bioremediation

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