In Situ Thermal Remediation of DNAPL Source Zones

Johnson, Richard L.; Tratnyek, Paul G.; Sleep, Brent E.; Król, Marianna

doi:10.21236/ada579910

Cited by 4 publications

(6 citation statements)

References 81 publications

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“…In past decades, various remediation technologies have been developed, involving individual units or combined physical, chemical and biological processes, such as air sparging [2], thermal treatment [3], enhanced-solubilization flushing [4], in situ bioremediation, and permeable reactive barriers (PRB) [5]. While each technology has met with success for certain applications, each of them has specific limitations.…”

Section: Introductionmentioning

confidence: 99%

Enhancement effects of chelating agents on the degradation of tetrachloroethene in Fe(III) catalyzed percarbonate system

Miao¹,

et al. 2015

Chemical Engineering Journal

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The performance of Fe(III)-based catalyzed sodium percarbonate (SPC) for stimulating the oxidation of tetrachloroethene (PCE) for groundwater remediation applications was investigated. The chelating agents citric acid monohydrate (CIT), oxalic acid (OA), and Glutamic acid (Glu) significantly enhanced the degradation of PCE. Conversely, ethylenediaminetetraacetic acid (EDTA) had a negative impact on PCE degradation, which may due to its strong Fe chelation and HO• scavenging abilities. However, excessive SPC or chelating agent will retard PCE degradation. In addition, investigations using free radical probe compounds and radical scavengers revealed that PCE was primarily degraded by HO• radical oxidation in both the chelated and non-chelated systems, while O2•− also participated in the non-chelated system and the OA and Glu modified systems. According to the electron paramagnetic resonance (EPR) studies, the presence of HO• in the Fe(III)/SPC system was maintained much longer than that in the Fe(II)/SPC system. The results indicated that the addition of CIT, OA or Glu indeed enhanced the generation of HO• in the first 10 min and promoted degradation efficiency by increasing the amount of Fe(III) and maintaining the concentration of HO• radicals in solution. In conclusion, chelated Fe(III)-based catalyzed SPC oxidation is a promising method for the remediation of PCE-contaminated groundwater.

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Section: Introductionmentioning

confidence: 99%

Enhancement effects of chelating agents on the degradation of tetrachloroethene in Fe(III) catalyzed percarbonate system

Miao¹,

et al. 2015

Chemical Engineering Journal

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“…The total oxidant demand test was developed as a diagnostic tool to generally measure the mass of oxidant needed to significantly reduce background soil oxidant demand, improve contaminant oxidation, and to quantify how much oxidant is needed for ISCO design purposes. 35,36 Others have reported that repeated persulfate treatments did not improve the rate of contaminant oxidation in some soils and minerals. 33 One possible explanation for these seemingly opposing results may lie in the role of radical scavenging.…”

Section: Environmental Implicationsmentioning

confidence: 99%

“…Radical scavenging involves the reaction between radicals and nontarget chemical species; and NPR involves reactions that do not yield radicals and consequently deplete the source of oxidants, such as persulfate (S 2 O 8 2− ) (PS) or hydrogen peroxide (H 2 O 2 ), which in turn diminishes radical production. PS reaction with natural media involves NPR [1][2][3][4][5] and contributes to treatment inefficiency. Radical scavengers may either be soluble in the aqueous phase or may be present as a solid phase.…”

Section: Introductionmentioning

confidence: 99%

“…The origin of NPRs involving PS has been attributed to the amorphous iron content or soil organic matter in the aquifer material. [1][2][3] Other NPRs with PS include acidcatalyzed (pH < 3) PS decomposition or uncatalyzed PS decomposition to hydrogen sulfate and oxygen. 23 However, these reactions occur at relatively slow rates (>80 days) 1 and are not applicable to the short-term reaction conditions used in this study.…”

Section: Introductionmentioning

confidence: 99%

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Sulfate Radical Scavenging by Mineral Surfaces in Persulfate-Driven Oxidation Systems: Reaction Rate Constants and Implications

Crincoli

Green

Huling

2020

Environ. Sci. Technol.

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Activated persulfate (PS) is a common method used to generate sulfate radicals (SO 4•− ), a powerful oxidant capable of degrading a broad array of environmental contaminants. The reaction of SO 4•− with nontarget species (i.e., scavenging) contributes significantly to treatment inefficiency. Radical scavenging in this manner has been quantified for nontarget chemical species in the aqueous phase but has never been quantified for solid phase media. Kinetic analysis and laboratory methods were developed to quantify the SO 4 •− scavenging rate constant (k ≡S ) for alumina, a naturally occurring mineral in soil and aquifer materials. SO 4 •− generated in UV and thermally activated persulfate (UV-APS, T-APS) batch systems, and the loss of rhodamine B (RhB) served as an indicator of SO 4 •− activity. k ≡s for alumina was 2.42 × 10 4 and 2.03 × 10 4 m −2 s −1 for UV-APS and T-APS oxidative treatment systems, respectively. At [alumina] >5 g L −1 , the reaction of SO 4 •− with solid phase media increased over the aqueous phase reactions with RhB and aqueous scavengers. SO 4 •− scavenging by solid surfaces was orders of magnitude greater than the reaction with the target compound and scavengers in the aqueous phase, underscoring the significant role of solid surfaces in scavenging SO 4 •− .

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“…Small-scale experiments in Oregon [JOHNSON, 2007] showed a marked reduction in liquidphase permeability at low temperatures of approx. 50°C as a result of the appearance of gas bubbles by ebullition (degassing).…”

Section: Phases Of Operationmentioning

confidence: 99%

Large-Scale Physical Models of Thermal Remediation of DNAPL Source Zones in Aquitards

Baker¹,

Hiester²

2009

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Prescribed by ANSI Std Z39-18 This report was prepared under contract to the Department of Defense Strategic Environmental Research and Development Program (SERDP). The publication of this report does not indicate endorsement by the Department of Defense, nor should the contents be construed as reflecting the official policy or position of the Department of Defense. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the Department of Defense.

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In Situ Thermal Remediation of DNAPL Source Zones

Cited by 4 publications

References 81 publications

Enhancement effects of chelating agents on the degradation of tetrachloroethene in Fe(III) catalyzed percarbonate system

Enhancement effects of chelating agents on the degradation of tetrachloroethene in Fe(III) catalyzed percarbonate system

Sulfate Radical Scavenging by Mineral Surfaces in Persulfate-Driven Oxidation Systems: Reaction Rate Constants and Implications

Large-Scale Physical Models of Thermal Remediation of DNAPL Source Zones in Aquitards

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