Determining the long-term operational performance of pump and treat and the possibility of closure for a large TCE plume

Guo, Zhenxing; Brusseau, Mark L.; Fogg, Graham E.

doi:10.1016/j.jhazmat.2018.11.057

Cited by 46 publications

(17 citation statements)

References 34 publications

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“…2013; Seyedabbasi et al 2013; Guo et al 2019). Several publications have indicated that PAT in settings with back diffusion may require timeframes on the order of one or more centuries for restoration (LaBolle and Fogg 2001; Lemming et al 2012; McDade et al 2013; Guo et al 2019). For example, LaBolle and Fogg (2001) simulated PAT remediation using the alluvial aquifer characteristics found at the Lawrence Livermore National Laboratory Superfund Site in Livermore, California.…”

Section: Literature Reviewmentioning

confidence: 99%

Strategies for Managing Risk due to Back Diffusion

Brooks¹,

Yarney²,

Huang³

2021

Groundwater Monitoring Rem

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Back diffusion of contaminants from secondary sources may hamper site remediation if it is not properly addressed in the remedial design. A review of all reported technologies and strategies that have been or could be applied to address plume persistence due to back diffusion as published in the peer‐reviewed literature is provided. We classify these into four major categories. The first category consists of those approaches that do not include active measures to specifically address contamination in the low permeable zones (LPZs) and can therefore be considered passive LPZ management approaches. A disadvantage of these approaches is the long duration that may be required to meet acceptable endpoints; however, this allows degradation to potentially play a significant part even at modest rates. The remaining three categories all use approaches to specifically address contaminants in the LPZ. The second category consists of strategies that promote contaminant destruction through the forward diffusion of amendments into the LPZ. A variety of laboratory tests indicate concentration or flux reductions range from no improvement, to reductions as high as four orders‐of‐magnitude depending on the evaluation metric. The third category consists of strategies that alter physical characteristics of the secondary source, and includes viscosity modification, fracturing, and soil mixing. Each of these offer unique advantages and are often used to deliver one or more amendments for contaminant treatment. The final category consists of thermal and electrokinetic remediation, both less susceptible to permeability contrast limitations. However, they are not routinely used for secondary‐source treatment.

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Section: Literature Reviewmentioning

confidence: 99%

Strategies for Managing Risk due to Back Diffusion

Brooks¹,

Yarney²,

Huang³

2021

Groundwater Monitoring Rem

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“…Non-aqueous phase liquids (NAPLs), such as petroleum hydrocarbons and chlorinated solvents, are among the most widespread (and consequential) soil and groundwater contaminants, and they are increasingly being recognized as serious environmental problems [1][2][3]. These water-immiscible organic liquids are classified into light NAPL (LNAPL) and dense NAPL (DNAPL) based on their densities [4].…”

Section: Introductionmentioning

confidence: 99%

Synthetic and Natural Surfactants for Potential Application in Mobilization of Organic Contaminants: Characterization and Batch Study

Amanat

Barbati

Rossi

et al. 2022

Water

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In this paper, we investigated the abilities of five sugar-based synthetic surfactants and biosurfactants from three different families (i.e., alkyl polyglycoside (APG), sophorolipid (SL), and rhamnolipid (RL)) to dissolve and mobilize non-aqueous phase liquid (NAPL) components, i.e., toluene and perchloroethylene (PCE), adsorbed on porous matrices. The objective of this study was to establish a benchmark for the selection of suitable surfactants for the flushing aquifer remediation technique. The study involved a physicochemical characterization of the surfactants to determine the critical micelle concentration (CMCs) and interfacial properties. Subsequently, a batch study, through the construction of adsorption isotherms, made it possible to evaluate the surfactants’ capacities in contaminant mobilization via the reduction of their adsorptions onto a reference adsorbent material, a pine wood biochar (PWB). The results indicate that a synthetic surfactant from the APG family with a long fatty acid chain and a di-rhamnolipid biosurfactant with a shorter hydrophobic group offered the highest efficiency values; they reduced water surface tension by up to 54.7% and 52%, respectively. These two surfactants had very low critical micelle concentrations (CMCs), 0.0071 wt% and 0.0173 wt%, respectively; this is critical from an economical point of view. The batch experiments showed that these two surfactants, at concentrations just five times their CMCs, were able to reduce the adsorption of toluene on PWB by up to 74% and 65%, and of PCE with APG and RL by up to 65% and 86%, respectively. In general, these results clearly suggest the possibility of using these two surfactants in surfactant-enhanced aquifer remediation technology.

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“…When combined with particle tracking software (Pollock, 2012), models can provide estimates of subsurface travel time and flow path depth, parameters that can be highly influential to discharge temperature and chemistry (Briggs et al, 2018; Winter et al, 1998). Although at small spatial scales (10 0 –10 2 km 2 ) simulated groundwater discharge and flow path characteristics have been examined (e.g., Carniato et al, 2015; Guo et al, 2019; Kaandorp et al, 2018; Mo et al, 2017), many studies in mid‐ to large‐sized watersheds (>10 2 km 2 ) do not examine these patterns (e.g., Feinstein et al, 2010; Masterson et al, 2016; Parsen et al, 2016; Reeve et al, 2001; Sanford et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Improved Prediction of Management‐Relevant Groundwater Discharge Characteristics Throughout River Networks

Barclay

Starn

Briggs

et al. 2020

Water Resources Research

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Groundwater discharge zones connect aquifers to surface water, generating baseflow and serving as ecosystem control points across aquatic ecosystems. The influence of groundwater discharge on surface flow connectivity, fate and transport of contaminants and nutrients, and thermal habitat depends strongly on hydrologic characteristics such as the spatial distribution, age, and depth of source groundwater flow paths. Groundwater models have the potential to predict spatial discharge characteristics within river networks, but models are often not evaluated against these critical characteristics and model equifinality with respect to discharge processes is a known challenge. We quantify discharge characteristics across a suite of groundwater models with commonly used frameworks and calibration data. We developed a base model (MODFLOW-NWT) for a 1,570-km 2 watershed in the northeastern United States and varied the calibration data, control of river-aquifer exchange directionality, and resolution. Most models (n = 11 of 12) fit similarly to calibration metrics, but patterns in discharge location, flow path depth, and subsurface travel time varied substantially. We found (1) a 15% difference in the percent of discharge going to first-order streams, (2) threefold variations in flow path depth, and (3) sevenfold variations in the subsurface travel times among the models. We recalibrated three models using a synthetic discharge location data set. Calibration with discharge location data reduced differences in simulated discharge characteristics, suggesting an approach to improved equifinality based on widespread field-based mapping of discharge zones. Our work quantifying variation across common modeling approaches is an important step toward characterizing and improving predictions of groundwater discharge characteristics.

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Determining the long-term operational performance of pump and treat and the possibility of closure for a large TCE plume

Cited by 46 publications

References 34 publications

Strategies for Managing Risk due to Back Diffusion

Strategies for Managing Risk due to Back Diffusion

Synthetic and Natural Surfactants for Potential Application in Mobilization of Organic Contaminants: Characterization and Batch Study

Improved Prediction of Management‐Relevant Groundwater Discharge Characteristics Throughout River Networks

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