Recent Trends in the Selection of Remedies for Groundwater, Soil, and Sediment at Superfund Sites

Fiedler, Linda; Pachon, Carlos

doi:10.1111/gwmr.12260

Cited by 4 publications

(4 citation statements)

References 1 publication

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“…Enhanced in situ bioremediation (EISB) of chlorinated solvents, including the widespread groundwater contaminants tetrachloroethene (PCE) and trichloroethene (TCE), is an effective remedy implemented at numerous sites. − Chlorinated solvents, however, rarely occur in isolation and co-contaminants can negatively impact bioremediation. − Per- and polyfluoroalkyl substances (PFAS) are a class of emerging contaminants that are constituents of a variety of products, including firefighting aqueous film-forming foams (AFFFs). − AFFFs have been used to extinguish fires fed by waste fuels and solvents, leading to corelease of PCE, TCE, and PFAS to soil and groundwater. , Groundwater plumes associated with AFFF use have documented source area total PFAS concentrations as high as 7.09 mg/L. − …”

Section: Introductionmentioning

confidence: 99%

Microbial Reductive Dechlorination by a Commercially Available Dechlorinating Consortium Is Not Inhibited by Perfluoroalkyl Acids (PFAAs) at Field-Relevant Concentrations

Hnatko¹,

Liu

Elsey

et al. 2023

Environ. Sci. Technol.

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Perfluoroalkyl acids (PFAAs) have been shown to inhibit biodegradation (i.e., organohalide respiration) of chlorinated ethenes. The potential negative impacts of PFAAs on microbial species performing organohalide respiration, particularly Dehalococcoides mccartyi (Dhc), and the efficacy of in situ bioremediation are a critical concern for comingled PFAA-chlorinated ethene plumes. Batch reactor (no soil) and microcosm (with soil) experiments, containing a PFAA mixture and bioaugmented with KB-1, were completed to assess the impact of PFAAs on chlorinated ethene organohalide respiration. In batch reactors, PFAAs delayed complete biodegradation of cis-1,2-dichloroethene (cis-DCE) to ethene. Maximum substrate utilization rates (a metric for quantifying biodegradation rates) were fit to batch reactor experiments using a numerical model that accounted for chlorinated ethene losses to septa. Fitted values for cis-DCE and vinyl chloride biodegradation were significantly lower (p < 0.05) in batch reactors containing ≥50 mg/L PFAAs. Examination of reductive dehalogenase genes implicated in ethene formation revealed a PFAA-associated change in the Dhc community from cells harboring the vcrA gene to those harboring the bvcA gene. Organohalide respiration of chlorinated ethenes was not impaired in microcosm experiments with PFAA concentrations of 38.7 mg/L and less, suggesting that a microbial community containing multiple strains of Dhc is unlikely to be inhibited by PFAAs at lower, environmentally relevant concentrations.

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Section: Introductionmentioning

confidence: 99%

Microbial Reductive Dechlorination by a Commercially Available Dechlorinating Consortium Is Not Inhibited by Perfluoroalkyl Acids (PFAAs) at Field-Relevant Concentrations

Hnatko¹,

Liu

Elsey

et al. 2023

Environ. Sci. Technol.

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“…P&T has been the most widely used option for the remediation of contaminated sites since the 1980s [20]. However, it suffers from several shortcomings and disadvantages, which have been extensively addressed in the literature [20,25,[27][28][29][30][31][32][33]. P&T has very high operational costs that must be incurred for several years, often decades [20,[34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

A Quantitative Approach to Assessing the Technical and Economic Performance of Source Containment Options for Contaminated Aquifers

et al. 2021

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The containment of contaminant plumes to protect groundwater from pollution is recognized as a frequent need in brownfield redevelopment. Plume containment can be physical, with slurry walls, jet grouting etc., or hydraulic, with wells capturing the subsurface flow that crosses the contaminated front (Pump & Treat), or a combination of both types. The choice of the most suitable technique is a difficult task, since various aspects must be taken into consideration. In this paper, we present a framework for evaluating barriers in terms of effectiveness and efficiency, along with a simplified approach for the evaluation of capital and operational costs. The contaminant mass discharge escaping from the containment system is a robust indicator of its effectiveness, and can be derived from modelling results. The abstracted water flowrate is a key indicator of the efficiency and sustainability of each option, especially in the long term. The methodology is tested in a simplified case study and in a real one, highlighting the relevance of modelling results in guiding the choice and design of contaminant source containment systems.

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“…Despite the increasing use of in situ remediation techniques [4], many P&T systems are still installed and operating all over the world, either as the only remediation intervention implemented at a contaminated site, or for plume control in association with other technologies. According to Pobodnik and Horst [5], an estimate of P&T systems operating in USA in 1997 was 45,508 treating plants on 217,176 contaminated sites (around 21% of the total).…”

Section: Introductionmentioning

confidence: 99%

How Can We Make Pump and Treat Systems More Energetically Sustainable?

Casasso

Tosco

Bianco

et al. 2019

Water

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Pump and treat (P&T) systems are still widely employed for the hydraulic containment of contaminated groundwater despite the fact that their usage is decreasing due to their high operational costs. A way to partially mitigate such costs, both in monetary and environmental terms, is to perform heat exchange (directly or with a heat pump) on the groundwater extracted by these systems, thus providing low-carbon and low-cost heating and/or cooling to buildings or industrial processes. This opportunity should be carefully evaluated in view of preserving (or even improving) the removal efficiency of the remediation process. Therefore, the heat exchange should be placed upstream or downstream of all treatments, or in an intermediate position, depending on the effect of water temperature change on the removal efficiency of each treatment step. This article provides an overview of such effects and is meant to serve as a starting reference for a case-by-case evaluation. Finally, the potentiality of geothermal use of P&T systems is assessed in the Italian contaminated Sites of National Interest (SIN), i.e., the 41 priority contaminated sites in Italy. At least 29 of these sites use pumping wells as hydraulic barriers or P&T systems. The total discharge rate treated by these plants exceeds 7000 m3/h and can potentially provide about 33 MW of heating and/or cooling power.

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Recent Trends in the Selection of Remedies for Groundwater, Soil, and Sediment at Superfund Sites

Cited by 4 publications

References 1 publication

Microbial Reductive Dechlorination by a Commercially Available Dechlorinating Consortium Is Not Inhibited by Perfluoroalkyl Acids (PFAAs) at Field-Relevant Concentrations

Microbial Reductive Dechlorination by a Commercially Available Dechlorinating Consortium Is Not Inhibited by Perfluoroalkyl Acids (PFAAs) at Field-Relevant Concentrations

A Quantitative Approach to Assessing the Technical and Economic Performance of Source Containment Options for Contaminated Aquifers

How Can We Make Pump and Treat Systems More Energetically Sustainable?

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