Closing the mass balance at chlorinated solvent sites: Sources and attenuation processes

Kamath, Roopa; Looney, Brian B.; Newell, Charles J.; Adamson, David T.; Vangelas, Karen M.

doi:10.1002/rem.20240

Cited by 4 publications

(6 citation statements)

References 13 publications

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“…The Biobalance Toolkit is designed as a user-friendly Excel spreadsheet, incorporating a series of analytical solutions and routines implemented through Visual Basic code. It facilitates the calculation of electron donor and acceptor mass balances in chlorinated solvent plumes emanating from the source [381]. For more detailed information on this model, refer to the article by Kamath et al [382].…”

Section: Biobalance Tool Kitmentioning

confidence: 99%

A Critical Review of the Modelling Tools for the Reactive Transport of Organic Contaminants

Samborska-Goik,

Pogrzeba

2024

Applied Sciences

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The pollution of groundwater and soil by hydrocarbons is a significant and growing global problem. Efforts to mitigate and minimise pollution risks are often based on modelling. Modelling-based solutions for prediction and control play a critical role in preserving dwindling water resources and facilitating remediation. The objectives of this article are to: (i) to provide a concise overview of the mechanisms that influence the migration of hydrocarbons in groundwater and to improve the understanding of the processes that affect contamination levels, (ii) to compile the most commonly used models to simulate the migration and fate of hydrocarbons in the subsurface; and (iii) to evaluate these solutions in terms of their functionality, limitations, and requirements. The aim of this article is to enable potential users to make an informed decision regarding the modelling approaches (deterministic, stochastic, and hybrid) and to match their expectations with the characteristics of the models. The review of 11 1D screening models, 18 deterministic models, 7 stochastic tools, and machine learning experiments aimed at modelling hydrocarbon migration in the subsurface should provide a solid basis for understanding the capabilities of each method and their potential applications.

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Section: Biobalance Tool Kitmentioning

confidence: 99%

A Critical Review of the Modelling Tools for the Reactive Transport of Organic Contaminants

Samborska-Goik,

Pogrzeba

2024

Applied Sciences

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“…For the attenuation of DNAPL due to ED injection, an electron balance approach is used assuming that the quantity of ED species relative to electron acceptor (EA) species limits the biodecay of chlorinated hydrocarbon (CH) (Kamath et al 2006) and a superposition method is used such that CH concentration decreases linearly as the amount of effective ED involved in the biodecay increases. If redox reactions take place serially in the order of decreasing reaction free energy (e.g., O 2 > NO 3 > SO 4 > Fe(III) > CH), then an electron balance provides where is the aqueous CH concentration with serial reactions [M/L 3 ], C CH is the CH concentration computed without any reactions in , is the background H‐equivalent ED concentration in the aquifer [M/L 3 ], is the background H‐equivalent concentration of all EA species in the aquifer [M/L 3 ], is the ratio of H‐equivalent to actual CH concentration [–], is the ratio of H‐equivalent to actual injected ED concentration [–].…”

Section: Description Of Modeling and Optimization Approachmentioning

confidence: 99%

Cost Optimization of DNAPL Remediation at Dover Air Force Base Site

Lee¹,

Liu²,

Kitanidis³

et al. 2012

Groundwater Monitoring Rem

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This study investigates stochastic optimization of dense nonaqueous phase liquid (DNAPL) remediation design at Dover Air Force Base Area 5 using emulsified vegetable oil (EVO) injection. The Stochastic Cost Optimization Toolkit (SCOToolkit) is used for the study, which couples semianalytical DNAPL source depletion and transport models with parameter estimation, error propagation, and stochastic optimization modules that can consider multiple sources and remediation strategies. Model parameters are calibrated to field data conditions on prior estimates of parameters and their uncertainty. Monte Carlo simulations are then performed to identify optimal remediation decisions that minimize the expected net present value (NPV) cleanup cost while maintaining concentrations at compliance wells under the maximum contaminant level (MCL). The results show that annual operating costs could be reduced by approximately 50% by implementing the identified optimal remediation strategy. We also show that recalibration and reoptimization after 50 years using additional monitoring data could lead to a further 60% reduction in annual operating cost increases the reliability of the proposed remediation actions.

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“…More extensive flow and transport models can be used to predict potential plume lengths, but the cost may be prohibitive for many smaller plumes. Recently, mass-balance approaches have been proposed to evaluate the balance between source input and attenuation processes (Kamath et al, 2010;Looney et al, 2006). Spatial mass-flux calculations over time are recommended to demonstrate declining source strength supportive of stable to shrinking plumes (Farhat et al, 2006;Truex et al, 2007;WSDOE, 2005).…”

Section: Common Approaches To Evaluating Plume Stabilitymentioning

confidence: 99%

“…Spatial mass-flux calculations over time are recommended to demonstrate declining source strength supportive of stable to shrinking plumes (Farhat et al, 2006;Truex et al, 2007;WSDOE, 2005). The BioBalance software (Kamath et al, 2010) and Mass Flux Toolkit (Farhat et al, 2006) have been designed to simplify these types of analyses. Mass-discharge approaches are consistent with a definition of plume stability where "the perimeter of the plume attains sufficient size .…”

Section: Common Approaches To Evaluating Plume Stabilitymentioning

confidence: 99%

“…Simple qualitative graphical methods, such as illustrating the change in ratios of parent and daughter compounds over time, can provide powerful evidence of mass attenuation. Software tools such as Natural Attenuation Software (NAS; Chapelle et al, 2003) and BioBalance (Kamath et al, 2010) can provide quantitative support for evaluating the sustainability of biodegradation processes.…”

Section: Attenuation Processesmentioning

confidence: 99%

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A comprehensive approach to plume stability

Vanderford

2010

Remediation Journal

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This article defines and presents a systematic approach to groundwater plume-stability assessment.Qualitative and quantitative methods that have been used to assess plume stability at National Priority List sites undergoing optimization are reviewed. Example case studies are included to illustrate the advantages of combining multiple analysis methods. Relevant statistical methods include identifying normal data distributions, detection frequencies, coefficients of variation, individual well trends, and rates of change at individual monitoring locations. Trend estimates for total plume mass and center of mass provide a broader picture of plumewide processes. Deterministic methods, such as quantitative mass-balance approaches, may be useful for larger plumes. Qualitative assessments include evaluations of the conceptual site model, source strength, attenuation mechanisms, and hydrogeology. Because groundwater plumes are always dynamic, the determination of plume stability has to include qualitative steps relating the rate and magnitude of change to the goals and objectives of the program and the time frame over which critical management decisions are to be made. The assessment of plume stability is, therefore, presented as a process that should involve both qualitative and quantitative steps for determining the acceptability of variability in groundwater contaminant concentrations. O

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Closing the mass balance at chlorinated solvent sites: Sources and attenuation processes

Abstract: Using detailed mass balance and simple analytical models, a spreadsheet-based application (BioBalance)

Cited by 4 publications

References 13 publications

A Critical Review of the Modelling Tools for the Reactive Transport of Organic Contaminants

A Critical Review of the Modelling Tools for the Reactive Transport of Organic Contaminants

Cost Optimization of DNAPL Remediation at Dover Air Force Base Site

A comprehensive approach to plume stability

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