Actively facilitated permeable reactive barrier for remediation of TCE from a low permeability aquifer: Field application

Bekele, Dawit; Du, Jianhua; Freitas, Leandro Gomes de; Megharaj, Mallavarapu; Chadalavada, Sreenivasulu; Naidu, Ravi

doi:10.1016/j.jhydrol.2019.03.059

Cited by 21 publications

(5 citation statements)

References 12 publications

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“…The efficiency of groundwater remediation has become increasingly important due to substantial pollution and rising water demand throughout the world. The technique of groundwater remediation includes pump‐and‐treat and in‐situ remediation (e.g., Bear & Sun, 1998; Bekele et al., 2019; Blowes et al., 1997; Brusseau & Guo, 2014; Gibert et al., 2019; Mackay & Cherry, 1989; Mateas et al., 2017; Oostrom et al., 1999). A classical strategy of in‐situ remediation injects treatment solutions into the polluted aquifer and facilitates the degradation of contaminants by bioremediation (e.g., Devlin et al., 2004; Domenico & Schwartz, 1998).…”

Section: Introductionmentioning

confidence: 99%

Effective Chemical Delivery Through Multi‐Screen Wells to Enhance Mixing and Reaction of Solute Plumes in Porous Media

Xie

et al. 2021

Water Resources Research

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In‐situ groundwater remediation is usually limited by the incomplete mixing of reactive species due to creeping flow characteristics and limited dispersion in porous media. In this study, we propose a novel approach to deliver chemicals through a multi‐screen well (MSW) to enhance the in‐situ remediation efficiency without extra energy or labor costs. The basic idea is to separate the injected solution into several plumes to enlarge the contact area between injected chemical compounds and ambient contaminants and enhance the mass exchange flux and reactive mixing. We perform laboratory experiments and numerical simulations of steady‐state instantaneous reactive transport in two‐dimensional porous media. We consider three separate screens in an MSW for the injection of treatment solutions and compare its plume distributions with a classical single‐screen well system. The experimental results confirm our conjecture and demonstrate the reliability of the numerical model. Furthermore, we derive an optimal injection interval of the MSW system by comparing analytical and numerical methods and demonstrate its capability to achieve effective transverse mixing and reaction enhancement. An interval that is smaller than the optimal injection interval leads to the exhaustion of contaminants between the injected plumes and the coalescence of the separate injected plumes at the downgradient portion along the travel distance, which reduces the effectiveness of the MSW system. We also investigate the sensitivity of the injected concentration, individual screen length, transverse dispersivity, and seepage rate on the determination of the optimal injection interval and provide suggestions about the design of an MSW system.

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Section: Introductionmentioning

confidence: 99%

Effective Chemical Delivery Through Multi‐Screen Wells to Enhance Mixing and Reaction of Solute Plumes in Porous Media

Xie

et al. 2021

Water Resources Research

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“…To date, research into the EK-PRB technique remains insufficient. However, both the EK and PRB methods have been fully developed and successfully applied in engineering practice, providing a solid research basis for the EK-PRB technique (Lageman, 1993;Chung, 2009;Torres et al, 2017;Bekele et al, 2019). This technique can be expected to play an important role in the remediation of heavy metal-contaminated soils in the future.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method for Treating Heavy Metal-Contaminated Soil: The Combined Electrokinetics and Permeable Reactive Barrier Technique

Liu¹,

2021

J ENVIRON INFORM LET

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“…Groundwater containing soluble contaminants encounters the reactive material in the PRB and passes through it, resulting in the removal of the contaminants. PRB technology has been applied to treat groundwater contaminated with heavy metals [6][7][8], nutrients [9][10][11], radionuclide [12], petroleum hydrocarbons [13][14][15], and chlorinated solvents [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Configuration of Non-Pumping Reactive Wells Considering Minimum Well Spacing

et al. 2021

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A non-pumping reactive well (NPRW) is a subsurface structure that prevents contaminant spread using many non-pumping wells containing reactive media. For the construction of an effective NPRW, a sufficiently small spacing between wells is an important design factor to prevent contaminant leakage. However, close well construction is not recommended because of concerns about the decreased stability of adjacent wells under field conditions. In this research, we proposed a sawtooth array of NPRW as a practical configuration to minimize well spacing while meeting stability requirements in the field. To evaluate the performance of the novel NPRW configurations, a numerical modeling was conducted considering different well diameters and well spacings and their performance was compared taking into account the number of wells and the mass of the reactive material. The comparison results showed that the sawtooth configuration was more practical than a line of wells. The performance curve of NPRWs with the saw-toothed configuration was constructed from the relationship between the contaminant removal and configuration components (diameter and spacing of the well). This can be used to predict the contaminant removal performance of NPRWs with a sawtooth array.

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Actively facilitated permeable reactive barrier for remediation of TCE from a low permeability aquifer: Field application

Cited by 21 publications

References 12 publications

Effective Chemical Delivery Through Multi‐Screen Wells to Enhance Mixing and Reaction of Solute Plumes in Porous Media

Effective Chemical Delivery Through Multi‐Screen Wells to Enhance Mixing and Reaction of Solute Plumes in Porous Media

A Novel Method for Treating Heavy Metal-Contaminated Soil: The Combined Electrokinetics and Permeable Reactive Barrier Technique

Configuration of Non-Pumping Reactive Wells Considering Minimum Well Spacing

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