Limiting factors in ground water remediation

Hall, Clinton W.; Johnson, Jeffrey A.

doi:10.1016/0304-3894(92)85093-g

Cited by 9 publications

(3 citation statements)

References 1 publication

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“…Although the pump-and-treat (PAT) technique has been successful in some remediation efforts, it has, on the whole, not performed as well as had been expected. The primary obstacles to successful application of PAT are the following [Mackay and Cherry, 1989;Hall and Johnson, 1992]: (1) Pools of pure nonaqueous phase liquid (NAPL) present a continuing source of contamination by NAPL dissolution into groundwater, (2) heterogeneity of hydraulic conductivity prevents efficient flushing and contaminant removal from low-permeability regions, and (3) contaminant sorption to aquifer solids retards the advective rate of the plume toward the extraction well, requiring large volumes of water to be pumped, especially under conditions of slow contaminant desorption.…”

Section: Pump-and-treat Remediationmentioning

confidence: 99%

Use of temporal moments to investigate the effects of nonuniform grain‐size distribution on the transport of sorbing solutes

Cunningham¹,

Roberts²

1998

Water Resources Research

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Abstract. We use temporal moment analysis to examine the effects of nonuniform grain size on the transport of sorbing solute through porous media. We consider the case of advective-dispersive transport with sorption nonequilibrium governed by diffusion into spherical grains. For constant grain radius a and diffusion rate D a, the temporal moments for this problem are well known and have been reported elsewhere. In this paper, we consider the more realistic case, where there exists a distribution of diffusional timescales ta = a2/Da . The first and second temporal moments are unaffected by this distribution, but the third temporal moment is increased by a factor proportional to the variance of the distribution. This result holds regardless of the particular form of the distribution. Higherorder temporal moments depend on the higher-order moments of the distribution of ta. Thus, even if the mean diffusion rate is relatively fast, higher-order temporal moments of the solute transport may exhibit significant nonequilibrium effects; hence it may not be possible to decide the validity of the "local equilibrium assumption" based solely on the second temporal moment. Also, our analysis shows that in simulation of aquifer remediation by pump-and-treat, the appropriate choice for the contaminant desorption rate depends upon the remediation goal.

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Section: Pump-and-treat Remediationmentioning

confidence: 99%

Use of temporal moments to investigate the effects of nonuniform grain‐size distribution on the transport of sorbing solutes

Cunningham¹,

Roberts²

1998

Water Resources Research

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“…Petroleum hydrocarbons are introduced to the environment in a number of ways. The most common sources is leaking underground storage tanks that release millions gallon of NAPLs to groundwater systems annually [8], and during transportation. The source of contamination is usually classified in space as either a point source or a non-point (diffuse) source.…”

Section: Sources and Classifications Of Contaminantsmentioning

confidence: 99%

An Overview on the Organic Contaminants

Snousy¹

2017

SDRP-JESES

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“…The application is more convenient in the presence of highly mobile compounds, in particular for species that can be hardly treated via in situ remediation techniques. However, if the contamination is due to strongly adsorbing compounds, and/or when a nonaqueous phase acts as a continuous source, the barrier design is to be lead with particular care (Hall and Johnson 1992). Long-term costs associated with the barrier management and the extracted water treatment can then increase dramatically.…”

Section: Introductionmentioning

confidence: 99%

Automatic Delineation of Capture Zones for Pump and Treat Systems: A Case Study in Piedmont, Italy

Tosco¹,

Molfetta²,

Sethi³

2010

Groundwater Monitoring Rem

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The design of a pump and treat (P&T) system for the hydraulic control of a contaminated plume in a confined aquifer is presented here. Being the system designed for the emergency containment of a nonaqueous phase liquid plume, the evaluation of the system’s short‐term efficiency was considered an important issue. For this reason, both time‐related and ultimate capture zones were defined. They were traced using the automatic protection area (APA) model, a capture‐zone delineation tool based on a hybrid forward‐backward particle tracking algorithm, that provides an automatic post‐processing encirclement of capture zones. Two simple indexes are here proposed for the evaluation of the performance of the hydraulic barrier, that is, the efficacy and efficiency indexes, calculated from the capture areas provided by APA. The discharge rates of the wells were dimensioned applying the APA algorithm, maximizing efficacy and efficiency of the barrier. Results proved both visually (via plotting of capture zones) and numerically (via calculation of the indexes) that the P&T system can provide a complete capture of the contaminated area and minimizes the volume of extracted water. Consequently, the APA algorithm was proved to be a useful tool in capture zone delineation. As a future perspective, it could be coupled with the real‐time measurement of pumping rates and water levels and be implemented as a part of a tuning tool for the management of the hydraulic barrier.

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Limiting factors in ground water remediation

Cited by 9 publications

References 1 publication

Use of temporal moments to investigate the effects of nonuniform grain‐size distribution on the transport of sorbing solutes

Use of temporal moments to investigate the effects of nonuniform grain‐size distribution on the transport of sorbing solutes

An Overview on the Organic Contaminants

Automatic Delineation of Capture Zones for Pump and Treat Systems: A Case Study in Piedmont, Italy

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