Arrays of unpumped wells for plume migration control by semi-passive in situ remediation

Arrays of unpumped wells can be used as discontinuous permeable walls in which each well serves both as a means to focus ground water flow into the well for treatment and as a container either for permeable reactive media which directly destroy dissolved ground water contaminants or for devices or m...

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Bibliographic Details
Published in:Ground water monitoring & remediation 1997, Vol.17 (3), p.185-193
Main Authors: Wilson, R.D, Mackay, D.M, Cherry, J.A
Format: Article
Language:English
Subjects:
AMENDMENTS
CONTAMINANTES
CONTAMINANTS
CORRIENTES SUBTERRANEAS
COURANT SOUTERRAIN
DISSOLVED PHASE CONTAMINATION CLEANUP
GROUNDWATER FLOW
GROUNDWATER POLLUTION
POLLUANT
POLLUTANTS
POLLUTION DE L'EAU SOUTERRAINE
POLUCION DE AGUAS SUBTERRANEAS
POZOS
PUITS
WELLS
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Summary:Arrays of unpumped wells can be used as discontinuous permeable walls in which each well serves both as a means to focus ground water flow into the well for treatment and as a container either for permeable reactive media which directly destroy dissolved ground water contaminants or for devices or materials which release amendments that support in situ degradation of contaminants within the aquifer downgradient of the wells. This paper addresses the use of wells for amendment delivery, recognizing the potential utility of amendments such as electron acceptors (e.g., oxygen, nitrate), electron donors (primary substrates), and microbial nutrients for stimulating bioremediation, and the potential utility of oxidizers, reducers, etc for controlled abiotic degradation. Depending on its rate and constraints, the remedial reaction may occur within the well and/or downgradient. For complete remediation of ground water passing through the well array, the total flux of amendment released must meet or exceed the total flux demand unposed by the plume. When there are constraints on the released concentration of amendment (relative to the demand), close spacing of the wells may be required. If the flux balance allows wider spacing, it is likely that limited downgradient spreading of the released amendment will then be the primary constraint on interwell spacing. Divergent flow from the wells, roughly two times the well diameter, provides the bulk of downgradient spreading and constrains maximum well spacing in the absence of significant lateral dispersion. Stronger lateral dispersion enhances the spreading of amendment, thereby increasing the lateral impact of each well, which allows for wider well spacing
ISSN:1069-3629
1745-6592
DOI:10.1111/j.1745-6592.1997.tb00594.x