Pump-and-treat configurations with vertical and horizontal wells to remediate an aquifer contaminated by hexavalent chromium

Pump-and-treat technology is among the most used technologies for groundwater remediation. While conventional, vertical wells (VRWs) are well-known and used from long time, horizontal wells (HRWs) have been explored for remediation technologies only in last few decades. HRWs have shown to outperform...

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Vydáno v:Journal of contaminant hydrology Ročník 235; s. 103725
Hlavní autoři: Bortone, Imma, Erto, Alessandro, Nardo, Armando Di, Santonastaso, Giovanni F., Chianese, Simeone, Musmarra, Dino
Médium: Journal Article
Jazyk:angličtina
Vydáno: Netherlands Elsevier B.V 01.11.2020
Témata:
chromium
Chromium - analysis
Computational fluid dynamic (CFD)
cost analysis
finite element analysis
Groundwater
Groundwater remediation
Hexavalent chromium
Horizontal wells
prices
Pump and treat
remediation
unconfined aquifer
Water Wells
Hexavalent chromium
Groundwater remediation
Horizontal wells
Computational fluid dynamic (CFD)
Pump and treat
ISSN:0169-7722, 1873-6009, 1873-6009
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Shrnutí:Pump-and-treat technology is among the most used technologies for groundwater remediation. While conventional, vertical wells (VRWs) are well-known and used from long time, horizontal wells (HRWs) have been explored for remediation technologies only in last few decades. HRWs have shown to outperform vertical wells in terms of versatility, productivity and clean-up times under certain conditions. In this paper, the efficacy of an innovative pump-and-treat (P&T) configuration for groundwater remediation obtained by adopting either VRWs or HRWs technology is comparatively tested. A 3D transient finite element model of an unconfined aquifer containing a hexavalent chromium (Cr(VI)) contamination plume is considered to compare a single horizontal well configuration vs a range of spatially-optimised arrays containing vertical wells. A sensitivity analysis aimed at finding the best configuration to minimise the remediation time and the related cost is carried out by comparing different well diameters, D, pumping rates, Q, and position of wells. A comparative cost analysis demonstrates that, for the examined case-study, a single HRW achieves the clean-up goals in the same time span as for a greater number of vertical wells, but at higher price due to the excavation costs. •Remediation of an aquifer contaminated by hexavalent chromium.•3D aquifer modelling and Pump and treat technology application.•Efficiency and cost comparison of vertical wells vs horizontal wells, from single to multiple wells application.•Best performance obtained with horizontal wells.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:0169-7722
1873-6009
1873-6009
DOI:10.1016/j.jconhyd.2020.103725