Variation in time-to-compliance for pump-and-treat remediation of mass transfer-limited aquifers with hydraulic conductivity heterogeneity |
| |
Authors: | Gamze Güngör-Demirci Ay?egül Aksoy |
| |
Institution: | 1.Department of Environmental Engineering,Middle East Technical University,Ankara,Turkey;2.Department of Environmental Engineering,Kocaeli University,Kocaeli,Turkey |
| |
Abstract: | In this study, the impact of correlation length (λ) of hydraulic conductivity (K) heterogeneity on pump-and-treat (P&T) remediation period (time-to-compliance) for a mass transfer-limited aquifer is evaluated.
Additionally, impacts of variance (σ
2), different distributions of high and low K zones and different initial contaminant masses are explored. Two different P&T policies including different number of wells
pumping at different rates are employed for the investigation. Simulation–optimization approach in which a genetic algorithm
(GA) is linked with a groundwater flow and contaminant transport model is used. Results show that K heterogeneity, in terms of λ
ln K
, sln K2 \sigma_{\ln \,K}^{2} and respective locations of low and high K zones, significantly impacts the time-to-compliance. Contaminant presence at low K zones can increase the time required to clean up the aquifer. Lower variation is observed in time-to-compliance for the remediation
design utilizing higher number of wells pumping at slower rates compared to the design with a single well pumping at a higher
rate. Higher number of wells increases the robustness of P&T remediation system when aquifer is heterogeneous in K. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|