Toward enhanced remediation methods using chaotic advection

Michael G. Trefry, Guy Metcalfe, Daniel R. Lester, Alison Ord, Klaus Regenauer-Lieb

Research output: Chapter in Book/Conference paperConference paper

Abstract

Many remediation activities in the terrestrial subsurface involve the need to recover/emplace distributions of scalar quantities (e.g. dissolved phase concentration and heat) from/in volumes of saturated porous media. These scalars can be targeted by pump-and-treat technologies, where target fluids are abstracted from the porous medium, or by amendment technologies, were specific chemicals or substrates are injected into the porous medium in order to promote beneficial transformations of water quality or mineralogy. Application examples include in situ leaching for precious metals, recovery of dissolved contaminant plumes, or harvesting of heat energy from geothermal reservoirs. While conventional pumping methods work reasonably well, costs associated with maintaining pumping schedules are high and improvements in efficiency would be welcome. In this paper we discuss how transient switching of the pressure at different wells can intimately control subsurface flow, generating a range of "programmed" flows with various beneficial characteristics. Some programs produce chaotic mixing flows which deliver rapid transport, whilst others create encapsulating flows which can confine pollutants for in situ treatment. In a simplified model of an aquifer subject to balanced injection and extraction pumping, chaotic flow topologies have been predicted theoretically and verified experimentally using Hele-Shaw cells. Mixing enhancement due to chaotic advection and kinematic confinement of aquifer volumes are key features of the chaotic dynamics. Understanding these phenomena may form the basis for new efficient technologies for groundwater remediation or amendment.

Original languageEnglish
Title of host publicationGQ10
Subtitle of host publicationGroundwater Quality Management in a Rapidly Changing World
Pages217-220
Number of pages4
Volume342
Publication statusPublished - 1 Dec 2011
Event7th International Groundwater Quality Conference: Groundwater Quality Management in a Rapidly Changing World, GQ10 - Zurich, Switzerland
Duration: 13 Jun 201018 Jun 2010

Conference

Conference7th International Groundwater Quality Conference: Groundwater Quality Management in a Rapidly Changing World, GQ10
CountrySwitzerland
CityZurich
Period13/06/1018/06/10

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  • Cite this

    Trefry, M. G., Metcalfe, G., Lester, D. R., Ord, A., & Regenauer-Lieb, K. (2011). Toward enhanced remediation methods using chaotic advection. In GQ10: Groundwater Quality Management in a Rapidly Changing World (Vol. 342, pp. 217-220)