Remediation Potential of Borehole Thermal Energy Storage for Chlorinated Hydrocarbon Plumes: Numerical Modeling in a Variably-Saturated Aquifer
Open Access
- 13 December 2021
- journal article
- research article
- Published by Frontiers Media SA in Frontiers in Earth Science
Abstract
Underground thermal energy storage is an efficient technique to boost the share of renewable energies. However, despite being well-established, their environmental impacts such as the interaction with hydrocarbon contaminants is not intensively investigated. This study uses OpenGeoSys software to simulate the heat and mass transport of a borehole thermal energy storage (BTES) system in a shallow unconfined aquifer. A high-temperature (70 C) heat storage scenario was considered which imposes long-term thermal impact on the subsurface. Moreover, the effect of temperature-dependent flow and mass transport in a two-phase system is examined for the contaminant trichloroethylene (TCE). In particular, as subsurface temperatures are raised due to BTES operation, volatilization will increase and redistribute the TCE in liquid and gas phases. These changes are inspected for different scenarios in a contaminant transport context. The results demonstrated the promising potential of BTES in facilitating the natural attenuation of hydrocarbon contaminants, particularly when buoyant flow is induced to accelerate TCE volatilization. For instance, over 70% of TCE mass was removed from a discontinuous contaminant plume after 5 years operation of a small BTES installation. The findings of this study are insightful for an increased application of subsurface heat storage facilities, especially in contaminated urban areas.Keywords
Funding Information
- National Natural Science Foundation of China (41902311)
- Bundesministerium für Wirtschaft und Energie (03ET6122B)
- China Scholarship Council
This publication has 49 references indexed in Scilit:
- Simulating an exclusion zone for vapour intrusion of TCE from groundwater into indoor airJournal of Contaminant Hydrology, 2012
- Semianalytical Model Predicting Transfer of Volatile Pollutants from Groundwater to the Soil SurfaceEnvironmental Science & Technology, 2010
- Simulating the fate and transport of TCE from groundwater to indoor airJournal of Contaminant Hydrology, 2009
- Two-phase, partially miscible flow and transport modeling in porous media; application to gas migration in a nuclear waste repositoryComputational Geosciences, 2008
- Numerical simulation of non-isothermal multiphase multicomponent processes in porous media.: 2. Applications for the injection of steam and airAdvances in Water Resources, 2002
- Evaluation of Thermal Effects on the Dissolution of a Nonaqueous Phase Liquid in Porous MediaEnvironmental Science & Technology, 1997
- Transport of volatile organic compounds across the capillary fringeWater Resources Research, 1993
- Combined natural and forced convection in a horizontal porous channelInternational Journal of Heat and Mass Transfer, 1984
- A Closed-form Equation for Predicting the Hydraulic Conductivity of Unsaturated SoilsSoil Science Society of America Journal, 1980
- Gas Diffusion in Porous MediaScience, 1959