Impacts of Shallow Geothermal Energy on Groundwater Quality

Matthijs Bonte

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IWA Publishing img Link Publisher

Naturwissenschaften, Medizin, Informatik, Technik / Bau- und Umwelttechnik

Beschreibung

The use of shallow geothermal energy (SGE) systems to acclimatize buildings has increased exponentially in the Netherlands and worldwide. In certain areas, SGE systems are constructed in aquifers also used for drinking water supply raising the question of potential groundwater quality impact. Impacts of Shallow Geothermal Energy on Groundwater Quality provides a hydrochemical and geomicrobialoverview of the effects of ground source heat pumps and aquifer thermal energy storage. The area is investigated with field and laboratory experiments, and reactive transport models, showing that shallow geothermal energy systems can influence groundwater quality in a number of ways. Most prominent inopen ground source heating systems operating at low temperature(<20C) is the physical mixing of deep and shallow groundwater of different quality distorting the natural water quality stratification in aquifers. At a temperature of 25C and beyond certain trace elements were observed to mobilize in laboratory experiments, and beyond 40C redox conditions change significantly while the microbial community shift towards a thermophilic community.Based on the results of this research, guidelines are presented for monitoring and permitting of SGE systems. The book is a useful resource for regulators of these systems, water companies and installers of the SGE systems.Author: Matthijs Bonte, Amsterdam, The Netherlands

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