Journal
GEOTHERMICS
Volume 86, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.geothermics.2020.101812
Keywords
Groundwater circulation well; Open geothermal system; Groundwater; Microbiology; qPCR; Iron bacteria
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Funding
- Federal Ministry of Education and Research (BMBF) [01LY1507A/B]
- German Aerospace Center (DLR) as part of the KMU-innovativ: Ressourceneffizienz und Klimaschutz funding program [01LY1507A/B]
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Groundwater circulation wells provide an alternative source of geothermal energy to more commonly used shallow open two-well systems. Their efficiency and impacts on groundwater chemistry and microbiology have not previously been investigated. We have monitored newly installed and pre-existing systems over a two-year period. Monthly hydrochemical measurements and microbial qPCR analyses of circulated water showed no changes in the groundwater composition, at least as long as no oxygen entered. None of the systems showed any clogging or precipitation, even where the groundwater had a high ferrous iron concentration, which has previously been considered to be unsuitable for open geothermal systems.
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