Next Article in Journal
Precipitation and Flow Variations in the Lancang–Mekong River Basin and the Implications of Monsoon Fluctuation and Regional Topography
Previous Article in Journal
Assessment of the Requirements within the Environmental Monitoring Plans Used to Evaluate the Environmental Impacts of Desalination Plants in Chile
Open AccessArticle

Effects of a Groundwater Heat Pump on Thermophilic Bacteria Activity

1
The Research Institute for Earth Resources, Kangwon National University, Chuncheon 24341, Korea
2
Department of Geology, Kangwon National University, Chuncheon 24341, Korea
3
Critical Zone Frontier Research Laboratory (CFRL), Kangwon National University, Chuncheon 24341, Korea
*
Author to whom correspondence should be addressed.
Water 2019, 11(10), 2084; https://doi.org/10.3390/w11102084
Received: 2 September 2019 / Revised: 2 October 2019 / Accepted: 4 October 2019 / Published: 6 October 2019
(This article belongs to the Special Issue Influence of Geothermal Heat Pumps on Groundwater)
Groundwater samples were collected from the tubular wells of a groundwater heat pump (GWHP), and the psychrophilic, mesophilic, and thermophilic bacteria inhabiting the collected groundwater were cultured and isolated. Using the isolated bacteria, we analyzed temperature-dependent changes in autochthonous bacteria based on the operation of the GWHP. Microbial culture identified eight species of bacteria: five species of thermophilic bacteria (Anoxybacillus tepidamans, Bacillus oceanisediminis, Deinococcus geothermalis, Effusibacillus pohliae, and Vulcaniibacterium thermophilum), one species of mesophilic bacteria (Lysobacter mobilis), and two species of psychrophilic bacteria (Paenibacillus elgii and Paenibacillus lautus). The results indicated A. tepidamans as the most dominant thermophilic bacterium in the study area. Notably, the Anoxybacillus genus was previous reported as a microorganism capable of creating deposits that clog above-ground wells and filters at geothermal power plants. Additionally, we found that on-site operation of the GWHP had a greater influence on the activity of thermophilic bacteria than on psychrophilic bacteria among autochthonous bacteria. These findings suggested that study of cultures of thermophilic bacteria might contribute to understanding the bio-clogging phenomena mediated by A. tepidamans in regard to GWHP-related thermal efficiency.
Keywords: groundwater heat pump; culturable bacteria; thermophilic bacteria; Anoxybacillus groundwater heat pump; culturable bacteria; thermophilic bacteria; Anoxybacillus
MDPI and ACS Style

Kim, H.; Lee, J.-Y. Effects of a Groundwater Heat Pump on Thermophilic Bacteria Activity. Water 2019, 11, 2084.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop