Articles | Volume 54
Adv. Geosci., 54, 217–227, 2021
Adv. Geosci., 54, 217–227, 2021

  31 Mar 2021

31 Mar 2021

Interactions between the calcium scaling inhibitor NC47.1 B, geothermal fluids, and microorganisms – results of in situ monitoring in the Bavarian Molasse Basin (Germany) and accompanying laboratory experiments

Christoph Otten et al.

Cited articles

Ahmed, B., Cao, B., McLean, J. S., Ica, T., Dohnalkova, A., Istanbullu, O., Paksoy, A., Fredrickson, J. K., and Beyenal, H.: Fe(III) reduction and U(VI) immobilization by Paenibacillus sp. strain 300A, isolated from Hanford 300A subsurface sediments, Appl. Environ. Microb., 78, 8001–8009,, 2012. 
Apprill, A., McNally, S., Parsons, R., and Weber, L.: Minor revision to V4 region SSU rRNA 806R gene primer greatly increases detection of SAR11 bacterioplankton, Aquat. Microb. Ecol., 75, 129–137,, 2015. 
Blumer-Schuette, S. E., Brown, S. D., Sander, K. B., Bayer, E. A., Kataeva, I., Zurawski, J. V., Conway, J. M., Adams, M. W. W., and Kelly, R. M.: Thermophilic lignocellulose deconstruction, FEMS Microbiol. Rev., 38, 393–448,, 2014. 
Bredholt, S., Sonne-Hansen, J., Nielsen, P., Mathrani, I. M., and Ahring, B. K.: Caldicellulosiruptor kristjanssonii sp. nov., a cellulolytic, extremely thermophilic, anaerobic bacterium, Int. J. Syst. Bacteriol., 49, 991–996,, 1999. 
Cypionka, H.: Grundlagen der Mikrobiologie, Edn. 4, überarb. und aktualisierte Aufl., Springer-Lehrbuch, Springer, Berlin, Germany, 339 pp., 2010 (in German). 
Short summary
Mineral precipitation in filters and heat exchangers can impede geothermal plant operation and cause expensive losses of efficiency. To prevent scaling a biodegradable inhibitor has been applied in a geothermal plant. Water monitoring revealed no significant chemical changes, but an adaption of the microbial community as well as a higher abundance of Bacteria after heat extraction. Laboratory experiments under anaerobic conditions showed that the inhibitor can be almost completely metabolized.