IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 BOOK OF ABSTRACTS 60 Technologies and Applications Tuesday, 25 August 2026 / Hall B+C precipitation as apatite, competing with CaCO3 precipitation. Previous studies showed that CaCO3 precipitation occurs when bacteria have an organic energy source [2]. Because the aim here is to reduce CO2, by working in an inorganic growth media to precipitate carbonates with solely inorganic carbon sources, CaCO3 precipitation was challenging and the yields of carbonate precipitation were lower than in traditional experiments with organic-rich media. Improving the seal on the air tight bioreactors resulted in a better CaCO3 precipitation yield. The work in progress aim to optimize the precipitation and consequently CO2 capture by decoupling bacterial growth phase from the mineral precipitation phase by working with separate reactors. References 1. Dupraz, C., Visscher, P.T., 2005. Trends Microbiol. 13, 429–438. 2. Bundeleva, I.A., Shirokova, L.S., Bénézeth, P., Pokrovsky, O.S., Kompantseva, E.I., Balor, S., 2012. Chem. Geol. 291, 116–131.
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