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Microbial-induced CaCO3 precipitation (MICP) is an innovative techniquethat harnesses bacterial activity for the modification of the physicalproperties of soils. Since stimulation of MICP by urea hydrolysis in naturalsoils is likely to be affected by interactions between ureolytic andnon-ureolytic bacteria, we designed an experiment to examine theinteractions between ureolytic and non-ureolytic bacteria and the effect ofthese interactions on MICP. An artificial groundwater-based rich medium wasinoculated with two model species of bacteria, the ureolytic species Sporosarcina pasteurii and thenon-ureolytic species Bacillus subtilis. The control treatment was inoculated with a pureculture of S. pasteurii. The following parameters were monitored during the course ofthe experiment: optical density, pH, the evolution of ammonium,dissolved calcium and dissolved inorganic carbon. The results showed thatdissolved calcium was precipitated as CaCO3 faster in the mixed culturethan in the control, despite less favorable chemical conditions in the mixedculture, i.e., lower pH and lower CO32− concentration. B. subtilis exhibiteda considerably higher growth rate than S. pasteurii, resulting in higher density ofbacterial cells in the mixed culture. We suggest that the presence of thenon-ureolytic bacterial species, B. subtilis, accelerated the MICP process, via thesupply of nucleation sites in the form of non-ureolytic bacterial cells

biogeosciences

Accelerated microbial-induced CaCO&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; precipitation in a defined coculture of ureolytic and non-ureolytic bacteria