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Compared with the production of ordinary Portland cement (OPC) with large carbon emissions, biological carbon sequestration to prepare low-carbon cement can effectively decrease carbon dioxide (CO 2 ) emissions, which can reduce the greenhouse effect, thereby reducing the frequency and intensity of climate disasters. Carbon-capturing bacteria (CCB) can capture atmospheric CO 2  and convert it into bicarbonate ions, which can be combined with calcium ions to form CaCO 3  cement that can partially replace OPC for dust control. This study compared the ability of two CCBs ( Paenibacillus mucilaginosus  and  Streptomyces microflavus  ) to capture CO 2 . The biomineralization efficiency of CaCO 3  for  P. mucilaginosus  (39.34%) was much higher than that for  S. microflavus  (7.38%) in a Ca(NO 3 ) 2  solution in the concrete-curing room environment. The decomposition temperature of the CaCO 3  crystals in DI was slightly higher than that of  P. mucilaginosus  and significantly higher than that of  S. microflavus . When the spraying time was equal to three, 10% carbide sludge (CS) content was optimal according to the surface hardness (HD) of the consolidation layer of the sand samples. The CaCO 3  mineralized by CCBs can be used to consolidate desert sand and dust in practical engineering applications.

Microbially/CO 2 -derived CaCO 3 cement and its microstructural and mechanical performance