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Mineralization process of biological solidified sand and effects of bacteria and calcium concentration on crystal morphology

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Document pages: 13 pages

Abstract: Microbial induced calcite precipitation (micp) is a sustainable sandy soil improvement technology. The analysis of the mineralization process and the effects of different bacterial suspensions and calcium concentrations on crystal morphology shows that the mineralization process includes four stages: microbial self-organizing hydrolysis, molecular recognition and interface interaction, growth regulation and epitaxial growth. With the increase of bacterial suspension concentration and calcium concentration, the crystal morphology changed from hexahedron to oblique polyhedron and then to ellipsoid; The best crystal structure appears when OD600 = 1.0 and [Ca2 +] = 0.75   mol L. It should be noted that the interfacial hydrogen bond is the main force for bonding loose sand particles. These results will help to understandnding the mechanism of MICP.

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