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As one of the emerging soil improvement techniques, microbial induced calcite precipitation (MICP) can bond soil grains together and improve the engineering properties of soil 1. bacteria produces urease enzyme can catalyze urea to carbonate and result in calcite precipitation in elevated pH environment. The forms of calcite precipitation around the bacteria limit the availability of oxygen and nutrient to the bacteria and reduce the efficiency of bacteria in producing urease enzyme. The MICP faces challenge of non-uniformity of calcite precipitation and very limited penetration depth in the treated soil that may limit the application of this innovative soil binding technology 2-3.
Li et al. (Sat,) studied this question.