Experimental Investigation of Microbial Induced Desaturation and Precipitation (MIDP) in a Layered Granular Soil System
Publication: Geo-Congress 2022
ABSTRACT
Microbially induced desaturation and precipitation (MIDP) is being investigated for its potential as a ground improvement method. The MIDP process involves stimulation of native denitrifying microorganisms by injecting a solution containing nitrate, calcium, and a source of dissolved organic carbon. Metabolic conversion of substrates into biogenic gas (nitrogen and carbon dioxide), biominerals (calcium carbonate), and biomass in sufficient quantities can mitigate liquefaction hazards in granular soils. This study aimed to investigate how soil stratification affects the distribution of substrates and metabolic products during and after MIDP treatment. A tank set-up simulating two-dimensional flow conditions was used. Multiple treatment cycles were applied to reach a significant amount of calcium carbonate. Bulk electrical conductivity measurements were used to monitor the distribution and consumption of ionic substrates throughout tank during treatment cycles. Post-treatment carbonate analysis showed that despite the spatially and temporally varying distribution of substrates, calcium carbonate was precipitated in all layers, both at the inlet and outlet, but the distribution was not homogeneous.
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Published online: Mar 17, 2022
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- Michael T. Stals, Gustav Andrag, Bas Vos, Leon A. van Paassen, Improving the Effectivity of Dynamic Compaction Methods in Silty Sands through Microbial Induced Desaturation (MID), Geo-Congress 2023, 10.1061/9780784484661.042, (402-410), (2023).