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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 347-355 |
| Number of pages | 9 |
| Journal | Geotechnical Special Publication |
| Volume | 2022-March |
| Issue number | GSP 331 |
| DOIs | |
| State | Published - 2022 |
| Event | 2022 GeoCongress: State of the Art and Practice in Geotechnical Engineering - Soil Improvement, Geosynthetics, and Innovative Geomaterials - Charlotte, United States Duration: Mar 20 2022 → Mar 23 2022 |
ASJC Scopus subject areas
- Civil and Structural Engineering
- Architecture
- Building and Construction
- Geotechnical Engineering and Engineering Geology