Evaluation of microbially Induced calcite precipitation (MICP) methods on different soil types for wind erosion control
| Autor: | Kyoungphile Nam, Seung Hee Chae, Hyeonyong Chung |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Calcite
Environmental Engineering 010504 meteorology & atmospheric sciences Soil science Soil classification 010501 environmental sciences 01 natural sciences chemistry.chemical_compound chemistry Aeolian processes Environmental science Soil treatment Precipitation 0105 earth and related environmental sciences |
| Zdroj: | Environmental Engineering Research. 26 |
| ISSN: | 2005-968X 1226-1025 |
| DOI: | 10.4491/eer.2019.507 |
| Popis: | Application methods (i.e., pouring and mixing method) of Microbially Induced Calcite Precipitation (MICP) and its effect on wind erosion were investigated on four soil types (i.e., medium sand, fine sand, loamy fine sand and loam). With mixing method, calcite precipitated evenly throughout the upper part (0 - 5 cm) of all the soils tested, but with pouring method, only medium sand showed even calcite distribution. The reason can be ascribed to the limited permeability of MICP-inducing solution (i.e., calcium, urea and Sporosarcina pasteurii) through loamy fine sand and loam due to their low hydraulic conductivity (i.e., < 10-5 cm/s). Moreover, bacterial penetrability was also reduced by calcium (i.e., 70 to 20%) in fine sand. Hence, pouring method for medium sand and mixing method for the others were applied with various MICP-inducing solution concentrations (i.e., 0.1 to 1 M of urea and calcium). When exposed to wind of 15 m/s after MICP application, 0.25 M solution in medium and fine sand, and 0.1 M solution in loamy fine sand and loam showed little or no soil loss. The results suggest that a proper application method be chosen considering soil properties that affect even calcite distribution to mitigate soil erosion. |
| Databáze: | OpenAIRE |
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