ASSESSMENT OF EMBANKMENT EROSION OF LATERITIC SOIL BIO-TREATED WITH BACILLUS THURINGIENSIS

Ianna Moris Kanyi, Godwin Lazhi Yisa, Stephen Thomas, Oshioname Adrian Eberemu, Kolawole Juwonlo Osinubi

Abstract


The research evaluated the potential of ureolytic organism (Bacillus thuringiensis, Bt) through microbial induced carbonate precipitation technique in mitigating lateritic soil erosion. The urease activity and the pH of the varying bacterial (0, 1.5 × 108, 6.0 × 108, 1.2 × 109, 1.8 × 109, and 2.4 × 109 cells/ml) and cementation solution, Cs(0.25 M, 0.5 M, 0.75 M and 1 M) mixtures was evaluated. The rate of soil detachment of natural and bio-treated modelled embankment slopes was tested using a fabricated jet erosion device in the laboratory. The results indicated that the urease activity evaluated using electrical conductivity method increased with increase in Cs and Bt density in solutions. The increase in EC values for the Cs is in the order: 1 M 0.75 M  0.5 M  0.25 M regardless of the bacterial population in solution mixtures. The recorded pH values fall within the range (i.e., 6 - 9) that reportedly favours an effective MICP process. The rate of soil detachment as well as total erosion mass decreased with higher bio-treatment with Bt - Cs. Therefore, lateritic soil bio-treated with Bacillusthuringiensis (Bt) (2.4 × 109 cells/ml) - cementation solution concentration (Cs) (0.75 M) using the mixing method can be used to mitigate embankment erosion rate of lateritic soil.

 Keywords:Bio-treatment,Embankment, Erosion, Lateritic soil, Bacillusthuringiensis


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References


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