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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-1472
Vol. 13, No. 3, 2016, pp. 937-944
Bioline Code: st16089
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 13, No. 3, 2016, pp. 937-944

 en Performance of microbial-induced carbonate precipitation on wind erosion control of sandy soil
Maleki, M.; Ebrahimi, S.; Asadzadeh, F. & Emami Tabrizi, M.

Abstract

Wind erosion is a serious problem throughout the world which results in soil and environment degradation and air pollution. The main objective of this study was to evaluate feasibility of microbial-induced carbonate precipitation, as a novel soil-strengthening technique, to reduce wind erosion risk of a sandy soil. For this purpose, the erosion of biocemented soil samples was investigated experimentally in a wind tunnel under the condition of wind velocity of 45 km h-1. The weight loss of treated samples relative to the weight loss of control treatment was 1.29 and 0.16 % for low and high bacterial mix concentrations, respectively, indicating a significant improvement in erosion control in biologically treated samples. The effect of biological treatment on wind erosion control was even superior at the higher velocities. Thereafter, the penetration resistance of the surface layers as a simple index of resistance against wind erosion was measured. Significant improvements in the penetration resistance of the treated soil samples were observed. Although low bacterial mix concentrations did not significantly improve the penetration resistance of the samples, significant improvements in the penetration resistance of the treated soil samples were observed reaching to the highest measured strength (56 kPa) in high bacterial mix concentrations samples. Finally, the morphology of precipitated CaCO3 crystals using scanning electron microscopy and X-ray powder diffraction analysis showed that the CaCO3 was mainly precipitated as vaterite crystals forming pointto- point contacts between the sand granules.

Keywords
Biocement; Microbial-induced carbonate precipitation; Soil treatment; Wind erosion control; Urease

 
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