Biostabilization of Desert Sands Using Bacterially Induced Calcite Precipitation
| Autor: | Daoyong Zhang, Fahad A. Al-Misned, Chen Fei, Xiangliang Pan, Wenjuan Song, M. Golam Mortuza, Geoffrey M. Gadd, Chunnuan Deng |
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| Rok vydání: | 2016 |
| Předmět: |
Calcite
Aragonite 0211 other engineering and technologies Mineralogy High cell 02 engineering and technology 010501 environmental sciences engineering.material 01 natural sciences Microbiology chemistry.chemical_compound Compressive strength chemistry parasitic diseases 021105 building & construction Cell density Earth and Planetary Sciences (miscellaneous) Urea engineering Environmental Chemistry Carbonate Aeolian processes Geology 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Geomicrobiology Journal. 33:243-249 |
| ISSN: | 1521-0529 0149-0451 |
| DOI: | 10.1080/01490451.2015.1053584 |
| Popis: | Sand storms have become a growing global environmental issue and there is an urgent need to explore cost-effective green technologies to stabilize the sands of desert regions. In this study, the performance of a ureolytic Bacillus sp. for stabilization of sands was evaluated. The Bacillus sp. could efficiently consolidate sand particles by hydrolysis of urea and the subsequent production of calcite and aragonite minerals. The biostabilized sands had a high resistance to erosion by a 33 m s−1 wind speed even after 12-d exposure to freeze-thaw cycles. The compressive strength of biostabilized sands was dependent on the applied cell density and concentrations of Ca2+ and urea. High cell densities, urea and Ca2+ concentrations reduced the compressive strength. The optimal cell density, Ca2+ and urea concentrations were OD600 0.4, 15 mM and 20 g L−1, respectively, when performance and cost were considered. This study shows that biostabilization of sand based on microbially induced carbonate precipitati... |
| Databáze: | OpenAIRE |
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