Biostabilization of Desert Sands Using Bacterially Induced Calcite Precipitation
Biostabilization of Desert Sands Using Bacterially Induced Calcite Precipitation
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DOI：
10.1080/01490451.2015.1053584
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发表时间：
2016-02
影响因子：
2.3
通讯作者：
Fei Chen;C. Deng;Wenjuan Song;Daoyong Zhang;F. Al-Misned;M. Mortuza;G. Gadd;Xiangliang Pan
中科院分区：
文献类型：
--
作者：
Fei Chen;C. Deng;Wenjuan Song;Daoyong Zhang;F. Al-Misned;M. Mortuza;G. Gadd;Xiangliang Pan
沙尘暴已成为日益严重的全球性环境问题，迫切需要探索具有成本效益的绿色技术来稳定沙漠地区的沙质。在本研究中，研究了一种具有溶尿作用的芽孢杆菌对砂土的稳定作用。芽孢杆菌可通过水解尿素，生成方解石和文石等矿物，有效固结砂粒。冻融循环12 d后，生物稳定砂在33 m s−1风速下仍具有较高的抗侵蚀能力。生物稳定砂的抗压强度与细胞密度、Ca2+和尿素浓度有关。较高的细胞密度、尿素和Ca2+浓度降低了抗压强度。从性能和成本考虑，最佳细胞密度、Ca2+和尿素浓度分别为OD600 0.4、15 mM和20 g L−1。该研究表明，微生物诱导碳酸盐降水（MICP）对土壤的生物稳定具有预防沙尘暴和土壤风蚀的潜力。
ABSTRACT 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 precipitation (MICP) has potential for the prevention of sand storms and wind erosion of soil.