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首页> 外文期刊>International Journal of Environmental Science and Technology >Performance of microbial-induced carbonate precipitation on wind erosion control of sandy soil
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Performance of microbial-induced carbonate precipitation on wind erosion control of sandy soil

机译：微生物引起的碳酸盐沉淀对沙质土壤风蚀的控制作用

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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 point-to-point contacts between the sand granules.
机译：风蚀是全世界的一个严重问题，导致土壤和环境退化以及空气污染。这项研究的主要目的是评估微生物诱导的碳酸盐沉淀作为一种新的土壤强化技术以降低沙土的风蚀风险的可行性。为此，在风速为45 km h（-1）的条件下，在风洞中对生物水泥土壤样品的侵蚀进行了实验研究。对于低和高细菌混合物浓度，相对于对照处理的重量损失，处理后样品的重量损失分别为1.29和0.16％，这表明生物处理样品中侵蚀控制的显着改善。在较高的速度下，生物处理对风蚀控制的效果甚至更高。此后，测量表面层的抗穿透性，作为抗风蚀的简单指标。观察到处理过的土壤样品的抗穿透性有了显着提高。尽管低细菌混合物浓度并不能显着改善样品的抗渗透性，但是在高细菌混合物浓度样品中，观察到处理过的土壤样品的抗渗透性有了显着提高，达到了最高的测量强度（56 kPa）。最后，使用扫描电子显微镜和X射线粉末衍射分析的沉淀的CaCO3晶体的形态表明，CaCO3主要沉淀为球rite石晶体，形成砂粒之间的点对点接触。

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