Experiment Research from Macro to Micro on Microbial-Induced Clogging by Adding Potato Soup in Beijing Sand Column
Experiment Research from Macro to Micro on Microbial-Induced Clogging by Adding Potato Soup in Beijing Sand Column
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DOI：
10.1061/41165(397)418
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发表时间：
2011-03
期刊：
影响因子：
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通讯作者：
Hechao Zhang;Hongxian Guo;Meng Li;Xiaohui Cheng
中科院分区：
文献类型：
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作者：
Hechao Zhang;Hongxian Guo;Meng Li;Xiaohui Cheng
微生物堵塞是一种渗漏修复方法，是生物技术在土木工程中非常重要且有前景的应用。土壤中原有的微生物在得到养分供给后，代谢和繁殖变得密集，最终导致土壤导水率下降。 2009年在北京沙上进行了3次分别添加马铃薯汤、葡萄糖和水的沙柱实验。与荷兰更新世土壤和日本冲积沙中的Nutrolase一样，马铃薯汤可以降低北京沙的水力传导率，但葡萄糖则不能。通过ESEM和CT发现，在添加马铃薯汤和水的柱中，渗漏附近土壤的微观结构有所不同。位于沙柱不同位置的土壤样品的微生物数量和烧失量是不同的。施用马铃薯汤的沙柱土样中不同Fe含量均有显着增加。通过X射线衍射分析，泄漏点附近土样的矿物成分与初始砂样没有显着差异。结果表明，实验过程中有机物的产生是北京砂柱微生物堵塞的主要原因。
Microbial-induced clogging is a method of leakage repair, a very important and promising application of biological technology in civil engineering. Metabolism and reproduction of microorganisms original in the soil become intensive after nutrients are supplied, and finally the hydraulic conductivity of the soil is decreased. 3 sand-column experiments by adding potato soup, glucose and water respectively on Beijing sand were performed in 2009. Like Nutrolase in Dutch Pleistocene soil and Japanese alluvial sand, potato soup can decrease the hydraulic conductivity of Beijing sand, but glucose can't. By ESEM and CT, the microstructures of the soil near the leakage are found to be different in columns added potato soup and water. The quantity of microorganisms and the loss of ignition of soil samples located in different position of sand columns are different. Contents of different Fe in soil samples of sand column supplied with potato soup have a significant increase. By XRD, the mineral compositions of soil samples near the leakage showed no significant difference with the initial sand sample. The results showed that the production of organics during the experiment was a main cause of microbial-induced clogging in Beijing sand column.