| Cite this article: | 李焕弟,缴锡云,李江.基于MICP及EICP技术的土壤固化试验研究[J].灌溉排水学报,0,():-. |
| LIHUANDI,JIAOXIYUN,LIJIANG.基于MICP及EICP技术的土壤固化试验研究[J].灌溉排水学报,0,():-. |
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| Experimental Study on Soil Cementation Based on MICP and EICP Technology |
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LIHUANDI, JIAOXIYUN, LIJIANG
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College of Agricultural Science and Engineering, Hohai University
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| Abstract: |
| 【Background】Farmland drainage ditch is an important guarantee of agricultural safety in China. For the protection of farmland drainage ditch, soil hardening treatment, material improvement measures and other methods are not only high cost, but also difficult to maintain later, which may have a certain adverse impact on the environment. And a new soil cementation technology is urgently needed. In terms of farmland drainage ditch cementation, the technique of calcium carbonate precipitation induced by microorganism and urease is easy to operate, and the cementation effect can be controlled, and there is no negative impact on the environment. The use of the technique is an effective method to improve drainage ditch in constructing sustainable agriculture.【Objective】The ecological construction of farmland drainage ditch is conducive to the development of agriculture. The traditional soil cementation technology is complex in operation and difficult to maintain. The technology of Sporosarcina pasteurii and urease induced calcium carbonate precipitation can not only meet the requirements of soil cementation but also meet the ecological requirements. This technology can cement soil particles into a whole and effectively improve the stability of farmland drainage ditches. The purpose of this paper is to study the soil cementation effect based on MICP and EICP, Sporosarcina pasteurii and urease were used to catalyze urea hydrolysis to induce calcium carbonate deposition, so as to apply it to farmland drainage ditch, improve the stability of drainage ditch slope and its environmental friendliness.【Method】Sporosarcina pasteurii group and urease group were set up in this study. Sporosarcina pasteurii and urease were mixed with the cementation solution (urea-calcium chloride solution) in different proportions to explore the difference of calcite content between them. The ratio of Sporosarcina pasteurii solution and cementation solution was 1:3, 2:3, 1:1, 4:3 and 5:3. The ratio of urease solution was the same as that of Sporosarcina pasteurii solution and cementation solution. Furthermore, experiments were conducted for cementing soil by spraying microbial solution/urease solution and the cementation solution to the surface of soil. The soil surface morphology, content of calcite and soil microstructure under different spray round times were performed to compare the difference of Sporosarcina pasteurii and urease.【Result】Sporosarcina pasteurii and urease can be used as catalysts for MICP and EICP technology to hydrolyze urea and form calcium carbonate crystals with calcium chloride solution. When the ratio of microbial solution and cementation solution is 2:3, the effect is better. However, when the ratio of urease solution and cementation solution is 5:3, the better effect can be obtained.The highest calcium yield of Sporosarcina pasteurii group and urease group was 86.7%, 84.1%, respectively. After spraying the soil with the ratio of 2:3 for several times, surface cracks in the soil are repaired and the calcite produced by the microbial treatment is higher than that of the urease treatment, the difference between the two treatments decreased gradually in the later stage. Calcium carbonate crystals formed by Sporosarcina pasteurii and urease are different.【Conclusion】Sporosarcina pasteurii and urease catalyze the hydrolysis of urea to form calcite, which can be filled between soil particles to achieve good soil cementation effect. Under the condition of this study, the cementation effect of Sporosarcina pasteurii treatment slightly better than that of urease treatment. |
| Key words: Sporosarcina pasteurii; urease; soil cementation; calcite content; microstructure |
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