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Title: Comparison of soil improvement methods using crude soybean enzyme, bacterial enzyme or bacteria induced carbonate precipitation
Authors: Cui, Ming-Juan
Lai, Han-Jiang
Wu, Shifan
Chu, Jian
Keywords: Engineering::Civil engineering
Issue Date: 2022
Source: Cui, M., Lai, H., Wu, S. & Chu, J. (2022). Comparison of soil improvement methods using crude soybean enzyme, bacterial enzyme or bacteria induced carbonate precipitation. Geotechnique, 1-9.
Project: MOE2015-T2-2-142
Journal: Geotechnique
Abstract: Either microbial or enzyme induced carbonate precipitation (MICP or EICP) has emerged to be alternative to cement-based ground improvement methods. For EICP, either plant urease or bacterial enzyme can be used. The effect of treatments can be different when different methods are adopted. In this study, the soil improvement effects among the three methods were compared. The newly developed one-phase-low-pH method was adopted for both the MICP and EICP processes in this study. The crude urease enzyme was extracted from soybean and urease producing bacteria. The results show that the amount of calcium carbonate induced by the crude soybean urease enzyme is comparable to that produced by bacteria or bacterial urease under the same urease activity. However, the treatment using the crude soybean urease enzyme has the advantage of being more effective in enhancing the strength and reducing the permeability of soil than the other two treatments, especially for the soil with small grain sizes. This can be explained by the difference in the precipitation pattern of calcium carbonate using various urea hydrolysis media.
ISSN: 0016-8505
DOI: 10.1680/jgeot.21.00131
Schools: School of Civil and Environmental Engineering 
Rights: © 2022 Thomas Telford Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles

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