Effect of clay content in lead-contaminated soils on the distribution uniformity of biostimulated ureolytic bacteria
Effect of clay content in lead-contaminated soils on the distribution uniformity of biostimulated ureolytic bacteria
The uniformity of grouting in microbially induced carbonate precipitation (MICP) depends on the engineering properties of untreated soils, including clay content, porosity, and permeability. This study examined the uniformity of lead-contaminated soils with different clay contents treated via biostimulated MICP. The uniformity was assessed by monitoring pH, urea concentration, and bacterial activity in pore solutions. After one enrichment treatment, soils with higher clay content showed irregular bacterial distribution due to transport barriers. However, following two treatments, the pH exceeded 9.0 at most locations, and urea levels dropped below 50 mM, indicating a more uniform bacterial distribution. These results highlight the importance of multiple enrichment treatments for achieving uniform bacterial activity in soils with varying clay content, crucial for effective solidification and stabilization.
Shiqi Liu; Y. Zhang; H. Y. Qin; X. Xu; Ningjun Jiang
2025 International Conference on Bio-mediated and Bio-inspired Geotechnics (ICBBG2025)
General session: Bio-mediated methods for environmental protection and restoration
https://doi.org/10.53243/ICBBG2025-71
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