An experimental approach to microbial carbonate precipitation in improving the engineering properties of sandy soils

Annals of Microbiology

Esra Sunduz Yigittekin¹  Sadik Dincer¹  Zahraddeen Kabir Sani¹  Fatima Masume Uslu¹  Baki Bagriacik² 

[1] Department of Biology, Faculty of Science and Letter Cukurova University;Department of Civil Engineering, Faculty of Engineering, Cukurova University;

关键词: Soil improvement;    Bacillus sp.;    Time-dependent behaviour;    Sustainability;    Microbial carbonate precipitation;    Sandy soil;   

DOI  :  10.1186/s13213-021-01644-6

来源: DOAJ

【 摘 要 】

Abstract Purpose Stabilization of weak soil can be achieved through different methods, some of which include jet column, cement stabilization and fly ash stabilization. Unfortunately, the use of the aforementioned methods of soil improvement affects the environment negatively thereby leading to environmental degradation. With the aforesaid impediment in mind, the need for devising methods of weak soil improvement becomes pertinent. Methods Bacillus sp. — a non-pathogenic organism found abundantly in soil — was investigated in this study as a potential agent of soil improvement. The usability of Bacillus sp. in soil improvement was investigated with direct shear tests and permeability tests under optimum conditions in this study. Result Time-dependent study on the effect of the ureolytic bacteria Bacillus sp.-induced calcium carbonate precipitation shows reduction in permeability and increase in the strength of the soil under study. On exhaustion of the available nutrients in the soil, however, the strength of the soil is not negatively impacted. Conclusion Microbially induced calcium precipitation by Bacillus sp. is effective in soil improvement as such it may serve as substitute for conventional soil stabilization techniques. The ability of the bacteria to precipitate calcium carbonate in the soil leads to reduction in the permeability and increase in the shear strength of the soil.

【 授权许可】

Unknown