Using Electric Field to Improve the Effect of Microbial-Induced Carbonate Precipitation

Jinxiang Deng, Mengjie Li, Yakun Tian, Zhijun Zhang (), Lingling Wu () and Lin Hu
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Jinxiang Deng: School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China
Mengjie Li: School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China
Yakun Tian: School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China
Zhijun Zhang: School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China
Lingling Wu: School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China
Lin Hu: School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China

Sustainability, 2023, vol. 15, issue 7, 1-22

Abstract: The precipitation of calcium carbonate induced by Sporosarcina pasteurii ( S. pasteurii ) has garnered considerable attention as a novel rock and soil reinforcement technique. The content and structure of calcium carbonate produced through this reaction play a crucial role in determining the rocks’ and soil’s reinforcement effects in the later stages. Different potential gradients were introduced during the bacterial culture process to enhance the performance of the cementation and mineralization reactions of the bacterial solution to investigate the effects of electrification on the physical and chemical characteristics, such as the growth and reproduction of S. pasteurii . The results demonstrate that the concentration, activity, and number of viable bacteria of S. pasteurii were substantially enhanced under an electric field, particularly the weak electric field generated by 0.5 V/cm. The increased number of bacteria provides more nucleation sites for calcium carbonate deposition. Moreover, as the urease activity increased, the calcium carbonate content generated under an electric potential gradient of 0.5 V/cm surpassed that of other potential gradient groups. The growth rate increased by 9.78% compared to the calcium carbonate induced without electrification. Significantly, the suitable electric field enhances the crystal morphology of calcium carbonate and augments its quantity, thereby offering a novel approach for utilizing MICP in enhancing soil strength, controlling water pollution, and mitigating seepage. These findings elevate the applicability of microbial mineralization in engineering practices.

Keywords: microbial biomineralization; Sporosarcina pasteurii; potential gradient; calcium carbonate (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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