Experimental Study on MICP Technology for Strengthening Tail Sand under a Seepage Field

Zhang, Zhijun; Li, Biao; Hu, Lin; Zheng, Huaimiao; He, Guicheng; Yu, Qin; Wu, Lingling

doi:10.1155/2020/8819326

Cited by 7 publications

(2 citation statements)

References 13 publications

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“…The results indicated that the numerical model could estimate the permeability after MICP treatment. Zhang et al [11] conducted an experimental comparison of MICP tailings reinforcement technology affected by the seepage field and unaffected by the seepage field. It was discovered that under the influence of the seepage field, the total pores were comparatively reduced, the shear strength was lowered, and the distribution of calcium carbonate was more irregular.…”

Section: Introductionmentioning

confidence: 99%

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

Deng

Tian

et al. 2023

Sustainability

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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.

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Section: Introductionmentioning

confidence: 99%

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

Deng

Tian

et al. 2023

Sustainability

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“…Bioremediation technologies have been increasingly studied as low-cost remediation strategies for mining effluent (Praharaj and Fortin 2008;Skousen et al 2017). An emerging technology that could serve as a viable method in the stabilization of TSFs is microbial-induced calcite precipitation (MICP) (Lai et al 2020;Tamayo-Figueroa et al 2019;Zhang et al 2020). This process involves bacterial species that possess an ureolytic enzymatic pathway, which is responsible for hydrolyzing urea (CO(NH 2 )) into carbonate and ammonium (Eq.…”

Section: Introductionmentioning

confidence: 99%

Pilot-scale feasibility study for the stabilization of coal tailings via microbially induced calcite precipitation

Rodin

Champagne

Mann

2022

Environ Sci Pollut Res

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Sustainable long-term solutions to managing tailings storage facilities (TSFs) are integral for mines to operate in a safe and environmentally responsible manner. The long-term storage of subaqueous tailings can pose significant safety, environmental, and economic risks; therefore, alternative containment strategies for maintaining geochemical stability of reactive materials must be explored. In this study, the physical and geochemical stabilization of coal tailings using microbially induced calcite precipitation (MICP) was evaluated at a laboratory pilot scale. Three application techniques simulated commonly used agricultural approaches and equipment that could be deployed for field-scale treatment: spraying on treatment solutions with irrigation sprinklers, mixing tailings and treatment solutions with a rototiller, and distributing treatment solutions via shallow trenches using an excavator ripper. Test cells containing 1.0 × 1.0 × 0.5 m of tailings were treated with ureolytic bacteria (Sporosarcina pasteurii) and cementation solutions composed of urea and calcium chloride for 28 days. Penetrometer tests were performed following incubation to evaluate the extent of cementation. The spray-on application method showed the greatest strength improvement, with in an increase in surface strength of more than 50% for the 28-day testing period. The distribution of treatment solution using trenches was found to be less effective and resulted in greater variability in particle size distribution of treated tailings and would not be recommended for use in the field. The use of rototilling equipment provided a homogenous distribution of treatment solution; however, the disruption to the tailings material was less effective for facilitating effective cementation. Bacterial plate counts of soil samples indicated that S. pasteurii cultures remained viable in a tailings environment for 28 days at 18 °C and near-neutral pH. The treatment was also found to stabilize the pH of tailings porewater sampled over the 28-day incubation period, suggesting the potential for the treatment to provide short-term geochemical stability under unsaturated conditions.

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Stabilization/solidification of mining waste via biocementation

Mwandira

Nakashima

Kawasaki

2022

Low Carbon Stabilization and Solidification of Hazardous Wastes

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Experimental Study on MICP Technology for Strengthening Tail Sand under a Seepage Field

Cited by 7 publications

References 13 publications

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

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

Pilot-scale feasibility study for the stabilization of coal tailings via microbially induced calcite precipitation

Stabilization/solidification of mining waste via biocementation

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