State-of-the-art review of soil erosion control by MICP and EICP techniques: Problems, applications, and prospects

Wang, Yong; Sun, Xiaohao; Miao, Linchang; Wang, Hengxing; Wu, Linyu; Shi, Wenbo; Kawasaki, Satoru

doi:10.1016/j.scitotenv.2023.169016

Cited by 8 publications

(5 citation statements)

References 166 publications

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“…Certain strains may exhibit high urease activity yet fall short in calcium carbonate precipitation proficiency, while others display lower urease activity but excel in precipitate formation. By collaborating, these bacterial strains achieve more efficient conversion of urea into ammonia, producing superior amounts of calcium carbonate precipitates (Zhu and Dittrich 2016 ; Wang et al 2024b ; He et al 2023 ) and allowing precipitation to occur effectively across various environmental conditions. This cooperative action transforms into accelerated urea hydrolysis and ammonia production, promoting the formation of calcium carbonate crystals within the soil matrix.…”

Section: Introductionmentioning

confidence: 99%

“…The biocementation process can also be manipulated to meet specific project requirements by adjusting microbial strains to environmental conditions. In slope stabilization, MICP-treated soils exhibit increased shear strength and reduced erosion susceptibility, mitigating the risk of landslides and slope failures (Wang et al 2024b ; Hang et al 2023 ). Furthermore, MICP enhances the load-bearing capacity of foundations by reinforcing soil matrices and reducing settlement, thereby improving the stability and longevity of structures (Sun et al 2024 ).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, MICP enhances the load-bearing capacity of foundations by reinforcing soil matrices and reducing settlement, thereby improving the stability and longevity of structures (Sun et al 2024 ). Additionally, MICP contributes to soil erosion control by cementing soil particles and enhancing cohesion, preventing erosion and sediment runoff (Wang et al 2024b ; Gitanjali et al 2024 ). These practical applications underscore the tangible benefits of MICP in real-world geotechnical engineering projects.…”

Section: Introductionmentioning

confidence: 99%

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Synergistic biocementation: harnessing Comamonas and Bacillus ureolytic bacteria for enhanced sand stabilization

Rajasekar,

Zhao,

et al. 2024

World J Microbiol Biotechnol

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Biocementation, driven by ureolytic bacteria and their biochemical activities, has evolved as a powerful technology for soil stabilization, crack repair, and bioremediation. Ureolytic bacteria play a crucial role in calcium carbonate precipitation through their enzymatic activity, hydrolyzing urea to produce carbonate ions and elevate pH, thus creating favorable conditions for the precipitation of calcium carbonate. While extensive research has explored the ability of ureolytic bacteria isolated from natural environments or culture conditions, bacterial synergy is often unexplored or under-reported. In this study, we isolated bacterial strains from the local eutrophic river canal and evaluated their suitability for precipitating calcium carbonate polymorphs. We identified two distinct bacterial isolates with superior urea degradation ability (conductivity method) using partial 16 S rRNA gene sequencing. Molecular identification revealed that they belong to the Comamonas and Bacillus genera. Urea degradation analysis was performed under diverse pH (6,7 and 8) and temperature (15 °C,20 °C,25 °C and 30 °C) ranges, indicating that their ideal pH is 7 and temperature is 30 °C since 95% of the urea was degraded within 96 h. In addition, we investigated these strains individually and in combination, assessing their microbially induced carbonate precipitation (MICP) in silicate fine sand under low (14 ± 0.6 °C) and ideal temperature 30 °C conditions, aiming to optimize bio-mediated soil enhancement. Results indicated that 30 °C was the ideal temperature, and combining bacteria resulted in significant (p ≤ 0.001) superior carbonate precipitation (14–16%) and permeability (> 10− 6 m/s) in comparison to the average range of individual strains. These findings provide valuable insights into the potential of combining ureolytic bacteria for future MICP research on field applications including soil erosion mitigation, soil stabilization, ground improvement, and heavy metal remediation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synergistic biocementation: harnessing Comamonas and Bacillus ureolytic bacteria for enhanced sand stabilization

Rajasekar,

Zhao,

et al. 2024

World J Microbiol Biotechnol

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“…There are mainly four methods for the MICP reinforcement of soil: spraying method [14,38], grouting method, prefabricated vertical drain (PVD), and shallow trenches [24]. The spraying method is suitable for the shallow reinforcement of large area.…”

Section: Comparison Of Reinforcement Methods For Micp Applicationsmentioning

confidence: 99%

A Substitute for Portland Cement: Experiments on Ecofriendly Reinforcement of Large-Scale Calcareous Sand by Microbial-Induced Carbonate Precipitation Spraying Method

Li,

Rui,

et al. 2023

Sustainability

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In order to respond to the greenhouse effect and achieve sustainable development, microbial-induced carbonate precipitation (MICP) technology based on the spraying method was used as a substitute for Portland cement to reinforce calcareous sand. In order to simulate the tide and determine the suitable concentration, the effects of the initial water level and cementing solution (CS) concentration on the reinforcement were analyzed. The results showed that the distributions of penetration resistance and equivalent calcium carbonate content mainly include two patterns: monotonically decreasing, and initially increasing and then decreasing. The fully saturated case only showed a dense, thin layer of calcium carbonate on the surface, and in the completely dry case, middle cementation was produced. When the initial water level was 0.5 m, the largest range of 60 cm of effective cementation appeared, and both the equivalent calcium carbonate content and penetration resistance were the highest because the microorganisms were more likely to migrate to the particle connection. The calcium carbonate generated by the MICP reaction played a role in increasing the water retention capacity of the sand. As the degree of cementation increased, the SWRC gradually moved up and the matrix suction corresponding to the same volume water content increased sequentially. Increasing the spraying times and the concentration of CS generated more calcium carbonate. The penetration resistance of higher CS concentrations was larger with the same calcium carbonate content. There was a linear relationship between the normalized penetration resistance and the normalized shear wave velocity.

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“…Consequently, Enzyme-Induced Carbonate Precipitation (EICP) technology, which utilizes plant urease to trigger calcium carbonate precipitation, has experienced rapid advancement [13]. Plant-derived urease breaks down urea to produce carbonate ions, which, in combination with substances like urea and calcium chloride, create carbonate precipitates to mineralize heavy metals [14]. The hardness and permeability coefficient of farmland soil are crucial factors in crop growth and development.…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study of Applying Enzyme-Induced Carbonate Precipitation (EICP) without Calcium Source for Remediation of Lead-Contaminated Loess

Zhang,

Zhang

2024

Buildings

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To assess the long-term stability of lead-contaminated loess treated with calcium-free Enzyme-Induced Carbonate Precipitation (EICP) technology while avoiding significant soil strength increases, various parameters such as the pH value, heavy metal ion leaching rate, and soil heavy metal speciation were evaluated. This study investigated the remediated soil’s stability under complex environmental conditions, including dry–wet cycles and acid rain leaching. The intrinsic mechanisms were elucidated through the Zeta potential, scanning electron microscopy (SEM), and X-ray diffraction (XRD) analyses. The results showed that compared to the untreated lead-contaminated loess, the surface strength of the loess treated with EICP technology increased by 3.86 times, with a 1.47-fold increase observed with the calcium-free EICP treatment. Carbonate precipitation improved the erosion resistance by adsorbing or coating fine particles and forming bridging connections with coarse particles. As the number of dry–wet cycles increased, the soil pH gradually decreased but remained above 8.25. The heavy metal leaching rate increased with the leaching cycles until reaching a plateau. The acid rain influence showed a decrease in the Pb2+ content in the leachate as the acid rain solution pH increased, meeting hazardous waste disposal regulations. These findings offer new insights for improving heavy metal-contaminated loess site remediation and understanding the underlying geochemical mechanisms.

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State-of-the-art review of soil erosion control by MICP and EICP techniques: Problems, applications, and prospects

Cited by 8 publications

References 166 publications

Synergistic biocementation: harnessing Comamonas and Bacillus ureolytic bacteria for enhanced sand stabilization

Synergistic biocementation: harnessing Comamonas and Bacillus ureolytic bacteria for enhanced sand stabilization

A Substitute for Portland Cement: Experiments on Ecofriendly Reinforcement of Large-Scale Calcareous Sand by Microbial-Induced Carbonate Precipitation Spraying Method

Feasibility Study of Applying Enzyme-Induced Carbonate Precipitation (EICP) without Calcium Source for Remediation of Lead-Contaminated Loess

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