Soil Improvement Using Microbial: A Review

Wath, R. B.; Pusadkar, S. S.

doi:10.1007/978-981-13-0559-7_37

Cited by 8 publications

(8 citation statements)

References 10 publications

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“…Noteworthy, Bibi et al (2018) reported that higher bacterial cell growth may not correspond to higher urease activity which does not necessarily translate to higher CaCO 3 yield. Rather, higher urease activity and the isolate potential to sustain and survive at a higher alkaline pH, other than bacterial growth are the basic parameters favouring the fundamental success of the MICP application process towards soil biostabilization (Wath & Pusadkar 2016;Bibi et al 2018). Based on the aforementioned basic factors (urease activity and pH), isolate O6w and O3a were favoured as the bacterial candidates that sustained the optimum conditions correct for calcium carbonate precipitation activity towards biotreatment of problematic soils.…”

Section: Quantification Of Urease Activitymentioning

confidence: 99%

Assessing Indigenous Soil Ureolytic Bacteria as Potential Agents for Soil Stabilization

Aliyu

Mustafa²,

Aziz³

et al. 2023

J.Tropical Biodiversity Biotechnology

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Microbially induced carbonate precipitation by ureolysis is a biomineralization process that has been adapted by various microorganisms in different natural environments. This widespread natural phenomenon can be employed in numerous civil engineering and soil stabilization applications. In the present study, the potential of indigenous soil urease-producing bacteria as potential agents for soil stabilization methods was investigated. Assessment of the eight active urease-producing bacterial species isolated from the farm soil samples has demonstrated that all the isolates were Gram-positive rod-shaped bacteria with promising characteristics such as the formation of endospore which is essential for bacterial survival in harsh conditions within the soil environment. The pH profile and growth profile of the isolates were studied and urease activity was measured by the phenol hypochlorite assay method. Two isolates designated isolate O6w and isolate O3a were selected based on the highest urease activity recorded at 665 U/mL and 620 U/mL, respectively, and they were able to increase and sustain alkaline culture condition (pH 8.71 ± 0.01 and 8.55 ± 0.01) which was suitable for CaCO3 precipitation. The isolates were identified based on 16S ribosomal RNA sequencing to be Bacillus cereus (O6w) and Bacillus paramycoides (O3a). This current study suggested that indigenous soil ureolytic bacteria are potential raw material for the biotreatment of soils stability.

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Section: Quantification Of Urease Activitymentioning

confidence: 99%

Assessing Indigenous Soil Ureolytic Bacteria as Potential Agents for Soil Stabilization

Aliyu

Mustafa²,

Aziz³

et al. 2023

J.Tropical Biodiversity Biotechnology

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“…Microbial precipitation of calcium carbonate has proven its potential as a microbial geotechnologybased method that is adapted for soil improvement. It is applied for various soil improvement projects such as controlling erosion in rivers and coastal areas, enhancing the stability of non-piled and piled foundations, treating pavement surface, decreasing dust levels on exposed surfaces by binding together the dust particles, reinforcing soil for the enhancement of underground constructions (Wath & Pusadkar, 2016). There were several reports (Burbank et al, 2011;Jiang et al, 2016;Fujita et al, 2017;Krajewska 2018) that had drawn our attention to the possibility of stimulating in situ soil urease positive bacteria in natural soils.…”

Section: Soil and Sand Improvement Via Micpmentioning

confidence: 99%

Microbial-Induced Calcite Precipitation: A Milestone Towards Soil Improvement

Dardau

Mustafa

Aziz

2021

MABJ

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Microbial-induced calcite precipitation (MICP) is a natural process that offered various applications in the engineering field materials and construction industry. It has recently emerged as an innovative, eco-friendly, and economically engineeredprocess. One of the successful MICP methods of improving the engineering properties of soils is ureolysis. The ureolysis drove the process of precipitate calcite which binds soil particles within the soil matrix thus enhance soil characteristicssuch as stiffness, permeability, hydraulic conductivity, shear strength, and compressive strength. This paper aimed at reviewing the concept of utilizing calcium carbonate (CaCO3) precipitation by ureolytic bacteria towards the improvement of soil and sand engineering properties for various geotechnical applications. The potential applications of this technologyin soil erosion, stability, and reinforcement were discussed. Detail overviews of the temperature, pH, bacteria cell concentration, nutrients, types of bacteria, and concentration of reactants that affect the efficiency of the process are also reviewed. This review demonstrated the potential of the MICP technology from the laboratory to a field-scale or commercial applications.

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“…As a new type of foundation treatment technology, microbial grouting reinforcement has promoted advances in the field of soil strength solidification and modification [ 25 , 26 ]. However, few relevant studies have examined the seismic dynamic characteristics and response of saturated sand, and centrifuge shaking table model tests of microbial treatment of a liquefied sand foundation have rarely been reported.…”

Section: Introductionmentioning

confidence: 99%

Spatial Distribution Characteristics of Microbial Mineralization in Saturated Sand Centrifuge Shaking Table Test

2022

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Calcium carbonate induced by microorganisms can quickly fill and cement sand particles, thereby effectively reducing the potential for the liquefaction of sand. This process could represent a new green approach to the liquefaction treatment of saturated sand and has good prospects for application. However, owing to the diversity of microbial activities and the heterogenous spatiotemporal distribution of bacterial nutrient seepage in sandy soil foundations, the resultant complex distribution of calcium carbonate deposition in a sandy soil foundation can lead to differences in solidification strength and improvement effect. To understand the influence of earthquake action on the liquefaction resistance of saturated sand treated by microorganisms, and to evaluate the effect of microbial technology on sand liquefaction prevention under dynamic load, this study simulated the dynamic stress conditions of saturated sand under shear waves, using the world′s first centrifuge shaking table (R500B), which realizes horizontal and vertical two-way vibration. On the basis of spatial heterogeneity of microbial mineralization after centrifuge shaking table tests, the effect of microbial strengthening on liquefied sand was analyzed, and the spatial distribution of calcium carbonate mineralization was examined. The results showed that the distribution of microorganisms in the solidified soil exhibited obvious spatial heterogeneity with a significant edge effect. Although microbial mineralization effectively improved the liquefaction resistance of saturated sand, a sudden change in the process of calcium carbonate deposition altered the cementation of the sand with depth. Moreover, the curing strength had obvious complexity and uncertainty that directly affected the shear stiffness of the soil under dynamic load, and this constitutes one of the reasons for the degradation of shear stiffness of sand during liquefaction. The derived conclusions could be used as a reference for engineering applications of microbial treatment of a liquefiable sandy soil foundation.

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Soil Improvement Using Microbial: A Review

Cited by 8 publications

References 10 publications

Assessing Indigenous Soil Ureolytic Bacteria as Potential Agents for Soil Stabilization

Assessing Indigenous Soil Ureolytic Bacteria as Potential Agents for Soil Stabilization

Microbial-Induced Calcite Precipitation: A Milestone Towards Soil Improvement

Spatial Distribution Characteristics of Microbial Mineralization in Saturated Sand Centrifuge Shaking Table Test

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