Optimization of growth medium for microbially induced calcium carbonate precipitation (MICP) treatment of desert sand

Dagliya, Monika; Satyam, Neelima; Garg, Ankit

doi:10.1007/s40333-023-0018-3

Cited by 14 publications

(4 citation statements)

References 36 publications

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“…This has implications for the shrinkage rate of clay aggregates due to heavy metal leaching through infiltration. Similar effects have been observed in other heavy metal-contaminated soils, corroborating the broader relevance of the study's findings [32,44,45]. Zeta potential analysis can be used to evaluate the thickness of the double layer, with positive values in the loess indicating the entry of Ca 2+ and Zn 2+ into the Stern layer through electrostatic attraction, leading to a change in Zeta potential sign (see Figure 10) [48,51].…”

Section: Ddl Effectsupporting

confidence: 81%

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Feasibility of Microbially Induced Carbonate Precipitation to Enhance the Internal Stability of Loess under Zn-Contaminated Seepage Conditions

He,

Guo,

Zhang

2024

Buildings

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Loess is widely distributed in Northwestern China and serves as the preferred engineering construction material for anti-fouling barriers. Heavy metal contamination in soil presents significant challenges to the engineering safety of vulnerable loess structures. Hence, there is an urgent need to investigate the impact of heavy metal ions on their percolation performance. In order to investigate the effectiveness of microbially induced carbonate precipitation (MICP) using Sporosarcina pasturii (CGMCC1.3687) bacteria in reducing internal seepage erosion, a saturated permeability test was conducted on reshaped loess under constant water head saturation conditions. The response of loess to deionized water (DW) and ZnCl2 solution seepages was analyzed by monitoring changes in cation concentration over time, measuring Zeta potential, and using scanning electron microscopy (SEM). The results indicate that the hydrolysis of Zn2+ creates an acidic environment, leading to the dissolution of carbonate minerals in the loess, which enhances its permeability. The adsorption of Zn2+ ions and the resulting diffusion double-layer (DDL) effect reduce the thickness of the diffusion layer and increase the number of free water channels. Additionally, the permeability of loess exposed to ZnCl2 solution seepage significantly increased by 554.5% compared to loess exposed to deionized water (DW) seepage. Following the seepage of ZnCl2 solutions, changes in micropore area ratio were observed, decreasing by 48.80%, while mesopore areas increased by 23.9%. MICP treatment helps reduce erosion and volume shrinkage in contaminated loess. Carbonate precipitation enhances the erosion resistance of contaminated loess by absorbing or coating fine particles and creating bridging connections with coarse particles. These research results offer new perspectives on enhancing the seepage properties of saturated loess in the presence of heavy metal erosion and the geochemical mechanisms involved.

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Section: Ddl Effectsupporting

confidence: 81%

“…MICP technology effectively combines fine soil particles with coarse particles to reduce erosion potential under seepage [31,32]. It maintains the permeability of the existing soil, preventing significant changes in pore pressure in upstream and downstream areas, thereby enhancing the overall stability of antifouling barriers.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of Microbially Induced Carbonate Precipitation to Enhance the Internal Stability of Loess under Zn-Contaminated Seepage Conditions

He,

Guo,

Zhang

2024

Buildings

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“…explored the impact of naturally present bacteria in the soil to stabilize swelling behaviour and enhancing strength of expansive soil. MICP performance is impacted by various factors, including the type of bacteria (Sharma et al, 2021a), concentrations of bacterial cells (Wen et al, 2020), cementation solution (Dagliya et al, 2023), bacterial spatial distribution within biotreated soil, the pH and the soil temperature (Zhao et al, 2014). DeJong et al (2006) conducted an experiment where S. pasteurii was injected into a soil column, resulting in a 3.5 times strength increase compared to untreated soil.…”

Section: Introductionmentioning

confidence: 99%

Effect of fibre‐reinforced microbial‐induced calcite precipitation on the mechanical properties of coastal soil

Rawat,

Satyam

2024

Soil Use and Management

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Coastal erosion is a global environmental concern, threatening infrastructure, human livelihoods and ecosystems. Recently, microbial‐induced calcite precipitation (MICP) has emerged as a promising ground improvement technique. The present study examined the effects of adding three different fibre reinforcements, namely carbon, basalt and polypropylene, on the physical and mechanical properties of coastal soil through MICP. The fibre content used was 0.20%, 0.40% and 0.60% of soil weight. A comprehensive biotreatment investigation was conducted using Sporosarcina pasteurii (S. pasteurii) in a 0.5 molar cementation solution. The samples prepared for this study had aspect ratios of 2:1 and 1:1. These samples were subjected to biotreatment, consisting of a 24‐h cycle for 9 and 18 days. Unconfined compressive strength (UCS), split tensile strength (STS) and ultrasonic pulse velocity (UPV) tests were conducted on the biotreated samples to evaluate the effect of fibre reinforcement on the mechanical properties of the biotreated samples. The amount of calcite precipitation, scanning electron microscope (SEM) and energy dispersive X‐ray spectroscopy (EDS) were used to interpret biocementation. Results suggest that adding fibres to the MICP process enhances the mechanical properties of coastal soil. The optimum fibre content for carbon and basalt fibre was 0.40%, whereas, for polypropylene, it stood at 0.20%. The maximum UCS, STS, UPV and average CaCO3 were observed in a basalt fibre‐reinforced biotreated sample with a fibre content of 0.40%, subjected to 18‐day biotreatment. Conversely, the sample without fibre‐reinforcement, biotreated for 9 days, exhibited the lowest values for these parameters. Samples subjected to 18 days of treatment have higher values of UCS, STS, UPV and CaCO3 content than 9‐day‐treated soil samples. SEM revealed the presence of CaCO3 precipitates on the surfaces of soil grains and their contact points, and the EDS spectrum corroborated this observation.

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“…Stress-strain behaviour of MICP treatments has been explored by Cabalar et al (2018) and DeJong et al (2006), through triaxial shear testing, showing that strength increases as calcite precipitation increases. The use of standard laboratory-grade reagents, the culture process for bacteria and the production of urease all undergo CaCO 3 precipitation , which makes it uneconomical for field-scale applications (Dagliya et al, 2023a), though costs can be reduced by using commercially available substances on a large scale (Omoregie et al, 2019). However, it has been found that despite their many advantages, MICP and EICP still have shortcomings.…”

Section: Introductionmentioning

confidence: 99%

Rock‐like strength enhancement of Indian desert sand using commercially available polysaccharide biopolymers

Dagliya,

Satyam,

Garg

2023

Soil Use and Management

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Biopolymers are a nature‐friendly solution that can impart rock‐like strength in sand by developing bonds between grains. In this study, we assessed the behaviour of desert sand treated with commercially available pectin (P), acacia gum (AG), and sodium alginate (SA) polysaccharide biopolymers (1 %, 2 %, and 3 % concentration) applied at 0.75 or 1 pore volume (PV). Non‐destructive ultrasonic pulse velocity (UPV) tests recorded maximum values of 1579 m/s for acacia gum samples, 1490 m/s for sodium alginate samples, and 1400 m/s for pectin samples, all showing rock‐like behaviour. Unconfined compressive strength (UCS) and split tensile strength (STS) tests showed that the strength level generally increased with biopolymer concentration. The minimum UCS value was 173 kPa for the Pectin (1%) 0.75 PV composition, and the maximum was 1287 kPa for the acacia gum (2%) 0.75 PV composition. The UCS value for the acacia gum (1%) 0.75 PV was 1178 kPa, with optimal results compared to other compositions. Scanning electron microscopy (SEM), energy dispersive X‐ray spectroscopy (EDX), and X‐ray diffraction (XRD) tests were performed for microstructural analysis. SEM revealed a strong bond between sand particles and biopolymers. EDX and XRD showed that the strength stemmed from gel formation in the pores, rather than mineralogical changes. The study results indicate the level of strength attained with varying biopolymer percentages and pore volumes and is useful for desert sand stabilization.

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Optimization of growth medium for microbially induced calcium carbonate precipitation (MICP) treatment of desert sand

Cited by 14 publications

References 36 publications

Feasibility of Microbially Induced Carbonate Precipitation to Enhance the Internal Stability of Loess under Zn-Contaminated Seepage Conditions

Feasibility of Microbially Induced Carbonate Precipitation to Enhance the Internal Stability of Loess under Zn-Contaminated Seepage Conditions

Effect of fibre‐reinforced microbial‐induced calcite precipitation on the mechanical properties of coastal soil

Rock‐like strength enhancement of Indian desert sand using commercially available polysaccharide biopolymers

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