Role of Na-Montmorillonite on Microbially Induced Calcium Carbonate Precipitation

Tang, Guowang; Jia, Cangqin; Wang, Guihe; Yu, Panxi; Zhang, Haonan

doi:10.3390/molecules26206211

Cited by 3 publications

(2 citation statements)

References 54 publications

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“…MMT, which has excellent adsorption capacity, adsorbs these bacterial cells and promotes CaCO 3 nucleation and mineral crystal growth. This mechanism has been demonstrated in a previous experiment conducted by Tang et al (2021) [22]. In addition, the biofilm produced by the microorganisms interacted with MMT to form an organo-clay, leading to net contraction along the 001 lattice plane of MMT.…”

Section: Combination Of Mmt and Micp For The Stabilization Of Sandy Soilsupporting

confidence: 57%

“…In addition, when 6% of MMT was added to the uranium tailings, the maximum strength of the cement body reached 2.18 MPa, representing an increase of 47.66% when compared with its absence. Recently, Tang et al (2021) reported the effects of the addition of Na-MMT to an MICP process on the precipitated minerals and soil mechanical properties [22]. The addition of Na-MMT accelerated the Ca 2+ ion reaction and led to higher levels of CaCO 3 .…”

Section: Introductionmentioning

confidence: 99%

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Microbial Precipitation of Calcium Carbonate for Crack Healing and Stabilization of Sandy Soils

Kim,

Roh

2024

Applied Sciences

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Microbially induced calcium carbonate (CaCO3) precipitation (MICP) can improve the shear strength of soil via biocementation while reducing its porosity and hydraulic conductivity. The purpose of this study was to evaluate the effect of the addition of bacterial metabolites and montmorillonite on the crack healing and biocementation of sandy soil during the MICP process. Cracks were generated by drying wet soil samples in Petri dishes, after which they were sprayed with one of four treatments: deionized water, a cementation solution, bacteria mixed with the cementation solution, and bacterial metabolites mixed with the cementation solution. After five cycles of this spray treatment, the surface crack ratio was observed to decrease by about 71% when living cells were used and by about 80% when microbial metabolites were added. However, the crack reduction ratio was relatively low when treated with water (28%) and the cementation solution alone (48%). To investigate the effect of adding a phyllosilicate to improve the strength of sandy soil, MICP was induced in sand mixed with 0–30% montmorillonite (MMT). As a result, the soil strength increased with higher levels of MMT, indicating that MMT contributed to soil stabilization as a colloid for CaCO3 precipitation and via adhesion between sand grains. Therefore, for the crack healing and stabilization of sandy soil, the addition of bacterial metabolites and montmorillonite may enhance the effectiveness of the MICP process.

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Section: Combination Of Mmt and Micp For The Stabilization Of Sandy Soilsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Microbial Precipitation of Calcium Carbonate for Crack Healing and Stabilization of Sandy Soils

Kim,

Roh

2024

Applied Sciences

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The effect of different additives on bacteria adsorption, compressive strength and ammonia removal for MICP

Hanisch,

Pechtl,

Maurer

et al. 2024

Environ Earth Sci

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Microbial induced calcite precipitation is a commonly used technique for the application of biocementation. The metabolism of urea by ureolytic active bacteria leads, among other metabolic products such as ammonium, to carbonate ions. In the presence of calcium ions, calcium carbonate formation occurs. It was investigated whether the addition of different additives (Ca-bentonite, Na-bentonite, clinoptilolite, natrolite, limestone, marl clay, concresol, secursol, and activated carbon powder) can optimize this process. First, the influence of these additives on the adsorption rates and distribution of the ureolytic active organism Sporosarcina pasteurii in quartz sand columns was tested. Moreover, an investigation was conducted on the impact of various additives on ammonium immobilization to mitigate its leaching from soils subjected to the biocementation process. For eight additives uniaxial compressive strength tests in quartz sand columns and a storage method according to DIN EN 12390–2 were carried out. Each additive showed a characteristic adsorption and localisation progression. Furthermore, each additive was able to enhance the immobilization behavior of the present ammonium, with a maximum immobilization capacity of 10.76 $$\frac{mg (NH^+_4)}{g (additive)}$$ m g ( N H 4 + ) g ( a d d i t i v e ) . The uniaxial compressive strength of biocemented columns out of quartz sand could sectionally be increased by the addition of each additive. However, the storage methodology shows a much greater influence on column strength. Overall, the best results were achieved with the two additives, Ca-bentonite and clinoptilolite, resulting in strength increases in sand columns of up to 4.64 and 3.22 $$\frac{N}{mm^2}$$ N m m 2 , respectively.

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Effect of (in)organic additives on microbially induced calcium carbonate precipitation

Haystead,

Gilmour,

Sherry

et al. 2023

Journal of Applied Microbiology

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Aim This study aimed to understand the morphological effects of (in)organic additives on microbially induced calcium carbonate precipitation (MICP). Methods and results MICP was monitored in real-time in the presence of (in)organic additives: bovine serum albumin (BSA), biofilm surface layer protein A (BslA), magnesium chloride (MgCl2) and poly-L-lysine. This monitoring was carried out using confocal microscopy to observe the formation of CaCO3 from the point of nucleation, in comparison to conditions without additives. Complementary methodologies, namely scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction, were employed to assess the visual morphology, elemental composition, and crystalline structures of CaCO3, respectively, following the crystals’ formation. The results demonstrated that in the presence of additives, more CaCO3 crystals were produced at 100 minutes compared to the reaction without additives. The inclusion of BslA resulted in larger crystals than reactions containing other additives, including MgCl2. BSA induced a significant number of crystals from the early stages of the reaction (20 minutes) but did not have a substantial impact on crystal size compared to conditions without additives. All additives led to a higher content of calcite compared to vaterite after a 24-hour reaction, with the exception of MgCl2, which produced a substantial quantity of magnesium calcite. Conclusions The work demonstrates the effect of several (in)organic additives on MICP and sets the stage for further research to understand additive effects on MICP to achieve controlled CaCO3 precipitation.

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Role of Na-Montmorillonite on Microbially Induced Calcium Carbonate Precipitation

Cited by 3 publications

References 54 publications

Microbial Precipitation of Calcium Carbonate for Crack Healing and Stabilization of Sandy Soils

Microbial Precipitation of Calcium Carbonate for Crack Healing and Stabilization of Sandy Soils

The effect of different additives on bacteria adsorption, compressive strength and ammonia removal for MICP

Effect of (in)organic additives on microbially induced calcium carbonate precipitation

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