Effect of microbial-induced calcite precipitation on shear strength of gold mine tailings

Behzadipour, Hamed; Sadrekarimi, Abouzar

doi:10.1007/s10064-023-03357-3

Cited by 8 publications

(4 citation statements)

References 111 publications

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“…While many studies on the engineering applications of MICP use a basic urea-calcium source medium to achieve biocementation via ureolysis, a small number of studies have also included additional substrates such as ammonium chloride in the cementation medium [8,[19][20][21][22][23][24][25]. There is, however, a lack of clarity in terms of the effects of this augmentation of the basic urea-calcium medium and hence a lack of justification for the use of additional substrates such as ammonium chloride.…”

Section: Co(nhmentioning

confidence: 99%

“…Overall, there is greater homogeneity in the calcium carbonate distribution when using the augmented medium (columns 4 to 6). Behzadipour and Sadrekarimi [24] reported that they used ammonium chloride within the cementation medium to lower the CaCO3 precipitation rate and prevent the early clogging of pores, and thus promote more uniform precipitation. While the aforementioned study did not evidence this effect of using ammonium chloride, the results presented in Figure 14 potentially support this Figure 14 shows the distribution of the Calcimeter measured calcium carbonate content at the base, middle and top of columns, as a percentage of the total measured mass per column.…”

Section: Unconfined Compressive Strengthmentioning

confidence: 99%

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Increased Microbially Induced Calcium Carbonate Precipitation (MICP) Efficiency in Multiple Treatment Sand Biocementation Processes by Augmentation of Cementation Medium with Ammonium Chloride

Spencer,

Sass,

van Paassen

2023

Geotechnics

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The cementation medium for ureolytic microbially induced calcium carbonate precipitation (MICP) typically consists of urea and a calcium source. While some studies have augmented this basic medium, the effects of adding substrates such as ammonium chloride are unclear. The studies detailed in this paper sought to quantify the effect of the ammonium chloride augmentation of cementation medium (CM) on the process of MICP. An aqueous MICP study was initially carried out to study the effects of adding ammonium chloride to the urea–calcium cementation medium. This batch test also explored the effect of varying the concentration of calcium chloride dihydrate (calcium source) in the CM. A subsequent sand column study was undertaken, whereby multiple treatments of CM were injected over several days to produce a biocement. Six columns were prepared using F65 sand bioaugmented with Sporosarcina pasteurii, half of which were injected with the basic medium only and half with the augmented medium for treatment two onwards. Effluent displaced from columns was tested using ion chromatography and Nesslerisation to determine the calcium and ammonium ion concentrations, respectively, and hence the treatment efficiency. Conductivity and pH testing of effluent gave insights into the bacterial urease activity. The addition of 0.187 M ammonium chloride to the CM resulted in approximately 100% chemical conversion efficiency within columns, based on calcium ion measurements, compared to only 57% and 33% efficiency for treatments three and four, respectively, when using the urea–calcium medium. Columns treated with the CM containing ammonium chloride had unconfined compressive strengths which were 1.8 times higher on average than columns treated with the urea–calcium medium only.

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Section: Co(nhmentioning

confidence: 99%

Section: Unconfined Compressive Strengthmentioning

confidence: 99%

Increased Microbially Induced Calcium Carbonate Precipitation (MICP) Efficiency in Multiple Treatment Sand Biocementation Processes by Augmentation of Cementation Medium with Ammonium Chloride

Spencer,

Sass,

van Paassen

2023

Geotechnics

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“…The variety of immobilization mechanisms interpreted from these studies demonstrates MICP’s versatility in the field of bioremediation. Current research investigates MICP application to tailings [ 90 , 91 , 92 , 93 ], deep-sea mining [ 94 ], and contaminated soil nearby mining and smelting operations [ 95 , 96 ].…”

Section: Bioremediation Processes—geophysical and Biochemical Interac...mentioning

confidence: 99%

Microbially Induced Calcium Carbonate Precipitation as a Bioremediation Technique for Mining Waste

Wilcox,

Mulligan,

Neculita

2024

Toxics

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Mining waste represents a global issue due to its potential of generating acidic or alkaline leachate with high concentrations of metals and metalloids (metal(loid)s). Microbial-induced calcium carbonate precipitation (MICP) is an engineering tool used for remediation. MICP, induced via biological activity, aims to precipitate calcium carbonate (CaCO3) or co-precipitate other metal carbonates (MCO3). MICP is a bio-geochemical remediation method that aims to immobilize or remove metal(loid)s via enzyme, redox, or photosynthetic metabolic pathways. Contaminants are removed directly through immobilization as mineral precipitates (CaCO3 or MCO3), or indirectly (via sorption, complexes, or inclusion into the crystal structure). Further, CaCO3 precipitates deposited on the surface or within the pore spaces of a solid matrix create a clogging effect to reduce contaminant leachate. Experimental research on MICP has shown its promise as a bioremediation technique for mining waste. Additional research is required to evaluate the long-term feasibility and potential by-products of MICP-treated/stabilized waste.

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“…Ghalandarzadeh et al [ 10 ] used MICP to improve the unconfined compressive strength of kaolinite clay. Behzadipour et al [ 11 ] explored the application of MICP technology in improving the shear strength of gold mine tailings. The experimental results showed that compared with the untreated samples, the cohesion intercept and friction angle of the treated tailings samples increased by about 19 kPa and 5°, respectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Wind Erosion Resistance of Aeolian Sand Solidified by Microbially Induced Calcite Precipitation (MICP)

Qu,

Li,

et al. 2024

Materials

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Microbially induced calcite precipitation (MICP) is an emerging solidification method characterized by high economic efficiency, environmental friendliness, and durability. This study validated the reliability of the MICP sand solidification method by conducting a small-scale wind tunnel model test using aeolian sand solidified by MICP and analyzing the effects of wind velocity (7 m/s, 10 m/s, and 13 m/s), deflation angle (0°, 15°, 30°, and 45°), wind erosion cycle (1, 3, and 5), and other related factors on the mass loss rate of solidified aeolian sand. The microstructure of aeolian sand was constructed by performing mesoscopic and microscopic testing based on X-ray diffraction analysis (XRD), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). According to the test results, the mass loss rate of solidified aeolian sand gradually increases with the increase in wind velocity, deflation angle, and wind erosion cycle. When the wind velocity was 13 m/s, the mass loss rate of the aeolian sand was only 63.6%, indicating that aeolian sand has excellent wind erosion resistance. CaCO3 crystals generated by MICP were mostly distributed on sand particle surfaces, in sand particle pores, and between sand particles to realize the covering, filling, and cementing effects.

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Effect of microbial-induced calcite precipitation on shear strength of gold mine tailings

Cited by 8 publications

References 111 publications

Increased Microbially Induced Calcium Carbonate Precipitation (MICP) Efficiency in Multiple Treatment Sand Biocementation Processes by Augmentation of Cementation Medium with Ammonium Chloride

Increased Microbially Induced Calcium Carbonate Precipitation (MICP) Efficiency in Multiple Treatment Sand Biocementation Processes by Augmentation of Cementation Medium with Ammonium Chloride

Microbially Induced Calcium Carbonate Precipitation as a Bioremediation Technique for Mining Waste

Experimental Study on the Wind Erosion Resistance of Aeolian Sand Solidified by Microbially Induced Calcite Precipitation (MICP)

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