Multi-scale analysis of the mechanism of microbially induced calcium carbonate precipitation consolidation loess

Zhou, Xingyu; Wang, Guihe; Zhang, Haonan; Jia, Cangqin; Tang, Guowang

doi:10.1007/s11356-023-27862-w

Cited by 4 publications

(1 citation statement)

References 43 publications

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“…To better understand the changes in the internal microstructure of WDCS due to FT and DW cycling, Figure a,c were processed using the method of Zhou et al Figures and display the processing outcomes. The pore structure of the processed images is clear and convenient for further calculations.…”

Section: Resultsmentioning

confidence: 99%

Microbial Synergistic Active Magnesium Oxide Solidification of Water-Based Drilling Cuttings and Analysis of Its Durability Strength Loss Mechanism

Zhou,

Wang,

Tang

et al. 2024

ACS Sustainable Chem. Eng.

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The solidification, recycling, and reuse of water-based drilling cuttings (WDC), a waste generated during oil and gas extraction, has been the subject of intense research interest. Developing an efficient and environmentally friendly solidification method is the key objective of this research. This study employs microbial synergistic active magnesium oxide (MgO) technology to solidify WDC. The solidifying mechanism is that carbonate ions produced by microbial metabolism and hydrolysis of urea were able to react with magnesium hydroxide generated by hydration to produce different types of hydrated magnesium carbonates (HMCs), which filled the pores between the drilling cutting particles while bonding the particles to form water-based drilling cutting solidified body (WDCS). The durability and strength of the WDCS were evaluated by subjecting the WDCS to 10 freeze−thaw (FT) cycles and 6 dry-wet (DW) cycles. The main phases in the WDCS are SiO 2 , CaCO 3 , MgO, Mg(OH) 2 , hydromagnesite, and barringtonite. Notably, the mass and density of WDCS decreased significantly after DW cycles. The strength of WDCS improved during roomtemperature curing conditioning (at 25 °C, the curing time corresponds to the durability test). However, it decreased by 23 and 75% following the FT and DW cycles, respectively. Further analysis indicates that the strength loss is related to the crystallinity and content of the main phases in WDCS, as well as changes in the pore structure. The crystallinity and content of the WDCS main phases are lower after the DW cycle than after the FT cycle. This is also consistent with changes in strength. The internal pore structure of WDCS changed differently under different cycling conditions. In comparison to the FT cycle, the number of WDCS internal pores increased following the DW cycle, and the pore size distribution exhibited uniformity and continuity.

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Section: Resultsmentioning

confidence: 99%

Microbial Synergistic Active Magnesium Oxide Solidification of Water-Based Drilling Cuttings and Analysis of Its Durability Strength Loss Mechanism

Zhou,

Wang,

Tang

et al. 2024

ACS Sustainable Chem. Eng.

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Biopolymer-assisted enzyme-induced carbonate precipitation for immobilizing Cu ions in aqueous solution and loess

Xie,

Cheng,

Wang

et al. 2023

Environ Sci Pollut Res

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Wastewater, discharged in copper (Cu) mining and smelting, usually contains a large amount of Cu 2+ .Immobilizing Cu 2+ in aqueous solution and soils is deemed crucial in preventing its migration into surrounding environments. In recent years, the enzyme-induced carbonate precipitation (EICP) has been widely applied to Cu immobilization. However, the effect of Cu 2+ toxicity denatures and even inactivates the urease. In the present work, the biopolymer-assisted EICP technology was proposed. The inherent mechanism affecting Cu immobilization was explored through a series of test tube experiments and soil column tests. Results indicated that 4 g/L chitosan may not correspond to a higher immobilization e ciency because it depends as well on surrounding pH conditions. The use of Ca 2+ not only prevented the nucleation of the urease with Cu 2+ by the electrostatic repulsion but reduced the potential for Cu 2+ to migrate into nearby environments when malachite and azurite minerals are wrapped by calcite minerals. The species of carbonate precipitation that are recognized in the numerical simulation supported the above claim. On the other hand, UC1 (urease and chitosan colloid) and UC2 (urea and calcium source) grouting reduced the effect of Cu 2+ toxicity by transforming the exchangeable state-Cu into the carbonate combination state-Cu. The side effect, induced by 4 g/L chitosan, promoted the copper-ammonia complex formation in the shallow ground, while the acidic environments in the deep ground prevented Cu 2+ from coordinating with soil minerals. These badly degraded the immobilization e ciency. The Raman spectroscopy and XRD test results tallied with the above results. The ndings shed light on the potential of applying the biopolymer-assisted EICP technology to Cu-contaminated water bodies and sites remediation.

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Properties and mechanisms of steel slag strengthening microbial cementation of cyanide tailings

Zou,

Xiao,

Jiang

et al. 2024

Chemosphere

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Multi-scale analysis of the mechanism of microbially induced calcium carbonate precipitation consolidation loess

Cited by 4 publications

References 43 publications

Microbial Synergistic Active Magnesium Oxide Solidification of Water-Based Drilling Cuttings and Analysis of Its Durability Strength Loss Mechanism

Microbial Synergistic Active Magnesium Oxide Solidification of Water-Based Drilling Cuttings and Analysis of Its Durability Strength Loss Mechanism

Biopolymer-assisted enzyme-induced carbonate precipitation for immobilizing Cu ions in aqueous solution and loess

Properties and mechanisms of steel slag strengthening microbial cementation of cyanide tailings

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