Sandbed Consolidation with Mineral Precipitation

Paraskeva, Christakis Α.; Charalambous, Petros C.; Stokka, Lars-Erik; Klepetsanis, Pavlos; Koutsoukos, Petros G.; Read, Peter; Østvold, Terje; Payatakes, A. C.

doi:10.1006/jcis.2000.7161

Cited by 28 publications

(24 citation statements)

References 21 publications

(17 reference statements)

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“…Crystals at junctions are likely to be strength providing crystals (Paraskeva et al, 2000;Ismail et al, 2002), while crystals that form on the sand grain or in the pore space, as expected at higher water content cannot be seen to add to strength. In general, biocementation at the high (> 30%) water content conditions (short 30 cm percolated column and the bottom part of 1-meter percolated column) led to similar strength as the submersed application (Table 1 and Figure 9) suggesting that it is the water content rather the method of application that determines the degree of soil solidification obtained.…”

Section: Bacterial Fixationmentioning

confidence: 94%

In situ soil cementation with ureolytic bacteria by surface percolation

Cheng

Cord‐Ruwisch

2012

Ecological Engineering

276

114

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The possibility of using microbiological processes to improve the mechanical properties of soil by undisturbed in-situ application has gained attention over recent years. This paper describes a new variation of in-situ soil reinforcement technology based on Microbially Induced Carbonate Precipitation (MICP), which involves both the hydrolysis of urea by soil bacteria enzyme and calcium carbonate precipitation in the presence of dissolved calcium ions. In contrast to other previously published approaches, the current work uses surface percolation for in-situ placement of bacteria and cementation solution. Bacteria could be immobilised over the full length of a 1 m column by surface percolation. To accomplish this it was necessary to percolate alternate solutions containing either bacteria or fixation solution containing calcium ions.The biologically triggered cementation resulted in homogeneous cementation over the entire length of the 1-meter sand column. The efficiency of calcite crystals to form strength was found to be related to the pore water content of the continuously drained column with less water content enabling more efficient strength formation. Scanning electron microscopy supported the idea that lower water contents lead to selective positioning of crystals at the bridging points between sand grains. These findings imply that the cost of MICP technology can be reduced by optimizing the conditions for effective crystals precipitation. This is expected to make this technology more readily acceptable for large scale applications

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Section: Bacterial Fixationmentioning

confidence: 94%

In situ soil cementation with ureolytic bacteria by surface percolation

Cheng

Cord‐Ruwisch

2012

Ecological Engineering

276

114

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“…Scaling in the field involves both flowing conditions and heterogeneous nucleation processes. Only few studies can be found that take into account the effect of the flow velocity on the precipitation process [16][17][18][19][20][21][22][23][24]. However, all those studies focus mostly on the kinetics of the precipitation process and not on the induction time itself.…”

Section: Literature Review For the Prediction Of Caco 3 Precipitationmentioning

confidence: 99%

An improved predictive correlation for the induction time of CaCO3 scale formation during flow in porous media

Stamatakis

Stubos

Palyvos

et al. 2005

Journal of Colloid and Interface Science

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“…[4] Although a significant number of researchers have examined pore-scale dissolution [e.g., Békri et al, 1995;Daccord et al, 1993aDaccord et al, , 1993bFredd and Fogler, 1998;Paraskeva et al, 2000] and precipitation [e.g., Borisova and Adler, 2005;Maddinelli, 1998;Sallès et al, 1993;F. Golfier et al, Comparison of theory and experiment for a tworegion solute transport model, submitted to Advances in Water Resources, 2007, hereinafter referred to as Golfier et al, submitted manuscript, 2007] processes in porous media, the numerical tools required to handle such dynamic processes on the pore scale have only just begun to be developed [e.g., Kang et al, 2003;Magnico, 2000;Golfier et al, submitted manuscript].…”

Section: Introductionmentioning

confidence: 99%

A smoothed particle hydrodynamics model for reactive transport and mineral precipitation in porous and fractured porous media

Tartakovsky

Meakin

Scheibe

et al. 2007

Water Resources Research

141

115

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[1] A numerical model based on smoothed particle hydrodynamics (SPH) was used to simulate reactive transport and mineral precipitation in porous and fractured porous media. The stability and numerical accuracy of the SPH-based model was verified by comparing its results with analytical results and finite element numerical solutions. The numerical stability of the model was also verified by performing simulations with different time steps and different number of particles (different resolutions). The model was used to study the effects of the Damkohler and Peclet numbers and pore-scale heterogeneity on reactive transport and the character of mineral precipitation and to estimate effective reaction coefficients and mass transfer coefficients. Depending on the combination of Damkohler and Peclet numbers the precipitation may be uniform throughout the porous domain or concentrated mainly at the boundaries where the solute is injected and along preferential flow paths. The effective reaction rate coefficient and mass transfer coefficient exhibited hysteretic behavior during the precipitation process as a result of changing pore geometry and solute distribution. The changes in porosity and fluid fluxes resulting from mineral precipitation were also investigated. It was found that the reduction in the fluid flux increases with increasing Damkohler number for any particular reduction in the porosity. The simulation results show that the SPH, Lagrangian particle method is an effective tool for studying pore-scale flow and transport. The particle nature of SPH models allows complex physical processes such as diffusion, reaction, and mineral precipitation to be modeled with relative ease.

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Sandbed Consolidation with Mineral Precipitation

Cited by 28 publications

References 21 publications

In situ soil cementation with ureolytic bacteria by surface percolation

In situ soil cementation with ureolytic bacteria by surface percolation

An improved predictive correlation for the induction time of CaCO3 scale formation during flow in porous media

A smoothed particle hydrodynamics model for reactive transport and mineral precipitation in porous and fractured porous media

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