SFB 1313 Publication "Investigation of Crystal Growth in Enzymatically Induced Calcite Precipitation by Micro-Fluidic Experimental Methods and Comparison with Mathematical Modeling"

New SFB 1313 publication, published in Transport in Porous Media:

"Investigation of Crystal Growth in Enzymatically Induced Calcite Precipitation by Micro-Fluidic Experimental Methods and Comparison with Mathematical Modeling"

Authors

• Lars von Wolff (University of Stuttgart, SFB 1313 research project C02)
• Felix Weinhardt (University of Stuttgart, SFB 1313 research project C04)
• Holger Class (University of Stuttgart, SFB 1313 research project C04)
• Johannes Hommel (University of Stuttgart, SFB 1313 associated research project C-X2)
• Christian Rohde (University of Stuttgart, SFB 1313 research projects B03 and C02)

Abstract

Enzymatically induced calcite precipitation (EICP) is an engineering technology that allows for targeted reduction of porosity in a porous medium by precipitation of calcium carbonates. This might be employed for reducing permeability in order to seal flow paths or for soil stabilization. This study investigates the growth of calcium-carbonate crystals in a micro-fluidic EICP setup and relies on experimental results of precipitation observed over time and under flow-through conditions in a setup of four pore bodies connected by pore throats. A phase-field approach to model the growth of crystal aggregates is presented, and the corresponding simulation results are compared to the available experimental observations. We discuss the model’s capability to reproduce the direction and volume of crystal growth. The mechanisms that dominate crystal growth are complex depending on the local flow field as well as on concentrations of solutes. We have good agreement between experimental data and model results. In particular, we observe that crystal aggregates prefer to grow in upstream flow direction and toward the center of the flow channels, where the volume growth rate is also higher due to better supply.