March 18, 2021 /

SFB 1313 Publication "Experimental Methods and Imaging for Enzymatically Induced Calcite Precipitation in a Microfluidic Cell"

Authors: Felix Weinhardt, Holger Class, Samaneh Vahid Dastjerdi, Nikolaos Karadimitriou, Dongwon Lee, Holger Steeb
Scientific Journal: Water Resources Research

New publication, published in Water Resources Research. The paper is a cooperation between SFB 1313's research projects C04 and B05 and SimTech (University of Stuttgart):

"Experimental Methods and Imaging for Enzymatically Induced Calcite Precipitation in a Microfluidic Cell"

Authors
Abstract

Enzymatically induced calcite precipitation (EICP) in porous media can be used as an engineering option to achieve precipitation in the pore space, for example, aiming at a targeted sealing of existing flow paths. This is accomplished through a porosity and consequent permeability alteration. A major source of uncertainty in modeling EICP is in the quantitative description of permeability alteration due to precipitation. This report presents methods for investigating experimentally the time-resolved effects of growing precipitates on porosity and permeability on the pore scale, in a poly-di-methyl-siloxane microfluidic flow cell. These methods include the design and production of the microfluidic cells, the preparation and usage of the chemical solutions, the injection strategy, and the monitoring of pressure drops for given fluxes for the determination of permeability. EICP imaging methods are explained, including optical microscopy and X-ray microcomputed tomography (XRCT), and the corresponding image processing and analysis. We present and discuss a new experimental procedure using a microfluidic cell, as well as the general perspectives for further experimental and numerical simulation studies on induced calcite precipitation. The results of this study show the enormous benefits and insights achieved by combining both light microscopy and XRCT with hydraulic measurements in microfluidic chips. This allows for a quantitative analysis of the evolution of precipitates with respect to their size and shape, while monitoring their influence on permeability. We consider this to be an improvement of the existing methods in the literature regarding the interpretation of recorded data (pressure, flux, and visualization) during pore morphology alteration.

SFB 1313 publication "Experimental Methods and Imaging for Enzymatically Induced Calcite Precipitation in a Microfluidic Cell"

This image shows Felix  Weinhardt
M. Sc.

Felix Weinhardt

Doctoral Researcher, Research Project C04

This image shows Holger Class
apl. Prof. Dr. Ing.

Holger Class

Principal Investigator, Research Project C04, Central Project Z

This image shows Nikolaos K. Karadimitriou
Dr.

Nikolaos K. Karadimitriou

Principal Investigator, Project Z02 (PML)

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