Abstract

Dissolution mass transfer of trapped phase (TP) to flowing phase (FP) in porous media plays significant roles in hydrogeology, e.g., groundwater contamination by non-aqueous phase liquids, groundwater in-situ bioremediation, and geological carbon sequestration. In this chapter, this phenomenon is described. First, the physical and mathematical models are given. Afterwards, various conditions affecting this process, i.e., porous media characteristics, capillary trapping characteristics, flow bypassing, TP characteristics, and FP velocity, are discussed. These various conditions are described based on three parameters affecting the dissolution mass transfer: TP interfacial area (A), TP dissolution ratio (ξ), and mass transfer coefficient (k). Eventually, models to predict the mass transfer are formulated based on non-dimensional model. All of the data in this chapter are based on the experiments obtained by using micro-tomography and a series of image processing techniques from our latest works.

Highlights

  • 1.1 Applications of dissolution mass transfer in porous mediaDissolution mass transfer of trapped phase (TP) to flowing phase (FP) in porous media plays significant roles in hydrogeology (Figure 1), e.g., groundwater contamination by non-aqueous phase liquid (NAPL) [1–3], groundwater in-situ bioremediation [4, 5], and geological carbon sequestration (GCS) [6].In groundwater contamination by NAPL, NAPL could leak from industrial plant and contaminate the groundwater stream [1–3]

  • Porous media generated from more angular particles will generates higher aTP

  • Porous media generated from angular and smaller particles leads to faster dissolution, especially at the condition of high STP

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Summary

Applications of dissolution mass transfer in porous media

Dissolution mass transfer of trapped phase (TP) to flowing phase (FP) in porous media plays significant roles in hydrogeology (Figure 1), e.g., groundwater contamination by non-aqueous phase liquid (NAPL) [1–3], groundwater in-situ bioremediation [4, 5], and geological carbon sequestration (GCS) [6]. By using this methods, A and distribution of TP clusters can be monitored throughout dissolution process, and k can be calculated. All of these condition will be investigated based on the point of view of three parameters affecting dissolution mass transfer: A, ξ, and k. The mass transfer model based on non-dimensional number is formulated at the end of the chapter

What is dissolution mass transfer?
Physical model of mass transfer from an interface into a bulk solution
Fluid flow and solute transport in porous media
Calculation of dissolution mass transfer in porous media
Experimental setup As mentioned in
Image processing
Porous media characteristics A porous medium can be described as a solid containing void networks inside it
Capillary trapping characteristics
Flow bypassing
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Trapped phase properties
Flowing phase velocity
Conclusion
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