Environmental Quality Monitoring & Analysis, - Vol 5 | 6. Release from Sediments by Abraham | Learn Smarter
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6. Release from Sediments

This content explores the complexities of mass balance within sediment systems, particularly focusing on the processes of diffusion and the roles of porosity and adsorption. It emphasizes the critical concept of effective diffusivity in porous media and presents equations governing these processes, including the Millington Quirk expression for diffusion coefficients. The chapter also addresses local equilibrium assumptions in the context of adsorption and desorption dynamics.

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Sections

  • 1

    Environmental Quality: Monitoring And Analysis

    This section discusses the mass balance in sediment volumes, focusing on the dynamics of accumulation and diffusion processes influencing environmental quality.

    Learning Practice

  • 1.1

    Release From Sediments

    This section discusses the principles of mass balance in sediments, focusing on the release and diffusion of substances from sediment into the surrounding environment.

    Learning Practice

  • 2

    Mass Balance In Sediment Volume

    This section discusses the mass balance principles in sediment volumes, focusing on accumulation and diffusion processes in sediment-water systems.

    Learning Practice

  • 3

    Rate Of Accumulation

    This section discusses the concept of rate of accumulation in environmental monitoring, focusing on mass balance in sediment systems and effective diffusivity in porous media.

    Learning Practice

  • 4

    Diffusion

    The section discusses the principles of diffusion in environmental systems, emphasizing mass balance and effective diffusivity in porous media.

    Learning Practice

  • 4.1

    Diffusion In Fluid Phase

    This section discusses the principles of diffusion within the fluid phase of environmental systems, focusing on the dynamics of concentration gradients and mass transport through porous media.

    Learning Practice

  • 4.2

    Effective Diffusivity In Porous Media

    This section explores the concept of effective diffusivity in porous media, detailing its role in the mass transfer processes within sediments.

    Learning Practice

  • 4.2.1

    Millington Quirk’s Expression

    The section discusses Millington Quirk's expression, a mathematical model for diffusion in porous media, focusing on the effective diffusion coefficients and the factors influencing them.

    Learning Practice

  • 4.2.2

    Internal Porosity And Complications In Diffusion

    This section discusses the implications of internal porosity in sediments on diffusion processes and the complexities involved in modeling these interactions.

    Learning Practice

  • 4.3

    General Expression For Effective Diffusivity

    This section discusses the formulation of the effective diffusivity in sediment systems, particularly emphasizing the roles of diffusion in porous media and the mathematical representations involved.

    Learning Practice

  • 5

    Equations For Chemical Mass In Liquid System

    This section explores the mass balance equations for chemical mass in liquid systems, focusing on the concepts of diffusion and its impact on sediment and pore water interactions.

    Learning Practice

  • 6

    Local Equilibrium Assumption

    The local equilibrium assumption simplifies the understanding of mass transfer between solid and liquid phases in porous media, assuming rapid equilibration.

    Learning Practice

  • 6.1

    Rate Of Adsorption And Diffusion

    This section discusses the fundamental principles of mass balance concerning the rate of adsorption and diffusion, particularly within sediment environments.

    Learning Practice

  • 7

    Retardation Factor

    This section discusses the concept of the retardation factor in environmental quality monitoring, focusing on its impact on the diffusion and interaction between sediment and water phases.

    Learning Practice

  • 7.1

    Solving The Retardation Equation

    This section discusses the concepts of mass balance in sediment systems, emphasizing the role of diffusion and retardation in the transport of contaminants within porous media.

    Learning Practice

References

56.pdf

Class Notes

Memorization

What we have learnt

  • Understanding mass balance ...
  • Effective diffusivity plays...
  • Local equilibrium assumptio...

Final Test

Revision Tests