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General form of the ADE:

General form of the ADE:. sink/source term. Chemical sink/source term. Simple form of the ADE. Uniform 1D flow; longitudinal dispersion; sink/source term. General form of the ADE:. sink/source term. Chemical sink/source term. We will consider two types of chemical reactions

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General form of the ADE:

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  1. General form of the ADE: sink/source term Chemical sink/source term

  2. Simple form of the ADE Uniform 1D flow; longitudinal dispersion; sink/source term

  3. General form of the ADE: sink/source term Chemical sink/source term

  4. We will consider two types of chemical reactions • Sorption (adsorption & absorption) • 1st order irreversible reactions (radioactive decay, • hydrolysis, some forms of biodegradation)

  5. sorption 1st order LEA (Zheng & Bennett)

  6. R > 1 Sorption (or retardation) = v/vc Zheng & Bennett, Fig. 4.3

  7. = v/vc Zheng & Bennett, Fig. 4.3

  8. Linear Isotherm LEA (Local Equilibrium Assumption) Zheng & Bennett, Fig. 4.2

  9. Linear Isotherm from MT3DMS manual

  10. Simple form of the ADE Retardation Factor Uniform 1D flow; longitudinal dispersion; sink/source term; retardation

  11. = vc Simple form of the ADE R = v/vc

  12. Freundlich Isotherms Linear Isotherm Unlimited sorption sites Zheng & Bennett, Fig. 4.2

  13. Freundlich Isotherm

  14. Langmuir Isotherm = maximum sorption capacity Limited sorption sites

  15. Langmuir Isotherm

  16. fraction of organic carbon Spitz and Moreno (1996)

  17. Spitz and Moreno ( 1996)

  18. General form of the ADE: Chemical sink/source term

  19. linear Zheng & Bennett

  20. We will consider two types of chemical reactions • Sorption (adsorption & absorption) • 1st order irreversible reactions (radioactive decay, • hydrolysis, some forms of biodegradation) 

  21. Simple form of the ADE 1st order rate constant = ln 2 / half life = 0.693/ t½ Uniform 1D flow; longitudinal dispersion; sink/source term; retardation; 1st order irreversible reaction ( is the same for the dissolved phase and the sorbed phase)

  22. Zheng & Bennett

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