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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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Presentation Transcript
slide1

General form of the ADE:

sink/source term

Chemical sink/source term

slide2

Simple form of the ADE

Uniform 1D flow; longitudinal dispersion;

sink/source term

slide3

General form of the ADE:

sink/source term

Chemical sink/source term

slide4

We will consider two types of chemical reactions

  • Sorption (adsorption & absorption)
  • 1st order irreversible reactions (radioactive decay,
  • hydrolysis, some forms of biodegradation)
slide5

sorption

1st order

LEA

(Zheng & Bennett)

slide6

R > 1

Sorption (or retardation)

= v/vc

Zheng & Bennett, Fig. 4.3

slide7

= v/vc

Zheng & Bennett, Fig. 4.3

slide8

Linear Isotherm

LEA (Local Equilibrium Assumption)

Zheng & Bennett, Fig. 4.2

slide9

Linear Isotherm

from MT3DMS manual

slide10

Simple form of the ADE

Retardation Factor

Uniform 1D flow; longitudinal dispersion;

sink/source term; retardation

slide11

= vc

Simple form of the ADE

R = v/vc

slide12

Freundlich Isotherms

Linear Isotherm

Unlimited sorption sites

Zheng & Bennett, Fig. 4.2

slide14

Langmuir Isotherm

= maximum sorption capacity

Limited sorption sites

slide16

fraction of organic carbon

Spitz and Moreno (1996)

slide18

General form of the ADE:

Chemical sink/source term

slide19

linear

Zheng & Bennett

slide20

We will consider two types of chemical reactions

  • Sorption (adsorption & absorption)
  • 1st order irreversible reactions (radioactive decay,
  • hydrolysis, some forms of biodegradation)

slide21

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)

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