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lecture_20 - LECTURE 20 NONCONSERVATIVE SOLUTE TRANSPORT...

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LECTURE 20 - NONCONSERVATIVE SOLUTE TRANSPORT 20.1 MECHANISMS OF INTERACTION, TRANSFORMATION, OR DECAY PHYSICAL MECHANISMS PHYSICAL FILTRATION CLAY PARTICLES 20,000Å SPACING BETWEEN SHEETS 9-15Å PORES IN SAND 10 -10 Å 5 6 SMALLEST SOLUBLE IONS 1-10Å LARGE ORGANIC MOLECULES 500Å BACTERIA 10 -10 Å 3 4 COLLOIDS 10 10 Å 3- 4 FILTRATION MOSTLY IN CLAYEY SOILS AND INVOLVES LARGE ORGANIC MOLECULES, BACTERIA, COLLOIDS GEOCHEMICAL MECHANISMS COMBINING IONS INTO ELECTRICALLY NEUTRAL MOLECULES ACID/BASE REACTIONS OXIDATION PRECIPITATION ADSORPTION/DESORPTION (ION EXCHANGE)
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RADIOLOGICAL MECHANISMS RADIOACTIVE DECAY/DAUGHTER PRODUCTS BIOLOGICAL MECHANISMS DECOMPOSITION/TRANSFORMATION 20.2 RETARDATION FACTOR (R) R = 1 + ( D / 2 )(K ) B D WHERE: D = DRY BULK MASS DENSITY OF SOIL B 2 = VOLUMETRIC MOISTURE CONTENT OF SOIL K = DISTRIBUTION COEF. FOR SOLUTE d IN SOIL = MASS OF SOLUTE /UNIT MASS SF SF CONC. SOLUTE IN SOLUTION v = v / (1 + ( D / 2 )(K ) ) or v = v /R c x B D c x WHERE: v = VELOCITY OF SOLUTE FRONT WHERE c C/C = 0.5 0 v = AVERAGE LINEAR VELOCITY x IN GENERAL:
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