Lecture 50

# Lecture 50 - Groundwater Dispersion and Remediation...

This preview shows pages 1–2. Sign up to view the full content.

Groundwater Dispersion and Remediation ± Lecture#50 ± hydrodynamic dispersion ± Borden injection experiment ± groundwater remediation ± Reading: M: Ch. 5 (CNP pg. 84-87; 98-107) Groundwater Contamination Suppose one gallon of tetrachloroethylene (PCE) is spilled into groundwater. How much groundwater could it contaminant to the MCL? light non-aqueous phase liquid dense non aqueous phase liquid PCE Contamination ± PCE: C sat = 200 mg/L; MCL: 5 ppb (5 ug/L); ρ PCE = 1.62 g/L ± 1 gal = 3.785 L ± gram amount of PCE: ± amount of water contaminated: ± amount of water contaminated to MCL: g 6132 cm g 1.62 x L cm 10 L 785 . 3 3 3 3 = gal 8100 L 3.785 gal 1 x g 200x10 L 1 g 6132 3 - = gal 10 x 28 . 3 L 3.785 gal 1 x g 5.0x10 L 1 g 6132 8 6 - = Advective Flux of Groundwater ± Advective Flux: movement in flow direction ± In rivers: J m = QC/A = ν C (g/s-m 2 ; mass advection) ± In rivers: J v = Q/A ( m/s; water advection) ± In groundwater: Q/A = -Kdh/dl Darcy’s Law ± K hydraulic conductivity; h piezometric head or just head with units of distance; l is the distance over which head loss is measured ± K m/s (units of velocity; same as Q/A) Advection in Porous Media J v = Q/A = -Kdh/dl -K Δ h/L Darcy’s Law J m = QC/(nA) = ν C (pollutant mass flux in groundwater) ( h 2 h 1 )/L Darcy’s Law ICP#40 ± Application of Darcy’s Law for travel time

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 04/17/2008 for the course CEE 260 taught by Professor Kimf.hayes during the Fall '06 term at University of Michigan.

### Page1 / 5

Lecture 50 - Groundwater Dispersion and Remediation...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online