Transport of organic compounds in thermoplastic geomembranes. 1: Mathematical model
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Civil and Environmental Engineering
A quasi-two-dimensional partition-diffusion transport model was developed to determine the diffusion coefficient and partition coefficient for various types of geomembranes from measurements of aqueous organic compound concentrations in a confined, double-compartment apparatus with a geomembrane separating the two compartments. The geomembranes tested were high-density polyethylene (HDPE), very low-density polyethylene (VLDPE), and polyvinyl chloride (PVC) and the permeants were mixtures of methylene chloride, toluene, trichloroethylene (TCE), and m-xylene at 10--100 mg/L. The diffusion coefficient increased exponentially was unaffected by compound concentration and membrane thickness. As HDPE geomembranes had stretched by 5% of their original length, the partition coefficient increased by 0.15--0.6 times. VLDPE had 1.8--3.3 times greater partition coefficients and 1.6--2.8 times greater diffusion coefficients than HDPE, while PVC had 6.2--8.3 times greater partition coefficients and 1--1.8 times greater diffusion coefficients than HDPE.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 395113
- Journal Information:
- Journal of Environmental Engineering, Vol. 122, Issue 9; Other Information: PBD: Sep 1996
- Country of Publication:
- United States
- Language:
- English
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