Impact of Clay DNAPL Interactions on Transport and Storage of Chlorinated Solvents in Low Permeability Zones
Abstract
The objective of this research was to examine clay-DNAPL waste interactions as a contributor to the accumulation of chlorinated compound contamination in subsurface clay lenses and layers. The results showed that contact between DNAPL waste and Na-smectitic clay materials caused a contraction of the clays basal space, producing cracking, in a time frame on the order of weeks. The hypothesized mechanism is syneresis, involving the sorption of the surfactants from the waste onto the clay surface and the solvation of the surfactants aggregates. Numerical simulations suggest that even a small amount of cracking, and the time-variable dissolution of the DNAPL stored in the cracks into the surrounding clay matrix, extends the remediation time by decades.15. SUBJECT
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 2015
- Accession Number
- AD1030820
Entities
People
- Avery Demond
- Junqi Huang
- Mark Goltz
Organizations
- University of Michigan