Leachate generation and transport in retorted oil shale

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1986

OSTI ID:7175107

Feerer, J L

X-ray Photoelectric Spectroscopy (XPS) along with other characterization data is used to determine that a pore diffusion model more closely describes leaching of retorted oil shale than a shrinking core model. The pore diffusion model is formulated for multiple mineral phases and aqueous components. The model solves for mineral and aqueous phase concentrations as functions of time and position in a porous particle. Coulombic interactions between the charged aqueous ionic species result in a forced diffusion term in the multicomponent flux expression. The particle model predicts concentrations in a batch slurry experiment using retorted oil shale. Slurry experiment results allow estimation of dissolution rates for each mineral in the particle matrix. Extension of the model to large (>.1 cm) particles indicates that intraparticle diffusion and coulombic interactions are important in describing solute release from large particles in a slurry environment. The generation of leachate in a slurry environment is representative of leaching conditions at the edges of retorted shale disposal piles, where precipitation runoff dominates bulk leachate transport. Percolation of natural and process waters result in leachate transport in the interior of a retorted shale disposal pile. These conditions are simulated by a laboratory column experiment in which deionized water is percolated through a column of retorted oil shale, and the leachate is collected at the exit of the column. Results from the particle model are used to develop a model of leachate generation and transport for the laboratory column. These results indicate that precipitation chemistry and bulk convective transport dominate leachate transport in the interior of a disposal pile.

• Research Organization: Colorado Univ., Boulder (USA)
• OSTI ID: 7175107
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
041000* -- Oil Shales & Tar Sands-- Environmental Aspects
510200 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ATMOSPHERIC PRECIPITATIONS
BENCH-SCALE EXPERIMENTS
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CONVECTION
DECOMPOSITION
DIFFUSION
DISPERSIONS
DISSOLUTION
ELECTRON SPECTROSCOPY
ENERGY SOURCES
ENERGY TRANSFER
ENVIRONMENTAL TRANSPORT
FLOW MODELS
FOSSIL FUELS
FUELS
HEAT TRANSFER
INDUSTRIAL PLANTS
LEACHATES
LEACHING
MASS TRANSFER
MATERIALS
MATHEMATICAL MODELS
MINERAL WASTES
MINERALS
MIXTURES
OIL SHALE PROCESSING PLANTS
OIL SHALES
PHOTOELECTRON SPECTROSCOPY
POROSITY
RAIN
RETORTING
SEPARATION PROCESSES
SIMULATION
SLURRIES
SOLID WASTES
SOLUTIONS
SPECTROSCOPY
SPOIL BANKS
SUSPENSIONS
SYNTHESIS
TIME DEPENDENCE
WASTES
X-RAY SPECTROSCOPY