Record Display for the EPA National Library Catalog


Main Title Retardation of Flow in Oil Shale Residues Affected by In situ Hydration.
Author McWhorter, D. B. ;
CORP Author Colorado State Univ., Fort Collins.;Environmental Protection Agency, Cincinnati, OH. Hazardous Waste Engineering Research Lab.
Year Published 1987
Report Number EPA-R-812225; EPA/600/D-87/354;
Stock Number PB88-134028
Additional Subjects Oil shale ; Hydration ; Water flow ; Leaching ; Seepage ; Fluid infiltration ; Permeability ; Hydraulic conductivity ; Leachates ; Hazardous wastes
Library Call Number Additional Info Location Last
NTIS  PB88-134028 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 31p
Leachate may be generated from piles of oil shale solid waste as a result of drainage of waters emplaced with the solid upon disposal and from net infiltration of incident precipitation. The rate and quantity of leachate that may be generated depends heavily on the capillary hydraulic properties of the waste material. Combusted or decarbonized oil shale waste has been found to be highly reactive. Hydration has a marked effect on the quantity of water available for flow and upon the hydraulic properties affecting the flow. The paper presents data which show that the quantity of chemically-bound water is a function of the water available. Equilibrium partitioning of water into the mobile and chemically-bound states is quantified by an isotherm approach. The partitioning isotherm is used to develop an approximate method for calculating the rate of penetration of mobile waters through reactive oil shale solid waste. Example calculations are used to illustrate the magnitude of retardation of flow caused by the chemical reactions. Hydration and associated production of gas can also cause misleading behavior in laboratory permeability tests. Laboratory experience with chemically-active oil shale residues is described.