Attenuation of pollutants in municipal landfill leachate by clay minerals. Final report Dec 72-Aug 75
The first part of this project was a laboratory column study of attenuation of pollutants in municipal solid waste landfill leachate by mixtures of sand and calcium-saturated clays. K, NH4, Mg, Si, and Fe were moderately attenuated; and the heavy metals Pb, Cd, Hg, and Zn were strongly attenuated even in columns with small amounts of clay. Precipitation was the principal attenuation mechanism for the heavy metals; cation exchange was responsible for any attenuation of the other elements. The clays, in order of increasing attenuation capacity, were Kaolinite, Illite, Montmorillonite. The second part of the project involved batch studies of adsorption of Cr, Cu, Pb, Cd, Hg, and Zn by Montmorillonite and Kaolinite from water solutions and from landfill leachate. Adsorption of the cations Cr(III), Cu, Pb, Cd, Hg, and Zn increased with increasing pH; adsorption of the anions Cr(VI), As, and Se decreased with increasing pH. Above pH about 5.3 precipitation of the cations was an important mechanism while adsorption was the principal mechanism for the anions over the pH range studied. Because adsorption/mobility of any element was affected by other solutes in leachate, adsorption information on one leachate may not be directly applied to predicting adsorption of the same element at the same concentration in another leachate.
- Research Organization:
- Illinois State Geological Survey, Urbana (USA)
- DOE Contract Number:
- EPA-68-03-0211
- OSTI ID:
- 6312927
- Report Number(s):
- PB-287140
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMMONIUM COMPOUNDS
ION EXCHANGE
CADMIUM
ADSORPTION
PRECIPITATION
COPPER
ILLITE
SORPTIVE PROPERTIES
IRON
KAOLINITE
LEAD
MAGNESIUM
MERCURY
MONTMORILLONITE
POTASSIUM
SILICON
ZINC
LEACHING
MUNICIPAL WASTES
PH VALUE
SANITARY LANDFILLS
SOLID WASTES
WASTE DISPOSAL
ALKALI METALS
ALKALINE EARTH METALS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CLAYS
DISSOLUTION
ELEMENTS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MANAGEMENT
METALS
MINERALS
OXYGEN COMPOUNDS
SEMIMETALS
SEPARATION PROCESSES
SILICATES
SILICON COMPOUNDS
SORPTION
SURFACE PROPERTIES
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTES
510200* - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)
400201 - Chemical & Physicochemical Properties