Long-term leaching tests with high ash fusion Maryland coal slag
- Tennessee Valley Authority, Chattanooga, TN (USA)
The main objective of this project was to investigate the potential environmental impact of the storage or disposal of coal gasification residues. In this regard, this investigation examined the quality of leachate produced during the long-term outdoor storage slag generated at the TVA 200-t/d Texaco gasifier in Muscle Shoals, Alabama. Evaluative laboratory extraction tests were also conducted on both the coarse and fine slag. Leachate quality was tracked in both the surface water and the water at depth after it percolated through the slag pile (leachate well water) by measuring pH and conductivity on a weekly basis and toxic trace elements and other chemical species quarterly or at longer intervals. The major species observed in the leachate well water were Ca and Mg cations as well as sulfate anions. The average electrical conductivity measured in the leachate well water was 2503 {mu}mhos/cm. The measured pH decreased from an initial value of 8.2 and stabilized at about 7.1 with occasional excursions to values as low as 6.3 during dry periods. Concurrently, sulfate concentrations averaged 1083 mg/l with occasional peaks as high as 2600 mg/l. Fe and Mn concentrations measured in the leachate well waters averaged 2.0 and 1.68 mg/l, respectively. Concentrations of species for which Primary Maximum Contaminant Limits (MCLs) for public drinking water supplies have been established were generally below the primary limits with the exception of Se and F which exceeded the limits occasionally. Concentrations of Fe, Mn, sulfate, and total dissolved solids were markedly above the Secondary MCLs set for these species. 35 refs., 2 figs., 21 tabs.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (USA); Tennessee Valley Authority, Chattanooga, TN (USA)
- Sponsoring Organization:
- EPRI; Electric Power Research Inst., Palo Alto, CA (USA)
- OSTI ID:
- 5824631
- Report Number(s):
- EPRI-GS-7185
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
COAL GASIFICATION
SOLID WASTES
SLAGS
LEACHING
ENVIRONMENTAL IMPACTS
ALABAMA
ALUMINIUM
ANTIMONY
ARSENIC
BARIUM
BERYLLIUM
BORON
CADMIUM
CALCIUM
CHEMICAL ANALYSIS
CHLORIDES
CHROMIUM
COAL GASIFICATION PLANTS
COBALT
COPPER
DRINKING WATER
ECOLOGICAL CONCENTRATION
ELECTRIC CONDUCTIVITY
FLUORIDES
GROUND DISPOSAL
GROUND WATER
IONIC CONDUCTIVITY
IRON
LEACHATES
LEAD
MAGNESIUM
MANGANESE
MERCURY
MOLYBDENUM
NICKEL
PH VALUE
PHOSPHORUS
POTASSIUM
QUALITY CONTROL
SAFETY STANDARDS
SAMPLE PREPARATION
SAMPLING
SELENIUM
SILICON
SILVER
SODIUM
STORAGE
STRONTIUM
SULFATES
SURFACE WATERS
TEXACO GASIFICATION PROCESS
THALLIUM
TIN
TITANIUM
TOXICITY
TRACE AMOUNTS
VANADIUM
ZINC
ALKALI METALS
ALKALINE EARTH METALS
CHLORINE COMPOUNDS
CONTROL
DISPERSIONS
DISSOLUTION
ELECTRICAL PROPERTIES
ELEMENTS
FEDERAL REGION IV
FLUORINE COMPOUNDS
GASIFICATION
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
MANAGEMENT
METALS
MIXTURES
NONMETALS
NORTH AMERICA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SEMIMETALS
SEPARATION PROCESSES
SOLUTIONS
STANDARDS
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
USA
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
WATER
010900* - Coal
Lignite
& Peat- Environmental Aspects
540320 - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)