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Characterization, extraction, and reuse of coal-gasification solid wastes. Volume 2. Leaching behavior of fixed-bed gasification ash derived from northern great plains lignite. Final report, May 1983-June 1986

Technical Report ·
OSTI ID:5993963
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The leaching behavior of eight specimens of fixed-bed lignite-gasification ash, including ash from the Great Plains (GPGA) plant in Beulah, North Dakota, was studied. Four batch leaching tests were used: (1) EPA-EP; (2) a test with synthetic ND groundwater; (3) ASTM D3987-81; (4) long-term (120 day). One GPGA ash was leached according to the draft TCLP protocol. The EPA-EP test leachates from all of the ashes had metal concentrations a factor of ten or more below the values that define a hazardous waste according to the RCRA criteria. The ash specimens were highly alkaline and produced pH's in the range 10-13 during tests 2-4. Leachates from the EPA-EP test had RCRA metal concentrations comparable to, or less than, those derived from combustion ash derived from the same coal. The metal concentrations in leachates from tests 2 and 3 were also well below the RCRA limits. The long-term test used liquid-to-solid ratios of 2:1 and 20:1 and deionized water. During the 120 days, at least 5% of the Na, K, Al, S (as SO4), As, Mo, Se, B, and V in the ash was extracted.
Research Organization:
North Dakota Univ., Grand Forks (USA). North Dakota Mining and Mineral Resources Research Inst.
OSTI ID:
5993963
Report Number(s):
PB-87-230223/XAB
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010404 -- Coal
Lignite
& Peat-- Gasification
010800* -- Coal
Lignite
& Peat-- Waste Management
AEROSOL WASTES
ASHES
CERAMICS
COAL GASIFICATION PLANTS
DISSOLUTION
ELEMENTS
EQUIPMENT
FLY ASH
INDUSTRIAL PLANTS
INDUSTRIAL WASTES
LEACHING
MANAGEMENT
MATERIALS RECOVERY
METALS
MINERAL WOOL
NONMETALS
POLLUTION CONTROL EQUIPMENT
PROCESSING
RECOVERY
RESIDUES
SCRUBBERS
SEPARATION PROCESSES
SULFUR
WASTE MANAGEMENT
WASTE PROCESSING
WASTE PRODUCT UTILIZATION
WASTES