Effect of chemical treatment of fly ash on the leaching of metals

Conference · Tue Mar 01 04:00:00 EST 1983 · Am. Soc. Test. Mater., Spec. Tech. Publ.; (United States)

OSTI ID:6290503

Young, H W; Boybay, M; Demirel, T; Young, J C

An investigation was conducted to determine the ability of chemical treatment to reduce the leaching of metals from fly ash. A further objective was to determine the effect of cofiring refuse-derived fuels with coal on leachate composition. Samples of fly ash were treated with portland cement, chemically pure lime, and phosphoric acid and subjected to a column leaching process. The leachates were composited weekly and analyzed using X-ray fluorescence and atomic absorption spectrometry. Portland cement or lime reduced the quantity of leached arsenic 40 to 80% from the control samples, whereas those samples fixed with phosphoric acid yielded 50 times more arsenic. Generally, the samples treated with portland cement showed the most uniform reduction in leachate concentrations. Leachates from fly ash produced upon cofiring refuse-derived fuel with coal showed consistently higher concentrations of all elements except for calcium, selenium, and alkalinity. Compaction and curing of the chemically treated ash samples showed little improvement in the ability to control the amount and types of metals appearing in leachates.

• Research Organization: Civil Engineering Department, University of Arkansas, Fayetteville, Arkansas
• OSTI ID: 6290503
• Report Number(s): CONF-8303191-
• Conference Information: Journal Name: Am. Soc. Test. Mater., Spec. Tech. Publ.; (United States) Journal Volume: STP-851
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
09 BIOMASS FUELS
090122 -- Hydrocarbon Fuels-- Preparation from Wastes or Biomass-- (1976-1989)
ABSORPTION SPECTROSCOPY
AEROSOL WASTES
ARSENIC
ASHES
BUILDING MATERIALS
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CEMENTS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COAL
COCOMBUSTION
COMBUSTION
COMPACTING
DISPERSIONS
DISSOLUTION
ELEMENTS
ENERGY SOURCES
FLY ASH
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
INHIBITION
INORGANIC ACIDS
LEACHATES
LEACHING
LIMESTONE
MANAGEMENT
MATERIALS
MIXTURES
NONDESTRUCTIVE ANALYSIS
OXIDATION
PHOSPHORIC ACID
PORTLAND CEMENT
PROCESSING
REFUSE DERIVED FUELS
RESIDUES
ROCKS
SEDIMENTARY ROCKS
SEMIMETALS
SEPARATION PROCESSES
SOLUTIONS
SPECTROSCOPY
THERMOCHEMICAL PROCESSES
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
X-RAY EMISSION ANALYSIS
X-RAY FLUORESCENCE ANALYSIS