Leachate-treatment technique utilizing fly ash as low-cost sorbent. Quarterly progress report

Technical Report · Fri Jan 01 04:00:00 EST 1982

OSTI ID:5752078

Liskowitz, J W; Grow, J; Sheih, M; Trattner, R; Kohut, J; Zwillenberg, M

A two year investigation is being carried out to design a system for the inexpensive treatment of ash pond effluent or leachate. Twelve different coals were burned in three different types of boilers to determine the influence of coal composition, ash fusion temperatures, boiler additives, combustion conditions and co-firing of natural gas or oil with the coal, on the composition of the fly ash and bottom ash as well as the leaching and sorbate characteristics of the fly ash produced. The trace element analysis in the twelve coals and their respective fly and bottom ashes as well as surface analysis of a selected number of fly ashes using ESCA is reported. The leaching characteristics of the fly ashes with respect to pH have been defined for several trace elements. For low ash fusion coals, Sn, Ni, Mo, Cu, Cr and Mn tend to concentrate in the bottom ash, whereas Ti, Zn and Ba tend to concentrate in the fly ash. Cd, Pb and V did not show a preference. For high ash fusion coal, Sn, Sd, Pb, Mo, Cu, Cr, Ba and V concentrate in the bottom ash and Ti, Ni, Zn and Mn in the fly ash. An increase in boiler temperature favored lower concentrations of the above trace elements in the fly ash from low ash fusion coals. Smaller fly ash particles contained higher concentrations of the above trace elements than larger fly ash particles produced from the same coal. Leaching of Cd, B, Sn, Ni, Pb, Mo, Cu, Cr, Zn, Mu and Fe from the fly ash was found to be directly proportional to (1) the amount of these trace elements present, (2) decreases in pH, (3) decreases in boiler temperatures and (4) increases in ash fusion temperatures. In general fly ash particles which leached the least amount of the above elements exhibited the best sorbate characteristics.

• Research Organization: New Jersey Inst. of Tech., Newark (USA)
• DOE Contract Number: FG22-80PC30231
• OSTI ID: 5752078
• Report Number(s): DOE/PC/30231-3; ON: DE82010501
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600 -- Coal
Lignite
& Peat-- Properties & Composition
010800* -- Coal
Lignite
& Peat-- Waste Management
ADDITIVES
ADSORPTION
AEROSOL WASTES
ALKALINE EARTH METALS
ASHES
BARIUM
CADMIUM
CARBONACEOUS MATERIALS
CHEMICAL COMPOSITION
CHEMICAL EFFLUENTS
CHROMIUM
COAL
COMPARATIVE EVALUATIONS
COPPER
DATA
DISSOLUTION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
FLY ASH
FOSSIL FUELS
FOSSIL-FUEL POWER PLANTS
FUELS
INFORMATION
LEACHING
LEAD
MANAGEMENT
MANGANESE
MATERIALS
MELTING POINTS
METALS
MOLYBDENUM
NUMERICAL DATA
PH VALUE
PHYSICAL PROPERTIES
PONDS
POWER PLANTS
REFRACTORY METALS
RESIDUES
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
SURFACE WATERS
THERMAL POWER PLANTS
THERMODYNAMIC PROPERTIES
TIN
TITANIUM
TRACE AMOUNTS
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
VANADIUM
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
ZINC