Column leaching teats of coal combustion by-products
- Bureau of Mines, Pittsburgh, PA (United States). Pittsburgh Research Center
Coal combustion by-products (fly ash, bottom ash, and flue gas desulfurization sludge) are classified as residual wastes, and their disposal is regulated by the states. When coal combustion by-products are placed in abandoned or inactive surface and underground coal mines, they may react chemically with naturally occurring fluids, such as rain, ground water and acid mine drainage. The US Bureau of Mines is investigating possible reactions with a series of column leaching tests. Approximately 1 kg of material is placed in each of seven 5-cm by 1 m acrylic columns. The material is leached at a nominal rate of 250 mL/d for 60 days. Lixiviants include deionized water, artificial ground water, synthetic precipitation, and dilute solutions of acetic acid, ammonium hydroxide, sulfuric acid, and ferric chloride. Leachate is analyzed for pH, acidity/alkalinity, iron, calcium, aluminum, manganese, magnesium and heavy metals. Leaching tests have so far been completed on four fly ash samples. Eleven heavy metals were detected in at least 1% of the leachate samples; the average dissolution rate varied between 0.1 and 70 ppb per day.
- OSTI ID:
- 257016
- Report Number(s):
- CONF-950952--
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANTIMONY
ARSENIC
ASHES
BARIUM
BENCH-SCALE EXPERIMENTS
BERYLLIUM
CADMIUM
CHROMIUM
COBALT
COMPILED DATA
COPPER
ENVIRONMENTAL IMPACTS
EXPERIMENTAL DATA
FLY ASH
LEACHATES
LEACHING
LEAD
MULTI-ELEMENT ANALYSIS
NICKEL
SELENIUM
SLUDGES
WASTE DISPOSAL
WASTE MANAGEMENT
WATER QUALITY
ZINC