Leaching of lignite ash by rain and acid rain. Final report
Samples of lignite ash were obtained from the start-up operations of the San Miguel Electric Cooperative Power Station at Jourdanton, Texas. Fly ash and bottoms ash were subjected to the conditions of a worst case analysis by refluxing with demineralized water in order to determine the maximum concentrations of hazardous inorganic pollutants which could be leached from the ash samples. The leachate was analyzed for cadmium, cobalt, copper, lead, manganese, nickle, silver, and zinc. Effects of varying the pH of the leaching water upon the concentrations of these species in the leachate were also assessed. For the fly ash, the concentrations of cadmium, cobalt, lead, nickel, and silver in the fly ash leachate were lower than the detection limits of the analyticl technique at all pH values. Zinc was detectable at all pH levels studied, and copper and manganese were detected at the most acidic pH levels. Results from the bottoms ash leaching experiments were quite different from those obtained from the leaching of fly ash with regards to pH effects, total dissolved solids, and metals in the leachate. At all pH values utilized, the concentrations of cadmium, cobalt, copper, lead, and silver in the bottoms ash leachate were below the detection limits of the analytical technique. Cobalt, manganese, nickel, and zinc were detected at most pH values. The results indicate that the exhaustive leaching of the fly and bottoms ash from the combustion of Texas lignite does produce concentrations of some hazardous inorganic constituents which are in the range of hundredths to tenths of a part per million.
- Research Organization:
- Texas Tech Univ., Lubbock (USA)
- OSTI ID:
- 6931009
- Report Number(s):
- TENRAC/EDF-046; ON: DE83900691
- Country of Publication:
- United States
- Language:
- English
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ASHES
LEACHATES
FLY ASH
FOSSIL-FUEL POWER PLANTS
CHEMICAL COMPOSITION
CADMIUM
COBALT
EXPERIMENTAL DATA
LEACHING
LEAD
LIGNITE
NICKEL
PH VALUE
SILVER
START-UP
TEXAS
WATER
ZINC
AEROSOL WASTES
BROWN COAL
CARBONACEOUS MATERIALS
COAL
DATA
DISPERSIONS
DISSOLUTION
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HYDROGEN COMPOUNDS
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NORTH AMERICA
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SOLUTIONS
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USA
WASTES
010600* - Coal
Lignite
& Peat- Properties & Composition
010800 - Coal
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