Leachant pH effects on the leachability of metals from fly ash |
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| Authors: | Lorraine N Fleming Harrison N Abinteh Hilary I Inyang |
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| Institution: | 1. Department of Civil Engineering , Howard University , 2300 6th Street, N.W., Washington, D.C., 20059;2. Avery Denison Company , 35 Penn‐Am Drive, Quakertown, PA, 18951;3. Department of Civil and Environmental Engineering , University of Massachusetts , Lowell, MA, 01854 |
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| Abstract: | The leachability of metals from fly ash produced by a coal‐fired electric plant and a municipal waste incinerator under acidic conditions was experimentally investigated. The results of these column‐leaching experiments show that a decrease in the pH of the leachant favors the extraction of metal ions from solid particles of both coal combustion fly ash and municipal waste incinerator fly ash. The significant increase in the extraction of cadmium, chromium, zinc, lead, mercury, and silver ions from the ash is attributed to the instability of the mineral phases that contain these metals under acidic conditions. |
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| Keywords: | fly ash leaching metals concentration hazardous waste acidic conditions |
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