Long-term leaching test of incinerator bottom ash: Evaluation of Cu partition
Resource
Waste Management 27 (7): 954-960
Journal
Waste Management
Journal Volume
27
Journal Issue
7
Pages
954-960
Date Issued
2007
Date
2007
Author(s)
Abstract
Two types of leaching tests were performed on the bottom ash from municipal solid waste incinerators. A short-term batch test specified by the America Nuclear Society (ANS) and long-term column tests with acetic acid (pH 5.2) as leaching solution were used to evaluate copper leachability. The Cu leaching after the 5-d ANS test is about 1% of the original Cu content of 5300 mg/kg. Upon addition of a stabilizing agent, the Cu leaching quantity is reduced; the extent of reduction depends on the type of chemical used (phosphate, carbonate and sulfide). The 1.6% Na2S addition showed negligible Cu leaching, and Na2S was, therefore, used in subsequent column tests. The 30-d column test indicates a steady increase of Cu leaching amount with time and reaches about 1.5% of the original Cu content after 30 d. A 180-d column test further increased the Cu leaching to about 5.1% of the original Cu content, whereas no appreciable Cu leaching was found with the addition of 1.6% Na2S. A sequential extraction was conducted on the raw ash, ash with the addition of Na2S and the residue ash after 30 d of operation to characterize Cu affinity for different solid fractions. The data were used to evaluate the fate of Cu through these interactions. © 2006 Elsevier Ltd. All rights reserved.
Other Subjects
Copper; Extraction; Leaching; Solid wastes; Copper leachability; Leaching quantity; Municipal solid waste incinerators (MSWI); Sequential extraction; Waste incineration; acetic acid; copper; sodium sulfide; Copper; Extraction; Leaching; Solid wastes; Waste incineration; ash; copper; incineration; leaching; municipal solid waste; article; ash; chemical analysis; incineration; leaching; metal binding; priority journal; reduction; solid waste management; Acetic Acid; Hydrogen-Ion Concentration; Incineration; Industrial Waste; Metals; Sulfides; Water Pollutants, Chemical
Type
journal article
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