A methodology to predict long-term leaching potential of metals from Class F fly ash based on short-term laboratory tests

Date

1995-12

Journal Title

Journal ISSN

Volume Title

Publisher

Texas Tech University

Abstract

Coal fly ash is produced from the combustion of pulverized coal in electric power generation industries. In spite of its many desirable geotechnical characteristics, it contains a large number of heavy metals. These metal ions get released readily in aqueous environment, causing future threat to environment. This research was concerned with the development of a methodology for predicting long-term leaching behavior of metals from fly ash using short-term laboratory tests data.

The objectives of this study were achieved by an experimental phase and a modeling phase. The experimental phase consisted of a series of laboratory column tests on fly ash samples, collected from Hoechst Celanese plant at Pampa, using a number of controlled test conditions. The volume of leachate, equal to volume of leachate produced in landfills over 100 years, generated in the laboratory tests was analyzed for metal concentrations. A MSW model by Belvi and Baccini (1988), out of a number of models, used to simulate the laboratory test data. The same model was used for long-term prediction of metal concentrations in" the leachate.

Description

Keywords

Fly ash -- Testing, Leaching

Citation