An Integrated Approach For The Assessment Of
Toxic Properties Of Fly Ash
Author(s)
V. Tsiridis, M. Petala, P. Samaras & G. P. Sakellaropoulos
Abstract
The physicochemical and toxic properties of fly ash samples obtained from
various coal combustion power plants were evaluated in this work using an
integrated approach including chemical analyses and bioassays. Physicochemical
analyses showed that Al, Ca, Fe, Mg and Si were the elements presented in high
concentrations in all solid samples. The results of the chemical analysis of
eluates deduced by the application of standard leaching tests according to EN
12457-2 and TCLP methods indicated that the compounds contained in the fly
ash samples presented a potential to be transferred to the liquid phase depending
upon the leaching method used. The pH values of the EN eluates were in most
cases in the high alkaline range, ranging from 9.5 up to 12.7, while the pH value
of TCLP eluates varied between 3.9 and 7.5. The leachability of the compounds
was higher in TCLP leaching test, indicating that the initial pH value of the
leaching medium affected significantly the transfer of these elements to the
liquid phase. The photobacterium Vibrio fischeri (Microtox test), the crustaceans
Daphnia magna and the rotifers Brachionus calysiflorus were used for the
toxicity measurement of the eluates obtained by the EN leaching test, suggesting
that the toxicity of the eluate samples depended on the test organism used. The
toxicity of the fly ash samples and the corresponding solid filter residuals that
were remained after the EN and TCLP leaching tests was also measured using
the Microtox Basic Solid Phase Test.
Keywords: fly ash, toxicity, leaching tests, Microtox, Daphnia magna,
Brachionus calysiflorus, heavy metals.
Keywords
fly ash, toxicity, leaching tests, Microtox, Daphnia magna,
Brachionus calysiflorus, heavy metals.
Related Book
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