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Advisor(s)
Abstract(s)
In the present work the electrodialytic remediation technique is applied for the
treatment of fly ash, a hazardous by-product resulting from the incineration of
municipal solid waste. Results are presented for an experiment conducted for 40
days at 38 mA, with a continuously stirred cell. Experimental parameters
monitored include voltage drop, pH and electrolyte’s volumes. Evolution of
heavy metal concentration with time in the different compartments is analysed.
The performance of sodium gluconate for heavy metals extraction from fly ash in
different pH conditions is evaluated in batch extraction tests and during the
electrodialytic treatment. This substance was found to perform well for pH
below 6 and above 9, although extractions are better in the acidic region. Other
relevant observations include the retention of significant amounts of heavy
metals on the cation-exchange membrane separating chambers III and IV and the
dissolution of a large percentage of sample during the treatment. 39% of zinc,
14% of lead, 18% of copper and 60% of cadmium were removed from fly ash
using the electrodialytic technique and these results are compared with
previously reported experiments on similar materials.
Description
Keywords
Heavy metals MSW fly ash Electrodialytic remediation
Pedagogical Context
Citation
Publisher
WIT press