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Removal of selected heavy metals from MSW fly ash by the electrodialytic process

✍ Scribed by Célia Ferreira; Pernille Jensen; Lisbeth Ottosen; Alexandra Ribeiro

Publisher
Elsevier Science
Year
2005
Tongue
English
Weight
520 KB
Volume
77
Category
Article
ISSN
0013-7952

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✦ Synopsis

This paper aims to assess the applicability of the electrodialytic remediation technique for the removal of zinc, lead, copper and cadmium from municipal solid waste (MSW) incinerator fly ash. A broad range of experimental conditions were studied including current densities, remediation times, use of assisting agents and cell design.

Several operational problems were identified during the electrodialytic experiments, among which are formation of precipitates, dryness of sample and partial dissolution of sample creating preferential pathways for the electric current. These problems may explain the low remediation efficiencies obtained.

Comparison between experiments showed that generally the use of Na-gluconate as assisting agent leads to better results than distilled water. Increasing the concentration of the assisting agent also results in higher removals.

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