Treatment of MSW fly ashes using the electrodialytic remediation technique

Celia Ferreira, Alexandra B. Ribeiro, Lisbeth M. Ottosen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

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.
Original languageEnglish
Title of host publicationWaste Management and the Environment II : Second International Conference on Waste Management and the Environment
Publication date2004
Pages65-75
ISBN (Print)18-53-12738-8
Publication statusPublished - 2004
Event2nd International Conference on Waste Management and the Environment - Rhodes, Greece
Duration: 29 Sep 20041 Oct 2004
Conference number: 2

Conference

Conference2nd International Conference on Waste Management and the Environment
Number2
Country/TerritoryGreece
CityRhodes
Period29/09/200401/10/2004

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