Differential distribution of chemical and ecotoxicological levels of biomass ashes by size fractionation

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Abstract

The main aim of this work was to study the chemical and ecotoxicological properties of different particle size fractions of bottom and fly ashes coming from a biomass power plant. Bottom and fly ashes were sieved in different size fractions. The size fractions with higher mass percentages were submitted to an acidic digestion and water leaching. The acidic samples and eluates were chemically characterized. The eluates were also submitted to an ecotoxicological characterization. The highest concentrations of metals and metalloids were found in the lower particle size fractions of bottom and fly ashes. It was not observed any releasing pattern from the particle size fractions, except in the fly ashes in which the releasing rate of some earth and alkali-earth metals seemed to increase in the lower particle size fractions. No specific pattern on the toxicity distribution through the different particle size fractions of bottom and fly ashes was determined, except that the particle size fractions of bottom ashes of 4,000-10,000 μm and >10,000 μm have shown lower toxicity levels than the other particle size fractions.
Original languageUnknown
Title of host publicationCD-ROM of the 1st International Conference on Wastes - Solutions, Treatments and Opportunities, 12-14 September, Universidade do Minho, Guimarães, Portugal
Pages6 pp.
Publication statusPublished - 1 Jan 2011
Event1st International Conference on Wastes - Solutions, Treatments and Opportunities, 12-14 September, Universidade do Minho, Guimarães, Portugal -
Duration: 1 Jan 2011 → …

Conference

Conference1st International Conference on Wastes - Solutions, Treatments and Opportunities, 12-14 September, Universidade do Minho, Guimarães, Portugal
Period1/01/11 → …

Cite this

Mendes, B. S., & Nunes, N. C. L. D. S. (2011). Differential distribution of chemical and ecotoxicological levels of biomass ashes by size fractionation. In CD-ROM of the 1st International Conference on Wastes - Solutions, Treatments and Opportunities, 12-14 September, Universidade do Minho, Guimarães, Portugal (pp. 6 pp.)