Leaching From Biomass Gasification Residues

Elisa Allegrini, Alessio Boldrin, A. Polletini, R. Pomi, Thomas Astrup

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    The aim of the present work is to attain an overall characterization of solid residues from biomass gasification. Besides the determination of chemical and physical properties, the work was focused on the study of leaching behaviour. Compliance and pH-dependence leaching tests coupled with geochemical modelling were carried out both on fresh and aged samples. The results showed that the material is comparable to residues from wood combustion and the leaching behaviour was dominated by Ca-containing minerals and solid solutions. Heavy metals were detected in very low concentrations in the bulk composition, and DOC complexation and sorption mechanisms were found to have a great influence on their release. Like wood combustion residues, the analysed ashes could be relevant for recycling in agriculture or forestry because of the potential as liming agent and source of macroelements. However, the high reactivity turned out to limit this utilization option, even after ageing processes.
    Original languageEnglish
    Title of host publicationSardinia 2011, Thirteenth International Waste Management and Landfill Symposium
    Place of PublicationItaly
    Publication date2011
    Publication statusPublished - 2011
    Event13th International Waste Management and Landfill Symposium - S. Margherita di Pula, Cagliari, Italy
    Duration: 3 Oct 20117 Oct 2011
    Conference number: 13


    Conference13th International Waste Management and Landfill Symposium
    CityS. Margherita di Pula, Cagliari


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