Leaching From Biomass Gasification Residues

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

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Abstract

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
PublisherCISA
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

Conference

Conference13th International Waste Management and Landfill Symposium
Number13
CountryItaly
CityS. Margherita di Pula, Cagliari
Period03/10/201107/10/2011

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