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Difference in phosphate speciation between sewage sludge and biomass ash from fluidized bed combustion
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Engineering.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. (Thermochemical Energy Conversion Laboratory)ORCID iD: 0000-0002-5777-9241
Swedish University of Agricultural Sciences, Department of Forest Biomaterials and Technology.ORCID iD: 0000-0001-8502-8069
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. (Thermochemical Energy Conversion Laboratory)
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2018 (English)In: 27th International Conference of Impacts of Fuel Quality on Power Production and the Environment, September 23–28 September, 2018, Lake Louise, Canada, 2018Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

The role of phosphorus in biomass combustion is a topic that has become increasingly relevantin recent years. Due to the demand for new sources of renewable energy and recovery of phosphorus from waste streams such as sewage sludge, research into the behavior of phosphorus during combustion is necessary for a continued development. This study aims to investigate potential differences in phosphate behavior during co-combustion of sewage sludge compared to other phosphorus-rich biomass or additives. The investigation was carried out in a bench scale bubbling fluidized bed, co-combusting six biomass blends of similar ash composition and combustion conditions but with different phosphorus association (logging residues (LR) or wheat straw (WS) with sewage sludge (SS), dried distiller’s grain (DG), or phosphoric acid (PA)). After combustion, bed ash samples, fly ash deposits and cyclone ash were collected and analyzed for elemental composition (SEM-EDS) and phase composition (XRD). Based on the XRD phase analyses, a significant difference in phosphate speciation were foundbetween biomass blends containing SS compare to DG or PA. Only two phosphate phases were identified in the ash from SS blends compared to a large variety of phosphates in ash from DG or PA blends. The difference in speciation could not be explained by a difference in ash fractionation as the elemental composition of the analyzed ash fractions were similar. Rather, the results indicate that the behavior of phosphorus in SS may be different to that in DG or PA.

Place, publisher, year, edition, pages
2018.
National Category
Energy Engineering Other Chemistry Topics
Identifiers
URN: urn:nbn:se:umu:diva-157280OAI: oai:DiVA.org:umu-157280DiVA, id: diva2:1296100
Conference
International Conference on the Impact of Fuel Quality on Power Production and the Environment
Funder
Swedish Research Council Formas, 2015-619Available from: 2019-03-13 Created: 2019-03-13 Last updated: 2019-03-18Bibliographically approved

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Skoglund, NilsGrimm, AlejandroBoström, Dan
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