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Fate of Phosphorus in Fixed Bed Combustion of Biomass and Sewage Sludge
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.ORCID iD: 0000-0002-5777-9241
2020 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 34, no 4, p. 4587-4594Article in journal (Refereed) Published
Abstract [en]

The recovery of phosphorus (P) from societal waste streams, such as sewage sludge, could make a significant contribution to alleviating the global dependency upon non-renewable phosphate sources, such as phosphate rock. This study aims to determine the effect of fuel ash composition, chemical association, and combustion technology on the fate of P in ashes from the combustion of sewage sludge and biomass blends to enable more efficient P recovery from combustion ashes. Experiments were performed in a fixed bed pellet burner (20 kW), combusting two sewage sludge blends and three biomass blends of similar fuel ash composition but with different P source (sewage sludge, dried distiller's grain with solubles, or phosphoric acid). Slag, bottom ash, and particulate matter samples were collected and analyzed by scanning electron microscopy-energy-dispersive X-ray spectroscopy and X-ray diffraction for morphology and elemental and crystalline phase composition and compared to results from experiments in fluidized bed combustion using the same fuel blends reported separately. The distribution and elemental composition of ash fractions indicated that sub-micrometer particles contained a minor share of fuel P, with the significant share of fuel P found in the slag and bottom ash fractions. No apparent difference in phosphate speciation could be observed between the slag and bottom ash from sewage sludge blends and biomass blends, with a range of crystalline Ca, Mg, and K phosphates detected in the ash. By comparison, only Ca-rich phosphates were detected in the ashes from the combustion of the sewage sludge blends in the bench-scale fluidized bed. The difference in P speciation between the technologies was attributed to a difference in the process temperature between the two technologies. In comparison to fluidized bed combustion, fixed bed combustion favored the formation of (Ca, Mg)-K phosphates rather than Ca phosphates for similar fuel blends.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2020. Vol. 34, no 4, p. 4587-4594
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:umu:diva-170546DOI: 10.1021/acs.energyfuels.9b03976ISI: 000526324100055OAI: oai:DiVA.org:umu-170546DiVA, id: diva2:1430537
Funder
Swedish Research Council Formas, 942-2015-619Swedish Research Council, 2017-05331Available from: 2020-05-15 Created: 2020-05-15 Last updated: 2020-05-15Bibliographically approved

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Skoglund, NilsGrimm, Alejandro
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