Utilisation of ashes from co-combustion of peat and wood: Case study of a modern CFB-boiler in Finland

Kirsi Korpijärvi, Risto Ryymin, Tero Saarno, Matti Reinikainen, Mikko Räisänen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific


Approximately 500 000 tons of peat and biomass ashes are produced yearly in Finland as by-product of energy production. About half of those are utilised and the rest are placed to landfill sites because options for recycling have not been found. From the beginning of the year 2011 the waste tax was extended to fly ashes. Rising of costs forces power plant owners to search new opportunities to recycle ashes. Possibilities to utilise ashes were studied through a case study of a modern peat and wood fuelled CFB-boiler. Ash samples were analysed and their environmental and technical applicability for fertilizers, earth construction and concrete production were evaluated. Refining experiments were also performed to improve ash suitability for recycling and to find new options for ash use. Main results of the project are presented in the paper.
Original languageEnglish
Title of host publicationProceedings of Ash Utilisation 2012, Ashes in a Sustainable Society
Place of PublicationStockholm
Publication statusPublished - 2012
MoE publication typeNot Eligible
EventASH Utilisation 2012: Ashes in a Sustainable Society - Stockholm, Sweden
Duration: 25 Jan 201227 Jan 2012


ConferenceASH Utilisation 2012


  • combustion
  • peat
  • wood
  • ash utilisation
  • fly ash
  • ash refining

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