Electrodialytically treated MSWI fly ash use in clay bricks

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Fly ash from municipal solid waste incineration (MSWI) is classified as hazardous waste, due to high heavy metal and salt content. Thus, beneficial use is restricted, and the fly ash hazardousness should be reduced before testing reuse options. Electrodialytic treatment can remove heavy metals and soluble salts and be used to decontaminate MSWI fly ash. In Greenland, MSWI fly ash is stored at uncontrolled disposal sites, and a more sustainable solution for handling fly ash is needed. At the same time, most construction materials are imported from Europe to Greenland, and increased use of local materials would greatly benefit the circular economy in the area. In this study, it was investigated if local Greenlandic resources could have potential in brickmaking. Two different clays; a Danish clay (used commercially in brick production) and one Greenlandic (not used commercially) and raw and electrodialytically treated MSWI fly ash from Sisimiut, Greenland were used. Small clay discs with a 0, 10, 20 and 30 % substitution of clay by MSWI fly ash were fired at 1000ºC for 24h. Substituting clay with fly ash generally resulted in lower technical properties of the clay discs. From this initial screening, the clay discs with electrodialytically treated fly ash and Greenlandic clay showed the lowest porosity and water absorption, which could be beneficial for use as construction material in cold climates.
Original languageEnglish
Title of host publicationProceedings ICSBM 2019 : 2nd International Conference on Sustainable Building Materials
Publication date2019
Article number005
Publication statusPublished - 2019
Event2nd International Conference of Sustainable Building Materials - Eindhoven University of Technology , Eindhoven, Netherlands
Duration: 12 Aug 201915 Aug 2019
Conference number: 2


Conference2nd International Conference of Sustainable Building Materials
LocationEindhoven University of Technology


  • Heavy metals
  • Circular economy
  • Secondary resources
  • Ceramics
  • Arctic


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