Potential carbon dioxide sequestration using biomass combustion ash

Biomass combustion generates solid residues (ash) and greenhouse gaseous emissions. Based on the chemical and mineralogical characteristics, biomass fly ash is an alkaline waste material that could potentially be employed as a CCS substrate. In this paper, mineralogical sequestration of carbon dioxide by means of biomass fly ash carbonation is investigated by conducting experimental accelerated carbonation tests. Fly ash results to be a promising substrate for carbon dioxide sequestration, and the sequestration potential in relation to direct and indirect plant emission factors is assessed. Leaching behaviour of treated ash is also studied, and an environmental issue concerning the selenium and molybden increased leachability comparing to the untreated residue is raised.