Speciation and mobility of cadmium in straw and wood combustion fly ash |
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Authors: | Hansen H K Pedersen A J Ottosen L M Villumsen A |
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Institution: | Department of Geology and Geotechnical Engineering, The Technical University of Denmark, Lyngby. iggheha@pop.dtu.dk |
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Abstract: | Two fly ashes from biomass combustion have been analysed regarding cadmium speciation and mobility. A fly ash from straw combustion contained 10 mg Cd/kg dry matter, and around 50% of the cadmium was leachable in water. The possible main speciation of cadmium in this fly ash was CdCl2. When adding this fly ash to agricultural soil a threat for groundwater contamination and plant uptake is existing. A fly ash from wood chip combustion had 28.6 mg Cd/kg dry matter. In this fly ash, the cadmium was bound more heavily, with only small amounts of cadmium leached in mild extractants. A possible speciation of cadmium in this fly ash was as oxide or as CdSiO3. Long-term effects and accumulation of cadmium could be a problem when adding this fly ash to agricultural or forest soils. |
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