Due to a high concentration of Cd, biomass combustion fly ash often fails to meet the Danish legislative requirements for recycling on agricultural fields. In this work the potential of using the method Electrodialytic Remediation to reduce the concentration of Cd in different biomass combustion fly ashes was studied. Four fly ashes were investigated, originating from combustion of straw (two ashes), wood chips, and co-firing of wood pellets and fuel oil, respectively. One of the straw ashes had been pre-washed and was obtained suspended in water, the other ashes were obtained naturally dry. The initial Cd concentration in the ashes varied between 8.8 mg Cd/kg DM (co-firing ash) and 64 mg Cd/kg DM (pre-washed straw ash), and pH varied from 3.7 to 13.3. In spite of large differences in ash characteristics, the electrodialytic remediation experiments indicated a good remediation potential for all four ashes. Final Cd concentrations below 2.0 mg Cd/kg were reached in all ashes within 14 days of remediation and legislative requirements were met. After further optimization of the remediation process on the pre-washed straw ash, limiting concentrations were reached after only 48 hours of remediation. Hence the potential of the process seems very promising.
|Title of host publication||Second World Biomass Conference. Biomass for Energy, Industry and Climate Protection : Proceedings of the World Conference held in Rome, Italy, 10-14 May 2004|
|Editors||W. P. M. Van Swaaij|
|Publication status||Published - 2004|
|Event||2nd World conference and Exhibition on Biomass for Energy, Industry and Climate Protection - Rome, Italy|
Duration: 1 Jan 2004 → …
|Conference||2nd World conference and Exhibition on Biomass for Energy, Industry and Climate Protection|
|Period||01/01/2004 → …|