Electrodialytic removal of cadmium from biomass combustion fly ash in larger scale

Anne Juul Pedersen, Lisbeth M. Ottosen, Peter Simonsen, Jann Aune

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    Due to a high concentration of the toxic heavy metal cadmium (Cd), biomass combustion fly ash often fails to meet the Danish legislative requirements for recycling on agricultural fields. It has previously been shown that it is possible to reduce the concentration of Cd in different bio ashes significantly by using electrodialytic remediation, an electrochemically assisted extraction method. In this work the potential of the method was demonstrated in larger scale. Three different experimental set-ups were used, ranging from bench-scale (25 L ash suspension) to pilot scale (0.3 - 3 m3). The experimental ash was a straw combustion fly ash suspended in water. Within 4 days of remediation, Cd concentrations below the limiting concentration of 5.0 mg Cd/kg DM for straw ash were reached. On the basis of these results, the energy costs for remediation of ash in industrial scale have been estimated to app. 35 €/ton, thus electrodialytic remediation seems to be a reasonable alternative to disposal.
    Original languageEnglish
    Title of host publication14th European Biomass Conference & Exhibition : Biomass for Energy, Industry and Climate Protection
    Number of pages2209
    PublisherETA-Florence Renewable Energies
    Publication date2005
    ISBN (Print)88-89407-07-7
    Publication statusPublished - 2005
    Event14th European Biomass Conference: Biomass for Energy, Industry and Climate Protection - Paris, France
    Duration: 17 Oct 200521 Oct 2005
    Conference number: 14


    Conference14th European Biomass Conference
    Internet address

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