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

Abstract

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
Pages1387-1390
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
http://web.etaflorence.it/142.0.html

Conference

Conference14th European Biomass Conference
Number14
CountryFrance
CityParis
Period17/10/200521/10/2005
Internet address

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