Remediation of As - comparision of two different electrodialytic cells and applicability of treated soil in brick materials

Author(s): Ana Rita Ferreira, Lisbeth M. Ottosen, Nazaré Couto, Alexandra Ribeiro
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference segment on Electrochemistry in Civil Engineering
Editor(s): Lisbeth M. Ottosen
ISBN: 978-2-35158-176-6
e-ISBN: 978-2-35158-177-3
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 60-72
Total Pages: 13
Language : English

Abstract: An electrodialytic process (ED) was applied to clean-up an industrial soil from wood preservation polluted with arsenic (As). Two different cell-conditions were tested, in a 2- compartment cell set-up, using stirred soil suspensions. The experiments were carried out during 14 days, applying a constant current intensity of 5 mA. In addition, after ED a possible reuse of the soil for clay bricks was tested. The best result in the removal of As from suspended soil was obtained when suspended soil was placed in cathode compartment and the pH of the anode was maintained alkaline (pH~10). This setup showed efficiency to remove 74% of As towards the anolyte. In the other setup the soil suspension was kept in anode compartment and the pH of the catholyte was maintained acid (pH ~2). This setup only achieved 3% of As removal towards the catholyte. These results showed that alkaline conditions favored the As desorption from soil to water and that the main transport mechanism was electromigration through the anion exchange membrane towards the anolyte. The treated soil proved to be an option to be used in bricks, which is also an advantage in the management process of soil residue.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00