TY - JOUR
T1 - A comparative study on Cu, Cr and As removal from CCA-treated wood waste by dialytic and electrodialytic processes
AU - Velizarova, Emiliya
AU - Ribeiro, Alexandra B.
AU - Ottosen, Lisbeth M.
N1 - E. Velizarova acknowledges the post-doctoral grant SFRH/BPD/1527/2000 awarded from Fundação para a Ciência e a Tecnologia, Portugal. The authors thank Adelia Castro from Departamento de Ciência do Solo, Estação Agronómica Nacional, for performing the AAS and ICP analyses. ITQB is acknowledged for ICP facility. This work was partly funded by the Project POCTI/32927/AGR/2000, approved by FCT and POCTI, with FEDER funds.
PY - 2002/10/4
Y1 - 2002/10/4
N2 - In this study, electrodialytic and dialytic techniques were used for Cu, Cr and As removal from 20-years out-of-service CCA-treated Pinus pinaster Ait. pole. The effect of applying direct current, as "cleaning agent", of up to 120mA was investigated. Focus was given to a parallel comparison with the performance of a pure dialytic experiment (without an external power supply) in order to reveal transport of charged particles induced solely by internal electrochemical potential differences in the system. Oxalic acid proved to be a more suitable pre-treatment solution than deionised water for wood chips incubation. Evaluation of the IARs of Cu, Cr and As showed that the rates of their appearance in the electrolytes were not linearly related to the current (except for Cr in the catholyte), mainly because of membrane retention. The maximum removal efficiencies obtained in a batch electrodialytic cell operated for 14 days were as follows: Cu, 84%; Cr, 87%; and As, 95%.
AB - In this study, electrodialytic and dialytic techniques were used for Cu, Cr and As removal from 20-years out-of-service CCA-treated Pinus pinaster Ait. pole. The effect of applying direct current, as "cleaning agent", of up to 120mA was investigated. Focus was given to a parallel comparison with the performance of a pure dialytic experiment (without an external power supply) in order to reveal transport of charged particles induced solely by internal electrochemical potential differences in the system. Oxalic acid proved to be a more suitable pre-treatment solution than deionised water for wood chips incubation. Evaluation of the IARs of Cu, Cr and As showed that the rates of their appearance in the electrolytes were not linearly related to the current (except for Cr in the catholyte), mainly because of membrane retention. The maximum removal efficiencies obtained in a batch electrodialytic cell operated for 14 days were as follows: Cu, 84%; Cr, 87%; and As, 95%.
KW - Electrodialysis
KW - Electrokinetic remediation
KW - Heavy metals
KW - Solid waste
UR - http://www.scopus.com/inward/record.url?scp=0037019928&partnerID=8YFLogxK
U2 - 10.1016/S0304-3894(02)00063-8
DO - 10.1016/S0304-3894(02)00063-8
M3 - Article
C2 - 12169418
AN - SCOPUS:0037019928
SN - 0304-3894
VL - 94
SP - 147
EP - 160
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 2
ER -
