Multivariate methods for evaluating the efficiency of electrodialytic removal of heavy metals from polluted harbour sediments

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Multivariate methods for evaluating the efficiency of electrodialytic removal of heavy metals from polluted harbour sediments

Pedersen, Kristine Bondo / Kirkelund, Gunvor M. / Ottosen, Lisbeth M. / Jensen, Pernille E. / Lejon, Tore

Chemometrics was used to develop a multivariate model based on 46 previously reported electrodialytic remediation experiments (EDR) of five different harbour sediments. The model predicted final concentrations of Cd, Cu, Pb and Zn as a function of current density, remediation time, stirring rate, dry/wet sediment, cell set-up as well as sediment properties. Evaluation of the model showed that remediation time and current density had the highest comparative influence on the clean-up levels. Individual models for each heavy metal showed variance in the variable importance, indicating that the targeted heavy metals were bound to different sediment fractions. Based on the results, a PLS model was used to design five new EDR experiments of a sixth sediment to achieve specified clean-up levels of Cu and Pb. The removal efficiencies were up to 82% for Cu and 87% for Pb and the targeted clean-up levels were met in four out of five experiments. The clean-up levels were better than predicted by the model, which could hence be used for predicting an approximate remediation strategy; the modelling power will however improve with more data included.

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Dokumentinformationen

Titel :

Multivariate methods for evaluating the efficiency of electrodialytic removal of heavy metals from polluted harbour sediments

Beteiligte:

Pedersen, Kristine Bondo (Autor:in) / Kirkelund, Gunvor M. (Autor:in) / Ottosen, Lisbeth M. (Autor:in) / Jensen, Pernille E. (Autor:in) / Lejon, Tore (Autor:in)

Erschienen in:

Journal of Hazardous Materials ; 283 ; 712-720

Erscheinungsdatum :

2015

Format / Umfang :

9 Seiten, 33 Quellen

ISSN :

0304-3894

DOI :

https://doi.org/10.1016/j.jhazmat.2014.10.016

Medientyp :

Aufsatz (Zeitschrift)