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

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Abstract

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. (C) 2014 Elsevier B.V. All rights reserved.
Original languageEnglish
JournalJournal of Hazardous Materials
Volume283
Pages (from-to)712-720
ISSN0304-3894
DOIs
Publication statusPublished - 2015

Keywords

  • Harbour sediments
  • Electrodialytic remediation
  • Electrokinetic remediation
  • Heavy metals
  • Multivariate modelling

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