The influence of sediment properties and experimental variables on the efficiency of electrodialytic removal of metals from sediment
| Autor: | Tore Lejon, Kristine B. Pedersen, Lisbeth M. Ottosen, Pernille Erland Jensen |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Environmental remediation
0211 other engineering and technologies Mixing (process engineering) Pls 02 engineering and technology 010501 environmental sciences 01 natural sciences Sediments Chemometrics Metal Phase (matter) Chemical Engineering (miscellaneous) Organic matter Waste Management and Disposal 0105 earth and related environmental sciences chemistry.chemical_classification 021110 strategic defence & security studies VDP::Mathematics and natural science: 400::Chemistry: 440 Chemistry Process Chemistry and Technology Sediment Pollution Heavy metals VDP::Matematikk og Naturvitenskap: 400::Kjemi: 440 Environmental chemistry visual_art Particle-size distribution visual_art.visual_art_medium EDREKR |
| Zdroj: | Journal of Environmental Chemical Engineering. 5:5312-5321 |
| ISSN: | 2213-3437 |
| DOI: | 10.1016/j.jece.2017.10.031 |
| Popis: | Accepted manuscript version. Published version available at https://doi.org/10.1016/j.jece.2017.10.031. Accepted manuscript version, licensed CC BY-NC-ND 4.0. Chemometrics was used to determine the influence of sediment properties and experimental settings for the electrodialytic removal (EDR) of Cu, Pb and Zn from six harbour sediments from Greenland and Norway. A Projection onto latent structures (PLS) model revealed that the most important sediment properties for achieving acidification (lag-phase, pH > 4), necessary for desorbing and mobilising metals in the polluted sediments, were buffer capacity and grain size distribution. Higher stirring rate reduced the acidification time, stressing the importance of thorough mixing of the sediment suspension to achieve a fast and uniform acidification. PLS models were calculated to determine the influence of sediment properties on the removal of metals during EDR, which was observed to vary depending on the targeted metal and the stage of the remediation. In general, buffer capacity, grain size distribution, element composition and metal partitioning were important for remediation efficiency and are important parameters for determining optimal experimental settings. In the fast removal phase (final pH 2–4), organic matter as well as stirring rate had increasing importance indicating oxidation and release of metals at this stage. Understanding the influence of sediment properties is important for determining experimental settings in accordance with the phase of EDR. |
| Databáze: | OpenAIRE |
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