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Σεμινάριο Dr. David Werner στο Τμήμα Χημείας

  • Στοιχεία επικοινωνίαςΧρυσή Καραπαναγιώτηemail:karapanagioti AT upatras.grΤηλ:2610996728

03.06.2009, Αίθουσα Σεμιναρίων Τμ. Χημείας

Την Τετάρτη 3 Ιουνίου 2009, ο Dr. David Werner (Λέκτορας Περιβαλλοντικής Μηχανικής από το Newcastle University) θα παρουσιάσει ένα σεμινάριο με τίτλο:

Assessing the effect of sorption kinetics on the fate of organic groundwater pollutants

Η ομιλία θα πραγματοποιηθεί στην αίθουσα σεμιναρίων του Τμήματος Χημείας(ισόγειο του Βορείου Κτιρίου Χημείας) στις 12:00.

Όσοι επιθυμούν να συναντηθούν με τον Dr. Werner, παρακαλώ να ενημερώσουν τη Χρυσή Καραπαναγιώτη 2610996728 ή karapanagioti@upatras.gr.

Abstract:

Groundwater pollutant fate and transport models accounting for sorption kinetics are computationally more demanding than those assuming local sorption equilibrium. We combine batch and column tests with modelling for a comparative assessment of different sorption kinetic models. For the relatively hydrophobic compound naphthalene, a model assuming local sorption equilibrium was unable to reproduce breakthrough curves in column studies with Canadian River Alluvium sediment which contains carbonaceous particles. Independent forward predictions of a first-order kinetic and two diffusion kinetic sorption models were in much better agreement with the experimental data. These models were fully calibrated with batch experiments and conservative tracer data. Predictions of a diffusion kinetic sorption model assuming concentration-independent sorption equilibrium performed equally well as a model version using the Freundlich isotherm. Both diffusion kinetic sorption models were superior to the first-order rate approach. We propose a criterion to determine the importance of intraparticle diffusion limited sorption on the compound transport based on the compound's sorption properties, the aquifer properties, and the scale of the process. High groundwater velocities in combination with a low sorption coefficient Kd and slow diffusion limited sorption kinetic rates are necessary conditions to justify the use of sorption kinetics in groundwater contaminant fate models for large scale simulations. Such conditions could be caused by the presence of a low amount of carbonaceous particles in aquifers with a high permeability.

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