The study aims to analyze and discuss the modifications of the physical and morphological characteristics of the contaminated sediments dredged in the Ravenna harbor after decontaminations treatments. To obtain adequate quality standards (as defined by ICRAM - APAT, 2007), the contaminated sediments were treated with different experimental techniques (soil washing and attrition cell). From the comparisons of the sediments’ characteristics before and after treatments, it appears that: sediments presenting the minor textural variations were only treated with soil washing that allows the separation of the sand fraction from the clay. The abrasion process, has only induced a slight increase of silt and clay clearly due to the abrasion of particles. The morphological changes of the particles due to the decontamination treatments have been observed using a Microscope Morphologi G3 Malvern and a digital optical microscope. Statistical analysis were performed to individuate the significant shape and dimensional parameters to describe the morphological alterations. The results highlight that the two treatments not causes a radical change of the particles morphology, though there are an alteration of the aspect ratio, circularity and intensity mean parameters but less the convexity parameter.

Textural and morphological changes of dredged sediments after treatment techniques

RODELLA, Ilaria;SIMEONI, Umberto;CORBAU, Corinne Sabine
2016

Abstract

The study aims to analyze and discuss the modifications of the physical and morphological characteristics of the contaminated sediments dredged in the Ravenna harbor after decontaminations treatments. To obtain adequate quality standards (as defined by ICRAM - APAT, 2007), the contaminated sediments were treated with different experimental techniques (soil washing and attrition cell). From the comparisons of the sediments’ characteristics before and after treatments, it appears that: sediments presenting the minor textural variations were only treated with soil washing that allows the separation of the sand fraction from the clay. The abrasion process, has only induced a slight increase of silt and clay clearly due to the abrasion of particles. The morphological changes of the particles due to the decontamination treatments have been observed using a Microscope Morphologi G3 Malvern and a digital optical microscope. Statistical analysis were performed to individuate the significant shape and dimensional parameters to describe the morphological alterations. The results highlight that the two treatments not causes a radical change of the particles morphology, though there are an alteration of the aspect ratio, circularity and intensity mean parameters but less the convexity parameter.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11392/2374672
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact