In the present study a chemical washing process was applied to dredged sea and river sediments. Five chelating agents (ethylenediaminetetraacetic, nitrilotriacetic, citric, [S,S]-ethylenediaminedisuccinic and oxalic acids), three surfactants (sodium dodecyl sulphate, cetylpyridinium chloride and saponin Q), as well as monobasic potassium phosphate were used as the extracting agents. The effect of sonication was also tested as a conditioning step to couple with chelant-based extraction. The extraction experiments were performed in both single and multiple washing stages. The results indicated that, for given experimental conditions, the remediation efficiency was strongly dependent on the specific contaminant under concern, with contaminant speciation and distribution in the solid matrix as well as affinity for the extracting agent playing a major role in the decontamination process. In this respect, the study also showed that in the presence of multiple contaminants the use of a single extraction agent is not sufficient to attain adequate quality levels for the treated sediment.

Assisted Washing for Heavy Metal and Metalloid Removal from Contaminated Dredged Materials / Polettini, Alessandra; Pomi, Raffaella; G., Calcagnoli. - In: WATER AIR AND SOIL POLLUTION. - ISSN 0049-6979. - 196:1-4(2009), pp. 183-198. [10.1007/s11270-008-9767-z]

Assisted Washing for Heavy Metal and Metalloid Removal from Contaminated Dredged Materials

POLETTINI, Alessandra;POMI, Raffaella;
2009

Abstract

In the present study a chemical washing process was applied to dredged sea and river sediments. Five chelating agents (ethylenediaminetetraacetic, nitrilotriacetic, citric, [S,S]-ethylenediaminedisuccinic and oxalic acids), three surfactants (sodium dodecyl sulphate, cetylpyridinium chloride and saponin Q), as well as monobasic potassium phosphate were used as the extracting agents. The effect of sonication was also tested as a conditioning step to couple with chelant-based extraction. The extraction experiments were performed in both single and multiple washing stages. The results indicated that, for given experimental conditions, the remediation efficiency was strongly dependent on the specific contaminant under concern, with contaminant speciation and distribution in the solid matrix as well as affinity for the extracting agent playing a major role in the decontamination process. In this respect, the study also showed that in the presence of multiple contaminants the use of a single extraction agent is not sufficient to attain adequate quality levels for the treated sediment.
2009
arsenic; chelating agents; dredged sediment; heavy metals; sediment washing; surfactants
01 Pubblicazione su rivista::01a Articolo in rivista
Assisted Washing for Heavy Metal and Metalloid Removal from Contaminated Dredged Materials / Polettini, Alessandra; Pomi, Raffaella; G., Calcagnoli. - In: WATER AIR AND SOIL POLLUTION. - ISSN 0049-6979. - 196:1-4(2009), pp. 183-198. [10.1007/s11270-008-9767-z]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/226695
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