Due to the scarce water flowing, harbour areas are often characterised by high material deposition and dredging operations have to take periodically place in order to preserve functionality. Moreover, the presence of industrial activities promotes the deposition of contaminants that eventually accumulate in sediments. Contaminated sediments pose a severe risk to human health and the environment both for their direct impact on aquatic life (especially benthic organisms) and for being a source of contamination for water bodies, especially during dredging operations, which cause re-suspension and diffusion of sediments pollutants. In this work, sediments have been collected in a harbour area characterised by strong organic and inorganic contamination. After characterisation, sediments have been treated with lime. Tests have been carried out leaching the contaminated sediments with solutions at different concentration of lime for duration of 1 day up to 20 days. Some pre-treatments have been considered. In particular, sieving and flotation tests have been performed to concentrate the contaminants in smaller volume of sediments. In order to assess the efficiency of lime treatment on contaminated sediments, the BCR three-steps sequential extraction procedure has been carried out on the products of the leaching tests in order to determine metal content in fractions with different levels of bioavailability. Results highlighted the effectiveness of lime as an economic agent for the treatment of contaminated sediments. The availability of metals can be changed by lime addition at proper concentration contributing to sediment stabilization.
Metal speciation in contaminated marine sediments after liming / Bambara, W.; DE PROPRIS, L.; Gabellini, M.; Gente, Vincenzo; Geraldini, S.; LA MARCA, Floriana; Massacci, Paolo; Migliavacca, E.. - ELETTRONICO. - (2005), pp. 1153-1162. (Intervento presentato al convegno Ninth International FZK/TNO Conference on Contaminated Soil tenutosi a Bordeaux, France nel October 3-7, 2005).
Metal speciation in contaminated marine sediments after liming
GENTE, Vincenzo;LA MARCA, Floriana;MASSACCI, Paolo;
2005
Abstract
Due to the scarce water flowing, harbour areas are often characterised by high material deposition and dredging operations have to take periodically place in order to preserve functionality. Moreover, the presence of industrial activities promotes the deposition of contaminants that eventually accumulate in sediments. Contaminated sediments pose a severe risk to human health and the environment both for their direct impact on aquatic life (especially benthic organisms) and for being a source of contamination for water bodies, especially during dredging operations, which cause re-suspension and diffusion of sediments pollutants. In this work, sediments have been collected in a harbour area characterised by strong organic and inorganic contamination. After characterisation, sediments have been treated with lime. Tests have been carried out leaching the contaminated sediments with solutions at different concentration of lime for duration of 1 day up to 20 days. Some pre-treatments have been considered. In particular, sieving and flotation tests have been performed to concentrate the contaminants in smaller volume of sediments. In order to assess the efficiency of lime treatment on contaminated sediments, the BCR three-steps sequential extraction procedure has been carried out on the products of the leaching tests in order to determine metal content in fractions with different levels of bioavailability. Results highlighted the effectiveness of lime as an economic agent for the treatment of contaminated sediments. The availability of metals can be changed by lime addition at proper concentration contributing to sediment stabilization.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
