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Research & development
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Classification of sediments and management
options are related to their level of toxicity and
contamination. Usually three different colours are
adopted to show with “green”, “yellow” and “red”
sediment dredged material that can be respectively
used for beach nourishment, or disposed within
Confined Disposal Facilities and landfill. In the
present paper, a new “dark green” colour is
adopted for sediment that shows contamination
values between the quality standard suggested
for coastal water directive (DM260/2010) and the
contamination standard indicated by column A of
Att. 5 of D.Lgs 152/2006. A schematic management
option scheme is reported in Figure 5.
At the end of analytical investigation, the material 8. Checks of bottom depths after excavation;
has been classified by identifying exceedances of
the thresholds for green areas and public housing.
From available information a preliminary draft has
been prepared, taking into account the outcome of
various scenarios resulting from a more detailed
environmental characterization. A detailed review
of technologies available for the remediation of
contaminated sediments has been conducted,
and some of them were considered eligible for
the case study. In the present paper, all the steps
required to implement the dredging operations
were considered, as follows:
1. Boundaries of the harbour;
2. Preparation of the characterization plan;
3. Sample collection;
4. Analytical investigations;
5. Processing of the obtained data;
6. Dredging and transport;
7. Storage and handling;
9. Dredging of hot spots;
10. Cost-benefit analysis of different scenarios for
sediment reuse.
41EAI Energia, Ambiente e Innovazione 4/2015