Expected Results

1) Complete decontamination of dredged polluted harbour sediments from heavy metals and hydrocarbons: 80% removal for Cd, Hg and Pb, and up to 95% abatement for Ni, Zn, As, Cu and PAH, resulting in full compliance with legislation.

2) Reduction of volume by the dewatering action of the innovative technology: the water moves towards the negatively charged cathode for electro-osmosis, leading to a reduction of the 50% of the total sediment volume; subsequent decrease of the volume to be stored in long-shore CDF, doubling its service life.

3) Solution of environmental issues related to contaminated sediment management: instead of sending non-compliant sediments to relative hazardous waste landfills or of dumping them at the open sea, EKR technology will allow complete decontamination of harbour sediments and beneficial re-use. This will result in a 100% saving on long distance sea/land transport of sediments, and reduced air and water pollution. Sediments will be – disposed in a long-shore CDF that could be converted either into a port industrial/commercial facility or into a recreational area – re-used for habitat restoration/enhancement or beach nourishment, aquaculture activities, parks and recreation, forestry, agriculture and horticulture, construction and industrial use and so on, with a substantial reduction of overall projects costs. The expected economic impact of the new sediment management for construction and maintenance works will be of at least 15 million € on triennial basis, only taking into account the Livorno Port Authority 2010-2012 Operative Plan. Furthermore, compared to previous EK applications and experiments, the energy cost will be reduced of 70%. Indeed, a substantial amount of the electrical energy is used to get rid of Na and Cl ions before the other ions are being mobilized; a preliminary action will lead to an accelerated Na and Cl reduction prior of EKR application in order to abate salinity, thus reducing energy consumption.

Sediment ElectroKinetic REmediation Technology for heavy metal pollution removal

by Bliss Drive Review