Decontamination of the Flix reservoir

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The Flix reservoir is located in the County of Ribera de Ebro in the Province of Tarragona, Catalonia, Spain.The first stage was the establishment of a protected enclosure by constructing a 1.3-kilometre long double wall to separate the work zone from the River Ebro course. The isolation is completed with the construction of secant pile wall on the right bank.The second stage is based on the extraction of some 960,000 cubic metres of sludge contaminated by accumulated metals, organochlorine compounds and radioactive elements that have penetrated down to 150 metres depth in the river bed. The sludge is extracted by ecological dredging and is then treated by the plants installed in the area.The treatment process consists of wet material classification in which they are separated in order to commence dehydration treatment of the silt.All the water extracted by dredging and the various processes, will be treated at the water purification plant before being returned to the protected enclosure. Finally, all the material will be transported to a landfill, specifically constructed for this purpose.The overall works include complementary actions, such as the installation of an emergency water supply for the townships located downstream on the River Flix and thus, prevent the risk of contamination and to protect the Sebes natural park, located on the bank opposite the factory.

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