| http://www.w3.org/ns/prov#value | - In this condition, the high specific weight materials contained in the heavy fraction, such as PVC and PET, precipitate almost immediately, while the other materials, belonging to the heavy fraction and having specific weights close to that of water, for example polystyrene, are dragged, during their precipitation, by the stream flow and deposit onto the tank bottom in areas well distinct from the
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