The waste material is transported by a vacuum conveyor to a receiving vessel. Once in the container, it is shredded, homogenized, and stored for later collection. The collection is usually made by a road tanker, with the transfer from the receiver to the tanker also carried out by a vacuum conveyor. Wet-waste conveying is split into lean and dense phases. The lean phase is characterized by high air flow and high velocity of the bulks. In the dense phase, the air flow and the bulk velocity is low and the differential pressure high.