The CSS production line is fed by three different flows from two separate plant sections.
- The first flow - SOV1: under-screening with a size greater than 80 mm at the outlet originating from the pre-treatment system of the OFMSW (Organic Fraction of Municipal Solid Waste) that has not yet undergone digestion.
- The second flow - SOV2: underscreening materials of more than 80 mm deriving from the sorting of processed material through composting that underwent bi-oxidation accellerated in two stages: the first in a forced aeration bio-tunnel; the second on an similarly aerated floors, for a total treatment time of 25-29 days.
- The third flow - SOV3: under-screening materials of more than 40 mm delivering from the sorting of material exiting the bio-tunnels belonging to the new aerobic composting section.
The new line, built by PAL, can be fed through the existing line (SOV3) or through a special loading hopper using a wheel loader (SOV1 and SOV2). The plant was designed to have a certain degree of flexibility thanks to the bypass system, that allows the better manage any downtime due to maintenance.