Integrated M.S.W treatment plant – Messina

The plant design is developed in accordance to a public tender for the construction of
an integrated system for the M.S.W. management in the Municipality of Messina (CIG
55388378E1), which was issued by the Commissioner for the Waste Emergency in Sicily
(O.P.C.M. 9/7/2010 n. 3887 – D.L. n. 43/2013). The plant lay-out provides one mechanical
treatment line for the screening of M.S.W. with a capacity of 32.1 t/h, 12 hours/day. The
process-line layout is the following: a wide area for the storage of the incoming wastes, a
shredding and a double-stage screening (with holes from 130 to 80 mm).
This is aimed to separate the following materials:

• oversize fraction >130 mm, by which nonferrous metals (e.g. aluminium cans) and
  ferrous materials will be separated;
• oversize fraction 80÷130 mm, by which ferrous materials will be separated;
• underscreen fraction <80 mm, which must be processed with biological treatment.

The designed layout also provides the construction of a landfill with a capacity of 270.000
m³ which will be used for the final disposal of the fraction deriving from the mechanical
treatment, and the construction of a leachate treatment system, which is constituted by
an ultrafiltration and four-steps reverse osmosis sections for completely purifying the
wastewater.
The underscreen fraction deriving from the mechanical treatment will be processed within
aerobic biological tunnels, which are closed and air forced with blowers, in order to obtain
stable and dry materials which can be sent to disposal or recycled.
The buildings will be kept in constant depression in order to ensure the health of workers;
the air is recirculated within the aerobic tunnels to facilitate the biological process.
Lastly, the exhaust air will be treated with two scrubbers and a biofilter, and so treated
air can be given off into the atmosphere, since pollutant concentrations are reduced to
the levels set forth by law.