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Ravenna Landfills for hazardous and non-hazardous special waste

S.S. 309 Romea 2.6 km, Ravenna

  • 1 / 1   Landfills for hazardous and non-hazardous special waste

The Landfills are authorised for the disposal of hazardous and non-hazardous special waste.

Page updated 26 August 2015

    Landfill type
    Hazardous and non-hazardous special waste
    Operational status
    Section 3 is post-operational (capacity was reached in 2008), Sections 1/2 are operational but are nearing capacity, Section 4 is operational
    Envisaged saturation:
    Permitted acceptable waste
    Sections 1/2 can accept exclusively waste that has been pre-treated in the Storage and Pre-Treatment Centre. In Section 4, a limitation has been placed on waste coming from outside the region (10% of the total authorised capacity)
    Overall capacity
    1,110,000 m, of which 420,000 m relating to Section 4
    Placement type
    Layers approximately 3 m high, broken down into cells of approximately 672 m2

    The waste is arranged in strata and the horizontal surface is compacted so as to prevent instability and favour the gradual recovery of the area. Considering the type of waste disposed of, there is no systematic daily covering. Rather, that activity is carried out exclusively for specific waste categories:

    • powdery waste subject to dispersion in the wind,
    • waste that emits bothersome odours and/or subject to the proliferation of insects and parasites,
    • waste consisting of mineral fibres,
    • in addition to, for safety reasons:
    • waste potentially subject to spontaneous combustion, in compliance with the provisions of point 2.10 of Attachment 1 of Legislative Decree 36/03.

    Artificial mineral fibres may be disposed of in the Landfills in a special, exclusively dedicated cell.
    The currently operational Landfill Section 4 comprises six tanks subdivided into two sectors with an overall capacity of approximately 420,000 m3.

    The leachate, generated by the infiltration of rainwater into the landfill site, is collected on a regular basis and then treated.
    The drainage system, positioned above the waterproof tank liner, comprises a drainage network of micro-perforated HDPE pipes and an extraction system to carry the leachate in a pipe connected to a system of storage tanks. It is subsequently sent to the Herambiente physicochemical treatment plant in the Section, or to authorised outside plants, by tankers or directly through pipes.

    The types of waste disposed of in the Landfills, most of which is not biodegradable, generate a negligible amount of biogas. Therefore, there are no systems for capturing and disposing biogas.
    A two-stage oxidation membrane (also referred to as an oxidation biofilter, a biocover or a passive methane oxidation barrier - PMOB) installed on an experimental basis on top of Landfill Section 3 is monitored periodically. As expected, the quantities of biogas detected are currently very low.

    The Landfills are equipped with the most advanced bottom isolation systems using materials (compacted clay, inert drainage material) and tools (liners, covers, geogrids). On the bottom liner a drainage network of micro-perforated HDPE pipes intercepts the leachate, which is then suitably treated.
    Landfill Section 4 has a double composite liner, which in part (primary liner) acts as an artificial linear (compacted mineral barrier and geomembrane) and in part (secondary liner) acts as a complement to the natural barrier (second 1 m thick layer of clay and geomembrane). A polypropylene geotextile has been placed over the upper geomembrane to protect it from possible breakage. Finally, on top of the seal, there is a gravel drainage layer at least 50 cm thick. In summary, the barrier system consists of the following elements, starting from the upper layers:

    • washed gravel drainage layer;
    • protective geotextile layer;
    • upper waterproof HDPE geomembrane;
    • primary waterproof mineral barrier;
    • lower waterproof HDPE geomembrane;
    • secondary waterproof mineral barrier Final layout.

    Covering of the top portion takes place in two separate phases:

    • Temporary Covering: Comprising a 30 cm thick regulation layer consisting of earth material to be placed when deliveries are completed for each sector. The temporary covering of the landfill embankments is gradually completed as the waste is placed underground. When the two authorised landfill sections have reached capacity, the landfill is then covered temporarily before the final covering is put into place.
    • Final Covering or Capping: This involves installing a multi-layer barrier system above the regulation layer, comprising the following elements from bottom to top:
    • leachate drainage layer located above the waste along the outside perimeter of the embankments,
    • barrier with low hydraulic conductivity (HDPE geomembrane),
    • Bentonite geocomposite (only on the top area),
    • rainwater drainage layer,
    • geocomposite for reinforcement (only on the embankments),
    • topsoil,
    • surface geosynthetic material for erosion control.

    The environmental matrices and emissions monitored as environmental surveillance of the potential impact of the management of the Landfills are:

    • rainwater;
    • groundwater;
    • surface water (receiving vessels);
    • leachate;
    • atmospheric particulate;
    • monitoring of biogas composition (only for Landfill Section 3);
    • landfill emissions (only for Landfill Section 3);
    • air quality (Odorous substances);
    • monitoring of leachate explosiveness on the management network.
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