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Modena physicochemical treatment plant

Via Cavazza 45, Modena

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The Modena physicochemical treatment plant (Area 2 - via Cavazza, 45) is used for the treatment of hazardous and non-hazardous special liquid waste.

Page updated 26 August 2015

    Treatment capacity
    58,000 tonnes/year (D9 authorised limit)
    Types of waste/wastewater accepted
    WTE process wastewaters; landfill leachates; washing solutions; contaminated rainwater

    The incoming liquid waste is stored in two semi-underground reinforced concrete tanks with a capacity of 520 m3 each. One is for receiving the process waters from the adjacent waste-to-energy plant and inorganic waste via a pipe and the other is for receiving and storing leachates.

    The physicochemical treatment takes place through the following stages:

    • mixing and equalising of the WTE wastewaters and liquid waste delivered in tankers by external customers;
    • checking the pH by adding sulphuric acid and selective abatement of bivalent metals by adding a sequestering reagent;
    • coagulation by adding ferric chloride;
    • first neutralisation with milk of lime and precipitation of heavy metals;
    • selective abatement of bivalent metals by adding a sequestering reagent;
    • coagulation of metal hydrates by adding an anionic polyelectrolyte;
    • static decantation and separation of the solid and liquid phases;
    • filtration in quartzite filters;
    • direct transfer to the adjacent Modena city purification plant.

    The storage and treatment tanks have aspiration systems; the captured air is treated before being released into the atmosphere by means of an activated carbon system.

    The overall process makes it possible to reduce heavy metals, suspended solids and phosphates. Sludge from the clariflocculation process is sent to two thickeners, and then to the filter-pressing section for final dehydration. This last stage produces sludge with 50% dry matter and a clarified liquid which returns to the plant for treatment.

    The sludge produced is stored in roll-off containers and sent to authorised landfills for disposal.

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