MilanoDepur: Nosedo Wastewater Treatment Plant (2003-2019)

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Nosedo Wastewater Treatment – The Plant

Characteristic Data of the Wastewater Treatment Plant


Location: via San Dionigi 90 - 20139 Milano
Architect: Prof. Gianni Braghieri
Environmental context work: Prof. Marco Prusicki
Companies involved in the planning and execution of the work:

  • O.T.V. S.A. Italian branch (later incorporated, today in Veolia Water Technologies Italia S.p.A.)
  • DEGREMONT S.p.A. (today Suez Treatment Acque S.p.A.)
  • BONATTI S.p.A.
  • UNIECO S.Coop.R.L. (later in
  • ITINERA S.p.A.


Total surface area involved: 40 ha (including the surrounding park)

Area occupied by the plant: 16 ha
Population served: 1,250,000 p.e.
Average flow rate treated in dry weather conditions: 5,000 l/sec
Maximum flow rate treated in wet weather conditions: 15,000 l/sec



The plant, which is located in the area named "Nosedo" and dominated by the Roggia Vettabbia irrigation system, is the last phase in a complex system that collects wastewater from the central and eastern part of the city of Milan, serving the Nosedo sewer outfall and the “Ampliamento Est” main sewer.


To the south, the most striking part of the plant as regards size is occupied by processing tanks sunken into the ground, in which the flows of wastewater, coming from the screening stage and the grit and grease removal chambers, are subjected to a biological treatment before reaching the final sections of sand filtration and disinfection.


At the end of the process, the purified water is returned to the irrigation system serving the surrounding countryside. The northernmost part of the plant, on the other hand, houses the entrance to the facility and the buildings dedicated to services and corporate hospitality.

Water line

Sewage streams are transferred to the plant through different main sewers, which merge to constitute the two flows to be purified originating from the intake works of Nosedo, Rogoredo, S. Arialdo, Ampliamento Est, S. Dionigi and Ripamonti. Both flows undergo a coarse screening, followed by a fine screening.After a grit and grease removal phase, the wastewater is pumped up for biological processing, which allows to remove the organic pollutants load (COD and BOD) and the content of other nutrient substances (nitrogen and phosphorous). This treatment includes the denitrification and oxidation-nitrification sections, followed by final sludge settling. In order to complete the biological treatment, systems for active sludge and mixed liquor recirculation are also present.

Subsequently, wastewater is filtered through sand filters, disinfected and, once purified, it is conveyed back into the existing hydrographical system: the Nosedo effluent, Roggia Vettabbia and Redefossi channels .

Inlet flow rate


Sludge line

Sludge processing basically consists of phases of stabilisation and reduction of the sludge volumes for disposal.


Air extraction and deodorisation

The processing facilities are fitted with an air extraction system connected with a deodorisation section, in order to remove unpleasant odours.



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