CSO - Combined sewer overflow - IRIDRA's solutions
For the combined sewer overflows (CSOs), IRIDRA proposes the following technical solutions
Classical constructed wetlands
- Constructed wetlands with vertical subsurface flow (VF)
- Constructed wetlands with free water surface (FWS)
- Hybrid constructed wetlands (VF + FWS)
IRIDRA's experience
Among the most representative examples of IRIDRA's experience in this field are following reported.
Combined sewer overflow of Gorla Maggiore (VA - Italy): The "Water Park" Yearly treated volumes of first flush
150.000 m3/year
Chosen Nature-based solution
VF + FWS
Peculiarity
Multipurpose nature-based solution integrating different ecosystem services within the new "Water Park" of Gorla Maggiore: water quality improvement of Olona river, flood mitigation, recreational site, and biodiversity increase. Case study of EU funded project OpenNESS.
Year of realization
2012
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Combined sewer overflow upstream the WWTP of Merone (CO - Italy) Yearly treated volumes of CSOs
564.000 m3/year
Chosen Nature-based solution
FBA™ + FWS
Peculiarity
First aerated constructed wetland for CSO treatment in Italy, and among the first in the World
Year of design
2015
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Combined sewer overflow upstream the WWTP of Carimate (CO - Italy) Yearly treated volumes of CSOs
515.000 m3/year
Chosen Nature-based solution
VF + FWS
Peculiarity
Nature-based solution integrating also intervention for environmental education and river restoration. Particularly, the project implements a restored riparian zone of Seveso river and a didactic wood area
Year of design
2015
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Combined sewer overflow of Villaguardia (CO - Italy) Treated first flush flow rate
Up to 140 l/s
Chosen Nature-based solution
VF + FWS
Peculiarity
Multipurpose nature-based solution integrating different ecosystem services: water quality improvement, recreational site, and biodiversity increase.Year of design
2015
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Combined sewer overflow of Carugo (CO - Italy) Treated first flush flow rate
Up to 40 l/sChosen Nature-based solution
VF
Year of design
2016
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Combined sewer overflow of Mozzate (CO - Italy) Treated first flush flow rate
Volumes higher than the 2050 m3 captured by the first flush tankChosen Nature-based solution
FWS
Peculiarity
Multipurpose nature-based solution integrating different ecosystem services: water quality improvement of second flushes, flood mitigation, recreational site (bicycle lane, birdwatching), and biodiversity increase.
Year of realization
2016
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Combined sewer overflow of Capiago Intimiano (CO - Italy) Treated volumes of CSOs
up to 130 m3 per CSO event
Chosen Nature-based solution
VF + FWS
Peculiarity
Multipurpose nature-based solution integrating different ecosystem services: water quality improvement, flood mitigation, recreational site, and biodiversity increase.
Year of design
2016
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Combined sewer overflow upstream the WWTP of Mariano Comense (CO - Italy) Yearly treated volumes of CSOs
10.000 m3/yearChosen Nature-based solution
FBA™ + FWS
Peculiarity
Pilot plant to optimise aerated wetland for combined sewer overflow treatment.
Year of realization
2020
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