The innovative sub-fluvial tunnel near Buenos Aires, part of Lot 3 of the Riachuelo Environmental Restoration Project has been filled by water from the river Plate. This is a sustainable development initiative financed by the World Bank to clean up Argentina’s Matanza-Riachuelo River Basin, one of the most polluted in the world.
At a length of 10.5 km and a depth of 40 m below the bed of the River Plate, the 4.3-m diameter tunnel will receive wastewater from the basin that has been treated at a new plant and diffuse it into the river at an average rate of 27 m3/sec. The innovative part of the tunnel is the series of 34 steel tubes called risers each at a diameter of a little less than one metre installed along the ceiling of the tunnel. The treated wastewater passes through the risers that reach up to the bed of the river.
The plant and accompanying pumping stations are being built by Webuild’s subsidiary, Fisia Italimpianti, and partner Acciona who have a 35% stake. The plant will be one of the biggest of its kind in the world. Once the entire project is completed, an estimated 2.3 million m3/gg of wastewater from the basin will be treated every day, improving the lives of more than four million people who live in the heavily industrialized area.
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