Chillon Water Treatment Plant

"Delivering Potable Water in Peru"

What's the most effective way to manage the construction of a water treatment plant that is bringing potable water for the first time to a suburb in Lima, Peru?

That was MWH's responsibility on the US $65 million Chillon River Basin and Water Treatment Plant. The project is the first municipal water project ever issued under a private investment initiative for private concession in Peru.

Lima's state-run water utility, Sedapal, awarded the joint venture Consorcio Agua Azul a 27-year concession to optimize the hydro resources of the Chillon River Basin. The joint venture, comprised of Imperiglo-Acea-Cosapi, won the concession based on the lowest cubic-meter/second (cms) rate of water sold to Sedapal.

Two Phase Project

MWH provided construction management services for the two-phase project. The first phase included the installation of 28 deep-water wells on the Chillon River Basin.

These wells are used during the dry season (June - November) to produce 1 cm of water. During the rainy season (December - May), the plant has a Water Intake Structure to collect the water from the river.

The second phase included the construction of a 2.5 cms Water Treatment Plant. The facility has two equalization ponds to receive the water flow from the intake structure. Also featured are flocculation tanks, sand filter basins and a chlorine tank.

An extensive network of more than 65 km of Ductile Iron Pipe forms a portion of the infrastructure.

Best of all, this pipe network has allowed potable water to be delivered for the first time in 75 years to Ancon, the northernmost suburb of Lima.