The rapid social and economic growth of the city of Lima has coincided with a significant increase in population and the consolidation of urban areas, which has had a direct influence on the quantity of wastewater generated and its treatment.
The Peruvian State, through Sedapal (Servicio de Agua Potable y Alcantarillado de Lima) has undertaken a number of large infrastructure construction projects to eliminate the discharge of raw wastewater into the natural environment. One of the most important of these projects is the Taboada WWTP, which provides a solution to the sanitation problema associated with the discharge of completely untreated wastewater into the sea and into the Rímac River, and represents the beginning of the decontamination of the Peruvian Sea. Prior to the commissioning of this plant, only 16% of wastewater generated in Lima was treated in a number of conventional plants as well as oxidation ponds.
In August 2009, state-owned company Proinversión awarded the BOT contract for the design, construction, operation and maintenance for a period of 25 years of the Taboada wastewater treatment plant in Lima (Peru) to the parent company of the ACS Group in the industrial area. ACS, in turn, subcontracted all design, construction, commissioning and operation work to its Tedagua subsidiary, which belongs to the Cobra Group.
Tedagua has invested €133 million in the construction of the plant and total investment over the 25 years of plant operation may well amount to €650 million.
The Taboada WWTP is the largest wastewater treatment facility built to date in South America. The effluent from the plant complies with the parameters set out in the General Water Act – Class VI, related to bodies of water in coastal areas.
With an average flow of 14 m3/s and a maximum flow of 20.3 m3/s, the plant serves a population of over 4.7 million, representing 56% of the population of Lima and Callao and 72% of the wastewater generated in the two cities.