NEWA-LIMA

The technology of managed groundwater recharge (MAR), which has been tried and tested in Germany, was introduced in Peru as a nature-based solution (NBS) and its potential for the cost-effective provision of high-quality service and drinking water in densely populated regions with water shortages was demonstrated. Two previously unused resources, winter runoff surpluses and treated municipal wastewater, is used for infiltration. The work builds on extensive research results and contacts from the BMBF-funded project TRUST.

A key aspect is the adequate treatment of municipal wastewater. As in many developing and emerging countries, wastewater in Peru has so far been discharged mainly without treatment and in the arid coastal regions it is also used for irrigation/food production. This results in high environmental pollution and health hazards. Reasons for this include the comparatively high energy costs of conventional technologies (e.g. activated sludge processes) and a lack of qualified operating personnel. In contrast, the trickling filter process envisaged in the project is much more energy-efficient and operationally stable. Various trickling filter systems were examined on site and optimal operating parameters were determined, which can serve as an example for further systems in Peru.

Of particular importance is the fact that both the trickling filter and the MAR technology are suitable for small, decentralised plants. The project thus serves as a reference for the whole of Peru (and neighbouring countries) for innovative wastewater treatment and service/drinking water production adapted to local conditions. In addition to the implementation of a pilot plant, an intensive transfer of knowledge within the framework of the planned project, including training courses on the topics of drinking water and wastewater treatment was carried out. In addition to the involvement of national water authorities, companies and universities, the project partner SEDAPAL in particular, as one of the largest water supply and wastewater disposal companies in South America, offers an effective multiplier both in terms of capacity development and further services and product offers.