The Ribadeo WWTP is a wastewater treatment plant using a system of sludge activated by prolonged aeration at low load and simultaneous stabilization of sludge, including nutrient removal through nitrification-denitrification processes and chemical precipitation of phosphorus. With the Ribadeo WWTP we have contributed to: • Optimising the different purification processes, applying the latest technologies. • Reducing energy consumption. • Ensuring purification yields. • Carrying out environmental management of sludge, waste and by-products generated in the treatment processes. • The cleaning of the Ría de Ribadeo, by having a submarine emissary.