The LIFE ULISES project aims to shift the conventional wastewater treatment plants (WWTPs) into new urban biorefineries, by applying a set of innovative low-cost technologies that allow the production of valuable resources, such as biofuels, fertilizers and quality water suitable for irrigation. Moreover, the project seeks to reduce energy consumption and the carbon footprint associated with water treatment, by increasing the efficiency of the conventional wastewater treatment thanks to the integration of different technologies in each of its main lines (water, gas and sludge).