The laboratory of chemical and environmental engineering (LEQUIA) is a research group of the University of Girona (UdG) devoted to the development of eco-innovative water solutions. LEQUIA is part of the Institute of the environment (IMA) and a consolidated research group integrated in the TECNIO network of the Catalan Government. The research activity of the group involves several national and international R&D projects as well as technology transfer with public and private organizations. The main research lines are: i)Design, operation and control of advanced processes for biological wastewater treatment; ii)Valorization of resources within the water-energy nexus; iii) Environmental decision support systems; and iv)Advanced adsorption/oxidation processes to treat gas and liquid effluents. LEQUIA has a team of 40 people including professors, post-docs and PhD students, as well as technical and management staff.