PhD student Eric Valdés from Universitat Autònoma de Barcelona continues with his six-month stay in Italy, collaborating with Italprogetti Spa & Università degli Studi di Firenze aiming at developing a mathematical model that can describe the dynamics of the partial autotrophic denitrification process occurring in a CSTR fed with nitrate and sulphide, as well as to predict nitrite accumulation for different influent conditions. During his stay, he has coincided with other RECYCLES researchers who were also working on modelling and database development.