The drying process of sludge from wastewater treatment plays a crucial role in preparing for its energy recovery. The study of drying kinetics is paramount during this pretreatment phase as it allows for an understanding of the temporal mechanisms involved in moisture removal from the material. In this regard, the present work focuses on the study and analysis of convective drying kinetics at four different temperatures (70, 80, 90, and 100 ℃) and four distinct thicknesses (2, 3, 4, and 5 cm). Additionally, the determination of the effective diffusion coefficient (Deff) and the activation energy (E) is carried out. The results indicate that the moisture diffusion coefficient increases with the rise in temperature and thickness, ranging between 7.09 × 10–8 and 3.34 × 10–7 m2.s−1. Furthermore, the average activation energy required to dry this sludge is estimated to be around 29.02 kJ/mol. These findings are essential for enhancing the drying process and increasing its efficiency, particularly given that the studied thicknesses are more representative of real drying conditions.