This lecture covers different types of membranes used in fluid flow processes, such as isotropic and anisotropic membranes made of ceramics, polymers, and metals. It also discusses strategies to prevent and manage membrane clogging, including adjusting operating conditions, chemical cleaning, and retrofiltration. Additionally, the lecture explores the mechanisms of air filtration, focusing on the efficiency of filters based on fiber diameter and particle size. The session concludes with an overview of sedimentation and settling processes in separating solid and liquid phases.