This lecture covers the direct dosage of powdered activated carbon (PAC) into biological tanks for organic micropollutant removal, the challenges and benefits of this process, and the implementation of PAC dosage at a wastewater treatment plant. It also discusses the characterisation of wastewater solids, including total solids, total volatile solids, and screenings production. Furthermore, it explores the screening of wastewater, the handling of screenings, and the removal of grit and grease from wastewater. The lecture concludes with an outlook on future developments in wastewater engineering.