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This lecture covers the thermal treatments of waste, focusing on energy recovery and environmental impact. It discusses processes like pyrolysis, gasification, and incineration, emphasizing the recovery of heat energy and the reduction of CO2 emissions. Various technologies for heat recovery, such as turbo-generators and steam exchangers, are explained. The lecture also delves into the impact of waste treatments on the environment, including emissions, atmospheric impacts, and the management of residues. It explores the challenges and solutions related to the treatment of sewage sludge, phosphorus recovery, and carbon capture. The importance of material cycles, such as the separation and recycling of metals and phosphorus, is highlighted.