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This lecture takes you on a tour of a wastewater treatment plant, showcasing the various stages of treatment such as pre-treatment, primary treatment, biological treatment, and more. The instructor and an engineer guide you through the plant, explaining the importance of each step and the challenges faced in treating wastewater. From the initial removal of carbon and nitrogen to the final disinfection process, you will learn about the intricate systems and technologies involved in ensuring clean water output. The lecture also touches on the impact of COVID-19 on wastewater composition and the financial aspects of operating a treatment plant.