The document discusses wastewater treatment and recycling, specifically the fate and transport of contaminants discharged into rivers. It describes how pollutants undergo various processes like transport, phase transfer, and transformation after being discharged into the natural environment. These include advection, diffusion, dispersion, sorption, volatilization, biotic and abiotic degradation. The document then focuses on natural purification processes in rivers, which rely on dilution, sedimentation, filtration, adsorption, sediment transport, hydrolysis, and biodegradation to reduce pollution loads. Factors like temperature, sunlight, hydrography, river bed nature, and biota present can affect the natural attenuation of contaminants in rivers.

Week 4 - Concept of Natural Purification and Engineered Treatment of Pollutants in Wastewater - LM PDF

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