What is the function of sewage lagoons?

The function of sewage lagoons is to treat and store water-carried waste products. These lagoons serve as a large, shallow basin designed to hold wastewater, allowing for the natural processes of decomposition and biological treatment to take place. The lagoon provides a controlled environment where bacteria and other microorganisms can break down organic matter found in sewage, thereby reducing contaminants and aiding in the purification of the water before it is released or further processed.

This treatment process involves several stages, including sedimentation, where solids settle at the bottom, and aerobic and anaerobic processes that help in reducing harmful pathogens and nutrients. Over time, the treated effluent can be safely discharged into the environment or reused, depending on regulatory standards.

Other options, like the storage of stormwater runoffs, groundwater from wells, or filtration of water from rivers and lakes, do not accurately describe the primary purpose of sewage lagoons, which focuses specifically on the management and treatment of water-carried wastes.