In water reclamation facilities, sewage is cleaned using a few methods. First, it is physically filtered by screens that take out twigs, rocks, and trash. Primary treatment of wastewater involves allowing the sewage to settle so that all the greases float to the top and particles sink to the bottom. The greases are then skimmed off and the particles are removed. The clarified water moves on to secondary treatment, which is a biological process where microbes are used to degrade any remaining organic materials. Tertiary treatment aims to kill pathogenic bacteria in the water, and chlorine is commonly used to achieve this. Ultraviolet radiation treatment can also be used. After all these steps are performed, the resulting water is discharged into a natural body of water like a river.
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