Describe various sewage treatment methods.

Sewage treatment is a critical aspect of environmental health, as it aims to remove contaminants and pollutants from wastewater before it is discharged back into the environment. Various sewage treatment methods are employed to achieve this goal, each with its own advantages and limitations. Here, we'll discuss some of the common sewage treatment methods:

1. Primary Treatment:
   - Primary treatment involves the physical separation of large solids from wastewater. This is typically done through processes such as screening and sedimentation.
   - In screening, large objects like sticks, rags, and plastics are removed from the wastewater using screens or bars.
   - Sedimentation involves allowing the _________ ___ ______ ______ _______ _______ ______ __________ _________ ___ ______ ___.
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