Question

what process does sewage treatment involve?​

Answer 1

Sewage treatment generally involves three stages, called primary, secondary and tertiary treatment. Primary treatment consists of temporarily holding the sewage in a quiescent basin where heavy solids can settle to the bottom while oil, grease and lighter solids float to the surface.

Answer 2

Cleaning ,Processing ,Land filling ,separating degradable waste from non degradable waste ,composting ,etc