Question

Name three systems for treating sewage before its flows out into water ways?

Answer 1

Answer:

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

Answer:

primary secondary and tertiary are the three system for treating sewage before its flows out into water ways .