Why is secondary treatment often needed for sewage?
A)The dissolved organics are too high and lead to bacterial growth.
B)The solution is contaminated with dangerous bacteria.
C)There are too many dissolved inorganic compounds.
D)There are too many finely divided particles that need to be filtered.
E)none of the above

Question

Quizplus · Accepted Answer

Secondary treatment is often needed for sewage because the dissolved organics in the solution are too high and can lead to bacterial growth, which can have negative environmental impacts if not treated properly. Secondary treatment involves the use of biological or physical-chemical processes to remove these dissolved organic compounds and other contaminants from wastewater before it is discharged into the environment.

Why Is Secondary Treatment Often Needed for Sewage