All of the following are used in secondary sewage treatment EXCEPT
A) trickling filters.
B) aeration.
C) sludge granules or floc formation.
D) activated sludge.
E) anaerobic digestion.

Question

Quizplus · Accepted Answer

Anaerobic digestion is typically used in the treatment of sludge in primary or tertiary treatment, not in secondary sewage treatment. Secondary treatment primarily involves aerobic processes.

All of the Following Are Used in Secondary Sewage Treatment