In Which Phase of Sewage Treatment are Trickling Filters Sometimes

Question

In which phase of sewage treatment are trickling filters sometimes used?
A)primary treatment.
B)secondary treatment.
C)tertiary treatment.
D)quaternary treatment.

Accepted Answer

Trickling filters are commonly used in the secondary treatment phase of sewage treatment. In this phase, bacteria on a filter media break down organic matter in the wastewater as it trickles over them. This process removes more contaminants and helps to further clarify the wastewater before it moves on to tertiary treatment.