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AP® Environmental Science

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Moderate

Sewage Treatment: Aeration Tank

APES-BGORYX

In a sewage treatment facility, the function of the aeration tank is to

A

allow microorganisms to digest remaining dissolved solids in the water after they pass through the secondary clarifier.

B

provide oxygen to the water before it is discharged.

C

break down​ large particles of waste that will float to the surface to be removed during the next step in treatment.

D

remove harmful microorganisms by decreasing dissolved oxygen levels.

E

provide photosynthetic microorganisms dissolved oxygen to facilitate the digestion of dissolved solids.