?

AP® Environmental Science

Free Version

Upgrade subject to access all content

Difficult

Sewage Treatment Disinfection Methods

APES-GOG1EF

By CK-12 Foundation (File:High_School_Engineering.pdf, page 75) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons

The diagram above represents the process of sewage treatment.

All of the following are commonly used in the final treatment stage before being released into a stream EXCEPT

A

ozone.

B

ultraviolet light.

C

chlorine gas.

D

sodium hypochlorite.

E

hydrochloric acid.