AP Environmental Sciencemediummcq1 pt
Which sewage-treatment stage removes pathogens?
A.Disinfection (often chlorination or UV) after treatment
B.Primary settling
C.Secondary aeration
D.Screening
Explanation
Core Concept
The final disinfection step kills remaining bacteria and viruses before discharge — protecting downstream swimmers.
Correct Answer
ADisinfection (often chlorination or UV) after treatment
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