The Final Step of Sewage Treatment Before Release into the Environment

Question

The final step of sewage treatment before release into the environment is ________.
A)sludge digesting
B)skimming
C)filtration
D)chlorination
E)aeration

Accepted Answer

Chlorination is the final step of sewage treatment and involves the addition of chlorine to disinfect the treated water before it is released into the environment. This helps to kill any remaining bacteria or pathogens in the water to make it safe for human and environmental health. Sludge digesting, skimming, filtration, and aeration are all earlier steps in the sewage treatment process.