The final treatment of sewage before release into the environment is

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Chlorination is the final treatment of sewage before release into the environment as it helps to kill any remaining disease-causing microorganisms in the water. This is an important step to ensure that the released water does not pose a health risk to humans or animals that may come into contact with it. Sludge digesting, skimming, filtration, and aeration are all important steps in the sewage treatment process, but they typically occur earlier on and are not the final treatment step.

The Final Treatment of Sewage Before Release into the Environment