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📘 How does a sewage treatment plant clean water?

Trace wastewater through screens, settling tanks, microbes, disinfection, and sludge handling.

lessons

~20 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Influent
Screening
Grit
Primary settling
Activated sludge
Secondary clarifier
Nutrients
Disinfection
Sludge
The complete plant

Questions this course answers

What does preliminary screening remove?

Screens catch large solids that could clog or damage downstream equipment.

Why is grit removed early?

Dense inorganic particles are abrasive and can settle where they should not.

What do activated-sludge microbes do?

Microbial communities metabolize organic pollutants and lower oxygen demand.

Why is some secondary sludge returned to aeration?

Return activated sludge keeps useful organisms in the biological process.

What is the purpose of final disinfection?

Disinfection targets pathogens after earlier stages have reduced solids and organic matter.

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