Activated Sludge Settling Demonstration

A rather self-describing demonstration, but a good solid one. Simply take activated sludge and a settleometer (or any glass jar) to the talk. Show how zone settling "sweeps" the water clean as it settles.

Bring latex gloves, glasses, and a lab apron along to help demonstrate the potential hazards that wastewater plant employees are exposed to every day. Not to scare the students but to inform them.

Complete the demonstration by describing how the cleaned water is usually disinfected prior to discharge, and get some removal efficiency numbers to indicate how much cleaner it is leaving your plant than it was coming in.

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School Talk Ideas, Demonstrations and Lessons