The science of sedimentation and the first step of wastewater treatment.
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We often use chemicals, filters, and even gigantic colonies of bacteria to clean sewage on such a massive scale, but the first line of defense in the fight against dirty water is usually just gravity.
All the wastewater videos so far: https://youtube.com/playlist?list=PLTZM4MrZKfW8jvCLy9K0UzZb2C6yxU3p8
Errata: (1) At 6:16, the header should say “ALL PARTICLES SETTLE WHEN tD IS LESS THAN tL.”
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