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.
Errata: (1) At 6:16, the header should say "ALL PARTICLES SETTLE WHEN tD is less than tL."
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Source: https://www.youtube.com/watch?v=U6fBPdu8w9U
Producer/Writer/Host: Grady Hillhouse
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