Sewage Treatment | Microbes in Human Welfare | Biology | Khan Academy

In this video, we find out what really happens after you flush down last night's dinner. We discover the importance of microbes in sewage treatment and how we have shaped a critical process around it.

Timestamps:
00:00 Introduction
00:51 Primary treatment
03:32 Secondary treatment and BOD
09:11 Sludge digestion

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