is it done mechanically or by people?
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From my wife, a chemist at a waste water treatment plant that took ELI5 way too seriously:
First thing that happens the waste water goes through screens which takes out material people shouldn’t flush and sends the water into tanks. There are bugs that grow in tanks of wastewater that eat the yucky poopy pollution. After bugs are full the water goes in different tanks and the bugs are separated from the water, some bugs go back into first tank and rest are thrown away. Then just enough strong bleach is added to kill extra germs before the water is put back into environment.
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