💧 'Large connected sewage systems in Chicago, Paris, and Hanover, Germany, were some of the first built, and therefore are some of the modern world’s oldest and most in need of repair.' | Nance Klehm ReaderArchives
The water from the settling tank then enters secondary treatment, in which air is pumped into the tank to stimulate aerobic bacteria to consume the remaining organic matter suspended in the mixture. Over several hours, as the bacteria eat, more sediment falls out and settles into the tank. The water is then disinfected, usually by adding chlorine, then discharged as “effluent” into a natural waterway.
Annually, the city of Chicago sends out an extended water report to every mailbox in the city. Over the years I have noticed that contamination rates in the water supply have increased, though we are assured that they are still within safe levels by EPA standards—as these standards continue to be incrementally increased so we can clear the limbo bar as our systems age.
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