Copenhagen’s sewage system was built in the 1850s and it was indeed considered to build a two-pronged solution. There was much resistance against this because it would eliminate a whole industry of “night men” (poop collectors), as well as people drying and trading it as fertilizer. So they build a single-pronged solution that was initially only allowed to be used for rain water.https://ing.dk/artikel/ingenioerer-maatte-kaempe-haardt-faa-...
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