

Not my circus or my monkeys, but I can’t sleep so I did some cursory searching. I did undergrad research that was heavy into wastewater treatment, so this did sound a bit unlikely.
I found the biological secondary is pretty extensive and is being well utilized for energy generation, so the resultant level of treatment makes more sense. It looks like the claim is closer to “you could drink it if you wanted to, but don’t”.
https://www.wte.de/en/references/wastewater-treatment-vienna-austria/

















You can run Doom on just about anything.