According to the article this is a closed loop cooling system, once it’s up and running it doesn’t use any water. They run water through it during installation and that’s the discharge that they found bacteria in.
You can have a “closed loop system” but you need to shed heat somewhere and that is either by air cooling drawing tons of electricity, or evaporation that draws tons of water.
You can have a “closed loop system” but you need to shed heat somewhere and that is either by air cooling drawing tons of electricity, or evaporation that draws tons of water.