pull down to refresh

It's cheaper to purify sewage than to purify seawater, so desalination is really only relevant in places without plumbing infrastructure... and even there it's the wrong approach.
this territory is moderated
21 sats \ 1 reply \ @OT OP 20 Oct
Interesting... What makes sewerage cheaper to purify? Is it because its already liquid and contained?
reply
The composition of sewage is more predictable and a lot of the contaminants are organic, so bacteria can do a lot of the cleaning for us. If you go to a treatment plant, you can see that most of the process is just letting the water sit in big aerated tanks while the bacteria eat the poop.
The seawater has been sloshing around for millions of years and is full of minerals and things bacteria don't eat so you need to either distill it or pump it through a lot of filters.
reply