this post was submitted on 28 Sep 2023
552 points (97.4% liked)

Technology

59713 readers
5858 users here now

This is a most excellent place for technology news and articles.

Our Rules

  1. Follow the lemmy.world rules.
  2. Only tech related content.
  3. Be excellent to each another!
  4. Mod approved content bots can post up to 10 articles per day.
  5. Threads asking for personal tech support may be deleted.
  6. Politics threads may be removed.
  7. No memes allowed as posts, OK to post as comments.
  8. Only approved bots from the list below, to ask if your bot can be added please contact us.
  9. Check for duplicates before posting, duplicates may be removed

Approved Bots

founded 1 year ago
MODERATORS
L3s
[email protected]
[email protected]
L4s
enu
552
Desalination system could produce freshwater that is cheaper than tap water (news.mit.edu)
submitted 1 year ago by [email protected] to c/technology
161 comments fedilink hide all child comments
 

Engineers at MIT and in China are aiming to turn seawater into drinking water with a completely passive device that is inspired by the ocean, and powered by the sun.

In a paper appearing today in the journal Joule, the team outlines the design for a new solar desalination system that takes in saltwater and heats it with natural sunlight.

The researchers estimate that if the system is scaled up to the size of a small suitcase, it could produce about 4 to 6 liters of drinking water per hour and last several years before requiring replacement parts. At this scale and performance, the system could produce drinking water at a rate and price that is cheaper than tap water.

https://www.cell.com/joule/fulltext/S2542-4351(23)00360-4

you are viewing a single comment's thread
view the rest of the comments
[–] assassin_aragorn 1 points 1 year ago (1 children)

Yes and no. I get what you're saying. No wash is 100% efficient, nor does it have to be. It's just going to set the number of runs the unit can do before it needs to go offline for more intensive cleaning. Short run times though lead to more expensive operation. What this work does is increase the run time by more efficiently removing salt.

Do you get what I mean? Long term salt buildup is going to cause problems, and the more slowly you can make that happen, the better.

[–] orrk 1 points 1 year ago (1 children)

salt is not limestone

[–] assassin_aragorn 1 points 1 year ago (1 children)

What does that have to do with anything?

[–] orrk 2 points 1 year ago

limestone deposited by water leads to a hard, not easy to remove build up as it will not readily redissolve into any water, unlike salt, that will gladly let its self be dissolved via osmotic pressure until the maximum salinity of water is reached

seawater for example has around 34-35 ppt salt, water is satisfied at around 260ppt, meaning that one saltwater flush of the system will clean out basically all the salt of like 7 prior runs