Making Salt Water Drinkable Just Got 99 Percent Easier • Hacker News Board

Re: Making Salt Water Drinkable Just Got 99 Percent Easier

#11

Post by tim333 » Sun, Apr 10, 2016, 3:59 PM UTC

Dylan16807 wrote: post #3

When I search to find the minimum energy cost of separating the salt and water based on entropy, I find this article: http://arstechnica.com/science/2011/08/desalinization-is-thi... > A state-of-the-art facility is now within a factor of two of the theoretical energy minimum > The total process of desalination turns out to require three to four times the theoretical minimal energy use, since the salt water must be pu…

Lockheed's data sheet pdf says

"Up to two orders of magnitude more permeable than today’s industry standard material"

and "10-20% reduction in energy consumption due to pressure reduction"

so maybe the journalist got his energy and permeability muddled?

http://www.lockheedmartin.com/content/dam/lockheed/data/ms2/...

Re: Making Salt Water Drinkable Just Got 99 Percent Easier

#12

Post by SaaS_throwme » Sun, Apr 10, 2016, 4:00 PM UTC

Graphene has been creating quite a few news (other was raindrop electricity).

What's the cost of graphene, is it cheap enough?

Re: Making Salt Water Drinkable Just Got 99 Percent Easier

#13

Post by mrfusion » Sun, Apr 10, 2016, 4:00 PM UTC

If this was true it would change everything: agriculture in the worlds deserts would cut food prices in half or more, greening he deserts would suck up a ton of co2, no more water shortages.

Re: Making Salt Water Drinkable Just Got 99 Percent Easier

#14

Post by desireco42 » Sun, Apr 10, 2016, 4:04 PM UTC

So this article obviously is not representing truth. Essentially author picked old news, as someone said, Graphene has a new publicist. Also didn't really understand how thing work to be able to claim 100 times better efficiency.

My question is this, why do these things happen?

Is it because Gizmodo is hiring people who would work for rock bottom salaries?

Is it because journalists are pushed to crank out articles?

Is it something else?

Re: Making Salt Water Drinkable Just Got 99 Percent Easier

#15

Post by convexfunction » Sun, Apr 10, 2016, 4:06 PM UTC

The author doing the usual journalism thing of not understanding what's going on and then breathlessly reporting something similar and very wrong that'll get certain people excited is one thing, I know to expect that. Watching this get upvoted onto the front page is... well, maybe my expectations are too high.

Re: Making Salt Water Drinkable Just Got 99 Percent Easier

#16

Post by tim333 » Sun, Apr 10, 2016, 4:13 PM UTC

convexfunction wrote: post #15

The author doing the usual journalism thing of not understanding what's going on and then breathlessly reporting something similar and very wrong that'll get certain people excited is one thing, I know to expect that. Watching this get upvoted onto the front page is... well, maybe my expectations are too high.

>Watching this get upvoted onto the front page is...

It takes a little while to read up and see the flaws. Guess people vote first. I was just reading the osmotic pressure for seawater is about 1000 psi so the resistance of the membrane is probably going to be pretty small in comparison.

Re: Making Salt Water Drinkable Just Got 99 Percent Easier

#17

Post by ZenoArrow » Sun, Apr 10, 2016, 4:27 PM UTC

This is a well known application of graphene, the challenge is in working out the manufacturing processes to get the cost down whilst still retaining the material uniformity. It will be revolutionary when its available. Does anyone have any news of recent progress in graphene manufacturing?

Re: Making Salt Water Drinkable Just Got 99 Percent Easier

#18

Post by acheron » Sun, Apr 10, 2016, 4:30 PM UTC

desireco42 wrote: post #14

So this article obviously is not representing truth. Essentially author picked old news, as someone said, Graphene has a new publicist. Also didn't really understand how thing work to be able to claim 100 times better efficiency. My question is this, why do these things happen? Is it because Gizmodo is hiring people who would work for rock bottom salaries? Is it because journalists are pushed to crank out articles? I…

> why do these things happen?

> Gizmodo

Friends don't let friends read Gawker.

Re: Making Salt Water Drinkable Just Got 99 Percent Easier

#19

Post by c22 » Sun, Apr 10, 2016, 4:59 PM UTC

SaaS_throwme wrote: post #12

Graphene has been creating quite a few news (other was raindrop electricity). What's the cost of graphene, is it cheap enough?

Well you can always peel it off the tips of your pencils.

Re: Making Salt Water Drinkable Just Got 99 Percent Easier

#20

Post by dghughes » Sun, Apr 10, 2016, 5:15 PM UTC

Anything amazing these days you just know graphene is involved without even looking at the article.

Just the past 11 days alone I've seen articles on graphene coated solar panels make power, graphene filters for terahertz communications, nanotube film, nano-silicon graphene Li-Ion battery electrodes, even graphene tennis rackets and now this graphene water filter.