Desalination and Water Reuse - Home
Search for
The International Desalination & Water Reuse Quarterly industry website
About us   Feedback   Register   Contact   Advertise   Links   Cookies  

Site Sponsor

What is RSS?
List of feeds
Desalination news on your website?

Yale team claims forward-osmosis success

A forward-osmosis technology described as "engineered osmosis" has been developed in the USA by a Yale University spinoff company called Oasys.

Professor Menachem Elimelech and graduate students Robert McGinnis and Jeffrey McCutcheon claim that their device reduces the energy needed to purify water to one-tenth of that required by conventional desalination systems.

Unlike conventional reverse-osmosis systems, forward osmosis establishes an osmotic pressure gradient instead of using pressure or heat to force water through a semipermeable membrane. A highly concentrated "draw" solution is used to induce a net flow of water through the membrane into the draw solution, thus effectively separating the feed water from its solutes.

The biggest challenge, according to Aaron Mandell, CEO of Oasys, was identifying a concentrated solution that could be removed efficiently and entirely. Details of Oasys's draw solution are a company secret, but it uses ammonia and carbon-dioxide gases dissolved in water in specific proportions.

The solution can be reused after being removed from clean water, and the membrane required is also nearly identical to those already used in reverse osmosis. While other companies are doing forward osmosis, Oasys claims that its draw solution makes its technology much more efficient.

Oasys estimates that engineered osmosis will cost US$ 0.37-0.44/m³ once fully scaled up. The startup has so far established a pilot-scale plant to test the technology by producing 1 m³/d.

Mandell says that Oasys is raising venture financing that will be put toward scaling to around 1,000-10,000 m³/d, still well below the scale of many commercial desalination plants.

Posted on 13 January 2009  

Get D&WR's news every week in our free newsletter. Register now - that's free too!

Print  Printer friendly   Print  Link to this page    Comment

Source: Desalination & Water Reuse

This story is tagged as:

Desalination | Forward Osmosis | Membrane | Research | USA
Click on a keyword to see more stories on that topic

Share this   digg   technorati cosmos   blinklist   reddit   newsvine   nowpublic   stumbleUpon   Add to diigo
Retweet this on Twitter Facebook  

Make a comment?
Sorry, you must be logged in to post a comment. Click here to login.

© Faversham House Group Ltd 2009. Desalination & Water Reuse news articles may be copied or forwarded for individual use only. No other reproduction or distribution is permitted without prior written consent.

Register Now!

You are not
logged in
Log in here
Register for free

Why not register for your free newsletter with all the week's news?

Related Stories

Boost for San Angelo water reuse plan
Toray acquires TCK
US farmers look to water reuse, as reservoir level drops
Researchers win funding for study of microbes in water reuse system
Oasys opens new office in Dubai
IDA seeks nominations for new water reuse and conservation awards
US commonwealth islands may turn to desalination
Desalitech teams with TEC to target municipalities
AMTA and AWWA announce ward winners
Texas Desal call for papers

About us   Feedback   Register   Contact   Advertise   Links   Cookies  

Faversham House  
Other Faversham House Websites include | Sustainabilitylive! | Utility Week

We use cookies to make this site as useful as possible. They are small text files we put in your browser to track and assist usage of our site but, with the exception of cookies that help you log in, they don't tell us who you are.
You can control cookies in your browser settings. If you use our site it implies that you consent to our cookie usage. To find out more about how we use cookies and how you can control them, click here to see our cookie policy.