Cleantech Blog: Low = Cost Desalination

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Tuesday, November 03, 2009

Low=20 Cost Desalination - Saltworks Breakthrough

Canadian firm, Saltworks = Technologies,=20 just came out of stealth in relation to their desalination technology, = which=20 they claim reduce the electrical energy required for desalination by = over 70%.=20 They report they can produce 1m3 of water with 1kW hour of electrical = energy,=20 compared to the 3.7kWhr per m3, which is what is currently achievable = using=20 reverse osmosis with the use of energy recovery devices.

So how to they do it? Well its novel. It appears to = be a new=20 approach. And novel and new are two things scarce as hens teeth in = relation to=20 desalination technologies.

They use solar heat (or waste heat) to = evaporate water=20 and concentrate salt water. They are converting solar energy into = osmotic energy=20 by doing this. They then use this osmotic energy to desalinate = water.
They=20 then expose the concentrated salt water to two separate solutions of = regular=20 salt water via two different =E2=80=98bridges=E2=80=99, one which is = porous to chloride ions,=20 the second which is porous to sodium ions.
The=20 sodium and chloride ions migrate across the respective bridges into the = salt=20 water solutions to equalise the difference in ion concentration between = the=20 solutions.
This creates two charged solutions, one enriched with = sodium ions=20 (positively charged), the second enriched with chloride ions (negatively = charged).
These two solutions are then exposed across two similar = bridges to=20 the water to be desalinated. This draws sodium ions into the chloride = enriched=20 solution and draws chloride ions into the sodium enriched solution: Net = result=20 desalination. Doing this they reckon they can produce 1m3 of water using = 1kWh of=20 electrical energy, which is used to pump fluids around the = pipework.
Because=20 the system is not under pressure, they can use plastic pipes instead of = steel=20 pipes, potentially reducing capital costs also.

I met with = Saltworks=20 about six months ago in Vancouver and I was impressed by the methodical = way they=20 have been going about technology commercialisation. Despite winning a = technology=20 innovation award in British Columbia in May 2009, they have kept this = remarkably=20 quiet. An article in the Economist=20 provides a good review of this.

Paul O'Callaghan is CEO of = Technology=20 Assessment Group, O2 Environmental Inc and author of = Water=20 Technology Markets.

1 Comment:

Vanguard = Funds=20 said...: Efforts were on throughout the world for low cost desalination and = by=20 achieving this Saltworks technologies have created history. This will=20 definitely help mankind in long term.; 11:20=20 AM

Post=20 a Comment

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Low=20 Cost Desalination - Saltworks Breakthrough

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