Fresh, clean drinking water is in short supply in many places and the situation is getting worse. Yet 8 out 10 of us live within 20 miles of the sea.
The process of desalination is rather expensive, energy intensive and has other environmental impact issues, but there are other sources to power the process and ways of addressing these problems - such as better utilizing the wind as a power source.
Sir Charles Madden wrote to me recently about such a project he's heading via an Australian company called Windwater Pty Ltd.
Using the power of the wind and vapour compression desalination instead of reverse osmosis, Charles has demonstrated a very viable means of sourcing potable water from the ocean, both on a small and large scale without the expense, energy consumption and saline waste footprint of reverse osmosis.
Macro desalination: Wind turbines generating electicity (400 kW) - up to 280,000 litres/day, 160,000 litres/day on average, to drive vapour compression desalination units – fresh water from 0.12c per litre
Micro desalination transferring the power of the wind directly to the vapor compressor; Up to 14,000 litres/day, 8,000 litres/day average. Fresh water from 0.14c per litre. These units can be installed or moved by one suitably equipped person.
Micro desalination test unit
The benefits of vapor compression over reverse osmosis according to Charles are:
· less manpower
· no replaceable filters
· no pre-cleaning of feedwater required
· cleaner water
One of the challenges of large scale desalination is what to do with all that salt. Dumping it in shallow areas has been shown to negatively affect local marine ecosystem, so what Charles is proposing is small wind powered units called "Water Boatman" being moored in deep water with good currents would allow the salt to be safely dispersed in the sea.
Water Boatman - wind powered vapor compression desalination
A huge undertaking like the Water Boatman project requires substantial cash to get up and running properly, so Charles is looking for backers and joint venture partners. If you'd like to learn more about WindWater and the Water Boatman concept, you can contact Sir Charles via:
WindWater Pty Ltd
Sir Charles Madden Bt BSc MTech MBA
79 Birksgate Drive, Urrbrae SA Australia 5064
P 0433 565 039
E charlie.madden@internode.on.net
Related:
Simple water saving tips
Saving water in the garden
How wind turbines work
