Defense contractor takes break from F-35 JSF, finds a way to eliminate 99% of the energy cost of desalination. Lockheed-Martin has developed a way to craft sheets of carbon a single atom thick, which can filter the salt (and just about anything else) from water with a tiny fraction of the energy required by current processes. "Lockheed officials see other applications for Perforene as well, from dialysis in healthcare to cleaning chemicals from the water used in hydraulic fracturing, or "fracking," of oil and gas wells." Previously.
Nanoscale electrodes separate salt from seawater. It uses special electrodes: ... "It first draws ions from seawater into a pair of electrodes. As the researchers pass current through the electrodes, electrochemical reactions drive chloride ions into a silver electrode and sodium ions to an electrode made from manganese oxide nanorods. Next, the researchers remove the desalinated water and release the trapped ions into a separate stream of waste seawater by reversing the direction of the electrical current." And at this point the salt in the water is only reduced by about 50%.
Researchers at MIT and in Korea have developed a new, efficient desalinization nanotechnology that could theoretically lead to small, portable units powered by solar cells or batteries, yet deliver enough potable fresh water from seawater to supply the needs of a family or small village. As an added bonus, the system would simultaneously remove many contaminants, viruses and bacteria. MIT Press Release. Abstract and Supplementary Information from Nature Nanotechnology. (pdf) [more inside]