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Solar-powered toilet for South Asia, Africa

Reuters, Seattle
Bill Gates is betting the toilet of the future for the developing world will be solar powered.
The world's leading private philanthropist handed a $1,00,000 prize to the California Institute of Technology on Tuesday for its work on a sell-contained, sun-powered system that recycles water and breaks down human waste into storable energy.
Gates is focusing on the need for a new type of toilet as an important part of his foundation's push to improve health in the developing world.
Open defecation leads to sanitation problems that cause 1.5 million children under 5 to die each year, Gates said, and Western-style toilets are not the answer as they demand a complex sewer infrastructure and use too much water.
"Imagine what's possible if we continue to collab-orate, stimulate new investment in this sector, and apply our ingenuity in the years ahead," The Microsoft Corp co-founder said at his foundation's Seattle headquarters on Tuesday.
"Many of these innovations will not only revolutionise sanitation in the developing world, but also help transform our dependence on traditional flush toilets in wealthy nations," he said.
His foundation announced $3.4 million in new funding on Tuesday for toilet projects being worked on by various organisations, bringing total investment in its "Reinvent the Toilet Challenge" to about $6.5 million.
About 2.6 billion people, or 40 percent of world's population -- mostly in sub-Saharan Africa and south Asia -- lack access to safe sanitation and are forced to defecate in the open, according to Gates.CREATES ENERGY
Gates presented prizes on Tuesday to the teams that showed the most progress, handing Caltech the first prize of $1,00,000 for its working model of a so 1 ar- powe red bath room, where a solar panel produces power for an electrochemical reactor.
The reactor breaks down faeces and urine into hydrogen gas, which can be stored in hydrogen fuel cells to provide a back-up energy source for night operation or use in low-sunlight conditions.
The workings of the toilet are designed to be buried underground beneath a conventional-looking stall and urinal setup, which the Caltech team showed in cross-section at the Gates Foundation courtyard.
Water recovered from the continuous process is pumped up again to provide water to flush the toilet.