microbialfuelcell
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Rowing robot powers itself by gulping dirty water
One day, you might see robots that not only survive in hazardous environments, but thrive in them. University of Bristol researchers have built Row-bot, a swimming robot that powers itself by feeding on dirty water. Its paddle both propels it forward and helps its microbial fuel cell gulp down the nutrients it needs to generate electricity. This robot might never need refueling so long as it's wading through unpleasant seas, whether they're full of algae or oil.
Researchers create super-efficient microbial fuel cell, dream of selling excess electricity
Recycling wastewater to generate energy has turned up noses before, but researchers at Oregon State University have developed a microbial fuel cell that can create 10 to 50, or even 100 times more electricity per volume than similar technologies. After refining the tech for several years using new materials, techniques and selecting better microbes, the team can now extract two kilowatts per cubic meter of refuse. As bacteria oxidizes organic matter, electrons -- rather than the hydrogen or methane that other methods rely upon -- are produced and run from an anode to a cathode within the device to create an electric current. Once implementation costs are cut down, the technology could power waste treatment plants and enable them to sell excess electricity. The contraption isn't just for processing what comes out of the porcelain throne -- it can also utilize materials ranging from grass straw to beer brewing byproducts. For now, however, the cell will tackle a pilot study before it inches closer to your local brewery or water treatment facility.
Microbial fuel cell produces hydrogen from wastewater without wasting energy
Back in 2005, Bruce Logan and his team of Penn State researchers developed a microbial fuel cell capable of converting poop into power. Now, Logan has refined his system to the point where it can produce hydrogen from wastewater or biodegradable organic materials without using a drop of grid electricity, and without emitting even a hint of carbon dioxide. His approach, outlined in the September 19th issue of the Proceedings of the National Academy of Sciences, involves something known as reverse-electrodialysis (RED) -- a process that harvests energy from the ionic discrepancy between fresh and salt water. Logan's bacterial hydrolysis cell (pictured left) features a so-called RED stack that's comprised of alternating positive and negative ion exchange membranes, which it uses to split water molecules into hydrogen and oxygen. Normally, this process would involve about 25 pairs of membranes, but by using RED technology in conjunction with electricity-producing exoelectrogenic bacteria, Penn State's team was able to extract hydrogen with just five membrane pairs. All told, Logan's cells proved to be about 58 to 64 percent energy efficient, while producing between 0.8 to 1.6 cubic meters of hydrogen for every cubic meter of liquid that passed through the system. The researchers' results show that only one percent of that energy was used to pump water through the cells, which are completely carbon neutral, as well. According to Logan, this breakthrough demonstrates that "pure hydrogen gas can efficiently be produced from virtually limitless supplies of seawater and river water and biodegradable organic matter." Somewhere, the US Navy is taking scrupulous notes. Full PR after the break. [Image courtesy of Penn State / Bruce Logan]
Urinal power plants to juice up Lollapalooza-dwelling robots
Do you have to relieve yourself? Is your robot low on batteries? Your previously problematic world could soon be harmonized in one magical step. The Bristol Robotics Lab has been feeding funny trash to its Microbial Fuel Cells for quite some time -- rotten fruit, decomposed-in-sludge fly juice, grass clippings -- things like that. The Lab has now found that the nitrogen-urea-chloride-potassium-bilirubin cocktail present in urine is a particularly useful waste fuel which will play nicely with stacked fuel cells, as long as the fuel is, um... flowing. They've already partnered with waterless urinal manufacturer Ecoprod to create a portable urinal power plant that "could be used [...] at music festivals and other outdoor events," and hey, if HP can power their data centers with excrement, who can take offense to this? [Image of Dr. Ioannis Ieropolous holding a microbial fuel cell courtesy of University of the West of England]
