Scientists have engineered a new super biofilm, a key component of which is Bacillus stratospheric -- a microbe commonly found in high concentrations in Earth's stratosphere. Science Daily — Bacteria commonly found 30 kilometres above Earth have been identified as highly efficient electricity generators.
Bacillus stratospheric -- a microbe commonly found in high concentrations in the stratosphere -- is a key component of a new 'super' biofilm engineered by a team of scientists from Newcastle University.
Isolating 75 different species of bacteria from the Wear Estuary, Country Durham, UK, the team tested the power generation of each one using a microbial fuel cell (MFC).
By selecting the best species of bacteria, a kind of microbial "pick and mix," they created an artificial biofilm, doubling the electrical output of the MFC from 105 Watts per cubic metre to 200 Watts per cubic metre.
While still relatively low, this would be enough power to run an electric light and could provide a much-needed power source in parts of the world without electricity.
Among the 'superbugs was B. stratospheric, a microbe typically found in the atmosphere but brought down to Earth due to atmospheric cycling processes and isolated by the team from the bed of the River Wear.
Publishing their findings Feb. 21 in the American Chemical Society's Journal of Environmental Science and Technology,
Grant Burgess, Professor of Marine Biotechnology at Newcastle University, said the research demonstrated the "potential power of the technique."
"What we have done is deliberately manipulate the microbial mix to engineer a biofilm that is more efficient at generating electricity," he explains.
"This is the first time individual microbes have been studied and selected in this way. Finding B. stratosphericus was quite a surprise but what it demonstrates is the potential of this technique for the future. There are billions of microbes out there with the potential to generate power."
Microbes to generate electricity are not new and have been used in treating wastewater and sewage plants.
Microbial fuel cells, which work similarly to a battery, use bacteria to convert organic compounds directly into electricity through bio-catalytic oxidation.
A biofilm -- or 'slime' -- coats the carbon electrodes of the MFC and as the bacteria feed, they produce electrons which pass into the electrodes and generate electricity.
Until now, the biofilm has been allowed to grow unchecked but this new study shows for the first time that by manipulating the biofilm, you can significantly increase the electrical output of the fuel cell.
Funded by the Engineering and Physical Sciences Research Council (EPSRC), the Biotechnology and Biological Sciences Research Council (BBSRC) and the Natural Environment Research Council (NERC), the study identified several electricity-generating bacteria.
As well as B. stratospheric, other electricity-generating bugs in the mix were Bacillus altitudinis -- another bug from the upper atmosphere -- and a new member of the phylumBacteroidetes.
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