Energy futuresNew source of power: bugs from space

Published 23 February 2012

Researchers find that bacteria normally found thirty kilometers above the earth are highly efficient generators of electricity

B. stratoshericus, a most efficient electricity-generating bacterium // Source: india.com

Bacteria normally found thirty kilometers above the earth have been identified as highly efficient generators of electricity.

Bacillus stratosphericus, a microbe commonly found in high concentrations in the stratosphere orbiting the earth, is a key component of a new “super” biofilm that has been engineered by a team of scientists from Newcastle University.

A Newcastle University release reports that the team isolated seventy-five different species of bacteria from the Wear Estuary, Country Durham, United Kingdom, then 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 were able to create an artificial biofilm, doubling the electrical output of the MFC from 105 Watts per cubic meter to 200 Watts per cubic meter.

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 super bugs was B. Stratosphericus, a microbe normally found in the atmosphere but brought down to earth as a result of atmospheric cycling processes and isolated by the team from the bed of the River Wear.

Publishing their findings today in the American Chemical Society’s Journal of Environmental Science & 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.”

The use of microbes to generate electricity is not a new concept and has been used in the treatment of waste water and sewage plants.

Microbial Fuel Cells, which work in a similar way to a battery, use bacteria to convert organic compounds directly into electricity by a process known as 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 un-checked 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 a number of electricity-generating bacteria.

As well as B. Stratosphericus, other electricity-generating bugs in the mix were Bacillus altitudinis — another bug from the upper atmosphere – and a new member of the phylum Bacteroidetes.

— Read more in Jinwei Zhang et al., “Enhanced electricity production by use of reconstituted artificial consortia of estuarine bacteria grown as biofilms,” ACS Journal of Environmental Science & Technology (21 February 2012) (DOI: 10.1021/es2020007)

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