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BACTERIA MAY PRODUCE ELECTRICITY FROM WASTE

Perhaps in the not too distant future a light bulb in the toilet will be able to provide electricity to its own " sewer power plant ." American scientists have created and tested a battery that works thanks to bacteria living in sewage. Oxidizing organic compounds, for example, food residues that have got into the water when washing dishes, these microbes produce electricity.

An unusual source of cheap energy was found by scientists led by Bruce Logan of the University of Pennsylvania . They created and tested a prototype device, which is a tube 15 centimeters in length and 6.5 centimeters in diameter. This device allows you to capture electrons that are formed during the life of sewage bacteria.

The battery consists of eight graphite rods running along the tube, and a central electrode, which includes platinum. Bacteria linger on the surface of graphite, secreting electrons during the oxidation of organic substances in the water around them, and the platinum electrode closes this electrical circuit, providing current through the wires from the graphite rods.

According to Pennsylvanian scientists, the capacity of the " sewer battery " depends on the area of ​​graphite elements. While they managed to achieve 150 milliwatts per square meter, but this is not the limit. "We think you can achieve energy production up to 1000 milliwatts per square meter," Logan explained. In this case, a small enough device can, for example, feed a light bulb.

It is also important that the technology of energy recovery from waste will allow to unload sewerage stations, as during the work of the " bacterial battery " organic wastes are subjected to initial processing. The authors of the discovery hope that in the future the industrial version can be installed in every house.

A story about the invention of American scientists appeared in the journal Environmental Science and Technology .

print version
Date of publication 19.08.2004гг

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