Public urinal generates electricity from urine

http://www.eurekalert.org/pub_releases/2016-07/f-sf-pug070616.php

Public Release: 6-Jul-2016
Public urinal generates electricity from urine
FECYT - Spanish Foundation for Science and Technology

Pee can be transformed into electricity with the help of bacterial metabolism, thanks to a device created by researchers at the University of the West of England, where Spanish researchers are working. A test cubicle was installed at Glastonbury festival, but the final aim is to improve sanitation facilities in Developing World countries or in areas where there is limited electricity generation, such as refugee camps.

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The cells are installed inside a container which collects the urine, currently only from male users due to the design of the urinals. Inside, bacteria colonise the anode electrode and act as a catalyst, decomposing the organic material in the pee.

This decomposition releases both protons, which travel from the anode to the cathode across a semipermeable membrane, and electrons, which travel through an external electrical circuit. To complete the cycle, an oxygen reduction reaction also takes place in the cathode. The process generates enough energy to power light bulbs or LED tubes.

"Our project is aimed at developing countries, with a view to improving or incorporating sanitary facilities. In addition to producing electricity, the system reduces chemical oxygen demand (COD); in other words, it also serves to treat the urine," Merino emphasises.

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Now, in collaboration with Oxfam and other organisations, the researchers are planning to test these urinals in India or in some regions of Africa. Specifically, at refugee camps, in communities, at schools and in public toilets that lack lighting.

"The ultimate purpose is to get electricity to light the toilets, and possibly also the outside area, in impoverished regions, which may help improve the safety of women and children, in countries where they have to use communal toilet facilities outside their homes", concludes Ioannis Ieropoulos, the Director of the Bristol BioEnergy Centre (BRL, UWE), who leads the research.