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Electricity from Sewage and Waste Water

Wednesday, August 15, 2012 4:22

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Tiny Lab Test Sewage Fuel Cell

Electricity from Sewage

Up till now sewage and other waste water was treated by an activated sludge system or by anaerobic digestion methods. The anaerobic method produces methane, which in turn can be used to drive generators. The final dry waste product is almost sterile and can be used as organic fertiliser

Recently a science team at Oregon State University – led again, I am glad to say, by a woman Professor Hong Liu, have developed a microbial “fuel cell” that can produce electricity directly from sewage and other waste water.

I wrote some time ago about another lady scientist Ms Wang Qian who is working in Singapore on a revolutionary membrane for use in super-capacitors. I wonder how this is developing – must check it out!

http://wood-pellet-ireland.blogspot.ie/2011/10/batteries-super-capacitors-obsolete.html

This ability of microbes has been known for a long time but the new approach can achieve 10 to 50 more times the electricity than previously possible.

The research team believe their microbial fuel-cell method could eventually change the way that waste water is treated all over the world.

Professor Hong Liu is seen holding a jar of “fuel”, she believes the system will work on a commercial scale and will turn sewage treatment, currently a net energy user, into an energy producer.

The team reckon that their method works more efficiently than the alternative anaerobic digestion producing methane. It doesn’t have any of the environmental drawbacks of anaerobic digestion like hydrogen sulphide production or possible release of methane.

The “sewage” fuel-cell technology cleans the waste differently, bacteria oxidize the waste and in so doing produce electrons that activate the fuel cell creating electricity. Almost any type of organic waste material can be used to produce power.

Next big – big step is actually getting it to work in the real world, and a reasonable cost.

Good luck to you guys.

2012-08-15 04:19:20

Source: http://wood-pellet-ireland.blogspot.com/2012/08/electricity-from-sewage-and-waste-water.html

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