Here is an interesting way to power a building:

Using a toilet can pay for your coffee or buy you bananas at a university in South Korea, where human waste is being used to help power a building.
Cho Jae-weon, an urban and environmental engineering professor at the Ulsan National Institute of Science and Technology (UNIST), has designed an eco-friendly toilet connected to a laboratory that uses excrement to produce biogas and manure.
The BeeVi toilet – a portmanteau of the words bee and vision – uses a vacuum pump to send faeces into an underground tank, reducing water use. There, microorganisms break down the waste to methane, which becomes a source of energy for the building, powering a gas stove, hot-water boiler and solid oxide fuel cell.
Channel News Asia via a reader tip
You can read more at the link.


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