Biogas generators take in waste material or plants, and biogas and useful fertilisers come out the other end.
IN: Dung from people and animals, farm waste, garden rubbish
OUT: Methane for cooking, heating or refrigeration and slurry which can be used as a fertiliser
Biogas is a flammable mixture of gases (mainly methane) formed when bacteria break down plant material or the waste products of animals in anaerobic conditions
As well as burning well, biogas is carbon neutral and gets rid of much of the waste we produce. Also, since they are cheap, they can be used effectively in developing countries. They also work well in hot countries, because they don't need to be insulated to keep the bacteria working well.
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