A biogas digestion system is a way to convert biological waste (like
kitchen scraps, grass clippings, and manure) into usable biproducts of
methane and both liquid and solid fertilizers.
Biogas digestion works by creating an anerobic chamber (i.e. a place
without oxygen) which breaks down the organic matter you put in
it. There are two types of bacteria at play here. One type takes food
and converts it into acid. These are called acidogenic bacteria (aka
acetogens). Methanogenic bacteria (methanogens) convert the acid from
the first system into methane gas.
The methane gas produced is sufficient to run on the sorts of
appliances you'd run propane on. This opens up the doors to build
generators, stove tops, flame effects, refrigerators, and more. All of
this just running off of kitchen scraps.
Open questions for this project
- How much input material do you need in order to get a specific amount of biogas out?
- I've read that keeping the pH balance within the anerobic chamber is important. What range should you keep it to and how do you control that?
- How much would a system like this cost?
- How do we minimize the risks of unwanted fire or leaks?
- Where should such a device be stored?