Solar CITIES has innovated a way of teaching biogas principles using paint buckets. These are no mere toys however: loaded with manure and then fed ground up food waste the system should produce a few minutes of gas each day for demonstration in the classroom. Once the principle is grasped the system can easily be scaled up to a level where several hours of methane (plus 20 to 40 liters of great liquid fertilizer) can be produced each day -- using the same parts but different containers. This makes hands-on learning in miniature a gateway to real utility.
