Biogas Volumes 1-3: Classroom Edition (Better Farming)

This is the current Bible of methane digesters. Lots of small scale solutions for individual or village uses. Many scalable systems.

A good first step to begin playing with biogas. You can definitely tell it is made for small remote villages in some sections with no access to proper tools or a hardware store. As an example it tells how to shut off the gas line if you don't have a real valve by either pinching the rubber line with vice grips or folding the line over twice and tying it with string. Overall a good introduction to beginning biogas production.