Ed,
How about drawing gas from the sewer vent stack.......
Hmm well, it might be more efficient to ferment BS... as it is so much more plentiful..
Actually the gas producer I was talking about, burns the waste, the smoldering material produces flamable gases.... but not methane.
The most impressive gas burnoffs I've ever seen were in the middle east. They had BRIGHT flames that were 3 or four stories tall at times.
Great beacons in the desert. Imagine the waste of natural gas. I was told they don't process it because Oil is so much cheaper and easier to deal with. So they just Burn off the natural gas that is forcing the oil up to the surface.... what a waste!