An amazing article was published today
that represents a great breakthrough in the generation of hydrogen for fuel cell use while purifying waste water simultaneously. A tiny electric current (in lieu of oxygen) prevents fermentation. It's a short but fascinating read for those interested (or obsessed) with a solution to renewable energy with positive byproducts.
Is anyone thinking ahead of a home "septic tank" scaled down version? Seems this could be a self-sustaining process... Though not a "perpetual motion" device since it's not a closed system. But it would seem that a small portion of the energy generated could be used to cancel the fermentation while the excess hydrogen is used for fuel cell power.
I'll do more research, but this news has me very excited.