Thanks for the feedback. Yes, it's similar to a septic tank, but it will   
   produce methane and fertilizer (and electricity, though I'm curious about your   
   reasons for a microbial fuel cell not working), without the ground water   
   contamination problem. It    
   will also produce heat, and larger versions can output 140 degree water.    
      
   As for the fuel cell, it seems prototypes are cheap and easy to build. Might   
   produce a volt or so at a few hundred mA. These are small tabletop models, so   
   a septic tank size will likely produce a lot more.   
      
   Anyway, my question still stands: how does the compost climb up and out the   
   output pipe?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)