Hi all, I'm planning to make a biogas digester to connect to my mobile home's   
   sewage out port. Hopefully this will make fertilizer, a bit of methane, and   
   possibly electricity, as I've read that anaerobic breakdown of organic matter   
   can run a microbial    
   fuel cell. My main question at this point is how the fertilizer is extracted?   
   On all the plans I've see, the tank is buried with an input and output pipe   
   going down into it. Somehow, the effluent seems to flow up and out the output   
   pipe, but I can't for    
   the life of me figure out how that works. It seems to defy gravity. Can anyone   
   enlighten me? Building this will save me from trips to the dump station and   
   use my poop for good rather than being a hazardous waste.   
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)