Bloom Box energy generator

This is a clip from 60 minutes about an alternative energy generator already being used:
http://news.cnet.com/8301-11128_3-10457410-54.html?part=rss&subj=news&tag=2547-1_3-0-20

 

Thread revival yes. Pretty freaking cool technology! If these are ever available to home buyers I will be in the front line purchasing my very own bloom box. Never worrying about electricity and what it will cost us at the end of the month.
I really hope this takes off.
Pretty cool video if you have the time.

http://www.youtube.com/watch?v=shkFDPI6kGE

 

So...oxygen on one side and fuel on the other. That part I understand. Where does the byproduct go? The combination of O2 and hydrocarbon chains has to go somewhere.