[citation][nom]XZaapryca[/nom]Ladies and gentlemen, may I present the 2nd Law of Thermodynamics. Seriously, how much energy was expended in the production of the enzymes, the processing of the cardboard, the transportation costs of the raw materials, etc. This is about as bad as using a potato to make electrical current. Hydrogen, compressed air, ethanol, etc. all use more energy than they themselves carry or produce. I wouldn't get too excited about this.[/citation]
Even so, if all of the inputs are waste products I can see this being kind of useful. Its probably better to just recycle the cardboard though. I guess if the leftover pulp has a use then it could find a niche in recycling plants.