Actually, I'm wondering what to do with the glycerine and free fatty acid by products. I understand that the FFAs can be used as a strong degreaser, so maybe the donor restaurant would be interested in it. The glycerine can be distilled to get a substantial portion of the methanol back, which further purifies the glycerine (of methanol). I have no idea what to do with raw glycerine. Make a ton of soap? I don't bathe that frequently!
The glycerine and FFA byproducts should rougly equal the volume of methanol added to the WVO for cracking, or about 20-25% of the initial volume. If you're cracking 25 gallons a week, you're looking at about 6 GALLONS a week of stuff you have to get rid, and somehow I don't think either a landlord or the sanitation department would cotton to having 6 gallons of soapy chemical byproducts dumped into the sewers every week. The glycerine, could probably be held until there was enough to sell it to a commercial renderer, but where you gonna store a couple of hundred gallons of glycerine?
I can see it now....
Neighbor: "Whatcha got in tha barrels?"
Me: "Glycerine that I get from cracking WVO."
Neighbor (to cops): "This crazy dude who lives in a bus is making crack and nytroglycerine...."
Ay, Chihuahua! I do not like the idea of having tear gas fired into my bus while I am asleep at night!