on a large-scale operation, as in mini-refinery size, maging profitable kaya ito? i'm thinking jollibee, mcdo, kfc, and other fastfood chains as main sources of the oil -- they have to put that oil somewhere!

and do they pay for its disposal? think of it - you get paid to take their oil, you spend some money to process it into usable fuel, then sell it to other people.

...anyone into waste management here?