Biobill,
I felt my ears burning and saw you invoked my name. Problem is, my area is pharmaceutical research/development, not organic chemistry which is what this is, so I try to stick with what I know, so far as offering opinions goes.
That said, I DO know that burning any oil with glycerol in it is like dumping sugar in a car's gas tank. You get an awful lot of incomplete combustion, resulting in carbon deposition on valves, combustion chamber, etc. If you can, it's best to remove the stuff. As far as electrolytic separation, I'd have to have someone explain the mechanism to me, because I've never heard of that before as a method of separating organic solutions.
Sorry I'm not more help.
Quinn