from what I have read, to neutralize the effect of the glycering, the oil needs to be heated on board to 180 degrees. The way that most acheive that is to use engine coolant circulated through the tank to heat the fuel. They start up and shut down on regular dino diesle or biodiesel, warming the fuel in the tank before switching over, then shutting down on the diesel to clear the lines.
On the acid, if what I recall seeing is correct, it comes from the foods that are cooked in the oil, not the oil itself.