This type of material is the waste cooking oil, which does not
require high degree of purification either, but its large scale collection has not been solved (apart from some experimental systems yet. However, a relatively high amount of triglyceride and free fatty acid containing fatty materials are formed everywhere in the rendering facilities , which can be used as feedstock for bio gas oil production [19]. In these plants various fatty materials, meals, fodders are made from the waste of slaughterhouses and carcasses of livestock.