Used cooking oil- the renders call it "yellow grease" that's the commodity it becomes after they clean it. It can be processed with out a centrifuge by settling or washing. The stuff we'd pick up from restaurants was usually 15-20% water, more if it rained recently because a lot of folks don't shut the lids on their grease barrels. We used a vacuum truck to collect it, at the plant we would put steam on the truck to get the grease good and warm then pump it into a cone bottom tank, processes vary from plant to plant we would heat with live steam until it got up to about 180* and was rolling pretty good then cut the steam off. After a few hours it would settle out and we would drain the water and "bottoms" off, on top would be good clean oil. Some plants add salt (increases the density of the water so it splits quicker) and soda ash light, TSP or sodium sulfate to help it break. some plants with more tank space didn't heat as much or use chemicals, after a few days it break and they could drain the water and bottoms off. Some places centrifuge the bottoms to recover the 5-10% oil it has, others rum it into other processes or sell the bottoms out.
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