How to purify used cooking oil by chemicals means to make it reusable?

i want to specify that this is my high school chemistry project.Please help me find the specific answers related to chemistry.How to purify used cooking oil by chemicals means to make it reusable?
I am a chemist...And I agree. You can filter the particles out yes, but thats not the issue. The bad taste in the oil isn't really due to the particles, its due to the oil decomposing. Since the decomposition products are complex, any attempt to chemically return them to their former state would be exhausting. You're going to end up with a variety of chemicals and each one would need to first be seperated from the solution and then have an individual chemical reaction set up to restore it. It's not ecomnomical.How to purify used cooking oil by chemicals means to make it reusable?
You don't need chemicals. As long as the oil has not been over heated, merely filtering it will improve it by removing any waste products. Once over heated the molecular structure starts to break down and deterioration is rapid.
Well, I don't know if chemical means would work. You need to get rid of the smaller molecules. A centrifuge may drive the larger molecules to the bottom, but you may have to do a centrifuge, with a lower velocity, to clean out the foreign debris. Also, as you lower the temperature, the larger molecules tend to harden first. This alone may improve the oil, but I don't know to what degree. It would take some experimentation, and I am not entirely optimistic. In any case it means throwing away the smaller molecules, not converting them chemically. You would also have to have the oil tested for carcinogens. It wouldn't be good to have a slightly purified oil, that contained, unknown to you, harmful substances. That is, if used oil contains carcinogens. Will reused oil contain more?
I'm not a chemist so please correct me if I'm wrong but this would require enormous amounts of energy. It would be like trying to ';un';burn a piece of paper.