Basic Steps to Biodiesel. 1. Collect and filter used cooking oil, and allow unwanted water to settle and drain out. 2. Pump the oil into a processor and add a methoxide catalyst. Agitate the mixture and then allow it to rest. 3. The oil reacts with the methoxide to form biodiesel and a glycerin coproduct; allow the glycerin to settle and then drain it. 4. Wash the biodiesel to remove impurities and it will be ready to use.
Illustration by Keith Ward