1. No treatment, directly use waste oil as heating fuel for heating boilers;

   2. Used as release agent for building template or water-proof pigmentum, etc;

   3. Simple filtration, then use again;

   4. Traditional regeneration, treated by distillation and chemicals, then get clean fuel or base oil for recycle use;

   All the above treatment methods could make secondary use for the waste oil. But think it deeply, you could find that all these methods would still cause pollution to the air or soil or water. Thus, a new type of treatment and clean regeneration method for treating the waste oil was developed, that is catalytic distillation.