The term "waste oil from kitchen waste" here refers to discarded animal and vegetable oil and oily residues extracted during the collection, separation, and processing of greasy kitchen waste generated from catering, food processing, and household activities. After losing their original usability or being discarded, such waste oils can be recycable resource for purposes such as biodiesel feedstock, industrial fuel, or chemical raw materials through treatment processes including sedimentation, filtration, purification, and refining.