The oil decoloring system comprises a decoloring tank, an emptying pipeline, an oil separation tank and a recovery pipeline, wherein the oil separation tank comprises a tank body and a plurality of baffles vertically arranged in the tank body; The decoloring tank is communicated with the oil separation tank through an emptying pipeline; The grease trap is used for extracting water vapor with splashed grease from the decoloring pool through an emptying pipeline, and capturing the splashed grease from the water vapor with splashed grease; The grease trap is also used to transport spilled oil back to the decoloring pool through the recovery pipeline.

Grease is a mixture of oil and fat, also known as triglyceride. Oil is hydrolyzed into glycerol and fatty acids. The melting point of oil depends on the type of fatty acid. Oils formed by saturated fatty acids with more carbon atoms are mostly solid at room temperature and are called fats.