Decolorizing sand applicable scope: It is suitable for decolorization and deodorization of black smelly diesel oil produced by catalysis and cracking in small and medium-sized refineries, decolorization and deodorization of black smelly diesel oil in the middle and late stages of refineries, decolorization and deodorization of black smelly diesel oil produced by single kettle distillation (local oil refining), decolorization and deodorization of black smelly diesel oil produced by storage tanks in refineries and oil companies, and more suitable for decolorization and deodorization of black smelly diesel oil produced by waste oil refining. It also has obvious effect on decolorization, deodorization and filtration of biodiesel and can effectively improve the quality of biodiesel.