Blue trash can refers to recyclable garbage, including plastic, glass, paper, metal and other valuable substances, which will be included in the waste recycling system for resource recovery and treatment.
The green trash can represents kitchen garbage. Generally speaking, the leftovers can be reused as nutrients.
The red sorting trash can is filled with harmful waste, which refers to the garbage that contains harmful substances and needs special safety treatment, such as used batteries, lamps, articles with chemical residues, etc.
Yellow trash can refers to the special trash can for medical waste, which is generally used in hospitals, health stations and other medical places.
Black trash can represents garbage except harmful waste and recyclable garbage, which can usually be burned and buried, such as cloth, bricks, dregs, etc.