1. Generally speaking, the blue trash can is recyclable. This kind of garbage can be recycled and processed into raw materials for production, or it can be sorted and reused. Common recyclable items include books, newspapers and magazines, office paper, plastic beverage bottles, plastic lunch boxes, foamed plastics, etc.

2. Green trash can is generally kitchen waste. Most of these wastes are perishable wastes produced by families, catering enterprises, collective canteens and farmers' markets. This kind of garbage is corrupt and can be used for high-temperature composting.

3. Most of the red trash cans are harmful waste, and some places are also represented by gray. This kind of garbage includes abandoned fluorescent tubes, mercury sphygmomanometers and mercury thermometers; Drugs, pesticides and cosmetics; Waste hair dye shell, disinfectant shell, etc.

4. The gray trash can is other garbage, that is, dry garbage. This kind of garbage refers to garbage other than the above three kinds of garbage, which has certain pollution, but it is not good for corruption.