Stand alone
Single use, high usage rate, common in public places and families.
Categorical formula
There are mainly three kinds, recyclable, non recyclable and toxic substances. （1） Recyclable materials refer to wastes suitable for recycling and resource utilization.
It mainly includes:
Paper: writing paper, packaging paper and other paper products that are not seriously contaminated. Such as newspapers, all kinds of packaging paper, office paper, advertising paper, etc.
Plastic: waste container plastic, packaging plastic and other plastic products. Such as plastic bags, plastic bottles, foamed plastics, disposable plastic lunch boxes and tableware, hard plastics, etc.
Metal: various types of scrap metal articles. Such as pop cans, tin cans, lead toothpaste covers, etc.
Glass: Colored and colorless waste glass products.
Fabric: Used textile clothing and textile products.
（2） Non recyclable material refers to garbage other than recyclable garbage. The common garbage is easily decomposed under natural conditions, such as skin, vegetable leaves, leftover food, flowers, branches and leaves.
（3） Toxic substances, such as waste batteries, waste fluorescent tubes, mercury thermometers, waste paint, expired drugs, etc.
