Domestic waste is mainly divided into four categories: 1. Wet garbage refers to perishable domestic garbage containing organic matter. Including kitchen waste generated by residents' daily life, kitchen waste generated by restaurants and fresh waste generated by farmers' markets. 2. Recyclable garbage refers to unpolluted domestic garbage suitable for recycling and resource utilization, such as glass, metal, plastic (rubber), paper, textiles and small household appliances. 3. harmful waste refers to the domestic garbage that contains harmful substances and needs special safety treatment; Mainly rechargeable batteries, button cell, lamps, waste drugs, pesticides (containers), paints (containers), selenium drums, mercury products, etc. 4. Other garbage refers to other domestic garbage except recyclables, hazardous wastes and perishable garbage.

Garbage classification has four colors: red, blue, gray and green; 1, red represents hazardous waste. Harmful substances include waste batteries, fluorescent tubes, paints, expired drugs, cosmetics and other substances that are not recyclable and have certain pollution hazards; 2. Green represents kitchen garbage. Kitchen waste can be used as fertilizer for plant nutrients, which can be decomposed and absorbed by natural microorganisms and plants after being buried in soil, thus playing the role of waste reuse; 3. Blue represents recyclable garbage, including valuable substances such as plastics, paper and metals, which will be incorporated into the waste recycling system for resource recovery; 4. Except harmful substances and recyclable substances, garbage, bricks, ceramics, muck and other wastes that are difficult to recycle are generally burned and buried.