Domestic garbage can generally be divided into four categories: recyclable garbage, kitchen garbage, harmful waste and other garbage. At present, the commonly used garbage disposal methods mainly include comprehensive utilization, sanitary landfill, incineration for power generation, composting and resource reuse.

(1) Recyclable garbage: It mainly includes five categories: waste paper, plastic, glass, metal and cloth.

1. Waste paper: it mainly includes newspapers, periodicals, books, all kinds of wrapping paper, office paper, advertising paper, cartons, etc. However, it should be noted that paper towels and toilet paper are too water-soluble to be recycled.

2. Plastics: mainly including various plastic bags, plastic packaging, disposable plastic lunch boxes and tableware, toothbrushes, cups, mineral water bottles, toothpaste tubes, etc.

3. Glass: mainly includes various glass bottles, broken glass pieces, mirrors, light bulbs, thermos bottles, etc.

4. Metal objects: mainly include cans and cans.

5. Cloth: mainly includes discarded clothes, tablecloths, towels, schoolbags, shoes, etc.

Through the comprehensive treatment and recovery of recyclable garbage, pollution is reduced and resources are saved. If every 1 ton of waste paper is recycled, 850 kilograms of paper can be made, 300 kilograms of wood can be saved, and pollution is reduced by 74% compared with the same output; Every 1 ton plastic beverage bottle can recover 0.7 tons of secondary raw materials; Every recovered 1 ton of scrap steel can produce 0.9 tons of steel, which saves 47% cost compared with ore smelting, reduces air pollution by 75%, and reduces water pollution and solid waste by 97%.