Everyone throws out a lot of garbage every day. In areas with better garbage management, most of the garbage is treated in a hygienic way, such as landfill, incineration, composting, etc. However, in many other places, garbage is often simply piled up or buried, leading to the spread of foul odors and pollution of soil and underground water bodies.

The cost of waste harmless treatment is very high, with the cost of treating one ton of waste ranging from 100 to several hundred yuan depending on the treatment method. People consume resources in large quantities, produce in large scale, and consume in large quantities, while also producing large amounts of waste. The consequences are unimaginable.

Looking at the methods of household waste classification from various cities around the world, they are generally based on the composition and quantity of waste, combined with local resources and treatment methods. For example, Germany generally classifies into paper, glass, metal, and plastic; Australia generally classifies into compostable waste, recyclable waste, and non-recyclable waste; Japan generally classifies into plastic bottle categories, recyclable plastics, other plastics, resource waste, large waste, combustible waste, non-combustible waste, and hazardous waste, etc.