Kitchen waste refers to domestic waste such as food waste, leftovers, expired food, melon skin and stone, flowers and green plants, and Chinese medicine residue. According to the classification of domestic waste, crab shells belong to kitchen waste. Crab shells and shrimp shells belong to kitchen waste, because they are relatively perishable, and the finished crab shells should be put into green kitchen waste containers. And big bones, coconut shells and durian shells that are too hard are other rubbish.

Kitchen waste contains extremely high moisture and organic matter, which is easy to rot and produce stench. After proper treatment and processing, it can be transformed into new resources. The characteristics of high organic matter content make it can be used as fertilizer and feed after strict treatment, and it can also produce biogas for fuel or power generation. The oil part can be used to prepare biofuels.

Specific categories of garbage classification

1, harmful waste

Harmful waste refers to the substances in domestic garbage that cause direct or potential harm to human health or the natural environment. They must be collected, transported and stored separately, and special safety treatment should be carried out by professional institutions recognized by environmental protection departments.

2. Other garbage

Other garbage refers to other domestic garbage except recyclables, harmful waste and kitchen garbage, that is, garbage mainly collected and treated by the current sanitation system. Other garbage refers to garbage with less harm and no reuse value, such as construction garbage and domestic garbage, which are generally treated by landfill, incineration and sanitary decomposition, and some of them can be solved by biological decomposition, such as earthworm release. Other garbage is recyclable, kitchen waste and a kind of garbage left over from harmful waste.

3. Recyclable materials

Recyclable materials are renewable resources, which refer to unpolluted wastes in domestic garbage that are suitable for recycling. It mainly includes waste electrical and electronic products, waste paper, waste plastics, waste glass and waste metal, which is the main work of domestic waste classification at this stage and an important factor affecting waste reduction.