1. Food residues: cereals and their processed foods (rice, rice, flour, bread and beans); Meat and eggs and their processed foods (chicken, duck, pork, beef, mutton, eggs, eggshells, animal offal, bacon, lunch meat); Aquatic products and their processed foods (fish, shrimp, crab, squid), etc.

2. leftovers: fish bones, broken bones, crab shells, shrimp shells, tea residue, coffee residue, leftovers and other food residues.

3. melon peel and stone: fruit pulp, fruit peel, fruit stem and branch, fruit stone, etc.