Tea dregs, fruit peelings and fish bones belong to wet waste. Wet garbage is also known as food waste, i.e. biodegradable biomass household waste, which targets perishable garbage. Such as food waste, residues, expired food, melon peels and nuts, flowers and greenery, traditional Chinese medicine waste. Wet waste is generated from residents' daily lives, food processing, catering, personal dishes and other activities. Wet waste includes rusty leaves, debris, shells, eggshells, tea residues, bones, etc. Its main sources are household kitchens, restaurants, eateries, markets and other industries related to food processing. Fruit shells and nuts: fruit pulp (coconut pulp), fruit shells (watermelon shells, orange shells, apple shells), dried fruit (grape branches), etc. Waste food: cake, candy, air-dried food (dried meat, red dates, Chinese medicine), powder (brewed drinks, flour), animal feed, etc.