Requirements for garbage sorting in Dongguan: According to the principle of "adapting to local conditions and being simple and easy to operate", there are enough garbage sorting and collecting containers in parking squares, public toilets, dining areas, gas stations, living areas, work areas and other areas to facilitate people to put garbage in a classified way. According to the requirements of garbage classification standards and operation guidelines in expressway service area, garbage can be divided into recyclable garbage, kitchen garbage, other garbage and harmful waste. The first kind of recyclables refers to the items that can be used as raw materials for production or can be reused after finishing, mainly including waste paper, plastics, metals, fabrics, electronic waste and so on. The second category of kitchen waste refers to perishable wastes such as leftovers, Chinese cabbage leaves, melon seeds, waste food, waste cooking oil and so on. The third kind of other garbage, except recyclables, restaurant garbage (kitchen waste) and other garbage outside harmful waste. It mainly includes waste food bags (boxes), waste plastic wrap, waste paper towels, waste bottles and cans, dust, cigarette butts, pet feces and so on. The fourth category of hazardous waste refers to the existence of heavy metals, harmful substances or wastes that are harmful or potentially harmful to the environment. Including batteries, fluorescent tubes, mercury thermometers, medicines, etc.