Kitchen waste refers to organic wastes produced during the eating process, including food ingredients, leftovers, and expired food. It can be divided into raw kitchen waste such as leaves and fruit peels, as well as cooked kitchen waste such as leftovers. Flower arrangement materials and leaves, they can also be incorporated as organic waste for compost due to their similar nature to kitchen waste. Kitchen waste must be drained before recycling for 2 reasons. One is to prevent sewage from leaking, in turn minimize contamination and the volume of waste; secondly, compost cannot be produced if the water content is too high (as a large quantity of bulking agent will be needed).