According to different sources, kitchen waste is mainly divided into catering waste and kitchen waste. The former is produced by the leftovers in restaurants and canteens, which has the characteristics of large quantity, relatively concentrated quantity and wide distribution.

The latter mainly refers to the leftovers discarded by residents during their daily cooking, which come from thousands of households, and the quantity is huge but relatively scattered, and the overall output exceeds food waste.

Kitchen waste is commonly known as swill, swill, swill and swill, which is a general term for food waste and kitchen waste. It is mainly the domestic waste formed by residents in the process of living consumption, and it is the most important kind of food waste, including food processing leftovers (kitchen waste) and edible residues (swill) produced by families, schools, canteens and catering industries.

Its composition is complex, mainly composed of oil, water, peel, vegetables, rice flour, fish, meat, bones, discarded tableware, plastics, paper towels and other substances. It is characterized by easy decay and deterioration, stinking and spreading bacteria and viruses. The amount of kitchen waste in China is huge, and it is on the rise rapidly.

According to different sources, kitchen waste is mainly divided into catering waste and kitchen waste. The former is produced by leftovers in restaurants and canteens, and has the characteristics of large quantity, relatively concentrated quantity and wide distribution. The latter mainly refers to the leftovers discarded by residents in their daily cooking, which come from thousands of households, with a huge amount but relatively scattered, and the overall output exceeds that of food waste.

Extended data

According to the production process and specific materials, food waste can be divided into three parts:

1, garbage formed during food processing

Mainly stems and leaves cut from vegetables, soil entrained by vegetables, fish scales, head and foot feathers of poultry and so on. The rest is handled by the kitchen. This kind of garbage does not contain leftovers and garbage from oil-water separator, so it contains less oil and has low economic value. Generally, no one collects this garbage alone, and this garbage is mostly used for composting to produce organic fertilizer.

2, leftovers, commonly known as swill.

This kind of garbage is mainly leftover food and soup, and the oil extracted from it is called swill oil. This kind of oil is basically neutral in nature, and its acid value is not high, so it is easy to enter edible oil. This kind of pig that grew up eating swill is called garbage pig.

3, oil-water separator garbage

This kind of garbage is mainly a small amount of food, some grease and detergent left on the tableware in the washing process of restaurants and restaurants. With the washing water entering the oil-water separator, grease substances float on the water surface, forming oil-water separator garbage.

The oil content of garbage in oil-water separator is high, generally 20%-80%. With the different hotel grades, the oil content varies greatly. The oil extracted by oil-water separator is called "gutter oil", which has high freezing point and high acid value.