Food waste is mainly cooked products, which are commonly known as "swill" and "swill feet". The composition is mainly degradable organic matter, mainly including starch (polyhexose) contained in staple food, cellulose and pentosan contained in vegetables and plant stems, protein and fat contained in meat, monosaccharide, fruit acid and pectin (polysaccharide) contained in fruit, with NaCl as the highest inorganic salt and a small amount of trace elements such as calcium, magnesium, potassium and iron, which is of great value for resource recycling. Restaurant sewage treatment

"According to statistics, feed grain accounts for 41% of the total grain output in China every year. The land occupation rate and the number of food imports that can be reduced by the feed generated by the harmless utilization of huge catering waste every year are immeasurable. " Nie Yongfeng thinks, "We should seek advantages and avoid disadvantages. We can't just deal with it because there are risks. If it is transferred to domestic garbage in large quantities, it will make it more difficult to deal with domestic garbage. Human safety is the primary consideration, and both treatment and utilization should be combined, so that it can meet the requirements of circular economy and low-carbon life. "

Inspector Zack Zhang of the Urban Construction Department of the Ministry of Housing and Urban-Rural Development has been tracking the resource utilization of kitchen waste for many years. He pointed out: "The treatment of urban kitchen waste in China has been eliminated in the past and developed into resource utilization now, which has gradually been recognized by the society and valued by the government. Choosing a reasonable technical route is the key to the resource utilization of kitchen waste. All localities should choose the technical route according to their own conditions."

"Selling food waste compost directly is the most unsuccessful treatment method, with low resource utilization level, and the treatment unit is easy to lose money." According to Nie Yongfeng, the treatment of restaurant waste is technically feed and energy. Recoverable oils and wastes, that is, dry matter, are used as feed in protein, and recycled wastewater is used to produce biogas or compost. Different models create different values. At present, some cities in China have done better and formed their own unique models.