There is no need to install two canteens with a size of 311 square meters, and the number of diners should be large. Then, this sewage pipe should be unified directly in the kitchen. The sewage discharged from the stove is directly connected to the sewage pipe, and the sewage pipe is connected to the buried grease trap outside. The sewage treated by the grease trap is directly discharged into the municipal pipeline. There is no need to install two outdoor grease traps. Just let the sewage suction truck come and clean up the waste residue and waste oil regularly.