Legal analysis: Catering establishments should collect sewage generated in the course of operation in a centralized way, and pretreat oily sewage by oil separation and slag separation. To discharge sewage into urban drainage facilities, it shall go through the relevant drainage permit formalities with the competent department of urban drainage. Dining places in the public * * * sewage pipe network coverage area, should meet the national and local standards of sewage discharged into the public * * * sewage pipe network; Dining places in the public * * * sewage pipe network does not cover the area, it should be self-built sewage treatment facilities or self-built drainage pipe network connected to the public * * * drainage facilities.

legal basis: article 81 of the law of the people's Republic of China on the prevention and control of air pollution, catering service operators who discharge oil fume shall install oil fume purification facilities and keep them in normal use, or take other oil fume purification measures to discharge oil fume up to the standard and prevent pollution to the normal living environment of nearby residents. It is forbidden to build, rebuild or expand catering service projects that produce oil smoke, odor and waste gas in residential buildings, commercial and residential complex buildings without special flues and commercial floors adjacent to residential floors in commercial and residential complex buildings. No unit or individual may barbecue food in the open air or provide a venue for barbecue food in the area prohibited by the local people's government.