Cooking oil fume is usually purified by oil fume purification device and then discharged through special flue, which should reach the top of the building and the discharge port is upward;

Because the sewage from restaurants contains oil, if it is connected to the municipal drainage pipe network, it will be treated by oil separation tank before being discharged into the municipal drainage pipe network; if it is not connected to the municipal drainage pipe network, it will be treated by oil separation tank+tertiary septic tank+sedimentation tank and then stored in winter and irrigated in summer.

the sludge from the grease trap and the oil sludge from the fume purification device and the sludge from the septic tank are dried and sent to the landfill for treatment.

You asked a wide range of questions, and you didn't tell me the specific information. I can only give you an answer here. The specific items have to be analyzed in detail and combined with the local actual situation.