Can the sewage pipes in all rooms of the hotel be merged into one pipe and finally discharged?

You can't. According to the "Sewage Discharge Standard for Hotel Decoration", it can be known that the sewage pipes in hotel rooms cannot be used for multiple purposes, and the sewage must be treated before it can be discharged directly. The drain pipe, also known as siphon drain pipe, is installed at the bottom of the pool wall, with the center line of the pipeline 200 ~ 300 mm away from the bottom of the pool and an external drain valve.