Is there a night shift at the sewage treatment station of 3A hospital?

Yes, generally speaking, someone should be on duty at night. If you have to work overtime all night in case of emergency, you are usually on duty. No matter what level of sewage treatment station, there must be someone on duty at night. If it is a municipal sewage treatment plant or a water supply company, it will not be on duty. This is a 24-hour unit.