Combined process sewage treatment system

The utility model discloses a combined process sewage treatment system, the combined process sewage treatment system comprises an anaerobic ammonia oxidation bypass system and a mainstream treatment system, the effluent of the anaerobic ammonia oxidation bypass system flows into the mainstream treatment system, and nitrite nitrogen NO2--N, N-dimethyl formamide is provided for the mainstream treatment system. Sludge of the anaerobic ammonia oxidation bypass system is discharged into the mainstream treatment system at the beginning of an operation stage of the combined process sewage treatment system, and an anaerobic ammonia oxidation strain AAOB is provided for the mainstream treatment system, so that an anaerobic ammonia oxidation denitrification process is started in the mainstream treatment system; and forming a combined denitrification process with the original denitrification process of the mainstream treatment system. According to the technical scheme, in the sewage treatment process, the short-cut nitr