Method and device for synchronously and efficiently removing nitrogen and phosphorus from low C/N domestic sewage by using internal carbon source through single-stage sequencing batch reactor

The invention discloses a method and a device for synchronously and efficiently removing nitrogen and phosphorus from low C/N domestic sewage by using an internal carbon source through a single-stage sequencing batch reactor, and belongs to the field of domestic sewage treatment. After domestic sewage enters the integrated short-cut nitrification endogenous short-cut denitrification phosphorus removal coupled anaerobic ammonia oxidation SBR reactor, an organic carbon source in the domestic sewage is converted into an internal carbon source in bacteria in a front anaerobic section, and the phosphorus release process is also completed; in the low-oxygen aeration stage, the phosphorus-accumulating bacteria absorb a part of phosphate in the sewage, and the ammonia-oxidizing bacteria oxidize ammonia nitrogen in a part of raw water into nitrite; and finally, in the anoxic section, part of nitrite and part of residual ammonia nitrogen generated in the aerobic section are converted into nitrogen by anaerobic ammonia oxidizing bacteria, the generated nitrate nitrogen is reduced into nitrite by denitrifying phosphorus-accumulating bacteria and denitrifying glycogen-accumulating bacteria, and the denitrifying phosphorus-accumulating bacteria further absorb phosphate. According to the method, the carbon source in the raw water is fully utilized to realize synchronous nitrogen and phosphorus removal of the low C/N domestic sewage, the ineffective loss of the carbon source is reduced, the energy consumption is reduced, and the sludge yield is relatively low.