Phosphorus recovery and nitrogen removal system and process for livestock and poultry breeding wastewater

The invention belongs to the technical field of wastewater treatment, and discloses a phosphorus recovery and nitrogen removal system and process for livestock and poultry breeding wastewater. The system sequentially comprises a dephosphorization tank, a short-cut denitrification tank and an integrated nitrosation/anaerobic ammonia oxidation tank. The system is used in the process, and the process comprises the following steps: enabling livestock and poultry wastewater to be treated to firstly flow into a phosphorus removal tank, then flow into a short-cut denitrification tank and then flow into an integrated nitrosation/anaerobic ammonia oxidation tank through a pump and a pipeline, enabling part of effluent of the integrated nitrosation/anaerobic ammonia oxidation tank to flow back into the short-cut denitrification tank, and enabling the effluent of the integrated nitrosation/anaerobic ammonia oxidation tank to flow back into the short-cut denitrification tank; part of sewage is directly discharged; mgCl2