Sewage treatment device and process for deep denitrification under low carbon-nitrogen ratio by ASO (Anaerobic Sludge Oxidation) method

The invention provides a sewage treatment device and process for advanced nitrogen removal under a low carbon-nitrogen ratio by an ASO (anaerobic sludge oxidation) method, and the device is sequentially provided with an anaerobic tank, a sulfur autotrophic denitrification tank and an aerobic tank as well as a granulation manufacturing unit constructed beside the ASO process according to the water flow direction of sewage; the granulation manufacturing unit comprises a domestication pool, a granulation pool, a cross-linking pool, a freezing pool and an automatic feeding device which are connected in sequence; and the automatic feeding device is used for automatically feeding the granules into the sulfur autotrophic denitrification tank. The device provided by the invention improves the nitrogen removal efficiency, does not need to add a new structure, and can be placed in front of a secondary sedimentation tank of a sewage treatment plant. The process comprises the following steps: sewage sequentially passes t