Method and system for semi-closely processing medical sewage

The invention relates to a method and a system for semi-closely processing medical sewage. The method comprises the following steps: (1) wet type grinding; (2) sterilization by a chlorine method; (3) removal of residue disinfectant; (4) primary sedimentation; (5) aerobic bio-chemical processing of activated sludge; (6) secondary sedimentation, wherein the steps of (1) and (2) and the transfer of the sewage from the step (1) to the step (2) are carried out in a closed state. The system comprises wet type grinding equipment, a sterilization pond, a disinfectant removing pond, a primary sedimentation pond, an activated sludge pond and a secondary sedimentation pond, which are connected in sequence, wherein the wet type grinding equipment, the sterilization pond, and a sewage transfer device between the wet type grinding equipment and the sterilization pond all adopt the closed structure. The method and the system have the advantages of the realization of microorganism safety, unsusceptible occurrence of spreading risk of pathogenic microorganisms, relatively less investment, and convenient operation and maintenance.