TWI795608B

Provided is a sewage treatment system capable of maintaining a positive dissolved oxygen concentration of sewage flowing down through a sewer conduit downstream of a relay pump station, and changing a microbial state on an inner wall of the sewer conduit to prevent corrosion of the sewer conduit. The present invention relates to a sewage treatment system comprising: a relay pump station for sewage discharged from a sewage source including homes, offices and/or industrial plants/companies organizations. The sewage treatment system comprises: initial sedimentation pond, microbial material production device and final sedimentation pond, and more specifically to a sewage treatment system comprising dehydration means, a microbial material production device, water feeding means, a microbe activation device, and oxygen supply means. The sewage including the activated microbial material and the oxygen supplied from the oxygen supply means is sent from the relay pimp station to the sewage treatment facility.