Sealing device for primary sedimentation tank of sewage plant

The utility model relates to the technical field of primary sedimentation tank facilities of sewage plants, in particular to a primary sedimentation tank sealing device of a sewage plant, which comprises a circular primary sedimentation tank, a mud scraper is arranged at the center of the primary sedimentation tank, a support seat is arranged between the mud scraper and the primary sedimentation tank, rollers are arranged at two ends of the top of the mud scraper, and the mud scraper is arranged on the support seat. A mud scraper is arranged at the bottom end of the primary sedimentation tank, a plurality of buoys are arranged on the mud scraper, a frame is arranged at the top ends of the buoys, a water seal tank is arranged on the inner wall of the primary sedimentation tank, clear water is arranged on the water seal tank, and a sealing curtain is arranged between the outer side of the water seal tank and the frame closest to the water seal tank. According to the structure, when the mud scraper rotates, the