This model is a single peripheral drive center buttress suction dredger, which is mostly used in radial flow secondary sedimentation tanks. The level of the sedimentation tank has no slope, and there are a considerable number of suction pipes at the bottom of the tank. The siphon is formed by the liquid level and the water ejector to discharge the sludge. The upper part is equipped with a scum scraper, which is formed by the central water distribution and the middle part of the mud discharge.