The peripheral drive mud scraper is mainly composed of driving mechanism, main beam, central rotating support, guide cylinder, mud scraping system, slag hopper and flushing mechanism, articulated slag scraper, skimming plate, skimming bucket, water outlet triangle edge plate, scum baffle, control box and other components.

The suspended sludge is deposited at the bottom of the tank after sedimentation. The supernatant is discharged out of the tank through the overflow weir and the sludge scraper is scraped from the periphery of the tank to the central sludge collecting tank. The sludge is discharged out of the tank through the sludge discharge pipe depending on the water pressure in the tank. Driven by the peripheral driving device, the main beam takes the central rotating support as the axis and runs along the tank top at a linear speed of 2.0 M / min. the lower part of the main beam is connected with the support and sludge scraper. The scum scraper is set near the liquid level and extends to the hinged scraper along the central steady flow cylinder. When the main beam rotates, the scum scraper skims the scum from the center of the pool to the periphery of the pool and collects it in the hinged scraper area. The collected scum moves around the pool with the main engine to the skimming bucket, and then scrapes to the skimming bucket through the hinge of the scraper and discharges to the outside of the pool.