... Easy to Operate 3. Large drive torque and energy saving Bridge Sludge Scraper and Suction Equipment This kind of sludge scraper ... launder, accessory bridge, rake skimmer, scum scraper, scum baffles, sludge scraper, effluent weir, central bearing seat and influent well. ... 2. As the accessory bridge rotates, the scraper thereunder scrapes the ...