A rotating sludge scraper is the established and most effective technology for circular clarifiers and sedimentation basins. This system operates by slowly rotating a structural bridge or arm around a central pivot point, with attached scraper blades gently moving settled sludge along the tank floor towards a central collection hopper. The drive unit, typically a robust, sealed gearbox located at the center pier, is engineered for ultra-low-speed, high-torque output to ensure smooth and continuous movement under variable sludge loads. The scraper blades, often called squeegees, are strategically angled and can be adjusted to maintain perfect contact with the tank floor, compensating for any settlement or unevenness. These blades are predominantly fabricated from non-metallic materials like fiberglass-reinforced plastic (FRP) or ultra-high-molecular-weight polyethylene (UHMW-PE) to prevent corrosion and avoid damaging the tank's protective lining. A key application is in potable water treatment plants, where circular settling tanks are common. Here, the rotating scraper must operate reliably 24/7 to ensure clarified water quality by continuously removing settled floc without causing turbulence that could resuspend solids. Modern systems include overload protection and integration with central SCADA systems for remote monitoring and control. The design is renowned for its simplicity, reliability, and effective performance in tanks of all diameters. For specifications, capacity ratings, and pricing for a rotating sludge scraper tailored to your circular clarifier's diameter and sidewall depth, we encourage you to contact our sales team for a comprehensive proposal.
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