Dutco Tennant LLC can take care of all your wastewater and sewage treatment solutions. Our supplied circular scrapers are manufactured to a basic design and are mainly made of stainless steel. Our full-bridge and semi-bridge rotating sludge scrapers are of latticework type. There is a variety of configurations, with or without supplementary functions. The scrapers can be peripheral driven full-bridge scrapers, semi-bridge scrapers or central driven.
Sludge scrapers for circular tanks utilize either central drive or peripheral drive. This depends on the process, tank diameter, design and sludge loads. Circular scrapers can be studied through various classifications, they can be classified as central driven fixed bridge scrapers and peripheral driven rotating bridge scrapers with regard to their drive. The length of a rotating bridge scraper can be equal to the basin diameter or a fraction of the basin diameter. The solid load of the treatment plant determines the method of sludge disposal. The accumulated sludge at the bottom can either be scraped into the sludge funnel or be pumped to the pipeline of the central structure by suction pipes. Numerous options can be proposed for both methods.
Our supplying partners have standardized their manufacturing models for using modern efficient methods to ensure high-quality products which our clients expect. The design life is targeted above 40 years. A strong, rigid and torsion-resistant bridge can handle high sludge loads. Steel quality below water is normally AISI304 stainless steel. Motored gears, bearings are supplied by us which are coated according to the customer requirements. Carbon steel driveshafts are anti-corrosion treated. Our full-bridge and semi-bridge rotating sludge scrapers are of latticework design with tubular vertical supports which are welded or bolted to horizontal beams supported from the bridge, angled scraper blades are fitted for bottom scraping to remove sludge from the entire floor to the sludge pit in the center of the tank. Like other options, the units are equipped with surface sludge blades that transport floating sludge to a sludge cone. The floating sludge scraper blades are assembled below the bridge that rotates. The peripheral driven rotating sludge scrapers can be designed with siphon pumping (also referred to as airlift pumps) as an option or with submersible pumps.
They can be used at wastewater treatment plants, industrial wastewater treatment plants, pulp & paper mills, etc. to remove settled sludge from the clarification tank floors.