Circular clarifier PTA series

with scraper bridge

PTA Peripheral Traction Clarifiers are used to remove biological sludge and floating particles in circular primary and secondary settling tanks in both municipal and industrial waste water treatment plants. PTA Peripheral Traction Clarifiers are used to suck biological sludge and remove floating particles in circular-type primary and secondary settling tanks in both municipal and industrial waste water treatment plants. PTA Peripheral Traction Clarifiers are composed of a movable truck lying in the centre on a rotating central support and at the periphery on a traction trolley. The PTA Clarifier is operated by a gearbox connected to a slip ring placed in the central support. Waste water enters the concrete tank through a central cylinder which spreads the liquid. Sludge settles on the tank bottom while light particles and scum float to the surface. Thanks to the slow movement of the truck special syphon pipes equipped with scraper blades suck the settled sludge. The syphon pipes are adjusted by means of telescopic valves installed on the walkway. Floating particles are collected by a surface scraper and conveyed into the scum-box. Clean water flows through Thomson profile weirs into the peripheral launder.