SETTLING TANK SCRAPER BRIDGE

The settling tank scraper is mounted in a circular tank or clarifier for sedimentation that has a conical bottom and upward flow.

The water to be treated enters through the central distribution cylinder.

The solids settle at the bottom, where rotating scraper mechanisms are operating, with bars and tubes which in turn are anchored to the beams of the bridge that has a central bearing and peripheral traction. Thus the settled material is guided from the periphery until it reaches the central part of the tank, to be evacuated from there by means of a pump.

The clarified water flows out of the top of the tank through a triangular notched weir, Thompson profile.

All floating material on the surface stays away from the weir edge by means of a surface sweeping mechanism that traps and guides the floating material towards a collecting tank or deposit, to later flow out by gravitation. The settled sludge at the bottom of the tank is transferred by pumping to the biological tank and alternatively to the digester.