Abstract: The Multilayer Energy Dissipating Inlet Column (MEDIC) in a center-feed clarifier consists of a plurality of perforated and concentric columns and a circular cover, which closes the bottom of the multilayer column. In the wall of each perforated column many flow inlet ports are mounted. The layout of the flow inlet ports between any two adjacent perforated columns is staggered to create a puzzled flow path and flow impingement among the layers of MEDIC. The strong influent jet due to the small inifluent area in a center-feed clarifier continuously impinges with the multilayer perforated columns one after another one. The resistance created by the multiple perforated columns slows down the influent jet and evenly distributes it among all of the inlet ports in the wall of the most outside column. The ability of MEDIC to confine the turbulence entering into clarifiers effectively lowers the dispersed sludge blanket in clarifiers and increases their capacity.

Abstract: The Multilayer Energy Dissipating Inlet Column (MEDIC) in a center-feed clarifier consists of a plurality of perforated and concentric columns and a circular cover, which closes the bottom of the multilayer column. In the wall of each perforated column many flow inlet ports are mounted. The layout of the flow inlet ports between any two adjacent perforated columns is staggered to create a puzzled flow path and flow impingement among the layers of MEDIC. The strong influent jet due to the small influent area in a center-feed clarifier continuously impinges with the multilayer perforated columns one after another one. The resistance created by the multiple perforated columns slows down the influent jet and evenly distributes it among all of the inlet ports in the wall of the most outside column. The ability of MEDIC to confine the turbulence entering into clarifiers effectively lowers the dispersed sludge blanket in clarifiers and increases their capacity.

Abstract: The Multiple Stationary Sludge Draw-Off Tubes consists of multiple sludge collection tubes oriented along the tangential direction at different radii, several sludge transfer tubes going along the radial direction, a central connection ring located on the clarifier center and a sludge suction driving force. At the downstream end of each sludge transport tube, a valve is installed to allow the system to control flows from different sludge transfer tubes. Small orifices are distributed along the tangential direction on the each sludge collection tubes. The sludge on the tank bottom is sucked into sludge collection tubes through many small orifices and transferred in to center collection ring. The sludge draw-off facility described here can be used to cover the entire clarifier tank bottom, thus the sludge can be directly drawn-off from where solids settled rather than be collected to the center hopper and then moved out.