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Sumi-Thickener is a space-saving high-speed coagulation system, and more than 170 Sumi-Thickener units have been installed. Because of its structural features described below, Sumi-Thickener is operable under higher surface loading than ordinary coagulation systems. The features include: 1) good flocculation for excellent sedimentation, achieved through the installation of a mixing chamber inside the tank and polymer coagulant dosing at several points; 2) a uniformly distributed supply of raw wastewater to the tank using a rotating distributor; and 3) effective utilization of the surface area through a uniform upward stream formed inside the tank. In addition, the formation of a blanket zone increases the clarity of the treated water depending on the type of raw wastewater used. Recent representative applications of Sumi-Thickener include rainwater drainage, activated sludge treatment using the Sumi-Sludge system, the diversion of water (turbidity removal from river water), and solid recovery by coagulation and thickening.
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